Ensure that setConfig uses latest functionality (#6302)

This package provide customizable TCP net.Listener with various
performance-related options:

 * SO_REUSEPORT. This option allows linear scaling server performance
   on multi-CPU servers.
   See https://www.nginx.com/blog/socket-sharding-nginx-release-1-9-1/ for details.
 * TCP_DEFER_ACCEPT. This option expects the server reads from the accepted
   connection before writing to them.
 * TCP_FASTOPEN. See https://lwn.net/Articles/508865/ for details.

.gitignore

@@ -22,3 +22,4 @@ parts/
 prime/
 stage/
 .sia_temp/
+config.json

.travis.yml

@@ -8,27 +8,23 @@ dist: trusty
 
 language: go
 
-os:
-- linux
-
-env:
-- ARCH=x86_64
+matrix:
+  include:
+    - os: linux
+      env:
+        - ARCH=x86_64
+      go: 1.10.1
+      script:
+        - make
+        - diff -au <(gofmt -s -d cmd) <(printf "")
+        - diff -au <(gofmt -s -d pkg) <(printf "")
+        - make test GOFLAGS="-timeout 15m -race -v"
+        - make coverage
+        - node --version
+        - cd browser && yarn && yarn test && cd ..
 
 before_install:
 - nvm install stable
 
-script:
-## Run all the tests
-- make
-- diff -au <(gofmt -s -d cmd) <(printf "")
-- diff -au <(gofmt -s -d pkg) <(printf "")
-- make test GOFLAGS="-timeout 15m -race -v"
-- make coverage
-- node --version
-- cd browser && yarn && yarn test && cd ..
-
 after_success:
 - bash <(curl -s https://codecov.io/bash)
-
-go:
-- '1.10.1'

Makefile

@@ -42,17 +42,19 @@ ineffassign:
 
 cyclo:
 	@echo "Running $@"
-	@${GOPATH}/bin/gocyclo -over 100 cmd
-	@${GOPATH}/bin/gocyclo -over 100 pkg
+	@${GOPATH}/bin/gocyclo -over 200 cmd
+	@${GOPATH}/bin/gocyclo -over 200 pkg
 
 deadcode:
 	@echo "Running $@"
 	@${GOPATH}/bin/deadcode -test $(shell go list ./...) || true
 
 spelling:
-	@${GOPATH}/bin/misspell -error `find cmd/`
-	@${GOPATH}/bin/misspell -error `find pkg/`
-	@${GOPATH}/bin/misspell -error `find docs/`
+	@${GOPATH}/bin/misspell -locale US -error `find cmd/`
+	@${GOPATH}/bin/misspell -locale US -error `find pkg/`
+	@${GOPATH}/bin/misspell -locale US -error `find docs/`
+	@${GOPATH}/bin/misspell -locale US -error `find buildscripts/`
+	@${GOPATH}/bin/misspell -locale US -error `find dockerscripts/`
 
 # Builds minio, runs the verifiers then runs the tests.
 check: test
@@ -89,7 +91,7 @@ pkg-list:
 # Builds minio and installs it to $GOPATH/bin.
 install: build
 	@echo "Installing minio binary to '$(GOPATH)/bin/minio'"
-	@cp $(PWD)/minio $(GOPATH)/bin/minio
+	@mkdir -p $(GOPATH)/bin && cp $(PWD)/minio $(GOPATH)/bin/minio
 	@echo "Installation successful. To learn more, try \"minio --help\"."
 
 clean:

browser/app/js/browser/Login.js

@@ -25,14 +25,35 @@ import web from "../web"
 import { Redirect } from "react-router-dom"
 
 export class Login extends React.Component {
+  constructor(props) {
+    super(props)
+    this.state = {
+      accessKey: "",
+      secretKey: ""
+    }
+  }
+
+  // Handle field changes
+  accessKeyChange(e) {
+    this.setState({
+      accessKey: e.target.value
+    })
+  }
+
+  secretKeyChange(e) {
+    this.setState({
+      secretKey: e.target.value
+    })
+  }
+
   handleSubmit(event) {
     event.preventDefault()
     const { showAlert, history } = this.props
     let message = ""
-    if (!document.getElementById("accessKey").value) {
+    if (this.state.accessKey === "") {
       message = "Access Key cannot be empty"
     }
-    if (!document.getElementById("secretKey").value) {
+    if (this.state.secretKey === "") {
       message = "Secret Key cannot be empty"
     }
     if (message) {
@@ -41,8 +62,8 @@ export class Login extends React.Component {
     }
     web
       .Login({
-        username: document.getElementById("accessKey").value,
-        password: document.getElementById("secretKey").value
+        username: this.state.accessKey,
+        password: this.state.secretKey
       })
       .then(res => {
         history.push("/")
@@ -77,6 +98,8 @@ export class Login extends React.Component {
         <div className="l-wrap">
           <form onSubmit={this.handleSubmit.bind(this)}>
             <InputGroup
+              value={this.state.accessKey}
+              onChange={this.accessKeyChange.bind(this)}
               className="ig-dark"
               label="Access Key"
               id="accessKey"
@@ -87,6 +110,8 @@ export class Login extends React.Component {
               autoComplete="username"
             />
             <InputGroup
+              value={this.state.secretKey}
+              onChange={this.secretKeyChange.bind(this)}
               className="ig-dark"
               label="Secret Key"
               id="secretKey"

browser/app/js/browser/__tests__/Login.test.js

@@ -60,20 +60,25 @@ describe("Login", () => {
         alert={{ show: false, type: "danger"}}
         showAlert={showAlertMock}
         clearAlert={clearAlertMock}
-      />,
-      { attachTo: document.body }
+      />
     )
     // case where both keys are empty - displays the second warning
     wrapper.find("form").simulate("submit")
     expect(showAlertMock).toHaveBeenCalledWith("danger", "Secret Key cannot be empty")
 
     // case where access key is empty
-    document.getElementById("secretKey").value = "secretKey"
+    wrapper.setState({
+      accessKey: "",
+      secretKey: "secretKey"
+    })
     wrapper.find("form").simulate("submit")
     expect(showAlertMock).toHaveBeenCalledWith("danger", "Access Key cannot be empty")
 
     // case where secret key is empty
-    document.getElementById("accessKey").value = "accessKey"
+    wrapper.setState({
+      accessKey: "accessKey",
+      secretKey: ""
+    })
     wrapper.find("form").simulate("submit")
     expect(showAlertMock).toHaveBeenCalledWith("danger", "Secret Key cannot be empty")
   })
@@ -85,11 +90,12 @@ describe("Login", () => {
         alert={{ show: false, type: "danger"}}
         showAlert={showAlertMock}
         clearAlert={clearAlertMock}
-      />,
-      { attachTo: document.body }
+      />
     )
-    document.getElementById("accessKey").value = "accessKey"
-    document.getElementById("secretKey").value = "secretKey"
+    wrapper.setState({
+      accessKey: "accessKey",
+      secretKey: "secretKey"
+    })
     wrapper.find("form").simulate("submit")
     expect(web.Login).toHaveBeenCalledWith({
       "username": "accessKey", 

browser/app/js/objects/ObjectActions.js

@@ -57,7 +57,7 @@ export class ObjectActions extends React.Component {
     })
   }
   render() {
-    const { object, showShareObjectModal } = this.props
+    const { object, showShareObjectModal, shareObjectName } = this.props
     return (
       <Dropdown id={`obj-actions-${object.name}`}>
         <Dropdown.Toggle noCaret className="fia-toggle" />
@@ -77,7 +77,8 @@ export class ObjectActions extends React.Component {
             <i className="fa fa-trash" />
           </a>
         </Dropdown.Menu>
-        {showShareObjectModal && <ShareObjectModal object={object} />}
+        {(showShareObjectModal && shareObjectName === object.name) &&
+          <ShareObjectModal object={object} />}
         {this.state.showDeleteConfirmation && (
           <DeleteObjectConfirmModal
             deleteObject={this.deleteObject.bind(this)}
@@ -92,7 +93,8 @@ export class ObjectActions extends React.Component {
 const mapStateToProps = (state, ownProps) => {
   return {
     object: ownProps.object,
-    showShareObjectModal: state.objects.shareObject.show
+    showShareObjectModal: state.objects.shareObject.show,
+    shareObjectName: state.objects.shareObject.object
   }
 }
 

browser/app/js/objects/__tests__/ObjectActions.test.js

@@ -88,8 +88,21 @@ describe("ObjectActions", () => {
         object={{ name: "obj1" }}
         currentPrefix={"pre1/"}
         showShareObjectModal={true}
+        shareObjectName={"obj1"}
       />
     )
     expect(wrapper.find("Connect(ShareObjectModal)").length).toBe(1)
   })
+
+  it("shouldn't render ShareObjectModal when the names of the objects don't match", () => {
+    const wrapper = shallow(
+      <ObjectActions
+        object={{ name: "obj1" }}
+        currentPrefix={"pre1/"}
+        showShareObjectModal={true}
+        shareObjectName={"obj2"}
+      />
+    )
+    expect(wrapper.find("Connect(ShareObjectModal)").length).toBe(0)
+  })
 })

browser/app/less/inc/list.less

@@ -100,6 +100,12 @@ div.fesl-row {
         }
     }
 
+    .fesl-item-name {
+        a {
+            cursor: default;
+        }
+    }
+
     /*--------------------------
         Icons
     ----------------------------*/

browser/build.js

@@ -70,9 +70,9 @@ async.waterfall([
       commitId = stdout.replace('\n', '')
       if (commitId.length !== 40) throw new Error('commitId invalid : ' + commitId)
       assetsFileName = 'ui-assets.go';
-      var cmd = 'go-bindata-assetfs -pkg browser -nocompress=true production/...'
+      var cmd = 'go-bindata-assetfs -o bindata_assetfs.go -pkg browser -nocompress=true production/...'
       if (!isProduction) {
-        cmd = 'go-bindata-assetfs -pkg browser -nocompress=true dev/...'
+        cmd = 'go-bindata-assetfs -o bindata_assetfs.go -pkg browser -nocompress=true dev/...'
       }
       console.log('Running', cmd)
       exec(cmd, cb)

buildscripts/checkdeps.sh

@@ -34,7 +34,7 @@ _init() {
 
 ## FIXME:
 ## In OSX, 'readlink -f' option does not exist, hence
-## we have our own readlink -f behaviour here.
+## we have our own readlink -f behavior here.
 ## Once OSX has the option, below function is good enough.
 ## 
 ## readlink() {
@@ -89,11 +89,11 @@ check_minimum_version() {
 
 assert_is_supported_arch() {
     case "${ARCH}" in
-        x86_64 | amd64 | aarch64 | arm* )
+        x86_64 | amd64 | aarch64 | ppc64le | arm* | s390x )
             return
             ;;
         *)
-            echo "Arch '${ARCH}' is not supported. Supported Arch: [x86_64, amd64, aarch64, arm*]"
+            echo "Arch '${ARCH}' is not supported. Supported Arch: [x86_64, amd64, aarch64, ppc64le, arm*, s390x]"
             exit 1
     esac
 }

buildscripts/gen-ldflags.go

@@ -33,6 +33,7 @@ func genLDFlags(version string) string {
 	ldflagsStr += " -X github.com/minio/minio/cmd.CommitID=" + commitID()
 	ldflagsStr += " -X github.com/minio/minio/cmd.ShortCommitID=" + commitID()[:12]
 	ldflagsStr += " -X github.com/minio/minio/cmd.GOPATH=" + os.Getenv("GOPATH")
+	ldflagsStr += " -X github.com/minio/minio/cmd.GOROOT=" + os.Getenv("GOROOT")
 	return ldflagsStr
 }
 

buildscripts/verify-build.sh

@@ -71,6 +71,8 @@ function start_minio_erasure_sets()
 function start_minio_dist_erasure_sets()
 {
     declare -a minio_pids
+    export MINIO_ACCESS_KEY=$ACCESS_KEY
+    export MINIO_SECRET_KEY=$SECRET_KEY
     "${MINIO[@]}" server --address=:9000 "http://127.0.0.1:9000${WORK_DIR}/dist-disk-sets1" "http://127.0.0.1:9001${WORK_DIR}/dist-disk-sets2" "http://127.0.0.1:9002${WORK_DIR}/dist-disk-sets3" "http://127.0.0.1:9003${WORK_DIR}/dist-disk-sets4" "http://127.0.0.1:9004${WORK_DIR}/dist-disk-sets5" "http://127.0.0.1:9005${WORK_DIR}/dist-disk-sets6" "http://127.0.0.1:9006${WORK_DIR}/dist-disk-sets7" "http://127.0.0.1:9007${WORK_DIR}/dist-disk-sets8" "http://127.0.0.1:9008${WORK_DIR}/dist-disk-sets9" "http://127.0.0.1:9009${WORK_DIR}/dist-disk-sets10" "http://127.0.0.1:9000${WORK_DIR}/dist-disk-sets11" "http://127.0.0.1:9001${WORK_DIR}/dist-disk-sets12" "http://127.0.0.1:9002${WORK_DIR}/dist-disk-sets13" "http://127.0.0.1:9003${WORK_DIR}/dist-disk-sets14" "http://127.0.0.1:9004${WORK_DIR}/dist-disk-sets15" "http://127.0.0.1:9005${WORK_DIR}/dist-disk-sets16" "http://127.0.0.1:9006${WORK_DIR}/dist-disk-sets17" "http://127.0.0.1:9007${WORK_DIR}/dist-disk-sets18" "http://127.0.0.1:9008${WORK_DIR}/dist-disk-sets19" "http://127.0.0.1:9009${WORK_DIR}/dist-disk-sets20" >"$WORK_DIR/dist-minio-9000.log" 2>&1 &
     minio_pids[0]=$!
     "${MINIO[@]}" server --address=:9001 "http://127.0.0.1:9000${WORK_DIR}/dist-disk-sets1" "http://127.0.0.1:9001${WORK_DIR}/dist-disk-sets2" "http://127.0.0.1:9002${WORK_DIR}/dist-disk-sets3" "http://127.0.0.1:9003${WORK_DIR}/dist-disk-sets4" "http://127.0.0.1:9004${WORK_DIR}/dist-disk-sets5" "http://127.0.0.1:9005${WORK_DIR}/dist-disk-sets6" "http://127.0.0.1:9006${WORK_DIR}/dist-disk-sets7" "http://127.0.0.1:9007${WORK_DIR}/dist-disk-sets8" "http://127.0.0.1:9008${WORK_DIR}/dist-disk-sets9" "http://127.0.0.1:9009${WORK_DIR}/dist-disk-sets10" "http://127.0.0.1:9000${WORK_DIR}/dist-disk-sets11" "http://127.0.0.1:9001${WORK_DIR}/dist-disk-sets12" "http://127.0.0.1:9002${WORK_DIR}/dist-disk-sets13" "http://127.0.0.1:9003${WORK_DIR}/dist-disk-sets14" "http://127.0.0.1:9004${WORK_DIR}/dist-disk-sets15" "http://127.0.0.1:9005${WORK_DIR}/dist-disk-sets16" "http://127.0.0.1:9006${WORK_DIR}/dist-disk-sets17" "http://127.0.0.1:9007${WORK_DIR}/dist-disk-sets18" "http://127.0.0.1:9008${WORK_DIR}/dist-disk-sets19" "http://127.0.0.1:9009${WORK_DIR}/dist-disk-sets20" >"$WORK_DIR/dist-minio-9001.log" 2>&1 &
@@ -99,6 +101,8 @@ function start_minio_dist_erasure_sets()
 function start_minio_dist_erasure()
 {
     declare -a minio_pids
+    export MINIO_ACCESS_KEY=$ACCESS_KEY
+    export MINIO_SECRET_KEY=$SECRET_KEY
     "${MINIO[@]}" server --address=:9000 "http://127.0.0.1:9000${WORK_DIR}/dist-disk1" "http://127.0.0.1:9001${WORK_DIR}/dist-disk2" "http://127.0.0.1:9002${WORK_DIR}/dist-disk3" "http://127.0.0.1:9003${WORK_DIR}/dist-disk4" >"$WORK_DIR/dist-minio-9000.log" 2>&1 &
     minio_pids[0]=$!
     "${MINIO[@]}" server --address=:9001 "http://127.0.0.1:9000${WORK_DIR}/dist-disk1" "http://127.0.0.1:9001${WORK_DIR}/dist-disk2" "http://127.0.0.1:9002${WORK_DIR}/dist-disk3" "http://127.0.0.1:9003${WORK_DIR}/dist-disk4" >"$WORK_DIR/dist-minio-9001.log" 2>&1 &

cmd/acl-handlers.go

@@ -54,7 +54,7 @@ type accessControlPolicy struct {
 // This operation uses the ACL
 // subresource to return the ACL of a specified bucket.
 func (api objectAPIHandlers) GetBucketACLHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "GetBucketACL")
+	ctx := newContext(r, w, "GetBucketACL")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -101,7 +101,7 @@ func (api objectAPIHandlers) GetBucketACLHandler(w http.ResponseWriter, r *http.
 // This operation uses the ACL
 // subresource to return the ACL of a specified object.
 func (api objectAPIHandlers) GetObjectACLHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "GetObjectACL")
+	ctx := newContext(r, w, "GetObjectACL")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]

cmd/admin-handlers.go

@@ -21,10 +21,8 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
-	"fmt"
 	"io"
 	"net/http"
-	"net/url"
 	"sync"
 	"time"
 
@@ -37,8 +35,6 @@ import (
 )
 
 const (
-	minioConfigTmpFormat = "config-%s.json"
-
 	maxConfigJSONSize = 256 * 1024 // 256KiB
 )
 
@@ -47,11 +43,10 @@ type mgmtQueryKey string
 
 // Only valid query params for mgmt admin APIs.
 const (
-	mgmtBucket        mgmtQueryKey = "bucket"
-	mgmtPrefix        mgmtQueryKey = "prefix"
-	mgmtLockOlderThan mgmtQueryKey = "older-than"
-	mgmtClientToken   mgmtQueryKey = "clientToken"
-	mgmtForceStart    mgmtQueryKey = "forceStart"
+	mgmtBucket      mgmtQueryKey = "bucket"
+	mgmtPrefix      mgmtQueryKey = "prefix"
+	mgmtClientToken mgmtQueryKey = "clientToken"
+	mgmtForceStart  mgmtQueryKey = "forceStart"
 )
 
 var (
@@ -275,133 +270,6 @@ func (a adminAPIHandlers) ServerInfoHandler(w http.ResponseWriter, r *http.Reque
 	writeSuccessResponseJSON(w, jsonBytes)
 }
 
-// validateLockQueryParams - Validates query params for list/clear
-// locks management APIs.
-func validateLockQueryParams(vars url.Values) (string, string, time.Duration,
-	APIErrorCode) {
-
-	bucket := vars.Get(string(mgmtBucket))
-	prefix := vars.Get(string(mgmtPrefix))
-	olderThanStr := vars.Get(string(mgmtLockOlderThan))
-
-	// N B empty bucket name is invalid
-	if !IsValidBucketName(bucket) {
-		return "", "", time.Duration(0), ErrInvalidBucketName
-	}
-	// empty prefix is valid.
-	if !IsValidObjectPrefix(prefix) {
-		return "", "", time.Duration(0), ErrInvalidObjectName
-	}
-
-	// If older-than parameter was empty then set it to 0s to list
-	// all locks older than now.
-	if olderThanStr == "" {
-		olderThanStr = "0s"
-	}
-	duration, err := time.ParseDuration(olderThanStr)
-	if err != nil {
-		logger.LogIf(context.Background(), err)
-		return "", "", time.Duration(0), ErrInvalidDuration
-	}
-
-	return bucket, prefix, duration, ErrNone
-}
-
-// ListLocksHandler - GET /minio/admin/v1/locks?bucket=mybucket&prefix=myprefix&older-than=10s
-// - bucket is a mandatory query parameter
-// - prefix and older-than are optional query parameters
-// ---------
-// Lists locks held on a given bucket, prefix and duration it was held for.
-func (a adminAPIHandlers) ListLocksHandler(w http.ResponseWriter, r *http.Request) {
-
-	adminAPIErr := checkAdminRequestAuthType(r, "")
-	if adminAPIErr != ErrNone {
-		writeErrorResponseJSON(w, adminAPIErr, r.URL)
-		return
-	}
-
-	vars := r.URL.Query()
-	bucket, prefix, duration, adminAPIErr := validateLockQueryParams(vars)
-	if adminAPIErr != ErrNone {
-		writeErrorResponseJSON(w, adminAPIErr, r.URL)
-		return
-	}
-
-	// Fetch lock information of locks matching bucket/prefix that
-	// are available for longer than duration.
-	volLocks, err := listPeerLocksInfo(globalAdminPeers, bucket, prefix,
-		duration)
-	if err != nil {
-		writeErrorResponseJSON(w, ErrInternalError, r.URL)
-		logger.LogIf(context.Background(), err)
-		return
-	}
-
-	// Marshal list of locks as json.
-	jsonBytes, err := json.Marshal(volLocks)
-	if err != nil {
-		writeErrorResponseJSON(w, ErrInternalError, r.URL)
-		logger.LogIf(context.Background(), err)
-		return
-	}
-
-	// Reply with list of locks held on bucket, matching prefix
-	// held longer than duration supplied, as json.
-	writeSuccessResponseJSON(w, jsonBytes)
-}
-
-// ClearLocksHandler - DELETE /minio/admin/v1/locks?bucket=mybucket&prefix=myprefix&duration=duration
-// - bucket is a mandatory query parameter
-// - prefix and older-than are optional query parameters
-// ---------
-// Clear locks held on a given bucket, prefix and duration it was held for.
-func (a adminAPIHandlers) ClearLocksHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "ClearLocks")
-
-	// Get object layer instance.
-	objLayer := newObjectLayerFn()
-	if objLayer == nil {
-		writeErrorResponseJSON(w, ErrServerNotInitialized, r.URL)
-		return
-	}
-
-	adminAPIErr := checkAdminRequestAuthType(r, "")
-	if adminAPIErr != ErrNone {
-		writeErrorResponseJSON(w, adminAPIErr, r.URL)
-		return
-	}
-
-	vars := r.URL.Query()
-	bucket, prefix, duration, adminAPIErr := validateLockQueryParams(vars)
-	if adminAPIErr != ErrNone {
-		writeErrorResponseJSON(w, adminAPIErr, r.URL)
-		return
-	}
-
-	// Fetch lock information of locks matching bucket/prefix that
-	// are held for longer than duration.
-	volLocks, err := listPeerLocksInfo(globalAdminPeers, bucket, prefix,
-		duration)
-	if err != nil {
-		writeErrorResponseJSON(w, ErrInternalError, r.URL)
-		logger.LogIf(ctx, err)
-		return
-	}
-
-	// Marshal list of locks as json.
-	jsonBytes, err := json.Marshal(volLocks)
-	if err != nil {
-		writeErrorResponseJSON(w, ErrInternalError, r.URL)
-		logger.LogIf(ctx, err)
-		return
-	}
-
-	objLayer.ClearLocks(ctx, volLocks)
-
-	// Reply with list of locks cleared, as json.
-	writeSuccessResponseJSON(w, jsonBytes)
-}
-
 // extractHealInitParams - Validates params for heal init API.
 func extractHealInitParams(r *http.Request) (bucket, objPrefix string,
 	hs madmin.HealOpts, clientToken string, forceStart bool,
@@ -464,7 +332,7 @@ func extractHealInitParams(r *http.Request) (bucket, objPrefix string,
 // sequence. However, if the force-start flag is provided, the server
 // aborts the running heal sequence and starts a new one.
 func (a adminAPIHandlers) HealHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "Heal")
+	ctx := newContext(r, w, "Heal")
 
 	// Get object layer instance.
 	objLayer := newObjectLayerFn()
@@ -474,7 +342,7 @@ func (a adminAPIHandlers) HealHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Validate request signature.
-	adminAPIErr := checkAdminRequestAuthType(r, globalServerConfig.GetRegion())
+	adminAPIErr := checkAdminRequestAuthType(r, "")
 	if adminAPIErr != ErrNone {
 		writeErrorResponseJSON(w, adminAPIErr, r.URL)
 		return
@@ -570,6 +438,15 @@ func (a adminAPIHandlers) HealHandler(w http.ResponseWriter, r *http.Request) {
 // GetConfigHandler - GET /minio/admin/v1/config
 // Get config.json of this minio setup.
 func (a adminAPIHandlers) GetConfigHandler(w http.ResponseWriter, r *http.Request) {
+	ctx := newContext(r, w, "GetConfigHandler")
+
+	// Get current object layer instance.
+	objectAPI := newObjectLayerFn()
+	if objectAPI == nil {
+		writeErrorResponseJSON(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
 	// Validate request signature.
 	adminAPIErr := checkAdminRequestAuthType(r, "")
 	if adminAPIErr != ErrNone {
@@ -577,26 +454,28 @@ func (a adminAPIHandlers) GetConfigHandler(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	// Take a read lock on minio/config.json. NB minio is a
-	// reserved bucket name and wouldn't conflict with normal
-	// object operations.
-	configLock := globalNSMutex.NewNSLock(minioReservedBucket, minioConfigFile)
-	if configLock.GetRLock(globalObjectTimeout) != nil {
-		writeErrorResponseJSON(w, ErrOperationTimedOut, r.URL)
-		return
-	}
-	defer configLock.RUnlock()
-
-	// Get config.json - in distributed mode, the configuration
-	// occurring on a quorum of the servers is returned.
-	configBytes, err := getPeerConfig(globalAdminPeers)
+	config, err := readServerConfig(ctx, objectAPI)
 	if err != nil {
-		logger.LogIf(context.Background(), err)
 		writeErrorResponseJSON(w, toAdminAPIErrCode(err), r.URL)
 		return
 	}
 
-	writeSuccessResponseJSON(w, configBytes)
+	configData, err := json.Marshal(config)
+	if err != nil {
+		logger.LogIf(ctx, err)
+		writeErrorResponseJSON(w, toAdminAPIErrCode(err), r.URL)
+		return
+	}
+
+	password := config.GetCredential().SecretKey
+	econfigData, err := madmin.EncryptServerConfigData(password, configData)
+	if err != nil {
+		logger.LogIf(ctx, err)
+		writeErrorResponseJSON(w, toAdminAPIErrCode(err), r.URL)
+		return
+	}
+
+	writeSuccessResponseJSON(w, econfigData)
 }
 
 // toAdminAPIErrCode - converts errXLWriteQuorum error to admin API
@@ -605,65 +484,15 @@ func toAdminAPIErrCode(err error) APIErrorCode {
 	switch err {
 	case errXLWriteQuorum:
 		return ErrAdminConfigNoQuorum
+	default:
+		return toAPIErrorCode(err)
 	}
-	return toAPIErrorCode(err)
-}
-
-// SetConfigResult - represents detailed results of a set-config
-// operation.
-type nodeSummary struct {
-	Name   string `json:"name"`
-	ErrSet bool   `json:"errSet"`
-	ErrMsg string `json:"errMsg"`
-}
-
-type setConfigResult struct {
-	NodeResults []nodeSummary `json:"nodeResults"`
-	Status      bool          `json:"status"`
-}
-
-// writeSetConfigResponse - writes setConfigResult value as json
-// depending on the status.
-func writeSetConfigResponse(w http.ResponseWriter, peers adminPeers,
-	errs []error, status bool, reqURL *url.URL) {
-
-	var nodeResults []nodeSummary
-	// Build nodeResults based on error values received during
-	// set-config operation.
-	for i := range errs {
-		nodeResults = append(nodeResults, nodeSummary{
-			Name:   peers[i].addr,
-			ErrSet: errs[i] != nil,
-			ErrMsg: fmt.Sprintf("%v", errs[i]),
-		})
-
-	}
-
-	result := setConfigResult{
-		Status:      status,
-		NodeResults: nodeResults,
-	}
-
-	// The following elaborate json encoding is to avoid escaping
-	// '<', '>' in <nil>. Note: json.Encoder.Encode() adds a
-	// gratuitous "\n".
-	var resultBuf bytes.Buffer
-	enc := json.NewEncoder(&resultBuf)
-	enc.SetEscapeHTML(false)
-	jsonErr := enc.Encode(result)
-	if jsonErr != nil {
-		writeErrorResponseJSON(w, toAPIErrorCode(jsonErr), reqURL)
-		return
-	}
-
-	writeSuccessResponseJSON(w, resultBuf.Bytes())
-	return
 }
 
 // SetConfigHandler - PUT /minio/admin/v1/config
 func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Request) {
+	ctx := newContext(r, w, "SetConfigHandler")
 
-	ctx := context.Background()
 	// Get current object layer instance.
 	objectAPI := newObjectLayerFn()
 	if objectAPI == nil {
@@ -671,12 +500,6 @@ func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	// Deny if WORM is enabled
-	if globalWORMEnabled {
-		writeErrorResponseJSON(w, ErrMethodNotAllowed, r.URL)
-		return
-	}
-
 	// Validate request signature.
 	adminAPIErr := checkAdminRequestAuthType(r, "")
 	if adminAPIErr != ErrNone {
@@ -698,7 +521,13 @@ func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	configBytes := configBuf[:n]
+	password := globalServerConfig.GetCredential().SecretKey
+	configBytes, err := madmin.DecryptServerConfigData(password, bytes.NewReader(configBuf[:n]))
+	if err != nil {
+		logger.LogIf(ctx, err)
+		writeErrorResponseJSON(w, ErrAdminConfigBadJSON, r.URL)
+		return
+	}
 
 	// Validate JSON provided in the request body: check the
 	// client has not sent JSON objects with duplicate keys.
@@ -712,7 +541,7 @@ func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Reques
 	err = json.Unmarshal(configBytes, &config)
 	if err != nil {
 		logger.LogIf(ctx, err)
-		writeErrorResponseJSON(w, toAPIErrorCode(err), r.URL)
+		writeCustomErrorResponseJSON(w, ErrAdminConfigBadJSON, err.Error(), r.URL)
 		return
 	}
 
@@ -727,53 +556,45 @@ func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Reques
 		}
 	}
 
-	// Write config received from request onto a temporary file on
-	// all nodes.
-	tmpFileName := fmt.Sprintf(minioConfigTmpFormat, mustGetUUID())
-	errs := writeTmpConfigPeers(globalAdminPeers, tmpFileName, configBytes)
-
-	// Check if the operation succeeded in quorum or more nodes.
-	rErr := reduceWriteQuorumErrs(ctx, errs, nil, len(globalAdminPeers)/2+1)
-	if rErr != nil {
-		writeSetConfigResponse(w, globalAdminPeers, errs, false, r.URL)
+	if err = config.Validate(); err != nil {
+		writeCustomErrorResponseJSON(w, ErrAdminConfigBadJSON, err.Error(), r.URL)
 		return
 	}
 
-	// Take a lock on minio/config.json. NB minio is a reserved
-	// bucket name and wouldn't conflict with normal object
-	// operations.
-	configLock := globalNSMutex.NewNSLock(minioReservedBucket, minioConfigFile)
-	if configLock.GetLock(globalObjectTimeout) != nil {
-		writeErrorResponseJSON(w, ErrOperationTimedOut, r.URL)
-		return
-	}
-	defer configLock.Unlock()
-
-	// Rename the temporary config file to config.json
-	errs = commitConfigPeers(globalAdminPeers, tmpFileName)
-	rErr = reduceWriteQuorumErrs(ctx, errs, nil, len(globalAdminPeers)/2+1)
-	if rErr != nil {
-		writeSetConfigResponse(w, globalAdminPeers, errs, false, r.URL)
+	if err = saveServerConfig(objectAPI, &config); err != nil {
+		writeErrorResponseJSON(w, toAdminAPIErrCode(err), r.URL)
 		return
 	}
 
-	// serverMux (cmd/server-mux.go) implements graceful shutdown,
-	// where all listeners are closed and process restart/shutdown
-	// happens after 5s or completion of all ongoing http
-	// requests, whichever is earlier.
-	writeSetConfigResponse(w, globalAdminPeers, errs, true, r.URL)
+	// Reply to the client before restarting minio server.
+	writeSuccessResponseHeadersOnly(w)
 
-	// Restart all node for the modified config to take effect.
 	sendServiceCmd(globalAdminPeers, serviceRestart)
 }
 
-// ConfigCredsHandler - POST /minio/admin/v1/config/credential
+// UpdateCredsHandler - POST /minio/admin/v1/config/credential
 // ----------
 // Update credentials in a minio server. In a distributed setup,
 // update all the servers in the cluster.
 func (a adminAPIHandlers) UpdateCredentialsHandler(w http.ResponseWriter,
 	r *http.Request) {
 
+	ctx := newContext(r, w, "UpdateCredentialsHandler")
+
+	// Get current object layer instance.
+	objectAPI := newObjectLayerFn()
+	if objectAPI == nil {
+		writeErrorResponseJSON(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	// Avoid setting new credentials when they are already passed
+	// by the environment. Deny if WORM is enabled.
+	if globalIsEnvCreds {
+		writeErrorResponseJSON(w, ErrMethodNotAllowed, r.URL)
+		return
+	}
+
 	// Authenticate request
 	adminAPIErr := checkAdminRequestAuthType(r, "")
 	if adminAPIErr != ErrNone {
@@ -781,18 +602,32 @@ func (a adminAPIHandlers) UpdateCredentialsHandler(w http.ResponseWriter,
 		return
 	}
 
-	// Avoid setting new credentials when they are already passed
-	// by the environment. Deny if WORM is enabled.
-	if globalIsEnvCreds || globalWORMEnabled {
-		writeErrorResponseJSON(w, ErrMethodNotAllowed, r.URL)
+	// Read configuration bytes from request body.
+	configBuf := make([]byte, maxConfigJSONSize+1)
+	n, err := io.ReadFull(r.Body, configBuf)
+	if err == nil {
+		// More than maxConfigSize bytes were available
+		writeErrorResponseJSON(w, ErrAdminConfigTooLarge, r.URL)
+		return
+	}
+	if err != io.ErrUnexpectedEOF {
+		logger.LogIf(ctx, err)
+		writeErrorResponseJSON(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	password := globalServerConfig.GetCredential().SecretKey
+	configBytes, err := madmin.DecryptServerConfigData(password, bytes.NewReader(configBuf[:n]))
+	if err != nil {
+		logger.LogIf(ctx, err)
+		writeErrorResponseJSON(w, ErrAdminConfigBadJSON, r.URL)
 		return
 	}
 
 	// Decode request body
 	var req madmin.SetCredsReq
-	err := json.NewDecoder(r.Body).Decode(&req)
-	if err != nil {
-		logger.LogIf(context.Background(), err)
+	if err = json.Unmarshal(configBytes, &req); err != nil {
+		logger.LogIf(ctx, err)
 		writeErrorResponseJSON(w, ErrRequestBodyParse, r.URL)
 		return
 	}
@@ -803,33 +638,25 @@ func (a adminAPIHandlers) UpdateCredentialsHandler(w http.ResponseWriter,
 		return
 	}
 
-	// Take a lock on minio/config.json. Prevents concurrent
-	// config file updates.
-	configLock := globalNSMutex.NewNSLock(minioReservedBucket, minioConfigFile)
-	if configLock.GetLock(globalObjectTimeout) != nil {
-		writeErrorResponseJSON(w, ErrOperationTimedOut, r.URL)
-		return
-	}
-	defer configLock.Unlock()
-
 	// Acquire lock before updating global configuration.
 	globalServerConfigMu.Lock()
 	defer globalServerConfigMu.Unlock()
 
 	// Update local credentials in memory.
 	globalServerConfig.SetCredential(creds)
-	if err = globalServerConfig.Save(); err != nil {
-		writeErrorResponseJSON(w, ErrInternalError, r.URL)
+
+	if err = saveServerConfig(objectAPI, globalServerConfig); err != nil {
+		writeErrorResponseJSON(w, toAdminAPIErrCode(err), r.URL)
 		return
 	}
 
 	// Notify all other Minio peers to update credentials
-	for host, err := range globalNotificationSys.SetCredentials(creds) {
+	for host, err := range globalNotificationSys.LoadCredentials() {
 		reqInfo := (&logger.ReqInfo{}).AppendTags("peerAddress", host.String())
-		ctx := logger.SetReqInfo(context.Background(), reqInfo)
+		ctx := logger.SetReqInfo(ctx, reqInfo)
 		logger.LogIf(ctx, err)
 	}
 
-	// At this stage, the operation is successful, return 200 OK
-	w.WriteHeader(http.StatusOK)
+	// Reply to the client before restarting minio server.
+	writeSuccessResponseHeadersOnly(w)
 }

cmd/admin-handlers_test.go

@@ -26,7 +26,6 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
-	"os"
 	"strings"
 	"testing"
 	"time"
@@ -38,21 +37,39 @@ import (
 
 var (
 	configJSON = []byte(`{
-	"version": "13",
+	"version": "28",
 	"credential": {
 		"accessKey": "minio",
 		"secretKey": "minio123"
 	},
-	"region": "us-west-1",
-	"logger": {
-		"console": {
-			"enable": true,
-			"level": "fatal"
-		},
-		"file": {
-			"enable": false,
-			"fileName": "",
-			"level": ""
+	"region": "",
+	"browser": "on",
+	"worm": "off",
+	"domain": "",
+	"storageclass": {
+		"standard": "",
+		"rrs": ""
+	},
+	"cache": {
+		"drives": [],
+		"expiry": 90,
+		"maxuse": 80,
+		"exclude": []
+	},
+	"kms": {
+		"vault": {
+			"endpoint": "",
+			"auth": {
+				"type": "",
+				"approle": {
+					"id": "",
+					"secret": ""
+				}
+			},
+			"key-id": {
+				"name": "",
+				"version": 0
+			}
 		}
 	},
 	"notify": {
@@ -63,6 +80,7 @@ var (
 				"exchange": "",
 				"routingKey": "",
 				"exchangeType": "",
+				"deliveryMode": 0,
 				"mandatory": false,
 				"immediate": false,
 				"durable": false,
@@ -71,6 +89,47 @@ var (
 				"autoDeleted": false
 			}
 		},
+		"elasticsearch": {
+			"1": {
+				"enable": false,
+				"format": "",
+				"url": "",
+				"index": ""
+			}
+		},
+		"kafka": {
+			"1": {
+				"enable": false,
+				"brokers": null,
+				"topic": ""
+			}
+		},
+		"mqtt": {
+			"1": {
+				"enable": false,
+				"broker": "",
+				"topic": "",
+				"qos": 0,
+				"clientId": "",
+				"username": "",
+				"password": "",
+				"reconnectInterval": 0,
+				"keepAliveInterval": 0
+			}
+		},
+		"mysql": {
+			"1": {
+				"enable": false,
+				"format": "",
+				"dsnString": "",
+				"table": "",
+				"host": "",
+				"port": "",
+				"user": "",
+				"password": "",
+				"database": ""
+			}
+		},
 		"nats": {
 			"1": {
 				"enable": false,
@@ -90,24 +149,10 @@ var (
 				}
 			}
 		},
-		"elasticsearch": {
-			"1": {
-				"enable": false,
-				"url": "",
-				"index": ""
-			}
-		},
-		"redis": {
-			"1": {
-				"enable": false,
-				"address": "",
-				"password": "",
-				"key": ""
-			}
-		},
 		"postgresql": {
 			"1": {
 				"enable": false,
+				"format": "",
 				"connectionString": "",
 				"table": "",
 				"host": "",
@@ -117,11 +162,13 @@ var (
 				"database": ""
 			}
 		},
-		"kafka": {
+		"redis": {
 			"1": {
 				"enable": false,
-				"brokers": null,
-				"topic": ""
+				"format": "",
+				"address": "",
+				"password": "",
+				"key": ""
 			}
 		},
 		"webhook": {
@@ -130,8 +177,20 @@ var (
 				"endpoint": ""
 			}
 		}
-	}
-}`)
+	    },
+	    "logger": {
+		"console": {
+		    "enabled": true
+		},
+		"http": {
+		    "1": {
+			"enabled": false,
+			"endpoint": "http://user:example@localhost:9001/api/endpoint"
+		    }
+		}
+	    }
+
+	}`)
 )
 
 // adminXLTestBed - encapsulates subsystems that need to be setup for
@@ -149,17 +208,17 @@ func prepareAdminXLTestBed() (*adminXLTestBed, error) {
 	// reset global variables to start afresh.
 	resetTestGlobals()
 
-	// Initialize minio server config.
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		return nil, err
-	}
 	// Initializing objectLayer for HealFormatHandler.
 	objLayer, xlDirs, xlErr := initTestXLObjLayer()
 	if xlErr != nil {
 		return nil, xlErr
 	}
 
+	// Initialize minio server config.
+	if err := newTestConfig(globalMinioDefaultRegion, objLayer); err != nil {
+		return nil, err
+	}
+
 	// Initialize boot time
 	globalBootTime = UTCNow()
 
@@ -176,10 +235,7 @@ func prepareAdminXLTestBed() (*adminXLTestBed, error) {
 	// Init global heal state
 	initAllHealState(globalIsXL)
 
-	globalNotificationSys, err = NewNotificationSys(globalServerConfig, globalEndpoints)
-	if err != nil {
-		return nil, err
-	}
+	globalNotificationSys = NewNotificationSys(globalServerConfig, globalEndpoints)
 
 	// Create new policy system.
 	globalPolicySys = NewPolicySys()
@@ -189,17 +245,15 @@ func prepareAdminXLTestBed() (*adminXLTestBed, error) {
 	registerAdminRouter(adminRouter)
 
 	return &adminXLTestBed{
-		configPath: rootPath,
-		xlDirs:     xlDirs,
-		objLayer:   objLayer,
-		router:     adminRouter,
+		xlDirs:   xlDirs,
+		objLayer: objLayer,
+		router:   adminRouter,
 	}, nil
 }
 
 // TearDown - method that resets the test bed for subsequent unit
 // tests to start afresh.
 func (atb *adminXLTestBed) TearDown() {
-	os.RemoveAll(atb.configPath)
 	removeRoots(atb.xlDirs)
 	resetTestGlobals()
 }
@@ -538,8 +592,14 @@ func TestServiceSetCreds(t *testing.T) {
 		if err != nil {
 			t.Fatalf("JSONify err: %v", err)
 		}
+
+		ebody, err := madmin.EncryptServerConfigData(credentials.SecretKey, body)
+		if err != nil {
+			t.Fatal(err)
+		}
+
 		// Construct setCreds request
-		req, err := getServiceCmdRequest(setCreds, credentials, body)
+		req, err := getServiceCmdRequest(setCreds, credentials, ebody)
 		if err != nil {
 			t.Fatalf("Failed to build service status request %v", err)
 		}
@@ -570,193 +630,6 @@ func TestServiceSetCreds(t *testing.T) {
 	}
 }
 
-// mkLockQueryVal - helper function to build lock query param.
-func mkLockQueryVal(bucket, prefix, durationStr string) url.Values {
-	qVal := url.Values{}
-	qVal.Set(string(mgmtBucket), bucket)
-	qVal.Set(string(mgmtPrefix), prefix)
-	qVal.Set(string(mgmtLockOlderThan), durationStr)
-	return qVal
-}
-
-// Test for locks list management REST API.
-func TestListLocksHandler(t *testing.T) {
-	adminTestBed, err := prepareAdminXLTestBed()
-	if err != nil {
-		t.Fatal("Failed to initialize a single node XL backend for admin handler tests.")
-	}
-	defer adminTestBed.TearDown()
-
-	// Initialize admin peers to make admin RPC calls.
-	globalMinioAddr = "127.0.0.1:9000"
-	initGlobalAdminPeers(mustGetNewEndpointList("http://127.0.0.1:9000/d1"))
-
-	testCases := []struct {
-		bucket         string
-		prefix         string
-		duration       string
-		expectedStatus int
-	}{
-		// Test 1 - valid testcase
-		{
-			bucket:         "mybucket",
-			prefix:         "myobject",
-			duration:       "1s",
-			expectedStatus: http.StatusOK,
-		},
-		// Test 2 - invalid duration
-		{
-			bucket:         "mybucket",
-			prefix:         "myprefix",
-			duration:       "invalidDuration",
-			expectedStatus: http.StatusBadRequest,
-		},
-		// Test 3 - invalid bucket name
-		{
-			bucket:         `invalid\\Bucket`,
-			prefix:         "myprefix",
-			duration:       "1h",
-			expectedStatus: http.StatusBadRequest,
-		},
-		// Test 4 - invalid prefix
-		{
-			bucket:         "mybucket",
-			prefix:         `invalid\\Prefix`,
-			duration:       "1h",
-			expectedStatus: http.StatusBadRequest,
-		},
-	}
-
-	for i, test := range testCases {
-		queryVal := mkLockQueryVal(test.bucket, test.prefix, test.duration)
-		req, err := newTestRequest("GET", "/minio/admin/v1/locks?"+queryVal.Encode(), 0, nil)
-		if err != nil {
-			t.Fatalf("Test %d - Failed to construct list locks request - %v", i+1, err)
-		}
-
-		cred := globalServerConfig.GetCredential()
-		err = signRequestV4(req, cred.AccessKey, cred.SecretKey)
-		if err != nil {
-			t.Fatalf("Test %d - Failed to sign list locks request - %v", i+1, err)
-		}
-		rec := httptest.NewRecorder()
-		adminTestBed.router.ServeHTTP(rec, req)
-		if test.expectedStatus != rec.Code {
-			t.Errorf("Test %d - Expected HTTP status code %d but received %d", i+1, test.expectedStatus, rec.Code)
-		}
-	}
-}
-
-// Test for locks clear management REST API.
-func TestClearLocksHandler(t *testing.T) {
-	adminTestBed, err := prepareAdminXLTestBed()
-	if err != nil {
-		t.Fatal("Failed to initialize a single node XL backend for admin handler tests.")
-	}
-	defer adminTestBed.TearDown()
-
-	// Initialize admin peers to make admin RPC calls.
-	initGlobalAdminPeers(mustGetNewEndpointList("http://127.0.0.1:9000/d1"))
-
-	testCases := []struct {
-		bucket         string
-		prefix         string
-		duration       string
-		expectedStatus int
-	}{
-		// Test 1 - valid testcase
-		{
-			bucket:         "mybucket",
-			prefix:         "myobject",
-			duration:       "1s",
-			expectedStatus: http.StatusOK,
-		},
-		// Test 2 - invalid duration
-		{
-			bucket:         "mybucket",
-			prefix:         "myprefix",
-			duration:       "invalidDuration",
-			expectedStatus: http.StatusBadRequest,
-		},
-		// Test 3 - invalid bucket name
-		{
-			bucket:         `invalid\\Bucket`,
-			prefix:         "myprefix",
-			duration:       "1h",
-			expectedStatus: http.StatusBadRequest,
-		},
-		// Test 4 - invalid prefix
-		{
-			bucket:         "mybucket",
-			prefix:         `invalid\\Prefix`,
-			duration:       "1h",
-			expectedStatus: http.StatusBadRequest,
-		},
-	}
-
-	for i, test := range testCases {
-		queryVal := mkLockQueryVal(test.bucket, test.prefix, test.duration)
-		req, err := newTestRequest("DELETE", "/minio/admin/v1/locks?"+queryVal.Encode(), 0, nil)
-		if err != nil {
-			t.Fatalf("Test %d - Failed to construct clear locks request - %v", i+1, err)
-		}
-
-		cred := globalServerConfig.GetCredential()
-		err = signRequestV4(req, cred.AccessKey, cred.SecretKey)
-		if err != nil {
-			t.Fatalf("Test %d - Failed to sign clear locks request - %v", i+1, err)
-		}
-		rec := httptest.NewRecorder()
-		adminTestBed.router.ServeHTTP(rec, req)
-		if test.expectedStatus != rec.Code {
-			t.Errorf("Test %d - Expected HTTP status code %d but received %d", i+1, test.expectedStatus, rec.Code)
-		}
-	}
-}
-
-// Test for lock query param validation helper function.
-func TestValidateLockQueryParams(t *testing.T) {
-	// reset globals.
-	// this is to make sure that the tests are not affected by modified globals.
-	resetTestGlobals()
-	// initialize NSLock.
-	initNSLock(false)
-	// Sample query values for test cases.
-	allValidVal := mkLockQueryVal("bucket", "prefix", "1s")
-	invalidBucketVal := mkLockQueryVal(`invalid\\Bucket`, "prefix", "1s")
-	invalidPrefixVal := mkLockQueryVal("bucket", `invalid\\Prefix`, "1s")
-	invalidOlderThanVal := mkLockQueryVal("bucket", "prefix", "invalidDuration")
-
-	testCases := []struct {
-		qVals  url.Values
-		apiErr APIErrorCode
-	}{
-		{
-			qVals:  invalidBucketVal,
-			apiErr: ErrInvalidBucketName,
-		},
-		{
-			qVals:  invalidPrefixVal,
-			apiErr: ErrInvalidObjectName,
-		},
-		{
-			qVals:  invalidOlderThanVal,
-			apiErr: ErrInvalidDuration,
-		},
-		{
-			qVals:  allValidVal,
-			apiErr: ErrNone,
-		},
-	}
-
-	for i, test := range testCases {
-		_, _, _, apiErr := validateLockQueryParams(test.qVals)
-		if apiErr != test.apiErr {
-			t.Errorf("Test %d - Expected error %v but received %v", i+1, test.apiErr, apiErr)
-		}
-	}
-}
-
 // buildAdminRequest - helper function to build an admin API request.
 func buildAdminRequest(queryVal url.Values, method, path string,
 	contentLength int64, bodySeeker io.ReadSeeker) (*http.Request, error) {
@@ -826,8 +699,14 @@ func TestSetConfigHandler(t *testing.T) {
 	queryVal := url.Values{}
 	queryVal.Set("config", "")
 
+	password := globalServerConfig.GetCredential().SecretKey
+	econfigJSON, err := madmin.EncryptServerConfigData(password, configJSON)
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	req, err := buildAdminRequest(queryVal, http.MethodPut, "/config",
-		int64(len(configJSON)), bytes.NewReader(configJSON))
+		int64(len(econfigJSON)), bytes.NewReader(econfigJSON))
 	if err != nil {
 		t.Fatalf("Failed to construct set-config object request - %v", err)
 	}
@@ -838,16 +717,6 @@ func TestSetConfigHandler(t *testing.T) {
 		t.Errorf("Expected to succeed but failed with %d", rec.Code)
 	}
 
-	result := setConfigResult{}
-	err = json.NewDecoder(rec.Body).Decode(&result)
-	if err != nil {
-		t.Fatalf("Failed to decode set config result json %v", err)
-	}
-
-	if !result.Status {
-		t.Error("Expected set-config to succeed, but failed")
-	}
-
 	// Check that a very large config file returns an error.
 	{
 		// Make a large enough config string
@@ -870,7 +739,7 @@ func TestSetConfigHandler(t *testing.T) {
 	// Check that a config with duplicate keys in an object return
 	// error.
 	{
-		invalidCfg := append(configJSON[:len(configJSON)-1], []byte(`, "version": "15"}`)...)
+		invalidCfg := append(econfigJSON[:len(econfigJSON)-1], []byte(`, "version": "15"}`)...)
 		req, err := buildAdminRequest(queryVal, http.MethodPut, "/config",
 			int64(len(invalidCfg)), bytes.NewReader(invalidCfg))
 		if err != nil {
@@ -968,81 +837,6 @@ func TestToAdminAPIErr(t *testing.T) {
 	}
 }
 
-func TestWriteSetConfigResponse(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(rootPath)
-	testCases := []struct {
-		status bool
-		errs   []error
-	}{
-		// 1. all nodes returned success.
-		{
-			status: true,
-			errs:   []error{nil, nil, nil, nil},
-		},
-		// 2. some nodes returned errors.
-		{
-			status: false,
-			errs:   []error{errDiskNotFound, nil, errDiskAccessDenied, errFaultyDisk},
-		},
-	}
-
-	testPeers := []adminPeer{
-		{
-			addr: "localhost:9001",
-		},
-		{
-			addr: "localhost:9002",
-		},
-		{
-			addr: "localhost:9003",
-		},
-		{
-			addr: "localhost:9004",
-		},
-	}
-
-	testURL, err := url.Parse("http://dummy.com")
-	if err != nil {
-		t.Fatalf("Failed to parse a place-holder url")
-	}
-
-	var actualResult setConfigResult
-	for i, test := range testCases {
-		rec := httptest.NewRecorder()
-		writeSetConfigResponse(rec, testPeers, test.errs, test.status, testURL)
-		resp := rec.Result()
-		jsonBytes, err := ioutil.ReadAll(resp.Body)
-		if err != nil {
-			t.Fatalf("Test %d: Failed to read response %v", i+1, err)
-		}
-
-		err = json.Unmarshal(jsonBytes, &actualResult)
-		if err != nil {
-			t.Fatalf("Test %d: Failed to unmarshal json %v", i+1, err)
-		}
-		if actualResult.Status != test.status {
-			t.Errorf("Test %d: Expected status %v but received %v", i+1, test.status, actualResult.Status)
-		}
-		for p, res := range actualResult.NodeResults {
-			if res.Name != testPeers[p].addr {
-				t.Errorf("Test %d: Expected node name %s but received %s", i+1, testPeers[p].addr, res.Name)
-			}
-			expectedErrMsg := fmt.Sprintf("%v", test.errs[p])
-			if res.ErrMsg != expectedErrMsg {
-				t.Errorf("Test %d: Expected error %s but received %s", i+1, expectedErrMsg, res.ErrMsg)
-			}
-			expectedErrSet := test.errs[p] != nil
-			if res.ErrSet != expectedErrSet {
-				t.Errorf("Test %d: Expected ErrSet %v but received %v", i+1, expectedErrSet, res.ErrSet)
-			}
-		}
-	}
-}
-
 func mkHealStartReq(t *testing.T, bucket, prefix string,
 	opts madmin.HealOpts) *http.Request {
 

cmd/admin-heal-ops.go

@@ -57,7 +57,7 @@ const (
 var (
 	errHealIdleTimeout      = fmt.Errorf("healing results were not consumed for too long")
 	errHealPushStopNDiscard = fmt.Errorf("heal push stopped due to heal stop signal")
-	errHealStopSignalled    = fmt.Errorf("heal stop signalled")
+	errHealStopSignalled    = fmt.Errorf("heal stop signaled")
 
 	errFnHealFromAPIErr = func(err error) error {
 		errCode := toAPIErrorCode(err)
@@ -301,7 +301,7 @@ type healSequence struct {
 	// current accumulated status of the heal sequence
 	currentStatus healSequenceStatus
 
-	// channel signalled by background routine when traversal has
+	// channel signaled by background routine when traversal has
 	// completed
 	traverseAndHealDoneCh chan error
 
@@ -441,7 +441,7 @@ func (h *healSequence) pushHealResultItem(r madmin.HealResultItem) error {
 	h.currentStatus.updateLock.Unlock()
 
 	// This is a "safe" point for the heal sequence to quit if
-	// signalled externally.
+	// signaled externally.
 	if h.isQuitting() {
 		return errHealStopSignalled
 	}

cmd/admin-router.go

@@ -53,13 +53,6 @@ func registerAdminRouter(router *mux.Router) {
 	// Info operations
 	adminV1Router.Methods(http.MethodGet).Path("/info").HandlerFunc(httpTraceAll(adminAPI.ServerInfoHandler))
 
-	/// Lock operations
-
-	// List Locks
-	adminV1Router.Methods(http.MethodGet).Path("/locks").HandlerFunc(httpTraceAll(adminAPI.ListLocksHandler))
-	// Clear locks
-	adminV1Router.Methods(http.MethodDelete).Path("/locks").HandlerFunc(httpTraceAll(adminAPI.ClearLocksHandler))
-
 	/// Heal operations
 
 	// Heal processing endpoint.
@@ -70,9 +63,9 @@ func registerAdminRouter(router *mux.Router) {
 	/// Config operations
 
 	// Update credentials
-	adminV1Router.Methods(http.MethodPut).Path("/config/credential").HandlerFunc(httpTraceAll(adminAPI.UpdateCredentialsHandler))
+	adminV1Router.Methods(http.MethodPut).Path("/config/credential").HandlerFunc(httpTraceHdrs(adminAPI.UpdateCredentialsHandler))
 	// Get config
-	adminV1Router.Methods(http.MethodGet).Path("/config").HandlerFunc(httpTraceAll(adminAPI.GetConfigHandler))
+	adminV1Router.Methods(http.MethodGet).Path("/config").HandlerFunc(httpTraceHdrs(adminAPI.GetConfigHandler))
 	// Set config
-	adminV1Router.Methods(http.MethodPut).Path("/config").HandlerFunc(httpTraceAll(adminAPI.SetConfigHandler))
+	adminV1Router.Methods(http.MethodPut).Path("/config").HandlerFunc(httpTraceHdrs(adminAPI.SetConfigHandler))
 }

cmd/admin-rpc-client.go

@@ -19,7 +19,6 @@ package cmd
 import (
 	"context"
 	"crypto/tls"
-	"encoding/json"
 	"fmt"
 	"net"
 	"sort"
@@ -54,19 +53,6 @@ func (rpcClient *AdminRPCClient) ReInitFormat(dryRun bool) error {
 	return rpcClient.Call(adminServiceName+".ReInitFormat", &args, &reply)
 }
 
-// ListLocks - Sends list locks command to remote server via RPC.
-func (rpcClient *AdminRPCClient) ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
-	args := ListLocksQuery{
-		Bucket:   bucket,
-		Prefix:   prefix,
-		Duration: duration,
-	}
-	var reply []VolumeLockInfo
-
-	err := rpcClient.Call(adminServiceName+".ListLocks", &args, &reply)
-	return reply, err
-}
-
 // ServerInfo - returns the server info of the server to which the RPC call is made.
 func (rpcClient *AdminRPCClient) ServerInfo() (sid ServerInfoData, err error) {
 	err = rpcClient.Call(adminServiceName+".ServerInfo", &AuthArgs{}, &sid)
@@ -82,29 +68,6 @@ func (rpcClient *AdminRPCClient) GetConfig() ([]byte, error) {
 	return reply, err
 }
 
-// WriteTmpConfig - writes config file content to a temporary file on a remote node.
-func (rpcClient *AdminRPCClient) WriteTmpConfig(tmpFileName string, configBytes []byte) error {
-	args := WriteConfigArgs{
-		TmpFileName: tmpFileName,
-		Buf:         configBytes,
-	}
-	reply := VoidReply{}
-
-	err := rpcClient.Call(adminServiceName+".WriteTmpConfig", &args, &reply)
-	logger.LogIf(context.Background(), err)
-	return err
-}
-
-// CommitConfig - Move the new config in tmpFileName onto config.json on a remote node.
-func (rpcClient *AdminRPCClient) CommitConfig(tmpFileName string) error {
-	args := CommitConfigArgs{FileName: tmpFileName}
-	reply := VoidReply{}
-
-	err := rpcClient.Call(adminServiceName+".CommitConfig", &args, &reply)
-	logger.LogIf(context.Background(), err)
-	return err
-}
-
 // NewAdminRPCClient - returns new admin RPC client.
 func NewAdminRPCClient(host *xnet.Host) (*AdminRPCClient, error) {
 	scheme := "http"
@@ -147,11 +110,8 @@ func NewAdminRPCClient(host *xnet.Host) (*AdminRPCClient, error) {
 type adminCmdRunner interface {
 	SignalService(s serviceSignal) error
 	ReInitFormat(dryRun bool) error
-	ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error)
 	ServerInfo() (ServerInfoData, error)
 	GetConfig() ([]byte, error)
-	WriteTmpConfig(tmpFileName string, configBytes []byte) error
-	CommitConfig(tmpFileName string) error
 }
 
 // adminPeer - represents an entity that implements admin API RPCs.
@@ -179,9 +139,9 @@ func makeAdminPeers(endpoints EndpointList) (adminPeerList adminPeers) {
 
 	for _, hostStr := range GetRemotePeers(endpoints) {
 		host, err := xnet.ParseHost(hostStr)
-		logger.CriticalIf(context.Background(), err)
+		logger.FatalIf(err, "Unable to parse Admin RPC Host", context.Background())
 		rpcClient, err := NewAdminRPCClient(host)
-		logger.CriticalIf(context.Background(), err)
+		logger.FatalIf(err, "Unable to initialize Admin RPC Client", context.Background())
 		adminPeerList = append(adminPeerList, adminPeer{
 			addr:      hostStr,
 			cmdRunner: rpcClient,
@@ -244,56 +204,6 @@ func sendServiceCmd(cps adminPeers, cmd serviceSignal) {
 	errs[0] = invokeServiceCmd(cps[0], cmd)
 }
 
-// listPeerLocksInfo - fetch list of locks held on the given bucket,
-// matching prefix held longer than duration from all peer servers.
-func listPeerLocksInfo(peers adminPeers, bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
-	// Used to aggregate volume lock information from all nodes.
-	allLocks := make([][]VolumeLockInfo, len(peers))
-	errs := make([]error, len(peers))
-	var wg sync.WaitGroup
-	localPeer := peers[0]
-	remotePeers := peers[1:]
-	for i, remotePeer := range remotePeers {
-		wg.Add(1)
-		go func(idx int, remotePeer adminPeer) {
-			defer wg.Done()
-			// `remotePeers` is right-shifted by one position relative to `peers`
-			allLocks[idx], errs[idx] = remotePeer.cmdRunner.ListLocks(bucket, prefix, duration)
-		}(i+1, remotePeer)
-	}
-	wg.Wait()
-	allLocks[0], errs[0] = localPeer.cmdRunner.ListLocks(bucket, prefix, duration)
-
-	// Summarizing errors received for ListLocks RPC across all
-	// nodes.  N B the possible unavailability of quorum in errors
-	// applies only to distributed setup.
-	errCount, err := reduceErrs(errs, []error{})
-	if err != nil {
-		if errCount >= (len(peers)/2 + 1) {
-			return nil, err
-		}
-		return nil, InsufficientReadQuorum{}
-	}
-
-	// Group lock information across nodes by (bucket, object)
-	// pair. For readability only.
-	paramLockMap := make(map[nsParam][]VolumeLockInfo)
-	for _, nodeLocks := range allLocks {
-		for _, lockInfo := range nodeLocks {
-			param := nsParam{
-				volume: lockInfo.Bucket,
-				path:   lockInfo.Object,
-			}
-			paramLockMap[param] = append(paramLockMap[param], lockInfo)
-		}
-	}
-	groupedLockInfos := []VolumeLockInfo{}
-	for _, volLocks := range paramLockMap {
-		groupedLockInfos = append(groupedLockInfos, volLocks...)
-	}
-	return groupedLockInfos, nil
-}
-
 // uptimeSlice - used to sort uptimes in chronological order.
 type uptimeSlice []struct {
 	err    error
@@ -365,187 +275,3 @@ func getPeerUptimes(peers adminPeers) (time.Duration, error) {
 
 	return latestUptime, nil
 }
-
-// getPeerConfig - Fetches config.json from all nodes in the setup and
-// returns the one that occurs in a majority of them.
-func getPeerConfig(peers adminPeers) ([]byte, error) {
-	if !globalIsDistXL {
-		return peers[0].cmdRunner.GetConfig()
-	}
-
-	errs := make([]error, len(peers))
-	configs := make([][]byte, len(peers))
-
-	// Get config from all servers.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			configs[idx], errs[idx] = peer.cmdRunner.GetConfig()
-		}(i, peer)
-	}
-	wg.Wait()
-
-	// Find the maximally occurring config among peers in a
-	// distributed setup.
-
-	serverConfigs := make([]serverConfig, len(peers))
-	for i, configBytes := range configs {
-		if errs[i] != nil {
-			continue
-		}
-
-		// Unmarshal the received config files.
-		err := json.Unmarshal(configBytes, &serverConfigs[i])
-		if err != nil {
-			reqInfo := (&logger.ReqInfo{}).AppendTags("peerAddress", peers[i].addr)
-			ctx := logger.SetReqInfo(context.Background(), reqInfo)
-			logger.LogIf(ctx, err)
-			return nil, err
-		}
-	}
-
-	configJSON, err := getValidServerConfig(serverConfigs, errs)
-	if err != nil {
-		logger.LogIf(context.Background(), err)
-		return nil, err
-	}
-
-	// Return the config.json that was present quorum or more
-	// number of disks.
-	return json.Marshal(configJSON)
-}
-
-// getValidServerConfig - finds the server config that is present in
-// quorum or more number of servers.
-func getValidServerConfig(serverConfigs []serverConfig, errs []error) (scv serverConfig, e error) {
-	// majority-based quorum
-	quorum := len(serverConfigs)/2 + 1
-
-	// Count the number of disks a config.json was found in.
-	configCounter := make([]int, len(serverConfigs))
-
-	// We group equal serverConfigs by the lowest index of the
-	// same value;  e.g, let us take the following serverConfigs
-	// in a 4-node setup,
-	// serverConfigs == [c1, c2, c1, c1]
-	// configCounter == [3, 1, 0, 0]
-	// c1, c2 are the only distinct values that appear.  c1 is
-	// identified by 0, the lowest index it appears in and c2 is
-	// identified by 1. So, we need to find the number of times
-	// each of these distinct values occur.
-
-	// Invariants:
-
-	// 1. At the beginning of the i-th iteration, the number of
-	// unique configurations seen so far is equal to the number of
-	// non-zero counter values in config[:i].
-
-	// 2. At the beginning of the i-th iteration, the sum of
-	// elements of configCounter[:i] is equal to the number of
-	// non-error configurations seen so far.
-
-	// For each of the serverConfig ...
-	for i := range serverConfigs {
-		// Skip nodes where getConfig failed.
-		if errs[i] != nil {
-			continue
-		}
-		// Check if it is equal to any of the configurations
-		// seen so far. If j == i is reached then we have an
-		// unseen configuration.
-		for j := 0; j <= i; j++ {
-			if j < i && configCounter[j] == 0 {
-				// serverConfigs[j] is known to be
-				// equal to a value that was already
-				// seen. See example above for
-				// clarity.
-				continue
-			} else if j < i && serverConfigs[i].ConfigDiff(&serverConfigs[j]) == "" {
-				// serverConfigs[i] is equal to
-				// serverConfigs[j], update
-				// serverConfigs[j]'s counter since it
-				// is the lower index.
-				configCounter[j]++
-				break
-			} else if j == i {
-				// serverConfigs[i] is equal to no
-				// other value seen before. It is
-				// unique so far.
-				configCounter[i] = 1
-				break
-			} // else invariants specified above are violated.
-		}
-	}
-
-	// We find the maximally occurring server config and check if
-	// there is quorum.
-	var configJSON serverConfig
-	maxOccurrence := 0
-	for i, count := range configCounter {
-		if maxOccurrence < count {
-			maxOccurrence = count
-			configJSON = serverConfigs[i]
-		}
-	}
-
-	// If quorum nodes don't agree.
-	if maxOccurrence < quorum {
-		return scv, errXLWriteQuorum
-	}
-
-	return configJSON, nil
-}
-
-// Write config contents into a temporary file on all nodes.
-func writeTmpConfigPeers(peers adminPeers, tmpFileName string, configBytes []byte) []error {
-	// For a single-node minio server setup.
-	if !globalIsDistXL {
-		err := peers[0].cmdRunner.WriteTmpConfig(tmpFileName, configBytes)
-		return []error{err}
-	}
-
-	errs := make([]error, len(peers))
-
-	// Write config into temporary file on all nodes.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			errs[idx] = peer.cmdRunner.WriteTmpConfig(tmpFileName, configBytes)
-		}(i, peer)
-	}
-	wg.Wait()
-
-	// Return bytes written and errors (if any) during writing
-	// temporary config file.
-	return errs
-}
-
-// Move config contents from the given temporary file onto config.json
-// on all nodes.
-func commitConfigPeers(peers adminPeers, tmpFileName string) []error {
-	// For a single-node minio server setup.
-	if !globalIsDistXL {
-		return []error{peers[0].cmdRunner.CommitConfig(tmpFileName)}
-	}
-
-	errs := make([]error, len(peers))
-
-	// Rename temporary config file into configDir/config.json on
-	// all nodes.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			errs[idx] = peer.cmdRunner.CommitConfig(tmpFileName)
-		}(i, peer)
-	}
-	wg.Wait()
-
-	// Return errors (if any) received during rename.
-	return errs
-}

cmd/admin-rpc-client.go.orig

@@ -1,650 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2014, 2015, 2016, 2017, 2018 Minio, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package cmd
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"net"
-	"os"
-	"path"
-	"path/filepath"
-	"sort"
-	"sync"
-	"time"
-
-	"github.com/minio/minio-go/pkg/set"
-	"github.com/minio/minio/cmd/logger"
-)
-
-const (
-	// Admin service names
-	signalServiceRPC  = "Admin.SignalService"
-	reInitFormatRPC   = "Admin.ReInitFormat"
-	listLocksRPC      = "Admin.ListLocks"
-	serverInfoDataRPC = "Admin.ServerInfoData"
-	getConfigRPC      = "Admin.GetConfig"
-	writeTmpConfigRPC = "Admin.WriteTmpConfig"
-	commitConfigRPC   = "Admin.CommitConfig"
-)
-
-// localAdminClient - represents admin operation to be executed locally.
-type localAdminClient struct {
-}
-
-// remoteAdminClient - represents admin operation to be executed
-// remotely, via RPC.
-type remoteAdminClient struct {
-	*AuthRPCClient
-}
-
-// adminCmdRunner - abstracts local and remote execution of admin
-// commands like service stop and service restart.
-type adminCmdRunner interface {
-	SignalService(s serviceSignal) error
-	ReInitFormat(dryRun bool) error
-	ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error)
-	ServerInfoData() (ServerInfoData, error)
-	GetConfig() ([]byte, error)
-	WriteTmpConfig(tmpFileName string, configBytes []byte) error
-	CommitConfig(tmpFileName string) error
-}
-
-var errUnsupportedSignal = fmt.Errorf("unsupported signal: only restart and stop signals are supported")
-
-// SignalService - sends a restart or stop signal to the local server
-func (lc localAdminClient) SignalService(s serviceSignal) error {
-	switch s {
-	case serviceRestart, serviceStop:
-		globalServiceSignalCh <- s
-	default:
-		return errUnsupportedSignal
-	}
-	return nil
-}
-
-// ReInitFormat - re-initialize disk format.
-func (lc localAdminClient) ReInitFormat(dryRun bool) error {
-	objectAPI := newObjectLayerFn()
-	if objectAPI == nil {
-		return errServerNotInitialized
-	}
-	return objectAPI.ReloadFormat(context.Background(), dryRun)
-}
-
-// ListLocks - Fetches lock information from local lock instrumentation.
-func (lc localAdminClient) ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
-	// check if objectLayer is initialized, if not return.
-	objectAPI := newObjectLayerFn()
-	if objectAPI == nil {
-		return nil, errServerNotInitialized
-	}
-	return objectAPI.ListLocks(context.Background(), bucket, prefix, duration)
-}
-
-func (rc remoteAdminClient) SignalService(s serviceSignal) (err error) {
-	switch s {
-	case serviceRestart, serviceStop:
-		reply := AuthRPCReply{}
-		err = rc.Call(signalServiceRPC, &SignalServiceArgs{Sig: s},
-			&reply)
-	default:
-		err = errUnsupportedSignal
-	}
-	return err
-}
-
-// ReInitFormat - re-initialize disk format, remotely.
-func (rc remoteAdminClient) ReInitFormat(dryRun bool) error {
-	reply := AuthRPCReply{}
-	return rc.Call(reInitFormatRPC, &ReInitFormatArgs{
-		DryRun: dryRun,
-	}, &reply)
-}
-
-// ListLocks - Sends list locks command to remote server via RPC.
-func (rc remoteAdminClient) ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
-	listArgs := ListLocksQuery{
-		Bucket:   bucket,
-		Prefix:   prefix,
-		Duration: duration,
-	}
-	var reply ListLocksReply
-	if err := rc.Call(listLocksRPC, &listArgs, &reply); err != nil {
-		return nil, err
-	}
-	return reply.VolLocks, nil
-}
-
-// ServerInfoData - Returns the server info of this server.
-func (lc localAdminClient) ServerInfoData() (sid ServerInfoData, e error) {
-	if globalBootTime.IsZero() {
-		return sid, errServerNotInitialized
-	}
-
-	// Build storage info
-	objLayer := newObjectLayerFn()
-	if objLayer == nil {
-		return sid, errServerNotInitialized
-	}
-	storage := objLayer.StorageInfo(context.Background())
-
-	return ServerInfoData{
-		StorageInfo: storage,
-		ConnStats:   globalConnStats.toServerConnStats(),
-		HTTPStats:   globalHTTPStats.toServerHTTPStats(),
-		Properties: ServerProperties{
-			Uptime:   UTCNow().Sub(globalBootTime),
-			Version:  Version,
-			CommitID: CommitID,
-			SQSARN:   globalNotificationSys.GetARNList(),
-			Region:   globalServerConfig.GetRegion(),
-		},
-	}, nil
-}
-
-// ServerInfo - returns the server info of the server to which the RPC call is made.
-func (rc remoteAdminClient) ServerInfoData() (sid ServerInfoData, e error) {
-	args := AuthRPCArgs{}
-	reply := ServerInfoDataReply{}
-	err := rc.Call(serverInfoDataRPC, &args, &reply)
-	if err != nil {
-		return sid, err
-	}
-
-	return reply.ServerInfoData, nil
-}
-
-// GetConfig - returns config.json of the local server.
-func (lc localAdminClient) GetConfig() ([]byte, error) {
-	if globalServerConfig == nil {
-		return nil, fmt.Errorf("config not present")
-	}
-
-	return json.Marshal(globalServerConfig)
-}
-
-// GetConfig - returns config.json of the remote server.
-func (rc remoteAdminClient) GetConfig() ([]byte, error) {
-	args := AuthRPCArgs{}
-	reply := ConfigReply{}
-	if err := rc.Call(getConfigRPC, &args, &reply); err != nil {
-		return nil, err
-	}
-	return reply.Config, nil
-}
-
-// WriteTmpConfig - writes config file content to a temporary file on
-// the local server.
-func (lc localAdminClient) WriteTmpConfig(tmpFileName string, configBytes []byte) error {
-	return writeTmpConfigCommon(tmpFileName, configBytes)
-}
-
-// WriteTmpConfig - writes config file content to a temporary file on
-// a remote node.
-func (rc remoteAdminClient) WriteTmpConfig(tmpFileName string, configBytes []byte) error {
-	wArgs := WriteConfigArgs{
-		TmpFileName: tmpFileName,
-		Buf:         configBytes,
-	}
-
-	err := rc.Call(writeTmpConfigRPC, &wArgs, &WriteConfigReply{})
-	if err != nil {
-		logger.LogIf(context.Background(), err)
-		return err
-	}
-
-	return nil
-}
-
-// CommitConfig - Move the new config in tmpFileName onto config.json
-// on a local node.
-func (lc localAdminClient) CommitConfig(tmpFileName string) error {
-	configFile := getConfigFile()
-	tmpConfigFile := filepath.Join(getConfigDir(), tmpFileName)
-
-	err := os.Rename(tmpConfigFile, configFile)
-	reqInfo := (&logger.ReqInfo{}).AppendTags("tmpConfigFile", tmpConfigFile)
-	reqInfo.AppendTags("configFile", configFile)
-	ctx := logger.SetReqInfo(context.Background(), reqInfo)
-	logger.LogIf(ctx, err)
-	return err
-}
-
-// CommitConfig - Move the new config in tmpFileName onto config.json
-// on a remote node.
-func (rc remoteAdminClient) CommitConfig(tmpFileName string) error {
-	cArgs := CommitConfigArgs{
-		FileName: tmpFileName,
-	}
-	cReply := CommitConfigReply{}
-	err := rc.Call(commitConfigRPC, &cArgs, &cReply)
-	if err != nil {
-		logger.LogIf(context.Background(), err)
-		return err
-	}
-
-	return nil
-}
-
-// adminPeer - represents an entity that implements admin API RPCs.
-type adminPeer struct {
-	addr      string
-	cmdRunner adminCmdRunner
-	isLocal   bool
-}
-
-// type alias for a collection of adminPeer.
-type adminPeers []adminPeer
-
-// makeAdminPeers - helper function to construct a collection of adminPeer.
-func makeAdminPeers(endpoints EndpointList) (adminPeerList adminPeers) {
-	thisPeer := globalMinioAddr
-	if globalMinioHost == "" {
-		// When host is not explicitly provided simply
-		// use the first IPv4.
-		thisPeer = net.JoinHostPort(sortIPs(localIP4.ToSlice())[0], globalMinioPort)
-	}
-	adminPeerList = append(adminPeerList, adminPeer{
-		thisPeer,
-		localAdminClient{},
-		true,
-	})
-
-	hostSet := set.CreateStringSet(globalMinioAddr)
-	cred := globalServerConfig.GetCredential()
-	serviceEndpoint := path.Join(minioReservedBucketPath, adminPath)
-	for _, host := range GetRemotePeers(endpoints) {
-		if hostSet.Contains(host) {
-			continue
-		}
-		hostSet.Add(host)
-		adminPeerList = append(adminPeerList, adminPeer{
-			addr: host,
-			cmdRunner: &remoteAdminClient{newAuthRPCClient(authConfig{
-				accessKey:       cred.AccessKey,
-				secretKey:       cred.SecretKey,
-				serverAddr:      host,
-				serviceEndpoint: serviceEndpoint,
-				secureConn:      globalIsSSL,
-				serviceName:     "Admin",
-			})},
-		})
-	}
-
-	return adminPeerList
-}
-
-// peersReInitFormat - reinitialize remote object layers to new format.
-func peersReInitFormat(peers adminPeers, dryRun bool) error {
-	errs := make([]error, len(peers))
-
-	// Send ReInitFormat RPC call to all nodes.
-	// for local adminPeer this is a no-op.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			if !peer.isLocal {
-				errs[idx] = peer.cmdRunner.ReInitFormat(dryRun)
-			}
-		}(i, peer)
-	}
-	wg.Wait()
-	return nil
-}
-
-// Initialize global adminPeer collection.
-func initGlobalAdminPeers(endpoints EndpointList) {
-	globalAdminPeers = makeAdminPeers(endpoints)
-}
-
-// invokeServiceCmd - Invoke Restart/Stop command.
-func invokeServiceCmd(cp adminPeer, cmd serviceSignal) (err error) {
-	switch cmd {
-	case serviceRestart, serviceStop:
-		err = cp.cmdRunner.SignalService(cmd)
-	}
-	return err
-}
-
-// sendServiceCmd - Invoke Restart command on remote peers
-// adminPeer followed by on the local peer.
-func sendServiceCmd(cps adminPeers, cmd serviceSignal) {
-	// Send service command like stop or restart to all remote nodes and finally run on local node.
-	errs := make([]error, len(cps))
-	var wg sync.WaitGroup
-	remotePeers := cps[1:]
-	for i := range remotePeers {
-		wg.Add(1)
-		go func(idx int) {
-			defer wg.Done()
-			// we use idx+1 because remotePeers slice is 1 position shifted w.r.t cps
-			errs[idx+1] = invokeServiceCmd(remotePeers[idx], cmd)
-		}(i)
-	}
-	wg.Wait()
-	errs[0] = invokeServiceCmd(cps[0], cmd)
-}
-
-// listPeerLocksInfo - fetch list of locks held on the given bucket,
-// matching prefix held longer than duration from all peer servers.
-func listPeerLocksInfo(peers adminPeers, bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
-	// Used to aggregate volume lock information from all nodes.
-	allLocks := make([][]VolumeLockInfo, len(peers))
-	errs := make([]error, len(peers))
-	var wg sync.WaitGroup
-	localPeer := peers[0]
-	remotePeers := peers[1:]
-	for i, remotePeer := range remotePeers {
-		wg.Add(1)
-		go func(idx int, remotePeer adminPeer) {
-			defer wg.Done()
-			// `remotePeers` is right-shifted by one position relative to `peers`
-			allLocks[idx], errs[idx] = remotePeer.cmdRunner.ListLocks(bucket, prefix, duration)
-		}(i+1, remotePeer)
-	}
-	wg.Wait()
-	allLocks[0], errs[0] = localPeer.cmdRunner.ListLocks(bucket, prefix, duration)
-
-	// Summarizing errors received for ListLocks RPC across all
-	// nodes.  N B the possible unavailability of quorum in errors
-	// applies only to distributed setup.
-	errCount, err := reduceErrs(errs, []error{})
-	if err != nil {
-		if errCount >= (len(peers)/2 + 1) {
-			return nil, err
-		}
-		return nil, InsufficientReadQuorum{}
-	}
-
-	// Group lock information across nodes by (bucket, object)
-	// pair. For readability only.
-	paramLockMap := make(map[nsParam][]VolumeLockInfo)
-	for _, nodeLocks := range allLocks {
-		for _, lockInfo := range nodeLocks {
-			param := nsParam{
-				volume: lockInfo.Bucket,
-				path:   lockInfo.Object,
-			}
-			paramLockMap[param] = append(paramLockMap[param], lockInfo)
-		}
-	}
-	groupedLockInfos := []VolumeLockInfo{}
-	for _, volLocks := range paramLockMap {
-		groupedLockInfos = append(groupedLockInfos, volLocks...)
-	}
-	return groupedLockInfos, nil
-}
-
-// uptimeSlice - used to sort uptimes in chronological order.
-type uptimeSlice []struct {
-	err    error
-	uptime time.Duration
-}
-
-func (ts uptimeSlice) Len() int {
-	return len(ts)
-}
-
-func (ts uptimeSlice) Less(i, j int) bool {
-	return ts[i].uptime < ts[j].uptime
-}
-
-func (ts uptimeSlice) Swap(i, j int) {
-	ts[i], ts[j] = ts[j], ts[i]
-}
-
-// getPeerUptimes - returns the uptime since the last time read quorum
-// was established on success. Otherwise returns errXLReadQuorum.
-func getPeerUptimes(peers adminPeers) (time.Duration, error) {
-	// In a single node Erasure or FS backend setup the uptime of
-	// the setup is the uptime of the single minio server
-	// instance.
-	if !globalIsDistXL {
-		return UTCNow().Sub(globalBootTime), nil
-	}
-
-	uptimes := make(uptimeSlice, len(peers))
-
-	// Get up time of all servers.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			serverInfoData, rpcErr := peer.cmdRunner.ServerInfoData()
-			uptimes[idx].uptime, uptimes[idx].err = serverInfoData.Properties.Uptime, rpcErr
-		}(i, peer)
-	}
-	wg.Wait()
-
-	// Sort uptimes in chronological order.
-	sort.Sort(uptimes)
-
-	// Pick the readQuorum'th uptime in chronological order. i.e,
-	// the time at which read quorum was (re-)established.
-	readQuorum := len(uptimes) / 2
-	validCount := 0
-	latestUptime := time.Duration(0)
-	for _, uptime := range uptimes {
-		if uptime.err != nil {
-			logger.LogIf(context.Background(), uptime.err)
-			continue
-		}
-
-		validCount++
-		if validCount >= readQuorum {
-			latestUptime = uptime.uptime
-			break
-		}
-	}
-
-	// Less than readQuorum "Admin.Uptime" RPC call returned
-	// successfully, so read-quorum unavailable.
-	if validCount < readQuorum {
-		return time.Duration(0), InsufficientReadQuorum{}
-	}
-
-	return latestUptime, nil
-}
-
-// getPeerConfig - Fetches config.json from all nodes in the setup and
-// returns the one that occurs in a majority of them.
-func getPeerConfig(peers adminPeers) ([]byte, error) {
-	if !globalIsDistXL {
-		return peers[0].cmdRunner.GetConfig()
-	}
-
-	errs := make([]error, len(peers))
-	configs := make([][]byte, len(peers))
-
-	// Get config from all servers.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			configs[idx], errs[idx] = peer.cmdRunner.GetConfig()
-		}(i, peer)
-	}
-	wg.Wait()
-
-	// Find the maximally occurring config among peers in a
-	// distributed setup.
-
-	serverConfigs := make([]serverConfig, len(peers))
-	for i, configBytes := range configs {
-		if errs[i] != nil {
-			continue
-		}
-
-		// Unmarshal the received config files.
-		err := json.Unmarshal(configBytes, &serverConfigs[i])
-		if err != nil {
-			reqInfo := (&logger.ReqInfo{}).AppendTags("peerAddress", peers[i].addr)
-			ctx := logger.SetReqInfo(context.Background(), reqInfo)
-			logger.LogIf(ctx, err)
-			return nil, err
-		}
-	}
-
-	configJSON, err := getValidServerConfig(serverConfigs, errs)
-	if err != nil {
-		logger.LogIf(context.Background(), err)
-		return nil, err
-	}
-
-	// Return the config.json that was present quorum or more
-	// number of disks.
-	return json.Marshal(configJSON)
-}
-
-// getValidServerConfig - finds the server config that is present in
-// quorum or more number of servers.
-func getValidServerConfig(serverConfigs []serverConfig, errs []error) (scv serverConfig, e error) {
-	// majority-based quorum
-	quorum := len(serverConfigs)/2 + 1
-
-	// Count the number of disks a config.json was found in.
-	configCounter := make([]int, len(serverConfigs))
-
-	// We group equal serverConfigs by the lowest index of the
-	// same value;  e.g, let us take the following serverConfigs
-	// in a 4-node setup,
-	// serverConfigs == [c1, c2, c1, c1]
-	// configCounter == [3, 1, 0, 0]
-	// c1, c2 are the only distinct values that appear.  c1 is
-	// identified by 0, the lowest index it appears in and c2 is
-	// identified by 1. So, we need to find the number of times
-	// each of these distinct values occur.
-
-	// Invariants:
-
-	// 1. At the beginning of the i-th iteration, the number of
-	// unique configurations seen so far is equal to the number of
-	// non-zero counter values in config[:i].
-
-	// 2. At the beginning of the i-th iteration, the sum of
-	// elements of configCounter[:i] is equal to the number of
-	// non-error configurations seen so far.
-
-	// For each of the serverConfig ...
-	for i := range serverConfigs {
-		// Skip nodes where getConfig failed.
-		if errs[i] != nil {
-			continue
-		}
-		// Check if it is equal to any of the configurations
-		// seen so far. If j == i is reached then we have an
-		// unseen configuration.
-		for j := 0; j <= i; j++ {
-			if j < i && configCounter[j] == 0 {
-				// serverConfigs[j] is known to be
-				// equal to a value that was already
-				// seen. See example above for
-				// clarity.
-				continue
-			} else if j < i && serverConfigs[i].ConfigDiff(&serverConfigs[j]) == "" {
-				// serverConfigs[i] is equal to
-				// serverConfigs[j], update
-				// serverConfigs[j]'s counter since it
-				// is the lower index.
-				configCounter[j]++
-				break
-			} else if j == i {
-				// serverConfigs[i] is equal to no
-				// other value seen before. It is
-				// unique so far.
-				configCounter[i] = 1
-				break
-			} // else invariants specified above are violated.
-		}
-	}
-
-	// We find the maximally occurring server config and check if
-	// there is quorum.
-	var configJSON serverConfig
-	maxOccurrence := 0
-	for i, count := range configCounter {
-		if maxOccurrence < count {
-			maxOccurrence = count
-			configJSON = serverConfigs[i]
-		}
-	}
-
-	// If quorum nodes don't agree.
-	if maxOccurrence < quorum {
-		return scv, errXLWriteQuorum
-	}
-
-	return configJSON, nil
-}
-
-// Write config contents into a temporary file on all nodes.
-func writeTmpConfigPeers(peers adminPeers, tmpFileName string, configBytes []byte) []error {
-	// For a single-node minio server setup.
-	if !globalIsDistXL {
-		err := peers[0].cmdRunner.WriteTmpConfig(tmpFileName, configBytes)
-		return []error{err}
-	}
-
-	errs := make([]error, len(peers))
-
-	// Write config into temporary file on all nodes.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			errs[idx] = peer.cmdRunner.WriteTmpConfig(tmpFileName, configBytes)
-		}(i, peer)
-	}
-	wg.Wait()
-
-	// Return bytes written and errors (if any) during writing
-	// temporary config file.
-	return errs
-}
-
-// Move config contents from the given temporary file onto config.json
-// on all nodes.
-func commitConfigPeers(peers adminPeers, tmpFileName string) []error {
-	// For a single-node minio server setup.
-	if !globalIsDistXL {
-		return []error{peers[0].cmdRunner.CommitConfig(tmpFileName)}
-	}
-
-	errs := make([]error, len(peers))
-
-	// Rename temporary config file into configDir/config.json on
-	// all nodes.
-	wg := sync.WaitGroup{}
-	for i, peer := range peers {
-		wg.Add(1)
-		go func(idx int, peer adminPeer) {
-			defer wg.Done()
-			errs[idx] = peer.cmdRunner.CommitConfig(tmpFileName)
-		}(i, peer)
-	}
-	wg.Wait()
-
-	// Return errors (if any) received during rename.
-	return errs
-}

cmd/admin-rpc-server.go

@@ -19,7 +19,6 @@ package cmd
 import (
 	"context"
 	"path"
-	"time"
 
 	"github.com/gorilla/mux"
 	"github.com/minio/minio/cmd/logger"
@@ -47,20 +46,6 @@ func (receiver *adminRPCReceiver) SignalService(args *SignalServiceArgs, reply *
 	return receiver.local.SignalService(args.Sig)
 }
 
-// ListLocksQuery - wraps ListLocks API's query values to send over RPC.
-type ListLocksQuery struct {
-	AuthArgs
-	Bucket   string
-	Prefix   string
-	Duration time.Duration
-}
-
-// ListLocks - lists locks held by requests handled by this server instance.
-func (receiver *adminRPCReceiver) ListLocks(args *ListLocksQuery, reply *[]VolumeLockInfo) (err error) {
-	*reply, err = receiver.local.ListLocks(args.Bucket, args.Prefix, args.Duration)
-	return err
-}
-
 // ServerInfo - returns the server info when object layer was initialized on this server.
 func (receiver *adminRPCReceiver) ServerInfo(args *AuthArgs, reply *ServerInfoData) (err error) {
 	*reply, err = receiver.local.ServerInfo()
@@ -84,31 +69,6 @@ func (receiver *adminRPCReceiver) ReInitFormat(args *ReInitFormatArgs, reply *Vo
 	return receiver.local.ReInitFormat(args.DryRun)
 }
 
-// WriteConfigArgs - wraps the bytes to be written and temporary file name.
-type WriteConfigArgs struct {
-	AuthArgs
-	TmpFileName string
-	Buf         []byte
-}
-
-// WriteTmpConfig - writes the supplied config contents onto the
-// supplied temporary file.
-func (receiver *adminRPCReceiver) WriteTmpConfig(args *WriteConfigArgs, reply *VoidReply) error {
-	return receiver.local.WriteTmpConfig(args.TmpFileName, args.Buf)
-}
-
-// CommitConfigArgs - wraps the config file name that needs to be
-// committed into config.json on this node.
-type CommitConfigArgs struct {
-	AuthArgs
-	FileName string
-}
-
-// CommitConfig - Renames the temporary file into config.json on this node.
-func (receiver *adminRPCReceiver) CommitConfig(args *CommitConfigArgs, reply *VoidReply) error {
-	return receiver.local.CommitConfig(args.FileName)
-}
-
 // NewAdminRPCServer - returns new admin RPC server.
 func NewAdminRPCServer() (*xrpc.Server, error) {
 	rpcServer := xrpc.NewServer()
@@ -121,7 +81,7 @@ func NewAdminRPCServer() (*xrpc.Server, error) {
 // registerAdminRPCRouter - creates and registers Admin RPC server and its router.
 func registerAdminRPCRouter(router *mux.Router) {
 	rpcServer, err := NewAdminRPCServer()
-	logger.CriticalIf(context.Background(), err)
+	logger.FatalIf(err, "Unable to initialize Lock RPC Server", context.Background())
 	subrouter := router.PathPrefix(minioReservedBucketPath).Subrouter()
-	subrouter.Path(adminServiceSubPath).Handler(rpcServer)
+	subrouter.Path(adminServiceSubPath).HandlerFunc(httpTraceHdrs(rpcServer.ServeHTTP))
 }

cmd/admin-rpc_test.go

@@ -17,13 +17,8 @@
 package cmd
 
 import (
-	"encoding/json"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
-	"os"
-	"path/filepath"
-	"reflect"
 	"testing"
 	"time"
 
@@ -99,31 +94,6 @@ func testAdminCmdRunnerReInitFormat(t *testing.T, client adminCmdRunner) {
 	}
 }
 
-func testAdminCmdRunnerListLocks(t *testing.T, client adminCmdRunner) {
-	tmpGlobalObjectAPI := globalObjectAPI
-	defer func() {
-		globalObjectAPI = tmpGlobalObjectAPI
-	}()
-
-	testCases := []struct {
-		objectAPI ObjectLayer
-		expectErr bool
-	}{
-		{&DummyObjectLayer{}, false},
-		{nil, true},
-	}
-
-	for i, testCase := range testCases {
-		globalObjectAPI = testCase.objectAPI
-		_, err := client.ListLocks("", "", time.Duration(0))
-		expectErr := (err != nil)
-
-		if expectErr != testCase.expectErr {
-			t.Fatalf("case %v: expected: %v, got: %v", i+1, testCase.expectErr, expectErr)
-		}
-	}
-}
-
 func testAdminCmdRunnerServerInfo(t *testing.T, client adminCmdRunner) {
 	tmpGlobalBootTime := globalBootTime
 	tmpGlobalObjectAPI := globalObjectAPI
@@ -139,10 +109,8 @@ func testAdminCmdRunnerServerInfo(t *testing.T, client adminCmdRunner) {
 	}()
 
 	endpoints := new(EndpointList)
-	notificationSys, err := NewNotificationSys(globalServerConfig, *endpoints)
-	if err != nil {
-		t.Fatalf("unexpected error %v", err)
-	}
+
+	notificationSys := NewNotificationSys(globalServerConfig, *endpoints)
 
 	testCases := []struct {
 		bootTime        time.Time
@@ -199,81 +167,6 @@ func testAdminCmdRunnerGetConfig(t *testing.T, client adminCmdRunner) {
 	}
 }
 
-func testAdminCmdRunnerWriteTmpConfig(t *testing.T, client adminCmdRunner) {
-	tmpConfigDir := configDir
-	defer func() {
-		configDir = tmpConfigDir
-	}()
-
-	tempDir, err := ioutil.TempDir("", ".AdminCmdRunnerWriteTmpConfig.")
-	if err != nil {
-		t.Fatalf("unexpected error %v", err)
-	}
-	defer os.RemoveAll(tempDir)
-	configDir = &ConfigDir{dir: tempDir}
-
-	testCases := []struct {
-		tmpFilename string
-		configBytes []byte
-		expectErr   bool
-	}{
-		{"config1.json", []byte(`{"version":"23","region":"us-west-1a"}`), false},
-		// Overwrite test.
-		{"config1.json", []byte(`{"version":"23","region":"us-west-1a","browser":"on"}`), false},
-		{"config2.json", []byte{}, false},
-		{"config3.json", nil, false},
-	}
-
-	for i, testCase := range testCases {
-		err := client.WriteTmpConfig(testCase.tmpFilename, testCase.configBytes)
-		expectErr := (err != nil)
-
-		if expectErr != testCase.expectErr {
-			t.Fatalf("case %v: expected: %v, got: %v", i+1, testCase.expectErr, expectErr)
-		}
-	}
-}
-
-func testAdminCmdRunnerCommitConfig(t *testing.T, client adminCmdRunner) {
-	tmpConfigDir := configDir
-	defer func() {
-		configDir = tmpConfigDir
-	}()
-
-	tempDir, err := ioutil.TempDir("", ".AdminCmdRunnerCommitConfig.")
-	if err != nil {
-		t.Fatalf("unexpected error %v", err)
-	}
-	defer os.RemoveAll(tempDir)
-	configDir = &ConfigDir{dir: tempDir}
-	err = ioutil.WriteFile(filepath.Join(tempDir, "config.json"), []byte{}, os.ModePerm)
-	if err != nil {
-		t.Fatalf("unexpected error %v", err)
-	}
-
-	err = client.WriteTmpConfig("config1.json", []byte(`{"version":"23","region":"us-west-1a"}`))
-	if err != nil {
-		t.Fatalf("unexpected error %v", err)
-	}
-
-	testCases := []struct {
-		tmpFilename string
-		expectErr   bool
-	}{
-		{"config1.json", false},
-		{"config2.json", true},
-	}
-
-	for i, testCase := range testCases {
-		err := client.CommitConfig(testCase.tmpFilename)
-		expectErr := (err != nil)
-
-		if expectErr != testCase.expectErr {
-			t.Fatalf("case %v: expected: %v, got: %v", i+1, testCase.expectErr, expectErr)
-		}
-	}
-}
-
 func newAdminRPCHTTPServerClient(t *testing.T) (*httptest.Server, *AdminRPCClient, *serverConfig) {
 	rpcServer, err := NewAdminRPCServer()
 	if err != nil {
@@ -325,16 +218,6 @@ func TestAdminRPCClientReInitFormat(t *testing.T) {
 	testAdminCmdRunnerReInitFormat(t, rpcClient)
 }
 
-func TestAdminRPCClientListLocks(t *testing.T) {
-	httpServer, rpcClient, prevGlobalServerConfig := newAdminRPCHTTPServerClient(t)
-	defer httpServer.Close()
-	defer func() {
-		globalServerConfig = prevGlobalServerConfig
-	}()
-
-	testAdminCmdRunnerListLocks(t, rpcClient)
-}
-
 func TestAdminRPCClientServerInfo(t *testing.T) {
 	httpServer, rpcClient, prevGlobalServerConfig := newAdminRPCHTTPServerClient(t)
 	defer httpServer.Close()
@@ -354,260 +237,3 @@ func TestAdminRPCClientGetConfig(t *testing.T) {
 
 	testAdminCmdRunnerGetConfig(t, rpcClient)
 }
-
-func TestAdminRPCClientWriteTmpConfig(t *testing.T) {
-	httpServer, rpcClient, prevGlobalServerConfig := newAdminRPCHTTPServerClient(t)
-	defer httpServer.Close()
-	defer func() {
-		globalServerConfig = prevGlobalServerConfig
-	}()
-
-	testAdminCmdRunnerWriteTmpConfig(t, rpcClient)
-}
-
-func TestAdminRPCClientCommitConfig(t *testing.T) {
-	httpServer, rpcClient, prevGlobalServerConfig := newAdminRPCHTTPServerClient(t)
-	defer httpServer.Close()
-	defer func() {
-		globalServerConfig = prevGlobalServerConfig
-	}()
-
-	testAdminCmdRunnerCommitConfig(t, rpcClient)
-}
-
-var (
-	config1 = []byte(`{
-	"version": "13",
-	"credential": {
-		"accessKey": "minio",
-		"secretKey": "minio123"
-	},
-	"region": "us-east-1",
-	"logger": {
-		"console": {
-			"enable": true,
-			"level": "debug"
-		},
-		"file": {
-			"enable": false,
-			"fileName": "",
-			"level": ""
-		}
-	},
-	"notify": {
-		"amqp": {
-			"1": {
-				"enable": false,
-				"url": "",
-				"exchange": "",
-				"routingKey": "",
-				"exchangeType": "",
-				"mandatory": false,
-				"immediate": false,
-				"durable": false,
-				"internal": false,
-				"noWait": false,
-				"autoDeleted": false
-			}
-		},
-		"nats": {
-			"1": {
-				"enable": false,
-				"address": "",
-				"subject": "",
-				"username": "",
-				"password": "",
-				"token": "",
-				"secure": false,
-				"pingInterval": 0,
-				"streaming": {
-					"enable": false,
-					"clusterID": "",
-					"clientID": "",
-					"async": false,
-					"maxPubAcksInflight": 0
-				}
-			}
-		},
-		"elasticsearch": {
-			"1": {
-				"enable": false,
-				"url": "",
-				"index": ""
-			}
-		},
-		"redis": {
-			"1": {
-				"enable": false,
-				"address": "",
-				"password": "",
-				"key": ""
-			}
-		},
-		"postgresql": {
-			"1": {
-				"enable": false,
-				"connectionString": "",
-				"table": "",
-				"host": "",
-				"port": "",
-				"user": "",
-				"password": "",
-				"database": ""
-			}
-		},
-		"kafka": {
-			"1": {
-				"enable": false,
-				"brokers": null,
-				"topic": ""
-			}
-		},
-		"webhook": {
-			"1": {
-				"enable": false,
-				"endpoint": ""
-			}
-		}
-	}
-}
-`)
-	// diff from config1 - amqp.Enable is True
-	config2 = []byte(`{
-	"version": "13",
-	"credential": {
-		"accessKey": "minio",
-		"secretKey": "minio123"
-	},
-	"region": "us-east-1",
-	"logger": {
-		"console": {
-			"enable": true,
-			"level": "debug"
-		},
-		"file": {
-			"enable": false,
-			"fileName": "",
-			"level": ""
-		}
-	},
-	"notify": {
-		"amqp": {
-			"1": {
-				"enable": true,
-				"url": "",
-				"exchange": "",
-				"routingKey": "",
-				"exchangeType": "",
-				"mandatory": false,
-				"immediate": false,
-				"durable": false,
-				"internal": false,
-				"noWait": false,
-				"autoDeleted": false
-			}
-		},
-		"nats": {
-			"1": {
-				"enable": false,
-				"address": "",
-				"subject": "",
-				"username": "",
-				"password": "",
-				"token": "",
-				"secure": false,
-				"pingInterval": 0,
-				"streaming": {
-					"enable": false,
-					"clusterID": "",
-					"clientID": "",
-					"async": false,
-					"maxPubAcksInflight": 0
-				}
-			}
-		},
-		"elasticsearch": {
-			"1": {
-				"enable": false,
-				"url": "",
-				"index": ""
-			}
-		},
-		"redis": {
-			"1": {
-				"enable": false,
-				"address": "",
-				"password": "",
-				"key": ""
-			}
-		},
-		"postgresql": {
-			"1": {
-				"enable": false,
-				"connectionString": "",
-				"table": "",
-				"host": "",
-				"port": "",
-				"user": "",
-				"password": "",
-				"database": ""
-			}
-		},
-		"kafka": {
-			"1": {
-				"enable": false,
-				"brokers": null,
-				"topic": ""
-			}
-		},
-		"webhook": {
-			"1": {
-				"enable": false,
-				"endpoint": ""
-			}
-		}
-	}
-}
-`)
-)
-
-// TestGetValidServerConfig - test for getValidServerConfig.
-func TestGetValidServerConfig(t *testing.T) {
-	var c1, c2 serverConfig
-	err := json.Unmarshal(config1, &c1)
-	if err != nil {
-		t.Fatalf("json unmarshal of %s failed: %v", string(config1), err)
-	}
-
-	err = json.Unmarshal(config2, &c2)
-	if err != nil {
-		t.Fatalf("json unmarshal of %s failed: %v", string(config2), err)
-	}
-
-	// Valid config.
-	noErrs := []error{nil, nil, nil, nil}
-	serverConfigs := []serverConfig{c1, c2, c1, c1}
-	validConfig, err := getValidServerConfig(serverConfigs, noErrs)
-	if err != nil {
-		t.Errorf("Expected a valid config but received %v instead", err)
-	}
-
-	if !reflect.DeepEqual(validConfig, c1) {
-		t.Errorf("Expected valid config to be %v but received %v", config1, validConfig)
-	}
-
-	// Invalid config - no quorum.
-	serverConfigs = []serverConfig{c1, c2, c2, c1}
-	_, err = getValidServerConfig(serverConfigs, noErrs)
-	if err != errXLWriteQuorum {
-		t.Errorf("Expected to fail due to lack of quorum but received %v", err)
-	}
-
-	// All errors
-	allErrs := []error{errDiskNotFound, errDiskNotFound, errDiskNotFound, errDiskNotFound}
-	serverConfigs = []serverConfig{{}, {}, {}, {}}
-	_, err = getValidServerConfig(serverConfigs, allErrs)
-	if err != errXLWriteQuorum {
-		t.Errorf("Expected to fail due to lack of quorum but received %v", err)
-	}
-}

cmd/api-datatypes.go

@@ -25,6 +25,87 @@ const (
 	responseRequestIDKey = "x-amz-request-id"
 )
 
+// CSVFileHeaderInfo -Can be either USE IGNORE OR NONE, defines what to do with
+// the first row
+type CSVFileHeaderInfo string
+
+// Constants for file header info.
+const (
+	CSVFileHeaderInfoNone   CSVFileHeaderInfo = "NONE"
+	CSVFileHeaderInfoIgnore                   = "IGNORE"
+	CSVFileHeaderInfoUse                      = "USE"
+)
+
+// SelectCompressionType - ONLY GZIP is supported
+type SelectCompressionType string
+
+// Constants for compression types under select API.
+const (
+	SelectCompressionNONE SelectCompressionType = "NONE"
+	SelectCompressionGZIP                       = "GZIP"
+	SelectCompressionBZIP                       = "BZIP2"
+)
+
+// CSVQuoteFields - Can be either Always or AsNeeded
+type CSVQuoteFields string
+
+// Constants for csv quote styles.
+const (
+	CSVQuoteFieldsAlways   CSVQuoteFields = "Always"
+	CSVQuoteFieldsAsNeeded                = "AsNeeded"
+)
+
+// QueryExpressionType - Currently can only be SQL
+type QueryExpressionType string
+
+// Constants for expression type.
+const (
+	QueryExpressionTypeSQL QueryExpressionType = "SQL"
+)
+
+// JSONType determines json input serialization type.
+type JSONType string
+
+// Constants for JSONTypes.
+const (
+	JSONDocumentType JSONType = "Document"
+	JSONStreamType            = "Stream"
+	JSONLinesType             = "Lines"
+)
+
+// ObjectSelectRequest - represents the input select body
+type ObjectSelectRequest struct {
+	XMLName            xml.Name `xml:"SelectObjectContentRequest" json:"-"`
+	Expression         string
+	ExpressionType     QueryExpressionType
+	InputSerialization struct {
+		CompressionType SelectCompressionType
+		CSV             *struct {
+			FileHeaderInfo       CSVFileHeaderInfo
+			RecordDelimiter      string
+			FieldDelimiter       string
+			QuoteCharacter       string
+			QuoteEscapeCharacter string
+			Comments             string
+		}
+		JSON *struct {
+			Type JSONType
+		}
+	}
+	OutputSerialization struct {
+		CSV *struct {
+			QuoteFields          CSVQuoteFields
+			RecordDelimiter      string
+			FieldDelimiter       string
+			QuoteCharacter       string
+			QuoteEscapeCharacter string
+		}
+		JSON *struct {
+			RecordDelimiter string
+		}
+	}
+}
+
 // ObjectIdentifier carries key name for the object to delete.
 type ObjectIdentifier struct {
 	ObjectName string `xml:"Key"`

cmd/api-errors.go

@@ -17,13 +17,17 @@
 package cmd
 
 import (
+	"context"
 	"encoding/xml"
 	"fmt"
 	"net/http"
 
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/pkg/auth"
+	"github.com/minio/minio/pkg/dns"
 	"github.com/minio/minio/pkg/event"
 	"github.com/minio/minio/pkg/hash"
+	"github.com/minio/minio/pkg/s3select"
 )
 
 // APIError structure
@@ -38,8 +42,8 @@ type APIErrorResponse struct {
 	XMLName    xml.Name `xml:"Error" json:"-"`
 	Code       string
 	Message    string
-	Key        string
-	BucketName string
+	Key        string `xml:"Key,omitempty" json:"Key,omitempty"`
+	BucketName string `xml:"BucketName,omitempty" json:"BucketName,omitempty"`
 	Resource   string
 	RequestID  string `xml:"RequestId" json:"RequestId"`
 	HostID     string `xml:"HostId" json:"HostId"`
@@ -127,6 +131,9 @@ const (
 	ErrInvalidPrefixMarker
 	// Add new error codes here.
 
+	// SSE-S3 related API errors
+	ErrInvalidEncryptionMethod
+
 	// Server-Side-Encryption (with Customer provided key) related API errors.
 	ErrInsecureSSECustomerRequest
 	ErrSSEMultipartEncrypted
@@ -138,6 +145,9 @@ const (
 	ErrMissingSSECustomerKeyMD5
 	ErrSSECustomerKeyMD5Mismatch
 	ErrInvalidSSECustomerParameters
+	ErrIncompatibleEncryptionMethod
+	ErrKMSNotConfigured
+	ErrKMSAuthFailure
 
 	// Bucket notification related errors.
 	ErrEventNotification
@@ -167,7 +177,6 @@ const (
 	ErrInvalidResourceName
 	ErrServerNotInitialized
 	ErrOperationTimedOut
-	ErrPartsSizeUnequal
 	ErrInvalidRequest
 	// Minio storage class error codes
 	ErrInvalidStorageClass
@@ -185,12 +194,101 @@ const (
 	ErrAdminCredentialsMismatch
 	ErrInsecureClientRequest
 	ErrObjectTampered
+
 	ErrHealNotImplemented
 	ErrHealNoSuchProcess
 	ErrHealInvalidClientToken
 	ErrHealMissingBucket
 	ErrHealAlreadyRunning
 	ErrHealOverlappingPaths
+	ErrIncorrectContinuationToken
+
+	//S3 Select Errors
+	ErrEmptyRequestBody
+	ErrUnsupportedFunction
+	ErrInvalidExpressionType
+	ErrBusy
+	ErrUnauthorizedAccess
+	ErrExpressionTooLong
+	ErrIllegalSQLFunctionArgument
+	ErrInvalidKeyPath
+	ErrInvalidCompressionFormat
+	ErrInvalidFileHeaderInfo
+	ErrInvalidJSONType
+	ErrInvalidQuoteFields
+	ErrInvalidRequestParameter
+	ErrInvalidDataType
+	ErrInvalidTextEncoding
+	ErrInvalidDataSource
+	ErrInvalidTableAlias
+	ErrMissingRequiredParameter
+	ErrObjectSerializationConflict
+	ErrUnsupportedSQLOperation
+	ErrUnsupportedSQLStructure
+	ErrUnsupportedSyntax
+	ErrUnsupportedRangeHeader
+	ErrLexerInvalidChar
+	ErrLexerInvalidOperator
+	ErrLexerInvalidLiteral
+	ErrLexerInvalidIONLiteral
+	ErrParseExpectedDatePart
+	ErrParseExpectedKeyword
+	ErrParseExpectedTokenType
+	ErrParseExpected2TokenTypes
+	ErrParseExpectedNumber
+	ErrParseExpectedRightParenBuiltinFunctionCall
+	ErrParseExpectedTypeName
+	ErrParseExpectedWhenClause
+	ErrParseUnsupportedToken
+	ErrParseUnsupportedLiteralsGroupBy
+	ErrParseExpectedMember
+	ErrParseUnsupportedSelect
+	ErrParseUnsupportedCase
+	ErrParseUnsupportedCaseClause
+	ErrParseUnsupportedAlias
+	ErrParseUnsupportedSyntax
+	ErrParseUnknownOperator
+	ErrParseInvalidPathComponent
+	ErrParseMissingIdentAfterAt
+	ErrParseUnexpectedOperator
+	ErrParseUnexpectedTerm
+	ErrParseUnexpectedToken
+	ErrParseUnexpectedKeyword
+	ErrParseExpectedExpression
+	ErrParseExpectedLeftParenAfterCast
+	ErrParseExpectedLeftParenValueConstructor
+	ErrParseExpectedLeftParenBuiltinFunctionCall
+	ErrParseExpectedArgumentDelimiter
+	ErrParseCastArity
+	ErrParseInvalidTypeParam
+	ErrParseEmptySelect
+	ErrParseSelectMissingFrom
+	ErrParseExpectedIdentForGroupName
+	ErrParseExpectedIdentForAlias
+	ErrParseUnsupportedCallWithStar
+	ErrParseNonUnaryAgregateFunctionCall
+	ErrParseMalformedJoin
+	ErrParseExpectedIdentForAt
+	ErrParseAsteriskIsNotAloneInSelectList
+	ErrParseCannotMixSqbAndWildcardInSelectList
+	ErrParseInvalidContextForWildcardInSelectList
+	ErrIncorrectSQLFunctionArgumentType
+	ErrValueParseFailure
+	ErrEvaluatorInvalidArguments
+	ErrIntegerOverflow
+	ErrLikeInvalidInputs
+	ErrCastFailed
+	ErrInvalidCast
+	ErrEvaluatorInvalidTimestampFormatPattern
+	ErrEvaluatorInvalidTimestampFormatPatternSymbolForParsing
+	ErrEvaluatorTimestampFormatPatternDuplicateFields
+	ErrEvaluatorTimestampFormatPatternHourClockAmPmMismatch
+	ErrEvaluatorUnterminatedTimestampFormatPatternToken
+	ErrEvaluatorInvalidTimestampFormatPatternToken
+	ErrEvaluatorInvalidTimestampFormatPatternSymbol
+	ErrEvaluatorBindingDoesNotExist
+	ErrInvalidColumnIndex
+	ErrMissingHeaders
 )
 
 // error code to APIError structure, these fields carry respective
@@ -627,6 +725,11 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "Your metadata headers exceed the maximum allowed metadata size.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrInvalidEncryptionMethod: {
+		Code:           "InvalidRequest",
+		Description:    "The encryption method specified is not supported",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrInsecureSSECustomerRequest: {
 		Code:           "InvalidRequest",
 		Description:    "Requests specifying Server Side Encryption with Customer provided keys must be made over a secure connection.",
@@ -677,6 +780,21 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "The provided encryption parameters did not match the ones used originally.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrIncompatibleEncryptionMethod: {
+		Code:           "InvalidArgument",
+		Description:    "Server side encryption specified with both SSE-C and SSE-S3 headers",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrKMSNotConfigured: {
+		Code:           "InvalidArgument",
+		Description:    "Server side encryption specified but KMS is not configured",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrKMSAuthFailure: {
+		Code:           "InvalidArgument",
+		Description:    "Server side encryption specified but KMS authorization failed",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 
 	/// S3 extensions.
 	ErrContentSHA256Mismatch: {
@@ -689,7 +807,7 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	ErrStorageFull: {
 		Code:           "XMinioStorageFull",
 		Description:    "Storage backend has reached its minimum free disk threshold. Please delete a few objects to proceed.",
-		HTTPStatusCode: http.StatusInternalServerError,
+		HTTPStatusCode: http.StatusInsufficientStorage,
 	},
 	ErrRequestBodyParse: {
 		Code:           "XMinioRequestBodyParse",
@@ -782,11 +900,6 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "Your metadata headers are not supported.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
-	ErrPartsSizeUnequal: {
-		Code:           "XMinioPartsSizeUnequal",
-		Description:    "All parts except the last part should be of the same size.",
-		HTTPStatusCode: http.StatusBadRequest,
-	},
 	ErrObjectTampered: {
 		Code:           "XMinioObjectTampered",
 		Description:    errObjectTampered.Error(),
@@ -797,6 +910,7 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "X-Amz-Expires must be less than a week (in seconds); that is, the given X-Amz-Expires must be less than 604800 seconds",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+
 	// Generic Invalid-Request error. Should be used for response errors only for unlikely
 	// corner case errors for which introducing new APIErrorCode is not worth it. LogIf()
 	// should be used to log the error at the source of the error for debugging purposes.
@@ -840,7 +954,437 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "Object storage backend is unreachable",
 		HTTPStatusCode: http.StatusServiceUnavailable,
 	},
-
+	ErrIncorrectContinuationToken: {
+		Code:           "InvalidArgument",
+		Description:    "The continuation token provided is incorrect",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	//S3 Select API Errors
+	ErrEmptyRequestBody: {
+		Code:           "EmptyRequestBody",
+		Description:    "Request body cannot be empty.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrUnsupportedFunction: {
+		Code:           "UnsupportedFunction",
+		Description:    "Encountered an unsupported SQL function.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidDataSource: {
+		Code:           "InvalidDataSource",
+		Description:    "Invalid data source type. Only CSV and JSON are supported at this time.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidExpressionType: {
+		Code:           "InvalidExpressionType",
+		Description:    "The ExpressionType is invalid. Only SQL expressions are supported at this time.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrBusy: {
+		Code:           "Busy",
+		Description:    "The service is unavailable. Please retry.",
+		HTTPStatusCode: http.StatusServiceUnavailable,
+	},
+	ErrUnauthorizedAccess: {
+		Code:           "UnauthorizedAccess",
+		Description:    "You are not authorized to perform this operation",
+		HTTPStatusCode: http.StatusUnauthorized,
+	},
+	ErrExpressionTooLong: {
+		Code:           "ExpressionTooLong",
+		Description:    "The SQL expression is too long: The maximum byte-length for the SQL expression is 256 KB.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrIllegalSQLFunctionArgument: {
+		Code:           "IllegalSqlFunctionArgument",
+		Description:    "Illegal argument was used in the SQL function.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidKeyPath: {
+		Code:           "InvalidKeyPath",
+		Description:    "Key path in the SQL expression is invalid.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidCompressionFormat: {
+		Code:           "InvalidCompressionFormat",
+		Description:    "The file is not in a supported compression format. Only GZIP is supported at this time.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidFileHeaderInfo: {
+		Code:           "InvalidFileHeaderInfo",
+		Description:    "The FileHeaderInfo is invalid. Only NONE, USE, and IGNORE are supported.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidJSONType: {
+		Code:           "InvalidJsonType",
+		Description:    "The JsonType is invalid. Only DOCUMENT and LINES are supported at this time.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidQuoteFields: {
+		Code:           "InvalidQuoteFields",
+		Description:    "The QuoteFields is invalid. Only ALWAYS and ASNEEDED are supported.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidRequestParameter: {
+		Code:           "InvalidRequestParameter",
+		Description:    "The value of a parameter in SelectRequest element is invalid. Check the service API documentation and try again.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidDataType: {
+		Code:           "InvalidDataType",
+		Description:    "The SQL expression contains an invalid data type.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidTextEncoding: {
+		Code:           "InvalidTextEncoding",
+		Description:    "Invalid encoding type. Only UTF-8 encoding is supported at this time.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidTableAlias: {
+		Code:           "InvalidTableAlias",
+		Description:    "The SQL expression contains an invalid table alias.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrMissingRequiredParameter: {
+		Code:           "MissingRequiredParameter",
+		Description:    "The SelectRequest entity is missing a required parameter. Check the service documentation and try again.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrObjectSerializationConflict: {
+		Code:           "ObjectSerializationConflict",
+		Description:    "The SelectRequest entity can only contain one of CSV or JSON. Check the service documentation and try again.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrUnsupportedSQLOperation: {
+		Code:           "UnsupportedSqlOperation",
+		Description:    "Encountered an unsupported SQL operation.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrUnsupportedSQLStructure: {
+		Code:           "UnsupportedSqlStructure",
+		Description:    "Encountered an unsupported SQL structure. Check the SQL Reference.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrUnsupportedSyntax: {
+		Code:           "UnsupportedSyntax",
+		Description:    "Encountered invalid syntax.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrUnsupportedRangeHeader: {
+		Code:           "UnsupportedRangeHeader",
+		Description:    "Range header is not supported for this operation.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrLexerInvalidChar: {
+		Code:           "LexerInvalidChar",
+		Description:    "The SQL expression contains an invalid character.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrLexerInvalidOperator: {
+		Code:           "LexerInvalidOperator",
+		Description:    "The SQL expression contains an invalid literal.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrLexerInvalidLiteral: {
+		Code:           "LexerInvalidLiteral",
+		Description:    "The SQL expression contains an invalid operator.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrLexerInvalidIONLiteral: {
+		Code:           "LexerInvalidIONLiteral",
+		Description:    "The SQL expression contains an invalid operator.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedDatePart: {
+		Code:           "ParseExpectedDatePart",
+		Description:    "Did not find the expected date part in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedKeyword: {
+		Code:           "ParseExpectedKeyword",
+		Description:    "Did not find the expected keyword in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedTokenType: {
+		Code:           "ParseExpectedTokenType",
+		Description:    "Did not find the expected token in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpected2TokenTypes: {
+		Code:           "ParseExpected2TokenTypes",
+		Description:    "Did not find the expected token in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedNumber: {
+		Code:           "ParseExpectedNumber",
+		Description:    "Did not find the expected number in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedRightParenBuiltinFunctionCall: {
+		Code:           "ParseExpectedRightParenBuiltinFunctionCall",
+		Description:    "Did not find the expected right parenthesis character in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedTypeName: {
+		Code:           "ParseExpectedTypeName",
+		Description:    "Did not find the expected type name in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedWhenClause: {
+		Code:           "ParseExpectedWhenClause",
+		Description:    "Did not find the expected WHEN clause in the SQL expression. CASE is not supported.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedToken: {
+		Code:           "ParseUnsupportedToken",
+		Description:    "The SQL expression contains an unsupported token.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedLiteralsGroupBy: {
+		Code:           "ParseUnsupportedLiteralsGroupBy",
+		Description:    "The SQL expression contains an unsupported use of GROUP BY.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedMember: {
+		Code:           "ParseExpectedMember",
+		Description:    "The SQL expression contains an unsupported use of MEMBER.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedSelect: {
+		Code:           "ParseUnsupportedSelect",
+		Description:    "The SQL expression contains an unsupported use of SELECT.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedCase: {
+		Code:           "ParseUnsupportedCase",
+		Description:    "The SQL expression contains an unsupported use of CASE.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedCaseClause: {
+		Code:           "ParseUnsupportedCaseClause",
+		Description:    "The SQL expression contains an unsupported use of CASE.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedAlias: {
+		Code:           "ParseUnsupportedAlias",
+		Description:    "The SQL expression contains an unsupported use of ALIAS.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedSyntax: {
+		Code:           "ParseUnsupportedSyntax",
+		Description:    "The SQL expression contains unsupported syntax.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnknownOperator: {
+		Code:           "ParseUnknownOperator",
+		Description:    "The SQL expression contains an invalid operator.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseInvalidPathComponent: {
+		Code:           "ParseInvalidPathComponent",
+		Description:    "The SQL expression contains an invalid path component.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseMissingIdentAfterAt: {
+		Code:           "ParseMissingIdentAfterAt",
+		Description:    "Did not find the expected identifier after the @ symbol in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnexpectedOperator: {
+		Code:           "ParseUnexpectedOperator",
+		Description:    "The SQL expression contains an unexpected operator.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnexpectedTerm: {
+		Code:           "ParseUnexpectedTerm",
+		Description:    "The SQL expression contains an unexpected term.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnexpectedToken: {
+		Code:           "ParseUnexpectedToken",
+		Description:    "The SQL expression contains an unexpected token.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnexpectedKeyword: {
+		Code:           "ParseUnexpectedKeyword",
+		Description:    "The SQL expression contains an unexpected keyword.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedExpression: {
+		Code:           "ParseExpectedExpression",
+		Description:    "Did not find the expected SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedLeftParenAfterCast: {
+		Code:           "ParseExpectedLeftParenAfterCast",
+		Description:    "Did not find expected the left parenthesis in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedLeftParenValueConstructor: {
+		Code:           "ParseExpectedLeftParenValueConstructor",
+		Description:    "Did not find expected the left parenthesis in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedLeftParenBuiltinFunctionCall: {
+		Code:           "ParseExpectedLeftParenBuiltinFunctionCall",
+		Description:    "Did not find the expected left parenthesis in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedArgumentDelimiter: {
+		Code:           "ParseExpectedArgumentDelimiter",
+		Description:    "Did not find the expected argument delimiter in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseCastArity: {
+		Code:           "ParseCastArity",
+		Description:    "The SQL expression CAST has incorrect arity.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseInvalidTypeParam: {
+		Code:           "ParseInvalidTypeParam",
+		Description:    "The SQL expression contains an invalid parameter value.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseEmptySelect: {
+		Code:           "ParseEmptySelect",
+		Description:    "The SQL expression contains an empty SELECT.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseSelectMissingFrom: {
+		Code:           "ParseSelectMissingFrom",
+		Description:    "GROUP is not supported in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedIdentForGroupName: {
+		Code:           "ParseExpectedIdentForGroupName",
+		Description:    "GROUP is not supported in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedIdentForAlias: {
+		Code:           "ParseExpectedIdentForAlias",
+		Description:    "Did not find the expected identifier for the alias in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseUnsupportedCallWithStar: {
+		Code:           "ParseUnsupportedCallWithStar",
+		Description:    "Only COUNT with (*) as a parameter is supported in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseNonUnaryAgregateFunctionCall: {
+		Code:           "ParseNonUnaryAgregateFunctionCall",
+		Description:    "Only one argument is supported for aggregate functions in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseMalformedJoin: {
+		Code:           "ParseMalformedJoin",
+		Description:    "JOIN is not supported in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseExpectedIdentForAt: {
+		Code:           "ParseExpectedIdentForAt",
+		Description:    "Did not find the expected identifier for AT name in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseAsteriskIsNotAloneInSelectList: {
+		Code:           "ParseAsteriskIsNotAloneInSelectList",
+		Description:    "Other expressions are not allowed in the SELECT list when '*' is used without dot notation in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseCannotMixSqbAndWildcardInSelectList: {
+		Code:           "ParseCannotMixSqbAndWildcardInSelectList",
+		Description:    "Cannot mix [] and * in the same expression in a SELECT list in SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrParseInvalidContextForWildcardInSelectList: {
+		Code:           "ParseInvalidContextForWildcardInSelectList",
+		Description:    "Invalid use of * in SELECT list in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrIncorrectSQLFunctionArgumentType: {
+		Code:           "IncorrectSqlFunctionArgumentType",
+		Description:    "Incorrect type of arguments in function call in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrValueParseFailure: {
+		Code:           "ValueParseFailure",
+		Description:    "Time stamp parse failure in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorInvalidArguments: {
+		Code:           "EvaluatorInvalidArguments",
+		Description:    "Incorrect number of arguments in the function call in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrIntegerOverflow: {
+		Code:           "IntegerOverflow",
+		Description:    "Int overflow or underflow in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrLikeInvalidInputs: {
+		Code:           "LikeInvalidInputs",
+		Description:    "Invalid argument given to the LIKE clause in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrCastFailed: {
+		Code:           "CastFailed",
+		Description:    "Attempt to convert from one data type to another using CAST failed in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidCast: {
+		Code:           "InvalidCast",
+		Description:    "Attempt to convert from one data type to another using CAST failed in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorInvalidTimestampFormatPattern: {
+		Code:           "EvaluatorInvalidTimestampFormatPattern",
+		Description:    "Time stamp format pattern requires additional fields in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorInvalidTimestampFormatPatternSymbolForParsing: {
+		Code:           "EvaluatorInvalidTimestampFormatPatternSymbolForParsing",
+		Description:    "Time stamp format pattern contains a valid format symbol that cannot be applied to time stamp parsing in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorTimestampFormatPatternDuplicateFields: {
+		Code:           "EvaluatorTimestampFormatPatternDuplicateFields",
+		Description:    "Time stamp format pattern contains multiple format specifiers representing the time stamp field in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorTimestampFormatPatternHourClockAmPmMismatch: {
+		Code:           "EvaluatorUnterminatedTimestampFormatPatternToken",
+		Description:    "Time stamp format pattern contains unterminated token in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorUnterminatedTimestampFormatPatternToken: {
+		Code:           "EvaluatorInvalidTimestampFormatPatternToken",
+		Description:    "Time stamp format pattern contains an invalid token in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorInvalidTimestampFormatPatternToken: {
+		Code:           "EvaluatorInvalidTimestampFormatPatternToken",
+		Description:    "Time stamp format pattern contains an invalid token in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorInvalidTimestampFormatPatternSymbol: {
+		Code:           "EvaluatorInvalidTimestampFormatPatternSymbol",
+		Description:    "Time stamp format pattern contains an invalid symbol in the SQL expression.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrInvalidColumnIndex: {
+		Code:           "InvalidColumnIndex",
+		Description:    "Column index in the SQL expression is invalid.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrEvaluatorBindingDoesNotExist: {
+		Code:           "ErrEvaluatorBindingDoesNotExist",
+		Description:    "A column name or a path provided does not exist in the SQL expression",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrMissingHeaders: {
+		Code:           "MissingHeaders",
+		Description:    "Some headers in the query are missing from the file. Check the file and try again.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	// Add your error structure here.
 }
 
@@ -864,6 +1408,200 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		apiErr = ErrAdminInvalidAccessKey
 	case auth.ErrInvalidSecretKeyLength:
 		apiErr = ErrAdminInvalidSecretKey
+	// SSE errors
+	case crypto.ErrInvalidEncryptionMethod:
+		apiErr = ErrInvalidEncryptionMethod
+	case errInsecureSSERequest:
+		apiErr = ErrInsecureSSECustomerRequest
+	case crypto.ErrInvalidCustomerAlgorithm:
+		apiErr = ErrInvalidSSECustomerAlgorithm
+	case crypto.ErrInvalidCustomerKey:
+		apiErr = ErrInvalidSSECustomerKey
+	case crypto.ErrMissingCustomerKey:
+		apiErr = ErrMissingSSECustomerKey
+	case crypto.ErrMissingCustomerKeyMD5:
+		apiErr = ErrMissingSSECustomerKeyMD5
+	case crypto.ErrCustomerKeyMD5Mismatch:
+		apiErr = ErrSSECustomerKeyMD5Mismatch
+	case errObjectTampered:
+		apiErr = ErrObjectTampered
+	case errEncryptedObject:
+		apiErr = ErrSSEEncryptedObject
+	case errInvalidSSEParameters:
+		apiErr = ErrInvalidSSECustomerParameters
+	case crypto.ErrInvalidCustomerKey:
+		apiErr = ErrAccessDenied // no access without correct key
+	case crypto.ErrIncompatibleEncryptionMethod:
+		apiErr = ErrIncompatibleEncryptionMethod
+	case errKMSNotConfigured:
+		apiErr = ErrKMSNotConfigured
+	case crypto.ErrKMSAuthLogin:
+		apiErr = ErrKMSAuthFailure
+	case context.Canceled, context.DeadlineExceeded:
+		apiErr = ErrOperationTimedOut
+	}
+	switch err {
+	case s3select.ErrBusy:
+		apiErr = ErrBusy
+	case s3select.ErrUnauthorizedAccess:
+		apiErr = ErrUnauthorizedAccess
+	case s3select.ErrExpressionTooLong:
+		apiErr = ErrExpressionTooLong
+	case s3select.ErrIllegalSQLFunctionArgument:
+		apiErr = ErrIllegalSQLFunctionArgument
+	case s3select.ErrInvalidKeyPath:
+		apiErr = ErrInvalidKeyPath
+	case s3select.ErrInvalidCompressionFormat:
+		apiErr = ErrInvalidCompressionFormat
+	case s3select.ErrInvalidFileHeaderInfo:
+		apiErr = ErrInvalidFileHeaderInfo
+	case s3select.ErrInvalidJSONType:
+		apiErr = ErrInvalidJSONType
+	case s3select.ErrInvalidQuoteFields:
+		apiErr = ErrInvalidQuoteFields
+	case s3select.ErrInvalidRequestParameter:
+		apiErr = ErrInvalidRequestParameter
+	case s3select.ErrInvalidDataType:
+		apiErr = ErrInvalidDataType
+	case s3select.ErrInvalidTextEncoding:
+		apiErr = ErrInvalidTextEncoding
+	case s3select.ErrInvalidTableAlias:
+		apiErr = ErrInvalidTableAlias
+	case s3select.ErrMissingRequiredParameter:
+		apiErr = ErrMissingRequiredParameter
+	case s3select.ErrObjectSerializationConflict:
+		apiErr = ErrObjectSerializationConflict
+	case s3select.ErrUnsupportedSQLOperation:
+		apiErr = ErrUnsupportedSQLOperation
+	case s3select.ErrUnsupportedSQLStructure:
+		apiErr = ErrUnsupportedSQLStructure
+	case s3select.ErrUnsupportedSyntax:
+		apiErr = ErrUnsupportedSyntax
+	case s3select.ErrUnsupportedRangeHeader:
+		apiErr = ErrUnsupportedRangeHeader
+	case s3select.ErrLexerInvalidChar:
+		apiErr = ErrLexerInvalidChar
+	case s3select.ErrLexerInvalidOperator:
+		apiErr = ErrLexerInvalidOperator
+	case s3select.ErrLexerInvalidLiteral:
+		apiErr = ErrLexerInvalidLiteral
+	case s3select.ErrLexerInvalidIONLiteral:
+		apiErr = ErrLexerInvalidIONLiteral
+	case s3select.ErrParseExpectedDatePart:
+		apiErr = ErrParseExpectedDatePart
+	case s3select.ErrParseExpectedKeyword:
+		apiErr = ErrParseExpectedKeyword
+	case s3select.ErrParseExpectedTokenType:
+		apiErr = ErrParseExpectedTokenType
+	case s3select.ErrParseExpected2TokenTypes:
+		apiErr = ErrParseExpected2TokenTypes
+	case s3select.ErrParseExpectedNumber:
+		apiErr = ErrParseExpectedNumber
+	case s3select.ErrParseExpectedRightParenBuiltinFunctionCall:
+		apiErr = ErrParseExpectedRightParenBuiltinFunctionCall
+	case s3select.ErrParseExpectedTypeName:
+		apiErr = ErrParseExpectedTypeName
+	case s3select.ErrParseExpectedWhenClause:
+		apiErr = ErrParseExpectedWhenClause
+	case s3select.ErrParseUnsupportedToken:
+		apiErr = ErrParseUnsupportedToken
+	case s3select.ErrParseUnsupportedLiteralsGroupBy:
+		apiErr = ErrParseUnsupportedLiteralsGroupBy
+	case s3select.ErrParseExpectedMember:
+		apiErr = ErrParseExpectedMember
+	case s3select.ErrParseUnsupportedSelect:
+		apiErr = ErrParseUnsupportedSelect
+	case s3select.ErrParseUnsupportedCase:
+		apiErr = ErrParseUnsupportedCase
+	case s3select.ErrParseUnsupportedCaseClause:
+		apiErr = ErrParseUnsupportedCaseClause
+	case s3select.ErrParseUnsupportedAlias:
+		apiErr = ErrParseUnsupportedAlias
+	case s3select.ErrParseUnsupportedSyntax:
+		apiErr = ErrParseUnsupportedSyntax
+	case s3select.ErrParseUnknownOperator:
+		apiErr = ErrParseUnknownOperator
+	case s3select.ErrParseInvalidPathComponent:
+		apiErr = ErrParseInvalidPathComponent
+	case s3select.ErrParseMissingIdentAfterAt:
+		apiErr = ErrParseMissingIdentAfterAt
+	case s3select.ErrParseUnexpectedOperator:
+		apiErr = ErrParseUnexpectedOperator
+	case s3select.ErrParseUnexpectedTerm:
+		apiErr = ErrParseUnexpectedTerm
+	case s3select.ErrParseUnexpectedToken:
+		apiErr = ErrParseUnexpectedToken
+	case s3select.ErrParseUnexpectedKeyword:
+		apiErr = ErrParseUnexpectedKeyword
+	case s3select.ErrParseExpectedExpression:
+		apiErr = ErrParseExpectedExpression
+	case s3select.ErrParseExpectedLeftParenAfterCast:
+		apiErr = ErrParseExpectedLeftParenAfterCast
+	case s3select.ErrParseExpectedLeftParenValueConstructor:
+		apiErr = ErrParseExpectedLeftParenValueConstructor
+	case s3select.ErrParseExpectedLeftParenBuiltinFunctionCall:
+		apiErr = ErrParseExpectedLeftParenBuiltinFunctionCall
+	case s3select.ErrParseExpectedArgumentDelimiter:
+		apiErr = ErrParseExpectedArgumentDelimiter
+	case s3select.ErrParseCastArity:
+		apiErr = ErrParseCastArity
+	case s3select.ErrParseInvalidTypeParam:
+		apiErr = ErrParseInvalidTypeParam
+	case s3select.ErrParseEmptySelect:
+		apiErr = ErrParseEmptySelect
+	case s3select.ErrParseSelectMissingFrom:
+		apiErr = ErrParseSelectMissingFrom
+	case s3select.ErrParseExpectedIdentForGroupName:
+		apiErr = ErrParseExpectedIdentForGroupName
+	case s3select.ErrParseExpectedIdentForAlias:
+		apiErr = ErrParseExpectedIdentForAlias
+	case s3select.ErrParseUnsupportedCallWithStar:
+		apiErr = ErrParseUnsupportedCallWithStar
+	case s3select.ErrParseNonUnaryAgregateFunctionCall:
+		apiErr = ErrParseNonUnaryAgregateFunctionCall
+	case s3select.ErrParseMalformedJoin:
+		apiErr = ErrParseMalformedJoin
+	case s3select.ErrParseExpectedIdentForAt:
+		apiErr = ErrParseExpectedIdentForAt
+	case s3select.ErrParseAsteriskIsNotAloneInSelectList:
+		apiErr = ErrParseAsteriskIsNotAloneInSelectList
+	case s3select.ErrParseCannotMixSqbAndWildcardInSelectList:
+		apiErr = ErrParseCannotMixSqbAndWildcardInSelectList
+	case s3select.ErrParseInvalidContextForWildcardInSelectList:
+		apiErr = ErrParseInvalidContextForWildcardInSelectList
+	case s3select.ErrIncorrectSQLFunctionArgumentType:
+		apiErr = ErrIncorrectSQLFunctionArgumentType
+	case s3select.ErrValueParseFailure:
+		apiErr = ErrValueParseFailure
+	case s3select.ErrIntegerOverflow:
+		apiErr = ErrIntegerOverflow
+	case s3select.ErrLikeInvalidInputs:
+		apiErr = ErrLikeInvalidInputs
+	case s3select.ErrCastFailed:
+		apiErr = ErrCastFailed
+	case s3select.ErrInvalidCast:
+		apiErr = ErrInvalidCast
+	case s3select.ErrEvaluatorInvalidTimestampFormatPattern:
+		apiErr = ErrEvaluatorInvalidTimestampFormatPattern
+	case s3select.ErrEvaluatorInvalidTimestampFormatPatternSymbolForParsing:
+		apiErr = ErrEvaluatorInvalidTimestampFormatPatternSymbolForParsing
+	case s3select.ErrEvaluatorTimestampFormatPatternDuplicateFields:
+		apiErr = ErrEvaluatorTimestampFormatPatternDuplicateFields
+	case s3select.ErrEvaluatorTimestampFormatPatternHourClockAmPmMismatch:
+		apiErr = ErrEvaluatorTimestampFormatPatternHourClockAmPmMismatch
+	case s3select.ErrEvaluatorUnterminatedTimestampFormatPatternToken:
+		apiErr = ErrEvaluatorUnterminatedTimestampFormatPatternToken
+	case s3select.ErrEvaluatorInvalidTimestampFormatPatternToken:
+		apiErr = ErrEvaluatorInvalidTimestampFormatPatternToken
+	case s3select.ErrEvaluatorInvalidTimestampFormatPatternSymbol:
+		apiErr = ErrEvaluatorInvalidTimestampFormatPatternSymbol
+	case s3select.ErrInvalidColumnIndex:
+		apiErr = ErrInvalidColumnIndex
+	case s3select.ErrEvaluatorBindingDoesNotExist:
+		apiErr = ErrEvaluatorBindingDoesNotExist
+	case s3select.ErrMissingHeaders:
+		apiErr = ErrMissingHeaders
+
 	}
 
 	if apiErr != ErrNone {
@@ -871,27 +1609,10 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		return apiErr
 	}
 
-	switch err { // SSE errors
-	case errInsecureSSERequest:
-		return ErrInsecureSSECustomerRequest
-	case errInvalidSSEAlgorithm:
-		return ErrInvalidSSECustomerAlgorithm
-	case errInvalidSSEKey:
-		return ErrInvalidSSECustomerKey
-	case errMissingSSEKey:
-		return ErrMissingSSECustomerKey
-	case errMissingSSEKeyMD5:
-		return ErrMissingSSECustomerKeyMD5
-	case errSSEKeyMD5Mismatch:
-		return ErrSSECustomerKeyMD5Mismatch
-	case errObjectTampered:
-		return ErrObjectTampered
-	case errEncryptedObject:
-		return ErrSSEEncryptedObject
-	case errInvalidSSEParameters:
-		return ErrInvalidSSECustomerParameters
-	case errSSEKeyMismatch:
-		return ErrAccessDenied // no access without correct key
+	// etcd specific errors, a key is always a bucket for us return
+	// ErrNoSuchBucket in such a case.
+	if err == dns.ErrNoEntriesFound {
+		return ErrNoSuchBucket
 	}
 
 	switch err.(type) {
@@ -957,8 +1678,6 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		apiErr = ErrEntityTooLarge
 	case UnsupportedMetadata:
 		apiErr = ErrUnsupportedMetadata
-	case PartsSizeUnequal:
-		apiErr = ErrPartsSizeUnequal
 	case BucketPolicyNotFound:
 		apiErr = ErrNoSuchBucketPolicy
 	case *event.ErrInvalidEventName:
@@ -985,6 +1704,8 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		apiErr = ErrUnsupportedNotification
 	case BackendDown:
 		apiErr = ErrBackendDown
+	case crypto.Error:
+		apiErr = ErrObjectTampered
 	default:
 		apiErr = ErrInternalError
 	}
@@ -999,12 +1720,12 @@ func getAPIError(code APIErrorCode) APIError {
 
 // getErrorResponse gets in standard error and resource value and
 // provides a encodable populated response values
-func getAPIErrorResponse(err APIError, resource string) APIErrorResponse {
+func getAPIErrorResponse(err APIError, resource, requestid string) APIErrorResponse {
 	return APIErrorResponse{
 		Code:      err.Code,
 		Message:   err.Description,
 		Resource:  resource,
-		RequestID: "3L137",
+		RequestID: requestid,
 		HostID:    "3L137",
 	}
 }

cmd/api-errors_test.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 	"testing"
 
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/pkg/hash"
 )
 
@@ -52,11 +53,11 @@ var toAPIErrorCodeTests = []struct {
 
 	// SSE-C errors
 	{err: errInsecureSSERequest, errCode: ErrInsecureSSECustomerRequest},
-	{err: errInvalidSSEAlgorithm, errCode: ErrInvalidSSECustomerAlgorithm},
-	{err: errMissingSSEKey, errCode: ErrMissingSSECustomerKey},
-	{err: errInvalidSSEKey, errCode: ErrInvalidSSECustomerKey},
-	{err: errMissingSSEKeyMD5, errCode: ErrMissingSSECustomerKeyMD5},
-	{err: errSSEKeyMD5Mismatch, errCode: ErrSSECustomerKeyMD5Mismatch},
+	{err: crypto.ErrInvalidCustomerAlgorithm, errCode: ErrInvalidSSECustomerAlgorithm},
+	{err: crypto.ErrMissingCustomerKey, errCode: ErrMissingSSECustomerKey},
+	{err: crypto.ErrInvalidCustomerKey, errCode: ErrInvalidSSECustomerKey},
+	{err: crypto.ErrMissingCustomerKeyMD5, errCode: ErrMissingSSECustomerKeyMD5},
+	{err: crypto.ErrCustomerKeyMD5Mismatch, errCode: ErrSSECustomerKeyMD5Mismatch},
 	{err: errObjectTampered, errCode: ErrObjectTampered},
 
 	{err: nil, errCode: ErrNone},

cmd/api-headers.go

@@ -34,8 +34,6 @@ func mustGetRequestID(t time.Time) string {
 
 // Write http common headers
 func setCommonHeaders(w http.ResponseWriter) {
-	// Set unique request ID for each reply.
-	w.Header().Set(responseRequestIDKey, mustGetRequestID(UTCNow()))
 	w.Header().Set("Server", globalServerUserAgent)
 	// Set `x-amz-bucket-region` only if region is set on the server
 	// by default minio uses an empty region.
@@ -102,6 +100,5 @@ func setObjectHeaders(w http.ResponseWriter, objInfo ObjectInfo, contentRange *h
 		// Override content-length
 		w.Header().Set("Content-Length", strconv.FormatInt(contentRange.getLength(), 10))
 		w.Header().Set("Content-Range", contentRange.String())
-		w.WriteHeader(http.StatusPartialContent)
 	}
 }

cmd/api-resources.go

@@ -36,7 +36,17 @@ func getListObjectsV1Args(values url.Values) (prefix, marker, delimiter string,
 }
 
 // Parse bucket url queries for ListObjects V2.
-func getListObjectsV2Args(values url.Values) (prefix, token, startAfter, delimiter string, fetchOwner bool, maxkeys int, encodingType string) {
+func getListObjectsV2Args(values url.Values) (prefix, token, startAfter, delimiter string, fetchOwner bool, maxkeys int, encodingType string, errCode APIErrorCode) {
+	errCode = ErrNone
+
+	// The continuation-token cannot be empty.
+	if val, ok := values["continuation-token"]; ok {
+		if len(val[0]) == 0 {
+			errCode = ErrIncorrectContinuationToken
+			return
+		}
+	}
+
 	prefix = values.Get("prefix")
 	token = values.Get("continuation-token")
 	startAfter = values.Get("start-after")

cmd/api-resources_test.go

@@ -29,6 +29,7 @@ func TestListObjectsV2Resources(t *testing.T) {
 		fetchOwner                           bool
 		maxKeys                              int
 		encodingType                         string
+		errCode                              APIErrorCode
 	}{
 		{
 			values: url.Values{
@@ -47,6 +48,7 @@ func TestListObjectsV2Resources(t *testing.T) {
 			fetchOwner:   true,
 			maxKeys:      100,
 			encodingType: "gzip",
+			errCode:      ErrNone,
 		},
 		{
 			values: url.Values{
@@ -64,11 +66,34 @@ func TestListObjectsV2Resources(t *testing.T) {
 			fetchOwner:   true,
 			maxKeys:      1000,
 			encodingType: "gzip",
+			errCode:      ErrNone,
+		},
+		{
+			values: url.Values{
+				"prefix":             []string{"photos/"},
+				"continuation-token": []string{""},
+				"start-after":        []string{"start-after"},
+				"delimiter":          []string{"/"},
+				"fetch-owner":        []string{"true"},
+				"encoding-type":      []string{"gzip"},
+			},
+			prefix:       "",
+			token:        "",
+			startAfter:   "",
+			delimiter:    "",
+			fetchOwner:   false,
+			maxKeys:      0,
+			encodingType: "",
+			errCode:      ErrIncorrectContinuationToken,
 		},
 	}
 
 	for i, testCase := range testCases {
-		prefix, token, startAfter, delimiter, fetchOwner, maxKeys, encodingType := getListObjectsV2Args(testCase.values)
+		prefix, token, startAfter, delimiter, fetchOwner, maxKeys, encodingType, errCode := getListObjectsV2Args(testCase.values)
+
+		if errCode != testCase.errCode {
+			t.Errorf("Test %d: Expected error code:%d, got %d", i+1, testCase.errCode, errCode)
+		}
 		if prefix != testCase.prefix {
 			t.Errorf("Test %d: Expected %s, got %s", i+1, testCase.prefix, prefix)
 		}

cmd/api-response-multipart.go

@@ -44,7 +44,7 @@ func writePartSmallErrorResponse(w http.ResponseWriter, r *http.Request, err Par
 
 	apiError := getAPIError(toAPIErrorCode(err))
 	// Generate complete multipart error response.
-	errorResponse := getAPIErrorResponse(apiError, r.URL.Path)
+	errorResponse := getAPIErrorResponse(apiError, r.URL.Path, w.Header().Get(responseRequestIDKey))
 	cmpErrResp := completeMultipartAPIError{err.PartSize, int64(5242880), err.PartNumber, err.PartETag, errorResponse}
 	encodedErrorResponse := encodeResponse(cmpErrResp)
 

cmd/api-response.go

@@ -21,6 +21,7 @@ import (
 	"net/http"
 	"net/url"
 	"path"
+	"strings"
 	"time"
 
 	"github.com/minio/minio/pkg/handlers"
@@ -293,8 +294,10 @@ func getObjectLocation(r *http.Request, domain, bucket, object string) string {
 	}
 	// If domain is set then we need to use bucket DNS style.
 	if domain != "" {
-		u.Host = bucket + "." + domain
-		u.Path = path.Join(slashSeparator, object)
+		if strings.Contains(r.Host, domain) {
+			u.Host = bucket + "." + r.Host
+			u.Path = path.Join(slashSeparator, object)
+		}
 	}
 	return u.String()
 }
@@ -574,7 +577,7 @@ func writeErrorResponse(w http.ResponseWriter, errorCode APIErrorCode, reqURL *u
 	}
 	apiError := getAPIError(errorCode)
 	// Generate error response.
-	errorResponse := getAPIErrorResponse(apiError, reqURL.Path)
+	errorResponse := getAPIErrorResponse(apiError, reqURL.Path, w.Header().Get(responseRequestIDKey))
 	encodedErrorResponse := encodeResponse(errorResponse)
 	writeResponse(w, apiError.HTTPStatusCode, encodedErrorResponse, mimeXML)
 }
@@ -589,7 +592,7 @@ func writeErrorResponseHeadersOnly(w http.ResponseWriter, errorCode APIErrorCode
 func writeErrorResponseJSON(w http.ResponseWriter, errorCode APIErrorCode, reqURL *url.URL) {
 	apiError := getAPIError(errorCode)
 	// Generate error response.
-	errorResponse := getAPIErrorResponse(apiError, reqURL.Path)
+	errorResponse := getAPIErrorResponse(apiError, reqURL.Path, w.Header().Get(responseRequestIDKey))
 	encodedErrorResponse := encodeResponseJSON(errorResponse)
 	writeResponse(w, apiError.HTTPStatusCode, encodedErrorResponse, mimeJSON)
 }

cmd/api-router.go

@@ -20,7 +20,6 @@ import (
 	"net/http"
 
 	"github.com/gorilla/mux"
-	"github.com/minio/minio/cmd/logger"
 )
 
 // objectAPIHandler implements and provides http handlers for S3 API.
@@ -31,14 +30,6 @@ type objectAPIHandlers struct {
 
 // registerAPIRouter - registers S3 compatible APIs.
 func registerAPIRouter(router *mux.Router) {
-	var err error
-	var cacheConfig = globalServerConfig.GetCacheConfig()
-	if len(cacheConfig.Drives) > 0 {
-		// initialize the new disk cache objects.
-		globalCacheObjectAPI, err = newServerCacheObjects(cacheConfig)
-		logger.FatalIf(err, "Unable to initialize disk caching")
-	}
-
 	// Initialize API.
 	api := objectAPIHandlers{
 		ObjectAPI: newObjectLayerFn,
@@ -71,6 +62,8 @@ func registerAPIRouter(router *mux.Router) {
 		bucket.Methods("DELETE").Path("/{object:.+}").HandlerFunc(httpTraceAll(api.AbortMultipartUploadHandler)).Queries("uploadId", "{uploadId:.*}")
 		// GetObjectACL - this is a dummy call.
 		bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(httpTraceHdrs(api.GetObjectACLHandler)).Queries("acl", "")
+		// SelectObjectContent
+		bucket.Methods("POST").Path("/{object:.+}").HandlerFunc(httpTraceHdrs(api.SelectObjectContentHandler)).Queries("select", "").Queries("select-type", "2")
 		// GetObject
 		bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(httpTraceHdrs(api.GetObjectHandler))
 		// CopyObject
@@ -108,7 +101,7 @@ func registerAPIRouter(router *mux.Router) {
 		// HeadBucket
 		bucket.Methods("HEAD").HandlerFunc(httpTraceAll(api.HeadBucketHandler))
 		// PostPolicy
-		bucket.Methods("POST").HeadersRegexp("Content-Type", "multipart/form-data*").HandlerFunc(httpTraceAll(api.PostPolicyBucketHandler))
+		bucket.Methods("POST").HeadersRegexp("Content-Type", "multipart/form-data*").HandlerFunc(httpTraceHdrs(api.PostPolicyBucketHandler))
 		// DeleteMultipleObjects
 		bucket.Methods("POST").HandlerFunc(httpTraceAll(api.DeleteMultipleObjectsHandler)).Queries("delete", "")
 		// DeleteBucketPolicy

cmd/auth-handler_test.go

@@ -344,11 +344,14 @@ func mustNewSignedBadMD5Request(method string, urlStr string, contentLength int6
 
 // Tests is requested authenticated function, tests replies for s3 errors.
 func TestIsReqAuthenticated(t *testing.T) {
-	path, err := newTestConfig(globalMinioDefaultRegion)
+	objLayer, fsDir, err := prepareFS()
 	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(fsDir)
+	if err = newTestConfig(globalMinioDefaultRegion, objLayer); err != nil {
 		t.Fatalf("unable initialize config file, %s", err)
 	}
-	defer os.RemoveAll(path)
 
 	creds, err := auth.CreateCredentials("myuser", "mypassword")
 	if err != nil {
@@ -384,11 +387,15 @@ func TestIsReqAuthenticated(t *testing.T) {
 	}
 }
 func TestCheckAdminRequestAuthType(t *testing.T) {
-	path, err := newTestConfig(globalMinioDefaultRegion)
+	objLayer, fsDir, err := prepareFS()
 	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(fsDir)
+
+	if err = newTestConfig(globalMinioDefaultRegion, objLayer); err != nil {
 		t.Fatalf("unable initialize config file, %s", err)
 	}
-	defer os.RemoveAll(path)
 
 	creds, err := auth.CreateCredentials("myuser", "mypassword")
 	if err != nil {

cmd/benchmark-utils_test.go

@@ -22,7 +22,6 @@ import (
 	"io/ioutil"
 	"math"
 	"math/rand"
-	"os"
 	"strconv"
 	"testing"
 
@@ -138,12 +137,6 @@ func runPutObjectPartBenchmark(b *testing.B, obj ObjectLayer, partSize int) {
 
 // creates XL/FS backend setup, obtains the object layer and calls the runPutObjectPartBenchmark function.
 func benchmarkPutObjectPart(b *testing.B, instanceType string, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// create a temp XL/FS backend.
 	objLayer, disks, err := prepareBenchmarkBackend(instanceType)
 	if err != nil {
@@ -151,18 +144,13 @@ func benchmarkPutObjectPart(b *testing.B, instanceType string, objSize int) {
 	}
 	// cleaning up the backend by removing all the directories and files created on function return.
 	defer removeRoots(disks)
+
 	// uses *testing.B and the object Layer to run the benchmark.
 	runPutObjectPartBenchmark(b, objLayer, objSize)
 }
 
 // creates XL/FS backend setup, obtains the object layer and calls the runPutObjectBenchmark function.
 func benchmarkPutObject(b *testing.B, instanceType string, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// create a temp XL/FS backend.
 	objLayer, disks, err := prepareBenchmarkBackend(instanceType)
 	if err != nil {
@@ -170,18 +158,13 @@ func benchmarkPutObject(b *testing.B, instanceType string, objSize int) {
 	}
 	// cleaning up the backend by removing all the directories and files created on function return.
 	defer removeRoots(disks)
+
 	// uses *testing.B and the object Layer to run the benchmark.
 	runPutObjectBenchmark(b, objLayer, objSize)
 }
 
 // creates XL/FS backend setup, obtains the object layer and runs parallel benchmark for put object.
 func benchmarkPutObjectParallel(b *testing.B, instanceType string, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// create a temp XL/FS backend.
 	objLayer, disks, err := prepareBenchmarkBackend(instanceType)
 	if err != nil {
@@ -189,6 +172,7 @@ func benchmarkPutObjectParallel(b *testing.B, instanceType string, objSize int)
 	}
 	// cleaning up the backend by removing all the directories and files created on function return.
 	defer removeRoots(disks)
+
 	// uses *testing.B and the object Layer to run the benchmark.
 	runPutObjectBenchmarkParallel(b, objLayer, objSize)
 }
@@ -196,16 +180,10 @@ func benchmarkPutObjectParallel(b *testing.B, instanceType string, objSize int)
 // Benchmark utility functions for ObjectLayer.GetObject().
 // Creates Object layer setup ( MakeBucket, PutObject) and then runs the benchmark.
 func runGetObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// obtains random bucket name.
 	bucket := getRandomBucketName()
 	// create bucket.
-	err = obj.MakeBucketWithLocation(context.Background(), bucket, "")
+	err := obj.MakeBucketWithLocation(context.Background(), bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -269,12 +247,6 @@ func generateBytesData(size int) []byte {
 
 // creates XL/FS backend setup, obtains the object layer and calls the runGetObjectBenchmark function.
 func benchmarkGetObject(b *testing.B, instanceType string, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// create a temp XL/FS backend.
 	objLayer, disks, err := prepareBenchmarkBackend(instanceType)
 	if err != nil {
@@ -282,18 +254,13 @@ func benchmarkGetObject(b *testing.B, instanceType string, objSize int) {
 	}
 	// cleaning up the backend by removing all the directories and files created.
 	defer removeRoots(disks)
+
 	//  uses *testing.B and the object Layer to run the benchmark.
 	runGetObjectBenchmark(b, objLayer, objSize)
 }
 
 // creates XL/FS backend setup, obtains the object layer and runs parallel benchmark for ObjectLayer.GetObject() .
 func benchmarkGetObjectParallel(b *testing.B, instanceType string, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// create a temp XL/FS backend.
 	objLayer, disks, err := prepareBenchmarkBackend(instanceType)
 	if err != nil {
@@ -301,6 +268,7 @@ func benchmarkGetObjectParallel(b *testing.B, instanceType string, objSize int)
 	}
 	// cleaning up the backend by removing all the directories and files created.
 	defer removeRoots(disks)
+
 	//  uses *testing.B and the object Layer to run the benchmark.
 	runGetObjectBenchmarkParallel(b, objLayer, objSize)
 }
@@ -308,16 +276,10 @@ func benchmarkGetObjectParallel(b *testing.B, instanceType string, objSize int)
 // Parallel benchmark utility functions for ObjectLayer.PutObject().
 // Creates Object layer setup ( MakeBucket ) and then runs the PutObject benchmark.
 func runPutObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// obtains random bucket name.
 	bucket := getRandomBucketName()
 	// create bucket.
-	err = obj.MakeBucketWithLocation(context.Background(), bucket, "")
+	err := obj.MakeBucketWithLocation(context.Background(), bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -359,16 +321,10 @@ func runPutObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
 // Parallel benchmark utility functions for ObjectLayer.GetObject().
 // Creates Object layer setup ( MakeBucket, PutObject) and then runs the benchmark.
 func runGetObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		b.Fatalf("Unable to initialize config. %s", err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	// obtains random bucket name.
 	bucket := getRandomBucketName()
 	// create bucket.
-	err = obj.MakeBucketWithLocation(context.Background(), bucket, "")
+	err := obj.MakeBucketWithLocation(context.Background(), bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}

cmd/bitrot.go

@@ -0,0 +1,192 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"context"
+	"errors"
+	"hash"
+
+	"github.com/minio/highwayhash"
+	"github.com/minio/minio/cmd/logger"
+	"github.com/minio/sha256-simd"
+	"golang.org/x/crypto/blake2b"
+)
+
+// magic HH-256 key as HH-256 hash of the first 100 decimals of π as utf-8 string with a zero key.
+var magicHighwayHash256Key = []byte("\x4b\xe7\x34\xfa\x8e\x23\x8a\xcd\x26\x3e\x83\xe6\xbb\x96\x85\x52\x04\x0f\x93\x5d\xa3\x9f\x44\x14\x97\xe0\x9d\x13\x22\xde\x36\xa0")
+
+// BitrotAlgorithm specifies a algorithm used for bitrot protection.
+type BitrotAlgorithm uint
+
+const (
+	// SHA256 represents the SHA-256 hash function
+	SHA256 BitrotAlgorithm = 1 + iota
+	// HighwayHash256 represents the HighwayHash-256 hash function
+	HighwayHash256
+	// BLAKE2b512 represents the BLAKE2b-512 hash function
+	BLAKE2b512
+)
+
+// DefaultBitrotAlgorithm is the default algorithm used for bitrot protection.
+const (
+	DefaultBitrotAlgorithm = HighwayHash256
+)
+
+var bitrotAlgorithms = map[BitrotAlgorithm]string{
+	SHA256:         "sha256",
+	BLAKE2b512:     "blake2b",
+	HighwayHash256: "highwayhash256",
+}
+
+// New returns a new hash.Hash calculating the given bitrot algorithm.
+func (a BitrotAlgorithm) New() hash.Hash {
+	switch a {
+	case SHA256:
+		return sha256.New()
+	case BLAKE2b512:
+		b2, _ := blake2b.New512(nil) // New512 never returns an error if the key is nil
+		return b2
+	case HighwayHash256:
+		hh, _ := highwayhash.New(magicHighwayHash256Key) // New will never return error since key is 256 bit
+		return hh
+	default:
+		logger.CriticalIf(context.Background(), errors.New("Unsupported bitrot algorithm"))
+		return nil
+	}
+}
+
+// Available reports whether the given algorihm is available.
+func (a BitrotAlgorithm) Available() bool {
+	_, ok := bitrotAlgorithms[a]
+	return ok
+}
+
+// String returns the string identifier for a given bitrot algorithm.
+// If the algorithm is not supported String panics.
+func (a BitrotAlgorithm) String() string {
+	name, ok := bitrotAlgorithms[a]
+	if !ok {
+		logger.CriticalIf(context.Background(), errors.New("Unsupported bitrot algorithm"))
+	}
+	return name
+}
+
+// NewBitrotVerifier returns a new BitrotVerifier implementing the given algorithm.
+func NewBitrotVerifier(algorithm BitrotAlgorithm, checksum []byte) *BitrotVerifier {
+	return &BitrotVerifier{algorithm, checksum}
+}
+
+// BitrotVerifier can be used to verify protected data.
+type BitrotVerifier struct {
+	algorithm BitrotAlgorithm
+	sum       []byte
+}
+
+// BitrotAlgorithmFromString returns a bitrot algorithm from the given string representation.
+// It returns 0 if the string representation does not match any supported algorithm.
+// The zero value of a bitrot algorithm is never supported.
+func BitrotAlgorithmFromString(s string) (a BitrotAlgorithm) {
+	for alg, name := range bitrotAlgorithms {
+		if name == s {
+			return alg
+		}
+	}
+	return
+}
+
+// To read bit-rot verified data.
+type bitrotReader struct {
+	disk      StorageAPI
+	volume    string
+	filePath  string
+	verifier  *BitrotVerifier // Holds the bit-rot info
+	endOffset int64           // Affects the length of data requested in disk.ReadFile depending on Read()'s offset
+	buf       []byte          // Holds bit-rot verified data
+}
+
+// newBitrotReader returns bitrotReader.
+// Note that the buffer is allocated later in Read(). This is because we will know the buffer length only
+// during the bitrotReader.Read(). Depending on when parallelReader fails-over, the buffer length can be different.
+func newBitrotReader(disk StorageAPI, volume, filePath string, algo BitrotAlgorithm, endOffset int64, sum []byte) *bitrotReader {
+	return &bitrotReader{
+		disk:      disk,
+		volume:    volume,
+		filePath:  filePath,
+		verifier:  &BitrotVerifier{algo, sum},
+		endOffset: endOffset,
+		buf:       nil,
+	}
+}
+
+// ReadChunk returns requested data.
+func (b *bitrotReader) ReadChunk(offset int64, length int64) ([]byte, error) {
+	if b.buf == nil {
+		b.buf = make([]byte, b.endOffset-offset)
+		if _, err := b.disk.ReadFile(b.volume, b.filePath, offset, b.buf, b.verifier); err != nil {
+			logger.LogIf(context.Background(), err)
+			return nil, err
+		}
+	}
+	if int64(len(b.buf)) < length {
+		logger.LogIf(context.Background(), errLessData)
+		return nil, errLessData
+	}
+	retBuf := b.buf[:length]
+	b.buf = b.buf[length:]
+	return retBuf, nil
+}
+
+// To calculate the bit-rot of the written data.
+type bitrotWriter struct {
+	disk     StorageAPI
+	volume   string
+	filePath string
+	h        hash.Hash
+}
+
+// newBitrotWriter returns bitrotWriter.
+func newBitrotWriter(disk StorageAPI, volume, filePath string, algo BitrotAlgorithm) *bitrotWriter {
+	return &bitrotWriter{
+		disk:     disk,
+		volume:   volume,
+		filePath: filePath,
+		h:        algo.New(),
+	}
+}
+
+// Append appends the data and while calculating the hash.
+func (b *bitrotWriter) Append(buf []byte) error {
+	n, err := b.h.Write(buf)
+	if err != nil {
+		return err
+	}
+	if n != len(buf) {
+		logger.LogIf(context.Background(), errUnexpected)
+		return errUnexpected
+	}
+	if err = b.disk.AppendFile(b.volume, b.filePath, buf); err != nil {
+		logger.LogIf(context.Background(), err)
+		return err
+	}
+	return nil
+}
+
+// Sum returns bit-rot sum.
+func (b *bitrotWriter) Sum() []byte {
+	return b.h.Sum(nil)
+}

cmd/bitrot_test.go

@@ -0,0 +1,71 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"testing"
+)
+
+func TestBitrotReaderWriter(t *testing.T) {
+	tmpDir, err := ioutil.TempDir("", "")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	volume := "testvol"
+	filePath := "testfile"
+
+	disk, err := newPosix(tmpDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	disk.MakeVol(volume)
+
+	writer := newBitrotWriter(disk, volume, filePath, HighwayHash256)
+
+	err = writer.Append([]byte("aaaaaaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("a"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("aaaaaaaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("aaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = writer.Append([]byte("aaaaaaaaaa"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	reader := newBitrotReader(disk, volume, filePath, HighwayHash256, 35, writer.Sum())
+
+	if _, err = reader.ReadChunk(0, 35); err != nil {
+		log.Fatal(err)
+	}
+}

cmd/bool-flag.go

@@ -56,11 +56,12 @@ func (bf *BoolFlag) UnmarshalJSON(data []byte) (err error) {
 
 // ParseBoolFlag - parses string into BoolFlag.
 func ParseBoolFlag(s string) (bf BoolFlag, err error) {
-	if s == "on" {
+	switch s {
+	case "on":
 		bf = true
-	} else if s == "off" {
+	case "off":
 		bf = false
-	} else {
+	default:
 		err = fmt.Errorf("invalid value ‘%s’ for BoolFlag", s)
 	}
 

cmd/bucket-handlers-listobjects.go

@@ -20,6 +20,8 @@ import (
 	"net/http"
 
 	"github.com/gorilla/mux"
+	"github.com/minio/minio/cmd/crypto"
+
 	"github.com/minio/minio/pkg/policy"
 )
 
@@ -54,7 +56,7 @@ func validateListObjectsArgs(prefix, marker, delimiter string, maxKeys int) APIE
 // NOTE: It is recommended that this API to be used for application development.
 // Minio continues to support ListObjectsV1 for supporting legacy tools.
 func (api objectAPIHandlers) ListObjectsV2Handler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "ListObjectsV2")
+	ctx := newContext(r, w, "ListObjectsV2")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -70,20 +72,19 @@ func (api objectAPIHandlers) ListObjectsV2Handler(w http.ResponseWriter, r *http
 		return
 	}
 
-	// Extract all the listObjectsV2 query params to their native values.
-	prefix, token, startAfter, delimiter, fetchOwner, maxKeys, _ := getListObjectsV2Args(r.URL.Query())
+	urlValues := r.URL.Query()
 
-	// In ListObjectsV2 'continuation-token' is the marker.
-	marker := token
-	// Check if 'continuation-token' is empty.
-	if token == "" {
-		// Then we need to use 'start-after' as marker instead.
-		marker = startAfter
+	// Extract all the listObjectsV2 query params to their native values.
+	prefix, token, startAfter, delimiter, fetchOwner, maxKeys, _, errCode := getListObjectsV2Args(urlValues)
+
+	if errCode != ErrNone {
+		writeErrorResponse(w, errCode, r.URL)
+		return
 	}
 
 	// Validate the query params before beginning to serve the request.
 	// fetch-owner is not validated since it is a boolean
-	if s3Error := validateListObjectsArgs(prefix, marker, delimiter, maxKeys); s3Error != ErrNone {
+	if s3Error := validateListObjectsArgs(prefix, token, delimiter, maxKeys); s3Error != ErrNone {
 		writeErrorResponse(w, s3Error, r.URL)
 		return
 	}
@@ -93,15 +94,15 @@ func (api objectAPIHandlers) ListObjectsV2Handler(w http.ResponseWriter, r *http
 	}
 	// Inititate a list objects operation based on the input params.
 	// On success would return back ListObjectsInfo object to be
-	// marshalled into S3 compatible XML header.
-	listObjectsV2Info, err := listObjectsV2(ctx, bucket, prefix, marker, delimiter, maxKeys, fetchOwner, startAfter)
+	// marshaled into S3 compatible XML header.
+	listObjectsV2Info, err := listObjectsV2(ctx, bucket, prefix, token, delimiter, maxKeys, fetchOwner, startAfter)
 	if err != nil {
 		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
 		return
 	}
 
 	for i := range listObjectsV2Info.Objects {
-		if listObjectsV2Info.Objects[i].IsEncrypted() {
+		if crypto.IsEncrypted(listObjectsV2Info.Objects[i].UserDefined) {
 			listObjectsV2Info.Objects[i].Size, err = listObjectsV2Info.Objects[i].DecryptedSize()
 			if err != nil {
 				writeErrorResponse(w, toAPIErrorCode(err), r.URL)
@@ -124,7 +125,7 @@ func (api objectAPIHandlers) ListObjectsV2Handler(w http.ResponseWriter, r *http
 // criteria to return a subset of the objects in a bucket.
 //
 func (api objectAPIHandlers) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "ListObjectsV1")
+	ctx := newContext(r, w, "ListObjectsV1")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -159,7 +160,7 @@ func (api objectAPIHandlers) ListObjectsV1Handler(w http.ResponseWriter, r *http
 	}
 	// Inititate a list objects operation based on the input params.
 	// On success would return back ListObjectsInfo object to be
-	// marshalled into S3 compatible XML header.
+	// marshaled into S3 compatible XML header.
 	listObjectsInfo, err := listObjects(ctx, bucket, prefix, marker, delimiter, maxKeys)
 	if err != nil {
 		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
@@ -167,7 +168,7 @@ func (api objectAPIHandlers) ListObjectsV1Handler(w http.ResponseWriter, r *http
 	}
 
 	for i := range listObjectsInfo.Objects {
-		if listObjectsInfo.Objects[i].IsEncrypted() {
+		if crypto.IsEncrypted(listObjectsInfo.Objects[i].UserDefined) {
 			listObjectsInfo.Objects[i].Size, err = listObjectsInfo.Objects[i].DecryptedSize()
 			if err != nil {
 				writeErrorResponse(w, toAPIErrorCode(err), r.URL)

cmd/bucket-handlers.go

@@ -17,8 +17,10 @@
 package cmd
 
 import (
+	"context"
 	"encoding/base64"
 	"encoding/xml"
+	"fmt"
 	"io"
 	"net"
 	"net/http"
@@ -26,20 +28,66 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
-	"sync"
 
 	"github.com/gorilla/mux"
+
+	"github.com/minio/minio-go/pkg/set"
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/cmd/logger"
+	"github.com/minio/minio/pkg/dns"
 	"github.com/minio/minio/pkg/event"
+	"github.com/minio/minio/pkg/handlers"
 	"github.com/minio/minio/pkg/hash"
 	"github.com/minio/minio/pkg/policy"
+	"github.com/minio/minio/pkg/sync/errgroup"
 )
 
+// Check if there are buckets on server without corresponding entry in etcd backend and
+// make entries. Here is the general flow
+// - Range over all the available buckets
+// - Check if a bucket has an entry in etcd backend
+// -- If no, make an entry
+// -- If yes, check if the IP of entry matches local IP. This means entry is for this instance.
+// -- If IP of the entry doesn't match, this means entry is for another instance. Log an error to console.
+func initFederatorBackend(objLayer ObjectLayer) {
+	b, err := objLayer.ListBuckets(context.Background())
+	if err != nil {
+		logger.LogIf(context.Background(), err)
+		return
+	}
+
+	g := errgroup.WithNErrs(len(b))
+	for index := range b {
+		index := index
+		g.Go(func() error {
+			r, gerr := globalDNSConfig.Get(b[index].Name)
+			if gerr != nil {
+				if gerr == dns.ErrNoEntriesFound {
+					return globalDNSConfig.Put(b[index].Name)
+				}
+				return gerr
+			}
+			if globalDomainIPs.Intersection(set.CreateStringSet(getHostsSlice(r)...)).IsEmpty() {
+				// There is already an entry for this bucket, with all IP addresses different. This indicates a bucket name collision. Log an error and continue.
+				return fmt.Errorf("Unable to add bucket DNS entry for bucket %s, an entry exists for the same bucket. Use one of these IP addresses %v to access the bucket", b[index].Name, globalDomainIPs.ToSlice())
+			}
+			return nil
+		}, index)
+	}
+
+	for _, err := range g.Wait() {
+		if err != nil {
+			logger.LogIf(context.Background(), err)
+			return
+		}
+	}
+}
+
 // GetBucketLocationHandler - GET Bucket location.
 // -------------------------
 // This operation returns bucket location.
 func (api objectAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "GetBucketLocation")
+	ctx := newContext(r, w, "GetBucketLocation")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -55,12 +103,6 @@ func (api objectAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *
 		return
 	}
 
-	bucketLock := globalNSMutex.NewNSLock(bucket, "")
-	if err := bucketLock.GetRLock(globalObjectTimeout); err != nil {
-		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
-		return
-	}
-	defer bucketLock.RUnlock()
 	getBucketInfo := objectAPI.GetBucketInfo
 	if api.CacheAPI() != nil {
 		getBucketInfo = api.CacheAPI().GetBucketInfo
@@ -93,7 +135,7 @@ func (api objectAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *
 // uploads in the response.
 //
 func (api objectAPIHandlers) ListMultipartUploadsHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "ListMultipartUploads")
+	ctx := newContext(r, w, "ListMultipartUploads")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -140,7 +182,7 @@ func (api objectAPIHandlers) ListMultipartUploadsHandler(w http.ResponseWriter,
 // This implementation of the GET operation returns a list of all buckets
 // owned by the authenticated sender of the request.
 func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "ListBuckets")
+	ctx := newContext(r, w, "ListBuckets")
 
 	objectAPI := api.ObjectAPI()
 	if objectAPI == nil {
@@ -157,12 +199,33 @@ func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.R
 		writeErrorResponse(w, s3Error, r.URL)
 		return
 	}
-
-	// Invoke the list buckets.
-	bucketsInfo, err := listBuckets(ctx)
-	if err != nil {
-		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
-		return
+	// If etcd, dns federation configured list buckets from etcd.
+	var bucketsInfo []BucketInfo
+	if globalDNSConfig != nil {
+		dnsBuckets, err := globalDNSConfig.List()
+		if err != nil && err != dns.ErrNoEntriesFound {
+			writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+			return
+		}
+		bucketSet := set.NewStringSet()
+		for _, dnsRecord := range dnsBuckets {
+			if bucketSet.Contains(dnsRecord.Key) {
+				continue
+			}
+			bucketsInfo = append(bucketsInfo, BucketInfo{
+				Name:    strings.Trim(dnsRecord.Key, slashSeparator),
+				Created: dnsRecord.CreationDate,
+			})
+			bucketSet.Add(dnsRecord.Key)
+		}
+	} else {
+		// Invoke the list buckets.
+		var err error
+		bucketsInfo, err = listBuckets(ctx)
+		if err != nil {
+			writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+			return
+		}
 	}
 
 	// Generate response.
@@ -175,7 +238,7 @@ func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.R
 
 // DeleteMultipleObjectsHandler - deletes multiple objects.
 func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "DeleteMultipleObjects")
+	ctx := newContext(r, w, "DeleteMultipleObjects")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -211,7 +274,13 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 	}
 
 	// Allocate incoming content length bytes.
-	deleteXMLBytes := make([]byte, r.ContentLength)
+	var deleteXMLBytes []byte
+	const maxBodySize = 2 * 1000 * 1024 // The max. XML contains 1000 object names (each at most 1024 bytes long) + XML overhead
+	if r.ContentLength > maxBodySize {  // Only allocated memory for at most 1000 objects
+		deleteXMLBytes = make([]byte, maxBodySize)
+	} else {
+		deleteXMLBytes = make([]byte, r.ContentLength)
+	}
 
 	// Read incoming body XML bytes.
 	if _, err := io.ReadFull(r.Body, deleteXMLBytes); err != nil {
@@ -236,34 +305,24 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 		return
 	}
 
-	var wg = &sync.WaitGroup{} // Allocate a new wait group.
-	var dErrs = make([]error, len(deleteObjects.Objects))
-
-	// Delete all requested objects in parallel.
-	for index, object := range deleteObjects.Objects {
-		wg.Add(1)
-		go func(i int, obj ObjectIdentifier) {
-			defer wg.Done()
-			// If the request is denied access, each item
-			// should be marked as 'AccessDenied'
-			if s3Error == ErrAccessDenied {
-				dErrs[i] = PrefixAccessDenied{
-					Bucket: bucket,
-					Object: obj.ObjectName,
-				}
-				return
-			}
-			deleteObject := objectAPI.DeleteObject
-			if api.CacheAPI() != nil {
-				deleteObject = api.CacheAPI().DeleteObject
-			}
-			dErr := deleteObject(ctx, bucket, obj.ObjectName)
-			if dErr != nil {
-				dErrs[i] = dErr
-			}
-		}(index, object)
+	deleteObject := objectAPI.DeleteObject
+	if api.CacheAPI() != nil {
+		deleteObject = api.CacheAPI().DeleteObject
+	}
+
+	var dErrs = make([]error, len(deleteObjects.Objects))
+	for index, object := range deleteObjects.Objects {
+		// If the request is denied access, each item
+		// should be marked as 'AccessDenied'
+		if s3Error == ErrAccessDenied {
+			dErrs[index] = PrefixAccessDenied{
+				Bucket: bucket,
+				Object: object.ObjectName,
+			}
+			continue
+		}
+		dErrs[index] = deleteObject(ctx, bucket, object.ObjectName)
 	}
-	wg.Wait()
 
 	// Collect deleted objects and errors if any.
 	var deletedObjects []ObjectIdentifier
@@ -298,7 +357,7 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 
 	// Get host and port from Request.RemoteAddr failing which
 	// fill them with empty strings.
-	host, port, err := net.SplitHostPort(r.RemoteAddr)
+	host, port, err := net.SplitHostPort(handlers.GetSourceIP(r))
 	if err != nil {
 		host, port = "", ""
 	}
@@ -323,7 +382,7 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 // ----------
 // This implementation of the PUT operation creates a new bucket for authenticated request
 func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "PutBucket")
+	ctx := newContext(r, w, "PutBucket")
 
 	objectAPI := api.ObjectAPI()
 	if objectAPI == nil {
@@ -353,12 +412,33 @@ func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Req
 		return
 	}
 
-	bucketLock := globalNSMutex.NewNSLock(bucket, "")
-	if err := bucketLock.GetLock(globalObjectTimeout); err != nil {
-		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+	if globalDNSConfig != nil {
+		if _, err := globalDNSConfig.Get(bucket); err != nil {
+			if err == dns.ErrNoEntriesFound {
+				// Proceed to creating a bucket.
+				if err = objectAPI.MakeBucketWithLocation(ctx, bucket, location); err != nil {
+					writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+					return
+				}
+				if err = globalDNSConfig.Put(bucket); err != nil {
+					objectAPI.DeleteBucket(ctx, bucket)
+					writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+					return
+				}
+
+				// Make sure to add Location information here only for bucket
+				w.Header().Set("Location", getObjectLocation(r, globalDomainName, bucket, ""))
+
+				writeSuccessResponseHeadersOnly(w)
+				return
+			}
+			writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+			return
+
+		}
+		writeErrorResponse(w, ErrBucketAlreadyOwnedByYou, r.URL)
 		return
 	}
-	defer bucketLock.Unlock()
 
 	// Proceed to creating a bucket.
 	err := objectAPI.MakeBucketWithLocation(ctx, bucket, location)
@@ -378,7 +458,7 @@ func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Req
 // This implementation of the POST operation handles object creation with a specified
 // signature policy in multipart/form-data
 func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "PostPolicyBucket")
+	ctx := newContext(r, w, "PostPolicyBucket")
 
 	objectAPI := api.ObjectAPI()
 	if objectAPI == nil {
@@ -503,7 +583,8 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	}
 
 	// Extract metadata to be saved from received Form.
-	metadata, err := extractMetadataFromHeader(ctx, formValues)
+	metadata := make(map[string]string)
+	err = extractMetadataFromMap(ctx, formValues, metadata)
 	if err != nil {
 		writeErrorResponse(w, ErrInternalError, r.URL)
 		return
@@ -517,15 +598,17 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	}
 
 	if objectAPI.IsEncryptionSupported() {
-		if hasSSECustomerHeader(formValues) && !hasSuffix(object, slashSeparator) { // handle SSE-C requests
+		if hasServerSideEncryptionHeader(formValues) && !hasSuffix(object, slashSeparator) { // handle SSE-C and SSE-S3 requests
 			var reader io.Reader
 			var key []byte
-			key, err = ParseSSECustomerHeader(formValues)
-			if err != nil {
-				writeErrorResponse(w, toAPIErrorCode(err), r.URL)
-				return
+			if crypto.SSEC.IsRequested(formValues) {
+				key, err = ParseSSECustomerHeader(formValues)
+				if err != nil {
+					writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+					return
+				}
 			}
-			reader, err = newEncryptReader(hashReader, key, metadata)
+			reader, err = newEncryptReader(hashReader, key, bucket, object, metadata, crypto.S3.IsRequested(formValues))
 			if err != nil {
 				writeErrorResponse(w, toAPIErrorCode(err), r.URL)
 				return
@@ -550,7 +633,7 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	w.Header().Set("Location", location)
 
 	// Get host and port from Request.RemoteAddr.
-	host, port, err := net.SplitHostPort(r.RemoteAddr)
+	host, port, err := net.SplitHostPort(handlers.GetSourceIP(r))
 	if err != nil {
 		host, port = "", ""
 	}
@@ -597,7 +680,7 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 // have permission to access it. Otherwise, the operation might
 // return responses such as 404 Not Found and 403 Forbidden.
 func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "HeadBucket")
+	ctx := newContext(r, w, "HeadBucket")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -627,7 +710,7 @@ func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Re
 
 // DeleteBucketHandler - Delete bucket
 func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "DeleteBucket")
+	ctx := newContext(r, w, "DeleteBucket")
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
@@ -655,9 +738,15 @@ func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.
 
 	globalNotificationSys.RemoveNotification(bucket)
 	globalPolicySys.Remove(bucket)
-	for nerr := range globalNotificationSys.DeleteBucket(bucket) {
-		logger.GetReqInfo(ctx).AppendTags("remotePeer", nerr.Host.Name)
-		logger.LogIf(ctx, nerr.Err)
+	globalNotificationSys.DeleteBucket(ctx, bucket)
+
+	if globalDNSConfig != nil {
+		if err := globalDNSConfig.Delete(bucket); err != nil {
+			// Deleting DNS entry failed, attempt to create the bucket again.
+			objectAPI.MakeBucketWithLocation(ctx, bucket, "")
+			writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+			return
+		}
 	}
 
 	// Write success response.

cmd/bucket-notification-handlers.go

@@ -42,7 +42,7 @@ var errNoSuchNotifications = errors.New("The specified bucket does not have buck
 // as per http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html.
 // It returns empty configuration if its not set.
 func (api objectAPIHandlers) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "GetBucketNotification")
+	ctx := newContext(r, w, "GetBucketNotification")
 
 	vars := mux.Vars(r)
 	bucketName := vars["bucket"]
@@ -94,7 +94,7 @@ func (api objectAPIHandlers) GetBucketNotificationHandler(w http.ResponseWriter,
 // PutBucketNotificationHandler - This HTTP handler stores given notification configuration as per
 // http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html.
 func (api objectAPIHandlers) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "PutBucketNotification")
+	ctx := newContext(r, w, "PutBucketNotification")
 
 	objectAPI := api.ObjectAPI()
 	if objectAPI == nil {
@@ -146,10 +146,7 @@ func (api objectAPIHandlers) PutBucketNotificationHandler(w http.ResponseWriter,
 
 	rulesMap := config.ToRulesMap()
 	globalNotificationSys.AddRulesMap(bucketName, rulesMap)
-	for nerr := range globalNotificationSys.PutBucketNotification(bucketName, rulesMap) {
-		logger.GetReqInfo(ctx).AppendTags("remotePeer", nerr.Host.Name)
-		logger.LogIf(ctx, nerr.Err)
-	}
+	globalNotificationSys.PutBucketNotification(ctx, bucketName, rulesMap)
 
 	writeSuccessResponseHeadersOnly(w)
 }
@@ -157,7 +154,7 @@ func (api objectAPIHandlers) PutBucketNotificationHandler(w http.ResponseWriter,
 // ListenBucketNotificationHandler - This HTTP handler sends events to the connected HTTP client.
 // Client should send prefix/suffix object name to match and events to watch as query parameters.
 func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "ListenBucketNotification")
+	ctx := newContext(r, w, "ListenBucketNotification")
 
 	// Validate if bucket exists.
 	objAPI := api.ObjectAPI()
@@ -224,15 +221,21 @@ func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWrit
 		return
 	}
 
-	host, e := xnet.ParseHost(r.RemoteAddr)
-	logger.CriticalIf(ctx, e)
+	host, err := xnet.ParseHost(r.RemoteAddr)
+	if err != nil {
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
 
-	target, e := target.NewHTTPClientTarget(*host, w)
-	logger.CriticalIf(ctx, e)
+	target, err := target.NewHTTPClientTarget(*host, w)
+	if err != nil {
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
 
 	rulesMap := event.NewRulesMap(eventNames, pattern, target.ID())
 
-	if err := globalNotificationSys.AddRemoteTarget(bucketName, target, rulesMap); err != nil {
+	if err = globalNotificationSys.AddRemoteTarget(bucketName, target, rulesMap); err != nil {
 		logger.GetReqInfo(ctx).AppendTags("target", target.ID().Name)
 		logger.LogIf(ctx, err)
 		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
@@ -241,25 +244,24 @@ func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWrit
 	defer globalNotificationSys.RemoveRemoteTarget(bucketName, target.ID())
 	defer globalNotificationSys.RemoveRulesMap(bucketName, rulesMap)
 
-	thisAddr, e := xnet.ParseHost(GetLocalPeer(globalEndpoints))
-	logger.CriticalIf(ctx, e)
+	thisAddr, err := xnet.ParseHost(GetLocalPeer(globalEndpoints))
+	if err != nil {
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
 
-	if err := SaveListener(objAPI, bucketName, eventNames, pattern, target.ID(), *thisAddr); err != nil {
+	if err = SaveListener(objAPI, bucketName, eventNames, pattern, target.ID(), *thisAddr); err != nil {
 		logger.GetReqInfo(ctx).AppendTags("target", target.ID().Name)
 		logger.LogIf(ctx, err)
 		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
 		return
 	}
 
-	errCh := globalNotificationSys.ListenBucketNotification(bucketName, eventNames, pattern, target.ID(), *thisAddr)
-	for nerr := range errCh {
-		logger.GetReqInfo(ctx).AppendTags("remotePeer", nerr.Host.Name)
-		logger.LogIf(ctx, nerr.Err)
-	}
+	globalNotificationSys.ListenBucketNotification(ctx, bucketName, eventNames, pattern, target.ID(), *thisAddr)
 
 	<-target.DoneCh
 
-	if err := RemoveListener(objAPI, bucketName, target.ID(), *thisAddr); err != nil {
+	if err = RemoveListener(objAPI, bucketName, target.ID(), *thisAddr); err != nil {
 		logger.GetReqInfo(ctx).AppendTags("target", target.ID().Name)
 		logger.LogIf(ctx, err)
 		writeErrorResponse(w, toAPIErrorCode(err), r.URL)

cmd/bucket-policy-handlers.go

@@ -38,7 +38,7 @@ const (
 // PutBucketPolicyHandler - This HTTP handler stores given bucket policy configuration as per
 // https://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
 func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "PutBucketPolicy")
+	ctx := newContext(r, w, "PutBucketPolicy")
 
 	objAPI := api.ObjectAPI()
 	if objAPI == nil {
@@ -91,10 +91,7 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 	}
 
 	globalPolicySys.Set(bucket, *bucketPolicy)
-	for nerr := range globalNotificationSys.SetBucketPolicy(bucket, bucketPolicy) {
-		logger.GetReqInfo(ctx).AppendTags("remotePeer", nerr.Host.Name)
-		logger.LogIf(ctx, nerr.Err)
-	}
+	globalNotificationSys.SetBucketPolicy(ctx, bucket, bucketPolicy)
 
 	// Success.
 	writeSuccessNoContent(w)
@@ -102,7 +99,7 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 
 // DeleteBucketPolicyHandler - This HTTP handler removes bucket policy configuration.
 func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "DeleteBucketPolicy")
+	ctx := newContext(r, w, "DeleteBucketPolicy")
 
 	objAPI := api.ObjectAPI()
 	if objAPI == nil {
@@ -130,10 +127,7 @@ func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r
 	}
 
 	globalPolicySys.Remove(bucket)
-	for nerr := range globalNotificationSys.RemoveBucketPolicy(bucket) {
-		logger.GetReqInfo(ctx).AppendTags("remotePeer", nerr.Host.Name)
-		logger.LogIf(ctx, nerr.Err)
-	}
+	globalNotificationSys.RemoveBucketPolicy(ctx, bucket)
 
 	// Success.
 	writeSuccessNoContent(w)
@@ -141,7 +135,7 @@ func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r
 
 // GetBucketPolicyHandler - This HTTP handler returns bucket policy configuration.
 func (api objectAPIHandlers) GetBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
-	ctx := newContext(r, "GetBucketPolicy")
+	ctx := newContext(r, w, "GetBucketPolicy")
 
 	objAPI := api.ObjectAPI()
 	if objAPI == nil {

cmd/bucket-policy-handlers_test.go

@@ -437,11 +437,13 @@ func testGetBucketPolicyHandler(obj ObjectLayer, instanceType, bucketName string
 
 		if recV4.Code != testCase.expectedRespStatus {
 			// Verify whether the bucket policy fetched is same as the one inserted.
-			expectedPolicy, err := policy.ParseConfig(strings.NewReader(expectedBucketPolicyStr), testCase.bucketName)
+			var expectedPolicy *policy.Policy
+			expectedPolicy, err = policy.ParseConfig(strings.NewReader(expectedBucketPolicyStr), testCase.bucketName)
 			if err != nil {
 				t.Fatalf("unexpected error. %v", err)
 			}
-			gotPolicy, err := policy.ParseConfig(bytes.NewReader(bucketPolicyReadBuf), testCase.bucketName)
+			var gotPolicy *policy.Policy
+			gotPolicy, err = policy.ParseConfig(bytes.NewReader(bucketPolicyReadBuf), testCase.bucketName)
 			if err != nil {
 				t.Fatalf("unexpected error. %v", err)
 			}

cmd/build-constants.go

@@ -22,6 +22,9 @@ var (
 	// GOPATH - GOPATH value at the time of build.
 	GOPATH = ""
 
+	// GOROOT - GOROOT value at the time of build.
+	GOROOT = ""
+
 	// Go get development tag.
 	goGetTag = "DEVELOPMENT.GOGET"
 

cmd/certs.go

@@ -86,10 +86,11 @@ func getRootCAs(certsCAsDir string) (*x509.CertPool, error) {
 		return nil, nil
 	}
 
-	rootCAs, err := x509.SystemCertPool()
-	if err != nil {
-		// In some systems like Windows, system cert pool is not supported.
-		// Hence we create a new cert pool.
+	rootCAs, _ := x509.SystemCertPool()
+	if rootCAs == nil {
+		// In some systems (like Windows) system cert pool is
+		// not supported or no certificates are present on the
+		// system - so we create a new cert pool.
 		rootCAs = x509.NewCertPool()
 	}
 

cmd/common-main.go

@@ -18,15 +18,21 @@ package cmd
 
 import (
 	"errors"
+	"net"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
 
+	etcd "github.com/coreos/etcd/clientv3"
 	"github.com/minio/cli"
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/auth"
+	"github.com/minio/minio/pkg/dns"
+
+	"github.com/minio/minio-go/pkg/set"
 )
 
 // Check for updates and print a notification message
@@ -41,14 +47,17 @@ func checkUpdate(mode string) {
 	}
 }
 
-func initConfig() {
-	// Config file does not exist, we create it fresh and return upon success.
-	if isFile(getConfigFile()) {
-		logger.FatalIf(migrateConfig(), "Config migration failed")
-		logger.FatalIf(loadConfig(), "Unable to load the configuration file")
-	} else {
-		logger.FatalIf(newConfig(), "Unable to initialize minio config for the first time")
-		logger.Info("Created minio configuration file successfully at " + getConfigDir())
+// Load logger targets based on user's configuration
+func loadLoggers() {
+	if globalServerConfig.Logger.Console.Enabled {
+		// Enable console logging
+		logger.AddTarget(logger.NewConsole())
+	}
+	for _, l := range globalServerConfig.Logger.HTTP {
+		if l.Enabled {
+			// Enable http logging
+			logger.AddTarget(logger.NewHTTP(l.Endpoint, NewCustomHTTPTransport()))
+		}
 	}
 }
 
@@ -56,9 +65,10 @@ func handleCommonCmdArgs(ctx *cli.Context) {
 
 	var configDir string
 
-	if ctx.IsSet("config-dir") {
+	switch {
+	case ctx.IsSet("config-dir"):
 		configDir = ctx.String("config-dir")
-	} else if ctx.GlobalIsSet("config-dir") {
+	case ctx.GlobalIsSet("config-dir"):
 		configDir = ctx.GlobalString("config-dir")
 		// cli package does not expose parent's "config-dir" option.  Below code is workaround.
 		if configDir == "" || configDir == getConfigDir() {
@@ -66,7 +76,7 @@ func handleCommonCmdArgs(ctx *cli.Context) {
 				configDir = ctx.Parent().GlobalString("config-dir")
 			}
 		}
-	} else {
+	default:
 		// Neither local nor global config-dir option is provided.  In this case, try to use
 		// default config directory.
 		configDir = getConfigDir()
@@ -104,6 +114,11 @@ func handleCommonEnvVars() {
 		globalActiveCred = cred
 	}
 
+	// In distributed setup users need to set ENVs always.
+	if !globalIsEnvCreds && globalIsDistXL {
+		logger.Fatal(uiErrEnvCredentialsMissingServer(nil), "Unable to start distributed server mode")
+	}
+
 	if browser := os.Getenv("MINIO_BROWSER"); browser != "" {
 		browserFlag, err := ParseBoolFlag(browser)
 		if err != nil {
@@ -123,8 +138,37 @@ func handleCommonEnvVars() {
 		logger.FatalIf(err, "error opening file %s", traceFile)
 	}
 
+	etcdEndpointsEnv, ok := os.LookupEnv("MINIO_ETCD_ENDPOINTS")
+	if ok {
+		etcdEndpoints := strings.Split(etcdEndpointsEnv, ",")
+		var err error
+		globalEtcdClient, err = etcd.New(etcd.Config{
+			Endpoints:         etcdEndpoints,
+			DialTimeout:       defaultDialTimeout,
+			DialKeepAliveTime: defaultDialKeepAlive,
+		})
+		logger.FatalIf(err, "Unable to initialize etcd with %s", etcdEndpoints)
+	}
+
 	globalDomainName, globalIsEnvDomainName = os.LookupEnv("MINIO_DOMAIN")
 
+	minioEndpointsEnv, ok := os.LookupEnv("MINIO_PUBLIC_IPS")
+	if ok {
+		minioEndpoints := strings.Split(minioEndpointsEnv, ",")
+		globalDomainIPs = set.NewStringSet()
+		for i, ip := range minioEndpoints {
+			if net.ParseIP(ip) == nil {
+				logger.FatalIf(errInvalidArgument, "Unable to initialize Minio server with invalid MINIO_PUBLIC_IPS[%d]: %s", i, ip)
+			}
+			globalDomainIPs.Add(ip)
+		}
+	}
+	if globalDomainName != "" && !globalDomainIPs.IsEmpty() && globalEtcdClient != nil {
+		var err error
+		globalDNSConfig, err = dns.NewCoreDNS(globalDomainName, globalDomainIPs, globalMinioPort, globalEtcdClient)
+		logger.FatalIf(err, "Unable to initialize DNS config for %s.", globalDomainName)
+	}
+
 	if drives := os.Getenv("MINIO_CACHE_DRIVES"); drives != "" {
 		driveList, err := parseCacheDrives(strings.Split(drives, cacheEnvDelimiter))
 		if err != nil {
@@ -150,6 +194,16 @@ func handleCommonEnvVars() {
 		globalCacheExpiry = expiry
 	}
 
+	if maxUseStr := os.Getenv("MINIO_CACHE_MAXUSE"); maxUseStr != "" {
+		maxUse, err := strconv.Atoi(maxUseStr)
+		if err != nil {
+			logger.Fatal(uiErrInvalidCacheMaxUse(err), "Unable to parse MINIO_CACHE_MAXUSE value (`%s`)", maxUseStr)
+		}
+		// maxUse should be a valid percentage.
+		if maxUse > 0 && maxUse <= 100 {
+			globalCacheMaxUse = maxUse
+		}
+	}
 	// In place update is true by default if the MINIO_UPDATE is not set
 	// or is not set to 'off', if MINIO_UPDATE is set to 'off' then
 	// in-place update is off.
@@ -197,4 +251,18 @@ func handleCommonEnvVars() {
 		globalIsEnvWORM = true
 		globalWORMEnabled = bool(wormFlag)
 	}
+
+	kmsConf, err := crypto.NewVaultConfig()
+	if err != nil {
+		logger.Fatal(err, "Unable to initialize hashicorp vault")
+	}
+	if kmsConf.Vault.Endpoint != "" {
+		kms, err := crypto.NewVault(kmsConf)
+		if err != nil {
+			logger.Fatal(err, "Unable to initialize KMS")
+		}
+		globalKMS = kms
+		globalKMSKeyID = kmsConf.Vault.Key.Name
+		globalKMSConfig = kmsConf
+	}
 }

cmd/config-current.go

@@ -17,17 +17,19 @@
 package cmd
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"reflect"
 	"sync"
 
+	"github.com/miekg/dns"
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/cmd/logger"
 
 	"github.com/minio/minio/pkg/auth"
 	"github.com/minio/minio/pkg/event"
 	"github.com/minio/minio/pkg/event/target"
-	"github.com/minio/minio/pkg/quick"
 )
 
 // Steps to move from version N to version N+1
@@ -39,9 +41,9 @@ import (
 // 6. Make changes in config-current_test.go for any test change
 
 // Config version
-const serverConfigVersion = "25"
+const serverConfigVersion = "28"
 
-type serverConfig = serverConfigV25
+type serverConfig = serverConfigV28
 
 var (
 	// globalServerConfig server config.
@@ -67,6 +69,10 @@ func (s *serverConfig) GetRegion() string {
 
 // SetCredential sets new credential and returns the previous credential.
 func (s *serverConfig) SetCredential(creds auth.Credentials) (prevCred auth.Credentials) {
+	if creds.IsValid() && globalActiveCred.IsValid() {
+		globalActiveCred = creds
+	}
+
 	// Save previous credential.
 	prevCred = s.Credential
 
@@ -79,6 +85,9 @@ func (s *serverConfig) SetCredential(creds auth.Credentials) (prevCred auth.Cred
 
 // GetCredentials get current credentials.
 func (s *serverConfig) GetCredential() auth.Credentials {
+	if globalActiveCred.IsValid() {
+		return globalActiveCred
+	}
 	return s.Credential
 }
 
@@ -116,10 +125,11 @@ func (s *serverConfig) GetWorm() bool {
 }
 
 // SetCacheConfig sets the current cache config
-func (s *serverConfig) SetCacheConfig(drives, exclude []string, expiry int) {
+func (s *serverConfig) SetCacheConfig(drives, exclude []string, expiry int, maxuse int) {
 	s.Cache.Drives = drives
 	s.Cache.Exclude = exclude
 	s.Cache.Expiry = expiry
+	s.Cache.MaxUse = maxuse
 }
 
 // GetCacheConfig gets the current cache config
@@ -127,10 +137,117 @@ func (s *serverConfig) GetCacheConfig() CacheConfig {
 	return s.Cache
 }
 
-// Save config.
-func (s *serverConfig) Save() error {
-	// Save config file.
-	return quick.Save(getConfigFile(), s)
+func (s *serverConfig) Validate() error {
+	if s.Version != serverConfigVersion {
+		return fmt.Errorf("configuration version mismatch. Expected: ‘%s’, Got: ‘%s’", serverConfigVersion, s.Version)
+	}
+
+	// Validate credential fields only when
+	// they are not set via the environment
+	// Error out if global is env credential is not set and config has invalid credential
+	if !globalIsEnvCreds && !s.Credential.IsValid() {
+		return errors.New("invalid credential in config file")
+	}
+
+	// Region: nothing to validate
+	// Browser, Worm, Cache and StorageClass values are already validated during json unmarshal
+
+	if s.Domain != "" {
+		if _, ok := dns.IsDomainName(s.Domain); !ok {
+			return errors.New("invalid domain name")
+		}
+	}
+
+	for _, v := range s.Notify.AMQP {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("amqp: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.Elasticsearch {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("elasticsearch: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.Kafka {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("kafka: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.MQTT {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("mqtt: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.MySQL {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("mysql: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.NATS {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("nats: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.PostgreSQL {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("postgreSQL: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.Redis {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("redis: %s", err.Error())
+		}
+	}
+
+	for _, v := range s.Notify.Webhook {
+		if err := v.Validate(); err != nil {
+			return fmt.Errorf("webhook: %s", err.Error())
+		}
+	}
+
+	return nil
+}
+
+func (s *serverConfig) loadFromEnvs() {
+	// If env is set override the credentials from config file.
+	if globalIsEnvCreds {
+		s.SetCredential(globalActiveCred)
+	}
+
+	if globalIsEnvBrowser {
+		s.SetBrowser(globalIsBrowserEnabled)
+	}
+
+	if globalIsEnvWORM {
+		s.SetWorm(globalWORMEnabled)
+	}
+
+	if globalIsEnvRegion {
+		s.SetRegion(globalServerRegion)
+	}
+
+	if globalIsEnvDomainName {
+		s.Domain = globalDomainName
+	}
+
+	if globalIsStorageClass {
+		s.SetStorageClass(globalStandardStorageClass, globalRRStorageClass)
+	}
+
+	if globalIsDiskCacheEnabled {
+		s.SetCacheConfig(globalCacheDrives, globalCacheExcludes, globalCacheExpiry, globalCacheMaxUse)
+	}
+
+	if globalKMS != nil {
+		s.KMS = globalKMSConfig
+	}
 }
 
 // Returns the string describing a difference with the given
@@ -170,6 +287,10 @@ func (s *serverConfig) ConfigDiff(t *serverConfig) string {
 		return "MySQL Notification configuration differs"
 	case !reflect.DeepEqual(s.Notify.MQTT, t.Notify.MQTT):
 		return "MQTT Notification configuration differs"
+	case !reflect.DeepEqual(s.Logger, t.Logger):
+		return "Logger configuration differs"
+	case !reflect.DeepEqual(s.KMS, t.KMS):
+		return "KMS configuration differs"
 	case reflect.DeepEqual(s, t):
 		return ""
 	default:
@@ -196,7 +317,9 @@ func newServerConfig() *serverConfig {
 			Drives:  []string{},
 			Exclude: []string{},
 			Expiry:  globalCacheExpiry,
+			MaxUse:  globalCacheMaxUse,
 		},
+		KMS:    crypto.KMSConfig{},
 		Notify: notifier{},
 	}
 
@@ -223,140 +346,100 @@ func newServerConfig() *serverConfig {
 	srvCfg.Cache.Drives = make([]string, 0)
 	srvCfg.Cache.Exclude = make([]string, 0)
 	srvCfg.Cache.Expiry = globalCacheExpiry
+	srvCfg.Cache.MaxUse = globalCacheMaxUse
+
+	// Console logging is on by default
+	srvCfg.Logger.Console.Enabled = true
+	// Create an example of HTTP logger
+	srvCfg.Logger.HTTP = make(map[string]loggerHTTP)
+	srvCfg.Logger.HTTP["target1"] = loggerHTTP{Endpoint: "https://username:password@example.com/api"}
+
 	return srvCfg
 }
 
+func (s *serverConfig) loadToCachedConfigs() {
+	if !globalIsEnvCreds {
+		globalActiveCred = s.GetCredential()
+	}
+	if !globalIsEnvBrowser {
+		globalIsBrowserEnabled = s.GetBrowser()
+	}
+	if !globalIsEnvWORM {
+		globalWORMEnabled = s.GetWorm()
+	}
+	if !globalIsEnvRegion {
+		globalServerRegion = s.GetRegion()
+	}
+	if !globalIsEnvDomainName {
+		globalDomainName = s.Domain
+	}
+	if !globalIsStorageClass {
+		globalStandardStorageClass, globalRRStorageClass = s.GetStorageClass()
+	}
+	if !globalIsDiskCacheEnabled {
+		cacheConf := s.GetCacheConfig()
+		globalCacheDrives = cacheConf.Drives
+		globalCacheExcludes = cacheConf.Exclude
+		globalCacheExpiry = cacheConf.Expiry
+		globalCacheMaxUse = cacheConf.MaxUse
+	}
+	if globalKMS == nil {
+		globalKMSConfig = s.KMS
+		if kms, err := crypto.NewVault(globalKMSConfig); err == nil {
+			globalKMS = kms
+			globalKMSKeyID = globalKMSConfig.Vault.Key.Name
+		}
+	}
+}
+
 // newConfig - initialize a new server config, saves env parameters if
 // found, otherwise use default parameters
-func newConfig() error {
+func newConfig(objAPI ObjectLayer) error {
 	// Initialize server config.
 	srvCfg := newServerConfig()
 
-	// If env is set override the credentials from config file.
-	if globalIsEnvCreds {
-		srvCfg.SetCredential(globalActiveCred)
-	}
+	// Override any values from ENVs.
+	srvCfg.loadFromEnvs()
 
-	if globalIsEnvBrowser {
-		srvCfg.SetBrowser(globalIsBrowserEnabled)
-	}
-
-	if globalIsEnvWORM {
-		srvCfg.SetWorm(globalWORMEnabled)
-	}
-
-	if globalIsEnvRegion {
-		srvCfg.SetRegion(globalServerRegion)
-	}
-
-	if globalIsEnvDomainName {
-		srvCfg.Domain = globalDomainName
-	}
-
-	if globalIsStorageClass {
-		srvCfg.SetStorageClass(globalStandardStorageClass, globalRRStorageClass)
-	}
-
-	if globalIsDiskCacheEnabled {
-		srvCfg.SetCacheConfig(globalCacheDrives, globalCacheExcludes, globalCacheExpiry)
-	}
+	// Load values to cached global values.
+	srvCfg.loadToCachedConfigs()
 
 	// hold the mutex lock before a new config is assigned.
-	// Save the new config globally.
-	// unlock the mutex.
 	globalServerConfigMu.Lock()
 	globalServerConfig = srvCfg
 	globalServerConfigMu.Unlock()
 
 	// Save config into file.
-	return globalServerConfig.Save()
+	return saveServerConfig(objAPI, globalServerConfig)
 }
 
 // getValidConfig - returns valid server configuration
-func getValidConfig() (*serverConfig, error) {
-	srvCfg := &serverConfig{
-		Region:  globalMinioDefaultRegion,
-		Browser: true,
-	}
-
-	if _, err := quick.Load(getConfigFile(), srvCfg); err != nil {
+func getValidConfig(objAPI ObjectLayer) (*serverConfig, error) {
+	srvCfg, err := readServerConfig(context.Background(), objAPI)
+	if err != nil {
 		return nil, err
 	}
 
-	if srvCfg.Version != serverConfigVersion {
-		return nil, fmt.Errorf("configuration version mismatch. Expected: ‘%s’, Got: ‘%s’", serverConfigVersion, srvCfg.Version)
-	}
-
-	// Validate credential fields only when
-	// they are not set via the environment
-	// Error out if global is env credential is not set and config has invalid credential
-	if !globalIsEnvCreds && !srvCfg.Credential.IsValid() {
-		return nil, errors.New("invalid credential in config file " + getConfigFile())
-	}
-
-	return srvCfg, nil
+	return srvCfg, srvCfg.Validate()
 }
 
 // loadConfig - loads a new config from disk, overrides params from env
 // if found and valid
-func loadConfig() error {
-	srvCfg, err := getValidConfig()
+func loadConfig(objAPI ObjectLayer) error {
+	srvCfg, err := getValidConfig(objAPI)
 	if err != nil {
 		return uiErrInvalidConfig(nil).Msg(err.Error())
 	}
 
-	// If env is set override the credentials from config file.
-	if globalIsEnvCreds {
-		srvCfg.SetCredential(globalActiveCred)
-	}
+	// Override any values from ENVs.
+	srvCfg.loadFromEnvs()
 
-	if globalIsEnvBrowser {
-		srvCfg.SetBrowser(globalIsBrowserEnabled)
-	}
-
-	if globalIsEnvRegion {
-		srvCfg.SetRegion(globalServerRegion)
-	}
-
-	if globalIsEnvDomainName {
-		srvCfg.Domain = globalDomainName
-	}
-
-	if globalIsStorageClass {
-		srvCfg.SetStorageClass(globalStandardStorageClass, globalRRStorageClass)
-	}
-
-	if globalIsDiskCacheEnabled {
-		srvCfg.SetCacheConfig(globalCacheDrives, globalCacheExcludes, globalCacheExpiry)
-	}
+	// Load values to cached global values.
+	srvCfg.loadToCachedConfigs()
 
 	// hold the mutex lock before a new config is assigned.
 	globalServerConfigMu.Lock()
 	globalServerConfig = srvCfg
-	if !globalIsEnvCreds {
-		globalActiveCred = globalServerConfig.GetCredential()
-	}
-	if !globalIsEnvBrowser {
-		globalIsBrowserEnabled = globalServerConfig.GetBrowser()
-	}
-	if !globalIsEnvWORM {
-		globalWORMEnabled = globalServerConfig.GetWorm()
-	}
-	if !globalIsEnvRegion {
-		globalServerRegion = globalServerConfig.GetRegion()
-	}
-	if !globalIsEnvDomainName {
-		globalDomainName = globalServerConfig.Domain
-	}
-	if !globalIsStorageClass {
-		globalStandardStorageClass, globalRRStorageClass = globalServerConfig.GetStorageClass()
-	}
-	if !globalIsDiskCacheEnabled {
-		cacheConf := globalServerConfig.GetCacheConfig()
-		globalCacheDrives = cacheConf.Drives
-		globalCacheExcludes = cacheConf.Exclude
-		globalCacheExpiry = cacheConf.Expiry
-	}
 	globalServerConfigMu.Unlock()
 
 	return nil
@@ -367,17 +450,19 @@ func loadConfig() error {
 // * Add a new target in pkg/event/target package.
 // * Add newly added target configuration to serverConfig.Notify.<TARGET_NAME>.
 // * Handle the configuration in this function to create/add into TargetList.
-func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
+func getNotificationTargets(config *serverConfig) *event.TargetList {
 	targetList := event.NewTargetList()
 
 	for id, args := range config.Notify.AMQP {
 		if args.Enable {
 			newTarget, err := target.NewAMQPTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
@@ -386,10 +471,14 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget, err := target.NewElasticsearchTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
+
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
+
 			}
 		}
 	}
@@ -398,10 +487,12 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget, err := target.NewKafkaTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
@@ -410,10 +501,12 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget, err := target.NewMQTTTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
@@ -422,10 +515,12 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget, err := target.NewMySQLTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
@@ -434,10 +529,12 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget, err := target.NewNATSTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
@@ -446,10 +543,12 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget, err := target.NewPostgreSQLTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
@@ -458,10 +557,12 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget, err := target.NewRedisTarget(id, args)
 			if err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 			if err = targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
@@ -470,10 +571,11 @@ func getNotificationTargets(config *serverConfig) (*event.TargetList, error) {
 		if args.Enable {
 			newTarget := target.NewWebhookTarget(id, args)
 			if err := targetList.Add(newTarget); err != nil {
-				return nil, err
+				logger.LogIf(context.Background(), err)
+				continue
 			}
 		}
 	}
 
-	return targetList, nil
+	return targetList
 }

cmd/config-current_test.go

@@ -17,9 +17,8 @@
 package cmd
 
 import (
-	"io/ioutil"
 	"os"
-	"path/filepath"
+	"path"
 	"testing"
 
 	"github.com/minio/minio/pkg/auth"
@@ -27,12 +26,15 @@ import (
 )
 
 func TestServerConfig(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	objLayer, fsDir, err := prepareFS()
 	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(fsDir)
+
+	if err = newTestConfig(globalMinioDefaultRegion, objLayer); err != nil {
 		t.Fatalf("Init Test config failed")
 	}
-	// remove the root directory after the test ends.
-	defer os.RemoveAll(rootPath)
 
 	if globalServerConfig.GetRegion() != globalMinioDefaultRegion {
 		t.Errorf("Expecting region `us-east-1` found %s", globalServerConfig.GetRegion())
@@ -49,16 +51,12 @@ func TestServerConfig(t *testing.T) {
 		t.Errorf("Expecting version %s found %s", globalServerConfig.GetVersion(), serverConfigVersion)
 	}
 
-	// Attempt to save.
-	if err := globalServerConfig.Save(); err != nil {
+	if err := saveServerConfig(objLayer, globalServerConfig); err != nil {
 		t.Fatalf("Unable to save updated config file %s", err)
 	}
 
-	// Do this only once here.
-	setConfigDir(rootPath)
-
 	// Initialize server config.
-	if err := loadConfig(); err != nil {
+	if err := loadConfig(objLayer); err != nil {
 		t.Fatalf("Unable to initialize from updated config file %s", err)
 	}
 }
@@ -82,23 +80,25 @@ func TestServerConfigWithEnvs(t *testing.T) {
 
 	defer resetGlobalIsEnvs()
 
-	// Get test root.
-	rootPath, err := getTestRoot()
+	objLayer, fsDir, err := prepareFS()
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
 	}
+	defer os.RemoveAll(fsDir)
+
+	if err = newTestConfig(globalMinioDefaultRegion, objLayer); err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+
+	globalObjLayerMutex.Lock()
+	globalObjectAPI = objLayer
+	globalObjLayerMutex.Unlock()
 
 	serverHandleEnvVars()
 
-	// Do this only once here.
-	setConfigDir(rootPath)
-
 	// Init config
 	initConfig()
 
-	// remove the root directory after the test ends.
-	defer os.RemoveAll(rootPath)
-
 	// Check if serverConfig has
 	if globalServerConfig.GetBrowser() {
 		t.Errorf("Expecting browser is set to false found %v", globalServerConfig.GetBrowser())
@@ -127,16 +127,17 @@ func TestServerConfigWithEnvs(t *testing.T) {
 
 // Tests config validator..
 func TestValidateConfig(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	objLayer, fsDir, err := prepareFS()
 	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(fsDir)
+
+	if err = newTestConfig(globalMinioDefaultRegion, objLayer); err != nil {
 		t.Fatalf("Init Test config failed")
 	}
 
-	// remove the root directory after the test ends.
-	defer os.RemoveAll(rootPath)
-
-	configPath := filepath.Join(rootPath, minioConfigFile)
-
+	configPath := path.Join(minioConfigPrefix, minioConfigFile)
 	v := serverConfigVersion
 
 	testCases := []struct {
@@ -174,66 +175,66 @@ func TestValidateConfig(t *testing.T) {
 		{`{"version": "` + v + `", "browser": "on", "browser": "on", "region":"us-east-1", "credential" : {"accessKey":"minio", "secretKey":"minio123"}}`, false},
 
 		// Test 11 - Test AMQP
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "amqp": { "1": { "enable": true, "url": "", "exchange": "", "routingKey": "", "exchangeType": "", "mandatory": false, "immediate": false, "durable": false, "internal": false, "noWait": false, "autoDeleted": false }}}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "amqp": { "1": { "enable": true, "url": "", "exchange": "", "routingKey": "", "exchangeType": "", "mandatory": false, "immediate": false, "durable": false, "internal": false, "noWait": false, "autoDeleted": false }}}}`, false},
 
 		// Test 12 - Test NATS
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "nats": { "1": { "enable": true, "address": "", "subject": "", "username": "", "password": "", "token": "", "secure": false, "pingInterval": 0, "streaming": { "enable": false, "clusterID": "", "clientID": "", "async": false, "maxPubAcksInflight": 0 } } }}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "nats": { "1": { "enable": true, "address": "", "subject": "", "username": "", "password": "", "token": "", "secure": false, "pingInterval": 0, "streaming": { "enable": false, "clusterID": "", "clientID": "", "async": false, "maxPubAcksInflight": 0 } } }}}`, false},
 
 		// Test 13 - Test ElasticSearch
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "elasticsearch": { "1": { "enable": true, "url": "", "index": "" } }}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "elasticsearch": { "1": { "enable": true, "url": "", "index": "" } }}}`, false},
 
 		// Test 14 - Test Redis
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "redis": { "1": { "enable": true, "address": "", "password": "", "key": "" } }}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "redis": { "1": { "enable": true, "address": "", "password": "", "key": "" } }}}`, false},
 
 		// Test 15 - Test PostgreSQL
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "postgresql": { "1": { "enable": true, "connectionString": "", "table": "", "host": "", "port": "", "user": "", "password": "", "database": "" }}}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "postgresql": { "1": { "enable": true, "connectionString": "", "table": "", "host": "", "port": "", "user": "", "password": "", "database": "" }}}}`, false},
 
 		// Test 16 - Test Kafka
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "kafka": { "1": { "enable": true, "brokers": null, "topic": "" } }}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "kafka": { "1": { "enable": true, "brokers": null, "topic": "" } }}}`, false},
 
 		// Test 17 - Test Webhook
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "webhook": { "1": { "enable": true, "endpoint": "" } }}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "webhook": { "1": { "enable": true, "endpoint": "" } }}}`, false},
 
 		// Test 18 - Test MySQL
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "mysql": { "1": { "enable": true, "dsnString": "",  "table": "", "host": "", "port": "", "user": "", "password": "", "database": "" }}}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "mysql": { "1": { "enable": true, "dsnString": "",  "table": "", "host": "", "port": "", "user": "", "password": "", "database": "" }}}}`, false},
 
 		// Test 19 - Test Format for MySQL
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "mysql": { "1": { "enable": true, "dsnString": "",  "format": "invalid", "table": "xxx", "host": "10.0.0.1", "port": "3306", "user": "abc", "password": "pqr", "database": "test1" }}}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "mysql": { "1": { "enable": true, "dsnString": "",  "format": "invalid", "table": "xxx", "host": "10.0.0.1", "port": "3306", "user": "abc", "password": "pqr", "database": "test1" }}}}`, false},
 
 		// Test 20 - Test valid Format for MySQL
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "mysql": { "1": { "enable": true, "dsnString": "",  "format": "namespace", "table": "xxx", "host": "10.0.0.1", "port": "3306", "user": "abc", "password": "pqr", "database": "test1" }}}}`, true},
 
 		// Test 21 - Test Format for PostgreSQL
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "postgresql": { "1": { "enable": true, "connectionString": "", "format": "invalid", "table": "xxx", "host": "myhost", "port": "5432", "user": "abc", "password": "pqr", "database": "test1" }}}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "postgresql": { "1": { "enable": true, "connectionString": "", "format": "invalid", "table": "xxx", "host": "myhost", "port": "5432", "user": "abc", "password": "pqr", "database": "test1" }}}}`, false},
 
 		// Test 22 - Test valid Format for PostgreSQL
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "postgresql": { "1": { "enable": true, "connectionString": "", "format": "namespace", "table": "xxx", "host": "myhost", "port": "5432", "user": "abc", "password": "pqr", "database": "test1" }}}}`, true},
 
 		// Test 23 - Test Format for ElasticSearch
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "elasticsearch": { "1": { "enable": true, "format": "invalid", "url": "example.com", "index": "myindex" } }}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "elasticsearch": { "1": { "enable": true, "format": "invalid", "url": "example.com", "index": "myindex" } }}}`, false},
 
 		// Test 24 - Test valid Format for ElasticSearch
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "elasticsearch": { "1": { "enable": true, "format": "namespace", "url": "example.com", "index": "myindex" } }}}`, true},
 
 		// Test 25 - Test Format for Redis
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "redis": { "1": { "enable": true, "format": "invalid", "address": "example.com:80", "password": "xxx", "key": "key1" } }}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "redis": { "1": { "enable": true, "format": "invalid", "address": "example.com:80", "password": "xxx", "key": "key1" } }}}`, false},
 
 		// Test 26 - Test valid Format for Redis
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "redis": { "1": { "enable": true, "format": "namespace", "address": "example.com:80", "password": "xxx", "key": "key1" } }}}`, true},
 
 		// Test 27 - Test MQTT
-		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "mqtt": { "1": { "enable": true, "broker": "",  "topic": "", "qos": 0, "clientId": "", "username": "", "password": ""}}}}`, true},
+		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "mqtt": { "1": { "enable": true, "broker": "",  "topic": "", "qos": 0, "clientId": "", "username": "", "password": ""}}}}`, false},
 	}
 
 	for i, testCase := range testCases {
-		if werr := ioutil.WriteFile(configPath, []byte(testCase.configData), 0700); werr != nil {
-			t.Fatal(werr)
+		if err = saveConfig(objLayer, configPath, []byte(testCase.configData)); err != nil {
+			t.Fatal(err)
 		}
-		_, verr := getValidConfig()
-		if testCase.shouldPass && verr != nil {
-			t.Errorf("Test %d, should pass but it failed with err = %v", i+1, verr)
+		_, err = getValidConfig(objLayer)
+		if testCase.shouldPass && err != nil {
+			t.Errorf("Test %d, should pass but it failed with err = %v", i+1, err)
 		}
-		if !testCase.shouldPass && verr == nil {
+		if !testCase.shouldPass && err == nil {
 			t.Errorf("Test %d, should fail but it succeeded.", i+1)
 		}
 	}
@@ -319,6 +320,18 @@ func TestConfigDiff(t *testing.T) {
 			&serverConfig{Notify: notifier{MQTT: map[string]target.MQTTArgs{"1": {Enable: false}}}},
 			"MQTT Notification configuration differs",
 		},
+		// 16
+		{
+			&serverConfig{Logger: loggerConfig{
+				Console: loggerConsole{Enabled: true},
+				HTTP:    map[string]loggerHTTP{"1": {Endpoint: "http://address1"}},
+			}},
+			&serverConfig{Logger: loggerConfig{
+				Console: loggerConsole{Enabled: true},
+				HTTP:    map[string]loggerHTTP{"1": {Endpoint: "http://address2"}},
+			}},
+			"Logger configuration differs",
+		},
 	}
 
 	for i, testCase := range testCases {

cmd/config-dir.go

@@ -28,9 +28,6 @@ const (
 	// Default minio configuration directory where below configuration files/directories are stored.
 	defaultMinioConfigDir = ".minio"
 
-	// Minio configuration file.
-	minioConfigFile = "config.json"
-
 	// Directory contains below files/directories for HTTPS configuration.
 	certsDir = "certs"
 

cmd/config-migrate.go

@@ -17,12 +17,16 @@
 package cmd
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"path"
 	"path/filepath"
 
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/auth"
+	"github.com/minio/minio/pkg/dns"
 	"github.com/minio/minio/pkg/event"
 	"github.com/minio/minio/pkg/event/target"
 	xnet "github.com/minio/minio/pkg/net"
@@ -32,7 +36,22 @@ import (
 // DO NOT EDIT following message template, please open a github issue to discuss instead.
 var configMigrateMSGTemplate = "Configuration file %s migrated from version '%s' to '%s' successfully."
 
-// Migrates all config versions from "1" to "18".
+// Save config file to corresponding backend
+func Save(configFile string, data interface{}) error {
+	return quick.SaveConfig(data, configFile, globalEtcdClient)
+}
+
+// Load config from backend
+func Load(configFile string, data interface{}) (quick.Config, error) {
+	return quick.LoadConfig(configFile, globalEtcdClient, data)
+}
+
+// GetVersion gets config version from backend
+func GetVersion(configFile string) (string, error) {
+	return quick.GetVersion(configFile, globalEtcdClient)
+}
+
+// Migrates all config versions from "1" to "28".
 func migrateConfig() error {
 	// Purge all configs with version '1',
 	// this is a special case since version '1' used
@@ -42,8 +61,11 @@ func migrateConfig() error {
 	}
 
 	// Load only config version information.
-	version, err := quick.GetVersion(getConfigFile())
+	version, err := GetVersion(getConfigFile())
 	if err != nil {
+		if os.IsNotExist(err) {
+			return nil
+		}
 		return err
 	}
 
@@ -182,6 +204,21 @@ func migrateConfig() error {
 			return err
 		}
 		fallthrough
+	case "25":
+		if err = migrateV25ToV26(); err != nil {
+			return err
+		}
+		fallthrough
+	case "26":
+		if err = migrateV26ToV27(); err != nil {
+			return err
+		}
+		fallthrough
+	case "27":
+		if err = migrateV27ToV28(); err != nil {
+			return err
+		}
+		fallthrough
 	case serverConfigVersion:
 		// No migration needed. this always points to current version.
 		err = nil
@@ -194,8 +231,8 @@ func purgeV1() error {
 	configFile := filepath.Join(getConfigDir(), "fsUsers.json")
 
 	cv1 := &configV1{}
-	_, err := quick.Load(configFile, cv1)
-	if os.IsNotExist(err) {
+	_, err := Load(configFile, cv1)
+	if os.IsNotExist(err) || err == dns.ErrNoEntriesFound {
 		return nil
 	} else if err != nil {
 		return fmt.Errorf("Unable to load config version ‘1’. %v", err)
@@ -215,7 +252,7 @@ func migrateV2ToV3() error {
 	configFile := getConfigFile()
 
 	cv2 := &configV2{}
-	_, err := quick.Load(configFile, cv2)
+	_, err := Load(configFile, cv2)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -259,7 +296,7 @@ func migrateV2ToV3() error {
 	}
 	srvConfig.Logger.Syslog = slogger
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv2.Version, srvConfig.Version, err)
 	}
 
@@ -274,7 +311,7 @@ func migrateV3ToV4() error {
 	configFile := getConfigFile()
 
 	cv3 := &configV3{}
-	_, err := quick.Load(configFile, cv3)
+	_, err := Load(configFile, cv3)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -297,7 +334,7 @@ func migrateV3ToV4() error {
 	srvConfig.Logger.File = cv3.Logger.File
 	srvConfig.Logger.Syslog = cv3.Logger.Syslog
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv3.Version, srvConfig.Version, err)
 	}
 
@@ -312,7 +349,7 @@ func migrateV4ToV5() error {
 	configFile := getConfigFile()
 
 	cv4 := &configV4{}
-	_, err := quick.Load(configFile, cv4)
+	_, err := Load(configFile, cv4)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -338,7 +375,7 @@ func migrateV4ToV5() error {
 	srvConfig.Logger.ElasticSearch.Enable = false
 	srvConfig.Logger.Redis.Enable = false
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv4.Version, srvConfig.Version, err)
 	}
 
@@ -353,7 +390,7 @@ func migrateV5ToV6() error {
 	configFile := getConfigFile()
 
 	cv5 := &configV5{}
-	_, err := quick.Load(configFile, cv5)
+	_, err := Load(configFile, cv5)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -427,7 +464,7 @@ func migrateV5ToV6() error {
 		}
 	}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv5.Version, srvConfig.Version, err)
 	}
 
@@ -442,7 +479,7 @@ func migrateV6ToV7() error {
 	configFile := getConfigFile()
 
 	cv6 := &configV6{}
-	_, err := quick.Load(configFile, cv6)
+	_, err := Load(configFile, cv6)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -483,7 +520,7 @@ func migrateV6ToV7() error {
 		srvConfig.Notify.Redis = cv6.Notify.Redis
 	}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv6.Version, srvConfig.Version, err)
 	}
 
@@ -498,7 +535,7 @@ func migrateV7ToV8() error {
 	configFile := getConfigFile()
 
 	cv7 := &serverConfigV7{}
-	_, err := quick.Load(configFile, cv7)
+	_, err := Load(configFile, cv7)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -546,7 +583,7 @@ func migrateV7ToV8() error {
 		srvConfig.Notify.Redis = cv7.Notify.Redis
 	}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv7.Version, srvConfig.Version, err)
 	}
 
@@ -560,7 +597,7 @@ func migrateV8ToV9() error {
 	configFile := getConfigFile()
 
 	cv8 := &serverConfigV8{}
-	_, err := quick.Load(configFile, cv8)
+	_, err := Load(configFile, cv8)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -616,7 +653,7 @@ func migrateV8ToV9() error {
 		srvConfig.Notify.PostgreSQL = cv8.Notify.PostgreSQL
 	}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv8.Version, srvConfig.Version, err)
 	}
 
@@ -630,7 +667,7 @@ func migrateV9ToV10() error {
 	configFile := getConfigFile()
 
 	cv9 := &serverConfigV9{}
-	_, err := quick.Load(configFile, cv9)
+	_, err := Load(configFile, cv9)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -684,7 +721,7 @@ func migrateV9ToV10() error {
 		srvConfig.Notify.PostgreSQL = cv9.Notify.PostgreSQL
 	}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv9.Version, srvConfig.Version, err)
 	}
 
@@ -698,7 +735,7 @@ func migrateV10ToV11() error {
 	configFile := getConfigFile()
 
 	cv10 := &serverConfigV10{}
-	_, err := quick.Load(configFile, cv10)
+	_, err := Load(configFile, cv10)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -755,7 +792,7 @@ func migrateV10ToV11() error {
 	srvConfig.Notify.Kafka = make(map[string]target.KafkaArgs)
 	srvConfig.Notify.Kafka["1"] = target.KafkaArgs{}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv10.Version, srvConfig.Version, err)
 	}
 
@@ -769,7 +806,7 @@ func migrateV11ToV12() error {
 	configFile := getConfigFile()
 
 	cv11 := &serverConfigV11{}
-	_, err := quick.Load(configFile, cv11)
+	_, err := Load(configFile, cv11)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -853,7 +890,7 @@ func migrateV11ToV12() error {
 		}
 	}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv11.Version, srvConfig.Version, err)
 	}
 
@@ -866,7 +903,7 @@ func migrateV12ToV13() error {
 	configFile := getConfigFile()
 
 	cv12 := &serverConfigV12{}
-	_, err := quick.Load(configFile, cv12)
+	_, err := Load(configFile, cv12)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -933,7 +970,7 @@ func migrateV12ToV13() error {
 	srvConfig.Notify.Webhook = make(map[string]target.WebhookArgs)
 	srvConfig.Notify.Webhook["1"] = target.WebhookArgs{}
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv12.Version, srvConfig.Version, err)
 	}
 
@@ -946,7 +983,7 @@ func migrateV13ToV14() error {
 	configFile := getConfigFile()
 
 	cv13 := &serverConfigV13{}
-	_, err := quick.Load(configFile, cv13)
+	_, err := Load(configFile, cv13)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1018,7 +1055,7 @@ func migrateV13ToV14() error {
 	// Set the new browser parameter to true by default
 	srvConfig.Browser = true
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv13.Version, srvConfig.Version, err)
 	}
 
@@ -1031,7 +1068,7 @@ func migrateV14ToV15() error {
 	configFile := getConfigFile()
 
 	cv14 := &serverConfigV14{}
-	_, err := quick.Load(configFile, cv14)
+	_, err := Load(configFile, cv14)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1107,7 +1144,7 @@ func migrateV14ToV15() error {
 	// Load browser config from existing config in the file.
 	srvConfig.Browser = cv14.Browser
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv14.Version, srvConfig.Version, err)
 	}
 
@@ -1121,7 +1158,7 @@ func migrateV15ToV16() error {
 	configFile := getConfigFile()
 
 	cv15 := &serverConfigV15{}
-	_, err := quick.Load(configFile, cv15)
+	_, err := Load(configFile, cv15)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1197,7 +1234,7 @@ func migrateV15ToV16() error {
 	// Load browser config from existing config in the file.
 	srvConfig.Browser = cv15.Browser
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv15.Version, srvConfig.Version, err)
 	}
 
@@ -1211,7 +1248,7 @@ func migrateV16ToV17() error {
 	configFile := getConfigFile()
 
 	cv16 := &serverConfigV16{}
-	_, err := quick.Load(configFile, cv16)
+	_, err := Load(configFile, cv16)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1318,7 +1355,7 @@ func migrateV16ToV17() error {
 	// Load browser config from existing config in the file.
 	srvConfig.Browser = cv16.Browser
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv16.Version, srvConfig.Version, err)
 	}
 
@@ -1332,7 +1369,7 @@ func migrateV17ToV18() error {
 	configFile := getConfigFile()
 
 	cv17 := &serverConfigV17{}
-	_, err := quick.Load(configFile, cv17)
+	_, err := Load(configFile, cv17)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1422,7 +1459,7 @@ func migrateV17ToV18() error {
 	// Load browser config from existing config in the file.
 	srvConfig.Browser = cv17.Browser
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv17.Version, srvConfig.Version, err)
 	}
 
@@ -1434,7 +1471,7 @@ func migrateV18ToV19() error {
 	configFile := getConfigFile()
 
 	cv18 := &serverConfigV18{}
-	_, err := quick.Load(configFile, cv18)
+	_, err := Load(configFile, cv18)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1528,7 +1565,7 @@ func migrateV18ToV19() error {
 	// Load browser config from existing config in the file.
 	srvConfig.Browser = cv18.Browser
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv18.Version, srvConfig.Version, err)
 	}
 
@@ -1540,7 +1577,7 @@ func migrateV19ToV20() error {
 	configFile := getConfigFile()
 
 	cv19 := &serverConfigV19{}
-	_, err := quick.Load(configFile, cv19)
+	_, err := Load(configFile, cv19)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1633,7 +1670,7 @@ func migrateV19ToV20() error {
 	// Load browser config from existing config in the file.
 	srvConfig.Browser = cv19.Browser
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv19.Version, srvConfig.Version, err)
 	}
 
@@ -1645,7 +1682,7 @@ func migrateV20ToV21() error {
 	configFile := getConfigFile()
 
 	cv20 := &serverConfigV20{}
-	_, err := quick.Load(configFile, cv20)
+	_, err := Load(configFile, cv20)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1737,7 +1774,7 @@ func migrateV20ToV21() error {
 	// Load domain config from existing config in the file.
 	srvConfig.Domain = cv20.Domain
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv20.Version, srvConfig.Version, err)
 	}
 
@@ -1749,7 +1786,7 @@ func migrateV21ToV22() error {
 	configFile := getConfigFile()
 
 	cv21 := &serverConfigV21{}
-	_, err := quick.Load(configFile, cv21)
+	_, err := Load(configFile, cv21)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1841,7 +1878,7 @@ func migrateV21ToV22() error {
 	// Load domain config from existing config in the file.
 	srvConfig.Domain = cv21.Domain
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv21.Version, srvConfig.Version, err)
 	}
 
@@ -1853,7 +1890,7 @@ func migrateV22ToV23() error {
 	configFile := getConfigFile()
 
 	cv22 := &serverConfigV22{}
-	_, err := quick.Load(configFile, cv22)
+	_, err := Load(configFile, cv22)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -1954,7 +1991,7 @@ func migrateV22ToV23() error {
 	srvConfig.Cache.Exclude = []string{}
 	srvConfig.Cache.Expiry = globalCacheExpiry
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = Save(configFile, srvConfig); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv22.Version, srvConfig.Version, err)
 	}
 
@@ -1966,7 +2003,7 @@ func migrateV23ToV24() error {
 	configFile := getConfigFile()
 
 	cv23 := &serverConfigV23{}
-	_, err := quick.Load(configFile, cv23)
+	_, err := quick.LoadConfig(configFile, globalEtcdClient, cv23)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -2067,7 +2104,7 @@ func migrateV23ToV24() error {
 	srvConfig.Cache.Exclude = cv23.Cache.Exclude
 	srvConfig.Cache.Expiry = cv23.Cache.Expiry
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = quick.SaveConfig(srvConfig, configFile, globalEtcdClient); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv23.Version, srvConfig.Version, err)
 	}
 
@@ -2079,7 +2116,7 @@ func migrateV24ToV25() error {
 	configFile := getConfigFile()
 
 	cv24 := &serverConfigV24{}
-	_, err := quick.Load(configFile, cv24)
+	_, err := quick.LoadConfig(configFile, globalEtcdClient, cv24)
 	if os.IsNotExist(err) {
 		return nil
 	} else if err != nil {
@@ -2185,10 +2222,228 @@ func migrateV24ToV25() error {
 	srvConfig.Cache.Exclude = cv24.Cache.Exclude
 	srvConfig.Cache.Expiry = cv24.Cache.Expiry
 
-	if err = quick.Save(configFile, srvConfig); err != nil {
+	if err = quick.SaveConfig(srvConfig, configFile, globalEtcdClient); err != nil {
 		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv24.Version, srvConfig.Version, err)
 	}
 
 	logger.Info(configMigrateMSGTemplate, configFile, cv24.Version, srvConfig.Version)
 	return nil
 }
+
+func migrateV25ToV26() error {
+	configFile := getConfigFile()
+
+	cv25 := &serverConfigV25{}
+	_, err := quick.LoadConfig(configFile, globalEtcdClient, cv25)
+	if os.IsNotExist(err) {
+		return nil
+	} else if err != nil {
+		return fmt.Errorf("Unable to load config version ‘25’. %v", err)
+	}
+	if cv25.Version != "25" {
+		return nil
+	}
+
+	// Copy over fields from V25 into V26 config struct
+	srvConfig := &serverConfigV26{
+		Notify: notifier{},
+	}
+	srvConfig.Version = "26"
+	srvConfig.Credential = cv25.Credential
+	srvConfig.Region = cv25.Region
+	if srvConfig.Region == "" {
+		// Region needs to be set for AWS Signature Version 4.
+		srvConfig.Region = globalMinioDefaultRegion
+	}
+
+	if len(cv25.Notify.AMQP) == 0 {
+		srvConfig.Notify.AMQP = make(map[string]target.AMQPArgs)
+		srvConfig.Notify.AMQP["1"] = target.AMQPArgs{}
+	} else {
+		srvConfig.Notify.AMQP = cv25.Notify.AMQP
+	}
+	if len(cv25.Notify.Elasticsearch) == 0 {
+		srvConfig.Notify.Elasticsearch = make(map[string]target.ElasticsearchArgs)
+		srvConfig.Notify.Elasticsearch["1"] = target.ElasticsearchArgs{
+			Format: event.NamespaceFormat,
+		}
+	} else {
+		srvConfig.Notify.Elasticsearch = cv25.Notify.Elasticsearch
+	}
+	if len(cv25.Notify.Redis) == 0 {
+		srvConfig.Notify.Redis = make(map[string]target.RedisArgs)
+		srvConfig.Notify.Redis["1"] = target.RedisArgs{
+			Format: event.NamespaceFormat,
+		}
+	} else {
+		srvConfig.Notify.Redis = cv25.Notify.Redis
+	}
+	if len(cv25.Notify.PostgreSQL) == 0 {
+		srvConfig.Notify.PostgreSQL = make(map[string]target.PostgreSQLArgs)
+		srvConfig.Notify.PostgreSQL["1"] = target.PostgreSQLArgs{
+			Format: event.NamespaceFormat,
+		}
+	} else {
+		srvConfig.Notify.PostgreSQL = cv25.Notify.PostgreSQL
+	}
+	if len(cv25.Notify.Kafka) == 0 {
+		srvConfig.Notify.Kafka = make(map[string]target.KafkaArgs)
+		srvConfig.Notify.Kafka["1"] = target.KafkaArgs{}
+	} else {
+		srvConfig.Notify.Kafka = cv25.Notify.Kafka
+	}
+	if len(cv25.Notify.NATS) == 0 {
+		srvConfig.Notify.NATS = make(map[string]target.NATSArgs)
+		srvConfig.Notify.NATS["1"] = target.NATSArgs{}
+	} else {
+		srvConfig.Notify.NATS = cv25.Notify.NATS
+	}
+	if len(cv25.Notify.Webhook) == 0 {
+		srvConfig.Notify.Webhook = make(map[string]target.WebhookArgs)
+		srvConfig.Notify.Webhook["1"] = target.WebhookArgs{}
+	} else {
+		srvConfig.Notify.Webhook = cv25.Notify.Webhook
+	}
+	if len(cv25.Notify.MySQL) == 0 {
+		srvConfig.Notify.MySQL = make(map[string]target.MySQLArgs)
+		srvConfig.Notify.MySQL["1"] = target.MySQLArgs{
+			Format: event.NamespaceFormat,
+		}
+	} else {
+		srvConfig.Notify.MySQL = cv25.Notify.MySQL
+	}
+
+	if len(cv25.Notify.MQTT) == 0 {
+		srvConfig.Notify.MQTT = make(map[string]target.MQTTArgs)
+		srvConfig.Notify.MQTT["1"] = target.MQTTArgs{}
+	} else {
+		srvConfig.Notify.MQTT = cv25.Notify.MQTT
+	}
+
+	// Load browser config from existing config in the file.
+	srvConfig.Browser = cv25.Browser
+
+	// Load worm config from existing config in the file.
+	srvConfig.Worm = cv25.Worm
+
+	// Load domain config from existing config in the file.
+	srvConfig.Domain = cv25.Domain
+
+	// Load storage class config from existing storage class config in the file.
+	srvConfig.StorageClass.RRS = cv25.StorageClass.RRS
+	srvConfig.StorageClass.Standard = cv25.StorageClass.Standard
+
+	// Load cache config from existing cache config in the file.
+	srvConfig.Cache.Drives = cv25.Cache.Drives
+	srvConfig.Cache.Exclude = cv25.Cache.Exclude
+	srvConfig.Cache.Expiry = cv25.Cache.Expiry
+
+	// Add predefined value to new server config.
+	srvConfig.Cache.MaxUse = globalCacheMaxUse
+
+	if err = quick.SaveConfig(srvConfig, configFile, globalEtcdClient); err != nil {
+		return fmt.Errorf("Failed to migrate config from ‘%s’ to ‘%s’. %v", cv25.Version, srvConfig.Version, err)
+	}
+
+	logger.Info(configMigrateMSGTemplate, configFile, cv25.Version, srvConfig.Version)
+	return nil
+}
+
+func migrateV26ToV27() error {
+	configFile := getConfigFile()
+
+	// config V27 is backward compatible with V26, load the old
+	// config file in serverConfigV27 struct and put some examples
+	// in the new `logger` field
+	srvConfig := &serverConfigV27{}
+	_, err := quick.LoadConfig(configFile, globalEtcdClient, srvConfig)
+	if os.IsNotExist(err) {
+		return nil
+	} else if err != nil {
+		return fmt.Errorf("Unable to load config file. %v", err)
+	}
+
+	if srvConfig.Version != "26" {
+		return nil
+	}
+
+	srvConfig.Version = "27"
+	// Enable console logging by default to avoid breaking users
+	// current deployments
+	srvConfig.Logger.Console.Enabled = true
+	srvConfig.Logger.HTTP = make(map[string]loggerHTTP)
+	srvConfig.Logger.HTTP["1"] = loggerHTTP{}
+
+	if err = quick.SaveConfig(srvConfig, configFile, globalEtcdClient); err != nil {
+		return fmt.Errorf("Failed to migrate config from ‘26’ to ‘27’. %v", err)
+	}
+
+	logger.Info(configMigrateMSGTemplate, configFile, "26", "27")
+	return nil
+}
+
+func migrateV27ToV28() error {
+	configFile := getConfigFile()
+
+	// config V28 is backward compatible with V27, load the old
+	// config file in serverConfigV28 struct and initialize KMSConfig
+	srvConfig := &serverConfigV28{}
+	_, err := quick.LoadConfig(configFile, globalEtcdClient, srvConfig)
+	if os.IsNotExist(err) {
+		return nil
+	} else if err != nil {
+		return fmt.Errorf("Unable to load config file. %v", err)
+	}
+
+	if srvConfig.Version != "27" {
+		return nil
+	}
+
+	srvConfig.Version = "28"
+	srvConfig.KMS = crypto.KMSConfig{}
+	if err = quick.SaveConfig(srvConfig, configFile, globalEtcdClient); err != nil {
+		return fmt.Errorf("Failed to migrate config from ‘27’ to ‘28’. %v", err)
+	}
+
+	logger.Info(configMigrateMSGTemplate, configFile, "27", "28")
+	return nil
+}
+
+// Migrates '.minio.sys/config.json' v27 to v28.
+func migrateMinioSysConfig(objAPI ObjectLayer) error {
+	// Construct path to config.json for the given bucket.
+	configFile := path.Join(bucketConfigPrefix, minioConfigFile)
+	transactionConfigFile := configFile + ".transaction"
+
+	// As object layer's GetObject() and PutObject() take respective lock on minioMetaBucket
+	// and configFile, take a transaction lock to avoid race.
+	objLock := globalNSMutex.NewNSLock(minioMetaBucket, transactionConfigFile)
+	if err := objLock.GetLock(globalOperationTimeout); err != nil {
+		return err
+	}
+	defer objLock.Unlock()
+
+	return migrateV27ToV28MinioSys(objAPI)
+}
+
+func migrateV27ToV28MinioSys(objAPI ObjectLayer) error {
+	configFile := path.Join(minioConfigPrefix, minioConfigFile)
+	srvConfig, err := readServerConfig(context.Background(), objAPI)
+	if err == errConfigNotFound {
+		return nil
+	} else if err != nil {
+		return fmt.Errorf("Unable to load config file. %v", err)
+	}
+	if srvConfig.Version != "27" {
+		return nil
+	}
+
+	srvConfig.Version = "28"
+	srvConfig.KMS = crypto.KMSConfig{}
+	if err = saveServerConfig(objAPI, srvConfig); err != nil {
+		return fmt.Errorf("Failed to migrate config from ‘27’ to ‘28’. %v", err)
+	}
+
+	logger.Info(configMigrateMSGTemplate, configFile, "27", "28")
+	return nil
+}

cmd/config-migrate_test.go

@@ -25,15 +25,26 @@ import (
 
 // Test if config v1 is purged
 func TestServerConfigMigrateV1(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	objLayer, fsDir, err := prepareFS()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(fsDir)
+	err = newTestConfig(globalMinioDefaultRegion, objLayer)
 	if err != nil {
 		t.Fatalf("Init Test config failed")
 	}
-	// remove the root directory after the test ends.
+	rootPath, err := ioutil.TempDir(globalTestTmpDir, "minio-")
+	if err != nil {
+		t.Fatal(err)
+	}
 	defer os.RemoveAll(rootPath)
-
 	setConfigDir(rootPath)
 
+	globalObjLayerMutex.Lock()
+	globalObjectAPI = objLayer
+	globalObjLayerMutex.Unlock()
+
 	// Create a V1 config json file and store it
 	configJSON := "{ \"version\":\"1\", \"accessKeyId\":\"abcde\", \"secretAccessKey\":\"abcdefgh\"}"
 	configPath := rootPath + "/fsUsers.json"
@@ -45,13 +56,14 @@ func TestServerConfigMigrateV1(t *testing.T) {
 	if err := migrateConfig(); err != nil {
 		t.Fatal("Unexpected error: ", err)
 	}
+
 	// Check if config v1 is removed from filesystem
 	if _, err := os.Stat(configPath); err == nil || !os.IsNotExist(err) {
 		t.Fatal("Config V1 file is not purged")
 	}
 
 	// Initialize server config and check again if everything is fine
-	if err := loadConfig(); err != nil {
+	if err := loadConfig(objLayer); err != nil {
 		t.Fatalf("Unable to initialize from updated config file %s", err)
 	}
 }
@@ -59,20 +71,13 @@ func TestServerConfigMigrateV1(t *testing.T) {
 // Test if all migrate code returns nil when config file does not
 // exist
 func TestServerConfigMigrateInexistentConfig(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	rootPath, err := ioutil.TempDir(globalTestTmpDir, "minio-")
 	if err != nil {
-		t.Fatalf("Init Test config failed")
+		t.Fatal(err)
 	}
-	// remove the root directory after the test ends.
 	defer os.RemoveAll(rootPath)
 
 	setConfigDir(rootPath)
-	configPath := rootPath + "/" + minioConfigFile
-
-	// Remove config file
-	if err := os.Remove(configPath); err != nil {
-		t.Fatal("Unexpected error: ", err)
-	}
 
 	if err := migrateV2ToV3(); err != nil {
 		t.Fatal("migrate v2 to v3 should succeed when no config file is found")
@@ -134,18 +139,45 @@ func TestServerConfigMigrateInexistentConfig(t *testing.T) {
 	if err := migrateV21ToV22(); err != nil {
 		t.Fatal("migrate v21 to v22 should succeed when no config file is found")
 	}
+	if err := migrateV22ToV23(); err != nil {
+		t.Fatal("migrate v22 to v23 should succeed when no config file is found")
+	}
+	if err := migrateV23ToV24(); err != nil {
+		t.Fatal("migrate v23 to v24 should succeed when no config file is found")
+	}
+	if err := migrateV24ToV25(); err != nil {
+		t.Fatal("migrate v24 to v25 should succeed when no config file is found")
+	}
+	if err := migrateV25ToV26(); err != nil {
+		t.Fatal("migrate v25 to v26 should succeed when no config file is found")
+	}
+	if err := migrateV26ToV27(); err != nil {
+		t.Fatal("migrate v26 to v27 should succeed when no config file is found")
+	}
+	if err := migrateV27ToV28(); err != nil {
+		t.Fatal("migrate v27 to v28 should succeed when no config file is found")
+	}
 }
 
-// Test if a config migration from v2 to v23 is successfully done
-func TestServerConfigMigrateV2toV23(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+// Test if a config migration from v2 to v28 is successfully done
+func TestServerConfigMigrateV2toV28(t *testing.T) {
+	rootPath, err := ioutil.TempDir(globalTestTmpDir, "minio-")
 	if err != nil {
-		t.Fatalf("Init Test config failed")
+		t.Fatal(err)
 	}
-	// remove the root directory after the test ends.
 	defer os.RemoveAll(rootPath)
-
 	setConfigDir(rootPath)
+
+	objLayer, fsDir, err := prepareFS()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(fsDir)
+
+	globalObjLayerMutex.Lock()
+	globalObjectAPI = objLayer
+	globalObjLayerMutex.Unlock()
+
 	configPath := rootPath + "/" + minioConfigFile
 
 	// Create a corrupted config file
@@ -171,8 +203,12 @@ func TestServerConfigMigrateV2toV23(t *testing.T) {
 		t.Fatal("Unexpected error: ", err)
 	}
 
+	if err := migrateConfigToMinioSys(); err != nil {
+		t.Fatal("Unexpected error: ", err)
+	}
+
 	// Initialize server config and check again if everything is fine
-	if err := loadConfig(); err != nil {
+	if err := loadConfig(newObjectLayerFn()); err != nil {
 		t.Fatalf("Unable to initialize from updated config file %s", err)
 	}
 
@@ -193,13 +229,11 @@ func TestServerConfigMigrateV2toV23(t *testing.T) {
 
 // Test if all migrate code returns error with corrupted config files
 func TestServerConfigMigrateFaultyConfig(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	rootPath, err := ioutil.TempDir(globalTestTmpDir, "minio-")
 	if err != nil {
-		t.Fatalf("Init Test config failed")
+		t.Fatal(err)
 	}
-	// remove the root directory after the test ends.
 	defer os.RemoveAll(rootPath)
-
 	setConfigDir(rootPath)
 	configPath := rootPath + "/" + minioConfigFile
 
@@ -272,17 +306,31 @@ func TestServerConfigMigrateFaultyConfig(t *testing.T) {
 	if err := migrateV22ToV23(); err == nil {
 		t.Fatal("migrateConfigV22ToV23() should fail with a corrupted json")
 	}
+	if err := migrateV23ToV24(); err == nil {
+		t.Fatal("migrateConfigV23ToV24() should fail with a corrupted json")
+	}
+	if err := migrateV24ToV25(); err == nil {
+		t.Fatal("migrateConfigV24ToV25() should fail with a corrupted json")
+	}
+	if err := migrateV25ToV26(); err == nil {
+		t.Fatal("migrateConfigV25ToV26() should fail with a corrupted json")
+	}
+	if err := migrateV26ToV27(); err == nil {
+		t.Fatal("migrateConfigV26ToV27() should fail with a corrupted json")
+	}
+
+	if err := migrateV27ToV28(); err == nil {
+		t.Fatal("migrateConfigV27ToV28() should fail with a corrupted json")
+	}
 }
 
 // Test if all migrate code returns error with corrupted config files
 func TestServerConfigMigrateCorruptedConfig(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	rootPath, err := ioutil.TempDir(globalTestTmpDir, "minio-")
 	if err != nil {
-		t.Fatalf("Init Test config failed")
+		t.Fatal(err)
 	}
-	// remove the root directory after the test ends.
 	defer os.RemoveAll(rootPath)
-
 	setConfigDir(rootPath)
 	configPath := rootPath + "/" + minioConfigFile
 

cmd/config-versions.go

@@ -19,8 +19,10 @@ package cmd
 import (
 	"sync"
 
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/pkg/auth"
 	"github.com/minio/minio/pkg/event/target"
+	"github.com/minio/minio/pkg/quick"
 )
 
 /////////////////// Config V1 ///////////////////
@@ -633,6 +635,8 @@ type serverConfigV24 struct {
 // IMPORTANT NOTE: When updating this struct make sure that
 // serverConfig.ConfigDiff() is updated as necessary.
 type serverConfigV25 struct {
+	quick.Config `json:"-"` // ignore interfaces
+
 	Version string `json:"version"`
 
 	// S3 API configuration.
@@ -651,3 +655,104 @@ type serverConfigV25 struct {
 	// Notification queue configuration.
 	Notify notifier `json:"notify"`
 }
+
+// serverConfigV26 is just like version '25', stores additionally
+// cache max use value in 'CacheConfig'.
+type serverConfigV26 struct {
+	quick.Config `json:"-"` // ignore interfaces
+
+	Version string `json:"version"`
+
+	// S3 API configuration.
+	Credential auth.Credentials `json:"credential"`
+	Region     string           `json:"region"`
+	Browser    BoolFlag         `json:"browser"`
+	Worm       BoolFlag         `json:"worm"`
+	Domain     string           `json:"domain"`
+
+	// Storage class configuration
+	StorageClass storageClassConfig `json:"storageclass"`
+
+	// Cache configuration
+	Cache CacheConfig `json:"cache"`
+
+	// Notification queue configuration.
+	Notify notifier `json:"notify"`
+}
+
+type loggerConsole struct {
+	Enabled bool `json:"enabled"`
+}
+
+type loggerHTTP struct {
+	Enabled  bool   `json:"enabled"`
+	Endpoint string `json:"endpoint"`
+}
+
+type loggerConfig struct {
+	Console loggerConsole         `json:"console"`
+	HTTP    map[string]loggerHTTP `json:"http"`
+}
+
+// serverConfigV27 is just like version '26', stores additionally
+// the logger field
+//
+// IMPORTANT NOTE: When updating this struct make sure that
+// serverConfig.ConfigDiff() is updated as necessary.
+type serverConfigV27 struct {
+	quick.Config `json:"-"` // ignore interfaces
+
+	Version string `json:"version"`
+
+	// S3 API configuration.
+	Credential auth.Credentials `json:"credential"`
+	Region     string           `json:"region"`
+	Browser    BoolFlag         `json:"browser"`
+	Worm       BoolFlag         `json:"worm"`
+	Domain     string           `json:"domain"`
+
+	// Storage class configuration
+	StorageClass storageClassConfig `json:"storageclass"`
+
+	// Cache configuration
+	Cache CacheConfig `json:"cache"`
+
+	// Notification queue configuration.
+	Notify notifier `json:"notify"`
+
+	// Logger configuration
+	Logger loggerConfig `json:"logger"`
+}
+
+// serverConfigV28 is just like version '27', additionally
+// storing KMS config
+//
+// IMPORTANT NOTE: When updating this struct make sure that
+// serverConfig.ConfigDiff() is updated as necessary.
+type serverConfigV28 struct {
+	quick.Config `json:"-"` // ignore interfaces
+
+	Version string `json:"version"`
+
+	// S3 API configuration.
+	Credential auth.Credentials `json:"credential"`
+	Region     string           `json:"region"`
+	Browser    BoolFlag         `json:"browser"`
+	Worm       BoolFlag         `json:"worm"`
+	Domain     string           `json:"domain"`
+
+	// Storage class configuration
+	StorageClass storageClassConfig `json:"storageclass"`
+
+	// Cache configuration
+	Cache CacheConfig `json:"cache"`
+
+	// KMS configuration
+	KMS crypto.KMSConfig `json:"kms"`
+
+	// Notification queue configuration.
+	Notify notifier `json:"notify"`
+
+	// Logger configuration
+	Logger loggerConfig `json:"logger"`
+}

cmd/config.go

@@ -0,0 +1,267 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"io/ioutil"
+	"path"
+	"runtime"
+	"time"
+
+	"github.com/minio/minio/cmd/logger"
+	"github.com/minio/minio/pkg/hash"
+	"github.com/minio/minio/pkg/quick"
+)
+
+const (
+	minioConfigPrefix = "config"
+
+	// Minio configuration file.
+	minioConfigFile = "config.json"
+)
+
+func saveServerConfig(objAPI ObjectLayer, config *serverConfig) error {
+	if err := quick.CheckData(config); err != nil {
+		return err
+	}
+
+	data, err := json.Marshal(config)
+	if err != nil {
+		return err
+	}
+
+	configFile := path.Join(minioConfigPrefix, minioConfigFile)
+	if globalEtcdClient != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+		_, err := globalEtcdClient.Put(ctx, configFile, string(data))
+		defer cancel()
+		return err
+	}
+
+	return saveConfig(objAPI, configFile, data)
+}
+
+func readConfigEtcd(configFile string) ([]byte, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+	resp, err := globalEtcdClient.Get(ctx, configFile)
+	defer cancel()
+	if err != nil {
+		return nil, err
+	}
+	if resp.Count == 0 {
+		return nil, errConfigNotFound
+	}
+	for _, ev := range resp.Kvs {
+		if string(ev.Key) == configFile {
+			return ev.Value, nil
+		}
+	}
+	return nil, errConfigNotFound
+}
+
+func readServerConfig(ctx context.Context, objAPI ObjectLayer) (*serverConfig, error) {
+	var configData []byte
+	var err error
+	configFile := path.Join(minioConfigPrefix, minioConfigFile)
+	if globalEtcdClient != nil {
+		configData, err = readConfigEtcd(configFile)
+	} else {
+		var reader io.Reader
+		reader, err = readConfig(ctx, objAPI, configFile)
+		if err != nil {
+			return nil, err
+		}
+		configData, err = ioutil.ReadAll(reader)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	if runtime.GOOS == "windows" {
+		configData = bytes.Replace(configData, []byte("\r\n"), []byte("\n"), -1)
+	}
+
+	if err = quick.CheckDuplicateKeys(string(configData)); err != nil {
+		return nil, err
+	}
+
+	var config = &serverConfig{}
+	if err := json.Unmarshal(configData, config); err != nil {
+		return nil, err
+	}
+
+	if err := quick.CheckData(config); err != nil {
+		return nil, err
+	}
+
+	return config, nil
+}
+
+func checkServerConfigEtcd(configFile string) error {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+	resp, err := globalEtcdClient.Get(ctx, configFile)
+	defer cancel()
+	if err != nil {
+		return err
+	}
+	if resp.Count == 0 {
+		return errConfigNotFound
+	}
+	return nil
+}
+
+func checkServerConfig(ctx context.Context, objAPI ObjectLayer) error {
+	configFile := path.Join(minioConfigPrefix, minioConfigFile)
+	if globalEtcdClient != nil {
+		return checkServerConfigEtcd(configFile)
+	}
+
+	if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile); err != nil {
+		if isErrObjectNotFound(err) {
+			return errConfigNotFound
+		}
+		logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
+		logger.LogIf(ctx, err)
+		return err
+	}
+	return nil
+}
+
+func saveConfig(objAPI ObjectLayer, configFile string, data []byte) error {
+	hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data))
+	if err != nil {
+		return err
+	}
+
+	_, err = objAPI.PutObject(context.Background(), minioMetaBucket, configFile, hashReader, nil)
+	return err
+}
+
+var errConfigNotFound = errors.New("config file not found")
+
+func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) (*bytes.Buffer, error) {
+	var buffer bytes.Buffer
+	// Read entire content by setting size to -1
+	if err := objAPI.GetObject(ctx, minioMetaBucket, configFile, 0, -1, &buffer, ""); err != nil {
+		// Ignore if err is ObjectNotFound or IncompleteBody when bucket is not configured with notification
+		if isErrObjectNotFound(err) || isErrIncompleteBody(err) || isInsufficientReadQuorum(err) {
+			return nil, errConfigNotFound
+		}
+
+		logger.GetReqInfo(ctx).AppendTags("configFile", configFile)
+		logger.LogIf(ctx, err)
+		return nil, err
+	}
+
+	// Return config not found on empty content.
+	if buffer.Len() == 0 {
+		return nil, errConfigNotFound
+	}
+
+	return &buffer, nil
+}
+
+// ConfigSys - config system.
+type ConfigSys struct{}
+
+// Load - load config.json.
+func (sys *ConfigSys) Load(objAPI ObjectLayer) error {
+	return sys.Init(objAPI)
+}
+
+// Init - initializes config system from config.json.
+func (sys *ConfigSys) Init(objAPI ObjectLayer) error {
+	if objAPI == nil {
+		return errInvalidArgument
+	}
+	return loadConfig(objAPI)
+}
+
+// NewConfigSys - creates new config system object.
+func NewConfigSys() *ConfigSys {
+	return &ConfigSys{}
+}
+
+// Migrates ${HOME}/.minio/config.json to '<export_path>/.minio.sys/config/minio.json'
+func migrateConfigToMinioSys() error {
+	// Construct path to config.json for the given bucket.
+	configFile := path.Join(bucketConfigPrefix, minioConfigFile)
+	transactionConfigFile := configFile + ".transaction"
+
+	// As object layer's GetObject() and PutObject() take respective lock on minioMetaBucket
+	// and configFile, take a transaction lock to avoid race.
+	objLock := globalNSMutex.NewNSLock(minioMetaBucket, transactionConfigFile)
+	if err := objLock.GetLock(globalOperationTimeout); err != nil {
+		return err
+	}
+	defer objLock.Unlock()
+
+	// Verify if backend already has the file.
+	if err := checkServerConfig(context.Background(), newObjectLayerFn()); err != errConfigNotFound {
+		return err
+	} // if errConfigNotFound proceed to migrate..
+
+	var config = &serverConfig{}
+	if _, err := Load(getConfigFile(), config); err != nil {
+		return err
+	}
+
+	return saveServerConfig(newObjectLayerFn(), config)
+}
+
+// Initialize and load config from remote etcd or local config directory
+func initConfig() {
+	if globalEtcdClient != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+		resp, err := globalEtcdClient.Get(ctx, getConfigFile())
+		cancel()
+		if err == nil && resp.Count > 0 {
+			logger.FatalIf(migrateConfig(), "Config migration failed")
+		}
+	} else {
+		if isFile(getConfigFile()) {
+			logger.FatalIf(migrateConfig(), "Config migration failed")
+
+			// Migrates ${HOME}/.minio/config.json to '<export_path>/.minio.sys/config/config.json'
+			if err := migrateConfigToMinioSys(); err != nil {
+				logger.Fatal(err, "Unable to migrate 'config.json' to '.minio.sys/config/config.json'")
+			}
+		}
+	}
+	objAPI := newObjectLayerFn()
+	if objAPI == nil {
+		logger.FatalIf(errServerNotInitialized, "Server is not initialized yet unable to proceed")
+	}
+	if err := checkServerConfig(context.Background(), objAPI); err != nil {
+		if err == errConfigNotFound {
+			// Config file does not exist, we create it fresh and return upon success.
+			logger.FatalIf(newConfig(objAPI), "Unable to initialize minio config for the first time")
+			logger.Info("Created minio configuration file successfully at " + getConfigDir())
+		} else {
+			logger.FatalIf(err, "Unable to load the configuration file")
+		}
+	}
+
+	logger.FatalIf(migrateMinioSysConfig(objAPI), "Config migration failed for minio.sys config")
+
+	logger.FatalIf(loadConfig(objAPI), "Unable to load the configuration file")
+}

cmd/crypto/config.go

@@ -0,0 +1,20 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+// KMSConfig has the KMS config for hashicorp vault
+type KMSConfig struct {
+	Vault VaultConfig `json:"vault"`
+}

cmd/crypto/doc.go

@@ -0,0 +1,116 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package crypto implements AWS S3 related cryptographic building blocks
+// for implementing Server-Side-Encryption (SSE-S3) and Server-Side-Encryption
+// with customer provided keys (SSE-C).
+//
+// All objects are encrypted with an unique and randomly generated 'ObjectKey'.
+// The ObjectKey itself is never stored in plaintext. Instead it is only stored
+// in a sealed from. The sealed 'ObjectKey' is created by encrypting the 'ObjectKey'
+// with an unique key-encryption-key. Given the correct key-encryption-key the
+// sealed 'ObjectKey' can be unsealed and the object can be decrypted.
+//
+//
+// ## SSE-C
+//
+// SSE-C computes the key-encryption-key from the client-provided key, an
+// initialization vector (IV) and the bucket/object path.
+//
+// 1. Encrypt:
+//       Input: ClientKey, bucket, object, metadata, object_data
+//       -              IV := Random({0,1}²⁵⁶)
+//       -       ObjectKey := SHA256(ClientKey || Random({0,1}²⁵⁶))
+//       -       KeyEncKey := HMAC-SHA256(ClientKey, IV || 'SSE-C' || 'DAREv2-HMAC-SHA256' || bucket || '/' || object)
+//       -       SealedKey := DAREv2_Enc(KeyEncKey, ObjectKey)
+//       - enc_object_data := DAREv2_Enc(ObjectKey, object_data)
+//       -        metadata <- IV
+//       -        metadata <- SealedKey
+//       Output: enc_object_data, metadata
+//
+// 2. Decrypt:
+//       Input: ClientKey, bucket, object, metadata, enc_object_data
+//       -          IV <- metadata
+//       -   SealedKey <- metadata
+//       -   KeyEncKey := HMAC-SHA256(ClientKey, IV || 'SSE-C' || 'DAREv2-HMAC-SHA256' || bucket || '/' || object)
+//       -   ObjectKey := DAREv2_Dec(KeyEncKey, SealedKey)
+//       - object_data := DAREv2_Dec(ObjectKey, enc_object_data)
+//       Output: object_data
+//
+//
+// ## SSE-S3
+//
+// SSE-S3 can use either a master key or a KMS as root-of-trust.
+// The en/decryption slightly depens upon which root-of-trust is used.
+//
+// ### SSE-S3 and single master key
+//
+// The master key is used to derive unique object- and key-encryption-keys.
+// SSE-S3 with a single master key works as SSE-C where the master key is
+// used as the client-provided key.
+//
+// 1. Encrypt:
+//       Input: MasterKey, bucket, object, metadata, object_data
+//       -              IV := Random({0,1}²⁵⁶)
+//       -       ObjectKey := SHA256(MasterKey || Random({0,1}²⁵⁶))
+//       -       KeyEncKey := HMAC-SHA256(MasterKey, IV || 'SSE-S3' || 'DAREv2-HMAC-SHA256' || bucket || '/' || object)
+//       -       SealedKey := DAREv2_Enc(KeyEncKey, ObjectKey)
+//       - enc_object_data := DAREv2_Enc(ObjectKey, object_data)
+//       -        metadata <- IV
+//       -        metadata <- SealedKey
+//       Output: enc_object_data, metadata
+//
+// 2. Decrypt:
+//       Input: MasterKey, bucket, object, metadata, enc_object_data
+//       -          IV <- metadata
+//       -   SealedKey <- metadata
+//       -   KeyEncKey := HMAC-SHA256(MasterKey, IV || 'SSE-S3' || 'DAREv2-HMAC-SHA256' || bucket || '/' || object)
+//       -   ObjectKey := DAREv2_Dec(KeyEncKey, SealedKey)
+//       - object_data := DAREv2_Dec(ObjectKey, enc_object_data)
+//       Output: object_data
+//
+//
+// ### SSE-S3 and KMS
+//
+// SSE-S3 requires that the KMS provides two functions:
+//       1.       Generate(KeyID) -> (Key, EncKey)
+//       2. Unseal(KeyID, EncKey) -> Key
+//
+// 1. Encrypt:
+//       Input: KeyID, bucket, object, metadata, object_data
+//       -     Key, EncKey := Generate(KeyID)
+//       -              IV := Random({0,1}²⁵⁶)
+//       -       ObjectKey := SHA256(Key, Random({0,1}²⁵⁶))
+//       -       KeyEncKey := HMAC-SHA256(Key, IV || 'SSE-S3' || 'DAREv2-HMAC-SHA256' || bucket || '/' || object)
+//       -       SealedKey := DAREv2_Enc(KeyEncKey, ObjectKey)
+//       - enc_object_data := DAREv2_Enc(ObjectKey, object_data)
+//       -        metadata <- IV
+//       -        metadata <- KeyID
+//       -        metadata <- EncKey
+//       -        metadata <- SealedKey
+//       Output: enc_object_data, metadata
+//
+// 2. Decrypt:
+//       Input: bucket, object, metadata, enc_object_data
+//       -      KeyID  <- metadata
+//       -      EncKey <- metadata
+//       -          IV <- metadata
+//       -   SealedKey <- metadata
+//       -         Key := Unseal(KeyID, EncKey)
+//       -   KeyEncKey := HMAC-SHA256(Key, IV || 'SSE-S3' || 'DAREv2-HMAC-SHA256' || bucket || '/' || object)
+//       -   ObjectKey := DAREv2_Dec(KeyEncKey, SealedKey)
+//       - object_data := DAREv2_Dec(ObjectKey, enc_object_data)
+//       Output: object_data
+//
+package crypto

cmd/crypto/error.go

@@ -0,0 +1,67 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import "errors"
+
+// Error is the generic type for any error happening during decrypting
+// an object. It indicates that the object itself or its metadata was
+// modified accidentally or maliciously.
+type Error struct{ msg string }
+
+func (e Error) Error() string { return e.msg }
+
+var (
+	// ErrInvalidEncryptionMethod indicates that the specified SSE encryption method
+	// is not supported.
+	ErrInvalidEncryptionMethod = errors.New("The encryption method is not supported")
+
+	// ErrInvalidCustomerAlgorithm indicates that the specified SSE-C algorithm
+	// is not supported.
+	ErrInvalidCustomerAlgorithm = errors.New("The SSE-C algorithm is not supported")
+
+	// ErrMissingCustomerKey indicates that the HTTP headers contains no SSE-C client key.
+	ErrMissingCustomerKey = errors.New("The SSE-C request is missing the customer key")
+
+	// ErrMissingCustomerKeyMD5 indicates that the HTTP headers contains no SSE-C client key
+	// MD5 checksum.
+	ErrMissingCustomerKeyMD5 = errors.New("The SSE-C request is missing the customer key MD5")
+
+	// ErrInvalidCustomerKey indicates that the SSE-C client key is not valid - e.g. not a
+	// base64-encoded string or not 256 bits long.
+	ErrInvalidCustomerKey = errors.New("The SSE-C client key is invalid")
+
+	// ErrCustomerKeyMD5Mismatch indicates that the SSE-C key MD5 does not match the
+	// computed MD5 sum. This means that the client provided either the wrong key for
+	// a certain MD5 checksum or the wrong MD5 for a certain key.
+	ErrCustomerKeyMD5Mismatch = errors.New("The provided SSE-C key MD5 does not match the computed MD5 of the SSE-C key")
+	// ErrIncompatibleEncryptionMethod indicates that both SSE-C headers and SSE-S3 headers were specified, and are incompatible
+	// The client needs to remove the SSE-S3 header or the SSE-C headers
+	ErrIncompatibleEncryptionMethod = errors.New("Server side encryption specified with both SSE-C and SSE-S3 headers")
+)
+
+var (
+	errMissingInternalIV            = Error{"The object metadata is missing the internal encryption IV"}
+	errMissingInternalSealAlgorithm = Error{"The object metadata is missing the internal seal algorithm"}
+
+	errInvalidInternalIV            = Error{"The internal encryption IV is malformed"}
+	errInvalidInternalSealAlgorithm = Error{"The internal seal algorithm is invalid and not supported"}
+)
+
+var (
+	// errOutOfEntropy indicates that the a source of randomness (PRNG) wasn't able
+	// to produce enough random data. This is fatal error and should cause a panic.
+	errOutOfEntropy = errors.New("Unable to read enough randomness from the system")
+)

cmd/crypto/header.go

@@ -0,0 +1,214 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/base64"
+	"net/http"
+	"strings"
+)
+
+// SSEHeader is the general AWS SSE HTTP header key.
+const SSEHeader = "X-Amz-Server-Side-Encryption"
+
+const (
+	// SSEKmsID is the HTTP header key referencing the SSE-KMS
+	// key ID.
+	SSEKmsID = SSEHeader + "-Aws-Kms-Key-Id"
+
+	// SSEKmsContext is the HTTP header key referencing the
+	// SSE-KMS encryption context.
+	SSEKmsContext = SSEHeader + "-Context"
+)
+
+const (
+	// SSECAlgorithm is the HTTP header key referencing
+	// the SSE-C algorithm.
+	SSECAlgorithm = SSEHeader + "-Customer-Algorithm"
+
+	// SSECKey is the HTTP header key referencing the
+	// SSE-C client-provided key..
+	SSECKey = SSEHeader + "-Customer-Key"
+
+	// SSECKeyMD5 is the HTTP header key referencing
+	// the MD5 sum of the client-provided key.
+	SSECKeyMD5 = SSEHeader + "-Customer-Key-Md5"
+)
+
+const (
+	// SSECopyAlgorithm is the HTTP header key referencing
+	// the SSE-C algorithm for SSE-C copy requests.
+	SSECopyAlgorithm = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm"
+
+	// SSECopyKey is the HTTP header key referencing the SSE-C
+	// client-provided key for SSE-C copy requests.
+	SSECopyKey = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key"
+
+	// SSECopyKeyMD5 is the HTTP header key referencing the
+	// MD5 sum of the client key for SSE-C copy requests.
+	SSECopyKeyMD5 = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5"
+)
+
+const (
+	// SSEAlgorithmAES256 is the only supported value for the SSE-S3 or SSE-C algorithm header.
+	// For SSE-S3 see: https://docs.aws.amazon.com/AmazonS3/latest/dev/SSEUsingRESTAPI.html
+	// For SSE-C  see: https://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html
+	SSEAlgorithmAES256 = "AES256"
+
+	// SSEAlgorithmKMS is the value of 'X-Amz-Server-Side-Encryption' for SSE-KMS.
+	// See: https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingKMSEncryption.html
+	SSEAlgorithmKMS = "aws:kms"
+)
+
+// S3 represents AWS SSE-S3. It provides functionality to handle
+// SSE-S3 requests.
+var S3 = s3{}
+
+type s3 struct{}
+
+// IsRequested returns true if the HTTP headers indicates that
+// the S3 client requests SSE-S3.
+func (s3) IsRequested(h http.Header) bool {
+	_, ok := h[SSEHeader]
+	return ok && strings.ToLower(h.Get(SSEHeader)) != SSEAlgorithmKMS // Return only true if the SSE header is specified and does not contain the SSE-KMS value
+}
+
+// ParseHTTP parses the SSE-S3 related HTTP headers and checks
+// whether they contain valid values.
+func (s3) ParseHTTP(h http.Header) (err error) {
+	if h.Get(SSEHeader) != SSEAlgorithmAES256 {
+		err = ErrInvalidEncryptionMethod
+	}
+	return
+}
+
+// S3KMS represents AWS SSE-KMS. It provides functionality to
+// handle SSE-KMS requests.
+var S3KMS = s3KMS{}
+
+type s3KMS struct{}
+
+// IsRequested returns true if the HTTP headers indicates that
+// the S3 client requests SSE-KMS.
+func (s3KMS) IsRequested(h http.Header) bool {
+	if _, ok := h[SSEKmsID]; ok {
+		return true
+	}
+	if _, ok := h[SSEKmsContext]; ok {
+		return true
+	}
+	if _, ok := h[SSEHeader]; ok {
+		return strings.ToUpper(h.Get(SSEHeader)) != SSEAlgorithmAES256 // Return only true if the SSE header is specified and does not contain the SSE-S3 value
+	}
+	return false
+}
+
+var (
+	// SSEC represents AWS SSE-C. It provides functionality to handle
+	// SSE-C requests.
+	SSEC = ssec{}
+
+	// SSECopy represents AWS SSE-C for copy requests. It provides
+	// functionality to handle SSE-C copy requests.
+	SSECopy = ssecCopy{}
+)
+
+type ssec struct{}
+type ssecCopy struct{}
+
+// IsRequested returns true if the HTTP headers contains
+// at least one SSE-C header. SSE-C copy headers are ignored.
+func (ssec) IsRequested(h http.Header) bool {
+	if _, ok := h[SSECAlgorithm]; ok {
+		return true
+	}
+	if _, ok := h[SSECKey]; ok {
+		return true
+	}
+	if _, ok := h[SSECKeyMD5]; ok {
+		return true
+	}
+	return false
+}
+
+// IsRequested returns true if the HTTP headers contains
+// at least one SSE-C copy header. Regular SSE-C headers
+// are ignored.
+func (ssecCopy) IsRequested(h http.Header) bool {
+	if _, ok := h[SSECopyAlgorithm]; ok {
+		return true
+	}
+	if _, ok := h[SSECopyKey]; ok {
+		return true
+	}
+	if _, ok := h[SSECopyKeyMD5]; ok {
+		return true
+	}
+	return false
+}
+
+// ParseHTTP parses the SSE-C headers and returns the SSE-C client key
+// on success. SSE-C copy headers are ignored.
+func (ssec) ParseHTTP(h http.Header) (key [32]byte, err error) {
+	defer h.Del(SSECKey) // remove SSE-C key from headers after parsing
+	if h.Get(SSECAlgorithm) != SSEAlgorithmAES256 {
+		return key, ErrInvalidCustomerAlgorithm
+	}
+	if h.Get(SSECKey) == "" {
+		return key, ErrMissingCustomerKey
+	}
+	if h.Get(SSECKeyMD5) == "" {
+		return key, ErrMissingCustomerKeyMD5
+	}
+
+	clientKey, err := base64.StdEncoding.DecodeString(h.Get(SSECKey))
+	if err != nil || len(clientKey) != 32 { // The client key must be 256 bits long
+		return key, ErrInvalidCustomerKey
+	}
+	keyMD5, err := base64.StdEncoding.DecodeString(h.Get(SSECKeyMD5))
+	if md5Sum := md5.Sum(clientKey); err != nil || !bytes.Equal(md5Sum[:], keyMD5) {
+		return key, ErrCustomerKeyMD5Mismatch
+	}
+	copy(key[:], clientKey)
+	return key, nil
+}
+
+// ParseHTTP parses the SSE-C copy headers and returns the SSE-C client key
+// on success. Regular SSE-C headers are ignored.
+func (ssecCopy) ParseHTTP(h http.Header) (key [32]byte, err error) {
+	defer h.Del(SSECopyKey) // remove SSE-C copy key of source object from headers after parsing
+	if h.Get(SSECopyAlgorithm) != SSEAlgorithmAES256 {
+		return key, ErrInvalidCustomerAlgorithm
+	}
+	if h.Get(SSECopyKey) == "" {
+		return key, ErrMissingCustomerKey
+	}
+	if h.Get(SSECopyKeyMD5) == "" {
+		return key, ErrMissingCustomerKeyMD5
+	}
+
+	clientKey, err := base64.StdEncoding.DecodeString(h.Get(SSECopyKey))
+	if err != nil || len(clientKey) != 32 { // The client key must be 256 bits long
+		return key, ErrInvalidCustomerKey
+	}
+	keyMD5, err := base64.StdEncoding.DecodeString(h.Get(SSECopyKeyMD5))
+	if md5Sum := md5.Sum(clientKey); err != nil || !bytes.Equal(md5Sum[:], keyMD5) {
+		return key, ErrCustomerKeyMD5Mismatch
+	}
+	copy(key[:], clientKey)
+	return key, nil
+}

cmd/crypto/header_test.go

@@ -0,0 +1,339 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"net/http"
+	"testing"
+)
+
+var kmsIsRequestedTests = []struct {
+	Header   http.Header
+	Expected bool
+}{
+	{Header: http.Header{}, Expected: false},                                                                                     // 0
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"aws:kms"}}, Expected: true},                                   // 1
+	{Header: http.Header{"X-Amz-Server-Side-Encryption-Aws-Kms-Key-Id": []string{"0839-9047947-844842874-481"}}, Expected: true}, // 2
+	{Header: http.Header{"X-Amz-Server-Side-Encryption-Context": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true},          // 3
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption":                []string{""},
+			"X-Amz-Server-Side-Encryption-Aws-Kms-Key-Id": []string{""},
+			"X-Amz-Server-Side-Encryption-Context":        []string{""},
+		},
+		Expected: true,
+	}, // 4
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption":                []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Aws-Kms-Key-Id": []string{""},
+		},
+		Expected: true,
+	}, // 5
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES256"}}, Expected: false}, // 6
+}
+
+func TestKMSIsRequested(t *testing.T) {
+	for i, test := range kmsIsRequestedTests {
+		if got := S3KMS.IsRequested(test.Header); got != test.Expected {
+			t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
+		}
+	}
+}
+
+var s3IsRequestedTests = []struct {
+	Header   http.Header
+	Expected bool
+}{
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES256"}}, Expected: true},         // 0
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES-256"}}, Expected: true},        // 1
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{""}}, Expected: true},               // 2
+	{Header: http.Header{"X-Amz-Server-Side-Encryptio": []string{"AES256"}}, Expected: false},         // 3
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{SSEAlgorithmKMS}}, Expected: false}, // 4
+}
+
+func TestS3IsRequested(t *testing.T) {
+	for i, test := range s3IsRequestedTests {
+		if got := S3.IsRequested(test.Header); got != test.Expected {
+			t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
+		}
+	}
+}
+
+var s3ParseTests = []struct {
+	Header      http.Header
+	ExpectedErr error
+}{
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES256"}}, ExpectedErr: nil},                         // 0
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{"AES-256"}}, ExpectedErr: ErrInvalidEncryptionMethod}, // 1
+	{Header: http.Header{"X-Amz-Server-Side-Encryption": []string{""}}, ExpectedErr: ErrInvalidEncryptionMethod},        // 2
+	{Header: http.Header{"X-Amz-Server-Side-Encryptio": []string{"AES256"}}, ExpectedErr: ErrInvalidEncryptionMethod},   // 3
+}
+
+func TestS3Parse(t *testing.T) {
+	for i, test := range s3ParseTests {
+		if err := S3.ParseHTTP(test.Header); err != test.ExpectedErr {
+			t.Errorf("Test %d: Wanted '%v' but got '%v'", i, test.ExpectedErr, err)
+		}
+	}
+}
+
+var ssecIsRequestedTests = []struct {
+	Header   http.Header
+	Expected bool
+}{
+	{Header: http.Header{}, Expected: false},                                                                                                     // 0
+	{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"}}, Expected: true},                                 // 1
+	{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}}, Expected: true}, // 2
+	{Header: http.Header{"X-Amz-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true},                 // 3
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{""},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{""},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{""},
+		},
+		Expected: true,
+	}, // 4
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		Expected: true,
+	}, // 5
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		Expected: false,
+	}, // 6
+}
+
+func TestSSECIsRequested(t *testing.T) {
+	for i, test := range ssecIsRequestedTests {
+		if got := SSEC.IsRequested(test.Header); got != test.Expected {
+			t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
+		}
+	}
+}
+
+var ssecCopyIsRequestedTests = []struct {
+	Header   http.Header
+	Expected bool
+}{
+	{Header: http.Header{}, Expected: false},                                                                                                                 // 0
+	{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"}}, Expected: true},                                 // 1
+	{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key": []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}}, Expected: true}, // 2
+	{Header: http.Header{"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5": []string{"7PpPLAK26ONlVUGOWlusfg=="}}, Expected: true},                 // 3
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{""},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{""},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{""},
+		},
+		Expected: true,
+	}, // 4
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		Expected: true,
+	}, // 5
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		Expected: false,
+	}, // 6
+}
+
+func TestSSECopyIsRequested(t *testing.T) {
+	for i, test := range ssecCopyIsRequestedTests {
+		if got := SSECopy.IsRequested(test.Header); got != test.Expected {
+			t.Errorf("Test %d: Wanted %v but got %v", i, test.Expected, got)
+		}
+	}
+}
+
+var ssecParseTests = []struct {
+	Header      http.Header
+	ExpectedErr error
+}{
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: nil, // 0
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES-256"}, // invalid algorithm
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrInvalidCustomerAlgorithm, // 1
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{""}, // no client key
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrMissingCustomerKey, // 2
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRr.ZXltdXN0cHJvdmlkZWQ="}, // invalid key
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrInvalidCustomerKey, // 3
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{""}, // no key MD5
+		},
+		ExpectedErr: ErrMissingCustomerKeyMD5, // 4
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"DzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}, // wrong client key
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 5
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Server-Side-Encryption-Customer-Key-Md5":   []string{".7PpPLAK26ONlVUGOWlusfg=="}, // wrong key MD5
+		},
+		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 6
+	},
+}
+
+func TestSSECParse(t *testing.T) {
+	var zeroKey [32]byte
+	for i, test := range ssecParseTests {
+		key, err := SSEC.ParseHTTP(test.Header)
+		if err != test.ExpectedErr {
+			t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
+		}
+
+		if err != nil && key != zeroKey {
+			t.Errorf("Test %d: parsing failed and client key is not zero key", i)
+		}
+		if err == nil && key == zeroKey {
+			t.Errorf("Test %d: parsed client key is zero key", i)
+		}
+		if _, ok := test.Header[SSECKey]; ok {
+			t.Errorf("Test %d: client key is not removed from HTTP headers after parsing", i)
+		}
+	}
+}
+
+var ssecCopyParseTests = []struct {
+	Header      http.Header
+	ExpectedErr error
+}{
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: nil, // 0
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES-256"}, // invalid algorithm
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrInvalidCustomerAlgorithm, // 1
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{""}, // no client key
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrMissingCustomerKey, // 2
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRr.ZXltdXN0cHJvdmlkZWQ="}, // invalid key
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrInvalidCustomerKey, // 3
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{""}, // no key MD5
+		},
+		ExpectedErr: ErrMissingCustomerKeyMD5, // 4
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"DzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="}, // wrong client key
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{"7PpPLAK26ONlVUGOWlusfg=="},
+		},
+		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 5
+	},
+	{
+		Header: http.Header{
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm": []string{"AES256"},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key":       []string{"MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ="},
+			"X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-Md5":   []string{".7PpPLAK26ONlVUGOWlusfg=="}, // wrong key MD5
+		},
+		ExpectedErr: ErrCustomerKeyMD5Mismatch, // 6
+	},
+}
+
+func TestSSECopyParse(t *testing.T) {
+	var zeroKey [32]byte
+	for i, test := range ssecCopyParseTests {
+		key, err := SSECopy.ParseHTTP(test.Header)
+		if err != test.ExpectedErr {
+			t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
+		}
+
+		if err != nil && key != zeroKey {
+			t.Errorf("Test %d: parsing failed and client key is not zero key", i)
+		}
+		if err == nil && key == zeroKey {
+			t.Errorf("Test %d: parsed client key is zero key", i)
+		}
+		if _, ok := test.Header[SSECKey]; ok {
+			t.Errorf("Test %d: client key is not removed from HTTP headers after parsing", i)
+		}
+	}
+}

cmd/crypto/key.go

@@ -0,0 +1,142 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"bytes"
+	"context"
+	"crypto/hmac"
+	"crypto/rand"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"path"
+
+	"github.com/minio/minio/cmd/logger"
+	sha256 "github.com/minio/sha256-simd"
+	"github.com/minio/sio"
+)
+
+// ObjectKey is a 256 bit secret key used to encrypt the object.
+// It must never be stored in plaintext.
+type ObjectKey [32]byte
+
+// GenerateKey generates a unique ObjectKey from a 256 bit external key
+// and a source of randomness. If random is nil the default PRNG of the
+// system (crypto/rand) is used.
+func GenerateKey(extKey [32]byte, random io.Reader) (key ObjectKey) {
+	if random == nil {
+		random = rand.Reader
+	}
+	var nonce [32]byte
+	if _, err := io.ReadFull(random, nonce[:]); err != nil {
+		logger.CriticalIf(context.Background(), errOutOfEntropy)
+	}
+	sha := sha256.New()
+	sha.Write(extKey[:])
+	sha.Write(nonce[:])
+	sha.Sum(key[:0])
+	return key
+}
+
+// GenerateIV generates a new random 256 bit IV from the provided source
+// of randomness. If random is nil the default PRNG of the system
+// (crypto/rand) is used.
+func GenerateIV(random io.Reader) (iv [32]byte) {
+	if random == nil {
+		random = rand.Reader
+	}
+	if _, err := io.ReadFull(random, iv[:]); err != nil {
+		logger.CriticalIf(context.Background(), errOutOfEntropy)
+	}
+	return iv
+}
+
+// SealedKey represents a sealed object key. It can be stored
+// at an untrusted location.
+type SealedKey struct {
+	Key       [64]byte // The encrypted and authenticted object-key.
+	IV        [32]byte // The random IV used to encrypt the object-key.
+	Algorithm string   // The sealing algorithm used to encrypt the object key.
+}
+
+// Seal encrypts the ObjectKey using the 256 bit external key and IV. The sealed
+// key is also cryptographically bound to the object's path (bucket/object) and the
+// domain (SSE-C or SSE-S3).
+func (key ObjectKey) Seal(extKey, iv [32]byte, domain, bucket, object string) SealedKey {
+	var (
+		sealingKey   [32]byte
+		encryptedKey bytes.Buffer
+	)
+	mac := hmac.New(sha256.New, extKey[:])
+	mac.Write(iv[:])
+	mac.Write([]byte(domain))
+	mac.Write([]byte(SealAlgorithm))
+	mac.Write([]byte(path.Join(bucket, object))) // use path.Join for canonical 'bucket/object'
+	mac.Sum(sealingKey[:0])
+	if n, err := sio.Encrypt(&encryptedKey, bytes.NewReader(key[:]), sio.Config{Key: sealingKey[:]}); n != 64 || err != nil {
+		logger.CriticalIf(context.Background(), errors.New("Unable to generate sealed key"))
+	}
+	sealedKey := SealedKey{
+		IV:        iv,
+		Algorithm: SealAlgorithm,
+	}
+	copy(sealedKey.Key[:], encryptedKey.Bytes())
+	return sealedKey
+}
+
+// Unseal decrypts a sealed key using the 256 bit external key. Since the sealed key
+// may be cryptographically bound to the object's path the same bucket/object as during sealing
+// must be provided. On success the ObjectKey contains the decrypted sealed key.
+func (key *ObjectKey) Unseal(extKey [32]byte, sealedKey SealedKey, domain, bucket, object string) error {
+	var (
+		unsealConfig sio.Config
+		decryptedKey bytes.Buffer
+	)
+	switch sealedKey.Algorithm {
+	default:
+		return Error{fmt.Sprintf("The sealing algorithm '%s' is not supported", sealedKey.Algorithm)}
+	case SealAlgorithm:
+		mac := hmac.New(sha256.New, extKey[:])
+		mac.Write(sealedKey.IV[:])
+		mac.Write([]byte(domain))
+		mac.Write([]byte(SealAlgorithm))
+		mac.Write([]byte(path.Join(bucket, object))) // use path.Join for canonical 'bucket/object'
+		unsealConfig = sio.Config{MinVersion: sio.Version20, Key: mac.Sum(nil)}
+	case InsecureSealAlgorithm:
+		sha := sha256.New()
+		sha.Write(extKey[:])
+		sha.Write(sealedKey.IV[:])
+		unsealConfig = sio.Config{MinVersion: sio.Version10, Key: sha.Sum(nil)}
+	}
+
+	if n, err := sio.Decrypt(&decryptedKey, bytes.NewReader(sealedKey.Key[:]), unsealConfig); n != 32 || err != nil {
+		return err // TODO(aead): upgrade sio to use sio.Error
+	}
+	copy(key[:], decryptedKey.Bytes())
+	return nil
+}
+
+// DerivePartKey derives an unique 256 bit key from an ObjectKey and the part index.
+func (key ObjectKey) DerivePartKey(id uint32) (partKey [32]byte) {
+	var bin [4]byte
+	binary.LittleEndian.PutUint32(bin[:], id)
+
+	mac := hmac.New(sha256.New, key[:])
+	mac.Write(bin[:])
+	mac.Sum(partKey[:0])
+	return partKey
+}

cmd/crypto/key_test.go

@@ -0,0 +1,168 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"io"
+	"testing"
+
+	"github.com/minio/minio/cmd/logger"
+)
+
+var shortRandom = func(limit int64) io.Reader { return io.LimitReader(rand.Reader, limit) }
+
+func recoverTest(i int, shouldPass bool, t *testing.T) {
+	if err := recover(); err == nil && !shouldPass {
+		t.Errorf("Test %d should fail but passed successfully", i)
+	} else if err != nil && shouldPass {
+		t.Errorf("Test %d should pass but failed: %v", i, err)
+	}
+}
+
+var generateKeyTests = []struct {
+	ExtKey     [32]byte
+	Random     io.Reader
+	ShouldPass bool
+}{
+	{ExtKey: [32]byte{}, Random: nil, ShouldPass: true},              // 0
+	{ExtKey: [32]byte{}, Random: rand.Reader, ShouldPass: true},      // 1
+	{ExtKey: [32]byte{}, Random: shortRandom(32), ShouldPass: true},  // 2
+	{ExtKey: [32]byte{}, Random: shortRandom(31), ShouldPass: false}, // 3
+}
+
+func TestGenerateKey(t *testing.T) {
+	defer func(disableLog bool) { logger.Disable = disableLog }(logger.Disable)
+	logger.Disable = true
+
+	for i, test := range generateKeyTests {
+		i, test := i, test
+		func() {
+			defer recoverTest(i, test.ShouldPass, t)
+			key := GenerateKey(test.ExtKey, test.Random)
+			if [32]byte(key) == [32]byte{} {
+				t.Errorf("Test %d: generated key is zero key", i) // check that we generate random and unique key
+			}
+		}()
+	}
+}
+
+var generateIVTests = []struct {
+	Random     io.Reader
+	ShouldPass bool
+}{
+	{Random: nil, ShouldPass: true},              // 0
+	{Random: rand.Reader, ShouldPass: true},      // 1
+	{Random: shortRandom(32), ShouldPass: true},  // 2
+	{Random: shortRandom(31), ShouldPass: false}, // 3
+}
+
+func TestGenerateIV(t *testing.T) {
+	defer func(disableLog bool) { logger.Disable = disableLog }(logger.Disable)
+	logger.Disable = true
+
+	for i, test := range generateIVTests {
+		i, test := i, test
+		func() {
+			defer recoverTest(i, test.ShouldPass, t)
+			iv := GenerateIV(test.Random)
+			if iv == [32]byte{} {
+				t.Errorf("Test %d: generated IV is zero IV", i) // check that we generate random and unique IV
+			}
+		}()
+	}
+}
+
+var sealUnsealKeyTests = []struct {
+	SealExtKey, SealIV                 [32]byte
+	SealDomain, SealBucket, SealObject string
+
+	UnsealExtKey                             [32]byte
+	UnsealDomain, UnsealBucket, UnsealObject string
+
+	ShouldPass bool
+}{
+	{
+		SealExtKey: [32]byte{}, SealIV: [32]byte{}, SealDomain: "SSE-C", SealBucket: "bucket", SealObject: "object",
+		UnsealExtKey: [32]byte{}, UnsealDomain: "SSE-C", UnsealBucket: "bucket", UnsealObject: "object",
+		ShouldPass: true,
+	}, // 0
+	{
+		SealExtKey: [32]byte{}, SealIV: [32]byte{}, SealDomain: "SSE-C", SealBucket: "bucket", SealObject: "object",
+		UnsealExtKey: [32]byte{1}, UnsealDomain: "SSE-C", UnsealBucket: "bucket", UnsealObject: "object", // different ext-key
+		ShouldPass: false,
+	}, // 1
+	{
+		SealExtKey: [32]byte{}, SealIV: [32]byte{}, SealDomain: "SSE-S3", SealBucket: "bucket", SealObject: "object",
+		UnsealExtKey: [32]byte{}, UnsealDomain: "SSE-C", UnsealBucket: "bucket", UnsealObject: "object", // different domain
+		ShouldPass: false,
+	}, // 2
+	{
+		SealExtKey: [32]byte{}, SealIV: [32]byte{}, SealDomain: "SSE-C", SealBucket: "bucket", SealObject: "object",
+		UnsealExtKey: [32]byte{}, UnsealDomain: "SSE-C", UnsealBucket: "Bucket", UnsealObject: "object", // different bucket
+		ShouldPass: false,
+	}, // 3
+	{
+		SealExtKey: [32]byte{}, SealIV: [32]byte{}, SealDomain: "SSE-C", SealBucket: "bucket", SealObject: "object",
+		UnsealExtKey: [32]byte{}, UnsealDomain: "SSE-C", UnsealBucket: "bucket", UnsealObject: "Object", // different object
+		ShouldPass: false,
+	}, // 4
+}
+
+func TestSealUnsealKey(t *testing.T) {
+	for i, test := range sealUnsealKeyTests {
+		key := GenerateKey(test.SealExtKey, rand.Reader)
+		sealedKey := key.Seal(test.SealExtKey, test.SealIV, test.SealDomain, test.SealBucket, test.SealObject)
+		if err := key.Unseal(test.UnsealExtKey, sealedKey, test.UnsealDomain, test.UnsealBucket, test.UnsealObject); err == nil && !test.ShouldPass {
+			t.Errorf("Test %d should fail but passed successfully", i)
+		} else if err != nil && test.ShouldPass {
+			t.Errorf("Test %d should pass put failed: %v", i, err)
+		}
+	}
+
+	// Test legacy InsecureSealAlgorithm
+	var extKey, iv [32]byte
+	key := GenerateKey(extKey, rand.Reader)
+	sealedKey := key.Seal(extKey, iv, "SSE-S3", "bucket", "object")
+	sealedKey.Algorithm = InsecureSealAlgorithm
+	if err := key.Unseal(extKey, sealedKey, "SSE-S3", "bucket", "object"); err == nil {
+		t.Errorf("'%s' test succeeded but it should fail because the legacy algorithm was used", sealedKey.Algorithm)
+	}
+}
+
+var derivePartKeyTest = []struct {
+	PartID  uint32
+	PartKey string
+}{
+	{PartID: 0, PartKey: "aa7855e13839dd767cd5da7c1ff5036540c9264b7a803029315e55375287b4af"},
+	{PartID: 1, PartKey: "a3e7181c6eed030fd52f79537c56c4d07da92e56d374ff1dd2043350785b37d8"},
+	{PartID: 10000, PartKey: "f86e65c396ed52d204ee44bd1a0bbd86eb8b01b7354e67a3b3ae0e34dd5bd115"},
+}
+
+func TestDerivePartKey(t *testing.T) {
+	var key ObjectKey
+	for i, test := range derivePartKeyTest {
+		expectedPartKey, err := hex.DecodeString(test.PartKey)
+		if err != nil {
+			t.Fatalf("Test %d failed to decode expected part-key: %v", i, err)
+		}
+		partKey := key.DerivePartKey(test.PartID)
+		if !bytes.Equal(partKey[:], expectedPartKey[:]) {
+			t.Errorf("Test %d derives wrong part-key: got '%s' want: '%s'", i, hex.EncodeToString(partKey[:]), test.PartKey)
+		}
+	}
+}

cmd/crypto/kms.go

@@ -0,0 +1,138 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"bytes"
+	"context"
+	"crypto/hmac"
+	"crypto/rand"
+	"errors"
+	"fmt"
+	"io"
+	"sort"
+
+	"github.com/minio/minio/cmd/logger"
+	sha256 "github.com/minio/sha256-simd"
+	"github.com/minio/sio"
+)
+
+// Context is a list of key-value pairs cryptographically
+// associated with a certain object.
+type Context map[string]string
+
+// WriteTo writes the context in a canonical from to w.
+// It returns the number of bytes and the first error
+// encounter during writing to w, if any.
+//
+// WriteTo sorts the context keys and writes the sorted
+// key-value pairs as canonical JSON object to w.
+func (c Context) WriteTo(w io.Writer) (n int64, err error) {
+	sortedKeys := make(sort.StringSlice, 0, len(c))
+	for k := range c {
+		sortedKeys = append(sortedKeys, k)
+	}
+	sort.Sort(sortedKeys)
+
+	nn, err := io.WriteString(w, "{")
+	if err != nil {
+		return n + int64(nn), err
+	}
+	n += int64(nn)
+	for i, k := range sortedKeys {
+		s := fmt.Sprintf("\"%s\":\"%s\",", k, c[k])
+		if i == len(sortedKeys)-1 {
+			s = s[:len(s)-1] // remove last ','
+		}
+
+		nn, err = io.WriteString(w, s)
+		if err != nil {
+			return n + int64(nn), err
+		}
+		n += int64(nn)
+	}
+	nn, err = io.WriteString(w, "}")
+	return n + int64(nn), err
+}
+
+// KMS represents an active and authenticted connection
+// to a Key-Management-Service. It supports generating
+// data key generation and unsealing of KMS-generated
+// data keys.
+type KMS interface {
+	// GenerateKey generates a new random data key using
+	// the master key referenced by the keyID. It returns
+	// the plaintext key and the sealed plaintext key
+	// on success.
+	//
+	// The context is cryptographically bound to the
+	// generated key. The same context must be provided
+	// again to unseal the generated key.
+	GenerateKey(keyID string, context Context) (key [32]byte, sealedKey []byte, err error)
+
+	// UnsealKey unseals the sealedKey using the master key
+	// referenced by the keyID. The provided context must
+	// match the context used to generate the sealed key.
+	UnsealKey(keyID string, sealedKey []byte, context Context) (key [32]byte, err error)
+}
+
+type masterKeyKMS struct {
+	masterKey [32]byte
+}
+
+// NewKMS returns a basic KMS implementation from a single 256 bit master key.
+//
+// The KMS accepts any keyID but binds the keyID and context cryptographically
+// to the generated keys.
+func NewKMS(key [32]byte) KMS { return &masterKeyKMS{masterKey: key} }
+
+func (kms *masterKeyKMS) GenerateKey(keyID string, ctx Context) (key [32]byte, sealedKey []byte, err error) {
+	if _, err = io.ReadFull(rand.Reader, key[:]); err != nil {
+		logger.CriticalIf(context.Background(), errOutOfEntropy)
+	}
+
+	var (
+		buffer     bytes.Buffer
+		derivedKey = kms.deriveKey(keyID, ctx)
+	)
+	if n, err := sio.Encrypt(&buffer, bytes.NewReader(key[:]), sio.Config{Key: derivedKey[:]}); err != nil || n != 64 {
+		logger.CriticalIf(context.Background(), errors.New("KMS: unable to encrypt data key"))
+	}
+	sealedKey = buffer.Bytes()
+	return key, sealedKey, nil
+}
+
+func (kms *masterKeyKMS) UnsealKey(keyID string, sealedKey []byte, ctx Context) (key [32]byte, err error) {
+	var (
+		buffer     bytes.Buffer
+		derivedKey = kms.deriveKey(keyID, ctx)
+	)
+	if n, err := sio.Decrypt(&buffer, bytes.NewReader(sealedKey), sio.Config{Key: derivedKey[:]}); err != nil || n != 32 {
+		return key, err // TODO(aead): upgrade sio to use sio.Error
+	}
+	copy(key[:], buffer.Bytes())
+	return key, nil
+}
+
+func (kms *masterKeyKMS) deriveKey(keyID string, context Context) (key [32]byte) {
+	if context == nil {
+		context = Context{}
+	}
+	mac := hmac.New(sha256.New, kms.masterKey[:])
+	mac.Write([]byte(keyID))
+	context.WriteTo(mac)
+	mac.Sum(key[:0])
+	return key
+}

cmd/crypto/kms_test.go

@@ -0,0 +1,84 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"bytes"
+	"path"
+	"strings"
+	"testing"
+)
+
+var masterKeyKMSTests = []struct {
+	GenKeyID, UnsealKeyID     string
+	GenContext, UnsealContext Context
+
+	ShouldFail bool
+}{
+	{GenKeyID: "", UnsealKeyID: "", GenContext: Context{}, UnsealContext: nil, ShouldFail: false},                                                                                     // 0
+	{GenKeyID: "ac47be7f", UnsealKeyID: "ac47be7f", GenContext: Context{}, UnsealContext: Context{}, ShouldFail: false},                                                               // 1
+	{GenKeyID: "ac47be7f", UnsealKeyID: "ac47be7f", GenContext: Context{"bucket": "object"}, UnsealContext: Context{"bucket": "object"}, ShouldFail: false},                           // 2
+	{GenKeyID: "", UnsealKeyID: "", GenContext: Context{"bucket": path.Join("bucket", "object")}, UnsealContext: Context{"bucket": path.Join("bucket", "object")}, ShouldFail: false}, // 3
+	{GenKeyID: "", UnsealKeyID: "", GenContext: Context{"a": "a", "0": "0", "b": "b"}, UnsealContext: Context{"b": "b", "a": "a", "0": "0"}, ShouldFail: false},                       // 4
+
+	{GenKeyID: "ac47be7f", UnsealKeyID: "ac47be7e", GenContext: Context{}, UnsealContext: Context{}, ShouldFail: true},                                                               // 5
+	{GenKeyID: "ac47be7f", UnsealKeyID: "ac47be7f", GenContext: Context{"bucket": "object"}, UnsealContext: Context{"Bucket": "object"}, ShouldFail: true},                           // 6
+	{GenKeyID: "", UnsealKeyID: "", GenContext: Context{"bucket": path.Join("bucket", "Object")}, UnsealContext: Context{"bucket": path.Join("bucket", "object")}, ShouldFail: true}, // 7
+	{GenKeyID: "", UnsealKeyID: "", GenContext: Context{"a": "a", "0": "1", "b": "b"}, UnsealContext: Context{"b": "b", "a": "a", "0": "0"}, ShouldFail: true},                       // 8
+}
+
+func TestMasterKeyKMS(t *testing.T) {
+	kms := NewKMS([32]byte{})
+	for i, test := range masterKeyKMSTests {
+		key, sealedKey, err := kms.GenerateKey(test.GenKeyID, test.GenContext)
+		if err != nil {
+			t.Errorf("Test %d: KMS failed to generate key: %v", i, err)
+		}
+		unsealedKey, err := kms.UnsealKey(test.UnsealKeyID, sealedKey, test.UnsealContext)
+		if err != nil && !test.ShouldFail {
+			t.Errorf("Test %d: KMS failed to unseal the generated key: %v", i, err)
+		}
+		if err == nil && test.ShouldFail {
+			t.Errorf("Test %d: KMS unsealed the generated successfully but should have failed", i)
+		}
+		if !test.ShouldFail && !bytes.Equal(key[:], unsealedKey[:]) {
+			t.Errorf("Test %d: The generated and unsealed key differ", i)
+		}
+	}
+}
+
+var contextWriteToTests = []struct {
+	Context      Context
+	ExpectedJSON string
+}{
+	{Context: Context{}, ExpectedJSON: "{}"},                                                    // 0
+	{Context: Context{"a": "b"}, ExpectedJSON: `{"a":"b"}`},                                     // 1
+	{Context: Context{"a": "b", "c": "d"}, ExpectedJSON: `{"a":"b","c":"d"}`},                   // 2
+	{Context: Context{"c": "d", "a": "b"}, ExpectedJSON: `{"a":"b","c":"d"}`},                   // 3
+	{Context: Context{"0": "1", "-": "2", ".": "#"}, ExpectedJSON: `{"-":"2",".":"#","0":"1"}`}, // 4
+}
+
+func TestContextWriteTo(t *testing.T) {
+	for i, test := range contextWriteToTests {
+		var jsonContext strings.Builder
+		if _, err := test.Context.WriteTo(&jsonContext); err != nil {
+			t.Errorf("Test %d: Failed to encode context: %v", i, err)
+			continue
+		}
+		if s := jsonContext.String(); s != test.ExpectedJSON {
+			t.Errorf("Test %d: JSON representation differ - got: '%s' want: '%s'", i, s, test.ExpectedJSON)
+		}
+	}
+}

cmd/crypto/metadata.go

@@ -0,0 +1,213 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+
+	"github.com/minio/minio/cmd/logger"
+)
+
+// IsMultiPart returns true if the object metadata indicates
+// that it was uploaded using some form of server-side-encryption
+// and the S3 multipart API.
+func IsMultiPart(metadata map[string]string) bool {
+	if _, ok := metadata[SSEMultipart]; ok {
+		return true
+	}
+	return false
+}
+
+// IsEncrypted returns true if the object metadata indicates
+// that it was uploaded using some form of server-side-encryption.
+//
+// IsEncrypted only checks whether the metadata contains at least
+// one entry indicating SSE-C or SSE-S3.
+func IsEncrypted(metadata map[string]string) bool {
+	if _, ok := metadata[SSEIV]; ok {
+		return true
+	}
+	if _, ok := metadata[SSESealAlgorithm]; ok {
+		return true
+	}
+	if IsMultiPart(metadata) {
+		return true
+	}
+	if S3.IsEncrypted(metadata) {
+		return true
+	}
+	if SSEC.IsEncrypted(metadata) {
+		return true
+	}
+	return false
+}
+
+// IsEncrypted returns true if the object metadata indicates
+// that the object was uploaded using SSE-S3.
+func (s3) IsEncrypted(metadata map[string]string) bool {
+	if _, ok := metadata[S3SealedKey]; ok {
+		return true
+	}
+	if _, ok := metadata[S3KMSKeyID]; ok {
+		return true
+	}
+	if _, ok := metadata[S3KMSSealedKey]; ok {
+		return true
+	}
+	return false
+}
+
+// IsEncrypted returns true if the object metadata indicates
+// that the object was uploaded using SSE-C.
+func (ssec) IsEncrypted(metadata map[string]string) bool {
+	if _, ok := metadata[SSECSealedKey]; ok {
+		return true
+	}
+	return false
+}
+
+// CreateMultipartMetadata adds the multipart flag entry to metadata
+// and returns modifed metadata. It allocates a new metadata map if
+// metadata is nil.
+func CreateMultipartMetadata(metadata map[string]string) map[string]string {
+	if metadata == nil {
+		metadata = map[string]string{}
+	}
+	metadata[SSEMultipart] = ""
+	return metadata
+}
+
+// CreateMetadata encodes the keyID, the sealed kms data key and the sealed key
+// into the metadata and returns the modified metadata. It allocates a new
+// metadata map if metadata is nil.
+func (s3) CreateMetadata(metadata map[string]string, keyID string, kmsKey []byte, sealedKey SealedKey) map[string]string {
+	if sealedKey.Algorithm != SealAlgorithm {
+		logger.CriticalIf(context.Background(), fmt.Errorf("The seal algorithm '%s' is invalid for SSE-S3", sealedKey.Algorithm))
+	}
+
+	if metadata == nil {
+		metadata = map[string]string{}
+	}
+	metadata[S3KMSKeyID] = keyID
+	metadata[SSESealAlgorithm] = sealedKey.Algorithm
+	metadata[SSEIV] = base64.StdEncoding.EncodeToString(sealedKey.IV[:])
+	metadata[S3SealedKey] = base64.StdEncoding.EncodeToString(sealedKey.Key[:])
+	metadata[S3KMSSealedKey] = base64.StdEncoding.EncodeToString(kmsKey)
+	return metadata
+}
+
+// ParseMetadata extracts all SSE-S3 related values from the object metadata
+// and checks whether they are well-formed. It returns the KMS key-ID, the
+// sealed KMS key and the sealed object key on success.
+func (s3) ParseMetadata(metadata map[string]string) (keyID string, kmsKey []byte, sealedKey SealedKey, err error) {
+	// Extract all required values from object metadata
+	b64IV, ok := metadata[SSEIV]
+	if !ok {
+		return keyID, kmsKey, sealedKey, errMissingInternalIV
+	}
+	algorithm, ok := metadata[SSESealAlgorithm]
+	if !ok {
+		return keyID, kmsKey, sealedKey, errMissingInternalSealAlgorithm
+	}
+	b64SealedKey, ok := metadata[S3SealedKey]
+	if !ok {
+		return keyID, kmsKey, sealedKey, Error{"The object metadata is missing the internal sealed key for SSE-S3"}
+	}
+	keyID, ok = metadata[S3KMSKeyID]
+	if !ok {
+		return keyID, kmsKey, sealedKey, Error{"The object metadata is missing the internal KMS key-ID for SSE-S3"}
+	}
+	b64KMSSealedKey, ok := metadata[S3KMSSealedKey]
+	if !ok {
+		return keyID, kmsKey, sealedKey, Error{"The object metadata is missing the internal sealed KMS data key for SSE-S3"}
+	}
+
+	// Check whether all extracted values are well-formed
+	iv, err := base64.StdEncoding.DecodeString(b64IV)
+	if err != nil || len(iv) != 32 {
+		return keyID, kmsKey, sealedKey, errInvalidInternalIV
+	}
+	if algorithm != SealAlgorithm {
+		return keyID, kmsKey, sealedKey, errInvalidInternalSealAlgorithm
+	}
+	encryptedKey, err := base64.StdEncoding.DecodeString(b64SealedKey)
+	if err != nil || len(encryptedKey) != 64 {
+		return keyID, kmsKey, sealedKey, Error{"The internal sealed key for SSE-S3 is invalid"}
+	}
+	kmsKey, err = base64.StdEncoding.DecodeString(b64KMSSealedKey)
+	if err != nil {
+		return keyID, kmsKey, sealedKey, Error{"The internal sealed KMS data key for SSE-S3 is invalid"}
+	}
+
+	sealedKey.Algorithm = algorithm
+	copy(sealedKey.IV[:], iv)
+	copy(sealedKey.Key[:], encryptedKey)
+	return keyID, kmsKey, sealedKey, nil
+}
+
+// CreateMetadata encodes the sealed key into the metadata and returns the modified metadata.
+// It allocates a new metadata map if metadata is nil.
+func (ssec) CreateMetadata(metadata map[string]string, sealedKey SealedKey) map[string]string {
+	if sealedKey.Algorithm != SealAlgorithm {
+		logger.CriticalIf(context.Background(), fmt.Errorf("The seal algorithm '%s' is invalid for SSE-C", sealedKey.Algorithm))
+	}
+
+	if metadata == nil {
+		metadata = map[string]string{}
+	}
+	metadata[SSESealAlgorithm] = SealAlgorithm
+	metadata[SSEIV] = base64.StdEncoding.EncodeToString(sealedKey.IV[:])
+	metadata[SSECSealedKey] = base64.StdEncoding.EncodeToString(sealedKey.Key[:])
+	return metadata
+}
+
+// ParseMetadata extracts all SSE-C related values from the object metadata
+// and checks whether they are well-formed. It returns the sealed object key
+// on success.
+func (ssec) ParseMetadata(metadata map[string]string) (sealedKey SealedKey, err error) {
+	// Extract all required values from object metadata
+	b64IV, ok := metadata[SSEIV]
+	if !ok {
+		return sealedKey, errMissingInternalIV
+	}
+	algorithm, ok := metadata[SSESealAlgorithm]
+	if !ok {
+		return sealedKey, errMissingInternalSealAlgorithm
+	}
+	b64SealedKey, ok := metadata[SSECSealedKey]
+	if !ok {
+		return sealedKey, Error{"The object metadata is missing the internal sealed key for SSE-C"}
+	}
+
+	// Check whether all extracted values are well-formed
+	iv, err := base64.StdEncoding.DecodeString(b64IV)
+	if err != nil || len(iv) != 32 {
+		return sealedKey, errInvalidInternalIV
+	}
+	if algorithm != SealAlgorithm && algorithm != InsecureSealAlgorithm {
+		return sealedKey, errInvalidInternalSealAlgorithm
+	}
+	encryptedKey, err := base64.StdEncoding.DecodeString(b64SealedKey)
+	if err != nil || len(encryptedKey) != 64 {
+		return sealedKey, Error{"The internal sealed key for SSE-C is invalid"}
+	}
+
+	sealedKey.Algorithm = algorithm
+	copy(sealedKey.IV[:], iv)
+	copy(sealedKey.Key[:], encryptedKey)
+	return sealedKey, nil
+}

cmd/crypto/metadata_test.go

@@ -0,0 +1,361 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"bytes"
+	"encoding/base64"
+	"testing"
+
+	"github.com/minio/minio/cmd/logger"
+)
+
+var isMultipartTests = []struct {
+	Metadata  map[string]string
+	Multipart bool
+}{
+	{Multipart: true, Metadata: map[string]string{SSEMultipart: ""}},                           // 0
+	{Multipart: true, Metadata: map[string]string{"X-Minio-Internal-Encrypted-Multipart": ""}}, // 1
+	{Multipart: true, Metadata: map[string]string{SSEMultipart: "some-value"}},                 // 2
+	{Multipart: false, Metadata: map[string]string{"": ""}},                                    // 3
+	{Multipart: false, Metadata: map[string]string{"X-Minio-Internal-EncryptedMultipart": ""}}, // 4
+}
+
+func TestIsMultipart(t *testing.T) {
+	for i, test := range isMultipartTests {
+		if isMultipart := IsMultiPart(test.Metadata); isMultipart != test.Multipart {
+			t.Errorf("Test %d: got '%v' - want '%v'", i, isMultipart, test.Multipart)
+		}
+	}
+}
+
+var isEncryptedTests = []struct {
+	Metadata  map[string]string
+	Encrypted bool
+}{
+	{Encrypted: true, Metadata: map[string]string{SSEMultipart: ""}},                               // 0
+	{Encrypted: true, Metadata: map[string]string{SSEIV: ""}},                                      // 1
+	{Encrypted: true, Metadata: map[string]string{SSESealAlgorithm: ""}},                           // 2
+	{Encrypted: true, Metadata: map[string]string{SSECSealedKey: ""}},                              // 3
+	{Encrypted: true, Metadata: map[string]string{S3SealedKey: ""}},                                // 4
+	{Encrypted: true, Metadata: map[string]string{S3KMSKeyID: ""}},                                 // 5
+	{Encrypted: true, Metadata: map[string]string{S3KMSSealedKey: ""}},                             // 6
+	{Encrypted: false, Metadata: map[string]string{"": ""}},                                        // 7
+	{Encrypted: false, Metadata: map[string]string{"X-Minio-Internal-Server-Side-Encryption": ""}}, // 8
+}
+
+func TestIsEncrypted(t *testing.T) {
+	for i, test := range isEncryptedTests {
+		if isEncrypted := IsEncrypted(test.Metadata); isEncrypted != test.Encrypted {
+			t.Errorf("Test %d: got '%v' - want '%v'", i, isEncrypted, test.Encrypted)
+		}
+	}
+}
+
+var s3IsEncryptedTests = []struct {
+	Metadata  map[string]string
+	Encrypted bool
+}{
+	{Encrypted: false, Metadata: map[string]string{SSEMultipart: ""}},                              // 0
+	{Encrypted: false, Metadata: map[string]string{SSEIV: ""}},                                     // 1
+	{Encrypted: false, Metadata: map[string]string{SSESealAlgorithm: ""}},                          // 2
+	{Encrypted: false, Metadata: map[string]string{SSECSealedKey: ""}},                             // 3
+	{Encrypted: true, Metadata: map[string]string{S3SealedKey: ""}},                                // 4
+	{Encrypted: true, Metadata: map[string]string{S3KMSKeyID: ""}},                                 // 5
+	{Encrypted: true, Metadata: map[string]string{S3KMSSealedKey: ""}},                             // 6
+	{Encrypted: false, Metadata: map[string]string{"": ""}},                                        // 7
+	{Encrypted: false, Metadata: map[string]string{"X-Minio-Internal-Server-Side-Encryption": ""}}, // 8
+}
+
+func TestS3IsEncrypted(t *testing.T) {
+	for i, test := range s3IsEncryptedTests {
+		if isEncrypted := S3.IsEncrypted(test.Metadata); isEncrypted != test.Encrypted {
+			t.Errorf("Test %d: got '%v' - want '%v'", i, isEncrypted, test.Encrypted)
+		}
+	}
+}
+
+var ssecIsEncryptedTests = []struct {
+	Metadata  map[string]string
+	Encrypted bool
+}{
+	{Encrypted: false, Metadata: map[string]string{SSEMultipart: ""}},                              // 0
+	{Encrypted: false, Metadata: map[string]string{SSEIV: ""}},                                     // 1
+	{Encrypted: false, Metadata: map[string]string{SSESealAlgorithm: ""}},                          // 2
+	{Encrypted: true, Metadata: map[string]string{SSECSealedKey: ""}},                              // 3
+	{Encrypted: false, Metadata: map[string]string{S3SealedKey: ""}},                               // 4
+	{Encrypted: false, Metadata: map[string]string{S3KMSKeyID: ""}},                                // 5
+	{Encrypted: false, Metadata: map[string]string{S3KMSSealedKey: ""}},                            // 6
+	{Encrypted: false, Metadata: map[string]string{"": ""}},                                        // 7
+	{Encrypted: false, Metadata: map[string]string{"X-Minio-Internal-Server-Side-Encryption": ""}}, // 8
+}
+
+func TestSSECIsEncrypted(t *testing.T) {
+	for i, test := range ssecIsEncryptedTests {
+		if isEncrypted := SSEC.IsEncrypted(test.Metadata); isEncrypted != test.Encrypted {
+			t.Errorf("Test %d: got '%v' - want '%v'", i, isEncrypted, test.Encrypted)
+		}
+	}
+}
+
+var s3ParseMetadataTests = []struct {
+	Metadata    map[string]string
+	ExpectedErr error
+
+	DataKey   []byte
+	KeyID     string
+	SealedKey SealedKey
+}{
+	{ExpectedErr: errMissingInternalIV, Metadata: map[string]string{}, DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{}}, // 0
+	{
+		ExpectedErr: errMissingInternalSealAlgorithm, Metadata: map[string]string{SSEIV: ""},
+		DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
+	}, // 1
+	{
+		ExpectedErr: Error{"The object metadata is missing the internal sealed key for SSE-S3"},
+		Metadata:    map[string]string{SSEIV: "", SSESealAlgorithm: ""}, DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
+	}, // 2
+	{
+		ExpectedErr: Error{"The object metadata is missing the internal KMS key-ID for SSE-S3"},
+		Metadata:    map[string]string{SSEIV: "", SSESealAlgorithm: "", S3SealedKey: ""}, DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
+	}, // 3
+	{
+		ExpectedErr: Error{"The object metadata is missing the internal sealed KMS data key for SSE-S3"},
+		Metadata:    map[string]string{SSEIV: "", SSESealAlgorithm: "", S3SealedKey: "", S3KMSKeyID: ""},
+		DataKey:     []byte{}, KeyID: "", SealedKey: SealedKey{},
+	}, // 4
+	{
+		ExpectedErr: errInvalidInternalIV,
+		Metadata:    map[string]string{SSEIV: "", SSESealAlgorithm: "", S3SealedKey: "", S3KMSKeyID: "", S3KMSSealedKey: ""},
+		DataKey:     []byte{}, KeyID: "", SealedKey: SealedKey{},
+	}, // 5
+	{
+		ExpectedErr: errInvalidInternalSealAlgorithm,
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: "", S3SealedKey: "", S3KMSKeyID: "", S3KMSSealedKey: "",
+		},
+		DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
+	}, // 6
+	{
+		ExpectedErr: Error{"The internal sealed key for SSE-S3 is invalid"},
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm, S3SealedKey: "",
+			S3KMSKeyID: "", S3KMSSealedKey: "",
+		},
+		DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{},
+	}, // 7
+	{
+		ExpectedErr: Error{"The internal sealed KMS data key for SSE-S3 is invalid"},
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm,
+			S3SealedKey: base64.StdEncoding.EncodeToString(make([]byte, 64)), S3KMSKeyID: "key-1",
+			S3KMSSealedKey: ".MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=", // invalid base64
+		},
+		DataKey: []byte{}, KeyID: "key-1", SealedKey: SealedKey{},
+	}, // 8
+	{
+		ExpectedErr: nil,
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm,
+			S3SealedKey: base64.StdEncoding.EncodeToString(make([]byte, 64)), S3KMSKeyID: "", S3KMSSealedKey: "",
+		},
+		DataKey: []byte{}, KeyID: "", SealedKey: SealedKey{Algorithm: SealAlgorithm},
+	}, // 9
+	{
+		ExpectedErr: nil,
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 31)...)), SSESealAlgorithm: SealAlgorithm,
+			S3SealedKey: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 63)...)), S3KMSKeyID: "key-1",
+			S3KMSSealedKey: base64.StdEncoding.EncodeToString(make([]byte, 48)),
+		},
+		DataKey: make([]byte, 48), KeyID: "key-1", SealedKey: SealedKey{Algorithm: SealAlgorithm, Key: [64]byte{1}, IV: [32]byte{1}},
+	}, // 10
+}
+
+func TestS3ParseMetadata(t *testing.T) {
+	for i, test := range s3ParseMetadataTests {
+		keyID, dataKey, sealedKey, err := S3.ParseMetadata(test.Metadata)
+		if err != test.ExpectedErr {
+			t.Errorf("Test %d: got error '%v' - want error '%v'", i, err, test.ExpectedErr)
+		}
+		if !bytes.Equal(dataKey, test.DataKey) {
+			t.Errorf("Test %d: got data key '%v' - want data key '%v'", i, dataKey, test.DataKey)
+		}
+		if keyID != test.KeyID {
+			t.Errorf("Test %d: got key-ID '%v' - want key-ID '%v'", i, keyID, test.KeyID)
+		}
+		if sealedKey.Algorithm != test.SealedKey.Algorithm {
+			t.Errorf("Test %d: got sealed key algorithm '%v' - want sealed key algorithm '%v'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
+		}
+		if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
+			t.Errorf("Test %d: got sealed key '%v' - want sealed key '%v'", i, sealedKey.Key, test.SealedKey.Key)
+		}
+		if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
+			t.Errorf("Test %d: got sealed key IV '%v' - want sealed key IV '%v'", i, sealedKey.IV, test.SealedKey.IV)
+		}
+	}
+}
+
+var ssecParseMetadataTests = []struct {
+	Metadata    map[string]string
+	ExpectedErr error
+
+	SealedKey SealedKey
+}{
+	{ExpectedErr: errMissingInternalIV, Metadata: map[string]string{}, SealedKey: SealedKey{}},                     // 0
+	{ExpectedErr: errMissingInternalSealAlgorithm, Metadata: map[string]string{SSEIV: ""}, SealedKey: SealedKey{}}, // 1
+	{
+		ExpectedErr: Error{"The object metadata is missing the internal sealed key for SSE-C"},
+		Metadata:    map[string]string{SSEIV: "", SSESealAlgorithm: ""}, SealedKey: SealedKey{},
+	}, // 2
+	{
+		ExpectedErr: errInvalidInternalIV,
+		Metadata:    map[string]string{SSEIV: "", SSESealAlgorithm: "", SSECSealedKey: ""}, SealedKey: SealedKey{},
+	}, // 3
+	{
+		ExpectedErr: errInvalidInternalSealAlgorithm,
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: "", SSECSealedKey: "",
+		},
+		SealedKey: SealedKey{},
+	}, // 4
+	{
+		ExpectedErr: Error{"The internal sealed key for SSE-C is invalid"},
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm, SSECSealedKey: "",
+		},
+		SealedKey: SealedKey{},
+	}, // 5
+	{
+		ExpectedErr: nil,
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(make([]byte, 32)), SSESealAlgorithm: SealAlgorithm,
+			SSECSealedKey: base64.StdEncoding.EncodeToString(make([]byte, 64)),
+		},
+		SealedKey: SealedKey{Algorithm: SealAlgorithm},
+	}, // 6
+	{
+		ExpectedErr: nil,
+		Metadata: map[string]string{
+			SSEIV: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 31)...)), SSESealAlgorithm: InsecureSealAlgorithm,
+			SSECSealedKey: base64.StdEncoding.EncodeToString(append([]byte{1}, make([]byte, 63)...)),
+		},
+		SealedKey: SealedKey{Algorithm: InsecureSealAlgorithm, Key: [64]byte{1}, IV: [32]byte{1}},
+	}, // 7
+}
+
+func TestCreateMultipartMetadata(t *testing.T) {
+	metadata := CreateMultipartMetadata(nil)
+	if v, ok := metadata[SSEMultipart]; !ok || v != "" {
+		t.Errorf("Metadata is missing the correct value for '%s': got '%s' - want '%s'", SSEMultipart, v, "")
+	}
+}
+
+func TestSSECParseMetadata(t *testing.T) {
+	for i, test := range ssecParseMetadataTests {
+		sealedKey, err := SSEC.ParseMetadata(test.Metadata)
+		if err != test.ExpectedErr {
+			t.Errorf("Test %d: got error '%v' - want error '%v'", i, err, test.ExpectedErr)
+		}
+		if sealedKey.Algorithm != test.SealedKey.Algorithm {
+			t.Errorf("Test %d: got sealed key algorithm '%v' - want sealed key algorithm '%v'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
+		}
+		if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
+			t.Errorf("Test %d: got sealed key '%v' - want sealed key '%v'", i, sealedKey.Key, test.SealedKey.Key)
+		}
+		if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
+			t.Errorf("Test %d: got sealed key IV '%v' - want sealed key IV '%v'", i, sealedKey.IV, test.SealedKey.IV)
+		}
+	}
+}
+
+var s3CreateMetadataTests = []struct {
+	KeyID         string
+	SealedDataKey []byte
+	SealedKey     SealedKey
+}{
+	{KeyID: "", SealedDataKey: make([]byte, 48), SealedKey: SealedKey{Algorithm: SealAlgorithm}},
+	{KeyID: "cafebabe", SealedDataKey: make([]byte, 48), SealedKey: SealedKey{Algorithm: SealAlgorithm}},
+	{KeyID: "deadbeef", SealedDataKey: make([]byte, 32), SealedKey: SealedKey{IV: [32]byte{0xf7}, Key: [64]byte{0xea}, Algorithm: SealAlgorithm}},
+}
+
+func TestS3CreateMetadata(t *testing.T) {
+	defer func(disableLog bool) { logger.Disable = disableLog }(logger.Disable)
+	logger.Disable = true
+	for i, test := range s3CreateMetadataTests {
+		metadata := S3.CreateMetadata(nil, test.KeyID, test.SealedDataKey, test.SealedKey)
+		keyID, kmsKey, sealedKey, err := S3.ParseMetadata(metadata)
+		if err != nil {
+			t.Errorf("Test %d: failed to parse metadata: %v", i, err)
+			continue
+		}
+		if keyID != test.KeyID {
+			t.Errorf("Test %d: Key-ID mismatch: got '%s' - want '%s'", i, keyID, test.KeyID)
+		}
+		if !bytes.Equal(kmsKey, test.SealedDataKey) {
+			t.Errorf("Test %d: sealed KMS data mismatch: got '%v' - want '%v'", i, kmsKey, test.SealedDataKey)
+		}
+		if sealedKey.Algorithm != test.SealedKey.Algorithm {
+			t.Errorf("Test %d: seal algorithm mismatch: got '%s' - want '%s'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
+		}
+		if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
+			t.Errorf("Test %d: IV mismatch: got '%v' - want '%v'", i, sealedKey.IV, test.SealedKey.IV)
+		}
+		if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
+			t.Errorf("Test %d: sealed key mismatch: got '%v' - want '%v'", i, sealedKey.Key, test.SealedKey.Key)
+		}
+	}
+
+	defer func() {
+		if err := recover(); err == nil || err != logger.ErrCritical {
+			t.Errorf("Expected '%s' panic for invalid seal algorithm but got '%s'", logger.ErrCritical, err)
+		}
+	}()
+	_ = S3.CreateMetadata(nil, "", []byte{}, SealedKey{Algorithm: InsecureSealAlgorithm})
+}
+
+var ssecCreateMetadataTests = []SealedKey{
+	{Algorithm: SealAlgorithm},
+	{IV: [32]byte{0xff}, Key: [64]byte{0x7e}, Algorithm: SealAlgorithm},
+}
+
+func TestSSECCreateMetadata(t *testing.T) {
+	defer func(disableLog bool) { logger.Disable = disableLog }(logger.Disable)
+	logger.Disable = true
+	for i, test := range s3CreateMetadataTests {
+		metadata := SSEC.CreateMetadata(nil, test.SealedKey)
+		sealedKey, err := SSEC.ParseMetadata(metadata)
+		if err != nil {
+			t.Errorf("Test %d: failed to parse metadata: %v", i, err)
+			continue
+		}
+		if sealedKey.Algorithm != test.SealedKey.Algorithm {
+			t.Errorf("Test %d: seal algorithm mismatch: got '%s' - want '%s'", i, sealedKey.Algorithm, test.SealedKey.Algorithm)
+		}
+		if !bytes.Equal(sealedKey.IV[:], test.SealedKey.IV[:]) {
+			t.Errorf("Test %d: IV mismatch: got '%v' - want '%v'", i, sealedKey.IV, test.SealedKey.IV)
+		}
+		if !bytes.Equal(sealedKey.Key[:], test.SealedKey.Key[:]) {
+			t.Errorf("Test %d: sealed key mismatch: got '%v' - want '%v'", i, sealedKey.Key, test.SealedKey.Key)
+		}
+	}
+
+	defer func() {
+		if err := recover(); err == nil || err != logger.ErrCritical {
+			t.Errorf("Expected '%s' panic for invalid seal algorithm but got '%s'", logger.ErrCritical, err)
+		}
+	}()
+	_ = SSEC.CreateMetadata(nil, SealedKey{Algorithm: InsecureSealAlgorithm})
+}

cmd/crypto/sse.go

@@ -0,0 +1,106 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"context"
+	"errors"
+	"io"
+
+	"github.com/minio/minio/cmd/logger"
+	"github.com/minio/minio/pkg/ioutil"
+	"github.com/minio/sio"
+)
+
+const (
+	// SSEMultipart is the metadata key indicating that the object
+	// was uploaded using the S3 multipart API and stored using
+	// some from of server-side-encryption.
+	SSEMultipart = "X-Minio-Internal-Encrypted-Multipart"
+
+	// SSEIV is the metadata key referencing the random initialization
+	// vector (IV) used for SSE-S3 and SSE-C key derivation.
+	SSEIV = "X-Minio-Internal-Server-Side-Encryption-Iv"
+
+	// SSESealAlgorithm is the metadata key referencing the algorithm
+	// used by SSE-C and SSE-S3 to encrypt the object.
+	SSESealAlgorithm = "X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm"
+
+	// SSECSealedKey is the metadata key referencing the sealed object-key for SSE-C.
+	SSECSealedKey = "X-Minio-Internal-Server-Side-Encryption-Sealed-Key"
+
+	// S3SealedKey is the metadata key referencing the sealed object-key for SSE-S3.
+	S3SealedKey = "X-Minio-Internal-Server-Side-Encryption-S3-Sealed-Key"
+
+	// S3KMSKeyID is the metadata key referencing the KMS key-id used to
+	// generate/decrypt the S3-KMS-Sealed-Key. It is only used for SSE-S3 + KMS.
+	S3KMSKeyID = "X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id"
+
+	// S3KMSSealedKey is the metadata key referencing the encrypted key generated
+	// by KMS. It is only used for SSE-S3 + KMS.
+	S3KMSSealedKey = "X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key"
+)
+
+const (
+	// SealAlgorithm is the encryption/sealing algorithm used to derive & seal
+	// the key-encryption-key and to en/decrypt the object data.
+	SealAlgorithm = "DAREv2-HMAC-SHA256"
+
+	// InsecureSealAlgorithm is the legacy encryption/sealing algorithm used
+	// to derive & seal the key-encryption-key and to en/decrypt the object data.
+	// This algorithm should not be used for new objects because its key derivation
+	// is not optimal. See: https://github.com/minio/minio/pull/6121
+	InsecureSealAlgorithm = "DARE-SHA256"
+)
+
+// String returns the SSE domain as string. For SSE-S3 the
+// domain is "SSE-S3".
+func (s3) String() string { return "SSE-S3" }
+
+// String returns the SSE domain as string. For SSE-C the
+// domain is "SSE-C".
+func (ssec) String() string { return "SSE-C" }
+
+// EncryptSinglePart encrypts an io.Reader which must be the
+// the body of a single-part PUT request.
+func EncryptSinglePart(r io.Reader, key ObjectKey) io.Reader {
+	r, err := sio.EncryptReader(r, sio.Config{MinVersion: sio.Version20, Key: key[:]})
+	if err != nil {
+		logger.CriticalIf(context.Background(), errors.New("Unable to encrypt io.Reader using object key"))
+	}
+	return r
+}
+
+// EncryptMultiPart encrypts an io.Reader which must be the body of
+// multi-part PUT request. It derives an unique encryption key from
+// the partID and the object key.
+func EncryptMultiPart(r io.Reader, partID int, key ObjectKey) io.Reader {
+	partKey := key.DerivePartKey(uint32(partID))
+	return EncryptSinglePart(r, ObjectKey(partKey))
+}
+
+// DecryptSinglePart decrypts an io.Writer which must an object
+// uploaded with the single-part PUT API. The offset and length
+// specify the requested range.
+func DecryptSinglePart(w io.Writer, offset, length int64, key ObjectKey) io.WriteCloser {
+	const PayloadSize = 1 << 16 // DARE 2.0
+	w = ioutil.LimitedWriter(w, offset%PayloadSize, length)
+
+	decWriter, err := sio.DecryptWriter(w, sio.Config{Key: key[:]})
+	if err != nil {
+		logger.CriticalIf(context.Background(), errors.New("Unable to decrypt io.Writer using object key"))
+	}
+	return decWriter
+}

cmd/crypto/sse_test.go

@@ -0,0 +1,31 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import "testing"
+
+func TestS3String(t *testing.T) {
+	const Domain = "SSE-S3"
+	if domain := S3.String(); domain != Domain {
+		t.Errorf("S3's string method returns wrong domain: got '%s' - want '%s'", domain, Domain)
+	}
+}
+
+func TestSSECString(t *testing.T) {
+	const Domain = "SSE-C"
+	if domain := SSEC.String(); domain != Domain {
+		t.Errorf("SSEC's string method returns wrong domain: got '%s' - want '%s'", domain, Domain)
+	}
+}

cmd/crypto/vault.go

@@ -0,0 +1,256 @@
+// Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 Minio, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package crypto
+
+import (
+	"bytes"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	vault "github.com/hashicorp/vault/api"
+)
+
+const (
+	// VaultEndpointEnv Vault endpoint environment variable
+	VaultEndpointEnv = "MINIO_SSE_VAULT_ENDPOINT"
+	// vaultAuthTypeEnv type of vault auth to be used
+	vaultAuthTypeEnv = "MINIO_SSE_VAULT_AUTH_TYPE"
+	// vaultAppRoleIDEnv  Vault AppRole ID environment variable
+	vaultAppRoleIDEnv = "MINIO_SSE_VAULT_APPROLE_ID"
+	// vaultAppSecretIDEnv Vault AppRole Secret environment variable
+	vaultAppSecretIDEnv = "MINIO_SSE_VAULT_APPROLE_SECRET"
+	// vaultKeyVersionEnv Vault Key Version environment variable
+	vaultKeyVersionEnv = "MINIO_SSE_VAULT_KEY_VERSION"
+	// vaultKeyNameEnv Vault Encryption Key Name environment variable
+	vaultKeyNameEnv = "MINIO_SSE_VAULT_KEY_NAME"
+)
+
+var (
+	//ErrKMSAuthLogin is raised when there is a failure authenticating to KMS
+	ErrKMSAuthLogin = errors.New("Vault service did not return auth info")
+)
+
+type vaultService struct {
+	config        *VaultConfig
+	client        *vault.Client
+	leaseDuration time.Duration
+}
+
+// return transit secret engine's path for generate data key operation
+func (v *vaultService) genDataKeyEndpoint(key string) string {
+	return "/transit/datakey/plaintext/" + key
+}
+
+// return transit secret engine's path for decrypt operation
+func (v *vaultService) decryptEndpoint(key string) string {
+	return "/transit/decrypt/" + key
+}
+
+// VaultKey represents vault encryption key-id name & version
+type VaultKey struct {
+	Name    string `json:"name"`
+	Version int    `json:"version"`
+}
+
+// VaultAuth represents vault auth type to use. For now, AppRole is the only supported
+// auth type.
+type VaultAuth struct {
+	Type    string       `json:"type"`
+	AppRole VaultAppRole `json:"approle"`
+}
+
+// VaultAppRole represents vault approle credentials
+type VaultAppRole struct {
+	ID     string `json:"id"`
+	Secret string `json:"secret"`
+}
+
+// VaultConfig holds config required to start vault service
+type VaultConfig struct {
+	Endpoint string    `json:"endpoint"`
+	Auth     VaultAuth `json:"auth"`
+	Key      VaultKey  `json:"key-id"`
+}
+
+// validate whether all required env variables needed to start vault service have
+// been set
+func validateVaultConfig(c *VaultConfig) error {
+	if c.Endpoint == "" {
+		return fmt.Errorf("Missing hashicorp vault endpoint - %s is empty", VaultEndpointEnv)
+	}
+	if strings.ToLower(c.Auth.Type) != "approle" {
+		return fmt.Errorf("Unsupported hashicorp vault auth type - %s", vaultAuthTypeEnv)
+	}
+	if c.Auth.AppRole.ID == "" {
+		return fmt.Errorf("Missing hashicorp vault AppRole ID - %s is empty", vaultAppRoleIDEnv)
+	}
+	if c.Auth.AppRole.Secret == "" {
+		return fmt.Errorf("Missing hashicorp vault AppSecret ID - %s is empty", vaultAppSecretIDEnv)
+	}
+	if c.Key.Name == "" {
+		return fmt.Errorf("Invalid value set in environment variable %s", vaultKeyNameEnv)
+	}
+	if c.Key.Version < 0 {
+		return fmt.Errorf("Invalid value set in environment variable %s", vaultKeyVersionEnv)
+	}
+
+	return nil
+}
+
+// authenticate to vault with app role id and app role secret, and get a client access token, lease duration
+func getVaultAccessToken(client *vault.Client, appRoleID, appSecret string) (token string, duration int, err error) {
+	data := map[string]interface{}{
+		"role_id":   appRoleID,
+		"secret_id": appSecret,
+	}
+	resp, e := client.Logical().Write("auth/approle/login", data)
+	if e != nil {
+		return token, duration, e
+	}
+	if resp.Auth == nil {
+		return token, duration, ErrKMSAuthLogin
+	}
+	return resp.Auth.ClientToken, resp.Auth.LeaseDuration, nil
+}
+
+// NewVaultConfig sets KMSConfig from environment
+// variables and performs validations.
+func NewVaultConfig() (KMSConfig, error) {
+	kc := KMSConfig{}
+	endpoint := os.Getenv(VaultEndpointEnv)
+	roleID := os.Getenv(vaultAppRoleIDEnv)
+	roleSecret := os.Getenv(vaultAppSecretIDEnv)
+	keyName := os.Getenv(vaultKeyNameEnv)
+	keyVersion := 0
+	authType := "approle"
+	if versionStr := os.Getenv(vaultKeyVersionEnv); versionStr != "" {
+		version, err := strconv.Atoi(versionStr)
+		if err != nil {
+			return kc, fmt.Errorf("Unable to parse %s value (`%s`)", vaultKeyVersionEnv, versionStr)
+		}
+		keyVersion = version
+	}
+	// return if none of the vault env variables are configured
+	if (endpoint == "") && (roleID == "") && (roleSecret == "") && (keyName == "") && (keyVersion == 0) {
+		return kc, nil
+	}
+	c := VaultConfig{
+		Endpoint: endpoint,
+		Auth: VaultAuth{
+			Type: authType,
+			AppRole: VaultAppRole{
+				ID:     roleID,
+				Secret: roleSecret,
+			},
+		},
+		Key: VaultKey{
+			Version: keyVersion,
+			Name:    keyName,
+		},
+	}
+	if err := validateVaultConfig(&c); err != nil {
+		return kc, err
+	}
+	kc.Vault = c
+	return kc, nil
+}
+
+// NewVault initializes Hashicorp Vault KMS by
+// authenticating to Vault with the credentials in KMSConfig,
+// and gets a client token for future api calls.
+func NewVault(kmsConf KMSConfig) (KMS, error) {
+	config := kmsConf.Vault
+	c, err := vault.NewClient(&vault.Config{
+		Address: config.Endpoint,
+	})
+	if err != nil {
+		return nil, err
+	}
+	accessToken, leaseDuration, err := getVaultAccessToken(c, config.Auth.AppRole.ID, config.Auth.AppRole.Secret)
+	if err != nil {
+		return nil, err
+	}
+	// authenticate and get the access token
+	c.SetToken(accessToken)
+	v := vaultService{client: c, config: &config, leaseDuration: time.Duration(leaseDuration)}
+	v.renewToken(c)
+	return &v, nil
+}
+
+func (v *vaultService) renewToken(c *vault.Client) {
+	retryDelay := 1 * time.Minute
+	go func() {
+		for {
+			s, err := c.Auth().Token().RenewSelf(int(v.leaseDuration))
+			if err != nil {
+				time.Sleep(retryDelay)
+				continue
+			}
+			nextRenew := s.Auth.LeaseDuration / 2
+			time.Sleep(time.Duration(nextRenew) * time.Second)
+		}
+	}()
+}
+
+// Generates a random plain text key, sealed plain text key from
+// Vault. It returns the plaintext key and sealed plaintext key on success
+func (v *vaultService) GenerateKey(keyID string, ctx Context) (key [32]byte, sealedKey []byte, err error) {
+	contextStream := new(bytes.Buffer)
+	ctx.WriteTo(contextStream)
+
+	payload := map[string]interface{}{
+		"context": base64.StdEncoding.EncodeToString(contextStream.Bytes()),
+	}
+	s, err1 := v.client.Logical().Write(v.genDataKeyEndpoint(keyID), payload)
+
+	if err1 != nil {
+		return key, sealedKey, err1
+	}
+	sealKey := s.Data["ciphertext"].(string)
+	plainKey, err := base64.StdEncoding.DecodeString(s.Data["plaintext"].(string))
+	if err != nil {
+		return key, sealedKey, err1
+	}
+	copy(key[:], []byte(plainKey))
+	return key, []byte(sealKey), nil
+}
+
+// unsealKMSKey unseals the sealedKey using the Vault master key
+// referenced by the keyID. The plain text key is returned on success.
+func (v *vaultService) UnsealKey(keyID string, sealedKey []byte, ctx Context) (key [32]byte, err error) {
+	contextStream := new(bytes.Buffer)
+	ctx.WriteTo(contextStream)
+	payload := map[string]interface{}{
+		"ciphertext": string(sealedKey),
+		"context":    base64.StdEncoding.EncodeToString(contextStream.Bytes()),
+	}
+	s, err1 := v.client.Logical().Write(v.decryptEndpoint(keyID), payload)
+	if err1 != nil {
+		return key, err1
+	}
+	base64Key := s.Data["plaintext"].(string)
+	plainKey, err1 := base64.StdEncoding.DecodeString(base64Key)
+	if err1 != nil {
+		return key, err1
+	}
+	copy(key[:], []byte(plainKey))
+
+	return key, nil
+}

cmd/disk-cache-config.go

@@ -18,13 +18,18 @@ package cmd
 
 import (
 	"encoding/json"
+	"errors"
 	"path/filepath"
+	"strings"
+
+	"github.com/minio/minio/pkg/ellipses"
 )
 
 // CacheConfig represents cache config settings
 type CacheConfig struct {
 	Drives  []string `json:"drives"`
 	Expiry  int      `json:"expiry"`
+	MaxUse  int      `json:"maxuse"`
 	Exclude []string `json:"exclude"`
 }
 
@@ -40,6 +45,15 @@ func (cfg *CacheConfig) UnmarshalJSON(data []byte) (err error) {
 	if err = json.Unmarshal(data, _cfg); err != nil {
 		return err
 	}
+
+	if _cfg.Expiry < 0 {
+		return errors.New("config expiry value should not be negative")
+	}
+
+	if _cfg.MaxUse < 0 {
+		return errors.New("config max use value should not be null or negative")
+	}
+
 	if _, err = parseCacheDrives(_cfg.Drives); err != nil {
 		return err
 	}
@@ -51,12 +65,42 @@ func (cfg *CacheConfig) UnmarshalJSON(data []byte) (err error) {
 
 // Parses given cacheDrivesEnv and returns a list of cache drives.
 func parseCacheDrives(drives []string) ([]string, error) {
+	if len(drives) == 0 {
+		return drives, nil
+	}
+	var endpoints []string
 	for _, d := range drives {
+		if ellipses.HasEllipses(d) {
+			s, err := parseCacheDrivePaths(d)
+			if err != nil {
+				return nil, err
+			}
+			endpoints = append(endpoints, s...)
+		} else {
+			endpoints = append(endpoints, d)
+		}
+	}
+
+	for _, d := range endpoints {
 		if !filepath.IsAbs(d) {
 			return nil, uiErrInvalidCacheDrivesValue(nil).Msg("cache dir should be absolute path: %s", d)
 		}
 	}
-	return drives, nil
+	return endpoints, nil
+}
+
+// Parses all arguments and returns a slice of drive paths following the ellipses pattern.
+func parseCacheDrivePaths(arg string) (ep []string, err error) {
+	patterns, perr := ellipses.FindEllipsesPatterns(arg)
+	if perr != nil {
+		return []string{}, uiErrInvalidCacheDrivesValue(nil).Msg(perr.Error())
+	}
+
+	for _, lbls := range patterns.Expand() {
+		ep = append(ep, strings.Join(lbls, ""))
+	}
+
+	return ep, nil
 }
 
 // Parses given cacheExcludesEnv and returns a list of cache exclude patterns.

cmd/disk-cache-config_test.go

@@ -41,12 +41,32 @@ func TestParseCacheDrives(t *testing.T) {
 			expectedPatterns []string
 			success          bool
 		}{"C:/home/drive1;C:/home/drive2;C:/home/drive3", []string{"C:/home/drive1", "C:/home/drive2", "C:/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"C:/home/drive{1...3}", []string{"C:/home/drive1", "C:/home/drive2", "C:/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"C:/home/drive{1..3}", []string{}, false})
 	} else {
 		testCases = append(testCases, struct {
 			driveStr         string
 			expectedPatterns []string
 			success          bool
 		}{"/home/drive1;/home/drive2;/home/drive3", []string{"/home/drive1", "/home/drive2", "/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"/home/drive{1...3}", []string{"/home/drive1", "/home/drive2", "/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"/home/drive{1..3}", []string{}, false})
 	}
 	for i, testCase := range testCases {
 		drives, err := parseCacheDrives(strings.Split(testCase.driveStr, cacheEnvDelimiter))

cmd/disk-cache.go

@@ -32,19 +32,14 @@ import (
 	"github.com/djherbis/atime"
 
 	"github.com/minio/minio/cmd/logger"
-	"github.com/minio/minio/pkg/wildcard"
-
 	"github.com/minio/minio/pkg/hash"
+	"github.com/minio/minio/pkg/wildcard"
 )
 
-// list of all errors that can be ignored in tree walk operation in disk cache
-var cacheTreeWalkIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied, errVolumeNotFound, errFileNotFound)
-
 const (
 	// disk cache needs to have cacheSizeMultiplier * object size space free for a cache entry to be created.
 	cacheSizeMultiplier  = 100
 	cacheTrashDir        = "trash"
-	cacheMaxDiskUsagePct = 80 // in %
 	cacheCleanupInterval = 10 // in minutes
 )
 
@@ -239,7 +234,7 @@ func (c cacheObjects) GetObject(ctx context.Context, bucket, object string, star
 			pipeWriter.CloseWithError(err)
 			return
 		}
-		pipeWriter.Close() // Close writer explicitly signalling we wrote all data.
+		pipeWriter.Close() // Close writer explicitly signaling we wrote all data.
 	}()
 	err = dcache.Put(ctx, bucket, object, hashReader, c.getMetadata(objInfo))
 	if err != nil {
@@ -292,40 +287,32 @@ func (c cacheObjects) GetObjectInfo(ctx context.Context, bucket, object string)
 // Returns function "listDir" of the type listDirFunc.
 // isLeaf - is used by listDir function to check if an entry is a leaf or non-leaf entry.
 // disks - list of fsObjects
-func listDirCacheFactory(isLeaf isLeafFunc, treeWalkIgnoredErrs []error, disks []*cacheFSObjects) listDirFunc {
-	listCacheDirs := func(bucket, prefixDir, prefixEntry string) (dirs []string, err error) {
+func listDirCacheFactory(isLeaf isLeafFunc, disks []*cacheFSObjects) listDirFunc {
+	listCacheDirs := func(bucket, prefixDir, prefixEntry string) (dirs []string) {
 		var entries []string
 		for _, disk := range disks {
 			// ignore disk-caches that might be missing/offline
 			if disk == nil {
 				continue
 			}
-			fs := disk.FSObjects
-			entries, err = readDir(pathJoin(fs.fsPath, bucket, prefixDir))
 
-			// For any reason disk was deleted or goes offline, continue
-			// and list from other disks if possible.
+			fs := disk.FSObjects
+			var err error
+			entries, err = readDir(pathJoin(fs.fsPath, bucket, prefixDir))
 			if err != nil {
-				if IsErrIgnored(err, treeWalkIgnoredErrs...) {
-					continue
-				}
-				return nil, err
+				continue
 			}
 
 			// Filter entries that have the prefix prefixEntry.
 			entries = filterMatchingPrefix(entries, prefixEntry)
 			dirs = append(dirs, entries...)
 		}
-		return dirs, nil
+		return dirs
 	}
 
 	// listDir - lists all the entries at a given prefix and given entry in the prefix.
-	listDir := func(bucket, prefixDir, prefixEntry string) (mergedEntries []string, delayIsLeaf bool, err error) {
-		var cacheEntries []string
-		cacheEntries, err = listCacheDirs(bucket, prefixDir, prefixEntry)
-		if err != nil {
-			return nil, false, err
-		}
+	listDir := func(bucket, prefixDir, prefixEntry string) (mergedEntries []string, delayIsLeaf bool) {
+		cacheEntries := listCacheDirs(bucket, prefixDir, prefixEntry)
 		for _, entry := range cacheEntries {
 			// Find elements in entries which are not in mergedEntries
 			idx := sort.SearchStrings(mergedEntries, entry)
@@ -336,7 +323,7 @@ func listDirCacheFactory(isLeaf isLeafFunc, treeWalkIgnoredErrs []error, disks [
 			mergedEntries = append(mergedEntries, entry)
 			sort.Strings(mergedEntries)
 		}
-		return mergedEntries, false, nil
+		return mergedEntries, false
 	}
 	return listDir
 }
@@ -372,7 +359,7 @@ func (c cacheObjects) listCacheObjects(ctx context.Context, bucket, prefix, mark
 			return fs.isObjectDir(bucket, object)
 		}
 
-		listDir := listDirCacheFactory(isLeaf, cacheTreeWalkIgnoredErrs, c.cache.cfs)
+		listDir := listDirCacheFactory(isLeaf, c.cache.cfs)
 		walkResultCh = startTreeWalk(ctx, bucket, prefix, marker, recursive, listDir, isLeaf, isLeafDir, endWalkCh)
 	}
 
@@ -839,7 +826,7 @@ func newCache(config CacheConfig) (*diskCache, error) {
 		if err := checkAtimeSupport(dir); err != nil {
 			return nil, errors.New("Atime support required for disk caching")
 		}
-		cache, err := newCacheFSObjects(dir, config.Expiry, cacheMaxDiskUsagePct)
+		cache, err := newCacheFSObjects(dir, config.Expiry, config.MaxUse)
 		if err != nil {
 			return nil, err
 		}

cmd/disk-cache_test.go

@@ -19,7 +19,6 @@ package cmd
 import (
 	"bytes"
 	"context"
-	"os"
 	"reflect"
 	"testing"
 	"time"
@@ -28,21 +27,15 @@ import (
 )
 
 // Initialize cache FS objects.
-func initCacheFSObjects(disk string, t *testing.T) (*cacheFSObjects, error) {
-	newTestConfig(globalMinioDefaultRegion)
-	var err error
-	obj, err := newCacheFSObjects(disk, globalCacheExpiry, 100)
-	if err != nil {
-		t.Fatal(err)
-	}
-	return obj, nil
+func initCacheFSObjects(disk string, cacheMaxUse int) (*cacheFSObjects, error) {
+	return newCacheFSObjects(disk, globalCacheExpiry, cacheMaxUse)
 }
 
 // inits diskCache struct for nDisks
-func initDiskCaches(drives []string, t *testing.T) (*diskCache, error) {
+func initDiskCaches(drives []string, cacheMaxUse int, t *testing.T) (*diskCache, error) {
 	var cfs []*cacheFSObjects
 	for _, d := range drives {
-		obj, err := initCacheFSObjects(d, t)
+		obj, err := initCacheFSObjects(d, cacheMaxUse)
 		if err != nil {
 			return nil, err
 		}
@@ -59,7 +52,46 @@ func TestGetCacheFS(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		d, err := initDiskCaches(fsDirs, t)
+		d, err := initDiskCaches(fsDirs, 100, t)
+		if err != nil {
+			t.Fatal(err)
+		}
+		bucketName := "testbucket"
+		objectName := "testobject"
+		ctx := context.Background()
+		// find cache drive where object would be hashed
+		index := d.hashIndex(bucketName, objectName)
+		// turn off drive by setting online status to false
+		d.cfs[index].online = false
+		cfs, err := d.getCacheFS(ctx, bucketName, objectName)
+		if n == 1 && err == errDiskNotFound {
+			continue
+		}
+		if err != nil {
+			t.Fatal(err)
+		}
+		i := -1
+		for j, f := range d.cfs {
+			if f == cfs {
+				i = j
+				break
+			}
+		}
+		if i != (index+1)%n {
+			t.Fatalf("expected next cache location to be picked")
+		}
+	}
+}
+
+// test whether a drive being offline causes
+// getCacheFS to fetch next online drive
+func TestGetCacheFSMaxUse(t *testing.T) {
+	for n := 1; n < 10; n++ {
+		fsDirs, err := getRandomDisks(n)
+		if err != nil {
+			t.Fatal(err)
+		}
+		d, err := initDiskCaches(fsDirs, globalCacheMaxUse, t)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -92,11 +124,6 @@ func TestGetCacheFS(t *testing.T) {
 
 // test wildcard patterns for excluding entries from cache
 func TestCacheExclusion(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(rootPath)
 	fsDirs, err := getRandomDisks(1)
 	if err != nil {
 		t.Fatal(err)
@@ -141,7 +168,7 @@ func TestDiskCache(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	d, err := initDiskCaches(fsDirs, t)
+	d, err := initDiskCaches(fsDirs, 100, t)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -209,6 +236,87 @@ func TestDiskCache(t *testing.T) {
 	}
 }
 
+// Test diskCache with upper bound on max cache use.
+func TestDiskCacheMaxUse(t *testing.T) {
+	fsDirs, err := getRandomDisks(1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	d, err := initDiskCaches(fsDirs, globalCacheMaxUse, t)
+	if err != nil {
+		t.Fatal(err)
+	}
+	cache := d.cfs[0]
+	ctx := context.Background()
+	bucketName := "testbucket"
+	objectName := "testobject"
+	content := "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+	etag := "061208c10af71a30c6dcd6cf5d89f0fe"
+	contentType := "application/zip"
+	size := len(content)
+
+	httpMeta := make(map[string]string)
+	httpMeta["etag"] = etag
+	httpMeta["content-type"] = contentType
+
+	objInfo := ObjectInfo{}
+	objInfo.Bucket = bucketName
+	objInfo.Name = objectName
+	objInfo.Size = int64(size)
+	objInfo.ContentType = contentType
+	objInfo.ETag = etag
+	objInfo.UserDefined = httpMeta
+
+	byteReader := bytes.NewReader([]byte(content))
+	hashReader, err := hash.NewReader(byteReader, int64(size), "", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !cache.diskAvailable(int64(size)) {
+		err = cache.Put(ctx, bucketName, objectName, hashReader, httpMeta)
+		if err != errDiskFull {
+			t.Fatal("Cache max-use limit violated.")
+		}
+	} else {
+		err = cache.Put(ctx, bucketName, objectName, hashReader, httpMeta)
+		if err != nil {
+			t.Fatal(err)
+		}
+		cachedObjInfo, err := cache.GetObjectInfo(ctx, bucketName, objectName)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !cache.Exists(ctx, bucketName, objectName) {
+			t.Fatal("Expected object to exist on cache")
+		}
+		if cachedObjInfo.ETag != objInfo.ETag {
+			t.Fatal("Expected ETag to match")
+		}
+		if cachedObjInfo.Size != objInfo.Size {
+			t.Fatal("Size mismatch")
+		}
+		if cachedObjInfo.ContentType != objInfo.ContentType {
+			t.Fatal("Cached content-type does not match")
+		}
+		writer := bytes.NewBuffer(nil)
+		err = cache.Get(ctx, bucketName, objectName, 0, int64(size), writer, "")
+		if err != nil {
+			t.Fatal(err)
+		}
+		if ccontent := writer.Bytes(); !bytes.Equal([]byte(content), ccontent) {
+			t.Errorf("wrong cached file content")
+		}
+		err = cache.Delete(ctx, bucketName, objectName)
+		if err != nil {
+			t.Errorf("object missing from cache")
+		}
+		online := cache.IsOnline()
+		if !online {
+			t.Errorf("expected cache drive to be online")
+		}
+	}
+}
+
 func TestIsCacheExcludeDirective(t *testing.T) {
 	testCases := []struct {
 		cacheControlOpt string

cmd/dummy-object-layer_test.go

@@ -19,7 +19,6 @@ package cmd
 import (
 	"context"
 	"io"
-	"time"
 
 	"github.com/minio/minio/pkg/hash"
 	"github.com/minio/minio/pkg/madmin"
@@ -132,14 +131,6 @@ func (api *DummyObjectLayer) ListObjectsHeal(ctx context.Context, bucket, prefix
 	return
 }
 
-func (api *DummyObjectLayer) ListLocks(ctx context.Context, bucket, prefix string, duration time.Duration) (info []VolumeLockInfo, err error) {
-	return
-}
-
-func (api *DummyObjectLayer) ClearLocks(context.Context, []VolumeLockInfo) (err error) {
-	return
-}
-
 func (api *DummyObjectLayer) SetBucketPolicy(context.Context, string, *policy.Policy) (err error) {
 	return
 }

cmd/encryption-v1.go

@@ -17,19 +17,18 @@
 package cmd
 
 import (
-	"bytes"
 	"context"
 	"crypto/hmac"
-	"crypto/md5"
 	"crypto/rand"
 	"crypto/subtle"
-	"encoding/base64"
 	"encoding/binary"
 	"errors"
 	"io"
 	"net/http"
+	"path"
 	"strconv"
 
+	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/ioutil"
 	sha256 "github.com/minio/sha256-simd"
@@ -40,34 +39,12 @@ var (
 	// AWS errors for invalid SSE-C requests.
 	errInsecureSSERequest   = errors.New("SSE-C requests require TLS connections")
 	errEncryptedObject      = errors.New("The object was stored using a form of SSE")
-	errInvalidSSEAlgorithm  = errors.New("The SSE-C algorithm is not valid")
-	errMissingSSEKey        = errors.New("The SSE-C request is missing the customer key")
-	errInvalidSSEKey        = errors.New("The SSE-C key is invalid")
-	errMissingSSEKeyMD5     = errors.New("The SSE-C request is missing the customer key MD5")
-	errSSEKeyMD5Mismatch    = errors.New("The key MD5 does not match the SSE-C key")
-	errSSEKeyMismatch       = errors.New("The SSE-C key is not correct")                  // access denied
 	errInvalidSSEParameters = errors.New("The SSE-C key for key-rotation is not correct") // special access denied
-
+	errKMSNotConfigured     = errors.New("KMS not configured for a server side encrypted object")
 	// Additional Minio errors for SSE-C requests.
 	errObjectTampered = errors.New("The requested object was modified and may be compromised")
 )
 
-const (
-	// SSECustomerAlgorithm is the AWS SSE-C algorithm HTTP header key.
-	SSECustomerAlgorithm = "X-Amz-Server-Side-Encryption-Customer-Algorithm"
-	// SSECustomerKey is the AWS SSE-C encryption key HTTP header key.
-	SSECustomerKey = "X-Amz-Server-Side-Encryption-Customer-Key"
-	// SSECustomerKeyMD5 is the AWS SSE-C encryption key MD5 HTTP header key.
-	SSECustomerKeyMD5 = "X-Amz-Server-Side-Encryption-Customer-Key-MD5"
-
-	// SSECopyCustomerAlgorithm is the AWS SSE-C algorithm HTTP header key for CopyObject API.
-	SSECopyCustomerAlgorithm = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm"
-	// SSECopyCustomerKey is the AWS SSE-C encryption key HTTP header key for CopyObject API.
-	SSECopyCustomerKey = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key"
-	// SSECopyCustomerKeyMD5 is the AWS SSE-C encryption key MD5 HTTP header key for CopyObject API.
-	SSECopyCustomerKeyMD5 = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-MD5"
-)
-
 const (
 	// SSECustomerKeySize is the size of valid client provided encryption keys in bytes.
 	// Currently AWS supports only AES256. So the SSE-C key size is fixed to 32 bytes.
@@ -76,9 +53,6 @@ const (
 	// SSEIVSize is the size of the IV data
 	SSEIVSize = 32 // 32 bytes
 
-	// SSECustomerAlgorithmAES256 the only valid S3 SSE-C encryption algorithm identifier.
-	SSECustomerAlgorithmAES256 = "AES256"
-
 	// SSE dare package block size.
 	sseDAREPackageBlockSize = 64 * 1024 // 64KiB bytes
 
@@ -87,82 +61,26 @@ const (
 
 )
 
-// SSE-C key derivation, key verification and key update:
-// H: Hash function [32 = |H(m)|]
-// AE: authenticated encryption scheme, AD: authenticated decryption scheme [m = AD(k, AE(k, m))]
-//
-// Key derivation:
-// 	 Input:
-// 		key     := 32 bytes              # client provided key
-// 		Re, Rm  := 32 bytes, 32 bytes    # uniformly random
-//
-//   Seal:
-// 		k       := H(key || Re)          # object encryption key
-// 		r       := H(Rm)                 # save as object metadata [ServerSideEncryptionIV]
-//		KeK     := H(key || r)           # key encryption key
-// 		K       := AE(KeK, k)            # save as object metadata [ServerSideEncryptionSealedKey]
-// ------------------------------------------------------------------------------------------------
-// Key verification:
-// 	 Input:
-// 		key     := 32 bytes              # client provided key
-// 		r       := 32 bytes              # object metadata [ServerSideEncryptionIV]
-// 		K       := 32 bytes              # object metadata [ServerSideEncryptionSealedKey]
-//
-//   Open:
-//		KeK     := H(key || r)           # key encryption key
-//		k       := AD(Kek, K)            # object encryption key
-// -------------------------------------------------------------------------------------------------
-// Key update:
-// 	 Input:
-// 		key     := 32 bytes              # old client provided key
-// 		key'    := 32 bytes              # new client provided key
-// 		Rm      := 32 bytes              # uniformly random
-// 		r       := 32 bytes              # object metadata [ServerSideEncryptionIV]
-// 		K       := 32 bytes              # object metadata [ServerSideEncryptionSealedKey]
-//
-//   Update:
-//      1. open:
-//			KeK     := H(key || r)       # key encryption key
-//			k       := AD(Kek, K)        # object encryption key
-//      2. seal:
-//			r'      := H(Rm)			 # save as object metadata [ServerSideEncryptionIV]
-//			KeK'    := H(key' || r')	 # new key encryption key
-// 			K'      := AE(KeK', k)       # save as object metadata [ServerSideEncryptionSealedKey]
-
 const (
-	// ServerSideEncryptionIV is a 32 byte randomly generated IV used to derive an
-	// unique key encryption key from the client provided key. The combination of this value
-	// and the client-provided key MUST be unique.
-	ServerSideEncryptionIV = ReservedMetadataPrefix + "Server-Side-Encryption-Iv"
+	// SSESealAlgorithmDareSha256 specifies DARE as authenticated en/decryption scheme and SHA256 as cryptographic
+	// hash function. The key derivation of DARE-SHA256 is not optimal and does not include the object path.
+	// It is considered legacy and should not be used anymore.
+	SSESealAlgorithmDareSha256 = "DARE-SHA256"
 
-	// ServerSideEncryptionSealAlgorithm identifies a combination of a cryptographic hash function and
-	// an authenticated en/decryption scheme to seal the object encryption key.
-	ServerSideEncryptionSealAlgorithm = ReservedMetadataPrefix + "Server-Side-Encryption-Seal-Algorithm"
-
-	// ServerSideEncryptionSealedKey is the sealed object encryption key. The sealed key can be decrypted
-	// by the key encryption key derived from the client provided key and the server-side-encryption IV.
-	ServerSideEncryptionSealedKey = ReservedMetadataPrefix + "Server-Side-Encryption-Sealed-Key"
+	// SSESealAlgorithmDareV2HmacSha256 specifies DAREv2 as authenticated en/decryption scheme and SHA256 as cryptographic
+	// hash function for the HMAC PRF.
+	SSESealAlgorithmDareV2HmacSha256 = "DAREv2-HMAC-SHA256"
 )
 
-// SSESealAlgorithmDareSha256 specifies DARE as authenticated en/decryption scheme and SHA256 as cryptographic
-// hash function.
-const SSESealAlgorithmDareSha256 = "DARE-SHA256"
-
-// hasSSECustomerHeader returns true if the given HTTP header
-// contains server-side-encryption with customer provided key fields.
-func hasSSECustomerHeader(header http.Header) bool {
-	return header.Get(SSECustomerAlgorithm) != "" || header.Get(SSECustomerKey) != "" || header.Get(SSECustomerKeyMD5) != ""
-}
-
-// hasSSECopyCustomerHeader returns true if the given HTTP header
-// contains copy source server-side-encryption with customer provided key fields.
-func hasSSECopyCustomerHeader(header http.Header) bool {
-	return header.Get(SSECopyCustomerAlgorithm) != "" || header.Get(SSECopyCustomerKey) != "" || header.Get(SSECopyCustomerKeyMD5) != ""
+// hasServerSideEncryptionHeader returns true if the given HTTP header
+// contains server-side-encryption.
+func hasServerSideEncryptionHeader(header http.Header) bool {
+	return crypto.S3.IsRequested(header) || crypto.SSEC.IsRequested(header)
 }
 
 // ParseSSECopyCustomerRequest parses the SSE-C header fields of the provided request.
 // It returns the client provided key on success.
-func ParseSSECopyCustomerRequest(r *http.Request) (key []byte, err error) {
+func ParseSSECopyCustomerRequest(r *http.Request, metadata map[string]string) (key []byte, err error) {
 	if !globalIsSSL { // minio only supports HTTP or HTTPS requests not both at the same time
 		// we cannot use r.TLS == nil here because Go's http implementation reflects on
 		// the net.Conn and sets the TLS field of http.Request only if it's an tls.Conn.
@@ -170,36 +88,11 @@ func ParseSSECopyCustomerRequest(r *http.Request) (key []byte, err error) {
 		// will always fail -> r.TLS is always nil even for TLS requests.
 		return nil, errInsecureSSERequest
 	}
-	header := r.Header
-	if algorithm := header.Get(SSECopyCustomerAlgorithm); algorithm != SSECustomerAlgorithmAES256 {
-		return nil, errInvalidSSEAlgorithm
+	if crypto.S3.IsEncrypted(metadata) && crypto.SSECopy.IsRequested(r.Header) {
+		return nil, crypto.ErrIncompatibleEncryptionMethod
 	}
-	if header.Get(SSECopyCustomerKey) == "" {
-		return nil, errMissingSSEKey
-	}
-	if header.Get(SSECopyCustomerKeyMD5) == "" {
-		return nil, errMissingSSEKeyMD5
-	}
-
-	key, err = base64.StdEncoding.DecodeString(header.Get(SSECopyCustomerKey))
-	if err != nil {
-		return nil, errInvalidSSEKey
-	}
-
-	if len(key) != SSECustomerKeySize {
-		return nil, errInvalidSSEKey
-	}
-	// Make sure we purged the keys from http headers by now.
-	header.Del(SSECopyCustomerKey)
-
-	keyMD5, err := base64.StdEncoding.DecodeString(header.Get(SSECopyCustomerKeyMD5))
-	if err != nil {
-		return nil, errSSEKeyMD5Mismatch
-	}
-	if md5Sum := md5.Sum(key); !bytes.Equal(md5Sum[:], keyMD5) {
-		return nil, errSSEKeyMD5Mismatch
-	}
-	return key, nil
+	k, err := crypto.SSECopy.ParseHTTP(r.Header)
+	return k[:], err
 }
 
 // ParseSSECustomerRequest parses the SSE-C header fields of the provided request.
@@ -218,209 +111,182 @@ func ParseSSECustomerHeader(header http.Header) (key []byte, err error) {
 		// will always fail -> r.TLS is always nil even for TLS requests.
 		return nil, errInsecureSSERequest
 	}
-	if algorithm := header.Get(SSECustomerAlgorithm); algorithm != SSECustomerAlgorithmAES256 {
-		return nil, errInvalidSSEAlgorithm
-	}
-	if header.Get(SSECustomerKey) == "" {
-		return nil, errMissingSSEKey
-	}
-	if header.Get(SSECustomerKeyMD5) == "" {
-		return nil, errMissingSSEKeyMD5
+	if crypto.S3.IsRequested(header) && crypto.SSEC.IsRequested(header) {
+		return key, crypto.ErrIncompatibleEncryptionMethod
 	}
 
-	key, err = base64.StdEncoding.DecodeString(header.Get(SSECustomerKey))
-	if err != nil {
-		return nil, errInvalidSSEKey
-	}
-
-	if len(key) != SSECustomerKeySize {
-		return nil, errInvalidSSEKey
-	}
-	// Make sure we purged the keys from http headers by now.
-	header.Del(SSECustomerKey)
-
-	keyMD5, err := base64.StdEncoding.DecodeString(header.Get(SSECustomerKeyMD5))
-	if err != nil {
-		return nil, errSSEKeyMD5Mismatch
-	}
-	if md5Sum := md5.Sum(key); !bytes.Equal(md5Sum[:], keyMD5) {
-		return nil, errSSEKeyMD5Mismatch
-	}
-	return key, nil
+	k, err := crypto.SSEC.ParseHTTP(header)
+	return k[:], err
 }
 
 // This function rotates old to new key.
-func rotateKey(oldKey []byte, newKey []byte, metadata map[string]string) error {
-	delete(metadata, SSECustomerKey) // make sure we do not save the key by accident
+func rotateKey(oldKey []byte, newKey []byte, bucket, object string, metadata map[string]string) error {
+	delete(metadata, crypto.SSECKey) // make sure we do not save the key by accident
 
-	if metadata[ServerSideEncryptionSealAlgorithm] != SSESealAlgorithmDareSha256 { // currently DARE-SHA256 is the only option
+	switch {
+	default:
 		return errObjectTampered
-	}
-	iv, err := base64.StdEncoding.DecodeString(metadata[ServerSideEncryptionIV])
-	if err != nil || len(iv) != SSEIVSize {
-		return errObjectTampered
-	}
-	sealedKey, err := base64.StdEncoding.DecodeString(metadata[ServerSideEncryptionSealedKey])
-	if err != nil || len(sealedKey) != 64 {
-		return errObjectTampered
-	}
-
-	sha := sha256.New() // derive key encryption key
-	sha.Write(oldKey)
-	sha.Write(iv)
-	keyEncryptionKey := sha.Sum(nil)
-
-	objectEncryptionKey := bytes.NewBuffer(nil) // decrypt object encryption key
-	n, err := sio.Decrypt(objectEncryptionKey, bytes.NewReader(sealedKey), sio.Config{
-		Key: keyEncryptionKey,
-	})
-	if n != 32 || err != nil { // Either the provided key does not match or the object was tampered.
-		if subtle.ConstantTimeCompare(oldKey, newKey) == 1 {
-			return errInvalidSSEParameters // AWS returns special error for equal but invalid keys.
+	case crypto.SSEC.IsEncrypted(metadata):
+		sealedKey, err := crypto.SSEC.ParseMetadata(metadata)
+		if err != nil {
+			return err
 		}
-		return errSSEKeyMismatch // To provide strict AWS S3 compatibility we return: access denied.
-	}
-	if subtle.ConstantTimeCompare(oldKey, newKey) == 1 {
-		return nil // we don't need to rotate keys if newKey == oldKey
-	}
 
-	nonce := make([]byte, 32) // generate random values for key derivation
-	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
-		return err
+		var objectKey crypto.ObjectKey
+		var extKey [32]byte
+		copy(extKey[:], oldKey)
+		if err = objectKey.Unseal(extKey, sealedKey, crypto.SSEC.String(), bucket, object); err != nil {
+			if subtle.ConstantTimeCompare(oldKey, newKey) == 1 {
+				return errInvalidSSEParameters // AWS returns special error for equal but invalid keys.
+			}
+			return crypto.ErrInvalidCustomerKey // To provide strict AWS S3 compatibility we return: access denied.
+
+		}
+		if subtle.ConstantTimeCompare(oldKey, newKey) == 1 && sealedKey.Algorithm == crypto.SealAlgorithm {
+			return nil // don't rotate on equal keys if seal algorithm is latest
+		}
+		copy(extKey[:], newKey)
+		sealedKey = objectKey.Seal(extKey, sealedKey.IV, crypto.SSEC.String(), bucket, object)
+		return nil
 	}
-
-	niv := sha256.Sum256(nonce[:]) // derive key encryption key
-	sha = sha256.New()
-	sha.Write(newKey)
-	sha.Write(niv[:])
-	keyEncryptionKey = sha.Sum(nil)
-
-	sealedKeyW := bytes.NewBuffer(nil) // sealedKey := 16 byte header + 32 byte payload + 16 byte tag
-	n, err = sio.Encrypt(sealedKeyW, bytes.NewReader(objectEncryptionKey.Bytes()), sio.Config{
-		Key: keyEncryptionKey,
-	})
-	if n != 64 || err != nil {
-		return errors.New("failed to seal object encryption key") // if this happens there's a bug in the code (may panic ?)
-	}
-
-	metadata[ServerSideEncryptionIV] = base64.StdEncoding.EncodeToString(niv[:])
-	metadata[ServerSideEncryptionSealAlgorithm] = SSESealAlgorithmDareSha256
-	metadata[ServerSideEncryptionSealedKey] = base64.StdEncoding.EncodeToString(sealedKeyW.Bytes())
-	return nil
 }
 
-func newEncryptMetadata(key []byte, metadata map[string]string) ([]byte, error) {
-	delete(metadata, SSECustomerKey) // make sure we do not save the key by accident
+func newEncryptMetadata(key []byte, bucket, object string, metadata map[string]string, sseS3 bool) ([]byte, error) {
+	delete(metadata, crypto.SSECKey) // make sure we do not save the key by accident
 
-	// security notice:
-	//  - If the first 32 bytes of the random value are ever repeated under the same client-provided
-	//    key the encrypted object will not be tamper-proof. [ P(coll) ~= 1 / 2^(256 / 2)]
-	//  - If the last 32 bytes of the random value are ever repeated under the same client-provided
-	//    key an adversary may be able to extract the object encryption key. This depends on the
-	//    authenticated en/decryption scheme. The DARE format will generate an 8 byte nonce which must
-	//    be repeated in addition to reveal the object encryption key.
-	//    [ P(coll) ~= 1 / 2^((256 + 64) / 2) ]
-	nonce := make([]byte, 32+SSEIVSize) // generate random values for key derivation
-	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
-		return nil, err
+	var sealedKey crypto.SealedKey
+	if sseS3 {
+		if globalKMS == nil {
+			return nil, errKMSNotConfigured
+		}
+		key, encKey, err := globalKMS.GenerateKey(globalKMSKeyID, crypto.Context{bucket: path.Join(bucket, object)})
+		if err != nil {
+			return nil, err
+		}
+
+		objectKey := crypto.GenerateKey(key, rand.Reader)
+		sealedKey = objectKey.Seal(key, crypto.GenerateIV(rand.Reader), crypto.S3.String(), bucket, object)
+		crypto.S3.CreateMetadata(metadata, globalKMSKeyID, encKey, sealedKey)
+		return objectKey[:], nil
 	}
-	sha := sha256.New() // derive object encryption key
-	sha.Write(key)
-	sha.Write(nonce[:32])
-	objectEncryptionKey := sha.Sum(nil)
+	var extKey [32]byte
+	copy(extKey[:], key)
+	objectKey := crypto.GenerateKey(extKey, rand.Reader)
+	sealedKey = objectKey.Seal(extKey, crypto.GenerateIV(rand.Reader), crypto.SSEC.String(), bucket, object)
+	crypto.SSEC.CreateMetadata(metadata, sealedKey)
+	return objectKey[:], nil
 
-	iv := sha256.Sum256(nonce[32:]) // derive key encryption key
-	sha = sha256.New()
-	sha.Write(key)
-	sha.Write(iv[:])
-	keyEncryptionKey := sha.Sum(nil)
-
-	sealedKey := bytes.NewBuffer(nil) // sealedKey := 16 byte header + 32 byte payload + 16 byte tag
-	n, err := sio.Encrypt(sealedKey, bytes.NewReader(objectEncryptionKey), sio.Config{
-		Key: keyEncryptionKey,
-	})
-	if n != 64 || err != nil {
-		return nil, errors.New("failed to seal object encryption key") // if this happens there's a bug in the code (may panic ?)
-	}
-
-	metadata[ServerSideEncryptionIV] = base64.StdEncoding.EncodeToString(iv[:])
-	metadata[ServerSideEncryptionSealAlgorithm] = SSESealAlgorithmDareSha256
-	metadata[ServerSideEncryptionSealedKey] = base64.StdEncoding.EncodeToString(sealedKey.Bytes())
-
-	return objectEncryptionKey, nil
 }
 
-func newEncryptReader(content io.Reader, key []byte, metadata map[string]string) (io.Reader, error) {
-	objectEncryptionKey, err := newEncryptMetadata(key, metadata)
+func newEncryptReader(content io.Reader, key []byte, bucket, object string, metadata map[string]string, sseS3 bool) (io.Reader, error) {
+	objectEncryptionKey, err := newEncryptMetadata(key, bucket, object, metadata, sseS3)
 	if err != nil {
 		return nil, err
 	}
 
-	reader, err := sio.EncryptReader(content, sio.Config{Key: objectEncryptionKey})
+	reader, err := sio.EncryptReader(content, sio.Config{Key: objectEncryptionKey[:], MinVersion: sio.Version20})
 	if err != nil {
-		return nil, errInvalidSSEKey
+		return nil, crypto.ErrInvalidCustomerKey
 	}
 
 	return reader, nil
 }
 
+// set new encryption metadata from http request headers for SSE-C and generated key from KMS in the case of
+// SSE-S3
+func setEncryptionMetadata(r *http.Request, bucket, object string, metadata map[string]string) (err error) {
+	var (
+		key []byte
+	)
+	if crypto.SSEC.IsRequested(r.Header) {
+		key, err = ParseSSECustomerRequest(r)
+		if err != nil {
+			return
+		}
+	}
+	_, err = newEncryptMetadata(key, bucket, object, metadata, crypto.S3.IsRequested(r.Header))
+	return
+}
+
 // EncryptRequest takes the client provided content and encrypts the data
 // with the client provided key. It also marks the object as client-side-encrypted
 // and sets the correct headers.
-func EncryptRequest(content io.Reader, r *http.Request, metadata map[string]string) (io.Reader, error) {
-	key, err := ParseSSECustomerRequest(r)
-	if err != nil {
-		return nil, err
+func EncryptRequest(content io.Reader, r *http.Request, bucket, object string, metadata map[string]string) (io.Reader, error) {
+
+	var (
+		key []byte
+		err error
+	)
+	if crypto.S3.IsRequested(r.Header) && crypto.SSEC.IsRequested(r.Header) {
+		return nil, crypto.ErrIncompatibleEncryptionMethod
 	}
-	return newEncryptReader(content, key, metadata)
+	if crypto.SSEC.IsRequested(r.Header) {
+		key, err = ParseSSECustomerRequest(r)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return newEncryptReader(content, key, bucket, object, metadata, crypto.S3.IsRequested(r.Header))
 }
 
 // DecryptCopyRequest decrypts the object with the client provided key. It also removes
 // the client-side-encryption metadata from the object and sets the correct headers.
-func DecryptCopyRequest(client io.Writer, r *http.Request, metadata map[string]string) (io.WriteCloser, error) {
-	key, err := ParseSSECopyCustomerRequest(r)
-	if err != nil {
-		return nil, err
+func DecryptCopyRequest(client io.Writer, r *http.Request, bucket, object string, metadata map[string]string) (io.WriteCloser, error) {
+	var (
+		key []byte
+		err error
+	)
+	if crypto.SSECopy.IsRequested(r.Header) {
+		key, err = ParseSSECopyCustomerRequest(r, metadata)
+		if err != nil {
+			return nil, err
+		}
 	}
-	delete(metadata, SSECopyCustomerKey) // make sure we do not save the key by accident
-	return newDecryptWriter(client, key, 0, metadata)
+	delete(metadata, crypto.SSECopyKey) // make sure we do not save the key by accident
+	return newDecryptWriter(client, key, bucket, object, 0, metadata)
 }
 
-func decryptObjectInfo(key []byte, metadata map[string]string) ([]byte, error) {
-	if metadata[ServerSideEncryptionSealAlgorithm] != SSESealAlgorithmDareSha256 { // currently DARE-SHA256 is the only option
+func decryptObjectInfo(key []byte, bucket, object string, metadata map[string]string) ([]byte, error) {
+	switch {
+	default:
 		return nil, errObjectTampered
-	}
-	iv, err := base64.StdEncoding.DecodeString(metadata[ServerSideEncryptionIV])
-	if err != nil || len(iv) != SSEIVSize {
-		return nil, errObjectTampered
-	}
-	sealedKey, err := base64.StdEncoding.DecodeString(metadata[ServerSideEncryptionSealedKey])
-	if err != nil || len(sealedKey) != 64 {
-		return nil, errObjectTampered
-	}
+	case crypto.S3.IsEncrypted(metadata):
+		if globalKMS == nil {
+			return nil, errKMSNotConfigured
+		}
+		keyID, kmsKey, sealedKey, err := crypto.S3.ParseMetadata(metadata)
 
-	sha := sha256.New() // derive key encryption key
-	sha.Write(key)
-	sha.Write(iv)
-	keyEncryptionKey := sha.Sum(nil)
-
-	objectEncryptionKey := bytes.NewBuffer(nil) // decrypt object encryption key
-	n, err := sio.Decrypt(objectEncryptionKey, bytes.NewReader(sealedKey), sio.Config{
-		Key: keyEncryptionKey,
-	})
-	if n != 32 || err != nil {
-		// Either the provided key does not match or the object was tampered.
-		// To provide strict AWS S3 compatibility we return: access denied.
-		return nil, errSSEKeyMismatch
+		if err != nil {
+			return nil, err
+		}
+		extKey, err := globalKMS.UnsealKey(keyID, kmsKey, crypto.Context{bucket: path.Join(bucket, object)})
+		if err != nil {
+			return nil, err
+		}
+		var objectKey crypto.ObjectKey
+		if err = objectKey.Unseal(extKey, sealedKey, crypto.S3.String(), bucket, object); err != nil {
+			return nil, err
+		}
+		return objectKey[:], nil
+	case crypto.SSEC.IsEncrypted(metadata):
+		var extKey [32]byte
+		copy(extKey[:], key)
+		sealedKey, err := crypto.SSEC.ParseMetadata(metadata)
+		if err != nil {
+			return nil, err
+		}
+		var objectKey crypto.ObjectKey
+		if err = objectKey.Unseal(extKey, sealedKey, crypto.SSEC.String(), bucket, object); err != nil {
+			return nil, err
+		}
+		return objectKey[:], nil
 	}
-	return objectEncryptionKey.Bytes(), nil
 }
 
-func newDecryptWriter(client io.Writer, key []byte, seqNumber uint32, metadata map[string]string) (io.WriteCloser, error) {
-	objectEncryptionKey, err := decryptObjectInfo(key, metadata)
+func newDecryptWriter(client io.Writer, key []byte, bucket, object string, seqNumber uint32, metadata map[string]string) (io.WriteCloser, error) {
+	objectEncryptionKey, err := decryptObjectInfo(key, bucket, object, metadata)
 	if err != nil {
 		return nil, err
-
 	}
 	return newDecryptWriterWithObjectKey(client, objectEncryptionKey, seqNumber, metadata)
 }
@@ -431,31 +297,37 @@ func newDecryptWriterWithObjectKey(client io.Writer, objectEncryptionKey []byte,
 		SequenceNumber: seqNumber,
 	})
 	if err != nil {
-		return nil, errInvalidSSEKey
+		return nil, crypto.ErrInvalidCustomerKey
 	}
-
-	delete(metadata, ServerSideEncryptionIV)
-	delete(metadata, ServerSideEncryptionSealAlgorithm)
-	delete(metadata, ServerSideEncryptionSealedKey)
-	delete(metadata, ReservedMetadataPrefix+"Encrypted-Multipart")
+	delete(metadata, crypto.SSEIV)
+	delete(metadata, crypto.SSESealAlgorithm)
+	delete(metadata, crypto.SSECSealedKey)
+	delete(metadata, crypto.SSEMultipart)
+	delete(metadata, crypto.S3SealedKey)
+	delete(metadata, crypto.S3KMSSealedKey)
+	delete(metadata, crypto.S3KMSKeyID)
 	return writer, nil
 }
 
 // DecryptRequestWithSequenceNumber decrypts the object with the client provided key. It also removes
 // the client-side-encryption metadata from the object and sets the correct headers.
-func DecryptRequestWithSequenceNumber(client io.Writer, r *http.Request, seqNumber uint32, metadata map[string]string) (io.WriteCloser, error) {
+func DecryptRequestWithSequenceNumber(client io.Writer, r *http.Request, bucket, object string, seqNumber uint32, metadata map[string]string) (io.WriteCloser, error) {
+	if crypto.S3.IsEncrypted(metadata) {
+		return newDecryptWriter(client, nil, bucket, object, seqNumber, metadata)
+	}
+
 	key, err := ParseSSECustomerRequest(r)
 	if err != nil {
 		return nil, err
 	}
-	delete(metadata, SSECustomerKey) // make sure we do not save the key by accident
-	return newDecryptWriter(client, key, seqNumber, metadata)
+	delete(metadata, crypto.SSECKey) // make sure we do not save the key by accident
+	return newDecryptWriter(client, key, bucket, object, seqNumber, metadata)
 }
 
-// DecryptRequest decrypts the object with the client provided key. It also removes
-// the client-side-encryption metadata from the object and sets the correct headers.
-func DecryptRequest(client io.Writer, r *http.Request, metadata map[string]string) (io.WriteCloser, error) {
-	return DecryptRequestWithSequenceNumber(client, r, 0, metadata)
+// DecryptRequest decrypts the object with client provided key for SSE-C and SSE-S3. It also removes
+// the encryption metadata from the object and sets the correct headers.
+func DecryptRequest(client io.Writer, r *http.Request, bucket, object string, metadata map[string]string) (io.WriteCloser, error) {
+	return DecryptRequestWithSequenceNumber(client, r, bucket, object, 0, metadata)
 }
 
 // DecryptBlocksWriter - decrypts multipart parts, while implementing a io.Writer compatible interface.
@@ -469,9 +341,10 @@ type DecryptBlocksWriter struct {
 	// Current part index
 	partIndex int
 	// Parts information
-	parts    []objectPartInfo
-	req      *http.Request
-	metadata map[string]string
+	parts          []objectPartInfo
+	req            *http.Request
+	bucket, object string
+	metadata       map[string]string
 
 	partEncRelOffset int64
 
@@ -489,17 +362,21 @@ func (w *DecryptBlocksWriter) buildDecrypter(partID int) error {
 	var key []byte
 	var err error
 	if w.copySource {
-		w.req.Header.Set(SSECopyCustomerKey, w.customerKeyHeader)
-		key, err = ParseSSECopyCustomerRequest(w.req)
+		if crypto.SSEC.IsEncrypted(w.metadata) {
+			w.req.Header.Set(crypto.SSECopyKey, w.customerKeyHeader)
+			key, err = ParseSSECopyCustomerRequest(w.req, w.metadata)
+		}
 	} else {
-		w.req.Header.Set(SSECustomerKey, w.customerKeyHeader)
-		key, err = ParseSSECustomerRequest(w.req)
+		if crypto.SSEC.IsEncrypted(w.metadata) {
+			w.req.Header.Set(crypto.SSECKey, w.customerKeyHeader)
+			key, err = ParseSSECustomerRequest(w.req)
+		}
 	}
 	if err != nil {
 		return err
 	}
 
-	objectEncryptionKey, err := decryptObjectInfo(key, m)
+	objectEncryptionKey, err := decryptObjectInfo(key, w.bucket, w.object, m)
 	if err != nil {
 		return err
 	}
@@ -513,9 +390,9 @@ func (w *DecryptBlocksWriter) buildDecrypter(partID int) error {
 
 	// make sure we do not save the key by accident
 	if w.copySource {
-		delete(m, SSECopyCustomerKey)
+		delete(m, crypto.SSECopyKey)
 	} else {
-		delete(m, SSECustomerKey)
+		delete(m, crypto.SSECKey)
 	}
 
 	// make sure to provide a NopCloser such that a Close
@@ -594,29 +471,26 @@ func (w *DecryptBlocksWriter) Close() error {
 // DecryptAllBlocksCopyRequest - setup a struct which can decrypt many concatenated encrypted data
 // parts information helps to know the boundaries of each encrypted data block, this function decrypts
 // all parts starting from part-1.
-func DecryptAllBlocksCopyRequest(client io.Writer, r *http.Request, objInfo ObjectInfo) (io.WriteCloser, int64, error) {
-	w, _, size, err := DecryptBlocksRequest(client, r, 0, objInfo.Size, objInfo, true)
+func DecryptAllBlocksCopyRequest(client io.Writer, r *http.Request, bucket, object string, objInfo ObjectInfo) (io.WriteCloser, int64, error) {
+	w, _, size, err := DecryptBlocksRequest(client, r, bucket, object, 0, objInfo.Size, objInfo, true)
 	return w, size, err
 }
 
 // DecryptBlocksRequest - setup a struct which can decrypt many concatenated encrypted data
 // parts information helps to know the boundaries of each encrypted data block.
-func DecryptBlocksRequest(client io.Writer, r *http.Request, startOffset, length int64, objInfo ObjectInfo, copySource bool) (io.WriteCloser, int64, int64, error) {
-	seqNumber, encStartOffset, encLength := getEncryptedStartOffset(startOffset, length)
+func DecryptBlocksRequest(client io.Writer, r *http.Request, bucket, object string, startOffset, length int64, objInfo ObjectInfo, copySource bool) (io.WriteCloser, int64, int64, error) {
+	var seqNumber uint32
+	var encStartOffset, encLength int64
 
-	// Encryption length cannot be bigger than the file size, if it is
-	// which is allowed in AWS S3, we simply default to EncryptedSize().
-	if encLength+encStartOffset > objInfo.EncryptedSize() {
-		encLength = objInfo.EncryptedSize() - encStartOffset
-	}
+	if len(objInfo.Parts) == 0 || !crypto.IsMultiPart(objInfo.UserDefined) {
+		seqNumber, encStartOffset, encLength = getEncryptedSinglePartOffsetLength(startOffset, length, objInfo)
 
-	if len(objInfo.Parts) == 0 || !objInfo.IsEncryptedMultipart() {
 		var writer io.WriteCloser
 		var err error
 		if copySource {
-			writer, err = DecryptCopyRequest(client, r, objInfo.UserDefined)
+			writer, err = DecryptCopyRequest(client, r, bucket, object, objInfo.UserDefined)
 		} else {
-			writer, err = DecryptRequestWithSequenceNumber(client, r, seqNumber, objInfo.UserDefined)
+			writer, err = DecryptRequestWithSequenceNumber(client, r, bucket, object, seqNumber, objInfo.UserDefined)
 		}
 		if err != nil {
 			return nil, 0, 0, err
@@ -624,6 +498,7 @@ func DecryptBlocksRequest(client io.Writer, r *http.Request, startOffset, length
 		return writer, encStartOffset, encLength, nil
 	}
 
+	seqNumber, encStartOffset, encLength = getEncryptedMultipartsOffsetLength(startOffset, length, objInfo)
 	var partStartIndex int
 	var partStartOffset = startOffset
 	// Skip parts until final offset maps to a particular part offset.
@@ -656,7 +531,9 @@ func DecryptBlocksRequest(client io.Writer, r *http.Request, startOffset, length
 		parts:             objInfo.Parts,
 		partIndex:         partStartIndex,
 		req:               r,
-		customerKeyHeader: r.Header.Get(SSECustomerKey),
+		bucket:            bucket,
+		object:            object,
+		customerKeyHeader: r.Header.Get(crypto.SSECKey),
 		copySource:        copySource,
 	}
 
@@ -667,24 +544,76 @@ func DecryptBlocksRequest(client io.Writer, r *http.Request, startOffset, length
 	}
 
 	// Purge all the encryption headers.
-	delete(objInfo.UserDefined, ServerSideEncryptionIV)
-	delete(objInfo.UserDefined, ServerSideEncryptionSealAlgorithm)
-	delete(objInfo.UserDefined, ServerSideEncryptionSealedKey)
-	delete(objInfo.UserDefined, ReservedMetadataPrefix+"Encrypted-Multipart")
+	delete(objInfo.UserDefined, crypto.SSEIV)
+	delete(objInfo.UserDefined, crypto.SSESealAlgorithm)
+	delete(objInfo.UserDefined, crypto.SSECSealedKey)
+	delete(objInfo.UserDefined, crypto.SSEMultipart)
 
+	if crypto.S3.IsEncrypted(objInfo.UserDefined) {
+		delete(objInfo.UserDefined, crypto.S3SealedKey)
+		delete(objInfo.UserDefined, crypto.S3KMSKeyID)
+		delete(objInfo.UserDefined, crypto.S3KMSSealedKey)
+	}
 	if w.copySource {
-		w.customerKeyHeader = r.Header.Get(SSECopyCustomerKey)
+		w.customerKeyHeader = r.Header.Get(crypto.SSECopyKey)
 	}
 
-	if err := w.buildDecrypter(partStartIndex + 1); err != nil {
+	if err := w.buildDecrypter(w.parts[w.partIndex].Number); err != nil {
 		return nil, 0, 0, err
 	}
 
 	return w, encStartOffset, encLength, nil
 }
 
-// getEncryptedStartOffset - fetch sequence number, encrypted start offset and encrypted length.
-func getEncryptedStartOffset(offset, length int64) (seqNumber uint32, encOffset int64, encLength int64) {
+// getEncryptedMultipartsOffsetLength - fetch sequence number, encrypted start offset and encrypted length.
+func getEncryptedMultipartsOffsetLength(offset, length int64, obj ObjectInfo) (uint32, int64, int64) {
+
+	// Calculate encrypted offset of a multipart object
+	computeEncOffset := func(off int64, obj ObjectInfo) (seqNumber uint32, encryptedOffset int64, err error) {
+		var curPartEndOffset uint64
+		var prevPartsEncSize int64
+		for _, p := range obj.Parts {
+			size, decErr := sio.DecryptedSize(uint64(p.Size))
+			if decErr != nil {
+				err = errObjectTampered // assign correct error type
+				return
+			}
+			if off < int64(curPartEndOffset+size) {
+				seqNumber, encryptedOffset, _ = getEncryptedSinglePartOffsetLength(off-int64(curPartEndOffset), 1, obj)
+				encryptedOffset += int64(prevPartsEncSize)
+				break
+			}
+			curPartEndOffset += size
+			prevPartsEncSize += p.Size
+		}
+		return
+	}
+
+	// Calculate the encrypted start offset corresponding to the plain offset
+	seqNumber, encStartOffset, _ := computeEncOffset(offset, obj)
+	// Calculate also the encrypted end offset corresponding to plain offset + plain length
+	_, encEndOffset, _ := computeEncOffset(offset+length-1, obj)
+
+	// encLength is the diff between encrypted end offset and encrypted start offset + one package size
+	// to ensure all encrypted data are covered
+	encLength := encEndOffset - encStartOffset + (64*1024 + 32)
+
+	// Calculate total size of all parts
+	var totalPartsLength int64
+	for _, p := range obj.Parts {
+		totalPartsLength += p.Size
+	}
+
+	// Set encLength to maximum possible value if it exceeded total parts size
+	if encLength+encStartOffset > totalPartsLength {
+		encLength = totalPartsLength - encStartOffset
+	}
+
+	return seqNumber, encStartOffset, encLength
+}
+
+// getEncryptedSinglePartOffsetLength - fetch sequence number, encrypted start offset and encrypted length.
+func getEncryptedSinglePartOffsetLength(offset, length int64, objInfo ObjectInfo) (seqNumber uint32, encOffset int64, encLength int64) {
 	onePkgSize := int64(sseDAREPackageBlockSize + sseDAREPackageMetaSize)
 
 	seqNumber = uint32(offset / sseDAREPackageBlockSize)
@@ -702,55 +631,36 @@ func getEncryptedStartOffset(offset, length int64) (seqNumber uint32, encOffset
 		encLength += onePkgSize
 	}
 
+	if encLength+encOffset > objInfo.EncryptedSize() {
+		encLength = objInfo.EncryptedSize() - encOffset
+	}
 	return seqNumber, encOffset, encLength
 }
 
-// IsEncryptedMultipart - is the encrypted content multiparted?
-func (o *ObjectInfo) IsEncryptedMultipart() bool {
-	_, ok := o.UserDefined[ReservedMetadataPrefix+"Encrypted-Multipart"]
-	return ok
-}
-
-// IsEncrypted returns true if the object is marked as encrypted.
-func (o *ObjectInfo) IsEncrypted() bool {
-	if _, ok := o.UserDefined[ServerSideEncryptionIV]; ok {
-		return true
-	}
-	if _, ok := o.UserDefined[ServerSideEncryptionSealAlgorithm]; ok {
-		return true
-	}
-	if _, ok := o.UserDefined[ServerSideEncryptionSealedKey]; ok {
-		return true
-	}
-	return false
-}
-
-// IsEncrypted returns true if the object is marked as encrypted.
-func (li *ListPartsInfo) IsEncrypted() bool {
-	if _, ok := li.UserDefined[ServerSideEncryptionIV]; ok {
-		return true
-	}
-	if _, ok := li.UserDefined[ServerSideEncryptionSealAlgorithm]; ok {
-		return true
-	}
-	if _, ok := li.UserDefined[ServerSideEncryptionSealedKey]; ok {
-		return true
-	}
-	return false
-}
-
 // DecryptedSize returns the size of the object after decryption in bytes.
 // It returns an error if the object is not encrypted or marked as encrypted
 // but has an invalid size.
 func (o *ObjectInfo) DecryptedSize() (int64, error) {
-	if !o.IsEncrypted() {
+	if !crypto.IsEncrypted(o.UserDefined) {
 		return 0, errors.New("Cannot compute decrypted size of an unencrypted object")
 	}
-	size, err := sio.DecryptedSize(uint64(o.Size))
-	if err != nil {
-		err = errObjectTampered // assign correct error type
+	if len(o.Parts) == 0 || !crypto.IsMultiPart(o.UserDefined) {
+		size, err := sio.DecryptedSize(uint64(o.Size))
+		if err != nil {
+			err = errObjectTampered // assign correct error type
+		}
+		return int64(size), err
 	}
-	return int64(size), err
+
+	var size int64
+	for _, part := range o.Parts {
+		partSize, err := sio.DecryptedSize(uint64(part.Size))
+		if err != nil {
+			return 0, errObjectTampered
+		}
+		size += int64(partSize)
+	}
+	return size, nil
 }
 
 // EncryptedSize returns the size of the object after encryption.
@@ -780,10 +690,11 @@ func DecryptCopyObjectInfo(info *ObjectInfo, headers http.Header) (apiErr APIErr
 	if info.IsDir {
 		return ErrNone, false
 	}
-	if apiErr, encrypted = ErrNone, info.IsEncrypted(); !encrypted && hasSSECopyCustomerHeader(headers) {
+	if apiErr, encrypted = ErrNone, crypto.IsEncrypted(info.UserDefined); !encrypted && crypto.SSECopy.IsRequested(headers) {
 		apiErr = ErrInvalidEncryptionParameters
 	} else if encrypted {
-		if !hasSSECopyCustomerHeader(headers) {
+		if (!crypto.SSECopy.IsRequested(headers) && crypto.SSEC.IsEncrypted(info.UserDefined)) ||
+			(crypto.SSECopy.IsRequested(headers) && crypto.S3.IsEncrypted(info.UserDefined)) {
 			apiErr = ErrSSEEncryptedObject
 			return
 		}
@@ -807,10 +718,16 @@ func DecryptObjectInfo(info *ObjectInfo, headers http.Header) (apiErr APIErrorCo
 	if info.IsDir {
 		return ErrNone, false
 	}
-	if apiErr, encrypted = ErrNone, info.IsEncrypted(); !encrypted && hasSSECustomerHeader(headers) {
+	// disallow X-Amz-Server-Side-Encryption header on HEAD and GET
+	if crypto.S3.IsRequested(headers) {
+		apiErr = ErrInvalidEncryptionParameters
+		return
+	}
+	if apiErr, encrypted = ErrNone, crypto.IsEncrypted(info.UserDefined); !encrypted && crypto.SSEC.IsRequested(headers) {
 		apiErr = ErrInvalidEncryptionParameters
 	} else if encrypted {
-		if !hasSSECustomerHeader(headers) {
+		if (crypto.SSEC.IsEncrypted(info.UserDefined) && !crypto.SSEC.IsRequested(headers)) ||
+			(crypto.S3.IsEncrypted(info.UserDefined) && crypto.SSEC.IsRequested(headers)) {
 			apiErr = ErrSSEEncryptedObject
 			return
 		}

cmd/encryption-v1_test.go

@@ -18,21 +18,52 @@ package cmd
 
 import (
 	"bytes"
+	"encoding/base64"
 	"net/http"
 	"testing"
+
+	"github.com/minio/minio/cmd/crypto"
 )
 
+var hasServerSideEncryptionHeaderTests = []struct {
+	headers    map[string]string
+	sseRequest bool
+}{
+	{headers: map[string]string{crypto.SSECAlgorithm: "AES256", crypto.SSECKey: "key", crypto.SSECKeyMD5: "md5"}, sseRequest: true},                             // 0
+	{headers: map[string]string{crypto.SSECAlgorithm: "AES256"}, sseRequest: true},                                                                              // 1
+	{headers: map[string]string{crypto.SSECKey: "key"}, sseRequest: true},                                                                                       // 2
+	{headers: map[string]string{crypto.SSECKeyMD5: "md5"}, sseRequest: true},                                                                                    // 3
+	{headers: map[string]string{}, sseRequest: false},                                                                                                           // 4
+	{headers: map[string]string{crypto.SSECopyAlgorithm + " ": "AES256", " " + crypto.SSECopyKey: "key", crypto.SSECopyKeyMD5 + " ": "md5"}, sseRequest: false}, // 5
+	{headers: map[string]string{crypto.SSECopyAlgorithm: "", crypto.SSECopyKey: "", crypto.SSECopyKeyMD5: ""}, sseRequest: false},                               // 6
+	{headers: map[string]string{crypto.SSEHeader: ""}, sseRequest: true},                                                                                        // 6
+}
+
+func TestHasServerSideEncryptionHeader(t *testing.T) {
+	for i, test := range hasServerSideEncryptionHeaderTests {
+		headers := http.Header{}
+		for k, v := range test.headers {
+			headers.Set(k, v)
+		}
+		if hasServerSideEncryptionHeader(headers) != test.sseRequest {
+			t.Errorf("Test %d: Expected hasServerSideEncryptionHeader to return %v", i, test.sseRequest)
+		}
+	}
+}
+
 var hasSSECopyCustomerHeaderTests = []struct {
 	headers    map[string]string
 	sseRequest bool
 }{
-	{headers: map[string]string{SSECopyCustomerAlgorithm: "AES256", SSECopyCustomerKey: "key", SSECopyCustomerKeyMD5: "md5"}, sseRequest: true},                    // 0
-	{headers: map[string]string{SSECopyCustomerAlgorithm: "AES256"}, sseRequest: true},                                                                             // 1
-	{headers: map[string]string{SSECopyCustomerKey: "key"}, sseRequest: true},                                                                                      // 2
-	{headers: map[string]string{SSECopyCustomerKeyMD5: "md5"}, sseRequest: true},                                                                                   // 3
-	{headers: map[string]string{}, sseRequest: false},                                                                                                              // 4
-	{headers: map[string]string{SSECopyCustomerAlgorithm + " ": "AES256", " " + SSECopyCustomerKey: "key", SSECopyCustomerKeyMD5 + " ": "md5"}, sseRequest: false}, // 5
-	{headers: map[string]string{SSECopyCustomerAlgorithm: "", SSECopyCustomerKey: "", SSECopyCustomerKeyMD5: ""}, sseRequest: false},                               // 6
+	{headers: map[string]string{crypto.SSECopyAlgorithm: "AES256", crypto.SSECopyKey: "key", crypto.SSECopyKeyMD5: "md5"}, sseRequest: true},                    // 0
+	{headers: map[string]string{crypto.SSECopyAlgorithm: "AES256"}, sseRequest: true},                                                                           // 1
+	{headers: map[string]string{crypto.SSECopyKey: "key"}, sseRequest: true},                                                                                    // 2
+	{headers: map[string]string{crypto.SSECopyKeyMD5: "md5"}, sseRequest: true},                                                                                 // 3
+	{headers: map[string]string{}, sseRequest: false},                                                                                                           // 4
+	{headers: map[string]string{crypto.SSECopyAlgorithm + " ": "AES256", " " + crypto.SSECopyKey: "key", crypto.SSECopyKeyMD5 + " ": "md5"}, sseRequest: false}, // 5
+	{headers: map[string]string{crypto.SSECopyAlgorithm: "", crypto.SSECopyKey: "", crypto.SSECopyKeyMD5: ""}, sseRequest: true},                                // 6
+	{headers: map[string]string{crypto.SSEHeader: ""}, sseRequest: false},                                                                                       // 7
+
 }
 
 func TestIsSSECopyCustomerRequest(t *testing.T) {
@@ -41,8 +72,8 @@ func TestIsSSECopyCustomerRequest(t *testing.T) {
 		for k, v := range test.headers {
 			headers.Set(k, v)
 		}
-		if hasSSECopyCustomerHeader(headers) != test.sseRequest {
-			t.Errorf("Test %d: Expected hasSSECopyCustomerHeader to return %v", i, test.sseRequest)
+		if crypto.SSECopy.IsRequested(headers) != test.sseRequest {
+			t.Errorf("Test %d: Expected crypto.SSECopy.IsRequested to return %v", i, test.sseRequest)
 		}
 	}
 }
@@ -51,13 +82,15 @@ var hasSSECustomerHeaderTests = []struct {
 	headers    map[string]string
 	sseRequest bool
 }{
-	{headers: map[string]string{SSECustomerAlgorithm: "AES256", SSECustomerKey: "key", SSECustomerKeyMD5: "md5"}, sseRequest: true},                    // 0
-	{headers: map[string]string{SSECustomerAlgorithm: "AES256"}, sseRequest: true},                                                                     // 1
-	{headers: map[string]string{SSECustomerKey: "key"}, sseRequest: true},                                                                              // 2
-	{headers: map[string]string{SSECustomerKeyMD5: "md5"}, sseRequest: true},                                                                           // 3
+	{headers: map[string]string{crypto.SSECAlgorithm: "AES256", crypto.SSECKey: "key", crypto.SSECKeyMD5: "md5"}, sseRequest: true},                    // 0
+	{headers: map[string]string{crypto.SSECAlgorithm: "AES256"}, sseRequest: true},                                                                     // 1
+	{headers: map[string]string{crypto.SSECKey: "key"}, sseRequest: true},                                                                              // 2
+	{headers: map[string]string{crypto.SSECKeyMD5: "md5"}, sseRequest: true},                                                                           // 3
 	{headers: map[string]string{}, sseRequest: false},                                                                                                  // 4
-	{headers: map[string]string{SSECustomerAlgorithm + " ": "AES256", " " + SSECustomerKey: "key", SSECustomerKeyMD5 + " ": "md5"}, sseRequest: false}, // 5
-	{headers: map[string]string{SSECustomerAlgorithm: "", SSECustomerKey: "", SSECustomerKeyMD5: ""}, sseRequest: false},                               // 6
+	{headers: map[string]string{crypto.SSECAlgorithm + " ": "AES256", " " + crypto.SSECKey: "key", crypto.SSECKeyMD5 + " ": "md5"}, sseRequest: false}, // 5
+	{headers: map[string]string{crypto.SSECAlgorithm: "", crypto.SSECKey: "", crypto.SSECKeyMD5: ""}, sseRequest: false},                               // 6
+	{headers: map[string]string{crypto.SSEHeader: ""}, sseRequest: false},                                                                              // 7
+
 }
 
 func TesthasSSECustomerHeader(t *testing.T) {
@@ -66,7 +99,7 @@ func TesthasSSECustomerHeader(t *testing.T) {
 		for k, v := range test.headers {
 			headers.Set(k, v)
 		}
-		if hasSSECustomerHeader(headers) != test.sseRequest {
+		if crypto.SSEC.IsRequested(headers) != test.sseRequest {
 			t.Errorf("Test %d: Expected hasSSECustomerHeader to return %v", i, test.sseRequest)
 		}
 	}
@@ -79,75 +112,84 @@ var parseSSECustomerRequestTests = []struct {
 }{
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 0
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 0
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
 		useTLS: true, err: nil,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 1
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 1
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
 		useTLS: false, err: errInsecureSSERequest,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES 256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 2
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES 256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 2
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
-		useTLS: true, err: errInvalidSSEAlgorithm,
+		useTLS: true, err: crypto.ErrInvalidCustomerAlgorithm,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 3
-			SSECustomerKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 3
+			crypto.SSECKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
 		},
-		useTLS: true, err: errSSEKeyMD5Mismatch,
+		useTLS: true, err: crypto.ErrCustomerKeyMD5Mismatch,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       " jE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 4
-			SSECustomerKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       " jE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 4
+			crypto.SSECKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
 		},
-		useTLS: true, err: errInvalidSSEKey,
+		useTLS: true, err: crypto.ErrInvalidCustomerKey,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 5
-			SSECustomerKeyMD5:    " +jq/LwEOEO90YtiTuNFVw==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 5
+			crypto.SSECKeyMD5:    " +jq/LwEOEO90YtiTuNFVw==",
 		},
-		useTLS: true, err: errSSEKeyMD5Mismatch,
+		useTLS: true, err: crypto.ErrCustomerKeyMD5Mismatch,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 6
-			SSECustomerKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 6
+			crypto.SSECKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
 		},
-		useTLS: true, err: errInvalidSSEKey,
+		useTLS: true, err: crypto.ErrInvalidCustomerKey,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "", // 7
-			SSECustomerKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "", // 7
+			crypto.SSECKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
 		},
-		useTLS: true, err: errMissingSSEKey,
+		useTLS: true, err: crypto.ErrMissingCustomerKey,
 	},
 	{
 		headers: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 8
-			SSECustomerKeyMD5:    "",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 8
+			crypto.SSECKeyMD5:    "",
 		},
-		useTLS: true, err: errMissingSSEKeyMD5,
+		useTLS: true, err: crypto.ErrMissingCustomerKeyMD5,
+	},
+	{
+		headers: map[string]string{
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 8
+			crypto.SSECKeyMD5:    "",
+			crypto.SSEHeader:     "",
+		},
+		useTLS: true, err: crypto.ErrIncompatibleEncryptionMethod,
 	},
 }
 
@@ -166,8 +208,8 @@ func TestParseSSECustomerRequest(t *testing.T) {
 		if err != test.err {
 			t.Errorf("Test %d: Parse returned: %v want: %v", i, err, test.err)
 		}
-		key := request.Header.Get(SSECustomerKey)
-		if (err == nil || err == errSSEKeyMD5Mismatch) && key != "" {
+		key := request.Header.Get(crypto.SSECKey)
+		if (err == nil || err == crypto.ErrCustomerKeyMD5Mismatch) && key != "" {
 			t.Errorf("Test %d: Client key survived parsing - found key: %v", i, key)
 		}
 
@@ -175,81 +217,100 @@ func TestParseSSECustomerRequest(t *testing.T) {
 }
 
 var parseSSECopyCustomerRequestTests = []struct {
-	headers map[string]string
-	useTLS  bool
-	err     error
+	headers  map[string]string
+	metadata map[string]string
+	useTLS   bool
+	err      error
 }{
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 0
-			SSECopyCustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 0
+			crypto.SSECopyKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
-		useTLS: true, err: nil,
+		metadata: map[string]string{},
+		useTLS:   true, err: nil,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 1
-			SSECopyCustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 0
+			crypto.SSECopyKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
-		useTLS: false, err: errInsecureSSERequest,
+		metadata: map[string]string{"X-Minio-Internal-Server-Side-Encryption-S3-Sealed-Key": base64.StdEncoding.EncodeToString(make([]byte, 64))},
+		useTLS:   true, err: crypto.ErrIncompatibleEncryptionMethod,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES 256",
-			SSECopyCustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 2
-			SSECopyCustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 1
+			crypto.SSECopyKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
-		useTLS: true, err: errInvalidSSEAlgorithm,
+		metadata: map[string]string{},
+		useTLS:   false, err: errInsecureSSERequest,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 3
-			SSECopyCustomerKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
+			crypto.SSECopyAlgorithm: "AES 256",
+			crypto.SSECopyKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=", // 2
+			crypto.SSECopyKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
-		useTLS: true, err: errSSEKeyMD5Mismatch,
+		metadata: map[string]string{},
+		useTLS:   true, err: crypto.ErrInvalidCustomerAlgorithm,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       " jE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 4
-			SSECopyCustomerKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 3
+			crypto.SSECopyKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
 		},
-		useTLS: true, err: errInvalidSSEKey,
+		metadata: map[string]string{},
+		useTLS:   true, err: crypto.ErrCustomerKeyMD5Mismatch,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 5
-			SSECopyCustomerKeyMD5:    " +jq/LwEOEO90YtiTuNFVw==",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       " jE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 4
+			crypto.SSECopyKeyMD5:    "H+jq/LwEOEO90YtiTuNFVw==",
 		},
-		useTLS: true, err: errSSEKeyMD5Mismatch,
+		metadata: map[string]string{},
+		useTLS:   true, err: crypto.ErrInvalidCustomerKey,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 6
-			SSECopyCustomerKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "NjE0SL87s+ZhYtaTrg5eI5cjhCQLGPVMKenPG2bCJFw=", // 5
+			crypto.SSECopyKeyMD5:    " +jq/LwEOEO90YtiTuNFVw==",
 		},
-		useTLS: true, err: errInvalidSSEKey,
+		metadata: map[string]string{},
+		useTLS:   true, err: crypto.ErrCustomerKeyMD5Mismatch,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       "", // 7
-			SSECopyCustomerKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 6
+			crypto.SSECopyKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
 		},
-		useTLS: true, err: errMissingSSEKey,
+		metadata: map[string]string{},
+		useTLS:   true, err: crypto.ErrInvalidCustomerKey,
 	},
 	{
 		headers: map[string]string{
-			SSECopyCustomerAlgorithm: "AES256",
-			SSECopyCustomerKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 8
-			SSECopyCustomerKeyMD5:    "",
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "", // 7
+			crypto.SSECopyKeyMD5:    "9KPgDdZNTHimuYCwnJTp5g==",
 		},
-		useTLS: true, err: errMissingSSEKeyMD5,
+		metadata: map[string]string{},
+		useTLS:   true, err: crypto.ErrMissingCustomerKey,
+	},
+	{
+		headers: map[string]string{
+			crypto.SSECopyAlgorithm: "AES256",
+			crypto.SSECopyKey:       "vFQ9ScFOF6Tu/BfzMS+rVMvlZGJHi5HmGJenJfrfKI45", // 8
+			crypto.SSECopyKeyMD5:    "",
+		},
+		metadata: map[string]string{},
+		useTLS:   true, err: crypto.ErrMissingCustomerKeyMD5,
 	},
 }
 
@@ -264,12 +325,12 @@ func TestParseSSECopyCustomerRequest(t *testing.T) {
 		request.Header = headers
 		globalIsSSL = test.useTLS
 
-		_, err := ParseSSECopyCustomerRequest(request)
+		_, err := ParseSSECopyCustomerRequest(request, test.metadata)
 		if err != test.err {
 			t.Errorf("Test %d: Parse returned: %v want: %v", i, err, test.err)
 		}
-		key := request.Header.Get(SSECopyCustomerKey)
-		if (err == nil || err == errSSEKeyMD5Mismatch) && key != "" {
+		key := request.Header.Get(crypto.SSECopyKey)
+		if (err == nil || err == crypto.ErrCustomerKeyMD5Mismatch) && key != "" {
 			t.Errorf("Test %d: Client key survived parsing - found key: %v", i, key)
 		}
 	}
@@ -281,20 +342,20 @@ var encryptRequestTests = []struct {
 }{
 	{
 		header: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
 		metadata: map[string]string{},
 	},
 	{
 		header: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
 		metadata: map[string]string{
-			SSECustomerKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECKey: "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
 		},
 	},
 }
@@ -308,79 +369,119 @@ func TestEncryptRequest(t *testing.T) {
 		for k, v := range test.header {
 			req.Header.Set(k, v)
 		}
-		_, err := EncryptRequest(content, req, test.metadata)
+		_, err := EncryptRequest(content, req, "bucket", "object", test.metadata)
+
 		if err != nil {
 			t.Fatalf("Test %d: Failed to encrypt request: %v", i, err)
 		}
-		if key, ok := test.metadata[SSECustomerKey]; ok {
+		if key, ok := test.metadata[crypto.SSECKey]; ok {
 			t.Errorf("Test %d: Client provided key survived in metadata - key: %s", i, key)
 		}
-		if kdf, ok := test.metadata[ServerSideEncryptionSealAlgorithm]; !ok {
+		if kdf, ok := test.metadata[crypto.SSESealAlgorithm]; !ok {
 			t.Errorf("Test %d: ServerSideEncryptionKDF must be part of metadata: %v", i, kdf)
 		}
-		if iv, ok := test.metadata[ServerSideEncryptionIV]; !ok {
-			t.Errorf("Test %d: ServerSideEncryptionIV must be part of metadata: %v", i, iv)
+		if iv, ok := test.metadata[crypto.SSEIV]; !ok {
+			t.Errorf("Test %d: crypto.SSEIV must be part of metadata: %v", i, iv)
 		}
-		if mac, ok := test.metadata[ServerSideEncryptionSealedKey]; !ok {
+		if mac, ok := test.metadata[crypto.SSECSealedKey]; !ok {
 			t.Errorf("Test %d: ServerSideEncryptionKeyMAC must be part of metadata: %v", i, mac)
 		}
 	}
 }
 
 var decryptRequestTests = []struct {
-	header     map[string]string
-	metadata   map[string]string
-	shouldFail bool
+	bucket, object string
+	header         map[string]string
+	metadata       map[string]string
+	shouldFail     bool
 }{
 	{
+		bucket: "bucket",
+		object: "object",
 		header: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=",
-			SSECustomerKeyMD5:    "7PpPLAK26ONlVUGOWlusfg==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=",
+			crypto.SSECKeyMD5:    "7PpPLAK26ONlVUGOWlusfg==",
 		},
 		metadata: map[string]string{
-			ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256,
-			ServerSideEncryptionIV:            "7nQqotA8xgrPx6QK7Ap3GCfjKitqJSrGP7xzgErSJlw=",
-			ServerSideEncryptionSealedKey:     "EAAfAAAAAAD7v1hQq3PFRUHsItalxmrJqrOq6FwnbXNarxOOpb8jTWONPPKyM3Gfjkjyj6NCf+aB/VpHCLCTBA==",
+			crypto.SSESealAlgorithm: SSESealAlgorithmDareSha256,
+			crypto.SSEIV:            "7nQqotA8xgrPx6QK7Ap3GCfjKitqJSrGP7xzgErSJlw=",
+			crypto.SSECSealedKey:    "EAAfAAAAAAD7v1hQq3PFRUHsItalxmrJqrOq6FwnbXNarxOOpb8jTWONPPKyM3Gfjkjyj6NCf+aB/VpHCLCTBA==",
 		},
 		shouldFail: false,
 	},
 	{
+		bucket: "bucket",
+		object: "object",
 		header: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=",
+			crypto.SSECKeyMD5:    "7PpPLAK26ONlVUGOWlusfg==",
 		},
 		metadata: map[string]string{
-			ServerSideEncryptionSealAlgorithm: "HMAC-SHA3",
-			ServerSideEncryptionIV:            "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
-			ServerSideEncryptionSealedKey:     "SY5E9AvI2tI7/nUrUAssIGE32Hcs4rR9z/CUuPqu5N4=",
+			crypto.SSESealAlgorithm: SSESealAlgorithmDareV2HmacSha256,
+			crypto.SSEIV:            "qEqmsONcorqlcZXJxaw32H04eyXyXwUgjHzlhkaIYrU=",
+			crypto.SSECSealedKey:    "IAAfAIM14ugTGcM/dIrn4iQMrkl1sjKyeBQ8FBEvRebYj8vWvxG+0cJRpC6NXRU1wJN50JaUOATjO7kz0wZ2mA==",
+		},
+		shouldFail: false,
+	},
+	{
+		bucket: "bucket",
+		object: "object",
+		header: map[string]string{
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+		},
+		metadata: map[string]string{
+			crypto.SSESealAlgorithm: "HMAC-SHA3",
+			crypto.SSEIV:            "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECSealedKey:    "SY5E9AvI2tI7/nUrUAssIGE32Hcs4rR9z/CUuPqu5N4=",
 		},
 		shouldFail: true,
 	},
 	{
+		bucket: "bucket",
+		object: "object",
 		header: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
 		metadata: map[string]string{
-			ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256,
-			ServerSideEncryptionIV:            "RrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
-			ServerSideEncryptionSealedKey:     "SY5E9AvI2tI7/nUrUAssIGE32Hcs4rR9z/CUuPqu5N4=",
+			crypto.SSESealAlgorithm: SSESealAlgorithmDareSha256,
+			crypto.SSEIV:            "RrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECSealedKey:    "SY5E9AvI2tI7/nUrUAssIGE32Hcs4rR9z/CUuPqu5N4=",
 		},
 		shouldFail: true,
 	},
 	{
+		bucket: "bucket",
+		object: "object",
 		header: map[string]string{
-			SSECustomerAlgorithm: "AES256",
-			SSECustomerKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
-			SSECustomerKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "XAm0dRrJsEsyPb1UuFNezv1bl9hxuYsgUVC/MUctE2k=",
+			crypto.SSECKeyMD5:    "bY4wkxQejw9mUJfo72k53A==",
 		},
 		metadata: map[string]string{
-			ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256,
-			ServerSideEncryptionIV:            "XAm0dRrJsEsyPb1UuFNezv1bl9ehxuYsgUVC/MUctE2k=",
-			ServerSideEncryptionSealedKey:     "SY5E9AvI2tI7/nUrUAssIGE32Hds4rR9z/CUuPqu5N4=",
+			crypto.SSESealAlgorithm: SSESealAlgorithmDareSha256,
+			crypto.SSEIV:            "XAm0dRrJsEsyPb1UuFNezv1bl9ehxuYsgUVC/MUctE2k=",
+			crypto.SSECSealedKey:    "SY5E9AvI2tI7/nUrUAssIGE32Hds4rR9z/CUuPqu5N4=",
+		},
+		shouldFail: true,
+	},
+	{
+		bucket: "bucket",
+		object: "object-2",
+		header: map[string]string{
+			crypto.SSECAlgorithm: "AES256",
+			crypto.SSECKey:       "MzJieXRlc2xvbmdzZWNyZXRrZXltdXN0cHJvdmlkZWQ=",
+			crypto.SSECKeyMD5:    "7PpPLAK26ONlVUGOWlusfg==",
+		},
+		metadata: map[string]string{
+			crypto.SSESealAlgorithm: SSESealAlgorithmDareV2HmacSha256,
+			crypto.SSEIV:            "qEqmsONcorqlcZXJxaw32H04eyXyXwUgjHzlhkaIYrU=",
+			crypto.SSECSealedKey:    "IAAfAIM14ugTGcM/dIrn4iQMrkl1sjKyeBQ8FBEvRebYj8vWvxG+0cJRpC6NXRU1wJN50JaUOATjO7kz0wZ2mA==",
 		},
 		shouldFail: true,
 	},
@@ -389,26 +490,29 @@ var decryptRequestTests = []struct {
 func TestDecryptRequest(t *testing.T) {
 	defer func(flag bool) { globalIsSSL = flag }(globalIsSSL)
 	globalIsSSL = true
-	for i, test := range decryptRequestTests {
+	for i, test := range decryptRequestTests[1:] {
 		client := bytes.NewBuffer(nil)
 		req := &http.Request{Header: http.Header{}}
 		for k, v := range test.header {
 			req.Header.Set(k, v)
 		}
-		_, err := DecryptRequest(client, req, test.metadata)
+		_, err := DecryptRequest(client, req, test.bucket, test.object, test.metadata)
 		if err != nil && !test.shouldFail {
 			t.Fatalf("Test %d: Failed to encrypt request: %v", i, err)
 		}
-		if key, ok := test.metadata[SSECustomerKey]; ok {
+		if err == nil && test.shouldFail {
+			t.Fatalf("Test %d: should fail but passed", i)
+		}
+		if key, ok := test.metadata[crypto.SSECKey]; ok {
 			t.Errorf("Test %d: Client provided key survived in metadata - key: %s", i, key)
 		}
-		if kdf, ok := test.metadata[ServerSideEncryptionSealAlgorithm]; ok && !test.shouldFail {
+		if kdf, ok := test.metadata[crypto.SSESealAlgorithm]; ok && !test.shouldFail {
 			t.Errorf("Test %d: ServerSideEncryptionKDF should not be part of metadata: %v", i, kdf)
 		}
-		if iv, ok := test.metadata[ServerSideEncryptionIV]; ok && !test.shouldFail {
-			t.Errorf("Test %d: ServerSideEncryptionIV should not be part of metadata: %v", i, iv)
+		if iv, ok := test.metadata[crypto.SSEIV]; ok && !test.shouldFail {
+			t.Errorf("Test %d: crypto.SSEIV should not be part of metadata: %v", i, iv)
 		}
-		if mac, ok := test.metadata[ServerSideEncryptionSealedKey]; ok && !test.shouldFail {
+		if mac, ok := test.metadata[crypto.SSECSealedKey]; ok && !test.shouldFail {
 			t.Errorf("Test %d: ServerSideEncryptionKeyMAC should not be part of metadata: %v", i, mac)
 		}
 	}
@@ -425,28 +529,28 @@ var decryptObjectInfoTests = []struct {
 		expErr:  ErrNone,
 	},
 	{
-		info:    ObjectInfo{Size: 100, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
-		headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
+		info:    ObjectInfo{Size: 100, UserDefined: map[string]string{crypto.SSESealAlgorithm: SSESealAlgorithmDareSha256}},
+		headers: http.Header{crypto.SSECAlgorithm: []string{crypto.SSEAlgorithmAES256}},
 		expErr:  ErrNone,
 	},
 	{
-		info:    ObjectInfo{Size: 0, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
-		headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
+		info:    ObjectInfo{Size: 0, UserDefined: map[string]string{crypto.SSESealAlgorithm: SSESealAlgorithmDareSha256}},
+		headers: http.Header{crypto.SSECAlgorithm: []string{crypto.SSEAlgorithmAES256}},
 		expErr:  ErrNone,
 	},
 	{
-		info:    ObjectInfo{Size: 100, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
+		info:    ObjectInfo{Size: 100, UserDefined: map[string]string{crypto.SSECSealedKey: "EAAfAAAAAAD7v1hQq3PFRUHsItalxmrJqrOq6FwnbXNarxOOpb8jTWONPPKyM3Gfjkjyj6NCf+aB/VpHCLCTBA=="}},
 		headers: http.Header{},
 		expErr:  ErrSSEEncryptedObject,
 	},
 	{
 		info:    ObjectInfo{Size: 100, UserDefined: map[string]string{}},
-		headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
+		headers: http.Header{crypto.SSECAlgorithm: []string{crypto.SSEAlgorithmAES256}},
 		expErr:  ErrInvalidEncryptionParameters,
 	},
 	{
-		info:    ObjectInfo{Size: 31, UserDefined: map[string]string{ServerSideEncryptionSealAlgorithm: SSESealAlgorithmDareSha256}},
-		headers: http.Header{SSECustomerAlgorithm: []string{SSECustomerAlgorithmAES256}},
+		info:    ObjectInfo{Size: 31, UserDefined: map[string]string{crypto.SSESealAlgorithm: SSESealAlgorithmDareSha256}},
+		headers: http.Header{crypto.SSECAlgorithm: []string{crypto.SSEAlgorithmAES256}},
 		expErr:  ErrObjectTampered,
 	},
 }
@@ -455,7 +559,7 @@ func TestDecryptObjectInfo(t *testing.T) {
 	for i, test := range decryptObjectInfoTests {
 		if err, encrypted := DecryptObjectInfo(&test.info, test.headers); err != test.expErr {
 			t.Errorf("Test %d: Decryption returned wrong error code: got %d , want %d", i, err, test.expErr)
-		} else if enc := test.info.IsEncrypted(); encrypted && enc != encrypted {
+		} else if enc := crypto.IsEncrypted(test.info.UserDefined); encrypted && enc != encrypted {
 			t.Errorf("Test %d: Decryption thinks object is encrypted but it is not", i)
 		} else if !encrypted && enc != encrypted {
 			t.Errorf("Test %d: Decryption thinks object is not encrypted but it is", i)

cmd/endpoint-ellipses.go

@@ -18,6 +18,8 @@ package cmd
 
 import (
 	"fmt"
+	"os"
+	"strconv"
 	"strings"
 
 	"github.com/minio/minio-go/pkg/set"
@@ -69,10 +71,26 @@ func getSetIndexes(args []string, totalSizes []uint64) (setIndexes [][]uint64, e
 		return nil, errInvalidArgument
 	}
 
+	// isValidSetSize - checks whether given count is a valid set size for erasure coding.
+	isValidSetSize := func(count uint64) bool {
+		return (count >= setSizes[0] && count <= setSizes[len(setSizes)-1] && count%2 == 0)
+	}
+
+	var customSetDriveCount uint64
+	if v := os.Getenv("MINIO_ERASURE_SET_DRIVE_COUNT"); v != "" {
+		customSetDriveCount, err = strconv.ParseUint(v, 10, 64)
+		if err != nil {
+			return nil, uiErrInvalidErasureSetSize(err)
+		}
+		if !isValidSetSize(customSetDriveCount) {
+			return nil, uiErrInvalidErasureSetSize(nil)
+		}
+	}
+
 	setIndexes = make([][]uint64, len(totalSizes))
 	for _, totalSize := range totalSizes {
 		// Check if totalSize has minimum range upto setSize
-		if totalSize < setSizes[0] {
+		if totalSize < setSizes[0] || totalSize < customSetDriveCount {
 			return nil, uiErrInvalidNumberOfErasureEndpoints(nil)
 		}
 	}
@@ -95,9 +113,24 @@ func getSetIndexes(args []string, totalSizes []uint64) (setIndexes [][]uint64, e
 		setSize = commonSize
 	}
 
-	// isValidSetSize - checks whether given count is a valid set size for erasure coding.
-	isValidSetSize := func(count uint64) bool {
-		return (count >= setSizes[0] && count <= setSizes[len(setSizes)-1] && count%2 == 0)
+	possibleSetCounts := func(setSize uint64) (ss []uint64) {
+		for _, s := range setSizes {
+			if setSize%s == 0 {
+				ss = append(ss, s)
+			}
+		}
+		return ss
+	}
+
+	if customSetDriveCount > 0 {
+		msg := fmt.Sprintf("Invalid set drive count, leads to non-uniform distribution for the given number of disks. Possible values for custom set count are %d", possibleSetCounts(setSize))
+		if customSetDriveCount > setSize {
+			return nil, uiErrInvalidErasureSetSize(nil).Msg(msg)
+		}
+		if setSize%customSetDriveCount != 0 {
+			return nil, uiErrInvalidErasureSetSize(nil).Msg(msg)
+		}
+		setSize = customSetDriveCount
 	}
 
 	// Check whether setSize is with the supported range.

cmd/endpoint-ellipses_test.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"fmt"
+	"os"
 	"reflect"
 	"testing"
 
@@ -84,6 +85,65 @@ func TestGetDivisibleSize(t *testing.T) {
 	}
 }
 
+// Test tests calculating set indexes with ENV override for drive count.
+func TestGetSetIndexesEnvOverride(t *testing.T) {
+	testCases := []struct {
+		args        []string
+		totalSizes  []uint64
+		indexes     [][]uint64
+		envOverride string
+		success     bool
+	}{
+		{
+			[]string{"data{1...64}"},
+			[]uint64{64},
+			[][]uint64{{8, 8, 8, 8, 8, 8, 8, 8}},
+			"8",
+			true,
+		},
+		{
+			[]string{"data{1...60}"},
+			nil,
+			nil,
+			"8",
+			false,
+		},
+		{
+			[]string{"data{1...64}"},
+			nil,
+			nil,
+			"-1",
+			false,
+		},
+		{
+			[]string{"data{1...64}"},
+			nil,
+			nil,
+			"2",
+			false,
+		},
+	}
+
+	for i, testCase := range testCases {
+		t.Run(fmt.Sprintf("Test%d", i+1), func(t *testing.T) {
+			if err := os.Setenv("MINIO_ERASURE_SET_DRIVE_COUNT", testCase.envOverride); err != nil {
+				t.Fatal(err)
+			}
+			gotIndexes, err := getSetIndexes(testCase.args, testCase.totalSizes)
+			if err != nil && testCase.success {
+				t.Errorf("Expected success but failed instead %s", err)
+			}
+			if err == nil && !testCase.success {
+				t.Errorf("Expected failure but passed instead")
+			}
+			if !reflect.DeepEqual(testCase.indexes, gotIndexes) {
+				t.Errorf("Expected %v, got %v", testCase.indexes, gotIndexes)
+			}
+			os.Unsetenv("MINIO_ERASURE_SET_DRIVE_COUNT")
+		})
+	}
+}
+
 // Test tests calculating set indexes.
 func TestGetSetIndexes(t *testing.T) {
 	testCases := []struct {

cmd/endpoint.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"net"
 	"net/url"
+	"os"
 	"path"
 	"path/filepath"
 	"runtime"
@@ -442,6 +443,8 @@ func CreateEndpoints(serverAddr string, args ...[]string) (string, EndpointList,
 		return serverAddr, endpoints, setupType, err
 	}
 
+	updateDomainIPs(uniqueArgs)
+
 	setupType = DistXLSetupType
 	return serverAddr, endpoints, setupType, nil
 }
@@ -493,3 +496,22 @@ func GetRemotePeers(endpoints EndpointList) []string {
 
 	return peerSet.ToSlice()
 }
+
+// In federated and distributed setup, update IP addresses of the hosts passed in command line
+// if MINIO_PUBLIC_IPS are not set manually
+func updateDomainIPs(endPoints set.StringSet) {
+	_, dok := os.LookupEnv("MINIO_DOMAIN")
+	_, eok := os.LookupEnv("MINIO_ETCD_ENDPOINTS")
+	_, iok := os.LookupEnv("MINIO_PUBLIC_IPS")
+	if dok && eok && !iok {
+		globalDomainIPs = set.NewStringSet()
+		for e := range endPoints {
+			host, _, _ := net.SplitHostPort(e)
+			ipList, _ := getHostIP4(host)
+			remoteIPList := ipList.FuncMatch(func(ip string, matchString string) bool {
+				return !strings.HasPrefix(ip, "127.")
+			}, "")
+			globalDomainIPs.Add(remoteIPList.ToSlice()[0])
+		}
+	}
+}

cmd/erasure-createfile.go

@@ -18,85 +18,92 @@ package cmd
 
 import (
 	"context"
-	"hash"
 	"io"
 
+	"sync"
+
 	"github.com/minio/minio/cmd/logger"
 )
 
-// CreateFile creates a new bitrot encoded file spread over all available disks. CreateFile will create
-// the file at the given volume and path. It will read from src until an io.EOF occurs. The given algorithm will
-// be used to protect the erasure encoded file.
-func (s *ErasureStorage) CreateFile(ctx context.Context, src io.Reader, volume, path string, buffer []byte, algorithm BitrotAlgorithm, writeQuorum int) (f ErasureFileInfo, err error) {
-	if !algorithm.Available() {
-		logger.LogIf(ctx, errBitrotHashAlgoInvalid)
-		return f, errBitrotHashAlgoInvalid
-	}
-	f.Checksums = make([][]byte, len(s.disks))
-	hashers := make([]hash.Hash, len(s.disks))
-	for i := range hashers {
-		hashers[i] = algorithm.New()
-	}
-	errChans, errs := make([]chan error, len(s.disks)), make([]error, len(s.disks))
-	for i := range errChans {
-		errChans[i] = make(chan error, 1) // create buffered channel to let finished go-routines die early
-	}
+// Writes in parallel to bitrotWriters
+type parallelWriter struct {
+	writers     []*bitrotWriter
+	writeQuorum int
+	errs        []error
+}
 
-	var blocks [][]byte
-	var n = len(buffer)
-	for n == len(buffer) {
-		n, err = io.ReadFull(src, buffer)
-		if n == 0 && err == io.EOF {
-			if f.Size != 0 { // don't write empty block if we have written to the disks
-				break
-			}
-			blocks = make([][]byte, len(s.disks)) // write empty block
-		} else if err == nil || (n > 0 && err == io.ErrUnexpectedEOF) {
-			blocks, err = s.ErasureEncode(ctx, buffer[:n])
-			if err != nil {
-				return f, err
-			}
-		} else {
-			logger.LogIf(ctx, err)
-			return f, err
-		}
+// Append appends data to bitrotWriters in parallel.
+func (p *parallelWriter) Append(ctx context.Context, blocks [][]byte) error {
+	var wg sync.WaitGroup
 
-		for i := range errChans { // span workers
-			go erasureAppendFile(ctx, s.disks[i], volume, path, hashers[i], blocks[i], errChans[i])
-		}
-		for i := range errChans { // wait until all workers are finished
-			errs[i] = <-errChans[i]
-		}
-		if err = reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum); err != nil {
-			return f, err
-		}
-		s.disks = evalDisks(s.disks, errs)
-		f.Size += int64(n)
-	}
-
-	f.Algorithm = algorithm
-	for i, disk := range s.disks {
-		if disk == OfflineDisk {
+	for i := range p.writers {
+		if p.writers[i] == nil {
+			p.errs[i] = errDiskNotFound
 			continue
 		}
-		f.Checksums[i] = hashers[i].Sum(nil)
+
+		wg.Add(1)
+		go func(i int) {
+			defer wg.Done()
+			p.errs[i] = p.writers[i].Append(blocks[i])
+			if p.errs[i] != nil {
+				p.writers[i] = nil
+			}
+		}(i)
 	}
-	return f, nil
+	wg.Wait()
+
+	// If nilCount >= p.writeQuorum, we return nil. This is because HealFile() uses
+	// CreateFile with p.writeQuorum=1 to accommodate healing of single disk.
+	// i.e if we do no return here in such a case, reduceWriteQuorumErrs() would
+	// return a quorum error to HealFile().
+	nilCount := 0
+	for _, err := range p.errs {
+		if err == nil {
+			nilCount++
+		}
+	}
+	if nilCount >= p.writeQuorum {
+		return nil
+	}
+	return reduceWriteQuorumErrs(ctx, p.errs, objectOpIgnoredErrs, p.writeQuorum)
 }
 
-// erasureAppendFile appends the content of buf to the file on the given disk and updates computes
-// the hash of the written data. It sends the write error (or nil) over the error channel.
-func erasureAppendFile(ctx context.Context, disk StorageAPI, volume, path string, hash hash.Hash, buf []byte, errChan chan<- error) {
-	if disk == OfflineDisk {
-		logger.LogIf(ctx, errDiskNotFound)
-		errChan <- errDiskNotFound
-		return
+// CreateFile reads from the reader, erasure-encodes the data and writes to the writers.
+func (s *ErasureStorage) CreateFile(ctx context.Context, src io.Reader, writers []*bitrotWriter, buf []byte, quorum int) (total int64, err error) {
+	writer := &parallelWriter{
+		writers:     writers,
+		writeQuorum: quorum,
+		errs:        make([]error, len(writers)),
 	}
-	err := disk.AppendFile(volume, path, buf)
-	if err != nil {
-		errChan <- err
-		return
+
+	for {
+		var blocks [][]byte
+		n, err := io.ReadFull(src, buf)
+		if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
+			logger.LogIf(ctx, err)
+			return 0, err
+		}
+		eof := err == io.EOF || err == io.ErrUnexpectedEOF
+		if n == 0 && total != 0 {
+			// Reached EOF, nothing more to be done.
+			break
+		}
+		// We take care of the situation where if n == 0 and total == 0 by creating empty data and parity files.
+		blocks, err = s.ErasureEncode(ctx, buf[:n])
+		if err != nil {
+			logger.LogIf(ctx, err)
+			return 0, err
+		}
+
+		if err = writer.Append(ctx, blocks); err != nil {
+			logger.LogIf(ctx, err)
+			return 0, err
+		}
+		total += int64(n)
+		if eof {
+			break
+		}
 	}
-	hash.Write(buf)
-	errChan <- err
+	return total, nil
 }

cmd/erasure-createfile_test.go

@@ -54,15 +54,14 @@ var erasureCreateFileTests = []struct {
 	{dataBlocks: 7, onDisks: 14, offDisks: 7, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true},                 // 9
 	{dataBlocks: 8, onDisks: 16, offDisks: 8, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true},                 // 10
 	{dataBlocks: 5, onDisks: 10, offDisks: 3, blocksize: int64(oneMiByte), data: oneMiByte, offset: 0, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                  // 11
-	{dataBlocks: 6, onDisks: 12, offDisks: 5, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 102, algorithm: 0, shouldFail: true, shouldFailQuorum: false},                                    // 12
-	{dataBlocks: 3, onDisks: 6, offDisks: 1, blocksize: int64(blockSizeV1), data: oneMiByte, offset: oneMiByte / 2, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},     // 13
-	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(oneMiByte / 2), data: oneMiByte, offset: oneMiByte/2 + 1, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 14
-	{dataBlocks: 4, onDisks: 8, offDisks: 0, blocksize: int64(oneMiByte - 1), data: oneMiByte, offset: oneMiByte - 1, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},               // 15
-	{dataBlocks: 8, onDisks: 12, offDisks: 2, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 2, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                // 16
-	{dataBlocks: 8, onDisks: 10, offDisks: 1, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                // 17
-	{dataBlocks: 10, onDisks: 14, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 17, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},              // 18
-	{dataBlocks: 2, onDisks: 6, offDisks: 2, blocksize: int64(oneMiByte), data: oneMiByte, offset: oneMiByte / 2, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},       // 19
-	{dataBlocks: 10, onDisks: 16, offDisks: 8, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true},                // 20
+	{dataBlocks: 3, onDisks: 6, offDisks: 1, blocksize: int64(blockSizeV1), data: oneMiByte, offset: oneMiByte / 2, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},     // 12
+	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(oneMiByte / 2), data: oneMiByte, offset: oneMiByte/2 + 1, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 13
+	{dataBlocks: 4, onDisks: 8, offDisks: 0, blocksize: int64(oneMiByte - 1), data: oneMiByte, offset: oneMiByte - 1, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},               // 14
+	{dataBlocks: 8, onDisks: 12, offDisks: 2, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 2, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                // 15
+	{dataBlocks: 8, onDisks: 10, offDisks: 1, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                // 16
+	{dataBlocks: 10, onDisks: 14, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 17, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},              // 17
+	{dataBlocks: 2, onDisks: 6, offDisks: 2, blocksize: int64(oneMiByte), data: oneMiByte, offset: oneMiByte / 2, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},       // 18
+	{dataBlocks: 10, onDisks: 16, offDisks: 8, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true},                // 19
 }
 
 func TestErasureCreateFile(t *testing.T) {
@@ -71,7 +70,8 @@ func TestErasureCreateFile(t *testing.T) {
 		if err != nil {
 			t.Fatalf("Test %d: failed to create test setup: %v", i, err)
 		}
-		storage, err := NewErasureStorage(context.Background(), setup.disks, test.dataBlocks, test.onDisks-test.dataBlocks, test.blocksize)
+		disks := setup.disks
+		storage, err := NewErasureStorage(context.Background(), test.dataBlocks, test.onDisks-test.dataBlocks, test.blocksize)
 		if err != nil {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to create ErasureStorage: %v", i, err)
@@ -83,25 +83,43 @@ func TestErasureCreateFile(t *testing.T) {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to generate random test data: %v", i, err)
 		}
-		file, err := storage.CreateFile(context.Background(), bytes.NewReader(data[test.offset:]), "testbucket", "object", buffer, test.algorithm, test.dataBlocks+1)
+		writers := make([]*bitrotWriter, len(disks))
+		for i, disk := range disks {
+			if disk == OfflineDisk {
+				continue
+			}
+			writers[i] = newBitrotWriter(disk, "testbucket", "object", test.algorithm)
+		}
+		n, err := storage.CreateFile(context.Background(), bytes.NewReader(data[test.offset:]), writers, buffer, storage.dataBlocks+1)
 		if err != nil && !test.shouldFail {
 			t.Errorf("Test %d: should pass but failed with: %v", i, err)
 		}
 		if err == nil && test.shouldFail {
 			t.Errorf("Test %d: should fail but it passed", i)
 		}
-
-		if err == nil {
-			if length := int64(len(data[test.offset:])); file.Size != length {
-				t.Errorf("Test %d: invalid number of bytes written: got: #%d want #%d", i, file.Size, length)
+		for i, w := range writers {
+			if w == nil {
+				disks[i] = OfflineDisk
 			}
-			for j := range storage.disks[:test.offDisks] {
-				storage.disks[j] = badDisk{nil}
+		}
+		if err == nil {
+			if length := int64(len(data[test.offset:])); n != length {
+				t.Errorf("Test %d: invalid number of bytes written: got: #%d want #%d", i, n, length)
+			}
+			writers := make([]*bitrotWriter, len(disks))
+			for i, disk := range disks {
+				if disk == nil {
+					continue
+				}
+				writers[i] = newBitrotWriter(disk, "testbucket", "object2", test.algorithm)
+			}
+			for j := range disks[:test.offDisks] {
+				writers[j].disk = badDisk{nil}
 			}
 			if test.offDisks > 0 {
-				storage.disks[0] = OfflineDisk
+				writers[0] = nil
 			}
-			file, err = storage.CreateFile(context.Background(), bytes.NewReader(data[test.offset:]), "testbucket", "object2", buffer, test.algorithm, test.dataBlocks+1)
+			n, err = storage.CreateFile(context.Background(), bytes.NewReader(data[test.offset:]), writers, buffer, storage.dataBlocks+1)
 			if err != nil && !test.shouldFailQuorum {
 				t.Errorf("Test %d: should pass but failed with: %v", i, err)
 			}
@@ -109,8 +127,8 @@ func TestErasureCreateFile(t *testing.T) {
 				t.Errorf("Test %d: should fail but it passed", i)
 			}
 			if err == nil {
-				if length := int64(len(data[test.offset:])); file.Size != length {
-					t.Errorf("Test %d: invalid number of bytes written: got: #%d want #%d", i, file.Size, length)
+				if length := int64(len(data[test.offset:])); n != length {
+					t.Errorf("Test %d: invalid number of bytes written: got: #%d want #%d", i, n, length)
 				}
 			}
 		}
@@ -126,25 +144,33 @@ func benchmarkErasureWrite(data, parity, dataDown, parityDown int, size int64, b
 		b.Fatalf("failed to create test setup: %v", err)
 	}
 	defer setup.Remove()
-	storage, err := NewErasureStorage(context.Background(), setup.disks, data, parity, blockSizeV1)
+	storage, err := NewErasureStorage(context.Background(), data, parity, blockSizeV1)
 	if err != nil {
 		b.Fatalf("failed to create ErasureStorage: %v", err)
 	}
+	disks := setup.disks
 	buffer := make([]byte, blockSizeV1, 2*blockSizeV1)
 	content := make([]byte, size)
 
 	for i := 0; i < dataDown; i++ {
-		storage.disks[i] = OfflineDisk
+		disks[i] = OfflineDisk
 	}
 	for i := data; i < data+parityDown; i++ {
-		storage.disks[i] = OfflineDisk
+		disks[i] = OfflineDisk
 	}
 
 	b.ResetTimer()
 	b.SetBytes(size)
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
-		_, err := storage.CreateFile(context.Background(), bytes.NewReader(content), "testbucket", "object", buffer, DefaultBitrotAlgorithm, data+1)
+		writers := make([]*bitrotWriter, len(disks))
+		for i, disk := range disks {
+			if disk == OfflineDisk {
+				continue
+			}
+			writers[i] = newBitrotWriter(disk, "testbucket", "object", DefaultBitrotAlgorithm)
+		}
+		_, err := storage.CreateFile(context.Background(), bytes.NewReader(content), writers, buffer, storage.dataBlocks+1)
 		if err != nil {
 			panic(err)
 		}

cmd/erasure-healfile.go

@@ -18,171 +18,31 @@ package cmd
 
 import (
 	"context"
-	"fmt"
-	"hash"
-	"strings"
+	"io"
 
 	"github.com/minio/minio/cmd/logger"
 )
 
-// HealFile tries to reconstruct an erasure-coded file spread over all
-// available disks. HealFile will read the valid parts of the file,
-// reconstruct the missing data and write the reconstructed parts back
-// to `staleDisks` at the destination `dstVol/dstPath/`. Parts are
-// verified against the given BitrotAlgorithm and checksums.
-//
-// `staleDisks` is a slice of disks where each non-nil entry has stale
-// or no data, and so will be healed.
-//
-// It is required that `s.disks` have a (read-quorum) majority of
-// disks with valid data for healing to work.
-//
-// In addition, `staleDisks` and `s.disks` must have the same ordering
-// of disks w.r.t. erasure coding of the object.
-//
-// Errors when writing to `staleDisks` are not propagated as long as
-// writes succeed for at least one disk. This allows partial healing
-// despite stale disks being faulty.
-//
-// It returns bitrot checksums for the non-nil staleDisks on which
-// healing succeeded.
-func (s ErasureStorage) HealFile(ctx context.Context, staleDisks []StorageAPI, volume, path string, blocksize int64,
-	dstVol, dstPath string, size int64, alg BitrotAlgorithm, checksums [][]byte) (
-	f ErasureFileInfo, err error) {
-
-	if !alg.Available() {
-		logger.LogIf(ctx, errBitrotHashAlgoInvalid)
-		return f, errBitrotHashAlgoInvalid
-	}
-
-	// Initialization
-	f.Checksums = make([][]byte, len(s.disks))
-	hashers := make([]hash.Hash, len(s.disks))
-	verifiers := make([]*BitrotVerifier, len(s.disks))
-	for i, disk := range s.disks {
-		switch {
-		case staleDisks[i] != nil:
-			hashers[i] = alg.New()
-		case disk == nil:
-			// disregard unavailable disk
-			continue
-		default:
-			verifiers[i] = NewBitrotVerifier(alg, checksums[i])
+// HealFile heals the shard files on non-nil writers. Note that the quorum passed is 1
+// as healing should continue even if it has been successful healing only one shard file.
+func (s ErasureStorage) HealFile(ctx context.Context, readers []*bitrotReader, writers []*bitrotWriter, size int64) error {
+	r, w := io.Pipe()
+	go func() {
+		if err := s.ReadFile(ctx, w, readers, 0, size, size); err != nil {
+			w.CloseWithError(err)
+			return
 		}
-	}
-	writeErrors := make([]error, len(s.disks))
-
-	// Read part file data on each disk
-	chunksize := ceilFrac(blocksize, int64(s.dataBlocks))
-	numBlocks := ceilFrac(size, blocksize)
-
-	readLen := chunksize * (numBlocks - 1)
-
-	lastChunkSize := chunksize
-	hasSmallerLastBlock := size%blocksize != 0
-	if hasSmallerLastBlock {
-		lastBlockLen := size % blocksize
-		lastChunkSize = ceilFrac(lastBlockLen, int64(s.dataBlocks))
-	}
-	readLen += lastChunkSize
-	var buffers [][]byte
-	buffers, _, err = s.readConcurrent(ctx, volume, path, 0, readLen, verifiers)
+		w.Close()
+	}()
+	buf := make([]byte, s.blockSize)
+	// quorum is 1 because CreateFile should continue writing as long as we are writing to even 1 disk.
+	n, err := s.CreateFile(ctx, r, writers, buf, 1)
 	if err != nil {
-		return f, err
+		return err
 	}
-
-	// Scan part files on disk, block-by-block reconstruct it and
-	// write to stale disks.
-	blocks := make([][]byte, len(s.disks))
-
-	if numBlocks > 1 {
-		// Allocate once for all the equal length blocks. The
-		// last block may have a different length - allocation
-		// for this happens inside the for loop below.
-		for i := range blocks {
-			if len(buffers[i]) == 0 {
-				blocks[i] = make([]byte, chunksize)
-			}
-		}
+	if n != size {
+		logger.LogIf(ctx, errLessData)
+		return errLessData
 	}
-
-	var buffOffset int64
-	for blockNumber := int64(0); blockNumber < numBlocks; blockNumber++ {
-		if blockNumber == numBlocks-1 && lastChunkSize != chunksize {
-			for i := range blocks {
-				if len(buffers[i]) == 0 {
-					blocks[i] = make([]byte, lastChunkSize)
-				}
-			}
-		}
-
-		for i := range blocks {
-			if len(buffers[i]) == 0 {
-				blocks[i] = blocks[i][0:0]
-			}
-		}
-
-		csize := chunksize
-		if blockNumber == numBlocks-1 {
-			csize = lastChunkSize
-		}
-		for i := range blocks {
-			if len(buffers[i]) != 0 {
-				blocks[i] = buffers[i][buffOffset : buffOffset+csize]
-			}
-		}
-		buffOffset += csize
-
-		if err = s.ErasureDecodeDataAndParityBlocks(ctx, blocks); err != nil {
-			return f, err
-		}
-
-		// write computed shards as chunks on file in each
-		// stale disk
-		writeSucceeded := false
-		for i, disk := range staleDisks {
-			// skip nil disk or disk that had error on
-			// previous write
-			if disk == nil || writeErrors[i] != nil {
-				continue
-			}
-
-			writeErrors[i] = disk.AppendFile(dstVol, dstPath, blocks[i])
-			if writeErrors[i] == nil {
-				hashers[i].Write(blocks[i])
-				writeSucceeded = true
-			}
-		}
-
-		// If all disks had write errors we quit.
-		if !writeSucceeded {
-			// build error from all write errors
-			err := joinWriteErrors(writeErrors)
-			logger.LogIf(ctx, err)
-			return f, err
-		}
-	}
-
-	// copy computed file hashes into output variable
-	f.Size = size
-	f.Algorithm = alg
-	for i, disk := range staleDisks {
-		if disk == nil || writeErrors[i] != nil {
-			continue
-		}
-		f.Checksums[i] = hashers[i].Sum(nil)
-	}
-	return f, nil
-}
-
-func joinWriteErrors(errs []error) error {
-	msgs := []string{}
-	for i, err := range errs {
-		if err == nil {
-			continue
-		}
-		msgs = append(msgs, fmt.Sprintf("disk %d: %v", i+1, err))
-	}
-	return fmt.Errorf("all stale disks had write errors during healing: %s",
-		strings.Join(msgs, ", "))
+	return nil
 }

cmd/erasure-healfile_test.go

@@ -21,7 +21,6 @@ import (
 	"context"
 	"crypto/rand"
 	"io"
-	"reflect"
 	"testing"
 )
 
@@ -56,11 +55,9 @@ var erasureHealFileTests = []struct {
 	{dataBlocks: 7, disks: 14, offDisks: 6, badDisks: 1, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false},  // 14
 	{dataBlocks: 8, disks: 16, offDisks: 4, badDisks: 5, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: true},   // 15
 	{dataBlocks: 2, disks: 4, offDisks: 1, badDisks: 0, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false},   // 16
-	{dataBlocks: 2, disks: 4, offDisks: 0, badDisks: 0, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: 0, shouldFail: true},                         // 17
-	{dataBlocks: 12, disks: 16, offDisks: 2, badDisks: 1, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false}, // 18
-	{dataBlocks: 6, disks: 8, offDisks: 1, badDisks: 0, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: BLAKE2b512, shouldFail: false},               // 19
-	{dataBlocks: 7, disks: 10, offDisks: 1, badDisks: 0, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: 0, shouldFail: true},                        // 20
-	{dataBlocks: 2, disks: 4, offDisks: 1, badDisks: 0, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte * 64, algorithm: SHA256, shouldFail: false},              // 21
+	{dataBlocks: 12, disks: 16, offDisks: 2, badDisks: 1, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false}, // 17
+	{dataBlocks: 6, disks: 8, offDisks: 1, badDisks: 0, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte, algorithm: BLAKE2b512, shouldFail: false},               // 18
+	{dataBlocks: 2, disks: 4, offDisks: 1, badDisks: 0, badStaleDisks: 0, blocksize: int64(blockSizeV1), size: oneMiByte * 64, algorithm: SHA256, shouldFail: false},              // 19
 }
 
 func TestErasureHealFile(t *testing.T) {
@@ -75,7 +72,8 @@ func TestErasureHealFile(t *testing.T) {
 		if err != nil {
 			t.Fatalf("Test %d: failed to setup XL environment: %v", i, err)
 		}
-		storage, err := NewErasureStorage(context.Background(), setup.disks, test.dataBlocks, test.disks-test.dataBlocks, test.blocksize)
+		disks := setup.disks
+		storage, err := NewErasureStorage(context.Background(), test.dataBlocks, test.disks-test.dataBlocks, test.blocksize)
 		if err != nil {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to create ErasureStorage: %v", i, err)
@@ -85,36 +83,50 @@ func TestErasureHealFile(t *testing.T) {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to create random test data: %v", i, err)
 		}
-		algorithm := test.algorithm
-		if !algorithm.Available() {
-			algorithm = DefaultBitrotAlgorithm
-		}
 		buffer := make([]byte, test.blocksize, 2*test.blocksize)
-		file, err := storage.CreateFile(context.Background(), bytes.NewReader(data), "testbucket", "testobject", buffer, algorithm, test.dataBlocks+1)
+		writers := make([]*bitrotWriter, len(disks))
+		for i, disk := range disks {
+			writers[i] = newBitrotWriter(disk, "testbucket", "testobject", test.algorithm)
+		}
+		_, err = storage.CreateFile(context.Background(), bytes.NewReader(data), writers, buffer, storage.dataBlocks+1)
 		if err != nil {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to create random test data: %v", i, err)
 		}
 
+		readers := make([]*bitrotReader, len(disks))
+		for i, disk := range disks {
+			shardFilesize := getErasureShardFileSize(test.blocksize, test.size, storage.dataBlocks)
+			readers[i] = newBitrotReader(disk, "testbucket", "testobject", test.algorithm, shardFilesize, writers[i].Sum())
+		}
+
 		// setup stale disks for the test case
-		staleDisks := make([]StorageAPI, len(storage.disks))
-		copy(staleDisks, storage.disks)
-		for j := 0; j < len(storage.disks); j++ {
+		staleDisks := make([]StorageAPI, len(disks))
+		copy(staleDisks, disks)
+		for j := 0; j < len(staleDisks); j++ {
 			if j < test.offDisks {
-				storage.disks[j] = OfflineDisk
+				readers[j] = nil
 			} else {
 				staleDisks[j] = nil
 			}
 		}
 		for j := 0; j < test.badDisks; j++ {
-			storage.disks[test.offDisks+j] = badDisk{nil}
+			readers[test.offDisks+j].disk = badDisk{nil}
 		}
 		for j := 0; j < test.badStaleDisks; j++ {
 			staleDisks[j] = badDisk{nil}
 		}
 
+		staleWriters := make([]*bitrotWriter, len(staleDisks))
+		for i, disk := range staleDisks {
+			if disk == nil {
+				continue
+			}
+			staleWriters[i] = newBitrotWriter(disk, "testbucket", "testobject", test.algorithm)
+		}
+
 		// test case setup is complete - now call Healfile()
-		info, err := storage.HealFile(context.Background(), staleDisks, "testbucket", "testobject", test.blocksize, "testbucket", "healedobject", test.size, test.algorithm, file.Checksums)
+		err = storage.HealFile(context.Background(), readers, staleWriters, test.size)
 		if err != nil && !test.shouldFail {
 			t.Errorf("Test %d: should pass but it failed with: %v", i, err)
 		}
@@ -122,19 +134,13 @@ func TestErasureHealFile(t *testing.T) {
 			t.Errorf("Test %d: should fail but it passed", i)
 		}
 		if err == nil {
-			if info.Size != test.size {
-				t.Errorf("Test %d: healed wrong number of bytes: got: #%d want: #%d", i, info.Size, test.size)
-			}
-			if info.Algorithm != test.algorithm {
-				t.Errorf("Test %d: healed with wrong algorithm: got: %v want: %v", i, info.Algorithm, test.algorithm)
-			}
 			// Verify that checksums of staleDisks
 			// match expected values
-			for i, disk := range staleDisks {
-				if disk == nil || info.Checksums[i] == nil {
+			for i := range staleWriters {
+				if staleWriters[i] == nil {
 					continue
 				}
-				if !reflect.DeepEqual(info.Checksums[i], file.Checksums[i]) {
+				if !bytes.Equal(staleWriters[i].Sum(), writers[i].Sum()) {
 					t.Errorf("Test %d: heal returned different bitrot checksums", i)
 				}
 			}

cmd/erasure-readfile.go

@@ -23,214 +23,166 @@ import (
 	"github.com/minio/minio/cmd/logger"
 )
 
-type errIdx struct {
-	idx int
-	err error
+// Reads in parallel from bitrotReaders.
+type parallelReader struct {
+	readers       []*bitrotReader
+	dataBlocks    int
+	offset        int64
+	shardSize     int64
+	shardFileSize int64
 }
 
-func (s ErasureStorage) readConcurrent(ctx context.Context, volume, path string, offset, length int64,
-	verifiers []*BitrotVerifier) (buffers [][]byte, needsReconstruction bool,
-	err error) {
+// newParallelReader returns parallelReader.
+func newParallelReader(readers []*bitrotReader, dataBlocks int, offset int64, fileSize int64, blocksize int64) *parallelReader {
+	shardSize := ceilFrac(blocksize, int64(dataBlocks))
+	shardFileSize := getErasureShardFileSize(blocksize, fileSize, dataBlocks)
+	return &parallelReader{
+		readers,
+		dataBlocks,
+		(offset / blocksize) * shardSize,
+		shardSize,
+		shardFileSize,
+	}
+}
 
-	errChan := make(chan errIdx)
-	stageBuffers := make([][]byte, len(s.disks))
-	buffers = make([][]byte, len(s.disks))
-
-	readDisk := func(i int) {
-		stageBuffers[i] = make([]byte, length)
-		disk := s.disks[i]
-		if disk == OfflineDisk {
-			logger.LogIf(ctx, errDiskNotFound)
-			errChan <- errIdx{i, errDiskNotFound}
-			return
+// Returns if buf can be erasure decoded.
+func (p *parallelReader) canDecode(buf [][]byte) bool {
+	bufCount := 0
+	for _, b := range buf {
+		if b != nil {
+			bufCount++
 		}
-		_, rerr := disk.ReadFile(volume, path, offset, stageBuffers[i], verifiers[i])
-		errChan <- errIdx{i, rerr}
+	}
+	return bufCount >= p.dataBlocks
+}
+
+// Read reads from bitrotReaders in parallel. Returns p.dataBlocks number of bufs.
+func (p *parallelReader) Read() ([][]byte, error) {
+	type errIdx struct {
+		idx int
+		buf []byte
+		err error
 	}
 
-	var finishedCount, successCount, launchIndex int
+	errCh := make(chan errIdx)
+	currReaderIndex := 0
+	newBuf := make([][]byte, len(p.readers))
 
-	for ; launchIndex < s.dataBlocks; launchIndex++ {
-		go readDisk(launchIndex)
+	if p.offset+p.shardSize > p.shardFileSize {
+		p.shardSize = p.shardFileSize - p.offset
 	}
-	for finishedCount < launchIndex {
-		select {
-		case errVal := <-errChan:
-			finishedCount++
-			if errVal.err != nil {
-				// TODO: meaningfully log the disk read error
 
-				// A disk failed to return data, so we
-				// request an additional disk if possible
-				if launchIndex < s.dataBlocks+s.parityBlocks {
-					needsReconstruction = true
-					// requiredBlocks++
-					go readDisk(launchIndex)
-					launchIndex++
-				}
-			} else {
-				successCount++
-				buffers[errVal.idx] = stageBuffers[errVal.idx]
-				stageBuffers[errVal.idx] = nil
+	read := func(currReaderIndex int) {
+		b, err := p.readers[currReaderIndex].ReadChunk(p.offset, p.shardSize)
+		errCh <- errIdx{currReaderIndex, b, err}
+	}
+
+	readerCount := 0
+	for _, r := range p.readers {
+		if r != nil {
+			readerCount++
+		}
+	}
+	if readerCount < p.dataBlocks {
+		return nil, errXLReadQuorum
+	}
+
+	readerCount = 0
+	for i, r := range p.readers {
+		if r == nil {
+			continue
+		}
+		go read(i)
+		readerCount++
+		if readerCount == p.dataBlocks {
+			currReaderIndex = i + 1
+			break
+		}
+	}
+
+	for errVal := range errCh {
+		if errVal.err == nil {
+			newBuf[errVal.idx] = errVal.buf
+			if p.canDecode(newBuf) {
+				p.offset += int64(p.shardSize)
+				return newBuf, nil
 			}
+			continue
 		}
+		p.readers[errVal.idx] = nil
+		for currReaderIndex < len(p.readers) {
+			if p.readers[currReaderIndex] != nil {
+				break
+			}
+			currReaderIndex++
+		}
+
+		if currReaderIndex == len(p.readers) {
+			break
+		}
+		go read(currReaderIndex)
+		currReaderIndex++
 	}
-	if successCount != s.dataBlocks {
-		// Not enough disks returns data.
-		err = errXLReadQuorum
-		logger.LogIf(ctx, err)
-	}
-	return
+
+	return nil, errXLReadQuorum
 }
 
-// ReadFile reads as much data as requested from the file under the
-// given volume and path and writes the data to the provided writer.
-// The algorithm and the keys/checksums are used to verify the
-// integrity of the given file. ReadFile will read data from the given
-// offset up to the given length. If parts of the file are corrupted
-// ReadFile tries to reconstruct the data.
-func (s ErasureStorage) ReadFile(ctx context.Context, writer io.Writer, volume, path string, offset,
-	length, totalLength int64, checksums [][]byte, algorithm BitrotAlgorithm,
-	blocksize int64) (f ErasureFileInfo, err error) {
-
+// ReadFile reads from readers, reconstructs data if needed and writes the data to the writer.
+func (s ErasureStorage) ReadFile(ctx context.Context, writer io.Writer, readers []*bitrotReader, offset, length, totalLength int64) error {
 	if offset < 0 || length < 0 {
-		logger.LogIf(ctx, errUnexpected)
-		return f, errUnexpected
+		logger.LogIf(ctx, errInvalidArgument)
+		return errInvalidArgument
 	}
 	if offset+length > totalLength {
-		logger.LogIf(ctx, errUnexpected)
-		return f, errUnexpected
+		logger.LogIf(ctx, errInvalidArgument)
+		return errInvalidArgument
 	}
-	if !algorithm.Available() {
-		logger.LogIf(ctx, errBitrotHashAlgoInvalid)
-		return f, errBitrotHashAlgoInvalid
-	}
-
-	f.Checksums = make([][]byte, len(s.disks))
-	verifiers := make([]*BitrotVerifier, len(s.disks))
-	for i, disk := range s.disks {
-		if disk == OfflineDisk {
-			continue
-		}
-		verifiers[i] = NewBitrotVerifier(algorithm, checksums[i])
-	}
-
-	chunksize := ceilFrac(blocksize, int64(s.dataBlocks))
-
-	// We read all whole-blocks of erasure coded data containing
-	// the requested data range.
-	//
-	// The start index of the erasure coded block containing the
-	// `offset` byte of data is:
-	partDataStartIndex := (offset / blocksize) * chunksize
-	// The start index of the erasure coded block containing the
-	// (last) byte of data at the index `offset + length - 1` is:
-	blockStartIndex := ((offset + length - 1) / blocksize) * chunksize
-	// However, we need the end index of the e.c. block containing
-	// the last byte - we need to check if that block is the last
-	// block in the part (in that case, it may be have a different
-	// chunk size)
-	isLastBlock := (totalLength-1)/blocksize == (offset+length-1)/blocksize
-	var partDataEndIndex int64
-	if isLastBlock {
-		lastBlockChunkSize := chunksize
-		if totalLength%blocksize != 0 {
-			lastBlockChunkSize = ceilFrac(totalLength%blocksize, int64(s.dataBlocks))
-		}
-		partDataEndIndex = blockStartIndex + lastBlockChunkSize - 1
-	} else {
-		partDataEndIndex = blockStartIndex + chunksize - 1
-	}
-
-	// Thus, the length of data to be read from the part file(s) is:
-	partDataLength := partDataEndIndex - partDataStartIndex + 1
-	// The calculation above does not apply when length == 0:
 	if length == 0 {
-		partDataLength = 0
+		return nil
 	}
 
-	var buffers [][]byte
-	var needsReconstruction bool
-	buffers, needsReconstruction, err = s.readConcurrent(ctx, volume, path,
-		partDataStartIndex, partDataLength, verifiers)
-	if err != nil {
-		// Could not read enough disks.
-		return
-	}
+	reader := newParallelReader(readers, s.dataBlocks, offset, totalLength, s.blockSize)
 
-	numChunks := ceilFrac(partDataLength, chunksize)
-	blocks := make([][]byte, len(s.disks))
+	startBlock := offset / s.blockSize
+	endBlock := (offset + length) / s.blockSize
 
-	if needsReconstruction && numChunks > 1 {
-		// Allocate once for all the equal length blocks. The
-		// last block may have a different length - allocation
-		// for this happens inside the for loop below.
-		for i := range blocks {
-			if len(buffers[i]) == 0 {
-				blocks[i] = make([]byte, chunksize)
-			}
+	var bytesWritten int64
+	for block := startBlock; block <= endBlock; block++ {
+		var blockOffset, blockLength int64
+		switch {
+		case startBlock == endBlock:
+			blockOffset = offset % s.blockSize
+			blockLength = length
+		case block == startBlock:
+			blockOffset = offset % s.blockSize
+			blockLength = s.blockSize - blockOffset
+		case block == endBlock:
+			blockOffset = 0
+			blockLength = (offset + length) % s.blockSize
+		default:
+			blockOffset = 0
+			blockLength = s.blockSize
 		}
-	}
-
-	var buffOffset int64
-	for chunkNumber := int64(0); chunkNumber < numChunks; chunkNumber++ {
-		if chunkNumber == numChunks-1 && partDataLength%chunksize != 0 {
-			chunksize = partDataLength % chunksize
-			// We allocate again as the last chunk has a
-			// different size.
-			for i := range blocks {
-				if len(buffers[i]) == 0 {
-					blocks[i] = make([]byte, chunksize)
-				}
-			}
+		if blockLength == 0 {
+			break
 		}
-
-		for i := range blocks {
-			if len(buffers[i]) == 0 {
-				blocks[i] = blocks[i][0:0]
-			}
-		}
-
-		for i := range blocks {
-			if len(buffers[i]) != 0 {
-				blocks[i] = buffers[i][buffOffset : buffOffset+chunksize]
-			}
-		}
-		buffOffset += chunksize
-
-		if needsReconstruction {
-			if err = s.ErasureDecodeDataBlocks(blocks); err != nil {
-				logger.LogIf(ctx, err)
-				return f, err
-			}
-		}
-
-		var writeStart int64
-		if chunkNumber == 0 {
-			writeStart = offset % blocksize
-		}
-
-		writeLength := blocksize - writeStart
-		if chunkNumber == numChunks-1 {
-			lastBlockLength := (offset + length) % blocksize
-			if lastBlockLength != 0 {
-				writeLength = lastBlockLength - writeStart
-			}
-		}
-		n, err := writeDataBlocks(ctx, writer, blocks, s.dataBlocks, writeStart, writeLength)
+		bufs, err := reader.Read()
 		if err != nil {
-			return f, err
+			return err
 		}
-
-		f.Size += n
-	}
-
-	f.Algorithm = algorithm
-	for i, disk := range s.disks {
-		if disk == OfflineDisk || buffers[i] == nil {
-			continue
+		if err = s.ErasureDecodeDataBlocks(bufs); err != nil {
+			logger.LogIf(ctx, err)
+			return err
 		}
-		f.Checksums[i] = verifiers[i].Sum(nil)
+		n, err := writeDataBlocks(ctx, writer, bufs, s.dataBlocks, blockOffset, blockLength)
+		if err != nil {
+			return err
+		}
+		bytesWritten += n
 	}
-	return f, nil
+	if bytesWritten != length {
+		logger.LogIf(ctx, errLessData)
+		return errLessData
+	}
+	return nil
 }

cmd/erasure-readfile_test.go

@@ -19,11 +19,12 @@ package cmd
 import (
 	"bytes"
 	"context"
-	crand "crypto/rand"
 	"io"
 	"math/rand"
 	"testing"
 
+	crand "crypto/rand"
+
 	humanize "github.com/dustin/go-humanize"
 )
 
@@ -66,19 +67,18 @@ var erasureReadFileTests = []struct {
 	{dataBlocks: 8, onDisks: 16, offDisks: 7, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                                            // 23
 	{dataBlocks: 2, onDisks: 4, offDisks: 1, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                                             // 24
 	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},                                             // 25
-	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: oneMiByte, offset: 0, length: oneMiByte, algorithm: 0, shouldFail: true, shouldFailQuorum: false},                                                                   // 26
-	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(blockSizeV1) + 1, offset: 0, length: int64(blockSizeV1) + 1, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                               // 27
-	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 12, length: int64(blockSizeV1) + 17, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                             // 28
-	{dataBlocks: 3, onDisks: 6, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 1023, length: int64(blockSizeV1) + 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},             // 29
-	{dataBlocks: 4, onDisks: 8, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 11, length: int64(blockSizeV1) + 2*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},             // 30
-	{dataBlocks: 6, onDisks: 12, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 512, length: int64(blockSizeV1) + 8*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},           // 31
-	{dataBlocks: 8, onDisks: 16, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: int64(blockSizeV1), length: int64(blockSizeV1) - 1, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 32
-	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(oneMiByte), offset: -1, length: 3, algorithm: DefaultBitrotAlgorithm, shouldFail: true, shouldFailQuorum: false},                                              // 33
-	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(oneMiByte), offset: 1024, length: -1, algorithm: DefaultBitrotAlgorithm, shouldFail: true, shouldFailQuorum: false},                                           // 34
-	{dataBlocks: 4, onDisks: 6, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(blockSizeV1), offset: 0, length: int64(blockSizeV1), algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                                       // 35
-	{dataBlocks: 4, onDisks: 6, offDisks: 1, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 12, length: int64(blockSizeV1) + 17, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                             // 36
-	{dataBlocks: 4, onDisks: 6, offDisks: 3, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 1023, length: int64(blockSizeV1) + 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true},              // 37
-	{dataBlocks: 8, onDisks: 12, offDisks: 4, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 11, length: int64(blockSizeV1) + 2*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},            // 38
+	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(blockSizeV1) + 1, offset: 0, length: int64(blockSizeV1) + 1, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                               // 26
+	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 12, length: int64(blockSizeV1) + 17, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                             // 27
+	{dataBlocks: 3, onDisks: 6, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 1023, length: int64(blockSizeV1) + 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},             // 28
+	{dataBlocks: 4, onDisks: 8, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 11, length: int64(blockSizeV1) + 2*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},             // 29
+	{dataBlocks: 6, onDisks: 12, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 512, length: int64(blockSizeV1) + 8*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},           // 30
+	{dataBlocks: 8, onDisks: 16, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: int64(blockSizeV1), length: int64(blockSizeV1) - 1, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false}, // 31
+	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(oneMiByte), offset: -1, length: 3, algorithm: DefaultBitrotAlgorithm, shouldFail: true, shouldFailQuorum: false},                                              // 32
+	{dataBlocks: 2, onDisks: 4, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(oneMiByte), offset: 1024, length: -1, algorithm: DefaultBitrotAlgorithm, shouldFail: true, shouldFailQuorum: false},                                           // 33
+	{dataBlocks: 4, onDisks: 6, offDisks: 0, blocksize: int64(blockSizeV1), data: int64(blockSizeV1), offset: 0, length: int64(blockSizeV1), algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                                       // 34
+	{dataBlocks: 4, onDisks: 6, offDisks: 1, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 12, length: int64(blockSizeV1) + 17, algorithm: BLAKE2b512, shouldFail: false, shouldFailQuorum: false},                             // 35
+	{dataBlocks: 4, onDisks: 6, offDisks: 3, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 1023, length: int64(blockSizeV1) + 1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: true},              // 36
+	{dataBlocks: 8, onDisks: 12, offDisks: 4, blocksize: int64(blockSizeV1), data: int64(2 * blockSizeV1), offset: 11, length: int64(blockSizeV1) + 2*1024, algorithm: DefaultBitrotAlgorithm, shouldFail: false, shouldFailQuorum: false},            // 37
 }
 
 func TestErasureReadFile(t *testing.T) {
@@ -87,29 +87,54 @@ func TestErasureReadFile(t *testing.T) {
 		if err != nil {
 			t.Fatalf("Test %d: failed to create test setup: %v", i, err)
 		}
-		storage, err := NewErasureStorage(context.Background(), setup.disks, test.dataBlocks, test.onDisks-test.dataBlocks, test.blocksize)
+		storage, err := NewErasureStorage(context.Background(), test.dataBlocks, test.onDisks-test.dataBlocks, test.blocksize)
 		if err != nil {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to create ErasureStorage: %v", i, err)
 		}
-
+		disks := setup.disks
 		data := make([]byte, test.data)
 		if _, err = io.ReadFull(crand.Reader, data); err != nil {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to generate random test data: %v", i, err)
 		}
+
 		writeAlgorithm := test.algorithm
 		if !test.algorithm.Available() {
 			writeAlgorithm = DefaultBitrotAlgorithm
 		}
 		buffer := make([]byte, test.blocksize, 2*test.blocksize)
-		file, err := storage.CreateFile(context.Background(), bytes.NewReader(data[:]), "testbucket", "object", buffer, writeAlgorithm, test.dataBlocks+1)
+		writers := make([]*bitrotWriter, len(disks))
+		for i, disk := range disks {
+			writers[i] = newBitrotWriter(disk, "testbucket", "object", writeAlgorithm)
+		}
+		n, err := storage.CreateFile(context.Background(), bytes.NewReader(data[:]), writers, buffer, storage.dataBlocks+1)
 		if err != nil {
 			setup.Remove()
 			t.Fatalf("Test %d: failed to create erasure test file: %v", i, err)
 		}
+		if n != test.data {
+			setup.Remove()
+			t.Fatalf("Test %d: failed to create erasure test file", i)
+		}
+		for i, w := range writers {
+			if w == nil {
+				disks[i] = nil
+			}
+		}
+
+		// Get the checksums of the current part.
+		bitrotReaders := make([]*bitrotReader, len(disks))
+		for index, disk := range disks {
+			if disk == OfflineDisk {
+				continue
+			}
+			endOffset := getErasureShardFileEndOffset(test.offset, test.length, test.data, test.blocksize, storage.dataBlocks)
+			bitrotReaders[index] = newBitrotReader(disk, "testbucket", "object", writeAlgorithm, endOffset, writers[index].Sum())
+		}
+
 		writer := bytes.NewBuffer(nil)
-		readInfo, err := storage.ReadFile(context.Background(), writer, "testbucket", "object", test.offset, test.length, test.data, file.Checksums, test.algorithm, test.blocksize)
+		err = storage.ReadFile(context.Background(), writer, bitrotReaders, test.offset, test.length, test.data)
 		if err != nil && !test.shouldFail {
 			t.Errorf("Test %d: should pass but failed with: %v", i, err)
 		}
@@ -117,25 +142,32 @@ func TestErasureReadFile(t *testing.T) {
 			t.Errorf("Test %d: should fail but it passed", i)
 		}
 		if err == nil {
-			if readInfo.Size != test.length {
-				t.Errorf("Test %d: read returns wrong number of bytes: got: #%d want: #%d", i, readInfo.Size, test.length)
-			}
-			if readInfo.Algorithm != test.algorithm {
-				t.Errorf("Test %d: read returns wrong algorithm: got: %v want: %v", i, readInfo.Algorithm, test.algorithm)
-			}
 			if content := writer.Bytes(); !bytes.Equal(content, data[test.offset:test.offset+test.length]) {
 				t.Errorf("Test %d: read retruns wrong file content", i)
 			}
 		}
+		for i, r := range bitrotReaders {
+			if r == nil {
+				disks[i] = OfflineDisk
+			}
+		}
 		if err == nil && !test.shouldFail {
-			writer.Reset()
-			for j := range storage.disks[:test.offDisks] {
-				storage.disks[j] = badDisk{nil}
+			bitrotReaders = make([]*bitrotReader, len(disks))
+			for index, disk := range disks {
+				if disk == OfflineDisk {
+					continue
+				}
+				endOffset := getErasureShardFileEndOffset(test.offset, test.length, test.data, test.blocksize, storage.dataBlocks)
+				bitrotReaders[index] = newBitrotReader(disk, "testbucket", "object", writeAlgorithm, endOffset, writers[index].Sum())
+			}
+			for j := range disks[:test.offDisks] {
+				bitrotReaders[j].disk = badDisk{nil}
 			}
 			if test.offDisks > 0 {
-				storage.disks[0] = OfflineDisk
+				bitrotReaders[0] = nil
 			}
-			readInfo, err = storage.ReadFile(context.Background(), writer, "testbucket", "object", test.offset, test.length, test.data, file.Checksums, test.algorithm, test.blocksize)
+			writer.Reset()
+			err = storage.ReadFile(context.Background(), writer, bitrotReaders, test.offset, test.length, test.data)
 			if err != nil && !test.shouldFailQuorum {
 				t.Errorf("Test %d: should pass but failed with: %v", i, err)
 			}
@@ -143,12 +175,6 @@ func TestErasureReadFile(t *testing.T) {
 				t.Errorf("Test %d: should fail but it passed", i)
 			}
 			if !test.shouldFailQuorum {
-				if readInfo.Size != test.length {
-					t.Errorf("Test %d: read returns wrong number of bytes: got: #%d want: #%d", i, readInfo.Size, test.length)
-				}
-				if readInfo.Algorithm != test.algorithm {
-					t.Errorf("Test %d: read returns wrong algorithm: got: %v want: %v", i, readInfo.Algorithm, test.algorithm)
-				}
 				if content := writer.Bytes(); !bytes.Equal(content, data[test.offset:test.offset+test.length]) {
 					t.Errorf("Test %d: read retruns wrong file content", i)
 				}
@@ -174,8 +200,8 @@ func TestErasureReadFileRandomOffsetLength(t *testing.T) {
 		return
 	}
 	defer setup.Remove()
-
-	storage, err := NewErasureStorage(context.Background(), setup.disks, dataBlocks, parityBlocks, blockSize)
+	disks := setup.disks
+	storage, err := NewErasureStorage(context.Background(), dataBlocks, parityBlocks, blockSize)
 	if err != nil {
 		t.Fatalf("failed to create ErasureStorage: %v", err)
 	}
@@ -187,17 +213,25 @@ func TestErasureReadFileRandomOffsetLength(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	writers := make([]*bitrotWriter, len(disks))
+	for i, disk := range disks {
+		if disk == nil {
+			continue
+		}
+		writers[i] = newBitrotWriter(disk, "testbucket", "object", DefaultBitrotAlgorithm)
+	}
+
 	// 10000 iterations with random offsets and lengths.
 	iterations := 10000
 
 	// Create a test file to read from.
 	buffer := make([]byte, blockSize, 2*blockSize)
-	file, err := storage.CreateFile(context.Background(), bytes.NewReader(data), "testbucket", "testobject", buffer, DefaultBitrotAlgorithm, dataBlocks+1)
+	n, err := storage.CreateFile(context.Background(), bytes.NewReader(data), writers, buffer, storage.dataBlocks+1)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if file.Size != length {
-		t.Errorf("erasureCreateFile returned %d, expected %d", file.Size, length)
+	if n != length {
+		t.Errorf("erasureCreateFile returned %d, expected %d", n, length)
 	}
 
 	// To generate random offset/length.
@@ -212,7 +246,16 @@ func TestErasureReadFileRandomOffsetLength(t *testing.T) {
 
 		expected := data[offset : offset+readLen]
 
-		_, err = storage.ReadFile(context.Background(), buf, "testbucket", "testobject", offset, readLen, length, file.Checksums, DefaultBitrotAlgorithm, blockSize)
+		// Get the checksums of the current part.
+		bitrotReaders := make([]*bitrotReader, len(disks))
+		for index, disk := range disks {
+			if disk == OfflineDisk {
+				continue
+			}
+			endOffset := getErasureShardFileEndOffset(offset, readLen, length, blockSize, storage.dataBlocks)
+			bitrotReaders[index] = newBitrotReader(disk, "testbucket", "object", DefaultBitrotAlgorithm, endOffset, writers[index].Sum())
+		}
+		err = storage.ReadFile(context.Background(), buf, bitrotReaders, offset, readLen, length)
 		if err != nil {
 			t.Fatal(err, offset, readLen)
 		}
@@ -232,31 +275,47 @@ func benchmarkErasureRead(data, parity, dataDown, parityDown int, size int64, b
 		b.Fatalf("failed to create test setup: %v", err)
 	}
 	defer setup.Remove()
-	storage, err := NewErasureStorage(context.Background(), setup.disks, data, parity, blockSizeV1)
+	disks := setup.disks
+	storage, err := NewErasureStorage(context.Background(), data, parity, blockSizeV1)
 	if err != nil {
 		b.Fatalf("failed to create ErasureStorage: %v", err)
 	}
 
+	writers := make([]*bitrotWriter, len(disks))
+	for i, disk := range disks {
+		if disk == nil {
+			continue
+		}
+		writers[i] = newBitrotWriter(disk, "testbucket", "object", DefaultBitrotAlgorithm)
+	}
+
 	content := make([]byte, size)
 	buffer := make([]byte, blockSizeV1, 2*blockSizeV1)
-	file, err := storage.CreateFile(context.Background(), bytes.NewReader(content), "testbucket", "object", buffer, DefaultBitrotAlgorithm, data+1)
+	_, err = storage.CreateFile(context.Background(), bytes.NewReader(content), writers, buffer, storage.dataBlocks+1)
 	if err != nil {
 		b.Fatalf("failed to create erasure test file: %v", err)
 	}
-	checksums := file.Checksums
 
 	for i := 0; i < dataDown; i++ {
-		storage.disks[i] = OfflineDisk
+		writers[i] = nil
 	}
 	for i := data; i < data+parityDown; i++ {
-		storage.disks[i] = OfflineDisk
+		writers[i] = nil
 	}
 
 	b.ResetTimer()
 	b.SetBytes(size)
 	b.ReportAllocs()
 	for i := 0; i < b.N; i++ {
-		if file, err = storage.ReadFile(context.Background(), bytes.NewBuffer(content[:0]), "testbucket", "object", 0, size, size, checksums, DefaultBitrotAlgorithm, blockSizeV1); err != nil {
+		bitrotReaders := make([]*bitrotReader, len(disks))
+		for index, disk := range disks {
+			if writers[index] == nil {
+				continue
+			}
+			endOffset := getErasureShardFileEndOffset(0, size, size, storage.blockSize, storage.dataBlocks)
+			bitrotReaders[index] = newBitrotReader(disk, "testbucket", "object", DefaultBitrotAlgorithm, endOffset, writers[index].Sum())
+		}
+		if err = storage.ReadFile(context.Background(), bytes.NewBuffer(content[:0]), bitrotReaders, 0, size, size); err != nil {
 			panic(err)
 		}
 	}

cmd/erasure-utils.go

@@ -104,3 +104,25 @@ func writeDataBlocks(ctx context.Context, dst io.Writer, enBlocks [][]byte, data
 	// Success.
 	return totalWritten, nil
 }
+
+// Returns shard-file size.
+func getErasureShardFileSize(blockSize int64, totalLength int64, dataBlocks int) int64 {
+	shardSize := ceilFrac(int64(blockSize), int64(dataBlocks))
+	numShards := totalLength / int64(blockSize)
+	lastBlockSize := totalLength % int64(blockSize)
+	lastShardSize := ceilFrac(lastBlockSize, int64(dataBlocks))
+	return shardSize*numShards + lastShardSize
+}
+
+// Returns the endOffset till which bitrotReader should read data using disk.ReadFile()
+// partOffset, partLength and partSize are values of the object's part file.
+func getErasureShardFileEndOffset(partOffset int64, partLength int64, partSize int64, erasureBlockSize int64, dataBlocks int) int64 {
+	shardSize := ceilFrac(erasureBlockSize, int64(dataBlocks))
+	shardFileSize := getErasureShardFileSize(erasureBlockSize, partSize, dataBlocks)
+	endShard := (partOffset + int64(partLength)) / erasureBlockSize
+	endOffset := endShard*shardSize + shardSize
+	if endOffset > shardFileSize {
+		endOffset = shardFileSize
+	}
+	return endOffset
+}

cmd/erasure.go

@@ -18,8 +18,6 @@ package cmd
 
 import (
 	"context"
-	"crypto/subtle"
-	"hash"
 
 	"github.com/klauspost/reedsolomon"
 	"github.com/minio/minio/cmd/logger"
@@ -28,43 +26,36 @@ import (
 // OfflineDisk represents an unavailable disk.
 var OfflineDisk StorageAPI // zero value is nil
 
-// ErasureFileInfo contains information about an erasure file operation (create, read, heal).
-type ErasureFileInfo struct {
-	Size      int64
-	Algorithm BitrotAlgorithm
-	Checksums [][]byte
-}
-
-// ErasureStorage represents an array of disks.
-// The disks contain erasure coded and bitrot-protected data.
+// ErasureStorage - erasure encoding details.
 type ErasureStorage struct {
-	disks                    []StorageAPI
 	erasure                  reedsolomon.Encoder
 	dataBlocks, parityBlocks int
+	blockSize                int64
 }
 
-// NewErasureStorage creates a new ErasureStorage. The storage erasure codes and protects all data written to
-// the disks.
-func NewErasureStorage(ctx context.Context, disks []StorageAPI, dataBlocks, parityBlocks int, blockSize int64) (s ErasureStorage, err error) {
-	shardsize := (int(blockSize) + dataBlocks - 1) / dataBlocks
+// NewErasureStorage creates a new ErasureStorage.
+func NewErasureStorage(ctx context.Context, dataBlocks, parityBlocks int, blockSize int64) (s ErasureStorage, err error) {
+	shardsize := int(ceilFrac(blockSize, int64(dataBlocks)))
 	erasure, err := reedsolomon.New(dataBlocks, parityBlocks, reedsolomon.WithAutoGoroutines(shardsize))
 	if err != nil {
 		logger.LogIf(ctx, err)
 		return s, err
 	}
 	s = ErasureStorage{
-		disks:        make([]StorageAPI, len(disks)),
 		erasure:      erasure,
 		dataBlocks:   dataBlocks,
 		parityBlocks: parityBlocks,
+		blockSize:    blockSize,
 	}
-	copy(s.disks, disks)
 	return
 }
 
 // ErasureEncode encodes the given data and returns the erasure-coded data.
 // It returns an error if the erasure coding failed.
 func (s *ErasureStorage) ErasureEncode(ctx context.Context, data []byte) ([][]byte, error) {
+	if len(data) == 0 {
+		return make([][]byte, s.dataBlocks+s.parityBlocks), nil
+	}
 	encoded, err := s.erasure.Split(data)
 	if err != nil {
 		logger.LogIf(ctx, err)
@@ -81,6 +72,16 @@ func (s *ErasureStorage) ErasureEncode(ctx context.Context, data []byte) ([][]by
 // It only decodes the data blocks but does not verify them.
 // It returns an error if the decoding failed.
 func (s *ErasureStorage) ErasureDecodeDataBlocks(data [][]byte) error {
+	needsReconstruction := false
+	for _, b := range data[:s.dataBlocks] {
+		if b == nil {
+			needsReconstruction = true
+			break
+		}
+	}
+	if !needsReconstruction {
+		return nil
+	}
 	if err := s.erasure.ReconstructData(data); err != nil {
 		return err
 	}
@@ -96,27 +97,3 @@ func (s *ErasureStorage) ErasureDecodeDataAndParityBlocks(ctx context.Context, d
 	}
 	return nil
 }
-
-// NewBitrotVerifier returns a new BitrotVerifier implementing the given algorithm.
-func NewBitrotVerifier(algorithm BitrotAlgorithm, checksum []byte) *BitrotVerifier {
-	return &BitrotVerifier{algorithm.New(), algorithm, checksum, false}
-}
-
-// BitrotVerifier can be used to verify protected data.
-type BitrotVerifier struct {
-	hash.Hash
-
-	algorithm BitrotAlgorithm
-	sum       []byte
-	verified  bool
-}
-
-// Verify returns true iff the computed checksum of the verifier matches the the checksum provided when the verifier
-// was created.
-func (v *BitrotVerifier) Verify() bool {
-	v.verified = true
-	return subtle.ConstantTimeCompare(v.Sum(nil), v.sum) == 1
-}
-
-// IsVerified returns true iff Verify was called at least once.
-func (v *BitrotVerifier) IsVerified() bool { return v.verified }

cmd/erasure_test.go

@@ -52,8 +52,7 @@ func TestErasureDecode(t *testing.T) {
 		buffer := make([]byte, len(data), 2*len(data))
 		copy(buffer, data)
 
-		disks := make([]StorageAPI, test.dataBlocks+test.parityBlocks)
-		storage, err := NewErasureStorage(context.Background(), disks, test.dataBlocks, test.parityBlocks, blockSizeV1)
+		storage, err := NewErasureStorage(context.Background(), test.dataBlocks, test.parityBlocks, blockSizeV1)
 		if err != nil {
 			t.Fatalf("Test %d: failed to create erasure storage: %v", i, err)
 		}

cmd/format-fs.go

@@ -24,6 +24,7 @@ import (
 	"path"
 	"time"
 
+	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/lock"
 )
 
@@ -55,24 +56,22 @@ type formatFSVersionDetect struct {
 	} `json:"fs"`
 }
 
+// Generic structure to manage both v1 and v2 structures
+type formatFS struct {
+	formatMetaV1
+	FS interface{} `json:"fs"`
+}
+
 // Returns the latest "fs" format V1
 func newFormatFSV1() (format *formatFSV1) {
 	f := &formatFSV1{}
 	f.Version = formatMetaVersionV1
 	f.Format = formatBackendFS
+	f.ID = mustGetUUID()
 	f.FS.Version = formatFSVersionV1
 	return f
 }
 
-// Returns the latest "fs" format V2
-func newFormatFSV2() (format *formatFSV2) {
-	f := &formatFSV2{}
-	f.Version = formatMetaVersionV1
-	f.Format = formatBackendFS
-	f.FS.Version = formatFSVersionV2
-	return f
-}
-
 // Returns the field formatMetaV1.Format i.e the string "fs" which is never likely to change.
 // We do not use this function in XL to get the format as the file is not fcntl-locked on XL.
 func formatMetaGetFormatBackendFS(r io.ReadSeeker) (string, error) {
@@ -115,7 +114,16 @@ func formatFSMigrateV1ToV2(ctx context.Context, wlk *lock.LockedFile, fsPath str
 		return err
 	}
 
-	return jsonSave(wlk.File, newFormatFSV2())
+	formatV1 := formatFSV1{}
+	if err = jsonLoad(wlk, &formatV1); err != nil {
+		return err
+	}
+
+	formatV2 := formatFSV2{}
+	formatV2.formatMetaV1 = formatV1.formatMetaV1
+	formatV2.FS.Version = formatFSVersionV2
+
+	return jsonSave(wlk.File, formatV2)
 }
 
 // Migrate the "fs" backend.
@@ -179,6 +187,12 @@ func createFormatFS(ctx context.Context, fsFormatPath string) error {
 // migrate the backend when we are actively working on the backend.
 func initFormatFS(ctx context.Context, fsPath string) (rlk *lock.RLockedFile, err error) {
 	fsFormatPath := pathJoin(fsPath, minioMetaBucket, formatConfigFile)
+
+	// Add a deployment ID, if it does not exist.
+	if err := formatFSFixDeploymentID(fsFormatPath); err != nil {
+		return nil, err
+	}
+
 	// Any read on format.json should be done with read-lock.
 	// Any write on format.json should be done with write-lock.
 	for {
@@ -235,7 +249,8 @@ func initFormatFS(ctx context.Context, fsPath string) (rlk *lock.RLockedFile, er
 			rlk.Close()
 			// Hold write lock during migration so that we do not disturb any
 			// minio processes running in parallel.
-			wlk, err := lock.TryLockedOpenFile(fsFormatPath, os.O_RDWR, 0)
+			var wlk *lock.LockedFile
+			wlk, err = lock.TryLockedOpenFile(fsFormatPath, os.O_RDWR, 0)
 			if err == lock.ErrAlreadyLocked {
 				// Lock already present, sleep and attempt again.
 				time.Sleep(100 * time.Millisecond)
@@ -253,7 +268,94 @@ func initFormatFS(ctx context.Context, fsPath string) (rlk *lock.RLockedFile, er
 			// Successfully migrated, now try to hold a read-lock on format.json
 			continue
 		}
-
+		var id string
+		if id, err = formatFSGetDeploymentID(rlk); err != nil {
+			rlk.Close()
+			return nil, err
+		}
+		logger.SetDeploymentID(id)
 		return rlk, nil
 	}
 }
+
+func formatFSGetDeploymentID(rlk *lock.RLockedFile) (id string, err error) {
+	format := &formatFS{}
+	if err := jsonLoad(rlk, format); err != nil {
+		return "", err
+	}
+	return format.ID, nil
+}
+
+// Generate a deployment ID if one does not exist already.
+func formatFSFixDeploymentID(fsFormatPath string) error {
+	rlk, err := lock.RLockedOpenFile(fsFormatPath)
+	if err == nil {
+		// format.json can be empty in a rare condition when another
+		// minio process just created the file but could not hold lock
+		// and write to it.
+		var fi os.FileInfo
+		fi, err = rlk.Stat()
+		if err != nil {
+			rlk.Close()
+			return err
+		}
+		if fi.Size() == 0 {
+			rlk.Close()
+			return nil
+		}
+	}
+	if os.IsNotExist(err) {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+
+	formatBackend, err := formatMetaGetFormatBackendFS(rlk)
+	if err != nil {
+		rlk.Close()
+		return err
+	}
+	if formatBackend != formatBackendFS {
+		rlk.Close()
+		return fmt.Errorf(`%s file: expected format-type: %s, found: %s`, formatConfigFile, formatBackendFS, formatBackend)
+	}
+
+	format := &formatFS{}
+	err = jsonLoad(rlk, format)
+	rlk.Close()
+	if err != nil {
+		return err
+	}
+
+	// Check if it needs to be updated
+	if format.ID != "" {
+		return nil
+	}
+
+	for {
+		wlk, err := lock.TryLockedOpenFile(fsFormatPath, os.O_RDWR, 0)
+		if err == lock.ErrAlreadyLocked {
+			// Lock already present, sleep and attempt again.
+			time.Sleep(100 * time.Millisecond)
+			continue
+		}
+		if err != nil {
+			return err
+		}
+		defer wlk.Close()
+
+		err = jsonLoad(wlk, format)
+		if err != nil {
+			return err
+		}
+
+		// Check if it needs to be updated
+		if format.ID != "" {
+			return nil
+		}
+		format.ID = mustGetUUID()
+		return jsonSave(wlk, format)
+	}
+
+}

cmd/format-meta.go

@@ -49,4 +49,6 @@ type formatMetaV1 struct {
 	Version string `json:"version"`
 	// Format indicates the backend format type, supports two values 'xl' and 'fs'.
 	Format string `json:"format"`
+	// ID is the identifier for the minio deployment
+	ID string `json:"id"`
 }

cmd/format-xl.go

@@ -21,12 +21,13 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
-	"os"
+	"reflect"
 	"sync"
 
 	"encoding/hex"
 
 	humanize "github.com/dustin/go-humanize"
+	"github.com/minio/minio/cmd/logger"
 	sha256 "github.com/minio/sha256-simd"
 )
 
@@ -86,10 +87,11 @@ type formatXLV1 struct {
 // Represents the V2 backend disk structure version
 // under `.minio.sys` and actual data namespace.
 // formatXLV2 - structure holds format config version '2'.
+// The V2 format to support "large bucket" support where a bucket
+// can span multiple erasure sets.
 type formatXLV2 struct {
-	Version string `json:"version"`
-	Format  string `json:"format"`
-	XL      struct {
+	formatMetaV1
+	XL struct {
 		Version string `json:"version"` // Version of 'xl' format.
 		This    string `json:"this"`    // This field carries assigned disk uuid.
 		// Sets field carries the input disk order generated the first
@@ -107,9 +109,8 @@ type formatXLV2 struct {
 // In .minio.sys/multipart we have:
 // sha256(bucket/object)/uploadID/[xl.json, part.1, part.2 ....]
 type formatXLV3 struct {
-	Version string `json:"version"`
-	Format  string `json:"format"`
-	XL      struct {
+	formatMetaV1
+	XL struct {
 		Version string `json:"version"` // Version of 'xl' format.
 		This    string `json:"this"`    // This field carries assigned disk uuid.
 		// Sets field carries the input disk order generated the first
@@ -127,6 +128,7 @@ func newFormatXLV3(numSets int, setLen int) *formatXLV3 {
 	format := &formatXLV3{}
 	format.Version = formatMetaVersionV1
 	format.Format = formatBackendXL
+	format.ID = mustGetUUID()
 	format.XL.Version = formatXLVersionV3
 	format.XL.DistributionAlgo = formatXLVersionV2DistributionAlgo
 	format.XL.Sets = make([][]string, numSets)
@@ -264,10 +266,11 @@ func formatXLMigrateV2ToV3(export string) error {
 		return err
 	}
 
-	if err = os.RemoveAll(pathJoin(export, minioMetaMultipartBucket)); err != nil {
+	if err = removeAll(pathJoin(export, minioMetaMultipartBucket)); err != nil {
 		return err
 	}
-	if err = os.MkdirAll(pathJoin(export, minioMetaMultipartBucket), 0755); err != nil {
+
+	if err = mkdirAll(pathJoin(export, minioMetaMultipartBucket), 0755); err != nil {
 		return err
 	}
 
@@ -443,6 +446,112 @@ func checkFormatXLValues(formats []*formatXLV3) error {
 	return nil
 }
 
+// Get Deployment ID for the XL sets from format.json.
+// This need not be in quorum. Even if one of the format.json
+// file has this value, we assume it is valid.
+// If more than one format.json's have different id, it is considered a corrupt
+// backend format.
+func formatXLGetDeploymentID(refFormat *formatXLV3, formats []*formatXLV3) (string, error) {
+	var deploymentID string
+	for _, format := range formats {
+		if format == nil || format.ID == "" {
+			continue
+		}
+		if reflect.DeepEqual(format.XL.Sets, refFormat.XL.Sets) {
+			// Found an ID in one of the format.json file
+			// Set deploymentID for the first time.
+			if deploymentID == "" {
+				deploymentID = format.ID
+			} else if deploymentID != format.ID {
+				// DeploymentID found earlier doesn't match with the
+				// current format.json's ID.
+				return "", errCorruptedFormat
+			}
+		}
+	}
+	return deploymentID, nil
+}
+
+// formatXLFixDeploymentID - Add deployment id if it is not present.
+func formatXLFixDeploymentID(ctx context.Context, storageDisks []StorageAPI, refFormat *formatXLV3) (err error) {
+	// Acquire lock on format.json
+	mutex := newNSLock(globalIsDistXL)
+	formatLock := mutex.NewNSLock(minioMetaBucket, formatConfigFile)
+	if err = formatLock.GetLock(globalHealingTimeout); err != nil {
+		return err
+	}
+	defer formatLock.Unlock()
+
+	// Attempt to load all `format.json` from all disks.
+	var sErrs []error
+	formats, sErrs := loadFormatXLAll(storageDisks)
+	for i, sErr := range sErrs {
+		if _, ok := formatCriticalErrors[sErr]; ok {
+			return fmt.Errorf("Disk %s: %s", globalEndpoints[i], sErr)
+		}
+	}
+
+	for index := range formats {
+		// If the XL sets do not match, set those formats to nil,
+		// We do not have to update the ID on those format.json file.
+		if formats[index] != nil && !reflect.DeepEqual(formats[index].XL.Sets, refFormat.XL.Sets) {
+			formats[index] = nil
+		}
+	}
+	refFormat.ID, err = formatXLGetDeploymentID(refFormat, formats)
+	if err != nil {
+		return err
+	}
+
+	// If ID is set, then some other node got the lock
+	// before this node could and generated an ID
+	// for the deployment. No need to generate one.
+	if refFormat.ID != "" {
+		return nil
+	}
+
+	// ID is generated for the first time,
+	// We set the ID in all the formats and update.
+	refFormat.ID = mustGetUUID()
+	for _, format := range formats {
+		if format != nil {
+			format.ID = refFormat.ID
+		}
+	}
+	// Deployment ID needs to be set on all the disks.
+	// Save `format.json` across all disks.
+	return saveFormatXLAll(ctx, storageDisks, formats)
+
+}
+
+// Update only the valid local disks which have not been updated before.
+func formatXLFixLocalDeploymentID(ctx context.Context, storageDisks []StorageAPI, refFormat *formatXLV3) error {
+	// If this server was down when the deploymentID was updated
+	// then we make sure that we update the local disks with the deploymentID.
+	for index, storageDisk := range storageDisks {
+		if globalEndpoints[index].IsLocal && storageDisk != nil && storageDisk.IsOnline() {
+			format, err := loadFormatXL(storageDisk)
+			if err != nil {
+				// Disk can be offline etc.
+				// ignore the errors seen here.
+				continue
+			}
+			if format.ID != "" {
+				continue
+			}
+			if !reflect.DeepEqual(format.XL.Sets, refFormat.XL.Sets) {
+				continue
+			}
+			format.ID = refFormat.ID
+			if err := saveFormatXL(storageDisk, format); err != nil {
+				logger.LogIf(ctx, err)
+				return fmt.Errorf("Unable to save format.json, %s", err)
+			}
+		}
+	}
+	return nil
+}
+
 // Get backend XL format in quorum `format.json`.
 func getFormatXLInQuorum(formats []*formatXLV3) (*formatXLV3, error) {
 	formatHashes := make([]string, len(formats))

cmd/format-xl_test.go

@@ -345,8 +345,10 @@ func TestCheckFormatXLValue(t *testing.T) {
 		// Invalid XL format version "2".
 		{
 			&formatXLV3{
-				Version: "2",
-				Format:  "XL",
+				formatMetaV1: formatMetaV1{
+					Version: "2",
+					Format:  "XL",
+				},
 				XL: struct {
 					Version          string     `json:"version"`
 					This             string     `json:"this"`
@@ -361,8 +363,10 @@ func TestCheckFormatXLValue(t *testing.T) {
 		// Invalid XL format "Unknown".
 		{
 			&formatXLV3{
-				Version: "1",
-				Format:  "Unknown",
+				formatMetaV1: formatMetaV1{
+					Version: "1",
+					Format:  "Unknown",
+				},
 				XL: struct {
 					Version          string     `json:"version"`
 					This             string     `json:"this"`
@@ -377,8 +381,10 @@ func TestCheckFormatXLValue(t *testing.T) {
 		// Invalid XL format version "0".
 		{
 			&formatXLV3{
-				Version: "1",
-				Format:  "XL",
+				formatMetaV1: formatMetaV1{
+					Version: "1",
+					Format:  "XL",
+				},
 				XL: struct {
 					Version          string     `json:"version"`
 					This             string     `json:"this"`
@@ -466,6 +472,61 @@ func TestGetFormatXLInQuorumCheck(t *testing.T) {
 	}
 }
 
+// Tests formatXLGetDeploymentID()
+func TestGetXLID(t *testing.T) {
+	setCount := 2
+	disksPerSet := 8
+
+	format := newFormatXLV3(setCount, disksPerSet)
+	formats := make([]*formatXLV3, 16)
+
+	for i := 0; i < setCount; i++ {
+		for j := 0; j < disksPerSet; j++ {
+			newFormat := *format
+			newFormat.XL.This = format.XL.Sets[i][j]
+			formats[i*disksPerSet+j] = &newFormat
+		}
+	}
+
+	// Return a format from list of formats in quorum.
+	quorumFormat, err := getFormatXLInQuorum(formats)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Check if the reference format and input formats are same.
+	var id string
+	if id, err = formatXLGetDeploymentID(quorumFormat, formats); err != nil {
+		t.Fatal(err)
+	}
+
+	if id == "" {
+		t.Fatal("ID cannot be empty.")
+	}
+
+	formats[0] = nil
+	if id, err = formatXLGetDeploymentID(quorumFormat, formats); err != nil {
+		t.Fatal(err)
+	}
+	if id == "" {
+		t.Fatal("ID cannot be empty.")
+	}
+
+	formats[1].XL.Sets[0][0] = "bad-uuid"
+	if id, err = formatXLGetDeploymentID(quorumFormat, formats); err != nil {
+		t.Fatal(err)
+	}
+
+	if id == "" {
+		t.Fatal("ID cannot be empty.")
+	}
+
+	formats[2].ID = "bad-id"
+	if id, err = formatXLGetDeploymentID(quorumFormat, formats); err != errCorruptedFormat {
+		t.Fatal("Unexpected Success")
+	}
+}
+
 // Initialize new format sets.
 func TestNewFormatSets(t *testing.T) {
 	setCount := 2

cmd/fs-v1-helpers.go

@@ -64,7 +64,7 @@ func fsRemoveAll(ctx context.Context, dirPath string) (err error) {
 		return err
 	}
 
-	if err = os.RemoveAll(dirPath); err != nil {
+	if err = removeAll(dirPath); err != nil {
 		if os.IsPermission(err) {
 			logger.LogIf(ctx, errVolumeAccessDenied)
 			return errVolumeAccessDenied
@@ -121,23 +121,25 @@ func fsMkdir(ctx context.Context, dirPath string) (err error) {
 	}
 
 	if err = os.Mkdir((dirPath), 0777); err != nil {
-		if os.IsExist(err) {
+		switch {
+		case os.IsExist(err):
 			return errVolumeExists
-		} else if os.IsPermission(err) {
+		case os.IsPermission(err):
 			logger.LogIf(ctx, errDiskAccessDenied)
 			return errDiskAccessDenied
-		} else if isSysErrNotDir(err) {
+		case isSysErrNotDir(err):
 			// File path cannot be verified since
 			// one of the parents is a file.
 			logger.LogIf(ctx, errDiskAccessDenied)
 			return errDiskAccessDenied
-		} else if isSysErrPathNotFound(err) {
+		case isSysErrPathNotFound(err):
 			// Add specific case for windows.
 			logger.LogIf(ctx, errDiskAccessDenied)
 			return errDiskAccessDenied
+		default:
+			logger.LogIf(ctx, err)
+			return err
 		}
-		logger.LogIf(ctx, err)
-		return err
 	}
 
 	return nil
@@ -178,7 +180,6 @@ func fsStatVolume(ctx context.Context, volume string) (os.FileInfo, error) {
 	}
 
 	if !fi.IsDir() {
-		logger.LogIf(ctx, errVolumeAccessDenied)
 		return nil, errVolumeAccessDenied
 	}
 
@@ -200,7 +201,7 @@ func osErrToFSFileErr(err error) error {
 		return errFileAccessDenied
 	}
 	if isSysErrNotDir(err) {
-		return errFileAccessDenied
+		return errFileNotFound
 	}
 	if isSysErrPathNotFound(err) {
 		return errFileNotFound
@@ -219,8 +220,7 @@ func fsStatDir(ctx context.Context, statDir string) (os.FileInfo, error) {
 		return nil, err
 	}
 	if !fi.IsDir() {
-		logger.LogIf(ctx, errFileAccessDenied)
-		return nil, errFileAccessDenied
+		return nil, errFileNotFound
 	}
 	return fi, nil
 }
@@ -245,8 +245,7 @@ func fsStatFile(ctx context.Context, statFile string) (os.FileInfo, error) {
 		return nil, err
 	}
 	if fi.IsDir() {
-		logger.LogIf(ctx, errFileAccessDenied)
-		return nil, errFileAccessDenied
+		return nil, errFileNotFound
 	}
 	return fi, nil
 }
@@ -346,7 +345,9 @@ func fsCreateFile(ctx context.Context, filePath string, reader io.Reader, buf []
 	if buf != nil {
 		bytesWritten, err = io.CopyBuffer(writer, reader, buf)
 		if err != nil {
-			logger.LogIf(ctx, err)
+			if err != io.ErrUnexpectedEOF {
+				logger.LogIf(ctx, err)
+			}
 			return 0, err
 		}
 	} else {

cmd/fs-v1-helpers_test.go

@@ -136,7 +136,7 @@ func TestFSStats(t *testing.T) {
 			srcFSPath:   path,
 			srcVol:      "success-vol",
 			srcPath:     "path",
-			expectedErr: errFileAccessDenied,
+			expectedErr: errFileNotFound,
 		},
 		// Test case - 6.
 		// Test case with src path segment > 255.

cmd/fs-v1-multipart.go

@@ -264,7 +264,7 @@ func (fs *FSObjects) CopyObjectPart(ctx context.Context, srcBucket, srcObject, d
 			}
 			return
 		}
-		// Close writer explicitly signalling we wrote all data.
+		// Close writer explicitly signaling we wrote all data.
 		if gerr := srcInfo.Writer.Close(); gerr != nil {
 			logger.LogIf(ctx, gerr)
 			return
@@ -543,25 +543,11 @@ func (fs *FSObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
 
 		// All parts except the last part has to be atleast 5MB.
 		if !isMinAllowedPartSize(fi.Size()) {
-			err = PartTooSmall{
+			return oi, PartTooSmall{
 				PartNumber: part.PartNumber,
 				PartSize:   fi.Size(),
 				PartETag:   part.ETag,
 			}
-			logger.LogIf(ctx, err)
-			return oi, err
-		}
-
-		// TODO: Make necessary changes in future as explained in the below comment.
-		// All parts except the last part has to be of same size. We are introducing this
-		// check to see if any clients break. If clients do not break then we can optimize
-		// multipart PutObjectPart by writing the part at the right offset using pwrite()
-		// so that we don't need to do background append at all. i.e by the time we get
-		// CompleteMultipartUpload we already have the full file available which can be
-		// renamed to the main name-space.
-		if partSize != fi.Size() {
-			logger.LogIf(ctx, PartsSizeUnequal{})
-			return oi, PartsSizeUnequal{}
 		}
 	}
 

cmd/fs-v1-multipart_test.go

@@ -90,23 +90,18 @@ func TestNewMultipartUploadFaultyDisk(t *testing.T) {
 
 // TestPutObjectPartFaultyDisk - test PutObjectPart with faulty disks
 func TestPutObjectPartFaultyDisk(t *testing.T) {
-	root, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(root)
-
 	// Prepare for tests
 	disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())
 	defer os.RemoveAll(disk)
 	obj := initFSObjects(disk, t)
+
 	fs := obj.(*FSObjects)
 	bucketName := "bucket"
 	objectName := "object"
 	data := []byte("12345")
 	dataLen := int64(len(data))
 
-	if err = obj.MakeBucketWithLocation(context.Background(), bucketName, ""); err != nil {
+	if err := obj.MakeBucketWithLocation(context.Background(), bucketName, ""); err != nil {
 		t.Fatal("Cannot create bucket, err: ", err)
 	}
 

cmd/fs-v1-rwpool.go

@@ -93,18 +93,20 @@ func (fsi *fsIOPool) Open(path string) (*lock.RLockedFile, error) {
 		// Open file for reading with read lock.
 		newRlkFile, err := lock.RLockedOpenFile(path)
 		if err != nil {
-			if os.IsNotExist(err) {
+			switch {
+			case os.IsNotExist(err):
 				return nil, errFileNotFound
-			} else if os.IsPermission(err) {
+			case os.IsPermission(err):
 				return nil, errFileAccessDenied
-			} else if isSysErrIsDir(err) {
+			case isSysErrIsDir(err):
 				return nil, errIsNotRegular
-			} else if isSysErrNotDir(err) {
+			case isSysErrNotDir(err):
 				return nil, errFileAccessDenied
-			} else if isSysErrPathNotFound(err) {
+			case isSysErrPathNotFound(err):
 				return nil, errFileNotFound
+			default:
+				return nil, err
 			}
-			return nil, err
 		}
 
 		/// Save new reader on the map.
@@ -148,14 +150,16 @@ func (fsi *fsIOPool) Write(path string) (wlk *lock.LockedFile, err error) {
 
 	wlk, err = lock.LockedOpenFile(path, os.O_RDWR, 0666)
 	if err != nil {
-		if os.IsNotExist(err) {
+		switch {
+		case os.IsNotExist(err):
 			return nil, errFileNotFound
-		} else if os.IsPermission(err) {
+		case os.IsPermission(err):
 			return nil, errFileAccessDenied
-		} else if isSysErrIsDir(err) {
+		case isSysErrIsDir(err):
 			return nil, errIsNotRegular
+		default:
+			return nil, err
 		}
-		return nil, err
 	}
 	return wlk, nil
 }
@@ -175,14 +179,16 @@ func (fsi *fsIOPool) Create(path string) (wlk *lock.LockedFile, err error) {
 	// Attempt to create the file.
 	wlk, err = lock.LockedOpenFile(path, os.O_RDWR|os.O_CREATE, 0666)
 	if err != nil {
-		if os.IsPermission(err) {
+		switch {
+		case os.IsPermission(err):
 			return nil, errFileAccessDenied
-		} else if isSysErrIsDir(err) {
+		case isSysErrIsDir(err):
 			return nil, errIsNotRegular
-		} else if isSysErrPathNotFound(err) {
+		case isSysErrPathNotFound(err):
 			return nil, errFileAccessDenied
+		default:
+			return nil, err
 		}
-		return nil, err
 	}
 
 	// Success.

cmd/fs-v1.go

@@ -34,6 +34,7 @@ import (
 	"github.com/minio/minio/pkg/lock"
 	"github.com/minio/minio/pkg/madmin"
 	"github.com/minio/minio/pkg/mimedb"
+	"github.com/minio/minio/pkg/mountinfo"
 	"github.com/minio/minio/pkg/policy"
 )
 
@@ -44,8 +45,6 @@ var defaultEtag = "00000000000000000000000000000000-1"
 type FSObjects struct {
 	// Disk usage metrics
 	totalUsed uint64 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
-	// Disk usage running routine
-	usageRunning int32 // ref: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
 
 	// Path to be exported over S3 API.
 	fsPath string
@@ -64,6 +63,8 @@ type FSObjects struct {
 	// ListObjects pool management.
 	listPool *treeWalkPool
 
+	diskMount bool
+
 	appendFileMap   map[string]*fsAppendFile
 	appendFileMapMu sync.Mutex
 
@@ -109,6 +110,9 @@ func NewFSObjectLayer(fsPath string) (ObjectLayer, error) {
 
 	var err error
 	if fsPath, err = getValidPath(fsPath); err != nil {
+		if err == errMinDiskSize {
+			return nil, err
+		}
 		return nil, uiErrUnableToWriteInBackend(err)
 	}
 
@@ -138,6 +142,7 @@ func NewFSObjectLayer(fsPath string) (ObjectLayer, error) {
 		nsMutex:       newNSLock(false),
 		listPool:      newTreeWalkPool(globalLookupTimeout),
 		appendFileMap: make(map[string]*fsAppendFile),
+		diskMount:     mountinfo.IsLikelyMountPoint(fsPath),
 	}
 
 	// Once the filesystem has initialized hold the read lock for
@@ -146,17 +151,10 @@ func NewFSObjectLayer(fsPath string) (ObjectLayer, error) {
 	// or cause changes on backend format.
 	fs.fsFormatRlk = rlk
 
-	// Initialize notification system.
-	if err = globalNotificationSys.Init(fs); err != nil {
-		return nil, uiErrUnableToReadFromBackend(err).Msg("Unable to initialize notification system")
+	if !fs.diskMount {
+		go fs.diskUsage(globalServiceDoneCh)
 	}
 
-	// Initialize policy system.
-	if err = globalPolicySys.Init(fs); err != nil {
-		return nil, uiErrUnableToReadFromBackend(err).Msg("Unable to initialize policy system")
-	}
-
-	go fs.diskUsage(globalServiceDoneCh)
 	go fs.cleanupStaleMultipartUploads(ctx, globalMultipartCleanupInterval, globalMultipartExpiry, globalServiceDoneCh)
 
 	// Return successfully initialized object layer.
@@ -173,32 +171,40 @@ func (fs *FSObjects) Shutdown(ctx context.Context) error {
 
 // diskUsage returns du information for the posix path, in a continuous routine.
 func (fs *FSObjects) diskUsage(doneCh chan struct{}) {
-	ticker := time.NewTicker(globalUsageCheckInterval)
-	defer ticker.Stop()
-
 	usageFn := func(ctx context.Context, entry string) error {
-		var fi os.FileInfo
-		var err error
-		if hasSuffix(entry, slashSeparator) {
-			fi, err = fsStatDir(ctx, entry)
-		} else {
-			fi, err = fsStatFile(ctx, entry)
+		if globalHTTPServer != nil {
+			// Wait at max 1 minute for an inprogress request
+			// before proceeding to count the usage.
+			waitCount := 60
+			// Any requests in progress, delay the usage.
+			for globalHTTPServer.GetRequestCount() > 0 && waitCount > 0 {
+				waitCount--
+				time.Sleep(1 * time.Second)
+			}
 		}
-		if err != nil {
-			return err
+
+		select {
+		case <-doneCh:
+			return errWalkAbort
+		default:
+			var fi os.FileInfo
+			var err error
+			if hasSuffix(entry, slashSeparator) {
+				fi, err = fsStatDir(ctx, entry)
+			} else {
+				fi, err = fsStatFile(ctx, entry)
+			}
+			if err != nil {
+				return err
+			}
+			atomic.AddUint64(&fs.totalUsed, uint64(fi.Size()))
 		}
-		atomic.AddUint64(&fs.totalUsed, uint64(fi.Size()))
 		return nil
 	}
 
-	// Check if disk usage routine is running, if yes then return.
-	if atomic.LoadInt32(&fs.usageRunning) == 1 {
-		return
-	}
-	atomic.StoreInt32(&fs.usageRunning, 1)
-	defer atomic.StoreInt32(&fs.usageRunning, 0)
-
-	if err := getDiskUsage(context.Background(), fs.fsPath, usageFn); err != nil {
+	// Return this routine upon errWalkAbort, continue for any other error on purpose
+	// so that we can start the routine freshly in another 12 hours.
+	if err := getDiskUsage(context.Background(), fs.fsPath, usageFn); err == errWalkAbort {
 		return
 	}
 
@@ -206,15 +212,20 @@ func (fs *FSObjects) diskUsage(doneCh chan struct{}) {
 		select {
 		case <-doneCh:
 			return
-		case <-ticker.C:
-			// Check if disk usage routine is running, if yes let it finish.
-			if atomic.LoadInt32(&fs.usageRunning) == 1 {
-				continue
-			}
-			atomic.StoreInt32(&fs.usageRunning, 1)
-
+		case <-time.After(globalUsageCheckInterval):
 			var usage uint64
 			usageFn = func(ctx context.Context, entry string) error {
+				if globalHTTPServer != nil {
+					// Wait at max 1 minute for an inprogress request
+					// before proceeding to count the usage.
+					waitCount := 60
+					// Any requests in progress, delay the usage.
+					for globalHTTPServer.GetRequestCount() > 0 && waitCount > 0 {
+						waitCount--
+						time.Sleep(1 * time.Second)
+					}
+				}
+
 				var fi os.FileInfo
 				var err error
 				if hasSuffix(entry, slashSeparator) {
@@ -230,11 +241,8 @@ func (fs *FSObjects) diskUsage(doneCh chan struct{}) {
 			}
 
 			if err := getDiskUsage(context.Background(), fs.fsPath, usageFn); err != nil {
-				atomic.StoreInt32(&fs.usageRunning, 0)
 				continue
 			}
-
-			atomic.StoreInt32(&fs.usageRunning, 0)
 			atomic.StoreUint64(&fs.totalUsed, usage)
 		}
 	}
@@ -242,25 +250,21 @@ func (fs *FSObjects) diskUsage(doneCh chan struct{}) {
 
 // StorageInfo - returns underlying storage statistics.
 func (fs *FSObjects) StorageInfo(ctx context.Context) StorageInfo {
+	di, err := getDiskInfo(fs.fsPath)
+	if err != nil {
+		return StorageInfo{}
+	}
+	used := di.Total - di.Free
+	if !fs.diskMount {
+		used = atomic.LoadUint64(&fs.totalUsed)
+	}
 	storageInfo := StorageInfo{
-		Used: atomic.LoadUint64(&fs.totalUsed),
+		Used: used,
 	}
 	storageInfo.Backend.Type = FS
 	return storageInfo
 }
 
-// Locking operations
-
-// ListLocks - List namespace locks held in object layer
-func (fs *FSObjects) ListLocks(ctx context.Context, bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
-	return []VolumeLockInfo{}, NotImplemented{}
-}
-
-// ClearLocks - Clear namespace locks held in object layer
-func (fs *FSObjects) ClearLocks(ctx context.Context, info []VolumeLockInfo) error {
-	return NotImplemented{}
-}
-
 /// Bucket operations
 
 // getBucketDir - will convert incoming bucket names to
@@ -479,7 +483,7 @@ func (fs *FSObjects) CopyObject(ctx context.Context, srcBucket, srcObject, dstBu
 			}
 			return
 		}
-		// Close writer explicitly signalling we wrote all data.
+		// Close writer explicitly signaling we wrote all data.
 		if gerr := srcInfo.Writer.Close(); gerr != nil {
 			logger.LogIf(ctx, gerr)
 			return
@@ -695,7 +699,7 @@ func (fs *FSObjects) getObjectInfoWithLock(ctx context.Context, bucket, object s
 	}
 
 	if _, err := fs.statBucketDir(ctx, bucket); err != nil {
-		return oi, toObjectErr(err, bucket)
+		return oi, err
 	}
 
 	if strings.HasSuffix(object, slashSeparator) && !fs.isObjectDir(bucket, object) {
@@ -952,13 +956,15 @@ func (fs *FSObjects) DeleteObject(ctx context.Context, bucket, object string) er
 // is a leaf or non-leaf entry.
 func (fs *FSObjects) listDirFactory(isLeaf isLeafFunc) listDirFunc {
 	// listDir - lists all the entries at a given prefix and given entry in the prefix.
-	listDir := func(bucket, prefixDir, prefixEntry string) (entries []string, delayIsLeaf bool, err error) {
+	listDir := func(bucket, prefixDir, prefixEntry string) (entries []string, delayIsLeaf bool) {
+		var err error
 		entries, err = readDir(pathJoin(fs.fsPath, bucket, prefixDir))
 		if err != nil {
-			return nil, false, err
+			logger.LogIf(context.Background(), err)
+			return
 		}
 		entries, delayIsLeaf = filterListEntries(bucket, prefixDir, entries, prefixEntry, isLeaf)
-		return entries, delayIsLeaf, nil
+		return entries, delayIsLeaf
 	}
 
 	// Return list factory instance.
@@ -1214,7 +1220,7 @@ func (fs *FSObjects) SetBucketPolicy(ctx context.Context, bucket string, policy
 
 // GetBucketPolicy will get policy on bucket
 func (fs *FSObjects) GetBucketPolicy(ctx context.Context, bucket string) (*policy.Policy, error) {
-	return GetPolicyConfig(fs, bucket)
+	return getPolicyConfig(fs, bucket)
 }
 
 // DeleteBucketPolicy deletes all policies on bucket
@@ -1224,7 +1230,12 @@ func (fs *FSObjects) DeleteBucketPolicy(ctx context.Context, bucket string) erro
 
 // ListObjectsV2 lists all blobs in bucket filtered by prefix
 func (fs *FSObjects) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (result ListObjectsV2Info, err error) {
-	loi, err := fs.ListObjects(ctx, bucket, prefix, continuationToken, delimiter, maxKeys)
+	marker := continuationToken
+	if marker == "" {
+		marker = startAfter
+	}
+
+	loi, err := fs.ListObjects(ctx, bucket, prefix, marker, delimiter, maxKeys)
 	if err != nil {
 		return result, err
 	}

cmd/fs-v1_test.go

@@ -26,12 +26,6 @@ import (
 
 // Tests for if parent directory is object
 func TestFSParentDirIsObject(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	obj, disk, err := prepareFS()
 	if err != nil {
 		t.Fatal(err)
@@ -120,12 +114,6 @@ func TestNewFS(t *testing.T) {
 // TestFSShutdown - initialize a new FS object layer then calls
 // Shutdown to check returned results
 func TestFSShutdown(t *testing.T) {
-	rootPath, err := newTestConfig(globalMinioDefaultRegion)
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(rootPath)
-
 	bucketName := "testbucket"
 	objectName := "object"
 	// Create and return an fsObject with its path in the disk
@@ -133,6 +121,7 @@ func TestFSShutdown(t *testing.T) {
 		disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())
 		obj := initFSObjects(disk, t)
 		fs := obj.(*FSObjects)
+
 		objectContent := "12345"
 		obj.MakeBucketWithLocation(context.Background(), bucketName, "")
 		obj.PutObject(context.Background(), bucketName, objectName, mustGetHashReader(t, bytes.NewReader([]byte(objectContent)), int64(len(objectContent)), "", ""), nil)

cmd/gateway-common.go

@@ -154,6 +154,7 @@ func FromMinioClientObjectInfo(bucket string, oi minio.ObjectInfo) ObjectInfo {
 		UserDefined:     userDefined,
 		ContentType:     oi.ContentType,
 		ContentEncoding: oi.Metadata.Get("Content-Encoding"),
+		StorageClass:    oi.StorageClass,
 	}
 }
 

cmd/gateway-main.go

@@ -34,7 +34,7 @@ import (
 )
 
 func init() {
-	logger.Init(GOPATH)
+	logger.Init(GOPATH, GOROOT)
 	logger.RegisterUIError(fmtError)
 }
 
@@ -150,14 +150,25 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 
 	// Validate if we have access, secret set through environment.
 	if !globalIsEnvCreds {
-		logger.Fatal(uiErrEnvCredentialsMissing(nil), "Unable to start gateway")
+		logger.Fatal(uiErrEnvCredentialsMissingGateway(nil), "Unable to start gateway")
 	}
 
 	// Create certs path.
 	logger.FatalIf(createConfigDir(), "Unable to create configuration directories")
 
-	// Initialize gateway config.
-	initConfig()
+	// Initialize server config.
+	srvCfg := newServerConfig()
+
+	// Override any values from ENVs.
+	srvCfg.loadFromEnvs()
+
+	// Load values to cached global values.
+	srvCfg.loadToCachedConfigs()
+
+	// hold the mutex lock before a new config is assigned.
+	globalServerConfigMu.Lock()
+	globalServerConfig = srvCfg
+	globalServerConfigMu.Unlock()
 
 	// Check and load SSL certificates.
 	var err error
@@ -170,8 +181,7 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	initNSLock(false) // Enable local namespace lock.
 
 	// Create new notification system.
-	globalNotificationSys, err = NewNotificationSys(globalServerConfig, EndpointList{})
-	logger.FatalIf(err, "Unable to create new notification system")
+	globalNotificationSys = NewNotificationSys(globalServerConfig, EndpointList{})
 
 	// Create new policy system.
 	globalPolicySys = NewPolicySys()
@@ -197,7 +207,7 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		getCert = globalTLSCerts.GetCertificate
 	}
 
-	globalHTTPServer = xhttp.NewServer([]string{gatewayAddr}, registerHandlers(router, globalHandlers...), getCert)
+	globalHTTPServer = xhttp.NewServer([]string{gatewayAddr}, criticalErrorHandler{registerHandlers(router, globalHandlers...)}, getCert)
 	globalHTTPServer.UpdateBytesReadFunc = globalConnStats.incInputBytes
 	globalHTTPServer.UpdateBytesWrittenFunc = globalConnStats.incOutputBytes
 	go func() {
@@ -215,6 +225,8 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		logger.FatalIf(err, "Unable to initialize gateway backend")
 	}
 
+	go globalPolicySys.Init(newObject)
+
 	// Once endpoints are finalized, initialize the new object api.
 	globalObjLayerMutex.Lock()
 	globalObjectAPI = newObject

cmd/gateway-startup-msg_test.go

@@ -23,11 +23,14 @@ import (
 
 // Test printing Gateway common message.
 func TestPrintGatewayCommonMessage(t *testing.T) {
-	root, err := newTestConfig(globalMinioDefaultRegion)
+	obj, fsDir, err := prepareFS()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer os.RemoveAll(root)
+	defer os.RemoveAll(fsDir)
+	if err = newTestConfig(globalMinioDefaultRegion, obj); err != nil {
+		t.Fatal(err)
+	}
 
 	apiEndpoints := []string{"http://127.0.0.1:9000"}
 	printGatewayCommonMsg(apiEndpoints)
@@ -35,11 +38,14 @@ func TestPrintGatewayCommonMessage(t *testing.T) {
 
 // Test print gateway startup message.
 func TestPrintGatewayStartupMessage(t *testing.T) {
-	root, err := newTestConfig(globalMinioDefaultRegion)
+	obj, fsDir, err := prepareFS()
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer os.RemoveAll(root)
+	defer os.RemoveAll(fsDir)
+	if err = newTestConfig(globalMinioDefaultRegion, obj); err != nil {
+		t.Fatal(err)
+	}
 
 	apiEndpoints := []string{"http://127.0.0.1:9000"}
 	printGatewayStartupMessage(apiEndpoints, "azure")

cmd/gateway-unsupported.go

@@ -18,7 +18,6 @@ package cmd
 
 import (
 	"context"
-	"time"
 
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/hash"
@@ -137,20 +136,6 @@ func (a GatewayUnsupported) CopyObject(ctx context.Context, srcBucket string, sr
 	return objInfo, NotImplemented{}
 }
 
-// Locking operations
-
-// ListLocks lists namespace locks held in object layer
-func (a GatewayUnsupported) ListLocks(ctx context.Context, bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error) {
-	logger.LogIf(ctx, NotImplemented{})
-	return []VolumeLockInfo{}, NotImplemented{}
-}
-
-// ClearLocks clears namespace locks held in object layer
-func (a GatewayUnsupported) ClearLocks(ctx context.Context, info []VolumeLockInfo) error {
-	logger.LogIf(ctx, NotImplemented{})
-	return NotImplemented{}
-}
-
 // RefreshBucketPolicy refreshes cache policy with what's on disk.
 func (a GatewayUnsupported) RefreshBucketPolicy(ctx context.Context, bucket string) error {
 	logger.LogIf(ctx, NotImplemented{})

cmd/gateway/azure/gateway-azure.go

@@ -82,6 +82,7 @@ ENVIRONMENT VARIABLES:
      MINIO_CACHE_DRIVES: List of mounted drives or directories delimited by ";".
      MINIO_CACHE_EXCLUDE: List of cache exclusion patterns delimited by ";".
      MINIO_CACHE_EXPIRY: Cache expiry duration in days.
+     MINIO_CACHE_MAXUSE: Maximum permitted usage of the cache in percentage (0-100).
 
 EXAMPLES:
   1. Start minio gateway server for Azure Blob Storage backend.
@@ -100,6 +101,7 @@ EXAMPLES:
      $ export MINIO_CACHE_DRIVES="/mnt/drive1;/mnt/drive2;/mnt/drive3;/mnt/drive4"
      $ export MINIO_CACHE_EXCLUDE="bucket1/*;*.png"
      $ export MINIO_CACHE_EXPIRY=40
+     $ export MINIO_CACHE_MAXUSE=80
      $ {{.HelpName}}
 `
 
@@ -191,7 +193,6 @@ func s3MetaToAzureProperties(ctx context.Context, s3Metadata map[string]string)
 	storage.BlobProperties, error) {
 	for k := range s3Metadata {
 		if strings.Contains(k, "--") {
-			logger.LogIf(ctx, minio.UnsupportedMetadata{})
 			return storage.BlobMetadata{}, storage.BlobProperties{}, minio.UnsupportedMetadata{}
 		}
 	}
@@ -238,6 +239,8 @@ func s3MetaToAzureProperties(ctx context.Context, s3Metadata map[string]string)
 			props.ContentMD5 = v
 		case k == "Content-Type":
 			props.ContentType = v
+		case k == "Content-Language":
+			props.ContentLanguage = v
 		}
 	}
 	return blobMeta, props, nil
@@ -292,6 +295,9 @@ func azurePropertiesToS3Meta(meta storage.BlobMetadata, props storage.BlobProper
 	if props.ContentType != "" {
 		s3Metadata["Content-Type"] = props.ContentType
 	}
+	if props.ContentLanguage != "" {
+		s3Metadata["Content-Language"] = props.ContentLanguage
+	}
 	return s3Metadata
 }
 
@@ -370,18 +376,12 @@ func getAzureUploadID() (string, error) {
 // checkAzureUploadID - returns error in case of given string is upload ID.
 func checkAzureUploadID(ctx context.Context, uploadID string) (err error) {
 	if len(uploadID) != 16 {
-		logger.LogIf(ctx, minio.MalformedUploadID{
-			UploadID: uploadID,
-		})
 		return minio.MalformedUploadID{
 			UploadID: uploadID,
 		}
 	}
 
 	if _, err = hex.DecodeString(uploadID); err != nil {
-		logger.LogIf(ctx, minio.MalformedUploadID{
-			UploadID: uploadID,
-		})
 		return minio.MalformedUploadID{
 			UploadID: uploadID,
 		}
@@ -442,7 +442,6 @@ func (a *azureObjects) MakeBucketWithLocation(ctx context.Context, bucket, locat
 	// in azure documentation, so we will simply use the same function here.
 	// Ref - https://docs.microsoft.com/en-us/rest/api/storageservices/naming-and-referencing-containers--blobs--and-metadata
 	if !minio.IsValidBucketName(bucket) {
-		logger.LogIf(ctx, minio.BucketNameInvalid{Bucket: bucket})
 		return minio.BucketNameInvalid{Bucket: bucket}
 	}
 
@@ -450,7 +449,6 @@ func (a *azureObjects) MakeBucketWithLocation(ctx context.Context, bucket, locat
 	err := container.Create(&storage.CreateContainerOptions{
 		Access: storage.ContainerAccessTypePrivate,
 	})
-	logger.LogIf(ctx, err)
 	return azureToObjectError(err, bucket)
 }
 
@@ -462,7 +460,6 @@ func (a *azureObjects) GetBucketInfo(ctx context.Context, bucket string) (bi min
 		Prefix: bucket,
 	})
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return bi, azureToObjectError(err, bucket)
 	}
 	for _, container := range resp.Containers {
@@ -476,7 +473,6 @@ func (a *azureObjects) GetBucketInfo(ctx context.Context, bucket string) (bi min
 			} // else continue
 		}
 	}
-	logger.LogIf(ctx, minio.BucketNotFound{Bucket: bucket})
 	return bi, minio.BucketNotFound{Bucket: bucket}
 }
 
@@ -484,7 +480,6 @@ func (a *azureObjects) GetBucketInfo(ctx context.Context, bucket string) (bi min
 func (a *azureObjects) ListBuckets(ctx context.Context) (buckets []minio.BucketInfo, err error) {
 	resp, err := a.client.ListContainers(storage.ListContainersParameters{})
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return nil, azureToObjectError(err)
 	}
 	for _, container := range resp.Containers {
@@ -505,7 +500,6 @@ func (a *azureObjects) ListBuckets(ctx context.Context) (buckets []minio.BucketI
 func (a *azureObjects) DeleteBucket(ctx context.Context, bucket string) error {
 	container := a.client.GetContainerReference(bucket)
 	err := container.Delete(nil)
-	logger.LogIf(ctx, err)
 	return azureToObjectError(err, bucket)
 }
 
@@ -543,7 +537,6 @@ func (a *azureObjects) ListObjects(ctx context.Context, bucket, prefix, marker,
 			MaxResults: uint(maxKeys),
 		})
 		if err != nil {
-			logger.LogIf(ctx, err)
 			return result, azureToObjectError(err, bucket, prefix)
 		}
 
@@ -604,7 +597,7 @@ func (a *azureObjects) ListObjects(ctx context.Context, bucket, prefix, marker,
 // ListObjectsV2 - list all blobs in Azure bucket filtered by prefix
 func (a *azureObjects) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (result minio.ListObjectsV2Info, err error) {
 	marker := continuationToken
-	if startAfter != "" {
+	if marker == "" {
 		marker = startAfter
 	}
 
@@ -631,7 +624,6 @@ func (a *azureObjects) ListObjectsV2(ctx context.Context, bucket, prefix, contin
 func (a *azureObjects) GetObject(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string) error {
 	// startOffset cannot be negative.
 	if startOffset < 0 {
-		logger.LogIf(ctx, minio.InvalidRange{})
 		return azureToObjectError(minio.InvalidRange{}, bucket, object)
 	}
 
@@ -651,7 +643,6 @@ func (a *azureObjects) GetObject(ctx context.Context, bucket, object string, sta
 		})
 	}
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return azureToObjectError(err, bucket, object)
 	}
 	_, err = io.Copy(writer, rc)
@@ -666,7 +657,6 @@ func (a *azureObjects) GetObjectInfo(ctx context.Context, bucket, object string)
 	blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
 	err = blob.GetProperties(nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return objInfo, azureToObjectError(err, bucket, object)
 	}
 
@@ -692,7 +682,6 @@ func (a *azureObjects) PutObject(ctx context.Context, bucket, object string, dat
 	}
 	err = blob.CreateBlockBlobFromReader(data, nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return objInfo, azureToObjectError(err, bucket, object)
 	}
 	return a.GetObjectInfo(ctx, bucket, object)
@@ -710,7 +699,6 @@ func (a *azureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, des
 	destBlob.Metadata = azureMeta
 	err = destBlob.Copy(srcBlobURL, nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return objInfo, azureToObjectError(err, srcBucket, srcObject)
 	}
 	// Azure will copy metadata from the source object when an empty metadata map is provided.
@@ -720,14 +708,12 @@ func (a *azureObjects) CopyObject(ctx context.Context, srcBucket, srcObject, des
 		destBlob.Metadata = azureMeta
 		err = destBlob.SetMetadata(nil)
 		if err != nil {
-			logger.LogIf(ctx, err)
 			return objInfo, azureToObjectError(err, srcBucket, srcObject)
 		}
 	}
 	destBlob.Properties = props
 	err = destBlob.SetProperties(nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return objInfo, azureToObjectError(err, srcBucket, srcObject)
 	}
 	return a.GetObjectInfo(ctx, destBucket, destObject)
@@ -763,14 +749,12 @@ func (a *azureObjects) checkUploadIDExists(ctx context.Context, bucketName, obje
 	blob := a.client.GetContainerReference(bucketName).GetBlobReference(
 		getAzureMetadataObjectName(objectName, uploadID))
 	err = blob.GetMetadata(nil)
-	logger.LogIf(ctx, err)
 	err = azureToObjectError(err, bucketName, objectName)
 	oerr := minio.ObjectNotFound{
 		Bucket: bucketName,
 		Object: objectName,
 	}
 	if err == oerr {
-		logger.LogIf(ctx, minio.InvalidUploadID{UploadID: uploadID})
 		err = minio.InvalidUploadID{
 			UploadID: uploadID,
 		}
@@ -796,7 +780,6 @@ func (a *azureObjects) NewMultipartUpload(ctx context.Context, bucket, object st
 	blob := a.client.GetContainerReference(bucket).GetBlobReference(metadataObject)
 	err = blob.CreateBlockBlobFromReader(bytes.NewBuffer(jsonData), nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return "", azureToObjectError(err, bucket, metadataObject)
 	}
 
@@ -833,7 +816,6 @@ func (a *azureObjects) PutObjectPart(ctx context.Context, bucket, object, upload
 		blob := a.client.GetContainerReference(bucket).GetBlobReference(object)
 		err = blob.PutBlockWithLength(id, uint64(subPartSize), io.LimitReader(data, subPartSize), nil)
 		if err != nil {
-			logger.LogIf(ctx, err)
 			return info, azureToObjectError(err, bucket, object)
 		}
 		subPartNumber++
@@ -865,7 +847,6 @@ func (a *azureObjects) ListObjectParts(ctx context.Context, bucket, object, uplo
 		return result, nil
 	}
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return result, azureToObjectError(err, bucket, object)
 	}
 	// Build a sorted list of parts and return the requested entries.
@@ -875,7 +856,6 @@ func (a *azureObjects) ListObjectParts(ctx context.Context, bucket, object, uplo
 		var parsedUploadID string
 		var md5Hex string
 		if partNumber, _, parsedUploadID, md5Hex, err = azureParseBlockID(block.Name); err != nil {
-			logger.LogIf(ctx, fmt.Errorf("Unexpected error"))
 			return result, azureToObjectError(fmt.Errorf("Unexpected error"), bucket, object)
 		}
 		if parsedUploadID != uploadID {
@@ -893,7 +873,6 @@ func (a *azureObjects) ListObjectParts(ctx context.Context, bucket, object, uplo
 		if part.ETag != md5Hex {
 			// If two parts of same partNumber were uploaded with different contents
 			// return error as we won't be able to decide which the latest part is.
-			logger.LogIf(ctx, fmt.Errorf("Unexpected error"))
 			return result, azureToObjectError(fmt.Errorf("Unexpected error"), bucket, object)
 		}
 		part.Size += block.Size
@@ -960,7 +939,6 @@ func (a *azureObjects) CompleteMultipartUpload(ctx context.Context, bucket, obje
 	var metadataReader io.Reader
 	blob := a.client.GetContainerReference(bucket).GetBlobReference(metadataObject)
 	if metadataReader, err = blob.Get(nil); err != nil {
-		logger.LogIf(ctx, err)
 		return objInfo, azureToObjectError(err, bucket, metadataObject)
 	}
 
@@ -984,7 +962,6 @@ func (a *azureObjects) CompleteMultipartUpload(ctx context.Context, bucket, obje
 	objBlob := a.client.GetContainerReference(bucket).GetBlobReference(object)
 	resp, err := objBlob.GetBlockList(storage.BlockListTypeUncommitted, nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return objInfo, azureToObjectError(err, bucket, object)
 	}
 
@@ -1032,11 +1009,6 @@ func (a *azureObjects) CompleteMultipartUpload(ctx context.Context, bucket, obje
 	// Error out if parts except last part sizing < 5MiB.
 	for i, size := range partSizes[:len(partSizes)-1] {
 		if size < azureS3MinPartSize {
-			logger.LogIf(ctx, minio.PartTooSmall{
-				PartNumber: uploadedParts[i].PartNumber,
-				PartSize:   size,
-				PartETag:   uploadedParts[i].ETag,
-			})
 			return objInfo, minio.PartTooSmall{
 				PartNumber: uploadedParts[i].PartNumber,
 				PartSize:   size,
@@ -1047,23 +1019,19 @@ func (a *azureObjects) CompleteMultipartUpload(ctx context.Context, bucket, obje
 
 	err = objBlob.PutBlockList(allBlocks, nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return objInfo, azureToObjectError(err, bucket, object)
 	}
 	if len(metadata.Metadata) > 0 {
 		objBlob.Metadata, objBlob.Properties, err = s3MetaToAzureProperties(ctx, metadata.Metadata)
 		if err != nil {
-			logger.LogIf(ctx, err)
 			return objInfo, azureToObjectError(err, bucket, object)
 		}
 		err = objBlob.SetProperties(nil)
 		if err != nil {
-			logger.LogIf(ctx, err)
 			return objInfo, azureToObjectError(err, bucket, object)
 		}
 		err = objBlob.SetMetadata(nil)
 		if err != nil {
-			logger.LogIf(ctx, err)
 			return objInfo, azureToObjectError(err, bucket, object)
 		}
 	}
@@ -1093,15 +1061,12 @@ func (a *azureObjects) SetBucketPolicy(ctx context.Context, bucket string, bucke
 	}
 	prefix := bucket + "/*" // For all objects inside the bucket.
 	if len(policies) != 1 {
-		logger.LogIf(ctx, minio.NotImplemented{})
 		return minio.NotImplemented{}
 	}
 	if policies[0].Prefix != prefix {
-		logger.LogIf(ctx, minio.NotImplemented{})
 		return minio.NotImplemented{}
 	}
 	if policies[0].Policy != miniogopolicy.BucketPolicyReadOnly {
-		logger.LogIf(ctx, minio.NotImplemented{})
 		return minio.NotImplemented{}
 	}
 	perm := storage.ContainerPermissions{
@@ -1110,7 +1075,6 @@ func (a *azureObjects) SetBucketPolicy(ctx context.Context, bucket string, bucke
 	}
 	container := a.client.GetContainerReference(bucket)
 	err = container.SetPermissions(perm, nil)
-	logger.LogIf(ctx, err)
 	return azureToObjectError(err, bucket)
 }
 
@@ -1119,15 +1083,12 @@ func (a *azureObjects) GetBucketPolicy(ctx context.Context, bucket string) (*pol
 	container := a.client.GetContainerReference(bucket)
 	perm, err := container.GetPermissions(nil)
 	if err != nil {
-		logger.LogIf(ctx, err)
 		return nil, azureToObjectError(err, bucket)
 	}
 
 	if perm.AccessType == storage.ContainerAccessTypePrivate {
-		logger.LogIf(ctx, minio.BucketPolicyNotFound{Bucket: bucket})
 		return nil, minio.BucketPolicyNotFound{Bucket: bucket}
 	} else if perm.AccessType != storage.ContainerAccessTypeContainer {
-		logger.LogIf(ctx, minio.NotImplemented{})
 		return nil, azureToObjectError(minio.NotImplemented{})
 	}
 
@@ -1160,6 +1121,5 @@ func (a *azureObjects) DeleteBucketPolicy(ctx context.Context, bucket string) er
 	}
 	container := a.client.GetContainerReference(bucket)
 	err := container.SetPermissions(perm, nil)
-	logger.LogIf(ctx, err)
 	return azureToObjectError(err)
 }