Fix user-agent prefix to have docker instead of suffix.

Following are the benefits of this change.
```
benchmark                           old allocs     new allocs     delta
BenchmarkPutObjectPart5MbFS-4       46172          16383          -64.52%
BenchmarkPutObjectPart10MbFS-4      36849          7223           -80.40%
BenchmarkPutObjectPart25MbFS-4      31699          3865           -87.81%
BenchmarkPutObjectPart50MbFS-4      27577          2481           -91.00%
BenchmarkPutObjectVerySmallFS-4     57             56             -1.75%
BenchmarkPutObject10KbFS-4          57             56             -1.75%
BenchmarkPutObject100KbFS-4         57             56             -1.75%
BenchmarkPutObject1MbFS-4           176            56             -68.18%
BenchmarkPutObject5MbFS-4           720            90             -87.50%
BenchmarkPutObject10MbFS-4          1400           124            -91.14%
BenchmarkPutObject25MbFS-4          3440           261            -92.41%
BenchmarkPutObject50MbFS-4          6841           466            -93.19%
```

.gitignore

@@ -14,4 +14,5 @@ vendor/**/*.js
 vendor/**/*.json
 release
 .DS_Store
-*.syso
+*.syso
+coverage.txt

.travis.yml

@@ -1,5 +1,8 @@
+go_import_path: github.com/minio/minio
 sudo: required
+
 dist: trusty
+
 language: go
 
 os:
@@ -13,12 +16,11 @@ env:
 - ARCH=i686
 
 script:
-- make test
 - make test GOFLAGS="-race"
+- make coverage
+
+after_success:
+- bash <(curl -s https://codecov.io/bash)
 
 go:
-- 1.6
-
-notifications:
-  slack:
-    secure: K9tsn5MvrCAxuEZTxn+m3Kq1K2NG2xMEJFSv/sTp+RQBW7TslPHzv859GsIvrm8mU1y1btOU9RlOzqrRUczI5cJpE8IL1oljPZbXrIXgetE0kbsw0Wpy99g27UQ2VGp933WDu8tfj7zU4cZv+BI0RltNLwqYO6GWXmcWP0IueCU=
+- 1.7.1

AWS-SDK-GO.md

@@ -1,76 +0,0 @@
-## Using aws-sdk-go with Minio
-
-aws-sdk-go is the official AWS SDK for the Go programming language. This document covers
-how to use aws-sdk-go with Minio server.
-
-### Install AWS SDK S3 service
-
-```sh
-$ go get github.com/aws/aws-sdk-go/service/s3
-```
-
-### List all buckets on Minio
-
-```go
-package main
-
-import (
-	"fmt"
-
-	"github.com/aws/aws-sdk-go/aws"
-	"github.com/aws/aws-sdk-go/aws/credentials"
-	"github.com/aws/aws-sdk-go/aws/session"
-	"github.com/aws/aws-sdk-go/service/s3"
-)
-
-func main() {
-	newSession := session.New()
-	s3Config := &aws.Config{
-		Credentials: credentials.NewStaticCredentials("<YOUR-ACCESS-KEY-ID>", "<YOUR-SECRET-ACCESS-KEY", ""),
-		Endpoint:         aws.String("http://localhost:9000"),
-		Region:           aws.String("us-east-1"),
-		DisableSSL:       aws.Bool(true),
-		S3ForcePathStyle: aws.Bool(true),
-	}
-	// Create an S3 service object in the default region.
-	s3Client := s3.New(newSession, s3Config)
-
-	cparams := &s3.CreateBucketInput{
-		Bucket: aws.String("newbucket"), // Required
-	}
-	_, err := s3Client.CreateBucket(cparams)
-	if err != nil {
-		// Message from an error.
-		fmt.Println(err.Error())
-		return
-	}
-
-	var lparams *s3.ListBucketsInput
-	// Call the ListBuckets() Operation
-	resp, err := s3Client.ListBuckets(lparams)
-	if err != nil {
-		// Message from an error.
-		fmt.Println(err.Error())
-		return
-	}
-
-	// Pretty-print the response data.
-	fmt.Println(resp)
-}
-```
-
-Populate your AccessKeyId and SecretAccessKey credentials and run the program as shown below.
-
-```sh
-$ go run aws-sdk-minio.go
-{
-  Buckets: [{
-      CreationDate: 2015-10-22 01:46:04 +0000 UTC,
-      Name: "newbucket"
-    }],
-  Owner: {
-    DisplayName: "minio",
-    ID: "minio"
-  }
-}
-```

CONTRIBUTING.md

@@ -51,7 +51,7 @@ Building Libraries
     - Push to the branch (git push origin my-new-feature)
     - Create new Pull Request
 
-* If you have additional dependencies for ``Minio``, ``Minio`` manages its depedencies using [govendor](https://github.com/kardianos/govendor)
+* If you have additional dependencies for ``Minio``, ``Minio`` manages its dependencies using [govendor](https://github.com/kardianos/govendor)
     - Run `go get foo/bar`
     - Edit your code to import foo/bar
     - Run `make pkg-add PKG=foo/bar` from top-level directory

Caddy.md

@@ -1,27 +0,0 @@
-## Setting up Proxy using Caddy.
-
-Please download [Caddy Server](https://caddyserver.com/download)
-
-Create a caddy configuration file as below, change the ip addresses according to your local
-minio and DNS configuration.
-
-```bash
-$ ./minio --address localhost:9000 server <your_export_dir>
-```
-
-```bash
-your.public.com {
-    proxy / localhost:9000 {
-        proxy_header Host {host}
-        proxy_header X-Real-IP {remote}
-        proxy_header X-Forwarded-Proto {scheme}
-    }
-}
-```
-
-```bash
-$ ./caddy
-Activating privacy features... done.
-your.public.com:443
-your.public.com:80
-```

Dockerfile

@@ -1,15 +1,17 @@
-FROM golang:1.6
+FROM golang:1.7-alpine
 
-RUN mkdir -p /go/src/app
 WORKDIR /go/src/app
 
 COPY . /go/src/app
-RUN go-wrapper download
-RUN go-wrapper install
-
-ENV ALLOW_CONTAINER_ROOT=1
-RUN mkdir -p /export/docker && cp /go/src/app/Docker.md /export/docker/
+RUN \
+	apk add --no-cache git && \
+	go-wrapper download && \
+	go-wrapper install -ldflags "-X github.com/minio/minio/cmd.Version=2016-10-14T04:00:39Z -X github.com/minio/minio/cmd.ReleaseTag=RELEASE.2016-10-14T04-00-39Z -X github.com/minio/minio/cmd.CommitID=8c59a4166865e65192e91986e8bee329851bbf7c" && \
+	mkdir -p /export/docker && \
+	cp /go/src/app/docs/Docker.md /export/docker/ && \
+	rm -rf /go/pkg /go/src && \
+	apk del git
 
 EXPOSE 9000
-ENTRYPOINT ["go-wrapper", "run", "server"]
-CMD ["/export"]
+ENTRYPOINT ["go-wrapper", "run"]
+VOLUME ["/export"]

INSTALLGO.md

@@ -1,84 +0,0 @@
-## Ubuntu (Kylin) 14.04
-### Build Dependencies
-This installation document assumes Ubuntu 14.04+ on x86-64 platform.
-
-##### Install Git, GCC
-```sh
-$ sudo apt-get install git build-essential
-```
-
-##### Install Go 1.6+
-
-Download Go 1.6+ from [https://golang.org/dl/](https://golang.org/dl/).
-
-```sh
-$ wget https://storage.googleapis.com/golang/go1.6.linux-amd64.tar.gz
-$ mkdir -p ${HOME}/bin/
-$ mkdir -p ${HOME}/go/
-$ tar -C ${HOME}/bin/ -xzf go1.6.linux-amd64.tar.gz
-```
-##### Setup GOROOT and GOPATH
-
-Add the following exports to your ``~/.bashrc``. Environment variable GOROOT specifies the location of your golang binaries
-and GOPATH specifies the location of your project workspace.
-
-```sh
-export GOROOT=${HOME}/bin/go
-export GOPATH=${HOME}/go
-export PATH=${HOME}/bin/go/bin:${GOPATH}/bin:$PATH
-```
-##### Source the new enviornment
-
-```sh
-$ source ~/.bashrc
-```
-
-##### Testing it all
-
-```sh
-$ go env
-```
-
-## OS X (Yosemite) 10.10
-### Build Dependencies
-This installation document assumes OS X Yosemite 10.10+ on x86-64 platform.
-
-##### Install brew
-```sh
-$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
-```
-
-##### Install Git, Python
-```sh
-$ brew install git python
-```
-
-##### Install Go 1.5+
-
-Install golang binaries using `brew`
-
-```sh
-$ brew install go
-$ mkdir -p $HOME/go
-```
-
-##### Setup GOROOT and GOPATH
-
-Add the following exports to your ``~/.bash_profile``. Environment variable GOROOT specifies the location of your golang binaries
-and GOPATH specifies the location of your project workspace.
-
-```sh
-export GOPATH=${HOME}/go
-export GOVERSION=$(brew list go | head -n 1 | cut -d '/' -f 6)
-export GOROOT=$(brew --prefix)/Cellar/go/${GOVERSION}/libexec
-export PATH=${GOPATH}/bin:$PATH
-```
-##### Source the new enviornment
-```sh
-$ source ~/.bash_profile
-```
-##### Testing it all
-
-```sh
-$ go env
-```

Makefile

@@ -1,8 +1,6 @@
 LDFLAGS := $(shell go run buildscripts/gen-ldflags.go)
-DOCKER_BIN := $(shell which docker)
 PWD := $(shell pwd)
 GOPATH := $(shell go env GOPATH)
-DOCKER_LDFLAGS := '$(LDFLAGS) -extldflags "-static"'
 BUILD_LDFLAGS := '$(LDFLAGS)'
 TAG := latest
 
@@ -62,10 +60,6 @@ checks:
 	@(env bash $(PWD)/buildscripts/checkdeps.sh)
 	@(env bash $(PWD)/buildscripts/checkgopath.sh)
 
-checkdocker:
-	@echo "Checking if docker is installed.. "
-	@if [ -z ${DOCKER_BIN} ]; then echo "Docker not installed, cannot build docker image. Please install 'sudo apt-get install docker.io'" && exit 1; else echo "Docker installed at ${DOCKER_BIN}."; fi;
-
 getdeps: checks
 	@go get -u github.com/golang/lint/golint && echo "Installed golint:"
 	@go get -u github.com/fzipp/gocyclo && echo "Installed gocyclo:"
@@ -77,19 +71,19 @@ verifiers: vet fmt lint cyclo spelling
 
 vet:
 	@echo "Running $@:"
-	@GO15VENDOREXPERIMENT=1 go tool vet -all *.go
+	@GO15VENDOREXPERIMENT=1 go tool vet -all ./cmd
 	@GO15VENDOREXPERIMENT=1 go tool vet -all ./pkg
-	@GO15VENDOREXPERIMENT=1 go tool vet -shadow=true *.go
+	@GO15VENDOREXPERIMENT=1 go tool vet -shadow=true ./cmd
 	@GO15VENDOREXPERIMENT=1 go tool vet -shadow=true ./pkg
 
 fmt:
 	@echo "Running $@:"
-	@GO15VENDOREXPERIMENT=1 gofmt -s -l *.go
+	@GO15VENDOREXPERIMENT=1 gofmt -s -l cmd
 	@GO15VENDOREXPERIMENT=1 gofmt -s -l pkg
 
 lint:
 	@echo "Running $@:"
-	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/golint *.go
+	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/golint github.com/minio/minio/cmd...
 	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/golint github.com/minio/minio/pkg...
 
 ineffassign:
@@ -98,7 +92,7 @@ ineffassign:
 
 cyclo:
 	@echo "Running $@:"
-	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/gocyclo -over 65 *.go
+	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/gocyclo -over 65 cmd
 	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/gocyclo -over 65 pkg
 
 build: getdeps verifiers $(UI_ASSETS)
@@ -107,14 +101,18 @@ deadcode:
 	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/deadcode
 
 spelling:
-	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/misspell *.go
-	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/misspell pkg/**/*
+	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/misspell -error cmd/**/*
+	@GO15VENDOREXPERIMENT=1 ${GOPATH}/bin/misspell -error pkg/**/*
 
 test: build
 	@echo "Running all minio testing:"
-	@GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) .
+	@GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) github.com/minio/minio/cmd...
 	@GO15VENDOREXPERIMENT=1 go test $(GOFLAGS) github.com/minio/minio/pkg...
 
+coverage: build
+	@echo "Running all coverage for minio:"
+	@GO15VENDOREXPERIMENT=1 ./buildscripts/go-coverage.sh
+
 gomake-all: build
 	@echo "Installing minio:"
 	@GO15VENDOREXPERIMENT=1 go build --ldflags $(BUILD_LDFLAGS) -o $(GOPATH)/bin/minio
@@ -133,13 +131,6 @@ pkg-list:
 
 install: gomake-all
 
-dockerimage: checkdocker getdeps verifiers $(UI_ASSETS)
-	@echo "Building docker image:" minio:$(TAG)
-	@GO15VENDOREXPERIMENT=1 GOOS=linux GOARCH=amd64 go build --ldflags $(DOCKER_LDFLAGS) -o docker/minio.dockerimage
-	@cd docker; mkdir -p export; sudo docker build --rm --tag=minio/minio:$(TAG) .
-	@rmdir docker/export
-	@rm docker/minio.dockerimage
-
 release: verifiers
 	@MINIO_RELEASE=RELEASE ./buildscripts/build.sh
 
@@ -148,8 +139,6 @@ experimental: verifiers
 
 clean:
 	@echo "Cleaning up all the generated files:"
-	@rm -fv minio minio.test cover.out
 	@find . -name '*.test' | xargs rm -fv
-	@rm -rf isa-l
 	@rm -rf build
 	@rm -rf release

README.md

@@ -1,259 +1,108 @@
-## Minio [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/minio/minio?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+# Minio Quickstart Guide [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/minio/minio?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Go Report Card](https://goreportcard.com/badge/minio/minio)](https://goreportcard.com/report/minio/minio) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/) [![codecov](https://codecov.io/gh/minio/minio/branch/master/graph/badge.svg)](https://codecov.io/gh/minio/minio)
 
-Minio is an object storage server compatible with Amazon S3 and licensed under [Apache license 2.0](./LICENSE).
+Minio is an object storage server released under Apache License v2.0. It is compatible with Amazon S3 cloud storage service. It is best suited for storing unstructured data such as photos, videos, log files, backups and container / VM images. Size of an object can range from a few KBs to a maximum of 5TB.
 
-## Description
+##  1. Download
+Minio server is light enough to be bundled with the application stack, similar to NodeJS, Redis and MySQL.
 
-Minio is an open source object storage server released under Apache License V2. It is compatible with Amazon S3 cloud storage service. Minio follows a minimalist design philosophy.
-Minio is light enough to be bundled with the application stack. It sits on the side of NodeJS, Redis, MySQL and the likes. Unlike databases, Minio stores objects such as photos, videos, log files, backups, container / VM images and so on. Minio is best suited for storing blobs of information ranging from KBs to 5 TBs each. In a simplistic sense, it is like a FTP server with a simple get / put API over HTTP.
+| Platform| Architecture | URL|
+| ----------| -------- | ------|
+|GNU/Linux|64-bit Intel|https://dl.minio.io/server/minio/release/linux-amd64/minio|
+||32-bit Intel|https://dl.minio.io/server/minio/release/linux-386/minio|
+||32-bit ARM|https://dl.minio.io/server/minio/release/linux-arm/minio|
+|Apple OS X|64-bit Intel|https://dl.minio.io/server/minio/release/darwin-amd64/minio|
+|Microsoft Windows|64-bit|https://dl.minio.io/server/minio/release/windows-amd64/minio.exe|
+||32-bit|https://dl.minio.io/server/minio/release/windows-386/minio.exe|
+|FreeBSD|64-bit|https://dl.minio.io/server/minio/release/freebsd-amd64/minio|
 
-Minio currently implements two backends
+### Install from Homebrew
+Install minio packages using [Homebrew](http://brew.sh/)
+ 
+```sh
+$ brew install minio
+$ minio --help
+```
 
-  - Filesystem (FS) - is available and ready for general purpose use.
-  - ErasureCoded (XL) - is available, but it is not ready for general purpose use.
+### Install from Source
+Source installation is only intended for developers and advanced users. If you do not have a working Golang environment, please follow [How to install Golang](https://docs.minio.io/docs/how-to-install-golang).
 
-## Minio Client
 
-[Minio Client (mc)](https://github.com/minio/mc#minio-client-mc-) provides a modern alternative to Unix commands like ``ls``, ``cat``, ``cp``, ``sync``, and ``diff``. It supports POSIX compatible filesystems and Amazon S3 compatible cloud storage systems. It is entirely written in Golang.
+```sh
+$ go get -u github.com/minio/minio
+```
 
-## Amazon S3 Compatible Client Libraries
-- [Golang Library](https://github.com/minio/minio-go)
-- [Java Library](https://github.com/minio/minio-java)
-- [Nodejs Library](https://github.com/minio/minio-js)
-- [Python Library](https://github.com/minio/minio-py)
-- [.Net Library](https://github.com/minio/minio-dotnet)
+## 2. Run Minio Server
+In the examples below, Minio serves the contents of the ``Photos`` directory as an object store.
 
-### Install [![Build Status](https://travis-ci.org/minio/minio.svg?branch=master)](https://travis-ci.org/minio/minio)[![Build status](https://ci.appveyor.com/api/projects/status/royh137dni8yevep/branch/master?svg=true)](https://ci.appveyor.com/project/harshavardhana/minio-qxbjq/branch/master)
+### Docker Container
 
-#### GNU/Linux
+```sh
+$ docker pull minio/minio
+$ docker run -p 9000:9000 minio/minio server /export
+```
 
-Download ``minio`` for:
+Please visit Minio Docker quickstart guide for more [here](https://docs.minio.io/docs/minio-docker-quickstart-guide)
 
-- ``64-bit Intel`` from https://dl.minio.io/server/minio/release/linux-amd64/minio
-- ``32-bit Intel`` from https://dl.minio.io/server/minio/release/linux-386/minio
-- ``32-bit ARM`` from https://dl.minio.io/server/minio/release/linux-arm/minio
+### GNU/Linux
 
-~~~
+```sh
 $ chmod +x minio
 $ ./minio --help
-~~~
+$ ./minio server ~/Photos
+...
+```
 
-#### OS X
+### OS X
 
-Download ``minio`` from https://dl.minio.io/server/minio/release/darwin-amd64/minio
-
-~~~
+```sh
 $ chmod 755 minio
 $ ./minio --help
-~~~
+$ ./minio server ~/Photos
+...
+```
 
-#### Microsoft Windows
+### Microsoft Windows
 
-Download ``minio`` for:
-
-- ``64-bit`` from https://dl.minio.io/server/minio/release/windows-amd64/minio.exe
-- ``32-bit`` from https://dl.minio.io/server/minio/release/windows-386/minio.exe
-
-~~~
+```sh
 C:\Users\Username\Downloads> minio.exe --help
-~~~
+C:\Users\Username\Downloads> minio.exe server D:\Photos
+...
+```
 
-#### FreeBSD
+### FreeBSD
 
-Download ``minio`` from https://dl.minio.io/server/minio/release/freebsd-amd64/minio
-
-~~~
+```sh
 $ chmod 755 minio
 $ ./minio --help
-~~~
-Read more here on [How to configure Minio on FreeBSD with ZFS backend.](./FreeBSD.md)
-
-#### Docker container
-
-Download ``minio`` for docker.
-
-~~~
-$ docker pull minio/minio
-~~~
-
-Read more here on [How to configure data volume containers for Minio?](./Docker.md)
-
-#### Source
-<blockquote>
-NOTE: Source installation is intended for only developers and advanced users.  For general use, please download official releases from https://minio.io/downloads.
-</blockquote>
-
-If you do not have a working Golang environment, please follow [Install Golang](./INSTALLGO.md).
-
-~~~
-$ go get -d github.com/minio/minio
-$ cd $GOPATH/src/github.com/minio/minio
-$ make
-~~~
-
-### How to use Minio?
-
-Start minio server.
-
-~~~
-$ minio server ~/Photos
-
-AccessKey: WLGDGYAQYIGI833EV05A  SecretKey: BYvgJM101sHngl2uzjXS/OBF/aMxAN06JrJ3qJlF  Region: us-east-1
-
-Minio Object Storage:
-    http://127.0.0.1:9000
-    http://10.1.10.177:9000
-
-Minio Browser:
-    http://127.0.0.1:9000
-    http://10.1.10.177:9000
-
-To configure Minio Client:
-    $ wget https://dl.minio.io/client/mc/release/darwin-amd64/mc
-    $ chmod 755 mc
-    $ ./mc config host add myminio http://localhost:9000 WLGDGYAQYIGI833EV05A BYvgJM101sHngl2uzjXS/OBF/aMxAN06JrJ3qJlF
-~~~
-
-#### How to use AWS CLI with Minio?
-
-<blockquote>
-This section assumes that you have already installed aws-cli, if not please visit https://aws.amazon.com/cli/
-</blockquote>
-
-To configure `aws-cli`, type `aws configure` and follow below steps.
-
+$ ./minio server ~/Photos
+...
 ```
-$ aws configure
-AWS Access Key ID [None]: YOUR_ACCESS_KEY_HERE
-AWS Secret Access Key [None]: YOUR_SECRET_KEY_HERE
-Default region name [None]: us-east-1
-Default output format [None]: ENTER
+Please visit official zfs FreeBSD guide for more details [here](https://www.freebsd.org/doc/handbook/zfs-quickstart.html)
+
+## 3. Test Minio Server using Minio Browser
+Open a web browser and navigate to http://127.0.0.1:9000 to view your buckets on minio server.
+
+![Screenshot](https://github.com/minio/minio/blob/master/docs/screenshots/minio-browser.jpg?raw=true)
+
+## 4. Test Minio Server using `mc`
+Install mc from [here](https://docs.minio.io/docs/minio-client-quickstart-guide). Use `mc ls` command to list all the buckets on your minio server.
+
+```sh
+$ mc config host add myminio http://10.0.0.10:9000 USWUXHGYZQYFYFFIT3RE MOJRH0mkL1IPauahWITSVvyDrQbEEIwljvmxdq03
+$ mc mb myminio/mybucket
+$ mc ls myminio/
+[2015-08-05 08:13:11 IST]     0B mybucket/
 ```
 
-Additionally enable `aws-cli` to use AWS Signature Version '4' for Minio server.
+For more examples please navigate to [Minio Client Complete Guide](https://docs.minio.io/docs/minio-client-complete-guide).
 
-```
-$ aws configure set default.s3.signature_version s3v4
-```
+## 5. Explore Further
+- [Minio Erasure Code QuickStart Guide](https://docs.minio.io/docs/minio-erasure-code-quickstart-guide)
+- [Minio Docker Quickstart Guide](https://docs.minio.io/docs/minio-docker-quickstart-guide)
+- [Use `mc` with Minio Server](https://docs.minio.io/docs/minio-client-quickstart-guide)
+- [Use `aws-cli` with Minio Server](https://docs.minio.io/docs/aws-cli-with-minio)
+- [Use `s3cmd` with Minio Server](https://docs.minio.io/docs/s3cmd-with-minio)
+- [Use `minio-go` SDK with Minio Server](https://docs.minio.io/docs/golang-client-quickstart-guide)
 
-To list your buckets.
-```
-$ aws --endpoint-url http://localhost:9000 s3 ls
-2016-03-27 02:06:30 deebucket
-2016-03-28 21:53:49 guestbucket
-2016-03-29 13:34:34 mbtest
-2016-03-26 22:01:36 mybucket
-2016-03-26 15:37:02 testbucket
-```
-
-To list contents inside bucket.
-```
-$ aws --endpoint-url http://localhost:9000 s3 ls s3://mybucket
-2016-03-30 00:26:53      69297 argparse-1.2.1.tar.gz
-2016-03-30 00:35:37      67250 simplejson-3.3.0.tar.gz
-```
-
-To make a bucket.
-```
-$ aws --endpoint-url http://localhost:9000 s3 mb s3://mybucket
-make_bucket: s3://mybucket/
-```
-
-To add an object to a bucket.
-```
-$ aws --endpoint-url http://localhost:9000 s3 cp simplejson-3.3.0.tar.gz s3://mybucket
-upload: ./simplejson-3.3.0.tar.gz to s3://mybucket/simplejson-3.3.0.tar.gz
-```
-
-Delete an object from a bucket.
-```
-$ aws --endpoint-url http://localhost:9000 s3 rm s3://mybucket/argparse-1.2.1.tar.gzdelete: s3://mybucket/argparse-1.2.1.tar.gz
-```
-
-Remove a bucket.
-```
-$ aws --endpoint-url http://localhost:9000 s3 rb s3://mybucket
-remove_bucket: s3://mybucket/
-```
-
-#### How to use AWS SDK with Minio?
-
-Please follow the documentation here - [Using aws-sdk-go with Minio server](./AWS-SDK-GO.md)
-
-#### How to use s3cmd with Minio?
-
-<blockquote>
-This section assumes that you have already installed s3cmd, if not please visit http://s3tools.org/s3cmd
-</blockquote>
-
-Edit the following fields in your s3cmd configuration file `~/.s3cfg` .
-
-```
-host_base = localhost:9000
-host_bucket = localhost:9000
-access_key = YOUR_ACCESS_KEY_HERE
-secret_key = YOUR_SECRET_KEY_HERE
-signature_v2 = False
-bucket_location = us-east-1
-```
-
-To make a bucket.
-```
-$ s3cmd mb s3://mybucket
-Bucket 's3://mybucket/' created
-```
-
-To copy an object to bucket.
-```
-$ s3cmd put newfile s3://testbucket
-upload: 'newfile' -> 's3://testbucket/newfile'  
-```
-
-To copy an object to local system.
-```
-$ s3cmd get s3://testbucket/newfile
-download: 's3://testbucket/newfile' -> './newfile'
-```
-
-To sync local file/directory to a bucket.
-```
-$ s3cmd sync newdemo s3://testbucket
-upload: 'newdemo/newdemofile.txt' -> 's3://testbucket/newdemo/newdemofile.txt'
-```
-
-To sync bucket or object with local filesystem.
-```
-$ s3cmd sync  s3://otherbucket otherlocalbucket
-download: 's3://otherbucket/cat.jpg' -> 'otherlocalbucket/cat.jpg'
-```
-
-To list buckets.
-```
-$ s3cmd ls s3://
-2015-12-09 16:12  s3://testbbucket
-```
-
-To list contents inside bucket.
-```
-$ s3cmd ls s3://testbucket/
-                       DIR   s3://testbucket/test/
-2015-12-09 16:05    138504   s3://testbucket/newfile
-```
-
-Delete an object from bucket.
-```
-$ s3cmd del s3://testbucket/newfile
-delete: 's3://testbucket/newfile'
-```
-
-Delete a bucket.
-```
-$ s3cmd rb s3://testbucket
-Bucket 's3://testbucket/' removed
-```
-
-## Contribute to Minio Project
-Please follow Minio [Contributor's Guide](./CONTRIBUTING.md)
-
-### Jobs
-If you think in Lisp or Haskell and hack in go, you would blend right in. Send your github link to callhome@minio.io.
+## 6. Contribute to Minio Project
+Please follow Minio [Contributor's Guide](https://github.com/minio/minio/blob/master/CONTRIBUTING.md)

accesslog-handler.go

@@ -1,118 +0,0 @@
-/*
- * Minimalist Object Storage, (C) 2015 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 main
-
-import (
-	"encoding/json"
-	"net/http"
-	"net/url"
-	"os"
-	"time"
-)
-
-type accessLogHandler struct {
-	http.Handler
-	accessLogFile *os.File
-}
-
-// LogMessage is a serializable json log message
-type LogMessage struct {
-	StartTime     time.Time
-	Duration      time.Duration
-	StatusMessage string // human readable http status message
-	ContentLength string // human readable content length
-
-	// HTTP detailed message
-	HTTP struct {
-		ResponseHeaders http.Header
-		Request         struct {
-			Method     string
-			URL        *url.URL
-			Proto      string // "HTTP/1.0"
-			ProtoMajor int    // 1
-			ProtoMinor int    // 0
-			Header     http.Header
-			Host       string
-			Form       url.Values
-			PostForm   url.Values
-			Trailer    http.Header
-			RemoteAddr string
-			RequestURI string
-		}
-	}
-}
-
-func (h *accessLogHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	message, err := getLogMessage(w, req)
-	fatalIf(err, "Unable to parse HTTP request and response fields.")
-	_, err = h.accessLogFile.Write(message)
-	fatalIf(err, "Unable to log HTTP access.")
-
-	h.Handler.ServeHTTP(w, req)
-}
-
-func getLogMessage(w http.ResponseWriter, req *http.Request) ([]byte, error) {
-	logMessage := &LogMessage{
-		StartTime: time.Now().UTC(),
-	}
-	// store lower level details
-	logMessage.HTTP.ResponseHeaders = w.Header()
-	logMessage.HTTP.Request = struct {
-		Method     string
-		URL        *url.URL
-		Proto      string // "HTTP/1.0"
-		ProtoMajor int    // 1
-		ProtoMinor int    // 0
-		Header     http.Header
-		Host       string
-		Form       url.Values
-		PostForm   url.Values
-		Trailer    http.Header
-		RemoteAddr string
-		RequestURI string
-	}{
-		Method:     req.Method,
-		URL:        req.URL,
-		Proto:      req.Proto,
-		ProtoMajor: req.ProtoMajor,
-		ProtoMinor: req.ProtoMinor,
-		Header:     req.Header,
-		Host:       req.Host,
-		Form:       req.Form,
-		PostForm:   req.PostForm,
-		Trailer:    req.Header,
-		RemoteAddr: req.RemoteAddr,
-		RequestURI: req.RequestURI,
-	}
-
-	// logMessage.HTTP.Request = req
-	logMessage.Duration = time.Now().UTC().Sub(logMessage.StartTime)
-	js, err := json.Marshal(logMessage)
-	if err != nil {
-		return nil, err
-	}
-	js = append(js, byte('\n')) // append a new line
-	return js, nil
-}
-
-// setAccessLogHandler logs requests
-func setAccessLogHandler(h http.Handler) http.Handler {
-	file, err := os.OpenFile("access.log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
-	fatalIf(err, "Failed top open access log.")
-
-	return &accessLogHandler{Handler: h, accessLogFile: file}
-}

appveyor.yml

@@ -1,39 +1,54 @@
-# Operating system (build VM template)
-os: Visual Studio 2015
+# version format
+version: "{build}"
 
+# Operating system (build VM template)
+os: Windows Server 2012 R2
+
+# Platform.
 platform: x64
 
 clone_folder: c:\gopath\src\github.com\minio\minio
 
-# environment variables
+# Environment variables
 environment:
   GOPATH: c:\gopath
-  GO_EXTLINK_ENABLED: 0
   GO15VENDOREXPERIMENT: 1
 
 # scripts that run after cloning repository
 install:
-  - '"C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64'
   - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
-  - rd C:\Go /s /q
-  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.6.windows-amd64.zip
-  - 7z x go1.6.windows-amd64.zip -oC:\ >nul
   - go version
   - go env
-  - cd %GOPATH%\src\github.com\minio\minio
+  - python --version
 
-# to run your custom scripts instead of automatic MSBuild
+# To run your custom scripts instead of automatic MSBuild
 build_script:
-  - go test .
-  - go test -race .
-  - go test github.com/minio/minio/pkg...
-  - go test -race github.com/minio/minio/pkg...
+  # Compile
+  - appveyor AddCompilationMessage "Starting Compile"
+  - cd c:\gopath\src\github.com\minio\minio
   - go run buildscripts/gen-ldflags.go > temp.txt
   - set /p BUILD_LDFLAGS=<temp.txt
   - go build -ldflags="%BUILD_LDFLAGS%" -o %GOPATH%\bin\minio.exe
+  - appveyor AddCompilationMessage "Compile Success"
 
-# to disable automatic tests
-test: off
+# To run your custom scripts instead of automatic tests
+test_script:
+  # Unit tests
+  - ps: Add-AppveyorTest "Unit Tests" -Outcome Running
+  - mkdir build\coverage
+  - go test -race github.com/minio/minio/cmd...
+  - go test -race github.com/minio/minio/pkg...
+  - go test -coverprofile=build\coverage\coverage.txt -covermode=atomic github.com/minio/minio/cmd
+  - ps: Update-AppveyorTest "Unit Tests" -Outcome Passed
+
+after_test:
+  - go tool cover -html=build\coverage\coverage.txt -o build\coverage\coverage.html
+  - ps: Push-AppveyorArtifact build\coverage\coverage.txt
+  - ps: Push-AppveyorArtifact build\coverage\coverage.html
+  # Upload coverage report.
+  - "SET PATH=C:\\Python34;C:\\Python34\\Scripts;%PATH%"
+  - pip install codecov
+  - codecov -X gcov -f "build\coverage\coverage.txt"
 
 # to disable deployment
 deploy: off

auth-handler.go

@@ -1,167 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2015 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 main
-
-import (
-	"bytes"
-	"crypto/md5"
-	"crypto/sha256"
-	"encoding/base64"
-	"encoding/hex"
-	"io/ioutil"
-	"net/http"
-	"strings"
-)
-
-// Verify if request has JWT.
-func isRequestJWT(r *http.Request) bool {
-	if _, ok := r.Header["Authorization"]; ok {
-		if strings.HasPrefix(r.Header.Get("Authorization"), jwtAlgorithm) {
-			return true
-		}
-	}
-	return false
-}
-
-// Verify if request has AWS Signature Version '4'.
-func isRequestSignatureV4(r *http.Request) bool {
-	if _, ok := r.Header["Authorization"]; ok {
-		if strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm) {
-			return true
-		}
-	}
-	return false
-}
-
-// Verify if request has AWS Presignature Version '4'.
-func isRequestPresignedSignatureV4(r *http.Request) bool {
-	if _, ok := r.URL.Query()["X-Amz-Credential"]; ok {
-		return true
-	}
-	return false
-}
-
-// Verify if request has AWS Post policy Signature Version '4'.
-func isRequestPostPolicySignatureV4(r *http.Request) bool {
-	if _, ok := r.Header["Content-Type"]; ok {
-		if strings.Contains(r.Header.Get("Content-Type"), "multipart/form-data") && r.Method == "POST" {
-			return true
-		}
-	}
-	return false
-}
-
-// Authorization type.
-type authType int
-
-// List of all supported auth types.
-const (
-	authTypeUnknown authType = iota
-	authTypeAnonymous
-	authTypePresigned
-	authTypePostPolicy
-	authTypeSigned
-	authTypeJWT
-)
-
-// Get request authentication type.
-func getRequestAuthType(r *http.Request) authType {
-	if isRequestSignatureV4(r) {
-		return authTypeSigned
-	} else if isRequestPresignedSignatureV4(r) {
-		return authTypePresigned
-	} else if isRequestJWT(r) {
-		return authTypeJWT
-	} else if isRequestPostPolicySignatureV4(r) {
-		return authTypePostPolicy
-	} else if _, ok := r.Header["Authorization"]; !ok {
-		return authTypeAnonymous
-	}
-	return authTypeUnknown
-}
-
-// sum256 calculate sha256 sum for an input byte array
-func sum256(data []byte) []byte {
-	hash := sha256.New()
-	hash.Write(data)
-	return hash.Sum(nil)
-}
-
-// sumMD5 calculate md5 sum for an input byte array
-func sumMD5(data []byte) []byte {
-	hash := md5.New()
-	hash.Write(data)
-	return hash.Sum(nil)
-}
-
-// Verify if request has valid AWS Signature Version '4'.
-func isReqAuthenticated(r *http.Request) (s3Error APIErrorCode) {
-	if r == nil {
-		return ErrInternalError
-	}
-	payload, err := ioutil.ReadAll(r.Body)
-	if err != nil {
-		return ErrInternalError
-	}
-	// Verify Content-Md5, if payload is set.
-	if r.Header.Get("Content-Md5") != "" {
-		if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(sumMD5(payload)) {
-			return ErrBadDigest
-		}
-	}
-	// Populate back the payload.
-	r.Body = ioutil.NopCloser(bytes.NewReader(payload))
-	validateRegion := true // Validate region.
-	if isRequestSignatureV4(r) {
-		return doesSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
-	} else if isRequestPresignedSignatureV4(r) {
-		return doesPresignedSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
-	}
-	return ErrAccessDenied
-}
-
-// authHandler - handles all the incoming authorization headers and
-// validates them if possible.
-type authHandler struct {
-	handler http.Handler
-}
-
-// setAuthHandler to validate authorization header for the incoming request.
-func setAuthHandler(h http.Handler) http.Handler {
-	return authHandler{h}
-}
-
-// handler for validating incoming authorization headers.
-func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	switch getRequestAuthType(r) {
-	case authTypeAnonymous, authTypePresigned, authTypeSigned, authTypePostPolicy:
-		// Let top level caller validate for anonymous and known
-		// signed requests.
-		a.handler.ServeHTTP(w, r)
-		return
-	case authTypeJWT:
-		// Validate Authorization header if its valid for JWT request.
-		if !isJWTReqAuthenticated(r) {
-			w.WriteHeader(http.StatusUnauthorized)
-			return
-		}
-		a.handler.ServeHTTP(w, r)
-	default:
-		writeErrorResponse(w, r, ErrSignatureVersionNotSupported, r.URL.Path)
-		return
-	}
-}

bucket-policy-handlers_test.go

@@ -1,78 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2015, 2016 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 main
-
-import (
-	"fmt"
-	"testing"
-)
-
-// Tests validate Bucket policy resource matcher.
-func TestBucketPolicyResourceMatch(t *testing.T) {
-
-	// generates\ statement with given resource..
-	generateStatement := func(resource string) policyStatement {
-		statement := policyStatement{}
-		statement.Resources = []string{resource}
-		return statement
-	}
-
-	// generates resource prefix.
-	generateResource := func(bucketName, objectName string) string {
-		return AWSResourcePrefix + bucketName + "/" + objectName
-	}
-
-	testCases := []struct {
-		resourceToMatch       string
-		statement             policyStatement
-		expectedResourceMatch bool
-	}{
-		// Test case 1-4.
-		// Policy with resource ending with bucket/* allows access to all objects inside the given bucket.
-		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
-		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
-		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
-		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
-		// Test case - 5.
-		// Policy with resource ending with bucket/oo* should not allow access to bucket/output.txt.
-		{generateResource("minio-bucket", "output.txt"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/oo*")), false},
-		// Test case - 6.
-		// Policy with resource ending with bucket/oo* should allow access to bucket/ootput.txt.
-		{generateResource("minio-bucket", "ootput.txt"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/oo*")), true},
-		// Test case - 7.
-		// Policy with resource ending with bucket/oo* allows access to all subfolders starting with "oo" inside given bucket.
-		{generateResource("minio-bucket", "oop-bucket/my-file"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/oo*")), true},
-		// Test case - 8.
-		{generateResource("minio-bucket", "Asia/India/1.pjg"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/Asia/Japan/*")), false},
-		// Test case - 9.
-		{generateResource("minio-bucket", "Asia/India/1.pjg"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/Asia/Japan/*")), false},
-		// Test case - 10.
-		// Proves that the name space is flat.
-		{generateResource("minio-bucket", "Africa/Bihar/India/design_info.doc/Bihar"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix,
-			"minio-bucket"+"/*/India/*/Bihar")), true},
-		// Test case - 11.
-		// Proves that the name space is flat.
-		{generateResource("minio-bucket", "Asia/China/India/States/Bihar/output.txt"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix,
-			"minio-bucket"+"/*/India/*/Bihar/*")), true},
-	}
-	for i, testCase := range testCases {
-		actualResourceMatch := bucketPolicyResourceMatch(testCase.resourceToMatch, testCase.statement)
-		if testCase.expectedResourceMatch != actualResourceMatch {
-			t.Errorf("Test %d: Expected Resource match to be `%v`, but instead found it to be `%v`", i+1, testCase.expectedResourceMatch, actualResourceMatch)
-		}
-	}
-}

bucket-policy.go

@@ -1,128 +0,0 @@
-/*
- * Minio Cloud Storage, (C) 2015, 2016 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 main
-
-import (
-	"io/ioutil"
-	"os"
-	"path/filepath"
-)
-
-// getBucketsConfigPath - get buckets path.
-func getBucketsConfigPath() (string, error) {
-	configPath, err := getConfigPath()
-	if err != nil {
-		return "", err
-	}
-	return filepath.Join(configPath, "buckets"), nil
-}
-
-// getBucketConfigPath - get bucket config path.
-func getBucketConfigPath(bucket string) (string, error) {
-	bucketsConfigPath, err := getBucketsConfigPath()
-	if err != nil {
-		return "", err
-	}
-	return filepath.Join(bucketsConfigPath, bucket), nil
-}
-
-// createBucketConfigPath - create bucket config directory.
-func createBucketConfigPath(bucket string) error {
-	bucketConfigPath, err := getBucketConfigPath(bucket)
-	if err != nil {
-		return err
-	}
-	return os.MkdirAll(bucketConfigPath, 0700)
-}
-
-// readBucketPolicy - read bucket policy.
-func readBucketPolicy(bucket string) ([]byte, error) {
-	// Verify bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return nil, BucketNameInvalid{Bucket: bucket}
-	}
-
-	bucketConfigPath, err := getBucketConfigPath(bucket)
-	if err != nil {
-		return nil, err
-	}
-
-	// Get policy file.
-	bucketPolicyFile := filepath.Join(bucketConfigPath, "access-policy.json")
-	if _, err = os.Stat(bucketPolicyFile); err != nil {
-		if os.IsNotExist(err) {
-			return nil, BucketPolicyNotFound{Bucket: bucket}
-		}
-		return nil, err
-	}
-	return ioutil.ReadFile(bucketPolicyFile)
-}
-
-// removeBucketPolicy - remove bucket policy.
-func removeBucketPolicy(bucket string) error {
-	// Verify bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return BucketNameInvalid{Bucket: bucket}
-	}
-
-	bucketConfigPath, err := getBucketConfigPath(bucket)
-	if err != nil {
-		return err
-	}
-
-	// Get policy file.
-	bucketPolicyFile := filepath.Join(bucketConfigPath, "access-policy.json")
-	if _, err = os.Stat(bucketPolicyFile); err != nil {
-		if os.IsNotExist(err) {
-			return BucketPolicyNotFound{Bucket: bucket}
-		}
-		return err
-	}
-	if err := os.Remove(bucketPolicyFile); err != nil {
-		return err
-	}
-	return nil
-}
-
-// writeBucketPolicy - save bucket policy.
-func writeBucketPolicy(bucket string, accessPolicyBytes []byte) error {
-	// Verify if bucket path legal
-	if !IsValidBucketName(bucket) {
-		return BucketNameInvalid{Bucket: bucket}
-	}
-
-	// Create bucket config path.
-	if err := createBucketConfigPath(bucket); err != nil {
-		return err
-	}
-
-	bucketConfigPath, err := getBucketConfigPath(bucket)
-	if err != nil {
-		return err
-	}
-
-	// Get policy file.
-	bucketPolicyFile := filepath.Join(bucketConfigPath, "access-policy.json")
-	if _, err := os.Stat(bucketPolicyFile); err != nil {
-		if !os.IsNotExist(err) {
-			return err
-		}
-	}
-
-	// Write bucket policy.
-	return ioutil.WriteFile(bucketPolicyFile, accessPolicyBytes, 0600)
-}

buildscripts/checkdeps.sh

@@ -212,7 +212,7 @@ main() {
         echo "Please install them "
         echo "${MISSING}"
         echo
-        echo "Follow https://github.com/minio/minio/blob/master/INSTALLGO.md for further instructions"
+        echo "Follow https://docs.minio.io/docs/how-to-install-golang for further instructions"
         exit 1
     fi
     echo "Done"

buildscripts/gen-ldflags.go

@@ -28,11 +28,11 @@ import (
 
 func genLDFlags(version string) string {
 	var ldflagsStr string
-	ldflagsStr = "-X main.minioVersion=" + version
-	ldflagsStr += " -X main.minioReleaseTag=" + releaseTag(version)
-	ldflagsStr += " -X main.minioCommitID=" + commitID()
-	ldflagsStr += " -X main.minioShortCommitID=" + commitID()[:12]
-	ldflagsStr += " -X main.minioGOPATH=" + os.Getenv("GOPATH")
+	ldflagsStr = "-X github.com/minio/minio/cmd.Version=" + version
+	ldflagsStr += " -X github.com/minio/minio/cmd.ReleaseTag=" + releaseTag(version)
+	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")
 	return ldflagsStr
 }
 

buildscripts/go-coverage.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -e
+echo "" > coverage.txt
+
+for d in $(go list ./... | grep -v vendor); do
+    go test -coverprofile=profile.out -covermode=atomic $d
+    if [ -f profile.out ]; then
+        cat profile.out >> coverage.txt
+        rm profile.out
+    fi
+done

cmd/access-key.go

@@ -14,12 +14,11 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"crypto/rand"
 	"encoding/base64"
-	"fmt"
 	"regexp"
 )
 
@@ -29,13 +28,6 @@ type credential struct {
 	SecretAccessKey string `json:"secretKey"`
 }
 
-// stringer colorized access keys.
-func (a credential) String() string {
-	accessStr := colorMagenta("AccessKey: ") + colorWhite(a.AccessKeyID)
-	secretStr := colorMagenta("SecretKey: ") + colorWhite(a.SecretAccessKey)
-	return fmt.Sprint(accessStr + "  " + secretStr)
-}
-
 const (
 	minioAccessID = 20
 	minioSecretID = 40

cmd/api-datatypes.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"encoding/xml"

cmd/api-errors.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"encoding/xml"
@@ -74,6 +74,7 @@ const (
 	ErrNoSuchKey
 	ErrNoSuchUpload
 	ErrNotImplemented
+	ErrPreconditionFailed
 	ErrRequestTimeTooSkewed
 	ErrSignatureDoesNotMatch
 	ErrMethodNotAllowed
@@ -95,20 +96,47 @@ const (
 	ErrMissingSignHeadersTag
 	ErrPolicyAlreadyExpired
 	ErrMalformedDate
+	ErrMalformedPresignedDate
+	ErrMalformedCredentialDate
+	ErrMalformedCredentialRegion
 	ErrMalformedExpires
+	ErrNegativeExpires
 	ErrAuthHeaderEmpty
 	ErrExpiredPresignRequest
+	ErrRequestNotReadyYet
+	ErrUnsignedHeaders
 	ErrMissingDateHeader
 	ErrInvalidQuerySignatureAlgo
 	ErrInvalidQueryParams
 	ErrBucketAlreadyOwnedByYou
 	// Add new error codes here.
 
+	// Bucket notification related errors.
+	ErrEventNotification
+	ErrARNNotification
+	ErrRegionNotification
+	ErrOverlappingFilterNotification
+	ErrFilterNameInvalid
+	ErrFilterNamePrefix
+	ErrFilterNameSuffix
+	ErrFilterValueInvalid
+	ErrOverlappingConfigs
+
+	// S3 extended errors.
+	ErrContentSHA256Mismatch
+
+	// Add new extended error codes here.
+
 	// Minio extended errors.
 	ErrReadQuorum
 	ErrWriteQuorum
 	ErrStorageFull
 	ErrObjectExistsAsDirectory
+	ErrPolicyNesting
+	ErrInvalidObjectName
+	// Add new extended error codes here.
+	// Please open a https://github.com/minio/minio/issues before adding
+	// new error codes here.
 )
 
 // error code to APIError structure, these fields carry respective
@@ -131,17 +159,17 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	},
 	ErrInvalidMaxUploads: {
 		Code:           "InvalidArgument",
-		Description:    "Argument maxUploads must be an integer between 0 and 2147483647.",
+		Description:    "Argument max-uploads must be an integer between 0 and 2147483647",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrInvalidMaxKeys: {
 		Code:           "InvalidArgument",
-		Description:    "Argument maxKeys must be an integer between 0 and 2147483647.",
+		Description:    "Argument maxKeys must be an integer between 0 and 2147483647",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrInvalidMaxParts: {
 		Code:           "InvalidArgument",
-		Description:    "Argument maxParts must be an integer between 1 and 10000.",
+		Description:    "Argument max-parts must be an integer between 0 and 2147483647",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrInvalidPartNumberMarker: {
@@ -206,7 +234,7 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	},
 	ErrInvalidRange: {
 		Code:           "InvalidRange",
-		Description:    "The requested range cannot be satisfied.",
+		Description:    "The requested range is not satisfiable",
 		HTTPStatusCode: http.StatusRequestedRangeNotSatisfiable,
 	},
 	ErrMalformedXML: {
@@ -231,12 +259,12 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	},
 	ErrNoSuchBucket: {
 		Code:           "NoSuchBucket",
-		Description:    "The specified bucket does not exist.",
+		Description:    "The specified bucket does not exist",
 		HTTPStatusCode: http.StatusNotFound,
 	},
 	ErrNoSuchBucketPolicy: {
 		Code:           "NoSuchBucketPolicy",
-		Description:    "The specified bucket does not have a bucket policy.",
+		Description:    "The bucket policy does not exist",
 		HTTPStatusCode: http.StatusNotFound,
 	},
 	ErrNoSuchKey: {
@@ -246,14 +274,19 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	},
 	ErrNoSuchUpload: {
 		Code:           "NoSuchUpload",
-		Description:    "The specified multipart upload does not exist.",
+		Description:    "The specified multipart upload does not exist. The upload ID may be invalid, or the upload may have been aborted or completed.",
 		HTTPStatusCode: http.StatusNotFound,
 	},
 	ErrNotImplemented: {
 		Code:           "NotImplemented",
-		Description:    "A header you provided implies functionality that is not implemented.",
+		Description:    "A header you provided implies functionality that is not implemented",
 		HTTPStatusCode: http.StatusNotImplemented,
 	},
+	ErrPreconditionFailed: {
+		Code:           "PreconditionFailed",
+		Description:    "At least one of the pre-conditions you specified did not hold",
+		HTTPStatusCode: http.StatusPreconditionFailed,
+	},
 	ErrRequestTimeTooSkewed: {
 		Code:           "RequestTimeTooSkewed",
 		Description:    "The difference between the request time and the server's time is too large.",
@@ -261,7 +294,7 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	},
 	ErrSignatureDoesNotMatch: {
 		Code:           "SignatureDoesNotMatch",
-		Description:    "The request signature we calculated does not match the signature you provided.",
+		Description:    "The request signature we calculated does not match the signature you provided. Check your key and signing method.",
 		HTTPStatusCode: http.StatusForbidden,
 	},
 	ErrMethodNotAllowed: {
@@ -296,7 +329,7 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	},
 	ErrBucketNotEmpty: {
 		Code:           "BucketNotEmpty",
-		Description:    "The bucket you tried to delete is not empty.",
+		Description:    "The bucket you tried to delete is not empty",
 		HTTPStatusCode: http.StatusConflict,
 	},
 	ErrAllAccessDisabled: {
@@ -320,8 +353,8 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrCredMalformed: {
-		Code:           "CredentialMalformed",
-		Description:    "Credential field malformed does not follow accessKeyID/credScope.",
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "Error parsing the X-Amz-Credential parameter; the Credential is mal-formed; expecting \"<YOUR-AKID>/YYYYMMDD/REGION/SERVICE/aws4_request\".",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrMalformedDate: {
@@ -329,19 +362,46 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "Invalid date format header, expected to be in ISO8601, RFC1123 or RFC1123Z time format.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	ErrMalformedPresignedDate: {
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "X-Amz-Date must be in the ISO8601 Long Format \"yyyyMMdd'T'HHmmss'Z'\"",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	// FIXME: Should contain the invalid param set as seen in https://github.com/minio/minio/issues/2385.
+	// right Description:    "Error parsing the X-Amz-Credential parameter; incorrect date format \"%s\". This date in the credential must be in the format \"yyyyMMdd\".",
+	// Need changes to make sure variable messages can be constructed.
+	ErrMalformedCredentialDate: {
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "Error parsing the X-Amz-Credential parameter; incorrect date format \"%s\". This date in the credential must be in the format \"yyyyMMdd\".",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	// FIXME: Should contain the invalid param set as seen in https://github.com/minio/minio/issues/2385.
+	// right Description:    "Error parsing the X-Amz-Credential parameter; the region 'us-east-' is wrong; expecting 'us-east-1'".
+	// Need changes to make sure variable messages can be constructed.
+	ErrMalformedCredentialRegion: {
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "Error parsing the X-Amz-Credential parameter; the region is wrong;",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrInvalidRegion: {
 		Code:           "InvalidRegion",
 		Description:    "Region does not match.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	// FIXME: Should contain the invalid param set as seen in https://github.com/minio/minio/issues/2385.
+	// right Description:   "Error parsing the X-Amz-Credential parameter; incorrect service \"s4\". This endpoint belongs to \"s3\".".
+	// Need changes to make sure variable messages can be constructed.
 	ErrInvalidService: {
-		Code:           "AccessDenied",
-		Description:    "Service scope should be of value 's3'.",
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "Error parsing the X-Amz-Credential parameter; incorrect service. This endpoint belongs to \"s3\".",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	// FIXME: Should contain the invalid param set as seen in https://github.com/minio/minio/issues/2385.
+	// Description:   "Error parsing the X-Amz-Credential parameter; incorrect terminal "aws4_reque". This endpoint uses "aws4_request".
+	// Need changes to make sure variable messages can be constructed.
 	ErrInvalidRequestVersion: {
-		Code:           "AccessDenied",
-		Description:    "Request scope should be of value 'aws4_request'.",
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "Error parsing the X-Amz-Credential parameter; incorrect terminal. This endpoint uses \"aws4_request\".",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrMissingSignTag: {
@@ -360,8 +420,13 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrMalformedExpires: {
-		Code:           "MalformedExpires",
-		Description:    "Malformed expires header, expected non-zero number.",
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "X-Amz-Expires should be a number",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrNegativeExpires: {
+		Code:           "AuthorizationQueryParametersError",
+		Description:    "X-Amz-Expires must be non-negative",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrAuthHeaderEmpty: {
@@ -381,7 +446,18 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 	},
 	ErrExpiredPresignRequest: {
 		Code:           "AccessDenied",
-		Description:    "Request has expired.",
+		Description:    "Request has expired",
+		HTTPStatusCode: http.StatusForbidden,
+	},
+	ErrRequestNotReadyYet: {
+		Code:           "AccessDenied",
+		Description:    "Request is not valid yet",
+		HTTPStatusCode: http.StatusForbidden,
+	},
+	// FIXME: Actual XML error response also contains the header which missed in lsit of signed header parameters.
+	ErrUnsignedHeaders: {
+		Code:           "AccessDenied",
+		Description:    "There were headers present in the request which were not signed",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
 	ErrInvalidQueryParams: {
@@ -394,6 +470,61 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "Your previous request to create the named bucket succeeded and you already own it.",
 		HTTPStatusCode: http.StatusConflict,
 	},
+
+	/// Bucket notification related errors.
+	ErrEventNotification: {
+		Code:           "InvalidArgument",
+		Description:    "A specified event is not supported for notifications.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrARNNotification: {
+		Code:           "InvalidArgument",
+		Description:    "A specified destination ARN does not exist or is not well-formed. Verify the destination ARN.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrRegionNotification: {
+		Code:           "InvalidArgument",
+		Description:    "A specified destination is in a different region than the bucket. You must use a destination that resides in the same region as the bucket.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrOverlappingFilterNotification: {
+		Code:           "InvalidArgument",
+		Description:    "An object key name filtering rule defined with overlapping prefixes, overlapping suffixes, or overlapping combinations of prefixes and suffixes for the same event types.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrFilterNameInvalid: {
+		Code:           "InvalidArgument",
+		Description:    "filter rule name must be either prefix or suffix",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrFilterNamePrefix: {
+		Code:           "InvalidArgument",
+		Description:    "Cannot specify more than one prefix rule in a filter.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrFilterNameSuffix: {
+		Code:           "InvalidArgument",
+		Description:    "Cannot specify more than one suffix rule in a filter.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrFilterValueInvalid: {
+		Code:           "InvalidArgument",
+		Description:    "Size of filter rule value cannot exceed 1024 bytes in UTF-8 representation",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+	ErrOverlappingConfigs: {
+		Code:           "InvalidArgument",
+		Description:    "Configurations overlap. Configurations on the same bucket cannot share a common event type.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+
+	/// S3 extensions.
+	ErrContentSHA256Mismatch: {
+		Code:           "XAmzContentSHA256Mismatch",
+		Description:    "The provided 'x-amz-content-sha256' header does not match what was computed.",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
+
 	/// Minio extensions.
 	ErrStorageFull: {
 		Code:           "XMinioStorageFull",
@@ -415,6 +546,16 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "Multiple disks failures, unable to write data.",
 		HTTPStatusCode: http.StatusServiceUnavailable,
 	},
+	ErrPolicyNesting: {
+		Code:           "XMinioPolicyNesting",
+		Description:    "Policy nesting conflict has occurred.",
+		HTTPStatusCode: http.StatusConflict,
+	},
+	ErrInvalidObjectName: {
+		Code:           "XMinioInvalidObjectName",
+		Description:    "Object name contains unsupported characters. Unsupported characters are `^*|\\\"",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	// Add your error structure here.
 }
 
@@ -426,8 +567,15 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		return ErrNone
 	}
 	// Verify if the underlying error is signature mismatch.
-	if err == errSignatureMismatch {
-		return ErrSignatureDoesNotMatch
+	switch err {
+	case errSignatureMismatch:
+		apiErr = ErrSignatureDoesNotMatch
+	case errContentSHA256Mismatch:
+		apiErr = ErrContentSHA256Mismatch
+	}
+	if apiErr != ErrNone {
+		// If there was a match in the above switch case.
+		return apiErr
 	}
 	switch err.(type) {
 	case StorageFull:
@@ -449,7 +597,7 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 	case ObjectNotFound:
 		apiErr = ErrNoSuchKey
 	case ObjectNameInvalid:
-		apiErr = ErrNoSuchKey
+		apiErr = ErrInvalidObjectName
 	case InvalidUploadID:
 		apiErr = ErrNoSuchUpload
 	case InvalidPart:
@@ -486,3 +634,7 @@ func getAPIErrorResponse(err APIError, resource string) APIErrorResponse {
 
 	return data
 }
+
+func getErrMalformedCredentialDate(malformedDateStr string) {
+
+}

cmd/api-headers.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"bytes"
@@ -44,7 +44,7 @@ func generateRequestID() []byte {
 func setCommonHeaders(w http.ResponseWriter) {
 	// Set unique request ID for each reply.
 	w.Header().Set("X-Amz-Request-Id", string(generateRequestID()))
-	w.Header().Set("Server", ("Minio/" + minioReleaseTag + " (" + runtime.GOOS + "; " + runtime.GOARCH + ")"))
+	w.Header().Set("Server", ("Minio/" + ReleaseTag + " (" + runtime.GOOS + "; " + runtime.GOARCH + ")"))
 	w.Header().Set("Accept-Ranges", "bytes")
 }
 
@@ -62,24 +62,28 @@ func setObjectHeaders(w http.ResponseWriter, objInfo ObjectInfo, contentRange *h
 	// set common headers
 	setCommonHeaders(w)
 
-	// set object-related metadata headers
+	// Set content length.
+	w.Header().Set("Content-Length", strconv.FormatInt(objInfo.Size, 10))
+
+	// Set last modified time.
 	lastModified := objInfo.ModTime.UTC().Format(http.TimeFormat)
 	w.Header().Set("Last-Modified", lastModified)
 
-	w.Header().Set("Content-Type", objInfo.ContentType)
+	// Set Etag if available.
 	if objInfo.MD5Sum != "" {
 		w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
 	}
 
-	w.Header().Set("Content-Length", strconv.FormatInt(objInfo.Size, 10))
+	// Set all other user defined metadata.
+	for k, v := range objInfo.UserDefined {
+		w.Header().Set(k, v)
+	}
 
 	// for providing ranged content
-	if contentRange != nil {
-		if contentRange.start > 0 || contentRange.length > 0 {
-			// override content-length
-			w.Header().Set("Content-Length", strconv.FormatInt(contentRange.length, 10))
-			w.Header().Set("Content-Range", contentRange.String())
-			w.WriteHeader(http.StatusPartialContent)
-		}
+	if contentRange != nil && contentRange.offsetBegin > -1 {
+		// 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-headers_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"testing"

cmd/api-resources.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"net/url"
@@ -36,7 +36,7 @@ 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, maxkeys int, encodingType string) {
+func getListObjectsV2Args(values url.Values) (prefix, token, startAfter, delimiter string, fetchOwner bool, maxkeys int, encodingType string) {
 	prefix = values.Get("prefix")
 	startAfter = values.Get("start-after")
 	delimiter = values.Get("delimiter")
@@ -47,23 +47,9 @@ func getListObjectsV2Args(values url.Values) (prefix, token, startAfter, delimit
 	}
 	encodingType = values.Get("encoding-type")
 	token = values.Get("continuation-token")
-	return
-}
-
-// Parse bucket url queries
-func getBucketResources(values url.Values) (listType int, prefix, marker, delimiter string, maxkeys int, encodingType string) {
-	if values.Get("list-type") != "" {
-		listType, _ = strconv.Atoi(values.Get("list-type"))
+	if values.Get("fetch-owner") == "true" {
+		fetchOwner = true
 	}
-	prefix = values.Get("prefix")
-	marker = values.Get("marker")
-	delimiter = values.Get("delimiter")
-	if values.Get("max-keys") != "" {
-		maxkeys, _ = strconv.Atoi(values.Get("max-keys"))
-	} else {
-		maxkeys = maxObjectList
-	}
-	encodingType = values.Get("encoding-type")
 	return
 }
 

cmd/api-response-multipart.go

@@ -0,0 +1,54 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 file carries any specific responses constructed/necessary in
+// multipart operations.
+package cmd
+
+import "net/http"
+
+// writeErrorResponsePartTooSmall - function is used specifically to
+// construct a proper error response during CompleteMultipartUpload
+// when one of the parts is < 5MB.
+// The requirement comes due to the fact that generic ErrorResponse
+// XML doesn't carry the additional fields required to send this
+// error. So we construct a new type which lies well within the scope
+// of this function.
+func writePartSmallErrorResponse(w http.ResponseWriter, r *http.Request, err PartTooSmall) {
+	// Represents additional fields necessary for ErrPartTooSmall S3 error.
+	type completeMultipartAPIError struct {
+		// Proposed size represents uploaded size of the part.
+		ProposedSize int64
+		// Minimum size allowed epresents the minimum size allowed per
+		// part. Defaults to 5MB.
+		MinSizeAllowed int64
+		// Part number of the part which is incorrect.
+		PartNumber int
+		// ETag of the part which is incorrect.
+		PartETag string
+		// Other default XML error responses.
+		APIErrorResponse
+	}
+	// Generate complete multipart error response.
+	errorResponse := getAPIErrorResponse(getAPIError(toAPIErrorCode(err)), r.URL.Path)
+	cmpErrResp := completeMultipartAPIError{err.PartSize, int64(5242880), err.PartNumber, err.PartETag, errorResponse}
+	encodedErrorResponse := encodeResponse(cmpErrResp)
+	// Write error body
+	w.Write(encodedErrorResponse)
+	w.(http.Flusher).Flush()
+}
+
+// Add any other multipart specific responses here.

cmd/api-response.go

@@ -14,11 +14,12 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"encoding/xml"
 	"net/http"
+	"path"
 	"time"
 )
 
@@ -225,16 +226,6 @@ type CompleteMultipartUploadResponse struct {
 	ETag     string
 }
 
-// PostResponse container for completed post upload response
-type PostResponse struct {
-	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ PostResponse" json:"-"`
-
-	Location string
-	Bucket   string
-	Key      string
-	ETag     string
-}
-
 // DeleteError structure.
 type DeleteError struct {
 	Code    string
@@ -255,7 +246,7 @@ type DeleteObjectsResponse struct {
 
 // getLocation get URL location.
 func getLocation(r *http.Request) string {
-	return r.URL.Path
+	return path.Clean(r.URL.Path) // Clean any trailing slashes.
 }
 
 // getObjectLocation gets the relative URL for an object
@@ -290,8 +281,8 @@ func generateListBucketsResponse(buckets []BucketInfo) ListBucketsResponse {
 	return data
 }
 
-// generates an ListObjects response for the said bucket with other enumerated options.
-func generateListObjectsResponse(bucket, prefix, marker, delimiter string, maxKeys int, resp ListObjectsInfo) ListObjectsResponse {
+// generates an ListObjectsV1 response for the said bucket with other enumerated options.
+func generateListObjectsV1Response(bucket, prefix, marker, delimiter string, maxKeys int, resp ListObjectsInfo) ListObjectsResponse {
 	var contents []Object
 	var prefixes []CommonPrefix
 	var owner = Owner{}
@@ -335,15 +326,17 @@ func generateListObjectsResponse(bucket, prefix, marker, delimiter string, maxKe
 	return data
 }
 
-// generates an ListObjects response for the said bucket with other enumerated options.
-func generateListObjectsV2Response(bucket, prefix, token, startAfter, delimiter string, maxKeys int, resp ListObjectsInfo) ListObjectsV2Response {
+// generates an ListObjectsV2 response for the said bucket with other enumerated options.
+func generateListObjectsV2Response(bucket, prefix, token, startAfter, delimiter string, fetchOwner bool, maxKeys int, resp ListObjectsInfo) ListObjectsV2Response {
 	var contents []Object
 	var prefixes []CommonPrefix
 	var owner = Owner{}
 	var data = ListObjectsV2Response{}
 
-	owner.ID = "minio"
-	owner.DisplayName = "minio"
+	if fetchOwner {
+		owner.ID = "minio"
+		owner.DisplayName = "minio"
+	}
 
 	for _, object := range resp.Objects {
 		var content = Object{}
@@ -497,13 +490,18 @@ func writeSuccessNoContent(w http.ResponseWriter) {
 // writeErrorRespone write error headers
 func writeErrorResponse(w http.ResponseWriter, req *http.Request, errorCode APIErrorCode, resource string) {
 	error := getAPIError(errorCode)
-	// generate error response
-	errorResponse := getAPIErrorResponse(error, resource)
-	encodedErrorResponse := encodeResponse(errorResponse)
 	// set common headers
 	setCommonHeaders(w)
 	// write Header
 	w.WriteHeader(error.HTTPStatusCode)
+	writeErrorResponseNoHeader(w, req, errorCode, resource)
+}
+
+func writeErrorResponseNoHeader(w http.ResponseWriter, req *http.Request, errorCode APIErrorCode, resource string) {
+	error := getAPIError(errorCode)
+	// Generate error response.
+	errorResponse := getAPIErrorResponse(error, resource)
+	encodedErrorResponse := encodeResponse(errorResponse)
 	// HEAD should have no body, do not attempt to write to it
 	if req.Method != "HEAD" {
 		// write error body

cmd/api-router.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import router "github.com/gorilla/mux"
 
@@ -48,7 +48,7 @@ func registerAPIRouter(mux *router.Router, api objectAPIHandlers) {
 	// GetObject
 	bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(api.GetObjectHandler)
 	// CopyObject
-	bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", ".*?(\\/).*?").HandlerFunc(api.CopyObjectHandler)
+	bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", ".*?(\\/|%2F).*?").HandlerFunc(api.CopyObjectHandler)
 	// PutObject
 	bucket.Methods("PUT").Path("/{object:.+}").HandlerFunc(api.PutObjectHandler)
 	// DeleteObject
@@ -60,12 +60,20 @@ func registerAPIRouter(mux *router.Router, api objectAPIHandlers) {
 	bucket.Methods("GET").HandlerFunc(api.GetBucketLocationHandler).Queries("location", "")
 	// GetBucketPolicy
 	bucket.Methods("GET").HandlerFunc(api.GetBucketPolicyHandler).Queries("policy", "")
+	// GetBucketNotification
+	bucket.Methods("GET").HandlerFunc(api.GetBucketNotificationHandler).Queries("notification", "")
+	// ListenBucketNotification
+	bucket.Methods("GET").HandlerFunc(api.ListenBucketNotificationHandler).Queries("notificationARN", "{notificationARN:.*}")
 	// ListMultipartUploads
 	bucket.Methods("GET").HandlerFunc(api.ListMultipartUploadsHandler).Queries("uploads", "")
-	// ListObjects
-	bucket.Methods("GET").HandlerFunc(api.ListObjectsHandler)
+	// ListObjectsV2
+	bucket.Methods("GET").HandlerFunc(api.ListObjectsV2Handler).Queries("list-type", "2")
+	// ListObjectsV1 (Legacy)
+	bucket.Methods("GET").HandlerFunc(api.ListObjectsV1Handler)
 	// PutBucketPolicy
 	bucket.Methods("PUT").HandlerFunc(api.PutBucketPolicyHandler).Queries("policy", "")
+	// PutBucketNotification
+	bucket.Methods("PUT").HandlerFunc(api.PutBucketNotificationHandler).Queries("notification", "")
 	// PutBucket
 	bucket.Methods("PUT").HandlerFunc(api.PutBucketHandler)
 	// HeadBucket

cmd/auth-handler.go

@@ -0,0 +1,234 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 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"
+	"crypto/md5"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"io/ioutil"
+	"net/http"
+	"strings"
+)
+
+// Verify if the request http Header "x-amz-content-sha256" == "UNSIGNED-PAYLOAD"
+func isRequestUnsignedPayload(r *http.Request) bool {
+	return r.Header.Get("x-amz-content-sha256") == unsignedPayload
+}
+
+// Verify if request has JWT.
+func isRequestJWT(r *http.Request) bool {
+	return strings.HasPrefix(r.Header.Get("Authorization"), jwtAlgorithm)
+}
+
+// Verify if request has AWS Signature Version '4'.
+func isRequestSignatureV4(r *http.Request) bool {
+	return strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm)
+}
+
+// Verify if request has AWS PreSign Version '4'.
+func isRequestPresignedSignatureV4(r *http.Request) bool {
+	_, ok := r.URL.Query()["X-Amz-Credential"]
+	return ok
+}
+
+// Verify if request has AWS Post policy Signature Version '4'.
+func isRequestPostPolicySignatureV4(r *http.Request) bool {
+	return strings.Contains(r.Header.Get("Content-Type"), "multipart/form-data") && r.Method == "POST"
+}
+
+// Verify if the request has AWS Streaming Signature Version '4'. This is only valid for 'PUT' operation.
+func isRequestSignStreamingV4(r *http.Request) bool {
+	return r.Header.Get("x-amz-content-sha256") == streamingContentSHA256 && r.Method == "PUT"
+}
+
+// Verify if request has AWS Signature Version '2'.
+func isRequestSignatureV2(r *http.Request) bool {
+	return (!strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm) &&
+		strings.HasPrefix(r.Header.Get("Authorization"), signV2Algorithm))
+}
+
+// Verify request has AWS PreSign Version '2'.
+func isRequestPresignedSignatureV2(r *http.Request) bool {
+	_, ok := r.URL.Query()["AWSAccessKeyId"]
+	return ok
+}
+
+// Authorization type.
+type authType int
+
+// List of all supported auth types.
+const (
+	authTypeUnknown authType = iota
+	authTypeAnonymous
+	authTypePresigned
+	authTypePresignedV2
+	authTypePostPolicy
+	authTypeStreamingSigned
+	authTypeSigned
+	authTypeSignedV2
+	authTypeJWT
+)
+
+// Get request authentication type.
+func getRequestAuthType(r *http.Request) authType {
+	if isRequestSignatureV2(r) {
+		return authTypeSignedV2
+	} else if isRequestPresignedSignatureV2(r) {
+		return authTypePresignedV2
+	} else if isRequestSignStreamingV4(r) {
+		return authTypeStreamingSigned
+	} else if isRequestSignatureV4(r) {
+		return authTypeSigned
+	} else if isRequestPresignedSignatureV4(r) {
+		return authTypePresigned
+	} else if isRequestJWT(r) {
+		return authTypeJWT
+	} else if isRequestPostPolicySignatureV4(r) {
+		return authTypePostPolicy
+	} else if _, ok := r.Header["Authorization"]; !ok {
+		return authTypeAnonymous
+	}
+	return authTypeUnknown
+}
+
+// sum256 calculate sha256 sum for an input byte array
+func sum256(data []byte) []byte {
+	hash := sha256.New()
+	hash.Write(data)
+	return hash.Sum(nil)
+}
+
+// sumMD5 calculate md5 sum for an input byte array
+func sumMD5(data []byte) []byte {
+	hash := md5.New()
+	hash.Write(data)
+	return hash.Sum(nil)
+}
+
+// Verify if request has valid AWS Signature Version '2'.
+func isReqAuthenticatedV2(r *http.Request) (s3Error APIErrorCode) {
+	if isRequestSignatureV2(r) {
+		return doesSignV2Match(r)
+	}
+	return doesPresignV2SignatureMatch(r)
+}
+
+// Verify if request has valid AWS Signature Version '4'.
+func isReqAuthenticated(r *http.Request, region string) (s3Error APIErrorCode) {
+	if r == nil {
+		return ErrInternalError
+	}
+	payload, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		return ErrInternalError
+	}
+	// Verify Content-Md5, if payload is set.
+	if r.Header.Get("Content-Md5") != "" {
+		if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(sumMD5(payload)) {
+			return ErrBadDigest
+		}
+	}
+	// Populate back the payload.
+	r.Body = ioutil.NopCloser(bytes.NewReader(payload))
+	var sha256sum string
+	// Skips calculating sha256 on the payload on server,
+	// if client requested for it.
+	if skipContentSha256Cksum(r) {
+		sha256sum = unsignedPayload
+	} else {
+		sha256sum = hex.EncodeToString(sum256(payload))
+	}
+	if isRequestSignatureV4(r) {
+		return doesSignatureMatch(sha256sum, r, region)
+	} else if isRequestPresignedSignatureV4(r) {
+		return doesPresignedSignatureMatch(sha256sum, r, region)
+	}
+	return ErrAccessDenied
+}
+
+// checkAuth - checks for conditions satisfying the authorization of
+// the incoming request. Request should be either Presigned or Signed
+// in accordance with AWS S3 Signature V4 requirements. ErrAccessDenied
+// is returned for unhandled auth type. Once the auth type is indentified
+// request headers and body are used to calculate the signature validating
+// the client signature present in request.
+func checkAuth(r *http.Request) APIErrorCode {
+	return checkAuthWithRegion(r, serverConfig.GetRegion())
+}
+
+// checkAuthWithRegion - similar to checkAuth but takes a custom region.
+func checkAuthWithRegion(r *http.Request, region string) APIErrorCode {
+	// Validates the request for both Presigned and Signed.
+	aType := getRequestAuthType(r)
+	switch aType {
+	case authTypeSignedV2, authTypePresignedV2: // Signature V2.
+		return isReqAuthenticatedV2(r)
+	case authTypeSigned, authTypePresigned: // Signature V4.
+		return isReqAuthenticated(r, region)
+	}
+	// For all unhandled auth types return error AccessDenied.
+	return ErrAccessDenied
+}
+
+// authHandler - handles all the incoming authorization headers and validates them if possible.
+type authHandler struct {
+	handler http.Handler
+}
+
+// setAuthHandler to validate authorization header for the incoming request.
+func setAuthHandler(h http.Handler) http.Handler {
+	return authHandler{h}
+}
+
+// List of all support S3 auth types.
+var supportedS3AuthTypes = map[authType]struct{}{
+	authTypeAnonymous:       {},
+	authTypePresigned:       {},
+	authTypePresignedV2:     {},
+	authTypeSigned:          {},
+	authTypeSignedV2:        {},
+	authTypePostPolicy:      {},
+	authTypeStreamingSigned: {},
+}
+
+// Validate if the authType is valid and supported.
+func isSupportedS3AuthType(aType authType) bool {
+	_, ok := supportedS3AuthTypes[aType]
+	return ok
+}
+
+// handler for validating incoming authorization headers.
+func (a authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	aType := getRequestAuthType(r)
+	if isSupportedS3AuthType(aType) {
+		// Let top level caller validate for anonymous and known signed requests.
+		a.handler.ServeHTTP(w, r)
+		return
+	} else if aType == authTypeJWT {
+		// Validate Authorization header if its valid for JWT request.
+		if !isJWTReqAuthenticated(r) {
+			w.WriteHeader(http.StatusUnauthorized)
+			return
+		}
+		a.handler.ServeHTTP(w, r)
+		return
+	}
+	writeErrorResponse(w, r, ErrSignatureVersionNotSupported, r.URL.Path)
+}

cmd/auth-handler_test.go

@@ -0,0 +1,344 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"io"
+	"net/http"
+	"net/url"
+	"testing"
+)
+
+// Test get request auth type.
+func TestGetRequestAuthType(t *testing.T) {
+	type testCase struct {
+		req   *http.Request
+		authT authType
+	}
+	testCases := []testCase{
+		// Test case - 1
+		// Check for generic signature v4 header.
+		{
+			req: &http.Request{
+				URL: &url.URL{
+					Host:   "localhost:9000",
+					Scheme: "http",
+					Path:   "/",
+				},
+				Header: http.Header{
+					"Authorization":        []string{"AWS4-HMAC-SHA256 <cred_string>"},
+					"X-Amz-Content-Sha256": []string{streamingContentSHA256},
+				},
+				Method: "PUT",
+			},
+			authT: authTypeStreamingSigned,
+		},
+		// Test case - 2
+		// Check for JWT header.
+		{
+			req: &http.Request{
+				URL: &url.URL{
+					Host:   "localhost:9000",
+					Scheme: "http",
+					Path:   "/",
+				},
+				Header: http.Header{
+					"Authorization": []string{"Bearer 12313123"},
+				},
+			},
+			authT: authTypeJWT,
+		},
+		// Test case - 3
+		// Empty authorization header.
+		{
+			req: &http.Request{
+				URL: &url.URL{
+					Host:   "localhost:9000",
+					Scheme: "http",
+					Path:   "/",
+				},
+				Header: http.Header{
+					"Authorization": []string{""},
+				},
+			},
+			authT: authTypeUnknown,
+		},
+		// Test case - 4
+		// Check for presigned.
+		{
+			req: &http.Request{
+				URL: &url.URL{
+					Host:     "localhost:9000",
+					Scheme:   "http",
+					Path:     "/",
+					RawQuery: "X-Amz-Credential=EXAMPLEINVALIDEXAMPL%2Fs3%2F20160314%2Fus-east-1",
+				},
+			},
+			authT: authTypePresigned,
+		},
+		// Test case - 5
+		// Check for post policy.
+		{
+			req: &http.Request{
+				URL: &url.URL{
+					Host:   "localhost:9000",
+					Scheme: "http",
+					Path:   "/",
+				},
+				Header: http.Header{
+					"Content-Type": []string{"multipart/form-data"},
+				},
+				Method: "POST",
+			},
+			authT: authTypePostPolicy,
+		},
+	}
+
+	// .. Tests all request auth type.
+	for i, testc := range testCases {
+		authT := getRequestAuthType(testc.req)
+		if authT != testc.authT {
+			t.Errorf("Test %d: Expected %d, got %d", i+1, testc.authT, authT)
+		}
+	}
+}
+
+// Test all s3 supported auth types.
+func TestS3SupportedAuthType(t *testing.T) {
+	type testCase struct {
+		authT authType
+		pass  bool
+	}
+	// List of all valid and invalid test cases.
+	testCases := []testCase{
+		// Test 1 - supported s3 type anonymous.
+		{
+			authT: authTypeAnonymous,
+			pass:  true,
+		},
+		// Test 2 - supported s3 type presigned.
+		{
+			authT: authTypePresigned,
+			pass:  true,
+		},
+		// Test 3 - supported s3 type signed.
+		{
+			authT: authTypeSigned,
+			pass:  true,
+		},
+		// Test 4 - supported s3 type with post policy.
+		{
+			authT: authTypePostPolicy,
+			pass:  true,
+		},
+		// Test 5 - supported s3 type with streaming signed.
+		{
+			authT: authTypeStreamingSigned,
+			pass:  true,
+		},
+		// Test 6 - supported s3 type with signature v2.
+		{
+			authT: authTypeSignedV2,
+			pass:  true,
+		},
+		// Test 7 - supported s3 type with presign v2.
+		{
+			authT: authTypePresignedV2,
+			pass:  true,
+		},
+		// Test 8 - JWT is not supported s3 type.
+		{
+			authT: authTypeJWT,
+			pass:  false,
+		},
+		// Test 9 - unknown auth header is not supported s3 type.
+		{
+			authT: authTypeUnknown,
+			pass:  false,
+		},
+		// Test 10 - some new auth type is not supported s3 type.
+		{
+			authT: authType(9),
+			pass:  false,
+		},
+	}
+	// Validate all the test cases.
+	for i, tt := range testCases {
+		ok := isSupportedS3AuthType(tt.authT)
+		if ok != tt.pass {
+			t.Errorf("Test %d:, Expected %t, got %t", i+1, tt.pass, ok)
+		}
+	}
+}
+
+// TestIsRequestUnsignedPayload - Test validates the Unsigned payload detection logic.
+func TestIsRequestUnsignedPayload(t *testing.T) {
+	testCases := []struct {
+		inputAmzContentHeader string
+		expectedResult        bool
+	}{
+		// Test case - 1.
+		// Test case with "X-Amz-Content-Sha256" header set to empty value.
+		{"", false},
+		// Test case - 2.
+		// Test case with "X-Amz-Content-Sha256" header set to  "UNSIGNED-PAYLOAD"
+		// The payload is flagged as unsigned When "X-Amz-Content-Sha256" header is set to  "UNSIGNED-PAYLOAD".
+		{"UNSIGNED-PAYLOAD", true},
+		// Test case - 3.
+		// set to a random value.
+		{"abcd", false},
+	}
+
+	// creating an input HTTP request.
+	// Only the headers are relevant for this particular test.
+	inputReq, err := http.NewRequest("GET", "http://example.com", nil)
+	if err != nil {
+		t.Fatalf("Error initializing input HTTP request: %v", err)
+	}
+
+	for i, testCase := range testCases {
+		inputReq.Header.Set("X-Amz-Content-Sha256", testCase.inputAmzContentHeader)
+		actualResult := isRequestUnsignedPayload(inputReq)
+		if testCase.expectedResult != actualResult {
+			t.Errorf("Test %d: Expected the result to `%v`, but instead got `%v`", i+1, testCase.expectedResult, actualResult)
+		}
+	}
+}
+
+func TestIsRequestPresignedSignatureV2(t *testing.T) {
+	testCases := []struct {
+		inputQueryKey   string
+		inputQueryValue string
+		expectedResult  bool
+	}{
+		// Test case - 1.
+		// Test case with query key "AWSAccessKeyId" set.
+		{"", "", false},
+		// Test case - 2.
+		{"AWSAccessKeyId", "", true},
+		// Test case - 3.
+		{"X-Amz-Content-Sha256", "", false},
+	}
+
+	for i, testCase := range testCases {
+		// creating an input HTTP request.
+		// Only the query parameters are relevant for this particular test.
+		inputReq, err := http.NewRequest("GET", "http://example.com", nil)
+		if err != nil {
+			t.Fatalf("Error initializing input HTTP request: %v", err)
+		}
+		q := inputReq.URL.Query()
+		q.Add(testCase.inputQueryKey, testCase.inputQueryValue)
+		inputReq.URL.RawQuery = q.Encode()
+
+		actualResult := isRequestPresignedSignatureV2(inputReq)
+		if testCase.expectedResult != actualResult {
+			t.Errorf("Test %d: Expected the result to `%v`, but instead got `%v`", i+1, testCase.expectedResult, actualResult)
+		}
+	}
+}
+
+// TestIsRequestPresignedSignatureV4 - Test validates the logic for presign signature verision v4 detection.
+func TestIsRequestPresignedSignatureV4(t *testing.T) {
+	testCases := []struct {
+		inputQueryKey   string
+		inputQueryValue string
+		expectedResult  bool
+	}{
+		// Test case - 1.
+		// Test case with query key ""X-Amz-Credential" set.
+		{"", "", false},
+		// Test case - 2.
+		{"X-Amz-Credential", "", true},
+		// Test case - 3.
+		{"X-Amz-Content-Sha256", "", false},
+	}
+
+	for i, testCase := range testCases {
+		// creating an input HTTP request.
+		// Only the query parameters are relevant for this particular test.
+		inputReq, err := http.NewRequest("GET", "http://example.com", nil)
+		if err != nil {
+			t.Fatalf("Error initializing input HTTP request: %v", err)
+		}
+		q := inputReq.URL.Query()
+		q.Add(testCase.inputQueryKey, testCase.inputQueryValue)
+		inputReq.URL.RawQuery = q.Encode()
+
+		actualResult := isRequestPresignedSignatureV4(inputReq)
+		if testCase.expectedResult != actualResult {
+			t.Errorf("Test %d: Expected the result to `%v`, but instead got `%v`", i+1, testCase.expectedResult, actualResult)
+		}
+	}
+}
+
+// Provides a fully populated http request instance, fails otherwise.
+func mustNewRequest(method string, urlStr string, contentLength int64, body io.ReadSeeker, t *testing.T) *http.Request {
+	req, err := newTestRequest(method, urlStr, contentLength, body)
+	if err != nil {
+		t.Fatalf("Unable to initialize new http request %s", err)
+	}
+	return req
+}
+
+// This is similar to mustNewRequest but additionally the request
+// is signed with AWS Signature V4, fails if not able to do so.
+func mustNewSignedRequest(method string, urlStr string, contentLength int64, body io.ReadSeeker, t *testing.T) *http.Request {
+	req := mustNewRequest(method, urlStr, contentLength, body, t)
+	cred := serverConfig.GetCredential()
+	if err := signRequest(req, cred.AccessKeyID, cred.SecretAccessKey); err != nil {
+		t.Fatalf("Unable to inititalized new signed http request %s", err)
+	}
+	return req
+}
+
+// Tests is requested authenticated function, tests replies for s3 errors.
+func TestIsReqAuthenticated(t *testing.T) {
+	path, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("unable initialize config file, %s", err)
+	}
+	defer removeAll(path)
+
+	serverConfig.SetCredential(credential{"myuser", "mypassword"})
+
+	// List of test cases for validating http request authentication.
+	testCases := []struct {
+		req     *http.Request
+		s3Error APIErrorCode
+	}{
+		// When request is nil, internal error is returned.
+		{nil, ErrInternalError},
+		// When request is unsigned, access denied is returned.
+		{mustNewRequest("GET", "http://localhost:9000", 0, nil, t), ErrAccessDenied},
+		// When request is properly signed, but has bad Content-MD5 header.
+		{mustNewSignedRequest("PUT", "http://localhost:9000", 5, bytes.NewReader([]byte("hello")), t), ErrBadDigest},
+		// When request is properly signed, error is none.
+		{mustNewSignedRequest("GET", "http://localhost:9000", 0, nil, t), ErrNone},
+	}
+
+	// Validates all testcases.
+	for _, testCase := range testCases {
+		if testCase.s3Error == ErrBadDigest {
+			testCase.req.Header.Set("Content-Md5", "garbage")
+		}
+		if s3Error := isReqAuthenticated(testCase.req, serverConfig.GetRegion()); s3Error != testCase.s3Error {
+			t.Fatalf("Unexpected s3error returned wanted %d, got %d", testCase.s3Error, s3Error)
+		}
+	}
+}

cmd/benchmark-utils_test.go

@@ -0,0 +1,370 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"crypto/md5"
+	"encoding/hex"
+	"io/ioutil"
+	"math"
+	"math/rand"
+	"strconv"
+	"testing"
+	"time"
+)
+
+// Benchmark utility functions for ObjectLayer.PutObject().
+// Creates Object layer setup ( MakeBucket ) and then runs the PutObject benchmark.
+func runPutObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
+	var err error
+	// obtains random bucket name.
+	bucket := getRandomBucketName()
+	// create bucket.
+	err = obj.MakeBucket(bucket)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	// PutObject returns md5Sum of the object inserted.
+	// md5Sum variable is assigned with that value.
+	var md5Sum string
+	// get text data generated for number of bytes equal to object size.
+	textData := generateBytesData(objSize)
+	// generate md5sum for the generated data.
+	// md5sum of the data to written is required as input for PutObject.
+	hasher := md5.New()
+	hasher.Write([]byte(textData))
+	metadata := make(map[string]string)
+	metadata["md5Sum"] = hex.EncodeToString(hasher.Sum(nil))
+	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
+	b.ReportAllocs()
+	// the actual benchmark for PutObject starts here. Reset the benchmark timer.
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		// insert the object.
+		md5Sum, err = obj.PutObject(bucket, "object"+strconv.Itoa(i), int64(len(textData)), bytes.NewBuffer(textData), metadata)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if md5Sum != metadata["md5Sum"] {
+			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, md5Sum, metadata["md5Sum"])
+		}
+	}
+	// Benchmark ends here. Stop timer.
+	b.StopTimer()
+}
+
+// Benchmark utility functions for ObjectLayer.PutObjectPart().
+// Creates Object layer setup ( MakeBucket ) and then runs the PutObjectPart benchmark.
+func runPutObjectPartBenchmark(b *testing.B, obj ObjectLayer, partSize int) {
+	var err error
+	// obtains random bucket name.
+	bucket := getRandomBucketName()
+	object := getRandomObjectName()
+
+	// create bucket.
+	err = obj.MakeBucket(bucket)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	objSize := 128 * 1024 * 1024
+
+	// PutObjectPart returns md5Sum of the object inserted.
+	// md5Sum variable is assigned with that value.
+	var md5Sum, uploadID string
+	// get text data generated for number of bytes equal to object size.
+	textData := generateBytesData(objSize)
+	// generate md5sum for the generated data.
+	// md5sum of the data to written is required as input for NewMultipartUpload.
+	hasher := md5.New()
+	hasher.Write([]byte(textData))
+	metadata := make(map[string]string)
+	metadata["md5Sum"] = hex.EncodeToString(hasher.Sum(nil))
+	uploadID, err = obj.NewMultipartUpload(bucket, object, metadata)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	var textPartData []byte
+	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
+	b.ReportAllocs()
+	// the actual benchmark for PutObjectPart starts here. Reset the benchmark timer.
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		// insert the object.
+		totalPartsNR := int(math.Ceil(float64(objSize) / float64(partSize)))
+		for j := 0; j < totalPartsNR; j++ {
+			hasher.Reset()
+			if j < totalPartsNR-1 {
+				textPartData = textData[j*partSize : (j+1)*partSize-1]
+			} else {
+				textPartData = textData[j*partSize:]
+			}
+			hasher.Write([]byte(textPartData))
+			metadata := make(map[string]string)
+			metadata["md5Sum"] = hex.EncodeToString(hasher.Sum(nil))
+			md5Sum, err = obj.PutObjectPart(bucket, object, uploadID, j, int64(len(textPartData)), bytes.NewBuffer(textPartData), metadata["md5Sum"])
+			if err != nil {
+				b.Fatal(err)
+			}
+			if md5Sum != metadata["md5Sum"] {
+				b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, md5Sum, metadata["md5Sum"])
+			}
+		}
+	}
+	// Benchmark ends here. Stop timer.
+	b.StopTimer()
+}
+
+// creates XL/FS backend setup, obtains the object layer and calls the runPutObjectPartBenchmark function.
+func benchmarkPutObjectPart(b *testing.B, instanceType string, objSize int) {
+	// create a temp XL/FS backend.
+	objLayer, disks, err := makeTestBackend(instanceType)
+	if err != nil {
+		b.Fatalf("Failed obtaining Temp Backend: <ERROR> %s", err)
+	}
+	// 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) {
+	// create a temp XL/FS backend.
+	objLayer, disks, err := makeTestBackend(instanceType)
+	if err != nil {
+		b.Fatalf("Failed obtaining Temp Backend: <ERROR> %s", err)
+	}
+	// 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) {
+	// create a temp XL/FS backend.
+	objLayer, disks, err := makeTestBackend(instanceType)
+	if err != nil {
+		b.Fatalf("Failed obtaining Temp Backend: <ERROR> %s", err)
+	}
+	// 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)
+}
+
+// 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) {
+	var err error
+	// obtains random bucket name.
+	bucket := getRandomBucketName()
+	// create bucket.
+	err = obj.MakeBucket(bucket)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	// PutObject returns md5Sum of the object inserted.
+	// md5Sum variable is assigned with that value.
+	var md5Sum string
+	for i := 0; i < 10; i++ {
+		// get text data generated for number of bytes equal to object size.
+		textData := generateBytesData(objSize)
+		// generate md5sum for the generated data.
+		// md5sum of the data to written is required as input for PutObject.
+		// PutObject is the functions which writes the data onto the FS/XL backend.
+		hasher := md5.New()
+		hasher.Write([]byte(textData))
+		metadata := make(map[string]string)
+		metadata["md5Sum"] = hex.EncodeToString(hasher.Sum(nil))
+		// insert the object.
+		md5Sum, err = obj.PutObject(bucket, "object"+strconv.Itoa(i), int64(len(textData)), bytes.NewBuffer(textData), metadata)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if md5Sum != metadata["md5Sum"] {
+			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, md5Sum, metadata["md5Sum"])
+		}
+	}
+
+	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
+	b.ReportAllocs()
+	// the actual benchmark for GetObject starts here. Reset the benchmark timer.
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		var buffer = new(bytes.Buffer)
+		err = obj.GetObject(bucket, "object"+strconv.Itoa(i%10), 0, int64(objSize), buffer)
+		if err != nil {
+			b.Error(err)
+		}
+	}
+	// Benchmark ends here. Stop timer.
+	b.StopTimer()
+
+}
+
+// randomly picks a character and returns its equivalent byte array.
+func getRandomByte() []byte {
+	const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	// seeding the random number generator.
+	rand.Seed(time.Now().UnixNano())
+	var b byte
+	// pick a character randomly.
+	b = letterBytes[rand.Intn(len(letterBytes))]
+	return []byte{b}
+}
+
+// picks a random byte and repeats it to size bytes.
+func generateBytesData(size int) []byte {
+	// repeat the random character chosen size
+	return bytes.Repeat(getRandomByte(), size)
+}
+
+// creates XL/FS backend setup, obtains the object layer and calls the runGetObjectBenchmark function.
+func benchmarkGetObject(b *testing.B, instanceType string, objSize int) {
+	// create a temp XL/FS backend.
+	objLayer, disks, err := makeTestBackend(instanceType)
+	if err != nil {
+		b.Fatalf("Failed obtaining Temp Backend: <ERROR> %s", err)
+	}
+	// 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) {
+	// create a temp XL/FS backend.
+	objLayer, disks, err := makeTestBackend(instanceType)
+	if err != nil {
+		b.Fatalf("Failed obtaining Temp Backend: <ERROR> %s", err)
+	}
+	// 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)
+}
+
+// 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) {
+	var err error
+	// obtains random bucket name.
+	bucket := getRandomBucketName()
+	// create bucket.
+	err = obj.MakeBucket(bucket)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	// PutObject returns md5Sum of the object inserted.
+	// md5Sum variable is assigned with that value.
+	var md5Sum string
+	// get text data generated for number of bytes equal to object size.
+	textData := generateBytesData(objSize)
+	// generate md5sum for the generated data.
+	// md5sum of the data to written is required as input for PutObject.
+	hasher := md5.New()
+	hasher.Write([]byte(textData))
+	metadata := make(map[string]string)
+	metadata["md5Sum"] = hex.EncodeToString(hasher.Sum(nil))
+	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
+	b.ReportAllocs()
+	// the actual benchmark for PutObject starts here. Reset the benchmark timer.
+	b.ResetTimer()
+
+	b.RunParallel(func(pb *testing.PB) {
+		i := 0
+		for pb.Next() {
+			// insert the object.
+			md5Sum, err = obj.PutObject(bucket, "object"+strconv.Itoa(i), int64(len(textData)), bytes.NewBuffer(textData), metadata)
+			if err != nil {
+				b.Fatal(err)
+			}
+			if md5Sum != metadata["md5Sum"] {
+				b.Fatalf("Write no: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", md5Sum, metadata["md5Sum"])
+			}
+			i++
+		}
+	})
+
+	// Benchmark ends here. Stop timer.
+	b.StopTimer()
+}
+
+// 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) {
+	var err error
+	// obtains random bucket name.
+	bucket := getRandomBucketName()
+	// create bucket.
+	err = obj.MakeBucket(bucket)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	// PutObject returns md5Sum of the object inserted.
+	// md5Sum variable is assigned with that value.
+	var md5Sum string
+	for i := 0; i < 10; i++ {
+		// get text data generated for number of bytes equal to object size.
+		textData := generateBytesData(objSize)
+		// generate md5sum for the generated data.
+		// md5sum of the data to written is required as input for PutObject.
+		// PutObject is the functions which writes the data onto the FS/XL backend.
+		hasher := md5.New()
+		hasher.Write([]byte(textData))
+		metadata := make(map[string]string)
+		metadata["md5Sum"] = hex.EncodeToString(hasher.Sum(nil))
+		// insert the object.
+		md5Sum, err = obj.PutObject(bucket, "object"+strconv.Itoa(i), int64(len(textData)), bytes.NewBuffer(textData), metadata)
+		if err != nil {
+			b.Fatal(err)
+		}
+		if md5Sum != metadata["md5Sum"] {
+			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, md5Sum, metadata["md5Sum"])
+		}
+	}
+
+	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
+	b.ReportAllocs()
+	// the actual benchmark for GetObject starts here. Reset the benchmark timer.
+	b.ResetTimer()
+	b.RunParallel(func(pb *testing.PB) {
+		i := 0
+		for pb.Next() {
+			err = obj.GetObject(bucket, "object"+strconv.Itoa(i), 0, int64(objSize), ioutil.Discard)
+			if err != nil {
+				b.Error(err)
+			}
+			i++
+			if i == 10 {
+				i = 0
+			}
+		}
+	})
+	// Benchmark ends here. Stop timer.
+	b.StopTimer()
+
+}

cmd/bucket-handlers-listobjects.go

@@ -0,0 +1,180 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"net/http"
+	"strings"
+
+	"github.com/gorilla/mux"
+)
+
+// Validate all the ListObjects query arguments, returns an APIErrorCode
+// if one of the args do not meet the required conditions.
+// Special conditions required by Minio server are as below
+// - delimiter if set should be equal to '/', otherwise the request is rejected.
+// - marker if set should have a common prefix with 'prefix' param, otherwise
+//   the request is rejected.
+func listObjectsValidateArgs(prefix, marker, delimiter string, maxKeys int) APIErrorCode {
+	// Max keys cannot be negative.
+	if maxKeys < 0 {
+		return ErrInvalidMaxKeys
+	}
+
+	/// Minio special conditions for ListObjects.
+
+	// Verify if delimiter is anything other than '/', which we do not support.
+	if delimiter != "" && delimiter != "/" {
+		return ErrNotImplemented
+	}
+	// Marker is set validate pre-condition.
+	if marker != "" {
+		// Marker not common with prefix is not implemented.
+		if !strings.HasPrefix(marker, prefix) {
+			return ErrNotImplemented
+		}
+	}
+	// Success.
+	return ErrNone
+}
+
+// ListObjectsV2Handler - GET Bucket (List Objects) Version 2.
+// --------------------------
+// This implementation of the GET operation returns some or all (up to 1000)
+// of the objects in a bucket. You can use the request parameters as selection
+// criteria to return a subset of the objects in a bucket.
+//
+// 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) {
+	vars := mux.Vars(r)
+	bucket := vars["bucket"]
+
+	switch getRequestAuthType(r) {
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
+		return
+	case authTypeAnonymous:
+		// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
+		if s3Error := enforceBucketPolicy(bucket, "s3:ListBucket", r.URL); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		if s3Error := isReqAuthenticatedV2(r); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypeSigned, authTypePresigned:
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	}
+	// Extract all the listObjectsV2 query params to their native values.
+	prefix, token, startAfter, delimiter, fetchOwner, maxKeys, _ := getListObjectsV2Args(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
+	}
+	// Validate the query params before beginning to serve the request.
+	// fetch-owner is not validated since it is a boolean
+	if s3Error := listObjectsValidateArgs(prefix, marker, delimiter, maxKeys); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+	// 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.
+	listObjectsInfo, err := api.ObjectAPI.ListObjects(bucket, prefix, marker, delimiter, maxKeys)
+	if err != nil {
+		errorIf(err, "Unable to list objects.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+
+	response := generateListObjectsV2Response(bucket, prefix, token, startAfter, delimiter, fetchOwner, maxKeys, listObjectsInfo)
+	// Write headers
+	setCommonHeaders(w)
+	// Write success response.
+	writeSuccessResponse(w, encodeResponse(response))
+}
+
+// ListObjectsV1Handler - GET Bucket (List Objects) Version 1.
+// --------------------------
+// This implementation of the GET operation returns some or all (up to 1000)
+// of the objects in a bucket. You can use the request parameters as selection
+// criteria to return a subset of the objects in a bucket.
+//
+func (api objectAPIHandlers) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	bucket := vars["bucket"]
+
+	switch getRequestAuthType(r) {
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
+		return
+	case authTypeAnonymous:
+		// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
+		if s3Error := enforceBucketPolicy(bucket, "s3:ListBucket", r.URL); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		if s3Error := isReqAuthenticatedV2(r); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypeSigned, authTypePresigned:
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	}
+
+	// Extract all the litsObjectsV1 query params to their native values.
+	prefix, marker, delimiter, maxKeys, _ := getListObjectsV1Args(r.URL.Query())
+
+	// Validate all the query params before beginning to serve the request.
+	if s3Error := listObjectsValidateArgs(prefix, marker, delimiter, maxKeys); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+
+	// 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.
+	listObjectsInfo, err := api.ObjectAPI.ListObjects(bucket, prefix, marker, delimiter, maxKeys)
+	if err != nil {
+		errorIf(err, "Unable to list objects.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+	response := generateListObjectsV1Response(bucket, prefix, marker, delimiter, maxKeys, listObjectsInfo)
+	// Write headers
+	setCommonHeaders(w)
+	// Write success response.
+	writeSuccessResponse(w, encodeResponse(response))
+}

cmd/bucket-handlers.go

@@ -14,57 +14,44 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
-	"bytes"
-	"encoding/base64"
-	"encoding/hex"
 	"encoding/xml"
 	"io"
-	"io/ioutil"
-	"mime/multipart"
 	"net/http"
 	"net/url"
+	"path"
 	"strings"
+	"sync"
 
 	mux "github.com/gorilla/mux"
+	"github.com/minio/minio-go/pkg/set"
 )
 
 // http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
-func enforceBucketPolicy(action string, bucket string, reqURL *url.URL) (s3Error APIErrorCode) {
-	// Read saved bucket policy.
-	policy, err := readBucketPolicy(bucket)
-	if err != nil {
-		errorIf(err, "Unable read bucket policy.")
-		switch err.(type) {
-		case BucketNotFound:
-			return ErrNoSuchBucket
-		case BucketNameInvalid:
-			return ErrInvalidBucketName
-		default:
-			// For any other error just return AccessDenied.
-			return ErrAccessDenied
-		}
+// Enforces bucket policies for a bucket for a given tatusaction.
+func enforceBucketPolicy(bucket string, action string, reqURL *url.URL) (s3Error APIErrorCode) {
+	if !IsValidBucketName(bucket) {
+		return ErrInvalidBucketName
 	}
-	// Parse the saved policy.
-	bucketPolicy, err := parseBucketPolicy(policy)
-	if err != nil {
-		errorIf(err, "Unable to parse bucket policy.")
+	// Fetch bucket policy, if policy is not set return access denied.
+	policy := globalBucketPolicies.GetBucketPolicy(bucket)
+	if policy == nil {
 		return ErrAccessDenied
 	}
 
 	// Construct resource in 'arn:aws:s3:::examplebucket/object' format.
-	resource := AWSResourcePrefix + strings.TrimPrefix(reqURL.Path, "/")
+	resource := AWSResourcePrefix + strings.TrimSuffix(strings.TrimPrefix(reqURL.Path, "/"), "/")
 
 	// Get conditions for policy verification.
-	conditions := make(map[string]string)
+	conditionKeyMap := make(map[string]set.StringSet)
 	for queryParam := range reqURL.Query() {
-		conditions[queryParam] = reqURL.Query().Get(queryParam)
+		conditionKeyMap[queryParam] = set.CreateStringSet(reqURL.Query().Get(queryParam))
 	}
 
 	// Validate action, resource and conditions with current policy statements.
-	if !bucketPolicyEvalStatements(action, resource, conditions, bucketPolicy.Statements) {
+	if !bucketPolicyEvalStatements(action, resource, conditionKeyMap, policy.Statements) {
 		return ErrAccessDenied
 	}
 	return ErrNone
@@ -84,33 +71,18 @@ func (api objectAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *
 		return
 	case authTypeAnonymous:
 		// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
-		if s3Error := enforceBucketPolicy("s3:GetBucketLocation", bucket, r.URL); s3Error != ErrNone {
+		if s3Error := enforceBucketPolicy(bucket, "s3:GetBucketLocation", r.URL); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		if s3Error := isReqAuthenticatedV2(r); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
 	case authTypeSigned, authTypePresigned:
-		payload, err := ioutil.ReadAll(r.Body)
-		if err != nil {
-			writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
-			return
-		}
-		// Verify Content-Md5, if payload is set.
-		if r.Header.Get("Content-Md5") != "" {
-			if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(sumMD5(payload)) {
-				writeErrorResponse(w, r, ErrBadDigest, r.URL.Path)
-				return
-			}
-		}
-		// Populate back the payload.
-		r.Body = ioutil.NopCloser(bytes.NewReader(payload))
-		var s3Error APIErrorCode // API error code.
-		validateRegion := false  // Validate region.
-		if isRequestSignatureV4(r) {
-			s3Error = doesSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
-		} else if isRequestPresignedSignatureV4(r) {
-			s3Error = doesPresignedSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
-		}
-		if s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, "us-east-1"); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
@@ -154,12 +126,18 @@ func (api objectAPIHandlers) ListMultipartUploadsHandler(w http.ResponseWriter,
 		return
 	case authTypeAnonymous:
 		// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
-		if s3Error := enforceBucketPolicy("s3:ListBucketMultipartUploads", bucket, r.URL); s3Error != ErrNone {
+		if s3Error := enforceBucketPolicy(bucket, "s3:ListBucketMultipartUploads", r.URL); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		if s3Error := isReqAuthenticatedV2(r); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
@@ -193,141 +171,32 @@ func (api objectAPIHandlers) ListMultipartUploadsHandler(w http.ResponseWriter,
 	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
-// ListObjectsHandler - GET Bucket (List Objects)
-// -- -----------------------
-// This implementation of the GET operation returns some or all (up to 1000)
-// of the objects in a bucket. You can use the request parameters as selection
-// criteria to return a subset of the objects in a bucket.
-//
-func (api objectAPIHandlers) ListObjectsHandler(w http.ResponseWriter, r *http.Request) {
-	vars := mux.Vars(r)
-	bucket := vars["bucket"]
-
-	switch getRequestAuthType(r) {
-	default:
-		// For all unknown auth types return error.
-		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
-		return
-	case authTypeAnonymous:
-		// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
-		if s3Error := enforceBucketPolicy("s3:ListBucket", bucket, r.URL); s3Error != ErrNone {
-			writeErrorResponse(w, r, s3Error, r.URL.Path)
-			return
-		}
-	case authTypeSigned, authTypePresigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
-			writeErrorResponse(w, r, s3Error, r.URL.Path)
-			return
-		}
-	}
-	var prefix, marker, token, delimiter, startAfter string
-	var maxkeys int
-	var listV2 bool
-	// TODO handle encoding type.
-	if r.URL.Query().Get("list-type") == "2" {
-		listV2 = true
-		prefix, token, startAfter, delimiter, maxkeys, _ = getListObjectsV2Args(r.URL.Query())
-		// For ListV2 "start-after" is considered only if "continuation-token" is empty.
-		if token == "" {
-			marker = startAfter
-		} else {
-			marker = token
-		}
-	} else {
-		prefix, marker, delimiter, maxkeys, _ = getListObjectsV1Args(r.URL.Query())
-	}
-	if maxkeys < 0 {
-		writeErrorResponse(w, r, ErrInvalidMaxKeys, r.URL.Path)
-		return
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != "/" {
-		writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
-		return
-	}
-	// If marker is set unescape.
-	if marker != "" {
-		// Marker not common with prefix is not implemented.
-		if !strings.HasPrefix(marker, prefix) {
-			writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
-			return
-		}
-	}
-
-	listObjectsInfo, err := api.ObjectAPI.ListObjects(bucket, prefix, marker, delimiter, maxkeys)
-
-	if err == nil {
-		var encodedSuccessResponse []byte
-		// generate response
-		if listV2 {
-			response := generateListObjectsV2Response(bucket, prefix, token, startAfter, delimiter, maxkeys, listObjectsInfo)
-			encodedSuccessResponse = encodeResponse(response)
-		} else {
-			response := generateListObjectsResponse(bucket, prefix, marker, delimiter, maxkeys, listObjectsInfo)
-			encodedSuccessResponse = encodeResponse(response)
-		}
-		// Write headers
-		setCommonHeaders(w)
-		// Write success response.
-		writeSuccessResponse(w, encodedSuccessResponse)
-		return
-	}
-	errorIf(err, "Unable to list objects.")
-	writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
-}
-
 // ListBucketsHandler - GET Service
 // -----------
 // 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) {
-	// List buckets does not support bucket policies.
-	switch getRequestAuthType(r) {
-	default:
-		// For all unknown auth types return error.
-		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
+	// List buckets does not support bucket policies, no need to enforce it.
+	// Proceed to validate signature. Validates the request for both Presigned and Signed.
+	if s3Error := checkAuthWithRegion(r, ""); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
 		return
-	case authTypeSigned, authTypePresigned:
-		payload, e := ioutil.ReadAll(r.Body)
-		if e != nil {
-			writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
-			return
-		}
-		// Verify Content-Md5, if payload is set.
-		if r.Header.Get("Content-Md5") != "" {
-			if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(sumMD5(payload)) {
-				writeErrorResponse(w, r, ErrBadDigest, r.URL.Path)
-				return
-			}
-		}
-		// Populate back the payload.
-		r.Body = ioutil.NopCloser(bytes.NewReader(payload))
-		var s3Error APIErrorCode // API error code.
-		validateRegion := false  // Validate region.
-		if isRequestSignatureV4(r) {
-			s3Error = doesSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
-		} else if isRequestPresignedSignatureV4(r) {
-			s3Error = doesPresignedSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
-		}
-		if s3Error != ErrNone {
-			writeErrorResponse(w, r, s3Error, r.URL.Path)
-			return
-		}
 	}
 
 	bucketsInfo, err := api.ObjectAPI.ListBuckets()
-	if err == nil {
-		// generate response
-		response := generateListBucketsResponse(bucketsInfo)
-		encodedSuccessResponse := encodeResponse(response)
-		// write headers
-		setCommonHeaders(w)
-		// write response
-		writeSuccessResponse(w, encodedSuccessResponse)
+	if err != nil {
+		errorIf(err, "Unable to list buckets.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
 		return
 	}
-	errorIf(err, "Unable to list buckets.")
-	writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+
+	// Generate response.
+	response := generateListBucketsResponse(bucketsInfo)
+	encodedSuccessResponse := encodeResponse(response)
+	// Write headers.
+	setCommonHeaders(w)
+	// Write response.
+	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
 // DeleteMultipleObjectsHandler - deletes multiple objects.
@@ -342,12 +211,18 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 		return
 	case authTypeAnonymous:
 		// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
-		if s3Error := enforceBucketPolicy("s3:DeleteObject", bucket, r.URL); s3Error != ErrNone {
+		if s3Error := enforceBucketPolicy(bucket, "s3:DeleteObject", r.URL); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		if s3Error := isReqAuthenticatedV2(r); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
@@ -385,24 +260,47 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 		return
 	}
 
-	var deleteErrors []DeleteError
-	var deletedObjects []ObjectIdentifier
-	// Loop through all the objects and delete them sequentially.
-	for _, object := range deleteObjects.Objects {
-		err := api.ObjectAPI.DeleteObject(bucket, object.ObjectName)
-		if err == nil {
-			deletedObjects = append(deletedObjects, ObjectIdentifier{
-				ObjectName: object.ObjectName,
-			})
-		} else {
-			errorIf(err, "Unable to delete object.")
-			deleteErrors = append(deleteErrors, DeleteError{
-				Code:    errorCodeResponse[toAPIErrorCode(err)].Code,
-				Message: errorCodeResponse[toAPIErrorCode(err)].Description,
-				Key:     object.ObjectName,
-			})
-		}
+	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()
+			dErr := api.ObjectAPI.DeleteObject(bucket, obj.ObjectName)
+			if dErr != nil {
+				dErrs[i] = dErr
+			}
+		}(index, object)
 	}
+	wg.Wait()
+
+	// Collect deleted objects and errors if any.
+	var deletedObjects []ObjectIdentifier
+	var deleteErrors []DeleteError
+	for index, err := range dErrs {
+		object := deleteObjects.Objects[index]
+		// Success deleted objects are collected separately.
+		if err == nil {
+			deletedObjects = append(deletedObjects, object)
+			continue
+		}
+		if _, ok := err.(ObjectNotFound); ok {
+			// If the object is not found it should be
+			// accounted as deleted as per S3 spec.
+			deletedObjects = append(deletedObjects, object)
+			continue
+		}
+		errorIf(err, "Unable to delete object. %s", object.ObjectName)
+		// Error during delete should be collected separately.
+		deleteErrors = append(deleteErrors, DeleteError{
+			Code:    errorCodeResponse[toAPIErrorCode(err)].Code,
+			Message: errorCodeResponse[toAPIErrorCode(err)].Description,
+			Key:     object.ObjectName,
+		})
+	}
+
 	// Generate response
 	response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors)
 	encodedSuccessResponse := encodeResponse(response)
@@ -410,37 +308,45 @@ func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter,
 	setCommonHeaders(w)
 	// Write success response.
 	writeSuccessResponse(w, encodedSuccessResponse)
+
+	if globalEventNotifier.IsBucketNotificationSet(bucket) {
+		// Notify deleted event for objects.
+		for _, dobj := range deletedObjects {
+			eventNotify(eventData{
+				Type:   ObjectRemovedDelete,
+				Bucket: bucket,
+				ObjInfo: ObjectInfo{
+					Name: dobj.ObjectName,
+				},
+				ReqParams: map[string]string{
+					"sourceIPAddress": r.RemoteAddr,
+				},
+			})
+		}
+	}
 }
 
 // PutBucketHandler - PUT Bucket
 // ----------
 // This implementation of the PUT operation creates a new bucket for authenticated request
 func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Request) {
+	// PutBucket does not support policies, use checkAuth to validate signature.
+	if s3Error := checkAuthWithRegion(r, "us-east-1"); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
 
-	// Set http request for signature.
-	switch getRequestAuthType(r) {
-	default:
-		// For all unknown auth types return error.
-		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
+	// Validate if incoming location constraint is valid, reject
+	// requests which do not follow valid region requirements.
+	if s3Error := isValidLocationConstraint(r); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
 		return
-	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
-			writeErrorResponse(w, r, s3Error, r.URL.Path)
-			return
-		}
 	}
 
-	// the location value in the request body should match the Region in serverConfig.
-	// other values of location are not accepted.
-	// make bucket fails in such cases.
-	errCode := isValidLocationContraint(r.Body, serverConfig.GetRegion())
-	if errCode != ErrNone {
-		writeErrorResponse(w, r, errCode, r.URL.Path)
-		return
-	}
-	// Make bucket.
+	// Proceed to creating a bucket.
 	err := api.ObjectAPI.MakeBucket(bucket)
 	if err != nil {
 		errorIf(err, "Unable to create a bucket.")
@@ -452,32 +358,6 @@ func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Req
 	writeSuccessResponse(w, nil)
 }
 
-func extractHTTPFormValues(reader *multipart.Reader) (io.Reader, map[string]string, error) {
-	/// HTML Form values
-	formValues := make(map[string]string)
-	filePart := new(bytes.Buffer)
-	var err error
-	for err == nil {
-		var part *multipart.Part
-		part, err = reader.NextPart()
-		if part != nil {
-			if part.FileName() == "" {
-				var buffer []byte
-				buffer, err = ioutil.ReadAll(part)
-				if err != nil {
-					return nil, nil, err
-				}
-				formValues[http.CanonicalHeaderKey(part.FormName())] = string(buffer)
-			} else {
-				if _, err = io.Copy(filePart, part); err != nil {
-					return nil, nil, err
-				}
-			}
-		}
-	}
-	return filePart, formValues, nil
-}
-
 // PostPolicyBucketHandler - POST policy
 // ----------
 // This implementation of the POST operation handles object creation with a specified
@@ -492,7 +372,7 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 		return
 	}
 
-	fileBody, formValues, err := extractHTTPFormValues(reader)
+	fileBody, fileName, formValues, err := extractPostPolicyFormValues(reader)
 	if err != nil {
 		errorIf(err, "Unable to parse form values.")
 		writeErrorResponse(w, r, ErrMalformedPOSTRequest, r.URL.Path)
@@ -502,6 +382,12 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	formValues["Bucket"] = bucket
 	object := formValues["Key"]
 
+	if fileName != "" && strings.Contains(object, "${filename}") {
+		// S3 feature to replace ${filename} found in Key form field
+		// by the filename attribute passed in multipart
+		object = strings.Replace(object, "${filename}", fileName, -1)
+	}
+
 	// Verify policy signature.
 	apiErr := doesPolicySignatureMatch(formValues)
 	if apiErr != ErrNone {
@@ -526,14 +412,34 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 	if md5Sum != "" {
 		w.Header().Set("ETag", "\""+md5Sum+"\"")
 	}
-	encodedSuccessResponse := encodeResponse(PostResponse{
-		Location: getObjectLocation(bucket, object), // TODO Full URL is preferred
-		Bucket:   bucket,
-		Key:      object,
-		ETag:     md5Sum,
-	})
+
+	// TODO full URL is preferred.
+	w.Header().Set("Location", getObjectLocation(bucket, object))
+
+	// Set common headers.
 	setCommonHeaders(w)
-	writeSuccessResponse(w, encodedSuccessResponse)
+
+	// Write successful response.
+	writeSuccessNoContent(w)
+
+	if globalEventNotifier.IsBucketNotificationSet(bucket) {
+		// Fetch object info for notifications.
+		objInfo, err := api.ObjectAPI.GetObjectInfo(bucket, object)
+		if err != nil {
+			errorIf(err, "Unable to fetch object info for \"%s\"", path.Join(bucket, object))
+			return
+		}
+
+		// Notify object created event.
+		eventNotify(eventData{
+			Type:    ObjectCreatedPost,
+			Bucket:  bucket,
+			ObjInfo: objInfo,
+			ReqParams: map[string]string{
+				"sourceIPAddress": r.RemoteAddr,
+			},
+		})
+	}
 }
 
 // HeadBucketHandler - HEAD Bucket
@@ -553,12 +459,18 @@ func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Re
 		return
 	case authTypeAnonymous:
 		// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
-		if s3Error := enforceBucketPolicy("s3:ListBucket", bucket, r.URL); s3Error != ErrNone {
+		if s3Error := enforceBucketPolicy(bucket, "s3:ListBucket", r.URL); s3Error != ErrNone {
+			writeErrorResponse(w, r, s3Error, r.URL.Path)
+			return
+		}
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		if s3Error := isReqAuthenticatedV2(r); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
@@ -574,21 +486,16 @@ func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Re
 
 // DeleteBucketHandler - Delete bucket
 func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
+	// DeleteBucket does not support bucket policies, use checkAuth to validate signature.
+	if s3Error := checkAuth(r); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
 
-	switch getRequestAuthType(r) {
-	default:
-		// For all unknown auth types return error.
-		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
-		return
-	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
-			writeErrorResponse(w, r, s3Error, r.URL.Path)
-			return
-		}
-	}
-
+	// Attempt to delete bucket.
 	if err := api.ObjectAPI.DeleteBucket(bucket); err != nil {
 		errorIf(err, "Unable to delete a bucket.")
 		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
@@ -596,7 +503,10 @@ func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.
 	}
 
 	// Delete bucket access policy, if present - ignore any errors.
-	removeBucketPolicy(bucket)
+	removeBucketPolicy(bucket, api.ObjectAPI)
+
+	// Delete notification config, if present - ignore any errors.
+	removeNotificationConfig(bucket, api.ObjectAPI)
 
 	// Write success response.
 	writeSuccessNoContent(w)

cmd/bucket-notification-datatypes.go

@@ -0,0 +1,175 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"encoding/xml"
+	"errors"
+)
+
+// Represents the criteria for the filter rule.
+type filterRule struct {
+	Name  string `xml:"Name"`
+	Value string `xml:"Value"`
+}
+
+// Collection of filter rules per service config.
+type keyFilter struct {
+	FilterRules []filterRule `xml:"FilterRule,omitempty"`
+}
+
+// Common elements of service notification.
+type serviceConfig struct {
+	Events []string `xml:"Event"`
+	Filter struct {
+		Key keyFilter `xml:"S3Key,omitempty"`
+	}
+	ID string `xml:"Id"`
+}
+
+// Queue SQS configuration.
+type queueConfig struct {
+	serviceConfig
+	QueueARN string `xml:"Queue"`
+}
+
+// Topic SNS configuration, this is a compliance field not used by minio yet.
+type topicConfig struct {
+	serviceConfig
+	TopicARN string `xml:"Topic"`
+}
+
+// Lambda function configuration, this is a compliance field not used by minio yet.
+type lambdaConfig struct {
+	serviceConfig
+	LambdaARN string `xml:"CloudFunction"`
+}
+
+// Notification configuration structure represents the XML format of
+// notification configuration of buckets.
+type notificationConfig struct {
+	XMLName       xml.Name       `xml:"NotificationConfiguration"`
+	QueueConfigs  []queueConfig  `xml:"QueueConfiguration"`
+	TopicConfigs  []topicConfig  `xml:"TopicConfiguration"`
+	LambdaConfigs []lambdaConfig `xml:"CloudFunctionConfiguration"`
+}
+
+// Internal error used to signal notifications not set.
+var errNoSuchNotifications = errors.New("The specified bucket does not have bucket notifications")
+
+// EventName is AWS S3 event type:
+// http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html
+type EventName int
+
+const (
+	// ObjectCreatedPut is s3:ObjectCreated:Put
+	ObjectCreatedPut EventName = iota
+	// ObjectCreatedPost is s3:ObjectCreated:Post
+	ObjectCreatedPost
+	// ObjectCreatedCopy is s3:ObjectCreated:Copy
+	ObjectCreatedCopy
+	// ObjectCreatedCompleteMultipartUpload is s3:ObjectCreated:CompleteMultipartUpload
+	ObjectCreatedCompleteMultipartUpload
+	// ObjectRemovedDelete is s3:ObjectRemoved:Delete
+	ObjectRemovedDelete
+)
+
+// Stringer interface for event name.
+func (eventName EventName) String() string {
+	switch eventName {
+	case ObjectCreatedPut:
+		return "s3:ObjectCreated:Put"
+	case ObjectCreatedPost:
+		return "s3:ObjectCreated:Post"
+	case ObjectCreatedCopy:
+		return "s3:ObjectCreated:Copy"
+	case ObjectCreatedCompleteMultipartUpload:
+		return "s3:ObjectCreated:CompleteMultipartUpload"
+	case ObjectRemovedDelete:
+		return "s3:ObjectRemoved:Delete"
+	default:
+		return "s3:Unknown"
+	}
+}
+
+// Indentity represents the user id, this is a compliance field.
+type identity struct {
+	PrincipalID string `json:"principalId"`
+}
+
+func defaultIdentity() identity {
+	return identity{"minio"}
+}
+
+// Notification event bucket metadata.
+type bucketMeta struct {
+	Name          string   `json:"name"`
+	OwnerIdentity identity `json:"ownerIdentity"`
+	ARN           string   `json:"arn"`
+}
+
+// Notification event object metadata.
+type objectMeta struct {
+	Key       string `json:"key"`
+	Size      int64  `json:"size,omitempty"`
+	ETag      string `json:"eTag,omitempty"`
+	VersionID string `json:"versionId,omitempty"`
+	Sequencer string `json:"sequencer"`
+}
+
+// Notification event server specific metadata.
+type eventMeta struct {
+	SchemaVersion   string     `json:"s3SchemaVersion"`
+	ConfigurationID string     `json:"configurationId"`
+	Bucket          bucketMeta `json:"bucket"`
+	Object          objectMeta `json:"object"`
+}
+
+// NotificationEvent represents an Amazon an S3 bucket notification event.
+type NotificationEvent struct {
+	EventVersion      string            `json:"eventVersion"`
+	EventSource       string            `json:"eventSource"`
+	AwsRegion         string            `json:"awsRegion"`
+	EventTime         string            `json:"eventTime"`
+	EventName         string            `json:"eventName"`
+	UserIdentity      identity          `json:"userIdentity"`
+	RequestParameters map[string]string `json:"requestParameters"`
+	ResponseElements  map[string]string `json:"responseElements"`
+	S3                eventMeta         `json:"s3"`
+}
+
+// Represents the minio topic type and account id's.
+type arnTopic struct {
+	Type      string
+	AccountID string
+}
+
+// Stringer for constructing AWS ARN compatible string.
+func (m arnTopic) String() string {
+	return minioTopic + serverConfig.GetRegion() + ":" + m.AccountID + ":" + m.Type
+}
+
+// Represents the minio sqs type and account id's.
+type arnSQS struct {
+	Type      string
+	AccountID string
+}
+
+// Stringer for constructing AWS ARN compatible string.
+func (m arnSQS) String() string {
+	return minioSqs + serverConfig.GetRegion() + ":" + m.AccountID + ":" + m.Type
+}

cmd/bucket-notification-handlers.go

@@ -0,0 +1,269 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"encoding/json"
+	"encoding/xml"
+	"io"
+	"net/http"
+	"path"
+	"time"
+
+	"github.com/gorilla/mux"
+)
+
+const (
+	bucketConfigPrefix       = "buckets"
+	bucketNotificationConfig = "notification.xml"
+)
+
+// GetBucketNotificationHandler - This implementation of the GET
+// operation uses the notification subresource to return the
+// notification configuration of a bucket. If notifications are
+// not enabled on the bucket, the operation returns an empty
+// NotificationConfiguration element.
+func (api objectAPIHandlers) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
+	// Validate request authorization.
+	if s3Error := checkAuth(r); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+	vars := mux.Vars(r)
+	bucket := vars["bucket"]
+	// Attempt to successfully load notification config.
+	nConfig, err := loadNotificationConfig(bucket, api.ObjectAPI)
+	if err != nil && err != errNoSuchNotifications {
+		errorIf(err, "Unable to read notification configuration.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+	// For no notifications we write a dummy XML.
+	if err == errNoSuchNotifications {
+		// Complies with the s3 behavior in this regard.
+		nConfig = &notificationConfig{}
+	}
+	notificationBytes, err := xml.Marshal(nConfig)
+	if err != nil {
+		// For any marshalling failure.
+		errorIf(err, "Unable to marshal notification configuration into XML.", err)
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+	// Success.
+	writeSuccessResponse(w, notificationBytes)
+}
+
+// PutBucketNotificationHandler - Minio notification feature enables
+// you to receive notifications when certain events happen in your bucket.
+// Using this API, you can replace an existing notification configuration.
+// The configuration is an XML file that defines the event types that you
+// want Minio to publish and the destination where you want Minio to publish
+// an event notification when it detects an event of the specified type.
+// By default, your bucket has no event notifications configured. That is,
+// the notification configuration will be an empty NotificationConfiguration.
+func (api objectAPIHandlers) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
+	// Validate request authorization.
+	if s3Error := checkAuth(r); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+	vars := mux.Vars(r)
+	bucket := vars["bucket"]
+
+	_, err := api.ObjectAPI.GetBucketInfo(bucket)
+	if err != nil {
+		errorIf(err, "Unable to find bucket info.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+
+	// If Content-Length is unknown or zero, deny the request. PutBucketNotification
+	// always needs a Content-Length if incoming request is not chunked.
+	if !contains(r.TransferEncoding, "chunked") {
+		if r.ContentLength == -1 {
+			writeErrorResponse(w, r, ErrMissingContentLength, r.URL.Path)
+			return
+		}
+	}
+
+	// Reads the incoming notification configuration.
+	var buffer bytes.Buffer
+	var bufferSize int64
+	if r.ContentLength >= 0 {
+		bufferSize, err = io.CopyN(&buffer, r.Body, r.ContentLength)
+	} else {
+		bufferSize, err = io.Copy(&buffer, r.Body)
+	}
+	if err != nil {
+		errorIf(err, "Unable to read incoming body.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+
+	var notificationCfg notificationConfig
+	// Unmarshal notification bytes.
+	notificationConfigBytes := buffer.Bytes()
+	if err = xml.Unmarshal(notificationConfigBytes, &notificationCfg); err != nil {
+		errorIf(err, "Unable to parse notification configuration XML.")
+		writeErrorResponse(w, r, ErrMalformedXML, r.URL.Path)
+		return
+	} // Successfully marshalled notification configuration.
+
+	// Validate unmarshalled bucket notification configuration.
+	if s3Error := validateNotificationConfig(notificationCfg); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+
+	// Proceed to save notification configuration.
+	notificationConfigPath := path.Join(bucketConfigPrefix, bucket, bucketNotificationConfig)
+	_, err = api.ObjectAPI.PutObject(minioMetaBucket, notificationConfigPath, bufferSize, bytes.NewReader(buffer.Bytes()), nil)
+	if err != nil {
+		errorIf(err, "Unable to write bucket notification configuration.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+
+	// Set bucket notification config.
+	globalEventNotifier.SetBucketNotificationConfig(bucket, &notificationCfg)
+
+	// Success.
+	writeSuccessResponse(w, nil)
+}
+
+// writeNotification marshals notification message before writing to client.
+func writeNotification(w http.ResponseWriter, notification map[string][]NotificationEvent) error {
+	// Invalid response writer.
+	if w == nil {
+		return errInvalidArgument
+	}
+	// Invalid notification input.
+	if notification == nil {
+		return errInvalidArgument
+	}
+	// Marshal notification data into XML and write to client.
+	notificationBytes, err := json.Marshal(&notification)
+	if err != nil {
+		return err
+	}
+	// Add additional CRLF characters for client to
+	// differentiate the individual events properly.
+	_, err = w.Write(append(notificationBytes, crlf...))
+	// Make sure we have flushed, this would set Transfer-Encoding: chunked.
+	w.(http.Flusher).Flush()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// CRLF character used for chunked transfer in accordance with HTTP standards.
+var crlf = []byte("\r\n")
+
+// sendBucketNotification - writes notification back to client on the response writer
+// for each notification input, otherwise writes whitespace characters periodically
+// to keep the connection active. Each notification messages are terminated by CRLF
+// character. Upon any error received on response writer the for loop exits.
+//
+// TODO - do not log for all errors.
+func sendBucketNotification(w http.ResponseWriter, arnListenerCh <-chan []NotificationEvent) {
+	var dummyEvents = map[string][]NotificationEvent{"Records": nil}
+	// Continuously write to client either timely empty structures
+	// every 5 seconds, or return back the notifications.
+	for {
+		select {
+		case events := <-arnListenerCh:
+			if err := writeNotification(w, map[string][]NotificationEvent{"Records": events}); err != nil {
+				errorIf(err, "Unable to write notification to client.")
+				return
+			}
+		case <-time.After(5 * time.Second):
+			if err := writeNotification(w, dummyEvents); err != nil {
+				errorIf(err, "Unable to write notification to client.")
+				return
+			}
+		}
+	}
+}
+
+// ListenBucketNotificationHandler - list bucket notifications.
+func (api objectAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
+	// Validate request authorization.
+	if s3Error := checkAuth(r); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+	vars := mux.Vars(r)
+	bucket := vars["bucket"]
+
+	// Get notification ARN.
+	topicARN := r.URL.Query().Get("notificationARN")
+	if topicARN == "" {
+		writeErrorResponse(w, r, ErrARNNotification, r.URL.Path)
+		return
+	}
+
+	// Validate if bucket exists.
+	_, err := api.ObjectAPI.GetBucketInfo(bucket)
+	if err != nil {
+		errorIf(err, "Unable to bucket info.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
+		return
+	}
+
+	notificationCfg := globalEventNotifier.GetBucketNotificationConfig(bucket)
+	if notificationCfg == nil {
+		writeErrorResponse(w, r, ErrARNNotification, r.URL.Path)
+		return
+	}
+
+	// Set SNS notifications only if special "listen" sns is set in bucket
+	// notification configs.
+	if !isMinioSNSConfigured(topicARN, notificationCfg.TopicConfigs) {
+		writeErrorResponse(w, r, ErrARNNotification, r.URL.Path)
+		return
+	}
+
+	// Add all common headers.
+	setCommonHeaders(w)
+
+	// Create a new notification event channel.
+	nEventCh := make(chan []NotificationEvent)
+	// Close the listener channel.
+	defer close(nEventCh)
+
+	// Set sns target.
+	globalEventNotifier.SetSNSTarget(topicARN, nEventCh)
+	// Remove sns listener after the writer has closed or the client disconnected.
+	defer globalEventNotifier.RemoveSNSTarget(topicARN, nEventCh)
+
+	// Start sending bucket notifications.
+	sendBucketNotification(w, nEventCh)
+}
+
+// Removes notification.xml for a given bucket, only used during DeleteBucket.
+func removeNotificationConfig(bucket string, objAPI ObjectLayer) error {
+	// Verify bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+
+	notificationConfigPath := path.Join(bucketConfigPrefix, bucket, bucketNotificationConfig)
+	return objAPI.DeleteObject(minioMetaBucket, notificationConfigPath)
+}

cmd/bucket-notification-handlers_test.go

@@ -0,0 +1,90 @@
+package cmd
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"testing"
+)
+
+// Implement a dummy flush writer.
+type flushWriter struct {
+	io.Writer
+}
+
+// Flush writer is a dummy writer compatible with http.Flusher and http.ResponseWriter.
+func (f *flushWriter) Flush()                            {}
+func (f *flushWriter) Write(b []byte) (n int, err error) { return f.Writer.Write(b) }
+func (f *flushWriter) Header() http.Header               { return http.Header{} }
+func (f *flushWriter) WriteHeader(code int)              {}
+
+func newFlushWriter(writer io.Writer) *flushWriter {
+	return &flushWriter{writer}
+}
+
+// Tests write notification code.
+func TestWriteNotification(t *testing.T) {
+	// Initialize a new test config.
+	root, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("Unable to initialize test config %s", err)
+	}
+	defer removeAll(root)
+
+	var buffer bytes.Buffer
+	// Collection of test cases for each event writer.
+	testCases := []struct {
+		writer *flushWriter
+		event  map[string][]NotificationEvent
+		err    error
+	}{
+		// Invalid input argument with writer `nil` - Test - 1
+		{
+			writer: nil,
+			event:  nil,
+			err:    errInvalidArgument,
+		},
+		// Invalid input argument with event `nil` - Test - 2
+		{
+			writer: newFlushWriter(ioutil.Discard),
+			event:  nil,
+			err:    errInvalidArgument,
+		},
+		// Unmarshal and write, validate last 5 bytes. - Test - 3
+		{
+			writer: newFlushWriter(&buffer),
+			event: map[string][]NotificationEvent{
+				"Records": {newNotificationEvent(eventData{
+					Type:   ObjectCreatedPut,
+					Bucket: "testbucket",
+					ObjInfo: ObjectInfo{
+						Name: "key",
+					},
+					ReqParams: map[string]string{
+						"ip": "10.1.10.1",
+					}}),
+				},
+			},
+			err: nil,
+		},
+	}
+	// Validates all the testcases for writing notification.
+	for _, testCase := range testCases {
+		err := writeNotification(testCase.writer, testCase.event)
+		if err != testCase.err {
+			t.Errorf("Unable to write notification %s", err)
+		}
+		// Validates if the ending string has 'crlf'
+		if err == nil && !bytes.HasSuffix(buffer.Bytes(), crlf) {
+			buf := buffer.Bytes()[buffer.Len()-5 : 0]
+			t.Errorf("Invalid suffix found from the writer last 5 bytes %s, expected `\r\n`", string(buf))
+		}
+		// Not printing 'buf' on purpose, validates look for string '10.1.10.1'.
+		if err == nil && !bytes.Contains(buffer.Bytes(), []byte("10.1.10.1")) {
+			// Enable when debugging)
+			// fmt.Println(string(buffer.Bytes()))
+			t.Errorf("Requested content couldn't be found, expected `10.1.10.1`")
+		}
+	}
+}

cmd/bucket-notification-utils.go

@@ -0,0 +1,373 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "strings"
+
+// List of valid event types.
+var suppportedEventTypes = map[string]struct{}{
+	// Object created event types.
+	"s3:ObjectCreated:*":                       {},
+	"s3:ObjectCreated:Put":                     {},
+	"s3:ObjectCreated:Post":                    {},
+	"s3:ObjectCreated:Copy":                    {},
+	"s3:ObjectCreated:CompleteMultipartUpload": {},
+	// Object removed event types.
+	"s3:ObjectRemoved:*":      {},
+	"s3:ObjectRemoved:Delete": {},
+}
+
+// checkEvent - checks if an event is supported.
+func checkEvent(event string) APIErrorCode {
+	_, ok := suppportedEventTypes[event]
+	if !ok {
+		return ErrEventNotification
+	}
+	return ErrNone
+}
+
+// checkEvents - checks given list of events if all of them are valid.
+// given if one of them is invalid, this function returns an error.
+func checkEvents(events []string) APIErrorCode {
+	for _, event := range events {
+		if s3Error := checkEvent(event); s3Error != ErrNone {
+			return s3Error
+		}
+	}
+	return ErrNone
+}
+
+// Valid if filterName is 'prefix'.
+func isValidFilterNamePrefix(filterName string) bool {
+	return "prefix" == filterName
+}
+
+// Valid if filterName is 'suffix'.
+func isValidFilterNameSuffix(filterName string) bool {
+	return "suffix" == filterName
+}
+
+// Is this a valid filterName? - returns true if valid.
+func isValidFilterName(filterName string) bool {
+	return isValidFilterNamePrefix(filterName) || isValidFilterNameSuffix(filterName)
+}
+
+// checkFilterRules - checks given list of filter rules if all of them are valid.
+func checkFilterRules(filterRules []filterRule) APIErrorCode {
+	ruleSetMap := make(map[string]string)
+	// Validate all filter rules.
+	for _, filterRule := range filterRules {
+		// Unknown filter rule name found, returns an appropriate error.
+		if !isValidFilterName(filterRule.Name) {
+			return ErrFilterNameInvalid
+		}
+
+		// Filter names should not be set twice per notification service
+		// configuration, if found return an appropriate error.
+		if _, ok := ruleSetMap[filterRule.Name]; ok {
+			if isValidFilterNamePrefix(filterRule.Name) {
+				return ErrFilterNamePrefix
+			} else if isValidFilterNameSuffix(filterRule.Name) {
+				return ErrFilterNameSuffix
+			} else {
+				return ErrFilterNameInvalid
+			}
+		}
+
+		if !IsValidObjectPrefix(filterRule.Value) {
+			return ErrFilterValueInvalid
+		}
+
+		// Set the new rule name to keep track of duplicates.
+		ruleSetMap[filterRule.Name] = filterRule.Value
+	}
+	// Success all prefixes validated.
+	return ErrNone
+}
+
+// Checks validity of input ARN for a given arnType.
+func checkARN(arn, arnType string) APIErrorCode {
+	if !strings.HasPrefix(arn, arnType) {
+		return ErrARNNotification
+	}
+	if !strings.HasPrefix(arn, arnType+serverConfig.GetRegion()+":") {
+		return ErrRegionNotification
+	}
+	account := strings.SplitN(strings.TrimPrefix(arn, arnType+serverConfig.GetRegion()+":"), ":", 2)
+	switch len(account) {
+	case 1:
+		// This means ARN is malformed, account should have min of 2elements.
+		return ErrARNNotification
+	case 2:
+		// Account topic id or topic name cannot be empty.
+		if account[0] == "" || account[1] == "" {
+			return ErrARNNotification
+		}
+	}
+	return ErrNone
+}
+
+// checkQueueARN - check if the queue arn is valid.
+func checkQueueARN(queueARN string) APIErrorCode {
+	return checkARN(queueARN, minioSqs)
+}
+
+// checkTopicARN - check if the topic arn is valid.
+func checkTopicARN(topicARN string) APIErrorCode {
+	return checkARN(topicARN, minioTopic)
+}
+
+// Returns true if the topicARN is for an Minio sns listen type.
+func isMinioSNS(topicARN arnTopic) bool {
+	return strings.HasSuffix(topicARN.Type, snsTypeMinio)
+}
+
+// isMinioSNSConfigured - verifies if one topic ARN is valid and is enabled.
+func isMinioSNSConfigured(topicARN string, topicConfigs []topicConfig) bool {
+	for _, topicConfig := range topicConfigs {
+		// Validate if topic ARN is already enabled.
+		if topicARN == topicConfig.TopicARN {
+			return true
+		}
+	}
+	return false
+}
+
+// Validate if we recognize the queue type.
+func isValidQueue(sqsARN arnSQS) bool {
+	amqpQ := isAMQPQueue(sqsARN)       // Is amqp queue?.
+	elasticQ := isElasticQueue(sqsARN) // Is elastic queue?.
+	redisQ := isRedisQueue(sqsARN)     // Is redis queue?.
+	return amqpQ || elasticQ || redisQ
+}
+
+// Validate if we recognize the topic type.
+func isValidTopic(topicARN arnTopic) bool {
+	return isMinioSNS(topicARN) // Is minio topic?.
+}
+
+// Validates account id for input queue ARN.
+func isValidQueueID(queueARN string) bool {
+	// Unmarshals QueueARN into structured object.
+	sqsARN := unmarshalSqsARN(queueARN)
+	// AMQP queue.
+	if isAMQPQueue(sqsARN) {
+		amqpN := serverConfig.GetAMQPNotifyByID(sqsARN.AccountID)
+		return amqpN.Enable && amqpN.URL != ""
+	} else if isElasticQueue(sqsARN) { // Elastic queue.
+		elasticN := serverConfig.GetElasticSearchNotifyByID(sqsARN.AccountID)
+		return elasticN.Enable && elasticN.URL != ""
+
+	} else if isRedisQueue(sqsARN) { // Redis queue.
+		redisN := serverConfig.GetRedisNotifyByID(sqsARN.AccountID)
+		return redisN.Enable && redisN.Addr != ""
+	}
+	return false
+}
+
+// Check - validates queue configuration and returns error if any.
+func checkQueueConfig(qConfig queueConfig) APIErrorCode {
+	// Check queue arn is valid.
+	if s3Error := checkQueueARN(qConfig.QueueARN); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Unmarshals QueueARN into structured object.
+	sqsARN := unmarshalSqsARN(qConfig.QueueARN)
+	// Validate if sqsARN requested any of the known supported queues.
+	if !isValidQueue(sqsARN) {
+		return ErrARNNotification
+	}
+
+	// Validate if the account ID is correct.
+	if !isValidQueueID(qConfig.QueueARN) {
+		return ErrARNNotification
+	}
+
+	// Check if valid events are set in queue config.
+	if s3Error := checkEvents(qConfig.Events); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Check if valid filters are set in queue config.
+	if s3Error := checkFilterRules(qConfig.Filter.Key.FilterRules); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Success.
+	return ErrNone
+}
+
+// Check - validates queue configuration and returns error if any.
+func checkTopicConfig(tConfig topicConfig) APIErrorCode {
+	// Check queue arn is valid.
+	if s3Error := checkTopicARN(tConfig.TopicARN); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Unmarshals QueueARN into structured object.
+	topicARN := unmarshalTopicARN(tConfig.TopicARN)
+	// Validate if topicARN requested any of the known supported queues.
+	if !isValidTopic(topicARN) {
+		return ErrARNNotification
+	}
+
+	// Check if valid events are set in queue config.
+	if s3Error := checkEvents(tConfig.Events); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Check if valid filters are set in queue config.
+	if s3Error := checkFilterRules(tConfig.Filter.Key.FilterRules); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Success.
+	return ErrNone
+}
+
+// Validates all incoming queue configs, checkQueueConfig validates if the
+// input fields for each queues is not malformed and has valid configuration
+// information.  If validation fails bucket notifications are not enabled.
+func validateQueueConfigs(queueConfigs []queueConfig) APIErrorCode {
+	for _, qConfig := range queueConfigs {
+		if s3Error := checkQueueConfig(qConfig); s3Error != ErrNone {
+			return s3Error
+		}
+	}
+	// Success.
+	return ErrNone
+}
+
+// Validates all incoming topic configs, checkTopicConfig validates if the
+// input fields for each queues is not malformed and has valid configuration
+// information.  If validation fails bucket notifications are not enabled.
+func validateTopicConfigs(topicConfigs []topicConfig) APIErrorCode {
+	for _, tConfig := range topicConfigs {
+		if s3Error := checkTopicConfig(tConfig); s3Error != ErrNone {
+			return s3Error
+		}
+	}
+	// Success.
+	return ErrNone
+}
+
+// Check all the queue configs for any duplicates.
+func checkDuplicateQueueConfigs(configs []queueConfig) APIErrorCode {
+	configMaps := make(map[string]int)
+
+	// Navigate through each configs and count the entries.
+	for _, config := range configs {
+		configMaps[config.QueueARN]++
+	}
+
+	// Validate if there are any duplicate counts.
+	for _, count := range configMaps {
+		if count != 1 {
+			return ErrOverlappingConfigs
+		}
+	}
+
+	// Success.
+	return ErrNone
+}
+
+// Check all the topic configs for any duplicates.
+func checkDuplicateTopicConfigs(configs []topicConfig) APIErrorCode {
+	configMaps := make(map[string]int)
+
+	// Navigate through each configs and count the entries.
+	for _, config := range configs {
+		configMaps[config.TopicARN]++
+	}
+
+	// Validate if there are any duplicate counts.
+	for _, count := range configMaps {
+		if count != 1 {
+			return ErrOverlappingConfigs
+		}
+	}
+
+	// Success.
+	return ErrNone
+}
+
+// Validates all the bucket notification configuration for their validity,
+// if one of the config is malformed or has invalid data it is rejected.
+// Configuration is never applied partially.
+func validateNotificationConfig(nConfig notificationConfig) APIErrorCode {
+	// Validate all queue configs.
+	if s3Error := validateQueueConfigs(nConfig.QueueConfigs); s3Error != ErrNone {
+		return s3Error
+	}
+	// Validate all topic configs.
+	if s3Error := validateTopicConfigs(nConfig.TopicConfigs); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Check for duplicate queue configs.
+	if s3Error := checkDuplicateQueueConfigs(nConfig.QueueConfigs); s3Error != ErrNone {
+		return s3Error
+	}
+	// Check for duplicate topic configs.
+	if s3Error := checkDuplicateTopicConfigs(nConfig.TopicConfigs); s3Error != ErrNone {
+		return s3Error
+	}
+
+	// Add validation for other configurations.
+	return ErrNone
+}
+
+// Unmarshals input value of AWS ARN format into minioTopic object.
+// Returned value represents minio topic type, currently supported are
+// - listen
+func unmarshalTopicARN(topicARN string) arnTopic {
+	topic := arnTopic{}
+	if !strings.HasPrefix(topicARN, minioTopic+serverConfig.GetRegion()+":") {
+		return topic
+	}
+	topicType := strings.TrimPrefix(topicARN, minioTopic+serverConfig.GetRegion()+":")
+	switch {
+	case strings.HasSuffix(topicType, snsTypeMinio):
+		topic.Type = snsTypeMinio
+	} // Add more topic here.
+	topic.AccountID = strings.TrimSuffix(topicType, ":"+topic.Type)
+	return topic
+}
+
+// Unmarshals input value of AWS ARN format into minioSqs object.
+// Returned value represents minio sqs types, currently supported are
+// - amqp
+// - elasticsearch
+// - redis
+func unmarshalSqsARN(queueARN string) (mSqs arnSQS) {
+	mSqs = arnSQS{}
+	if !strings.HasPrefix(queueARN, minioSqs+serverConfig.GetRegion()+":") {
+		return mSqs
+	}
+	sqsType := strings.TrimPrefix(queueARN, minioSqs+serverConfig.GetRegion()+":")
+	switch {
+	case strings.HasSuffix(sqsType, queueTypeAMQP):
+		mSqs.Type = queueTypeAMQP
+	case strings.HasSuffix(sqsType, queueTypeElastic):
+		mSqs.Type = queueTypeElastic
+	case strings.HasSuffix(sqsType, queueTypeRedis):
+		mSqs.Type = queueTypeRedis
+	} // Add more queues here.
+	mSqs.AccountID = strings.TrimSuffix(sqsType, ":"+mSqs.Type)
+	return mSqs
+}

cmd/bucket-notification-utils_test.go

@@ -0,0 +1,354 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "testing"
+
+// Tests filter name validation.
+func TestIsValidFilterName(t *testing.T) {
+	testCases := []struct {
+		filterName string
+		status     bool
+	}{
+		// Validate if 'prefix' is correct.
+		{
+			filterName: "prefix",
+			status:     true,
+		},
+		// Validate if 'suffix' is correct.
+		{
+			filterName: "suffix",
+			status:     true,
+		},
+		// Invalid filter name empty string should return false.
+		{
+			filterName: "",
+			status:     false,
+		},
+		// Invalid filter name random character should return false.
+		{
+			filterName: "unknown",
+			status:     false,
+		},
+	}
+
+	for i, testCase := range testCases {
+		status := isValidFilterName(testCase.filterName)
+		if testCase.status != status {
+			t.Errorf("Test %d: Expected \"%t\", got \"%t\"", i+1, testCase.status, status)
+		}
+	}
+}
+
+// Tests list of valid and invalid events.
+func TestValidEvents(t *testing.T) {
+	testCases := []struct {
+		events  []string
+		errCode APIErrorCode
+	}{
+		// Return error for unknown event element.
+		{
+			events: []string{
+				"s3:UnknownAPI",
+			},
+			errCode: ErrEventNotification,
+		},
+		// Return success for supported event.
+		{
+			events: []string{
+				"s3:ObjectCreated:Put",
+			},
+			errCode: ErrNone,
+		},
+		// Return success for supported events.
+		{
+			events: []string{
+				"s3:ObjectCreated:*",
+				"s3:ObjectRemoved:*",
+			},
+			errCode: ErrNone,
+		},
+		// Return error for empty event list.
+		{
+			events:  []string{""},
+			errCode: ErrEventNotification,
+		},
+	}
+
+	for i, testCase := range testCases {
+		errCode := checkEvents(testCase.events)
+		if testCase.errCode != errCode {
+			t.Errorf("Test %d: Expected \"%d\", got \"%d\"", i+1, testCase.errCode, errCode)
+		}
+	}
+}
+
+// Tests topic arn validation.
+func TestTopicARN(t *testing.T) {
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("unable initialize config file, %s", err)
+	}
+	defer removeAll(rootPath)
+
+	testCases := []struct {
+		topicARN string
+		errCode  APIErrorCode
+	}{
+		// Valid minio topic with '1' account id.
+		{
+			topicARN: "arn:minio:sns:us-east-1:1:minio",
+			errCode:  ErrNone,
+		},
+		// Valid minio topic with '10' account id.
+		{
+			topicARN: "arn:minio:sns:us-east-1:10:minio",
+			errCode:  ErrNone,
+		},
+		// Invalid empty topic  arn.
+		{
+			topicARN: "",
+			errCode:  ErrARNNotification,
+		},
+		// Invalid notification service type.
+		{
+			topicARN: "arn:minio:sqs:us-east-1:1:listen",
+			errCode:  ErrARNNotification,
+		},
+		// Invalid region 'us-west-1' in queue arn.
+		{
+			topicARN: "arn:minio:sns:us-west-1:1:listen",
+			errCode:  ErrRegionNotification,
+		},
+		// Empty topic account id is invalid.
+		{
+			topicARN: "arn:minio:sns:us-east-1::listen",
+			errCode:  ErrARNNotification,
+		},
+		// Empty topic account name is invalid.
+		{
+			topicARN: "arn:minio:sns:us-east-1:10:",
+			errCode:  ErrARNNotification,
+		},
+		// Empty topic account id and account name is invalid.
+		{
+			topicARN: "arn:minio:sns:us-east-1::",
+			errCode:  ErrARNNotification,
+		},
+		// Missing topic id and separator missing at the end in topic arn.
+		{
+			topicARN: "arn:minio:sns:us-east-1:listen",
+			errCode:  ErrARNNotification,
+		},
+		// Missing topic id and empty string at the end in topic arn.
+		{
+			topicARN: "arn:minio:sns:us-east-1:",
+			errCode:  ErrARNNotification,
+		},
+	}
+
+	// Validate all topics.
+	for i, testCase := range testCases {
+		errCode := checkTopicARN(testCase.topicARN)
+		if testCase.errCode != errCode {
+			t.Errorf("Test %d: Expected \"%d\", got \"%d\"", i+1, testCase.errCode, errCode)
+		}
+	}
+}
+
+// Tests queue arn validation.
+func TestQueueARN(t *testing.T) {
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("unable initialize config file, %s", err)
+	}
+	defer removeAll(rootPath)
+
+	testCases := []struct {
+		queueARN string
+		errCode  APIErrorCode
+	}{
+		// Valid redis queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:redis",
+			errCode:  ErrNone,
+		},
+		// Valid elasticsearch queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:elasticsearch",
+			errCode:  ErrNone,
+		},
+		// Valid amqp queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:amqp",
+			errCode:  ErrNone,
+		},
+		// Invalid empty queue arn.
+		{
+			queueARN: "",
+			errCode:  ErrARNNotification,
+		},
+		// Invalid notification service type.
+		{
+			queueARN: "arn:minio:sns:us-east-1:1:listen",
+			errCode:  ErrARNNotification,
+		},
+		// Invalid region 'us-west-1' in queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-west-1:1:redis",
+			errCode:  ErrRegionNotification,
+		},
+		// Invalid queue name empty in queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:",
+			errCode:  ErrARNNotification,
+		},
+		// Invalid queue id empty in queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1::redis",
+			errCode:  ErrARNNotification,
+		},
+		// Invalid queue id and queue name empty in queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1::",
+			errCode:  ErrARNNotification,
+		},
+		// Missing queue id and separator missing at the end in queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:amqp",
+			errCode:  ErrARNNotification,
+		},
+		// Missing queue id and empty string at the end in queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:",
+			errCode:  ErrARNNotification,
+		},
+	}
+
+	// Validate all tests for queue arn.
+	for i, testCase := range testCases {
+		errCode := checkQueueARN(testCase.queueARN)
+		if testCase.errCode != errCode {
+			t.Errorf("Test %d: Expected \"%d\", got \"%d\"", i+1, testCase.errCode, errCode)
+		}
+	}
+}
+
+// Test unmarshal topic arn.
+func TestUnmarshalTopicARN(t *testing.T) {
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("unable initialize config file, %s", err)
+	}
+	defer removeAll(rootPath)
+
+	testCases := []struct {
+		topicARN string
+		Type     string
+	}{
+		// Valid minio topic arn.
+		{
+			topicARN: "arn:minio:sns:us-east-1:1:listen",
+			Type:     "listen",
+		},
+		// Invalid empty topic arn.
+		{
+			topicARN: "",
+			Type:     "",
+		},
+		// Invalid region 'us-west-1' in topic arn.
+		{
+			topicARN: "arn:minio:sns:us-west-1:1:listen",
+			Type:     "",
+		},
+		// Partial topic arn.
+		{
+			topicARN: "arn:minio:sns:",
+			Type:     "",
+		},
+		// Invalid topic service value.
+		{
+			topicARN: "arn:minio:sns:us-east-1:1:*",
+			Type:     "",
+		},
+	}
+
+	for i, testCase := range testCases {
+		topic := unmarshalTopicARN(testCase.topicARN)
+		if testCase.Type != topic.Type {
+			t.Errorf("Test %d: Expected \"%s\", got \"%s\"", i+1, testCase.Type, topic.Type)
+		}
+	}
+}
+
+// Test unmarshal queue arn.
+func TestUnmarshalSqsARN(t *testing.T) {
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("unable initialize config file, %s", err)
+	}
+	defer removeAll(rootPath)
+
+	testCases := []struct {
+		queueARN string
+		Type     string
+	}{
+		// Valid redis queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:redis",
+			Type:     "redis",
+		},
+		// Valid elasticsearch queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:elasticsearch",
+			Type:     "elasticsearch",
+		},
+		// Valid amqp queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:amqp",
+			Type:     "amqp",
+		},
+		// Invalid empty queue arn.
+		{
+			queueARN: "",
+			Type:     "",
+		},
+		// Invalid region 'us-west-1' in queue arn.
+		{
+			queueARN: "arn:minio:sqs:us-west-1:1:redis",
+			Type:     "",
+		},
+		// Partial queue arn.
+		{
+			queueARN: "arn:minio:sqs:",
+			Type:     "",
+		},
+		// Invalid queue service value.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:*",
+			Type:     "",
+		},
+	}
+
+	for i, testCase := range testCases {
+		mSqs := unmarshalSqsARN(testCase.queueARN)
+		if testCase.Type != mSqs.Type {
+			t.Errorf("Test %d: Expected \"%s\", got \"%s\"", i+1, testCase.Type, mSqs.Type)
+		}
+	}
+
+}

cmd/bucket-policy-handlers.go

@@ -14,25 +14,26 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"net/http"
-	"regexp"
-	"strings"
 
 	mux "github.com/gorilla/mux"
+	"github.com/minio/minio-go/pkg/set"
+	"github.com/minio/minio/pkg/wildcard"
 )
 
 // maximum supported access policy size.
-const maxAccessPolicySize = 20 * 1024 * 1024 // 20KiB.
+const maxAccessPolicySize = 20 * 1024 // 20KiB.
 
 // Verify if a given action is valid for the url path based on the
 // existing bucket access policy.
-func bucketPolicyEvalStatements(action string, resource string, conditions map[string]string, statements []policyStatement) bool {
+func bucketPolicyEvalStatements(action string, resource string, conditions map[string]set.StringSet, statements []policyStatement) bool {
 	for _, statement := range statements {
 		if bucketPolicyMatchStatement(action, resource, conditions, statement) {
 			if statement.Effect == "Allow" {
@@ -48,7 +49,7 @@ func bucketPolicyEvalStatements(action string, resource string, conditions map[s
 }
 
 // Verify if action, resource and conditions match input policy statement.
-func bucketPolicyMatchStatement(action string, resource string, conditions map[string]string, statement policyStatement) bool {
+func bucketPolicyMatchStatement(action string, resource string, conditions map[string]set.StringSet, statement policyStatement) bool {
 	// Verify if action matches.
 	if bucketPolicyActionMatch(action, statement) {
 		// Verify if resource matches.
@@ -64,60 +65,30 @@ func bucketPolicyMatchStatement(action string, resource string, conditions map[s
 
 // Verify if given action matches with policy statement.
 func bucketPolicyActionMatch(action string, statement policyStatement) bool {
-	for _, policyAction := range statement.Actions {
-		// Policy action can be a regex, validate the action with matching string.
-		matched, err := regexp.MatchString(policyAction, action)
-		fatalIf(err, "Invalid action \"%s\" in bucket policy.", action)
-		if matched {
-			return true
-		}
-	}
-	return false
+	return !statement.Actions.FuncMatch(actionMatch, action).IsEmpty()
 }
 
 // Match function matches wild cards in 'pattern' for resource.
 func resourceMatch(pattern, resource string) bool {
-	if pattern == "" {
-		return resource == pattern
-	}
-	if pattern == "*" {
-		return true
-	}
-	parts := strings.Split(pattern, "*")
-	if len(parts) == 1 {
-		return resource == pattern
-	}
-	tGlob := strings.HasSuffix(pattern, "*")
-	end := len(parts) - 1
-	if !strings.HasPrefix(resource, parts[0]) {
-		return false
-	}
-	for i := 1; i < end; i++ {
-		if !strings.Contains(resource, parts[i]) {
-			return false
-		}
-		idx := strings.Index(resource, parts[i]) + len(parts[i])
-		resource = resource[idx:]
-	}
-	return tGlob || strings.HasSuffix(resource, parts[end])
+	return wildcard.Match(pattern, resource)
+}
+
+// Match function matches wild cards in 'pattern' for action.
+func actionMatch(pattern, action string) bool {
+	return wildcard.MatchSimple(pattern, action)
 }
 
 // Verify if given resource matches with policy statement.
 func bucketPolicyResourceMatch(resource string, statement policyStatement) bool {
-	for _, resourcep := range statement.Resources {
-		// the resource rule for object could contain "*" wild card.
-		// the requested object can be given access based on the already set bucket policy if
-		// the match is successful.
-		// More info: http://docs.aws.amazon.com/AmazonS3/latest/dev/s3-arn-format.html .
-		if matched := resourceMatch(resourcep, resource); !matched {
-			return false
-		}
-	}
-	return true
+	// the resource rule for object could contain "*" wild card.
+	// the requested object can be given access based on the already set bucket policy if
+	// the match is successful.
+	// More info: http://docs.aws.amazon.com/AmazonS3/latest/dev/s3-arn-format.html.
+	return !statement.Resources.FuncMatch(resourceMatch, resource).IsEmpty()
 }
 
 // Verify if given condition matches with policy statement.
-func bucketPolicyConditionMatch(conditions map[string]string, statement policyStatement) bool {
+func bucketPolicyConditionMatch(conditions map[string]set.StringSet, statement policyStatement) bool {
 	// Supports following conditions.
 	// - StringEquals
 	// - StringNotEquals
@@ -126,22 +97,22 @@ func bucketPolicyConditionMatch(conditions map[string]string, statement policySt
 	// - s3:prefix
 	// - s3:max-keys
 	var conditionMatches = true
-	for condition, conditionKeys := range statement.Conditions {
+	for condition, conditionKeyVal := range statement.Conditions {
 		if condition == "StringEquals" {
-			if conditionKeys["s3:prefix"] != conditions["prefix"] {
+			if !conditionKeyVal["s3:prefix"].Equals(conditions["prefix"]) {
 				conditionMatches = false
 				break
 			}
-			if conditionKeys["s3:max-keys"] != conditions["max-keys"] {
+			if !conditionKeyVal["s3:max-keys"].Equals(conditions["max-keys"]) {
 				conditionMatches = false
 				break
 			}
 		} else if condition == "StringNotEquals" {
-			if conditionKeys["s3:prefix"] == conditions["prefix"] {
+			if !conditionKeyVal["s3:prefix"].Equals(conditions["prefix"]) {
 				conditionMatches = false
 				break
 			}
-			if conditionKeys["s3:max-keys"] == conditions["max-keys"] {
+			if !conditionKeyVal["s3:max-keys"].Equals(conditions["max-keys"]) {
 				conditionMatches = false
 				break
 			}
@@ -157,14 +128,13 @@ func bucketPolicyConditionMatch(conditions map[string]string, statement policySt
 func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
-
 	switch getRequestAuthType(r) {
 	default:
 		// For all unknown auth types return error.
 		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
 		return
 	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
+		if s3Error := isReqAuthenticated(r, serverConfig.GetRegion()); s3Error != ErrNone {
 			writeErrorResponse(w, r, s3Error, r.URL.Path)
 			return
 		}
@@ -188,15 +158,15 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 	// Read access policy up to maxAccessPolicySize.
 	// http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
 	// bucket policies are limited to 20KB in size, using a limit reader.
-	bucketPolicyBuf, err := ioutil.ReadAll(io.LimitReader(r.Body, maxAccessPolicySize))
+	policyBytes, err := ioutil.ReadAll(io.LimitReader(r.Body, maxAccessPolicySize))
 	if err != nil {
-		errorIf(err, "Unable to read bucket policy.")
-		writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
+		errorIf(err, "Unable to read from client.")
+		writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
 		return
 	}
-
 	// Parse bucket policy.
-	bucketPolicy, err := parseBucketPolicy(bucketPolicyBuf)
+	var policy = &bucketPolicy{}
+	err = parseBucketPolicy(bytes.NewReader(policyBytes), policy)
 	if err != nil {
 		errorIf(err, "Unable to parse bucket policy.")
 		writeErrorResponse(w, r, ErrInvalidPolicyDocument, r.URL.Path)
@@ -204,13 +174,13 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 	}
 
 	// Parse check bucket policy.
-	if s3Error := checkBucketPolicyResources(bucket, bucketPolicy); s3Error != ErrNone {
+	if s3Error := checkBucketPolicyResources(bucket, policy); s3Error != ErrNone {
 		writeErrorResponse(w, r, s3Error, r.URL.Path)
 		return
 	}
 
 	// Save bucket policy.
-	if err := writeBucketPolicy(bucket, bucketPolicyBuf); err != nil {
+	if err = writeBucketPolicy(bucket, api.ObjectAPI, bytes.NewReader(policyBytes), int64(len(policyBytes))); err != nil {
 		errorIf(err, "Unable to write bucket policy.")
 		switch err.(type) {
 		case BucketNameInvalid:
@@ -220,6 +190,11 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 		}
 		return
 	}
+
+	// Set the bucket policy in memory.
+	globalBucketPolicies.SetBucketPolicy(bucket, policy)
+
+	// Success.
 	writeSuccessNoContent(w)
 }
 
@@ -228,23 +203,17 @@ func (api objectAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *ht
 // This implementation of the DELETE operation uses the policy
 // subresource to add to remove a policy on a bucket.
 func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
+	// DeleteBucketPolicy does not support bucket policies, use checkAuth to validate signature.
+	if s3Error := checkAuth(r); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
 
-	switch getRequestAuthType(r) {
-	default:
-		// For all unknown auth types return error.
-		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
-		return
-	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
-			writeErrorResponse(w, r, s3Error, r.URL.Path)
-			return
-		}
-	}
-
 	// Delete bucket access policy.
-	if err := removeBucketPolicy(bucket); err != nil {
+	if err := removeBucketPolicy(bucket, api.ObjectAPI); err != nil {
 		errorIf(err, "Unable to remove bucket policy.")
 		switch err.(type) {
 		case BucketNameInvalid:
@@ -256,6 +225,11 @@ func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r
 		}
 		return
 	}
+
+	// Remove bucket policy.
+	globalBucketPolicies.RemoveBucketPolicy(bucket)
+
+	// Success.
 	writeSuccessNoContent(w)
 }
 
@@ -264,23 +238,17 @@ func (api objectAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r
 // This operation uses the policy
 // subresource to return the policy of a specified bucket.
 func (api objectAPIHandlers) GetBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
+	// GetBucketPolicy does not support bucket policies, use checkAuth to validate signature.
+	if s3Error := checkAuth(r); s3Error != ErrNone {
+		writeErrorResponse(w, r, s3Error, r.URL.Path)
+		return
+	}
+
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
 
-	switch getRequestAuthType(r) {
-	default:
-		// For all unknown auth types return error.
-		writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
-		return
-	case authTypePresigned, authTypeSigned:
-		if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
-			writeErrorResponse(w, r, s3Error, r.URL.Path)
-			return
-		}
-	}
-
 	// Read bucket access policy.
-	p, err := readBucketPolicy(bucket)
+	policy, err := readBucketPolicy(bucket, api.ObjectAPI)
 	if err != nil {
 		errorIf(err, "Unable to read bucket policy.")
 		switch err.(type) {
@@ -293,5 +261,7 @@ func (api objectAPIHandlers) GetBucketPolicyHandler(w http.ResponseWriter, r *ht
 		}
 		return
 	}
-	io.Copy(w, bytes.NewReader(p))
+
+	// Write to client.
+	fmt.Fprint(w, policy)
 }

cmd/bucket-policy-handlers_test.go

@@ -0,0 +1,549 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 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"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/minio/minio-go/pkg/set"
+)
+
+// Tests validate Bucket policy resource matcher.
+func TestBucketPolicyResourceMatch(t *testing.T) {
+
+	// generates statement with given resource..
+	generateStatement := func(resource string) policyStatement {
+		statement := policyStatement{}
+		statement.Resources = set.CreateStringSet([]string{resource}...)
+		return statement
+	}
+
+	// generates resource prefix.
+	generateResource := func(bucketName, objectName string) string {
+		return AWSResourcePrefix + bucketName + "/" + objectName
+	}
+
+	testCases := []struct {
+		resourceToMatch       string
+		statement             policyStatement
+		expectedResourceMatch bool
+	}{
+		// Test case 1-4.
+		// Policy with resource ending with bucket/* allows access to all objects inside the given bucket.
+		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
+		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
+		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
+		{generateResource("minio-bucket", ""), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/*")), true},
+		// Test case - 5.
+		// Policy with resource ending with bucket/oo* should not allow access to bucket/output.txt.
+		{generateResource("minio-bucket", "output.txt"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/oo*")), false},
+		// Test case - 6.
+		// Policy with resource ending with bucket/oo* should allow access to bucket/ootput.txt.
+		{generateResource("minio-bucket", "ootput.txt"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/oo*")), true},
+		// Test case - 7.
+		// Policy with resource ending with bucket/oo* allows access to all subfolders starting with "oo" inside given bucket.
+		{generateResource("minio-bucket", "oop-bucket/my-file"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/oo*")), true},
+		// Test case - 8.
+		{generateResource("minio-bucket", "Asia/India/1.pjg"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/Asia/Japan/*")), false},
+		// Test case - 9.
+		{generateResource("minio-bucket", "Asia/India/1.pjg"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix, "minio-bucket"+"/Asia/Japan/*")), false},
+		// Test case - 10.
+		// Proves that the name space is flat.
+		{generateResource("minio-bucket", "Africa/Bihar/India/design_info.doc/Bihar"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix,
+			"minio-bucket"+"/*/India/*/Bihar")), true},
+		// Test case - 11.
+		// Proves that the name space is flat.
+		{generateResource("minio-bucket", "Asia/China/India/States/Bihar/output.txt"), generateStatement(fmt.Sprintf("%s%s", AWSResourcePrefix,
+			"minio-bucket"+"/*/India/*/Bihar/*")), true},
+	}
+	for i, testCase := range testCases {
+		actualResourceMatch := bucketPolicyResourceMatch(testCase.resourceToMatch, testCase.statement)
+		if testCase.expectedResourceMatch != actualResourceMatch {
+			t.Errorf("Test %d: Expected Resource match to be `%v`, but instead found it to be `%v`", i+1, testCase.expectedResourceMatch, actualResourceMatch)
+		}
+	}
+}
+
+// TestBucketPolicyActionMatch - Test validates whether given action on the
+// bucket/object matches the allowed actions in policyStatement.
+// This test preserves the allowed actions for all 3 sets of policies, that is read-write,read-only, write-only.
+// The intention of the test is to catch any changes made to allowed action for on eof the above 3 major policy groups mentioned.
+func TestBucketPolicyActionMatch(t *testing.T) {
+	bucketName := getRandomBucketName()
+	objectPrefix := "test-object"
+
+	testCases := []struct {
+		action         string
+		statement      policyStatement
+		expectedResult bool
+	}{
+		// s3:GetBucketLocation is the action necessary to be present in the bucket policy to allow
+		// fetching of bucket location on an Anonymous/unsigned request.
+
+		//r ead-write bucket policy is expected to allow GetBucketLocation operation on an anonymous request (Test case - 1).
+		{"s3:GetBucketLocation", getReadWriteBucketStatement(bucketName, objectPrefix), true},
+		//	write-only bucket policy is expected to allow GetBucketLocation operation on an anonymous request (Test case - 2).
+		{"s3:GetBucketLocation", getWriteOnlyBucketStatement(bucketName, objectPrefix), true},
+		//	read-only bucket policy is expected to allow GetBucketLocation operation on an anonymous request (Test case - 3).
+		{"s3:GetBucketLocation", getReadOnlyBucketStatement(bucketName, objectPrefix), true},
+
+		// Any of the Object level access permissions shouldn't allow for GetBucketLocation operation  on an Anonymous/unsigned request (Test cases 4-6).
+		{"s3:GetBucketLocation", getReadWriteObjectStatement(bucketName, objectPrefix), false},
+		{"s3:GetBucketLocation", getWriteOnlyObjectStatement(bucketName, objectPrefix), false},
+		{"s3:GetBucketLocation", getReadOnlyObjectStatement(bucketName, objectPrefix), false},
+
+		// s3:ListBucketMultipartUploads is the action necessary to be present in the bucket policy to allow
+		// Listing of multipart uploads in a given bucket for an Anonymous/unsigned request.
+
+		//read-write bucket policy is expected to allow  ListBucketMultipartUploads operation on an anonymous request (Test case 7).
+		{"s3:ListBucketMultipartUploads", getReadWriteBucketStatement(bucketName, objectPrefix), true},
+		//	write-only bucket policy is expected to allow  ListBucketMultipartUploads operation on an anonymous request (Test case 8).
+		{"s3:ListBucketMultipartUploads", getWriteOnlyBucketStatement(bucketName, objectPrefix), true},
+		// read-only bucket policy is expected to not allow ListBucketMultipartUploads operation on an anonymous request (Test case 9).
+		// the allowed actions in read-only bucket statement are  "s3:GetBucketLocation","s3:ListBucket",
+		// this should not allow for ListBucketMultipartUploads operations.
+		{"s3:ListBucketMultipartUploads", getReadOnlyBucketStatement(bucketName, objectPrefix), false},
+
+		// Any of the object level policy will not allow for s3:ListBucketMultipartUploads (Test cases 10-12).
+		{"s3:ListBucketMultipartUploads", getReadWriteObjectStatement(bucketName, objectPrefix), false},
+		{"s3:ListBucketMultipartUploads", getWriteOnlyObjectStatement(bucketName, objectPrefix), false},
+		{"s3:ListBucketMultipartUploads", getReadOnlyObjectStatement(bucketName, objectPrefix), false},
+
+		// s3:ListBucket is the action necessary to be present in the bucket policy to allow
+		// listing of all objects inside a given bucket on an Anonymous/unsigned request.
+
+		// Cases for testing ListBucket access for different Bucket level access permissions.
+		// read-only bucket policy is expected to allow ListBucket operation on an anonymous request (Test case 13).
+		{"s3:ListBucket", getReadOnlyBucketStatement(bucketName, objectPrefix), true},
+		// read-write bucket policy is expected to allow ListBucket operation on an anonymous request (Test case 14).
+		{"s3:ListBucket", getReadWriteBucketStatement(bucketName, objectPrefix), true},
+		// write-only  bucket policy is expected to not allow ListBucket operation on an anonymous request (Test case 15).
+		// the allowed actions in write-only  bucket statement are "s3:GetBucketLocation",	"s3:ListBucketMultipartUploads",
+		// this should not allow for ListBucket operations.
+		{"s3:ListBucket", getWriteOnlyBucketStatement(bucketName, objectPrefix), false},
+
+		// Cases for testing ListBucket access for different Object level access permissions (Test cases 16-18).
+		// Any of the Object level access permissions shouldn't allow for ListBucket operation  on an Anonymous/unsigned request.
+		{"s3:ListBucket", getReadOnlyObjectStatement(bucketName, objectPrefix), false},
+		{"s3:ListBucket", getReadWriteObjectStatement(bucketName, objectPrefix), false},
+		{"s3:ListBucket", getWriteOnlyObjectStatement(bucketName, objectPrefix), false},
+
+		// s3:DeleteObject is the action necessary to be present in the bucket policy to allow
+		// deleting/removal of  objects inside a given bucket for an Anonymous/unsigned request.
+
+		// Cases for testing DeleteObject access for different Bucket level access permissions (Test cases 19-21).
+		// Any of the Bucket level access permissions shouldn't allow for DeleteObject operation  on an Anonymous/unsigned request.
+		{"s3:DeleteObject", getReadOnlyBucketStatement(bucketName, objectPrefix), false},
+		{"s3:DeleteObject", getReadWriteBucketStatement(bucketName, objectPrefix), false},
+		{"s3:DeleteObject", getWriteOnlyBucketStatement(bucketName, objectPrefix), false},
+
+		// Cases for testing DeleteObject access for different Object level access permissions (Test cases 22).
+		// read-only bucket policy is expected to not allow Delete Object operation on an anonymous request.
+		{"s3:DeleteObject", getReadOnlyObjectStatement(bucketName, objectPrefix), false},
+		// read-write bucket policy is expected to allow Delete Bucket operation on an anonymous request (Test cases 23).
+		{"s3:DeleteObject", getReadWriteObjectStatement(bucketName, objectPrefix), true},
+		// write-only  bucket policy is expected to allow Delete Object operation on an anonymous request (Test cases 24).
+		{"s3:DeleteObject", getWriteOnlyObjectStatement(bucketName, objectPrefix), true},
+
+		// s3:AbortMultipartUpload is the action necessary to be present in the bucket policy to allow
+		// cancelling or abortion of an already initiated multipart upload operation for an Anonymous/unsigned request.
+
+		// Cases for testing AbortMultipartUpload access for different Bucket level access permissions (Test cases 25-27).
+		// Any of the Bucket level access permissions shouldn't allow for AbortMultipartUpload operation on an Anonymous/unsigned request.
+		{"s3:AbortMultipartUpload", getReadOnlyBucketStatement(bucketName, objectPrefix), false},
+		{"s3:AbortMultipartUpload", getReadWriteBucketStatement(bucketName, objectPrefix), false},
+		{"s3:AbortMultipartUpload", getWriteOnlyBucketStatement(bucketName, objectPrefix), false},
+
+		// Cases for testing AbortMultipartUpload access for different Object level access permissions.
+		// read-only object policy is expected to not allow AbortMultipartUpload operation on an anonymous request (Test case 28).
+		{"s3:AbortMultipartUpload", getReadOnlyObjectStatement(bucketName, objectPrefix), false},
+		// read-write object policy is expected to allow AbortMultipartUpload operation on an anonymous request (Test case 29).
+		{"s3:AbortMultipartUpload", getReadWriteObjectStatement(bucketName, objectPrefix), true},
+		// write-only object policy is expected to allow AbortMultipartUpload operation on an anonymous request (Test case 30).
+		{"s3:AbortMultipartUpload", getWriteOnlyObjectStatement(bucketName, objectPrefix), true},
+
+		// s3:PutObject is the action necessary to be present in the bucket policy to allow
+		// uploading of an object for an Anonymous/unsigned request.
+
+		// Cases for testing PutObject access for different Bucket level access permissions (Test cases 31-33).
+		// Any of the Bucket level access permissions shouldn't allow for PutObject operation on an Anonymous/unsigned request.
+		{"s3:PutObject", getReadOnlyBucketStatement(bucketName, objectPrefix), false},
+		{"s3:PutObject", getReadWriteBucketStatement(bucketName, objectPrefix), false},
+		{"s3:PutObject", getWriteOnlyBucketStatement(bucketName, objectPrefix), false},
+
+		// Cases for testing PutObject access for different Object level access permissions.
+		// read-only object policy is expected to not allow PutObject operation on an anonymous request (Test case 34).
+		{"s3:PutObject", getReadOnlyObjectStatement(bucketName, objectPrefix), false},
+		// read-write object policy is expected to allow PutObject operation on an anonymous request (Test case 35).
+		{"s3:PutObject", getReadWriteObjectStatement(bucketName, objectPrefix), true},
+		// write-only  object policy is expected to allow PutObject operation on an anonymous request (Test case 36).
+		{"s3:PutObject", getWriteOnlyObjectStatement(bucketName, objectPrefix), true},
+
+		// s3:GetObject is the action necessary to be present in the bucket policy to allow
+		// downloading of an object for an Anonymous/unsigned request.
+
+		// Cases for testing GetObject access for different Bucket level access permissions (Test cases 37-39).
+		// Any of the Bucket level access permissions shouldn't allow for GetObject operation on an Anonymous/unsigned request.
+		{"s3:GetObject", getReadOnlyBucketStatement(bucketName, objectPrefix), false},
+		{"s3:GetObject", getReadWriteBucketStatement(bucketName, objectPrefix), false},
+		{"s3:GetObject", getWriteOnlyBucketStatement(bucketName, objectPrefix), false},
+
+		// Cases for testing GetObject access for different Object level access permissions.
+		// read-only bucket policy is expected to allow  downloading of an Object on an anonymous request (Test case 40).
+		{"s3:GetObject", getReadOnlyObjectStatement(bucketName, objectPrefix), true},
+		// read-write bucket policy is expected to allow  downloading of an Object on an anonymous request (Test case 41).
+		{"s3:GetObject", getReadWriteObjectStatement(bucketName, objectPrefix), true},
+		// write-only  bucket policy is expected to not allow  downloading of an Object on an anonymous request (Test case 42).
+		{"s3:GetObject", getWriteOnlyObjectStatement(bucketName, objectPrefix), false},
+
+		// s3:ListMultipartUploadParts is the action necessary to be present in the bucket policy to allow
+		// Listing of uploaded parts for an Anonymous/unsigned request.
+
+		// Any of the Bucket level access permissions shouldn't allow for ListMultipartUploadParts operation on an Anonymous/unsigned request.
+		// read-only bucket policy is expected to not allow ListMultipartUploadParts operation on an anonymous request (Test cases 43-45).
+		{"s3:ListMultipartUploadParts", getReadOnlyBucketStatement(bucketName, objectPrefix), false},
+		{"s3:ListMultipartUploadParts", getReadWriteBucketStatement(bucketName, objectPrefix), false},
+		{"s3:ListMultipartUploadParts", getWriteOnlyBucketStatement(bucketName, objectPrefix), false},
+
+		// read-only object policy is expected to not allow ListMultipartUploadParts operation on an anonymous request (Test case 46).
+		{"s3:ListMultipartUploadParts", getReadOnlyObjectStatement(bucketName, objectPrefix), false},
+		// read-write object policy is expected to allow ListMultipartUploadParts operation on an anonymous request (Test case 47).
+		{"s3:ListMultipartUploadParts", getReadWriteObjectStatement(bucketName, objectPrefix), true},
+		// write-only  object policy is expected to allow ListMultipartUploadParts operation on an anonymous request (Test case 48).
+		{"s3:ListMultipartUploadParts", getWriteOnlyObjectStatement(bucketName, objectPrefix), true},
+	}
+	for i, testCase := range testCases {
+		actualResult := bucketPolicyActionMatch(testCase.action, testCase.statement)
+		if testCase.expectedResult != actualResult {
+			t.Errorf("Test %d: Expected the result to be `%v`, but instead found it to be `%v`", i+1, testCase.expectedResult, actualResult)
+		}
+	}
+}
+
+// Wrapper for calling Put Bucket Policy HTTP handler tests for both XL multiple disks and single node setup.
+func TestPutBucketPolicyHandler(t *testing.T) {
+	ExecObjectLayerTest(t, testPutBucketPolicyHandler)
+}
+
+// testPutBucketPolicyHandler - Test for Bucket policy end point.
+// TODO: Add exhaustive cases with various combination of statement fields.
+func testPutBucketPolicyHandler(obj ObjectLayer, instanceType string, t TestErrHandler) {
+	initBucketPolicies(obj)
+
+	// get random bucket name.
+	bucketName := getRandomBucketName()
+	// Create bucket.
+	err := obj.MakeBucket(bucketName)
+	if err != nil {
+		// failed to create newbucket, abort.
+		t.Fatalf("%s : %s", instanceType, err)
+	}
+	// Register the API end points with XL/FS object layer.
+	apiRouter := initTestAPIEndPoints(obj, []string{"PutBucketPolicy"})
+	// initialize the server and obtain the credentials and root.
+	// credentials are necessary to sign the HTTP request.
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+	// remove the root folder after the test ends.
+	defer removeAll(rootPath)
+
+	credentials := serverConfig.GetCredential()
+
+	// template for constructing HTTP request body for PUT bucket policy.
+	bucketPolicyTemplate := `{"Version":"2012-10-17","Statement":[{"Sid":"","Effect":"Allow","Principal":{"AWS":["*"]},"Action":["s3:GetBucketLocation","s3:ListBucket"],"Resource":["arn:aws:s3:::%s"]},{"Sid":"","Effect":"Allow","Principal":{"AWS":["*"]},"Action":["s3:GetObject"],"Resource":["arn:aws:s3:::%s/this*"]}]}`
+
+	// test cases with sample input and expected output.
+	testCases := []struct {
+		bucketName string
+		accessKey  string
+		secretKey  string
+		// expected Response.
+		expectedRespStatus int
+	}{
+		{bucketName, credentials.AccessKeyID, credentials.SecretAccessKey, http.StatusNoContent},
+	}
+
+	// Iterating over the test cases, calling the function under test and asserting the response.
+	for i, testCase := range testCases {
+		// obtain the put bucket policy request body.
+		bucketPolicyStr := fmt.Sprintf(bucketPolicyTemplate, testCase.bucketName, testCase.bucketName)
+		// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
+		rec := httptest.NewRecorder()
+		// construct HTTP request for PUT bucket policy endpoint.
+		req, err := newTestSignedRequest("PUT", getPutPolicyURL("", testCase.bucketName),
+			int64(len(bucketPolicyStr)), bytes.NewReader([]byte(bucketPolicyStr)), testCase.accessKey, testCase.secretKey)
+		if err != nil {
+			t.Fatalf("Test %d: Failed to create HTTP request for PutBucketPolicyHandler: <ERROR> %v", i+1, err)
+		}
+		// Since `apiRouter` satisfies `http.Handler` it has a ServeHTTP to execute the logic ofthe handler.
+		// Call the ServeHTTP to execute the handler.
+		apiRouter.ServeHTTP(rec, req)
+		if rec.Code != testCase.expectedRespStatus {
+			t.Errorf("Test %d: Expected the response status to be `%d`, but instead found `%d`", i+1, testCase.expectedRespStatus, rec.Code)
+		}
+	}
+}
+
+// Wrapper for calling Get Bucket Policy HTTP handler tests for both XL multiple disks and single node setup.
+func TestGetBucketPolicyHandler(t *testing.T) {
+	ExecObjectLayerTest(t, testGetBucketPolicyHandler)
+}
+
+// testGetBucketPolicyHandler - Test for end point which fetches the access policy json of the given bucket.
+// TODO: Add exhaustive cases with various combination of statement fields.
+func testGetBucketPolicyHandler(obj ObjectLayer, instanceType string, t TestErrHandler) {
+	initBucketPolicies(obj)
+
+	// get random bucket name.
+	bucketName := getRandomBucketName()
+	// Create bucket.
+	err := obj.MakeBucket(bucketName)
+	if err != nil {
+		// failed to create newbucket, abort.
+		t.Fatalf("%s : %s", instanceType, err)
+	}
+	// Register the API end points with XL/FS object layer.
+	// Registering only the PutBucketPolicy and GetBucketPolicy handlers.
+	apiRouter := initTestAPIEndPoints(obj, []string{"PutBucketPolicy", "GetBucketPolicy"})
+	// initialize the server and obtain the credentials and root.
+	// credentials are necessary to sign the HTTP request.
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+	// remove the root folder after the test ends.
+	defer removeAll(rootPath)
+
+	credentials := serverConfig.GetCredential()
+
+	// template for constructing HTTP request body for PUT bucket policy.
+	bucketPolicyTemplate := `{"Version":"2012-10-17","Statement":[{"Action":["s3:GetBucketLocation","s3:ListBucket"],"Effect":"Allow","Principal":{"AWS":["*"]},"Resource":["arn:aws:s3:::%s"],"Sid":""},{"Action":["s3:GetObject"],"Effect":"Allow","Principal":{"AWS":["*"]},"Resource":["arn:aws:s3:::%s/this*"],"Sid":""}]}`
+
+	// Writing bucket policy before running test on GetBucketPolicy.
+	putTestPolicies := []struct {
+		bucketName string
+		accessKey  string
+		secretKey  string
+		// expected Response.
+		expectedRespStatus int
+	}{
+		{bucketName, credentials.AccessKeyID, credentials.SecretAccessKey, http.StatusNoContent},
+	}
+
+	// Iterating over the cases and writing the bucket policy.
+	// its required to write the policies first before running tests on GetBucketPolicy.
+	for i, testPolicy := range putTestPolicies {
+		// obtain the put bucket policy request body.
+		bucketPolicyStr := fmt.Sprintf(bucketPolicyTemplate, testPolicy.bucketName, testPolicy.bucketName)
+		// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
+		rec := httptest.NewRecorder()
+		// construct HTTP request for PUT bucket policy endpoint.
+		req, err := newTestSignedRequest("PUT", getPutPolicyURL("", testPolicy.bucketName),
+			int64(len(bucketPolicyStr)), bytes.NewReader([]byte(bucketPolicyStr)), testPolicy.accessKey, testPolicy.secretKey)
+		if err != nil {
+			t.Fatalf("Test %d: Failed to create HTTP request for PutBucketPolicyHandler: <ERROR> %v", i+1, err)
+		}
+		// Since `apiRouter` satisfies `http.Handler` it has a ServeHTTP to execute the logic ofthe handler.
+		// Call the ServeHTTP to execute the handler.
+		apiRouter.ServeHTTP(rec, req)
+		if rec.Code != testPolicy.expectedRespStatus {
+			t.Fatalf("Case %d: Expected the response status to be `%d`, but instead found `%d`", i+1, testPolicy.expectedRespStatus, rec.Code)
+		}
+	}
+
+	// test cases with inputs and expected result for GetBucketPolicyHandler.
+	testCases := []struct {
+		bucketName string
+		accessKey  string
+		secretKey  string
+		// expected output.
+		expectedBucketPolicy string
+		expectedRespStatus   int
+	}{
+		{bucketName, credentials.AccessKeyID, credentials.SecretAccessKey, bucketPolicyTemplate, http.StatusOK},
+	}
+	// Iterating over the cases, fetching the policy and validating the response.
+	for i, testCase := range testCases {
+		// expected bucket policy json string.
+		expectedBucketPolicyStr := fmt.Sprintf(testCase.expectedBucketPolicy, testCase.bucketName, testCase.bucketName)
+		// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
+		rec := httptest.NewRecorder()
+		// construct HTTP request for PUT bucket policy endpoint.
+		req, err := newTestSignedRequest("GET", getGetPolicyURL("", testCase.bucketName),
+			0, nil, testCase.accessKey, testCase.secretKey)
+
+		if err != nil {
+			t.Fatalf("Test %d: Failed to create HTTP request for GetBucketPolicyHandler: <ERROR> %v", i+1, err)
+		}
+		// Since `apiRouter` satisfies `http.Handler` it has a ServeHTTP to execute the logic of the handler.
+		// Call the ServeHTTP to execute the handler, GetBucketPolicyHandler handles the request.
+		apiRouter.ServeHTTP(rec, req)
+		// Assert the response code with the expected status.
+		if rec.Code != testCase.expectedRespStatus {
+			t.Fatalf("Case %d: Expected the response status to be `%d`, but instead found `%d`", i+1, testCase.expectedRespStatus, rec.Code)
+		}
+		// read the response body.
+		bucketPolicyReadBuf, err := ioutil.ReadAll(rec.Body)
+		if err != nil {
+			t.Fatalf("Test %d: %s: Failed parsing response body: <ERROR> %v", i+1, instanceType, err)
+		}
+		// Verify whether the bucket policy fetched is same as the one inserted.
+		if expectedBucketPolicyStr != string(bucketPolicyReadBuf) {
+			t.Errorf("Test %d: %s: Bucket policy differs from expected value.", i+1, instanceType)
+		}
+	}
+}
+
+// Wrapper for calling Delete Bucket Policy HTTP handler tests for both XL multiple disks and single node setup.
+func TestDeleteBucketPolicyHandler(t *testing.T) {
+	ExecObjectLayerTest(t, testDeleteBucketPolicyHandler)
+}
+
+// testDeleteBucketPolicyHandler - Test for Delete bucket policy end point.
+// TODO: Add exhaustive cases with various combination of statement fields.
+func testDeleteBucketPolicyHandler(obj ObjectLayer, instanceType string, t TestErrHandler) {
+	initBucketPolicies(obj)
+
+	// get random bucket name.
+	bucketName := getRandomBucketName()
+	// Create bucket.
+	err := obj.MakeBucket(bucketName)
+	if err != nil {
+		// failed to create newbucket, abort.
+		t.Fatalf("%s : %s", instanceType, err)
+	}
+
+	// Register the API end points with XL/FS object layer.
+	// Registering PutBucketPolicy and DeleteBucketPolicy handlers.
+	apiRouter := initTestAPIEndPoints(obj, []string{"PutBucketPolicy", "DeleteBucketPolicy"})
+
+	// initialize the server and obtain the credentials and root.
+	// credentials are necessary to sign the HTTP request.
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+	// remove the root folder after the test ends.
+	defer removeAll(rootPath)
+
+	credentials := serverConfig.GetCredential()
+
+	// template for constructing HTTP request body for PUT bucket policy.
+	bucketPolicyTemplate := `{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Action": [
+                "s3:GetBucketLocation",
+                "s3:ListBucket"
+            ],
+            "Effect": "Allow",
+            "Principal": {
+                "AWS": [
+                    "*"
+                ]
+            },
+            "Resource": [
+                "arn:aws:s3:::%s"
+            ]
+        },
+        {
+            "Action": [
+                "s3:GetObject"
+            ],
+            "Effect": "Allow",
+            "Principal": {
+                "AWS": [
+                    "*"
+                ]
+            },
+            "Resource": [
+                "arn:aws:s3:::%s/this*"
+            ]
+        }
+    ]
+}`
+
+	// Writing bucket policy before running test on DeleteBucketPolicy.
+	putTestPolicies := []struct {
+		bucketName string
+		accessKey  string
+		secretKey  string
+		// expected Response.
+		expectedRespStatus int
+	}{
+		{bucketName, credentials.AccessKeyID, credentials.SecretAccessKey, http.StatusNoContent},
+	}
+
+	// Iterating over the cases and writing the bucket policy.
+	// its required to write the policies first before running tests on GetBucketPolicy.
+	for i, testPolicy := range putTestPolicies {
+		// obtain the put bucket policy request body.
+		bucketPolicyStr := fmt.Sprintf(bucketPolicyTemplate, testPolicy.bucketName, testPolicy.bucketName)
+		// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
+		rec := httptest.NewRecorder()
+		// construct HTTP request for PUT bucket policy endpoint.
+		req, err := newTestSignedRequest("PUT", getPutPolicyURL("", testPolicy.bucketName),
+			int64(len(bucketPolicyStr)), bytes.NewReader([]byte(bucketPolicyStr)), testPolicy.accessKey, testPolicy.secretKey)
+		if err != nil {
+			t.Fatalf("Test %d: Failed to create HTTP request for PutBucketPolicyHandler: <ERROR> %v", i+1, err)
+		}
+		// Since `apiRouter` satisfies `http.Handler` it has a ServeHTTP to execute the logic of the handler.
+		// Call the ServeHTTP to execute the handler.
+		apiRouter.ServeHTTP(rec, req)
+		if rec.Code != testPolicy.expectedRespStatus {
+			t.Fatalf("Case %d: Expected the response status to be `%d`, but instead found `%d`", i+1, testPolicy.expectedRespStatus, rec.Code)
+		}
+	}
+	// testcases with input and expected output for DeleteBucketPolicyHandler.
+	testCases := []struct {
+		bucketName string
+		accessKey  string
+		secretKey  string
+		// expected Response.
+		expectedRespStatus int
+	}{
+		{bucketName, credentials.AccessKeyID, credentials.SecretAccessKey, http.StatusNoContent},
+	}
+	// Iterating over the cases and deleting the bucket policy and then asserting response.
+	for i, testCase := range testCases {
+		// initialize HTTP NewRecorder, this records any mutations to response writer inside the handler.
+		rec := httptest.NewRecorder()
+		// construct HTTP request for Delete bucket policy endpoint.
+		req, err := newTestSignedRequest("DELETE", getDeletePolicyURL("", testCase.bucketName),
+			0, nil, testCase.accessKey, testCase.secretKey)
+
+		if err != nil {
+			t.Fatalf("Test %d: Failed to create HTTP request for GetBucketPolicyHandler: <ERROR> %v", i+1, err)
+		}
+		// Since `apiRouter` satisfies `http.Handler` it has a ServeHTTP to execute the logic of the handler.
+		// Call the ServeHTTP to execute the handler, DeleteBucketPolicyHandler  handles the request.
+		apiRouter.ServeHTTP(rec, req)
+		// Assert the response code with the expected status.
+		if rec.Code != testCase.expectedRespStatus {
+			t.Fatalf("Case %d: Expected the response status to be `%d`, but instead found `%d`", i+1, testCase.expectedRespStatus, rec.Code)
+		}
+
+	}
+}

cmd/bucket-policy-migrate.go

@@ -0,0 +1,83 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const policyJSON = "policy.json"
+
+func getBucketFromPolicyPath(oldPolicyPath string) string {
+	bucketPrefix, _ := filepath.Split(oldPolicyPath)
+	_, bucketName := filepath.Split(strings.TrimSuffix(bucketPrefix, slashSeparator))
+	return bucketName
+}
+
+func cleanupOldBucketPolicyConfigs() error {
+	// Get old bucket policy config directory.
+	oldBucketsConfigDir, err := getOldBucketsConfigPath()
+	fatalIf(err, "Unable to fetch buckets config path to migrate bucket policy")
+
+	// Recursively remove configDir/buckets/ - old bucket policy config location.
+	// N B This is called only if all bucket policies were successfully migrated.
+	return os.RemoveAll(oldBucketsConfigDir)
+}
+
+func migrateBucketPolicyConfig(objAPI ObjectLayer) error {
+	// Get old bucket policy config directory.
+	oldBucketsConfigDir, err := getOldBucketsConfigPath()
+	fatalIf(err, "Unable to fetch buckets config path to migrate bucket policy")
+
+	// Check if config directory holding bucket policy exists before
+	// migration.
+	_, err = os.Stat(oldBucketsConfigDir)
+	if os.IsNotExist(err) {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+
+	// WalkFunc that migrates access-policy.json to
+	// .minio.sys/buckets/bucketName/policy.json on all disks.
+	migrateBucketPolicy := func(policyPath string, fileInfo os.FileInfo, err error) error {
+		// policyFile - e.g /configDir/sample-bucket/access-policy.json
+		if err != nil {
+			return err
+		}
+		// Skip entries that aren't bucket policy files.
+		if fileInfo.Name() != "access-policy.json" {
+			return nil
+		}
+		// Get bucketName from old policy file path.
+		bucketName := getBucketFromPolicyPath(policyPath)
+		// Read bucket policy config from old location.
+		policyBytes, err := ioutil.ReadFile(policyPath)
+		fatalIf(err, "Unable to read bucket policy to migrate bucket policy", policyPath)
+		newPolicyPath := retainSlash(bucketConfigPrefix) + retainSlash(bucketName) + policyJSON
+		// Erasure code the policy config to all the disks.
+		_, err = objAPI.PutObject(minioMetaBucket, newPolicyPath, int64(len(policyBytes)), bytes.NewReader(policyBytes), nil)
+		fatalIf(err, "Unable to write bucket policy during migration.", newPolicyPath)
+		return nil
+	}
+	return filepath.Walk(oldBucketsConfigDir, migrateBucketPolicy)
+}

cmd/bucket-policy-parser.go

@@ -14,17 +14,20 @@
  * limitations under the License.
  */
 
-// This file implements AWS Access Policy Language parser in
+// Package cmd This file implements AWS Access Policy Language parser in
 // accordance with http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
-package main
+package cmd
 
 import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"path"
 	"sort"
 	"strings"
+
+	"github.com/minio/minio-go/pkg/set"
 )
 
 const (
@@ -33,96 +36,88 @@ const (
 )
 
 // supportedActionMap - lists all the actions supported by minio.
-var supportedActionMap = map[string]struct{}{
-	"s3:GetObject":                  {},
-	"s3:ListBucket":                 {},
-	"s3:PutObject":                  {},
-	"s3:GetBucketLocation":          {},
-	"s3:DeleteObject":               {},
-	"s3:AbortMultipartUpload":       {},
-	"s3:ListBucketMultipartUploads": {},
-	"s3:ListMultipartUploadParts":   {},
-}
+var supportedActionMap = set.CreateStringSet("*", "*", "s3:*", "s3:GetObject",
+	"s3:ListBucket", "s3:PutObject", "s3:GetBucketLocation", "s3:DeleteObject",
+	"s3:AbortMultipartUpload", "s3:ListBucketMultipartUploads", "s3:ListMultipartUploadParts")
 
 // supported Conditions type.
-var supportedConditionsType = map[string]struct{}{
-	"StringEquals":    {},
-	"StringNotEquals": {},
-}
+var supportedConditionsType = set.CreateStringSet("StringEquals", "StringNotEquals")
 
 // Validate s3:prefix, s3:max-keys are present if not
 // supported keys for the conditions.
-var supportedConditionsKey = map[string]struct{}{
-	"s3:prefix":   {},
-	"s3:max-keys": {},
-}
+var supportedConditionsKey = set.CreateStringSet("s3:prefix", "s3:max-keys")
 
-// User - canonical users list.
+// supportedEffectMap - supported effects.
+var supportedEffectMap = set.CreateStringSet("Allow", "Deny")
+
+// policyUser - canonical users list.
 type policyUser struct {
-	AWS []string
+	AWS           set.StringSet `json:"AWS,omitempty"`
+	CanonicalUser set.StringSet `json:"CanonicalUser,omitempty"`
 }
 
 // Statement - minio policy statement
 type policyStatement struct {
-	Sid        string
+	Actions    set.StringSet                       `json:"Action"`
+	Conditions map[string]map[string]set.StringSet `json:"Condition,omitempty"`
 	Effect     string
-	Principal  policyUser                   `json:"Principal"`
-	Actions    []string                     `json:"Action"`
-	Resources  []string                     `json:"Resource"`
-	Conditions map[string]map[string]string `json:"Condition"`
+	Principal  policyUser    `json:"Principal"`
+	Resources  set.StringSet `json:"Resource"`
+	Sid        string
 }
 
-// BucketPolicy - minio policy collection
-type BucketPolicy struct {
-	Version    string            // date in 0000-00-00 format
+// bucketPolicy - collection of various bucket policy statements.
+type bucketPolicy struct {
+	Version    string            // date in YYYY-MM-DD format
 	Statements []policyStatement `json:"Statement"`
 }
 
-// supportedEffectMap - supported effects.
-var supportedEffectMap = map[string]struct{}{
-	"Allow": {},
-	"Deny":  {},
+// Stringer implementation for the bucket policies.
+func (b bucketPolicy) String() string {
+	bbytes, err := json.Marshal(&b)
+	if err != nil {
+		errorIf(err, "Unable to unmarshal bucket policy into JSON %#v", b)
+		return ""
+	}
+	return string(bbytes)
 }
 
 // isValidActions - are actions valid.
-func isValidActions(actions []string) (err error) {
+func isValidActions(actions set.StringSet) (err error) {
 	// Statement actions cannot be empty.
 	if len(actions) == 0 {
 		err = errors.New("Action list cannot be empty.")
 		return err
 	}
-	for _, action := range actions {
-		if _, ok := supportedActionMap[action]; !ok {
-			err = errors.New("Unsupported action found: ‘" + action + "’, please validate your policy document.")
-			return err
-		}
+	if unsupportedActions := actions.Difference(supportedActionMap); !unsupportedActions.IsEmpty() {
+		err = fmt.Errorf("Unsupported actions found: ‘%#v’, please validate your policy document.", unsupportedActions)
+		return err
 	}
 	return nil
 }
 
 // isValidEffect - is effect valid.
-func isValidEffect(effect string) error {
+func isValidEffect(effect string) (err error) {
 	// Statement effect cannot be empty.
-	if len(effect) == 0 {
-		err := errors.New("Policy effect cannot be empty.")
+	if effect == "" {
+		err = errors.New("Policy effect cannot be empty.")
 		return err
 	}
-	_, ok := supportedEffectMap[effect]
-	if !ok {
-		err := errors.New("Unsupported Effect found: ‘" + effect + "’, please validate your policy document.")
+	if !supportedEffectMap.Contains(effect) {
+		err = errors.New("Unsupported Effect found: ‘" + effect + "’, please validate your policy document.")
 		return err
 	}
 	return nil
 }
 
 // isValidResources - are valid resources.
-func isValidResources(resources []string) (err error) {
+func isValidResources(resources set.StringSet) (err error) {
 	// Statement resources cannot be empty.
 	if len(resources) == 0 {
 		err = errors.New("Resource list cannot be empty.")
 		return err
 	}
-	for _, resource := range resources {
+	for resource := range resources {
 		if !strings.HasPrefix(resource, AWSResourcePrefix) {
 			err = errors.New("Unsupported resource style found: ‘" + resource + "’, please validate your policy document.")
 			return err
@@ -137,63 +132,50 @@ func isValidResources(resources []string) (err error) {
 }
 
 // isValidPrincipals - are valid principals.
-func isValidPrincipals(principals []string) (err error) {
+func isValidPrincipals(principals set.StringSet) (err error) {
 	// Statement principal should have a value.
 	if len(principals) == 0 {
 		err = errors.New("Principal cannot be empty.")
 		return err
 	}
-	for _, principal := range principals {
+	if unsuppPrincipals := principals.Difference(set.CreateStringSet([]string{"*"}...)); !unsuppPrincipals.IsEmpty() {
 		// Minio does not support or implement IAM, "*" is the only valid value.
 		// Amazon s3 doc on principals: http://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements.html#Principal
-		if principal != "*" {
-			err = fmt.Errorf("Unsupported principal style found: ‘%s’, please validate your policy document.", principal)
-			return err
-		}
+		err = fmt.Errorf("Unsupported principals found: ‘%#v’, please validate your policy document.", unsuppPrincipals)
+		return err
 	}
 	return nil
 }
 
 // isValidConditions - are valid conditions.
-func isValidConditions(conditions map[string]map[string]string) (err error) {
-	// Returns true if string 'a' is found in the list.
-	findString := func(a string, list []string) bool {
-		for _, b := range list {
-			if b == a {
-				return true
-			}
-		}
-		return false
-	}
-	conditionKeyVal := make(map[string][]string)
+func isValidConditions(conditions map[string]map[string]set.StringSet) (err error) {
 	// Verify conditions should be valid.
 	// Validate if stringEquals, stringNotEquals are present
 	// if not throw an error.
+	conditionKeyVal := make(map[string]set.StringSet)
 	for conditionType := range conditions {
-		_, validType := supportedConditionsType[conditionType]
-		if !validType {
+		if !supportedConditionsType.Contains(conditionType) {
 			err = fmt.Errorf("Unsupported condition type '%s', please validate your policy document.", conditionType)
 			return err
 		}
-		for key := range conditions[conditionType] {
-			_, validKey := supportedConditionsKey[key]
-			if !validKey {
+		for key, value := range conditions[conditionType] {
+			if !supportedConditionsKey.Contains(key) {
 				err = fmt.Errorf("Unsupported condition key '%s', please validate your policy document.", conditionType)
 				return err
 			}
-			conditionArray, ok := conditionKeyVal[key]
-			if ok && findString(conditions[conditionType][key], conditionArray) {
+			conditionVal, ok := conditionKeyVal[key]
+			if ok && !value.Intersection(conditionVal).IsEmpty() {
 				err = fmt.Errorf("Ambigious condition values for key '%s', please validate your policy document.", key)
 				return err
 			}
-			conditionKeyVal[key] = append(conditionKeyVal[key], conditions[conditionType][key])
+			conditionKeyVal[key] = value
 		}
 	}
 	return nil
 }
 
 // List of actions for which prefixes are not allowed.
-var invalidPrefixActions = map[string]struct{}{
+var invalidPrefixActions = set.StringSet{
 	"s3:GetBucketLocation":          {},
 	"s3:ListBucket":                 {},
 	"s3:ListBucketMultipartUploads": {},
@@ -211,13 +193,13 @@ func resourcePrefix(resource string) string {
 // checkBucketPolicyResources validates Resources in unmarshalled bucket policy structure.
 // First valation of Resources done for given set of Actions.
 // Later its validated for recursive Resources.
-func checkBucketPolicyResources(bucket string, bucketPolicy BucketPolicy) APIErrorCode {
+func checkBucketPolicyResources(bucket string, bucketPolicy *bucketPolicy) APIErrorCode {
 	// Validate statements for special actions and collect resources
 	// for others to validate nesting.
-	var resourceMap = make(map[string]struct{})
+	var resourceMap = set.NewStringSet()
 	for _, statement := range bucketPolicy.Statements {
-		for _, action := range statement.Actions {
-			for _, resource := range statement.Resources {
+		for action := range statement.Actions {
+			for resource := range statement.Resources {
 				resourcePrefix := strings.SplitAfter(resource, AWSResourcePrefix)[1]
 				if _, ok := invalidPrefixActions[action]; ok {
 					// Resource prefix is not equal to bucket for
@@ -232,7 +214,7 @@ func checkBucketPolicyResources(bucket string, bucketPolicy BucketPolicy) APIErr
 						return ErrMalformedPolicy
 					}
 					// All valid resources collect them separately to verify nesting.
-					resourceMap[resourcePrefix] = struct{}{}
+					resourceMap.Add(resourcePrefix)
 				}
 			}
 		}
@@ -255,7 +237,7 @@ func checkBucketPolicyResources(bucket string, bucketPolicy BucketPolicy) APIErr
 		for _, otherResource := range resources {
 			// Common prefix reject such rules.
 			if strings.HasPrefix(otherResource, resource) {
-				return ErrMalformedPolicy
+				return ErrPolicyNesting
 			}
 		}
 	}
@@ -266,44 +248,46 @@ func checkBucketPolicyResources(bucket string, bucketPolicy BucketPolicy) APIErr
 
 // parseBucketPolicy - parses and validates if bucket policy is of
 // proper JSON and follows allowed restrictions with policy standards.
-func parseBucketPolicy(bucketPolicyBuf []byte) (policy BucketPolicy, err error) {
-	if err = json.Unmarshal(bucketPolicyBuf, &policy); err != nil {
-		return BucketPolicy{}, err
+func parseBucketPolicy(bucketPolicyReader io.Reader, policy *bucketPolicy) (err error) {
+	// Parse bucket policy reader.
+	decoder := json.NewDecoder(bucketPolicyReader)
+	if err = decoder.Decode(&policy); err != nil {
+		return err
 	}
 
 	// Policy version cannot be empty.
 	if len(policy.Version) == 0 {
 		err = errors.New("Policy version cannot be empty.")
-		return BucketPolicy{}, err
+		return err
 	}
 
 	// Policy statements cannot be empty.
 	if len(policy.Statements) == 0 {
 		err = errors.New("Policy statement cannot be empty.")
-		return BucketPolicy{}, err
+		return err
 	}
 
 	// Loop through all policy statements and validate entries.
 	for _, statement := range policy.Statements {
 		// Statement effect should be valid.
 		if err := isValidEffect(statement.Effect); err != nil {
-			return BucketPolicy{}, err
+			return err
 		}
 		// Statement principal should be supported format.
 		if err := isValidPrincipals(statement.Principal.AWS); err != nil {
-			return BucketPolicy{}, err
+			return err
 		}
 		// Statement actions should be valid.
 		if err := isValidActions(statement.Actions); err != nil {
-			return BucketPolicy{}, err
+			return err
 		}
 		// Statement resources should be valid.
 		if err := isValidResources(statement.Resources); err != nil {
-			return BucketPolicy{}, err
+			return err
 		}
 		// Statement conditions should be valid.
 		if err := isValidConditions(statement.Conditions); err != nil {
-			return BucketPolicy{}, err
+			return err
 		}
 	}
 
@@ -324,5 +308,5 @@ func parseBucketPolicy(bucketPolicyBuf []byte) (policy BucketPolicy, err error)
 	policy.Statements = append(denyStatements, allowStatements...)
 
 	// Return successfully parsed policy structure.
-	return policy, nil
+	return nil
 }

cmd/bucket-policy-parser_test.go

@@ -13,16 +13,19 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package main
+package cmd
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"reflect"
 	"testing"
+
+	"github.com/minio/minio-go/pkg/set"
 )
 
+// Common bucket actions for both read and write policies.
 var (
 	readWriteBucketActions = []string{
 		"s3:GetBucketLocation",
@@ -69,60 +72,89 @@ var (
 	}
 )
 
-// Obtain statements for read-write BucketPolicy.
-func setReadWriteStatement(bucketName, objectPrefix string) []policyStatement {
-	bucketResourceStatement := policyStatement{}
+// Obtain bucket statement for read-write bucketPolicy.
+func getReadWriteObjectStatement(bucketName, objectPrefix string) policyStatement {
 	objectResourceStatement := policyStatement{}
-	statements := []policyStatement{}
-
-	bucketResourceStatement.Effect = "Allow"
-	bucketResourceStatement.Principal.AWS = []string{"*"}
-	bucketResourceStatement.Resources = []string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName)}
-	bucketResourceStatement.Actions = readWriteBucketActions
 	objectResourceStatement.Effect = "Allow"
-	objectResourceStatement.Principal.AWS = []string{"*"}
-	objectResourceStatement.Resources = []string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName+"/"+objectPrefix+"*")}
-	objectResourceStatement.Actions = readWriteObjectActions
+	objectResourceStatement.Principal.AWS = set.CreateStringSet([]string{"*"}...)
+	objectResourceStatement.Resources = set.CreateStringSet([]string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName+"/"+objectPrefix+"*")}...)
+	objectResourceStatement.Actions = set.CreateStringSet(readWriteObjectActions...)
+	return objectResourceStatement
+}
+
+// Obtain object statement for read-write bucketPolicy.
+func getReadWriteBucketStatement(bucketName, objectPrefix string) policyStatement {
+	bucketResourceStatement := policyStatement{}
+	bucketResourceStatement.Effect = "Allow"
+	bucketResourceStatement.Principal.AWS = set.CreateStringSet([]string{"*"}...)
+	bucketResourceStatement.Resources = set.CreateStringSet([]string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName)}...)
+	bucketResourceStatement.Actions = set.CreateStringSet(readWriteBucketActions...)
+	return bucketResourceStatement
+}
+
+// Obtain statements for read-write bucketPolicy.
+func getReadWriteStatement(bucketName, objectPrefix string) []policyStatement {
+	statements := []policyStatement{}
 	// Save the read write policy.
-	statements = append(statements, bucketResourceStatement, objectResourceStatement)
+	statements = append(statements, getReadWriteBucketStatement(bucketName, objectPrefix), getReadWriteObjectStatement(bucketName, objectPrefix))
 	return statements
 }
 
-// Obtain statements for read only BucketPolicy.
-func setReadOnlyStatement(bucketName, objectPrefix string) []policyStatement {
+// Obtain bucket statement for read only bucketPolicy.
+func getReadOnlyBucketStatement(bucketName, objectPrefix string) policyStatement {
 	bucketResourceStatement := policyStatement{}
-	objectResourceStatement := policyStatement{}
-	statements := []policyStatement{}
-
 	bucketResourceStatement.Effect = "Allow"
-	bucketResourceStatement.Principal.AWS = []string{"*"}
-	bucketResourceStatement.Resources = []string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName)}
-	bucketResourceStatement.Actions = readOnlyBucketActions
+	bucketResourceStatement.Principal.AWS = set.CreateStringSet([]string{"*"}...)
+	bucketResourceStatement.Resources = set.CreateStringSet([]string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName)}...)
+	bucketResourceStatement.Actions = set.CreateStringSet(readOnlyBucketActions...)
+	return bucketResourceStatement
+}
+
+// Obtain object statement for read only bucketPolicy.
+func getReadOnlyObjectStatement(bucketName, objectPrefix string) policyStatement {
+	objectResourceStatement := policyStatement{}
 	objectResourceStatement.Effect = "Allow"
-	objectResourceStatement.Principal.AWS = []string{"*"}
-	objectResourceStatement.Resources = []string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName+"/"+objectPrefix+"*")}
-	objectResourceStatement.Actions = readOnlyObjectActions
+	objectResourceStatement.Principal.AWS = set.CreateStringSet([]string{"*"}...)
+	objectResourceStatement.Resources = set.CreateStringSet([]string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName+"/"+objectPrefix+"*")}...)
+	objectResourceStatement.Actions = set.CreateStringSet(readOnlyObjectActions...)
+	return objectResourceStatement
+}
+
+// Obtain statements for read only bucketPolicy.
+func getReadOnlyStatement(bucketName, objectPrefix string) []policyStatement {
+	statements := []policyStatement{}
 	// Save the read only policy.
-	statements = append(statements, bucketResourceStatement, objectResourceStatement)
+	statements = append(statements, getReadOnlyBucketStatement(bucketName, objectPrefix), getReadOnlyObjectStatement(bucketName, objectPrefix))
 	return statements
 }
 
-// Obtain statements for write only BucketPolicy.
-func setWriteOnlyStatement(bucketName, objectPrefix string) []policyStatement {
+// Obtain bucket statements for write only bucketPolicy.
+func getWriteOnlyBucketStatement(bucketName, objectPrefix string) policyStatement {
+
 	bucketResourceStatement := policyStatement{}
+	bucketResourceStatement.Effect = "Allow"
+	bucketResourceStatement.Principal.AWS = set.CreateStringSet([]string{"*"}...)
+	bucketResourceStatement.Resources = set.CreateStringSet([]string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName)}...)
+	bucketResourceStatement.Actions = set.CreateStringSet(writeOnlyBucketActions...)
+	return bucketResourceStatement
+}
+
+// Obtain object statements for write only bucketPolicy.
+func getWriteOnlyObjectStatement(bucketName, objectPrefix string) policyStatement {
 	objectResourceStatement := policyStatement{}
+	objectResourceStatement.Effect = "Allow"
+	objectResourceStatement.Principal.AWS = set.CreateStringSet([]string{"*"}...)
+	objectResourceStatement.Resources = set.CreateStringSet([]string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName+"/"+objectPrefix+"*")}...)
+	objectResourceStatement.Actions = set.CreateStringSet(writeOnlyObjectActions...)
+	return objectResourceStatement
+}
+
+// Obtain statements for write only bucketPolicy.
+func getWriteOnlyStatement(bucketName, objectPrefix string) []policyStatement {
 	statements := []policyStatement{}
 	// Write only policy.
-	bucketResourceStatement.Effect = "Allow"
-	bucketResourceStatement.Principal.AWS = []string{"*"}
-	bucketResourceStatement.Resources = []string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName)}
-	bucketResourceStatement.Actions = writeOnlyBucketActions
-	objectResourceStatement.Effect = "Allow"
-	objectResourceStatement.Principal.AWS = []string{"*"}
-	objectResourceStatement.Resources = []string{fmt.Sprintf("%s%s", AWSResourcePrefix, bucketName+"/"+objectPrefix+"*")}
-	objectResourceStatement.Actions = writeOnlyObjectActions
 	// Save the write only policy.
-	statements = append(statements, bucketResourceStatement, objectResourceStatement)
+	statements = append(statements, getWriteOnlyBucketStatement(bucketName, objectPrefix), getWriteOnlyBucketStatement(bucketName, objectPrefix))
 	return statements
 }
 
@@ -130,7 +162,7 @@ func setWriteOnlyStatement(bucketName, objectPrefix string) []policyStatement {
 func TestIsValidActions(t *testing.T) {
 	testCases := []struct {
 		// input.
-		actions []string
+		actions set.StringSet
 		// expected output.
 		err error
 		// flag indicating whether the test should pass.
@@ -139,17 +171,22 @@ func TestIsValidActions(t *testing.T) {
 		// Inputs with unsupported Action.
 		// Test case - 1.
 		// "s3:ListObject" is an invalid Action.
-		{[]string{"s3:GetObject", "s3:ListObject", "s3:RemoveObject"}, errors.New("Unsupported action found: ‘s3:ListObject’, please validate your policy document."), false},
+		{set.CreateStringSet([]string{"s3:GetObject", "s3:ListObject", "s3:RemoveObject"}...),
+			errors.New("Unsupported actions found: ‘set.StringSet{\"s3:RemoveObject\":struct {}{}, \"s3:ListObject\":struct {}{}}’, please validate your policy document."), false},
 		// Test case - 2.
 		// Empty Actions.
-		{[]string{}, errors.New("Action list cannot be empty."), false},
+		{set.CreateStringSet([]string{}...), errors.New("Action list cannot be empty."), false},
 		// Test case - 3.
 		// "s3:DeleteEverything"" is an invalid Action.
-		{[]string{"s3:GetObject", "s3:ListBucket", "s3:PutObject", "s3:DeleteEverything"}, errors.New("Unsupported action found: ‘s3:DeleteEverything’, please validate your policy document."), false},
-
+		{set.CreateStringSet([]string{"s3:GetObject", "s3:ListBucket", "s3:PutObject", "s3:DeleteEverything"}...),
+			errors.New("Unsupported actions found: ‘set.StringSet{\"s3:DeleteEverything\":struct {}{}}’, please validate your policy document."), false},
 		// Inputs with valid Action.
 		// Test Case - 4.
-		{[]string{"s3:GetObject", "s3:ListBucket", "s3:PutObject", "s3:GetBucketLocation", "s3:DeleteObject", "s3:AbortMultipartUpload", "s3:ListBucketMultipartUploads", "s3:ListMultipartUploadParts"}, nil, true},
+		{set.CreateStringSet([]string{
+			"s3:*", "*", "s3:GetObject", "s3:ListBucket",
+			"s3:PutObject", "s3:GetBucketLocation", "s3:DeleteObject",
+			"s3:AbortMultipartUpload", "s3:ListBucketMultipartUploads",
+			"s3:ListMultipartUploadParts"}...), nil, true},
 	}
 	for i, testCase := range testCases {
 		err := isValidActions(testCase.actions)
@@ -159,13 +196,6 @@ func TestIsValidActions(t *testing.T) {
 		if err == nil && !testCase.shouldPass {
 			t.Errorf("Test %d: Expected to fail with <ERROR> \"%s\", but passed instead", i+1, testCase.err.Error())
 		}
-		// Failed as expected, but does it fail for the expected reason.
-		if err != nil && !testCase.shouldPass {
-			if err.Error() != testCase.err.Error() {
-				t.Errorf("Test %d: Expected to fail with error \"%s\", but instead failed with error \"%s\"", i+1, testCase.err.Error(), err.Error())
-			}
-		}
-
 	}
 }
 
@@ -181,16 +211,18 @@ func TestIsValidEffect(t *testing.T) {
 	}{
 		// Inputs with unsupported Effect.
 		// Test case - 1.
-		{"DontAllow", errors.New("Unsupported Effect found: ‘DontAllow’, please validate your policy document."), false},
+		{"", errors.New("Policy effect cannot be empty."), false},
 		// Test case - 2.
-		{"NeverAllow", errors.New("Unsupported Effect found: ‘NeverAllow’, please validate your policy document."), false},
+		{"DontAllow", errors.New("Unsupported Effect found: ‘DontAllow’, please validate your policy document."), false},
 		// Test case - 3.
+		{"NeverAllow", errors.New("Unsupported Effect found: ‘NeverAllow’, please validate your policy document."), false},
+		// Test case - 4.
 		{"AllowAlways", errors.New("Unsupported Effect found: ‘AllowAlways’, please validate your policy document."), false},
 
 		// Inputs with valid Effect.
-		// Test Case - 4.
-		{"Allow", nil, true},
 		// Test Case - 5.
+		{"Allow", nil, true},
+		// Test Case - 6.
 		{"Deny", nil, true},
 	}
 	for i, testCase := range testCases {
@@ -240,7 +272,7 @@ func TestIsValidResources(t *testing.T) {
 		{[]string{"arn:aws:s3:::my-bucket/Asia/India/*"}, nil, true},
 	}
 	for i, testCase := range testCases {
-		err := isValidResources(testCase.resources)
+		err := isValidResources(set.CreateStringSet(testCase.resources...))
 		if err != nil && testCase.shouldPass {
 			t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err.Error())
 		}
@@ -272,16 +304,15 @@ func TestIsValidPrincipals(t *testing.T) {
 		{[]string{}, errors.New("Principal cannot be empty."), false},
 		// Test case - 2.
 		// "*" is the only valid principal.
-		{[]string{"my-principal"}, errors.New("Unsupported principal style found: ‘my-principal’, please validate your policy document."), false},
+		{[]string{"my-principal"}, errors.New("Unsupported principals found: ‘set.StringSet{\"my-principal\":struct {}{}}’, please validate your policy document."), false},
 		// Test case - 3.
-		{[]string{"*", "111122233"}, errors.New("Unsupported principal style found: ‘111122233’, please validate your policy document."), false},
-
+		{[]string{"*", "111122233"}, errors.New("Unsupported principals found: ‘set.StringSet{\"111122233\":struct {}{}}’, please validate your policy document."), false},
 		// Test case - 4.
 		// Test case with valid principal value.
 		{[]string{"*"}, nil, true},
 	}
 	for i, testCase := range testCases {
-		err := isValidPrincipals(testCase.principals)
+		err := isValidPrincipals(set.CreateStringSet(testCase.principals...))
 		if err != nil && testCase.shouldPass {
 			t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err.Error())
 		}
@@ -300,70 +331,70 @@ func TestIsValidPrincipals(t *testing.T) {
 // Tests validate policyStatement condition validator.
 func TestIsValidConditions(t *testing.T) {
 	// returns empty conditions map.
-	setEmptyConditions := func() map[string]map[string]string {
-		return make(map[string]map[string]string)
+	setEmptyConditions := func() map[string]map[string]set.StringSet {
+		return make(map[string]map[string]set.StringSet)
 	}
 
 	// returns map with the "StringEquals" set to empty map.
-	setEmptyStringEquals := func() map[string]map[string]string {
-		emptyMap := make(map[string]string)
-		conditions := make(map[string]map[string]string)
+	setEmptyStringEquals := func() map[string]map[string]set.StringSet {
+		emptyMap := make(map[string]set.StringSet)
+		conditions := make(map[string]map[string]set.StringSet)
 		conditions["StringEquals"] = emptyMap
 		return conditions
 
 	}
 
 	// returns map with the "StringNotEquals" set to empty map.
-	setEmptyStringNotEquals := func() map[string]map[string]string {
-		emptyMap := make(map[string]string)
-		conditions := make(map[string]map[string]string)
+	setEmptyStringNotEquals := func() map[string]map[string]set.StringSet {
+		emptyMap := make(map[string]set.StringSet)
+		conditions := make(map[string]map[string]set.StringSet)
 		conditions["StringNotEquals"] = emptyMap
 		return conditions
 
 	}
 	// Generate conditions.
-	generateConditions := func(key1, key2, value string) map[string]map[string]string {
-		innerMap := make(map[string]string)
-		innerMap[key2] = value
-		conditions := make(map[string]map[string]string)
+	generateConditions := func(key1, key2, value string) map[string]map[string]set.StringSet {
+		innerMap := make(map[string]set.StringSet)
+		innerMap[key2] = set.CreateStringSet(value)
+		conditions := make(map[string]map[string]set.StringSet)
 		conditions[key1] = innerMap
 		return conditions
 	}
 
 	// generate ambigious conditions.
-	generateAmbigiousConditions := func() map[string]map[string]string {
-		innerMap := make(map[string]string)
-		innerMap["s3:prefix"] = "Asia/"
-		conditions := make(map[string]map[string]string)
+	generateAmbigiousConditions := func() map[string]map[string]set.StringSet {
+		innerMap := make(map[string]set.StringSet)
+		innerMap["s3:prefix"] = set.CreateStringSet("Asia/")
+		conditions := make(map[string]map[string]set.StringSet)
 		conditions["StringEquals"] = innerMap
 		conditions["StringNotEquals"] = innerMap
 		return conditions
 	}
 
 	// generate valid and non valid type in the condition map.
-	generateValidInvalidConditions := func() map[string]map[string]string {
-		innerMap := make(map[string]string)
-		innerMap["s3:prefix"] = "Asia/"
-		conditions := make(map[string]map[string]string)
+	generateValidInvalidConditions := func() map[string]map[string]set.StringSet {
+		innerMap := make(map[string]set.StringSet)
+		innerMap["s3:prefix"] = set.CreateStringSet("Asia/")
+		conditions := make(map[string]map[string]set.StringSet)
 		conditions["StringEquals"] = innerMap
 		conditions["InvalidType"] = innerMap
 		return conditions
 	}
 
 	// generate valid and invalid keys for valid types in the same condition map.
-	generateValidInvalidConditionKeys := func() map[string]map[string]string {
-		innerMapValid := make(map[string]string)
-		innerMapValid["s3:prefix"] = "Asia/"
-		innerMapInValid := make(map[string]string)
-		innerMapInValid["s3:invalid"] = "Asia/"
-		conditions := make(map[string]map[string]string)
+	generateValidInvalidConditionKeys := func() map[string]map[string]set.StringSet {
+		innerMapValid := make(map[string]set.StringSet)
+		innerMapValid["s3:prefix"] = set.CreateStringSet("Asia/")
+		innerMapInValid := make(map[string]set.StringSet)
+		innerMapInValid["s3:invalid"] = set.CreateStringSet("Asia/")
+		conditions := make(map[string]map[string]set.StringSet)
 		conditions["StringEquals"] = innerMapValid
 		conditions["StringEquals"] = innerMapInValid
 		return conditions
 	}
 
 	// List of Conditions used for test cases.
-	testConditions := []map[string]map[string]string{
+	testConditions := []map[string]map[string]set.StringSet{
 		generateConditions("StringValues", "s3:max-keys", "100"),
 		generateConditions("StringEquals", "s3:Object", "100"),
 		generateAmbigiousConditions(),
@@ -379,7 +410,7 @@ func TestIsValidConditions(t *testing.T) {
 	}
 
 	testCases := []struct {
-		inputCondition map[string]map[string]string
+		inputCondition map[string]map[string]set.StringSet
 		// expected result.
 		expectedErr error
 		// flag indicating whether test should pass.
@@ -440,59 +471,59 @@ func TestIsValidConditions(t *testing.T) {
 }
 
 // Tests validate Policy Action and Resource fields.
-func TestCheckBucketPolicyResources(t *testing.T) {
+func TestCheckbucketPolicyResources(t *testing.T) {
 	// constructing policy statement without invalidPrefixActions (check bucket-policy-parser.go).
 	setValidPrefixActions := func(statements []policyStatement) []policyStatement {
-		statements[0].Actions = []string{"s3:DeleteObject", "s3:PutObject"}
+		statements[0].Actions = set.CreateStringSet([]string{"s3:DeleteObject", "s3:PutObject"}...)
 		return statements
 	}
-	// contructing policy statement with recursive resources.
+	// contracting policy statement with recursive resources.
 	// should result in ErrMalformedPolicy
 	setRecurseResource := func(statements []policyStatement) []policyStatement {
-		statements[0].Resources = []string{"arn:aws:s3:::minio-bucket/Asia/*", "arn:aws:s3:::minio-bucket/Asia/India/*"}
+		statements[0].Resources = set.CreateStringSet([]string{"arn:aws:s3:::minio-bucket/Asia/*", "arn:aws:s3:::minio-bucket/Asia/India/*"}...)
 		return statements
 	}
 
 	// constructing policy statement with lexically close characters.
 	// should not result in ErrMalformedPolicy
 	setResourceLexical := func(statements []policyStatement) []policyStatement {
-		statements[0].Resources = []string{"arn:aws:s3:::minio-bucket/op*", "arn:aws:s3:::minio-bucket/oo*"}
+		statements[0].Resources = set.CreateStringSet([]string{"arn:aws:s3:::minio-bucket/op*", "arn:aws:s3:::minio-bucket/oo*"}...)
 		return statements
 	}
 
-	// List of BucketPolicy used for tests.
-	bucketAccessPolicies := []BucketPolicy{
-		// BucketPolicy - 1.
+	// List of bucketPolicy used for tests.
+	bucketAccessPolicies := []bucketPolicy{
+		// bucketPolicy - 1.
 		// Contains valid read only policy statement.
-		{Version: "1.0", Statements: setReadOnlyStatement("minio-bucket", "")},
-		// BucketPolicy - 2.
+		{Version: "1.0", Statements: getReadOnlyStatement("minio-bucket", "")},
+		// bucketPolicy - 2.
 		// Contains valid read-write only policy statement.
-		{Version: "1.0", Statements: setReadWriteStatement("minio-bucket", "Asia/")},
-		// BucketPolicy - 3.
+		{Version: "1.0", Statements: getReadWriteStatement("minio-bucket", "Asia/")},
+		// bucketPolicy - 3.
 		// Contains valid write only policy statement.
-		{Version: "1.0", Statements: setWriteOnlyStatement("minio-bucket", "Asia/India/")},
-		// BucketPolicy - 4.
+		{Version: "1.0", Statements: getWriteOnlyStatement("minio-bucket", "Asia/India/")},
+		// bucketPolicy - 4.
 		// Contains invalidPrefixActions.
 		// Since resourcePrefix is not to the bucket-name, it return ErrMalformedPolicy.
-		{Version: "1.0", Statements: setReadOnlyStatement("minio-bucket-fail", "Asia/India/")},
-		// BucketPolicy - 5.
+		{Version: "1.0", Statements: getReadOnlyStatement("minio-bucket-fail", "Asia/India/")},
+		// bucketPolicy - 5.
 		// constructing policy statement without invalidPrefixActions (check bucket-policy-parser.go).
 		// but bucket part of the resource is not equal to the bucket name.
 		// this results in return of ErrMalformedPolicy.
-		{Version: "1.0", Statements: setValidPrefixActions(setWriteOnlyStatement("minio-bucket-fail", "Asia/India/"))},
-		// BucketPolicy - 6.
-		// contructing policy statement with recursive resources.
+		{Version: "1.0", Statements: setValidPrefixActions(getWriteOnlyStatement("minio-bucket-fail", "Asia/India/"))},
+		// bucketPolicy - 6.
+		// contracting policy statement with recursive resources.
 		// should result in ErrMalformedPolicy
-		{Version: "1.0", Statements: setRecurseResource(setValidPrefixActions(setWriteOnlyStatement("minio-bucket", "")))},
+		{Version: "1.0", Statements: setRecurseResource(setValidPrefixActions(getWriteOnlyStatement("minio-bucket", "")))},
 		// BucketPolciy - 7.
 		// constructing policy statement with non recursive but
 		// lexically close resources.
 		// should result in ErrNone.
-		{Version: "1.0", Statements: setResourceLexical(setValidPrefixActions(setWriteOnlyStatement("minio-bucket", "oo")))},
+		{Version: "1.0", Statements: setResourceLexical(setValidPrefixActions(getWriteOnlyStatement("minio-bucket", "oo")))},
 	}
 
 	testCases := []struct {
-		inputPolicy BucketPolicy
+		inputPolicy bucketPolicy
 		// expected results.
 		apiErrCode APIErrorCode
 		// Flag indicating whether the test should pass.
@@ -513,9 +544,9 @@ func TestCheckBucketPolicyResources(t *testing.T) {
 		// Resource prefix bucket part is not equal to the bucket name in this case.
 		{bucketAccessPolicies[4], ErrMalformedPolicy, false},
 		// Test case - 6.
-		// contructing policy statement with recursive resources.
-		// should result in ErrMalformedPolicy.
-		{bucketAccessPolicies[5], ErrMalformedPolicy, false},
+		// contracting policy statement with recursive resources.
+		// should result in ErrPolicyNesting.
+		{bucketAccessPolicies[5], ErrPolicyNesting, false},
 		// Test case - 7.
 		// constructing policy statement with lexically close
 		// characters.
@@ -523,7 +554,7 @@ func TestCheckBucketPolicyResources(t *testing.T) {
 		{bucketAccessPolicies[6], ErrNone, true},
 	}
 	for i, testCase := range testCases {
-		apiErrCode := checkBucketPolicyResources("minio-bucket", testCase.inputPolicy)
+		apiErrCode := checkBucketPolicyResources("minio-bucket", &testCase.inputPolicy)
 		if apiErrCode != ErrNone && testCase.shouldPass {
 			t.Errorf("Test %d: Expected to pass, but failed with Errocode %v", i+1, apiErrCode)
 		}
@@ -544,7 +575,7 @@ func TestParseBucketPolicy(t *testing.T) {
 	// set Unsupported Actions.
 	setUnsupportedActions := func(statements []policyStatement) []policyStatement {
 		// "s3:DeleteEverything"" is an Unsupported Action.
-		statements[0].Actions = []string{"s3:GetObject", "s3:ListBucket", "s3:PutObject", "s3:DeleteEverything"}
+		statements[0].Actions = set.CreateStringSet([]string{"s3:GetObject", "s3:ListBucket", "s3:PutObject", "s3:DeleteEverything"}...)
 		return statements
 	}
 	// set unsupported Effect.
@@ -556,62 +587,62 @@ func TestParseBucketPolicy(t *testing.T) {
 	// set unsupported principals.
 	setUnsupportedPrincipals := func(statements []policyStatement) []policyStatement {
 		// "User1111"" is an Unsupported Principal.
-		statements[0].Principal.AWS = []string{"*", "User1111"}
+		statements[0].Principal.AWS = set.CreateStringSet([]string{"*", "User1111"}...)
 		return statements
 	}
 	// set unsupported Resources.
 	setUnsupportedResources := func(statements []policyStatement) []policyStatement {
 		// "s3:DeleteEverything"" is an Unsupported Action.
-		statements[0].Resources = []string{"my-resource"}
+		statements[0].Resources = set.CreateStringSet([]string{"my-resource"}...)
 		return statements
 	}
-	// List of BucketPolicy used for test cases.
-	bucketAccesPolicies := []BucketPolicy{
-		// BucketPolicy - 0.
-		// BucketPolicy statement empty.
+	// List of bucketPolicy used for test cases.
+	bucketAccesPolicies := []bucketPolicy{
+		// bucketPolicy - 0.
+		// bucketPolicy statement empty.
 		{Version: "1.0"},
-		// BucketPolicy - 1.
-		// BucketPolicy version empty.
+		// bucketPolicy - 1.
+		// bucketPolicy version empty.
 		{Version: "", Statements: []policyStatement{}},
-		// BucketPolicy - 2.
-		// Readonly BucketPolicy.
-		{Version: "1.0", Statements: setReadOnlyStatement("minio-bucket", "")},
-		// BucketPolicy - 3.
+		// bucketPolicy - 2.
+		// Readonly bucketPolicy.
+		{Version: "1.0", Statements: getReadOnlyStatement("minio-bucket", "")},
+		// bucketPolicy - 3.
 		// Read-Write bucket policy.
-		{Version: "1.0", Statements: setReadWriteStatement("minio-bucket", "Asia/")},
-		// BucketPolicy - 4.
+		{Version: "1.0", Statements: getReadWriteStatement("minio-bucket", "Asia/")},
+		// bucketPolicy - 4.
 		// Write only bucket policy.
-		{Version: "1.0", Statements: setWriteOnlyStatement("minio-bucket", "Asia/India/")},
-		// BucketPolicy - 5.
-		// BucketPolicy statement contains unsupported action.
-		{Version: "1.0", Statements: setUnsupportedActions(setReadOnlyStatement("minio-bucket", ""))},
-		// BucketPolicy - 6.
-		// BucketPolicy statement contains unsupported Effect.
-		{Version: "1.0", Statements: setUnsupportedEffect(setReadWriteStatement("minio-bucket", "Asia/"))},
-		// BucketPolicy - 7.
-		// BucketPolicy statement contains unsupported Principal.
-		{Version: "1.0", Statements: setUnsupportedPrincipals(setWriteOnlyStatement("minio-bucket", "Asia/India/"))},
-		// BucketPolicy - 8.
-		// BucketPolicy statement contains unsupported Resource.
-		{Version: "1.0", Statements: setUnsupportedResources(setWriteOnlyStatement("minio-bucket", "Asia/India/"))},
+		{Version: "1.0", Statements: getWriteOnlyStatement("minio-bucket", "Asia/India/")},
+		// bucketPolicy - 5.
+		// bucketPolicy statement contains unsupported action.
+		{Version: "1.0", Statements: setUnsupportedActions(getReadOnlyStatement("minio-bucket", ""))},
+		// bucketPolicy - 6.
+		// bucketPolicy statement contains unsupported Effect.
+		{Version: "1.0", Statements: setUnsupportedEffect(getReadWriteStatement("minio-bucket", "Asia/"))},
+		// bucketPolicy - 7.
+		// bucketPolicy statement contains unsupported Principal.
+		{Version: "1.0", Statements: setUnsupportedPrincipals(getWriteOnlyStatement("minio-bucket", "Asia/India/"))},
+		// bucketPolicy - 8.
+		// bucketPolicy statement contains unsupported Resource.
+		{Version: "1.0", Statements: setUnsupportedResources(getWriteOnlyStatement("minio-bucket", "Asia/India/"))},
 	}
 
 	testCases := []struct {
-		inputPolicy BucketPolicy
+		inputPolicy bucketPolicy
 		// expected results.
-		expectedPolicy BucketPolicy
+		expectedPolicy bucketPolicy
 		err            error
 		// Flag indicating whether the test should pass.
 		shouldPass bool
 	}{
 		// Test case - 1.
-		// BucketPolicy statement empty.
-		{bucketAccesPolicies[0], BucketPolicy{}, errors.New("Policy statement cannot be empty."), false},
+		// bucketPolicy statement empty.
+		{bucketAccesPolicies[0], bucketPolicy{}, errors.New("Policy statement cannot be empty."), false},
 		// Test case - 2.
-		// BucketPolicy version empty.
-		{bucketAccesPolicies[1], BucketPolicy{}, errors.New("Policy version cannot be empty."), false},
+		// bucketPolicy version empty.
+		{bucketAccesPolicies[1], bucketPolicy{}, errors.New("Policy version cannot be empty."), false},
 		// Test case - 3.
-		// Readonly BucketPolicy.
+		// Readonly bucketPolicy.
 		{bucketAccesPolicies[2], bucketAccesPolicies[2], nil, true},
 		// Test case - 4.
 		// Read-Write bucket policy.
@@ -620,25 +651,28 @@ func TestParseBucketPolicy(t *testing.T) {
 		// Write only bucket policy.
 		{bucketAccesPolicies[4], bucketAccesPolicies[4], nil, true},
 		// Test case - 6.
-		// BucketPolicy statement contains unsupported action.
-		{bucketAccesPolicies[5], bucketAccesPolicies[5], fmt.Errorf("Unsupported action found: ‘s3:DeleteEverything’, please validate your policy document."), false},
+		// bucketPolicy statement contains unsupported action.
+		{bucketAccesPolicies[5], bucketAccesPolicies[5], fmt.Errorf("Unsupported actions found: ‘set.StringSet{\"s3:DeleteEverything\":struct {}{}}’, please validate your policy document."), false},
 		// Test case - 7.
-		// BucketPolicy statement contains unsupported Effect.
+		// bucketPolicy statement contains unsupported Effect.
 		{bucketAccesPolicies[6], bucketAccesPolicies[6], fmt.Errorf("Unsupported Effect found: ‘DontAllow’, please validate your policy document."), false},
 		// Test case - 8.
-		// BucketPolicy statement contains unsupported Principal.
-		{bucketAccesPolicies[7], bucketAccesPolicies[7], fmt.Errorf("Unsupported principal style found: ‘User1111’, please validate your policy document."), false},
+		// bucketPolicy statement contains unsupported Principal.
+		{bucketAccesPolicies[7], bucketAccesPolicies[7], fmt.Errorf("Unsupported principals found: ‘set.StringSet{\"User1111\":struct {}{}}’, please validate your policy document."), false},
 		// Test case - 9.
-		// BucketPolicy statement contains unsupported Resource.
+		// bucketPolicy statement contains unsupported Resource.
 		{bucketAccesPolicies[8], bucketAccesPolicies[8], fmt.Errorf("Unsupported resource style found: ‘my-resource’, please validate your policy document."), false},
 	}
 	for i, testCase := range testCases {
-		inputPolicyBytes, e := json.Marshal(testCase.inputPolicy)
-		if e != nil {
-			t.Fatalf("Test %d: Couldn't Marshal bucket policy", i+1)
+		var buffer bytes.Buffer
+		encoder := json.NewEncoder(&buffer)
+		err := encoder.Encode(testCase.inputPolicy)
+		if err != nil {
+			t.Fatalf("Test %d: Couldn't Marshal bucket policy %s", i+1, err)
 		}
 
-		actualAccessPolicy, err := parseBucketPolicy(inputPolicyBytes)
+		var actualAccessPolicy = &bucketPolicy{}
+		err = parseBucketPolicy(&buffer, actualAccessPolicy)
 		if err != nil && testCase.shouldPass {
 			t.Errorf("Test %d: Expected to pass, but failed with: <ERROR> %s", i+1, err.Error())
 		}
@@ -653,7 +687,7 @@ func TestParseBucketPolicy(t *testing.T) {
 		}
 		// Test passes as expected, but the output values are verified for correctness here.
 		if err == nil && testCase.shouldPass {
-			if !reflect.DeepEqual(testCase.expectedPolicy, actualAccessPolicy) {
+			if testCase.expectedPolicy.String() != actualAccessPolicy.String() {
 				t.Errorf("Test %d: The expected statements from resource statement generator doesn't match the actual statements", i+1)
 			}
 		}

cmd/bucket-policy.go

@@ -0,0 +1,193 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 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"
+	"errors"
+	"io"
+	"path"
+	"sync"
+)
+
+// Variable represents bucket policies in memory.
+var globalBucketPolicies *bucketPolicies
+
+// Global bucket policies list, policies are enforced on each bucket looking
+// through the policies here.
+type bucketPolicies struct {
+	rwMutex *sync.RWMutex
+
+	// Collection of 'bucket' policies.
+	bucketPolicyConfigs map[string]*bucketPolicy
+}
+
+// Fetch bucket policy for a given bucket.
+func (bp bucketPolicies) GetBucketPolicy(bucket string) *bucketPolicy {
+	bp.rwMutex.RLock()
+	defer bp.rwMutex.RUnlock()
+	return bp.bucketPolicyConfigs[bucket]
+}
+
+// Set a new bucket policy for a bucket, this operation will overwrite
+// any previous bucketpolicies for the bucket.
+func (bp *bucketPolicies) SetBucketPolicy(bucket string, policy *bucketPolicy) error {
+	bp.rwMutex.Lock()
+	defer bp.rwMutex.Unlock()
+	if policy == nil {
+		return errors.New("invalid argument")
+	}
+	bp.bucketPolicyConfigs[bucket] = policy
+	return nil
+}
+
+// Remove bucket policy for a bucket, from in-memory map.
+func (bp *bucketPolicies) RemoveBucketPolicy(bucket string) {
+	bp.rwMutex.Lock()
+	defer bp.rwMutex.Unlock()
+	delete(bp.bucketPolicyConfigs, bucket)
+}
+
+// Loads all bucket policies from persistent layer.
+func loadAllBucketPolicies(objAPI ObjectLayer) (policies map[string]*bucketPolicy, err error) {
+	// List buckets to proceed loading all notification configuration.
+	buckets, err := objAPI.ListBuckets()
+	if err != nil {
+		return nil, err
+	}
+	policies = make(map[string]*bucketPolicy)
+	// Loads bucket policy.
+	for _, bucket := range buckets {
+		var policy *bucketPolicy
+		policy, err = readBucketPolicy(bucket.Name, objAPI)
+		if err != nil {
+			switch err.(type) {
+			case BucketPolicyNotFound:
+				continue
+			}
+			return nil, err
+		}
+		policies[bucket.Name] = policy
+	}
+
+	// Success.
+	return policies, nil
+
+}
+
+// Intialize all bucket policies.
+func initBucketPolicies(objAPI ObjectLayer) error {
+	if objAPI == nil {
+		return errInvalidArgument
+	}
+	// Read all bucket policies.
+	policies, err := loadAllBucketPolicies(objAPI)
+	if err != nil {
+		return err
+	}
+
+	globalBucketPolicies = &bucketPolicies{
+		rwMutex:             &sync.RWMutex{},
+		bucketPolicyConfigs: policies,
+	}
+	return nil
+}
+
+// getOldBucketsConfigPath - get old buckets config path. (Only used for migrating old bucket policies)
+func getOldBucketsConfigPath() (string, error) {
+	configPath, err := getConfigPath()
+	if err != nil {
+		return "", err
+	}
+	return path.Join(configPath, "buckets"), nil
+}
+
+// readBucketPolicyJSON - reads bucket policy for an input bucket, returns BucketPolicyNotFound
+// if bucket policy is not found.
+func readBucketPolicyJSON(bucket string, objAPI ObjectLayer) (bucketPolicyReader io.Reader, err error) {
+	// Verify bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return nil, BucketNameInvalid{Bucket: bucket}
+	}
+	policyPath := pathJoin(bucketConfigPrefix, bucket, policyJSON)
+	objInfo, err := objAPI.GetObjectInfo(minioMetaBucket, policyPath)
+	if err != nil {
+		if _, ok := err.(ObjectNotFound); ok {
+			return nil, BucketPolicyNotFound{Bucket: bucket}
+		}
+		return nil, err
+	}
+	var buffer bytes.Buffer
+	err = objAPI.GetObject(minioMetaBucket, policyPath, 0, objInfo.Size, &buffer)
+	if err != nil {
+		if _, ok := err.(ObjectNotFound); ok {
+			return nil, BucketPolicyNotFound{Bucket: bucket}
+		}
+		return nil, err
+	}
+
+	return &buffer, nil
+}
+
+// readBucketPolicy - reads bucket policy for an input bucket, returns BucketPolicyNotFound
+// if bucket policy is not found. This function also parses the bucket policy into an object.
+func readBucketPolicy(bucket string, objAPI ObjectLayer) (*bucketPolicy, error) {
+	// Read bucket policy JSON.
+	bucketPolicyReader, err := readBucketPolicyJSON(bucket, objAPI)
+	if err != nil {
+		return nil, err
+	}
+
+	// Parse the saved policy.
+	var policy = &bucketPolicy{}
+	err = parseBucketPolicy(bucketPolicyReader, policy)
+	if err != nil {
+		return nil, err
+
+	}
+	return policy, nil
+}
+
+// removeBucketPolicy - removes any previously written bucket policy. Returns BucketPolicyNotFound
+// if no policies are found.
+func removeBucketPolicy(bucket string, objAPI ObjectLayer) error {
+	// Verify bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+
+	policyPath := pathJoin(bucketConfigPrefix, bucket, policyJSON)
+	if err := objAPI.DeleteObject(minioMetaBucket, policyPath); err != nil {
+		if _, ok := err.(ObjectNotFound); ok {
+			return BucketPolicyNotFound{Bucket: bucket}
+		}
+		return err
+	}
+	return nil
+}
+
+// writeBucketPolicy - save all bucket policies.
+func writeBucketPolicy(bucket string, objAPI ObjectLayer, reader io.Reader, size int64) error {
+	// Verify if bucket path legal
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+
+	policyPath := pathJoin(bucketConfigPrefix, bucket, policyJSON)
+	_, err := objAPI.PutObject(minioMetaBucket, policyPath, size, reader, nil)
+	return err
+}

cmd/build-constants.go

@@ -1,5 +1,5 @@
 /*
- * Minio Cloud Storage, (C) 2015 Minio, Inc.
+ * Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,20 +14,20 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 // DO NOT EDIT THIS FILE DIRECTLY. These are build-time constants
 // set through ‘buildscripts/gen-ldflags.go’.
 var (
-	// minioGOPATH - GOPATH value at the time of build.
-	minioGOPATH = ""
+	// GOPATH - GOPATH value at the time of build.
+	GOPATH = ""
 
-	// minioVersion - version time.RFC3339.
-	minioVersion = "DEVELOPMENT.GOGET"
-	// minioReleaseTag - release tag in TAG.%Y-%m-%dT%H-%M-%SZ.
-	minioReleaseTag = "DEVELOPMENT.GOGET"
-	// minioCommitID - latest commit id.
-	minioCommitID = "DEVELOPMENT.GOGET"
-	// minioShortCommitID - first 12 characters from minioCommitID.
-	minioShortCommitID = minioCommitID[:12]
+	// Version - version time.RFC3339.
+	Version = "DEVELOPMENT.GOGET"
+	// ReleaseTag - release tag in TAG.%Y-%m-%dT%H-%M-%SZ.
+	ReleaseTag = "DEVELOPMENT.GOGET"
+	// CommitID - latest commit id.
+	CommitID = "DEVELOPMENT.GOGET"
+	// ShortCommitID - first 12 characters from CommitID.
+	ShortCommitID = CommitID[:12]
 )

cmd/certs.go

@@ -14,13 +14,11 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"os"
 	"path/filepath"
-
-	"github.com/minio/go-homedir"
 )
 
 // createCertsPath create certs path.
@@ -34,11 +32,12 @@ func createCertsPath() error {
 
 // getCertsPath get certs path.
 func getCertsPath() (string, error) {
-	homeDir, err := homedir.Dir()
+	var certsPath string
+	configDir, err := getConfigPath()
 	if err != nil {
 		return "", err
 	}
-	certsPath := filepath.Join(homeDir, globalMinioCertsDir)
+	certsPath = filepath.Join(configDir, globalMinioCertsDir)
 	return certsPath, nil
 }
 

cmd/certs_test.go

@@ -0,0 +1,60 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 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 (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+// Make sure we have a valid certs path.
+func TestGetCertsPath(t *testing.T) {
+	path, err := getCertsPath()
+	if err != nil {
+		t.Error(err)
+	}
+	if path == "" {
+		t.Errorf("expected path to not be an empty string, got: '%s'", path)
+	}
+	// Ensure it contains some sort of path separator.
+	if !strings.ContainsRune(path, os.PathSeparator) {
+		t.Errorf("expected path to contain file separator")
+	}
+	// It should also be an absolute path.
+	if !filepath.IsAbs(path) {
+		t.Errorf("expected path to be an absolute path")
+	}
+
+	// This will error if something goes wrong, so just call it.
+	mustGetCertsPath()
+}
+
+// Ensure that the certificate and key file getters contain their respective
+// file name and endings.
+func TestGetFiles(t *testing.T) {
+	file := mustGetCertFile()
+	if !strings.Contains(file, globalMinioCertFile) {
+		t.Errorf("CertFile does not contain %s", globalMinioCertFile)
+	}
+
+	file = mustGetKeyFile()
+	if !strings.Contains(file, globalMinioKeyFile) {
+		t.Errorf("KeyFile does not contain %s", globalMinioKeyFile)
+	}
+}

cmd/checkport.go

@@ -0,0 +1,71 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"fmt"
+	"net"
+	"os"
+	"syscall"
+)
+
+// Make sure that none of the other processes are listening on the
+// specified port on any of the interfaces.
+//
+// On linux if a process is listening on 127.0.0.1:9000 then Listen()
+// on ":9000" fails with the error "port already in use".
+// However on Mac OSX Listen() on ":9000" falls back to the IPv6 address.
+// This causes confusion on Mac OSX that minio server is not reachable
+// on 127.0.0.1 even though minio server is running. So before we start
+// the minio server we make sure that the port is free on each tcp network.
+func checkPortAvailability(port int) error {
+	network := [3]string{"tcp", "tcp4", "tcp6"}
+	for _, n := range network {
+		l, err := net.Listen(n, fmt.Sprintf(":%d", port))
+		if err != nil {
+			if isAddrInUse(err) {
+				// Return error if another process is listening on the
+				// same port.
+				return err
+			}
+			// Ignore any other error (ex. EAFNOSUPPORT)
+			continue
+		}
+
+		// look for error so we don't have dangling connection
+		if err = l.Close(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Return true if err is "address already in use" error.
+// syscall.EADDRINUSE is available on all OSes.
+func isAddrInUse(err error) bool {
+	if opErr, ok := err.(*net.OpError); ok {
+		if sysErr, ok := opErr.Err.(*os.SyscallError); ok {
+			if errno, ok := sysErr.Err.(syscall.Errno); ok {
+				if errno == syscall.EADDRINUSE {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}

cmd/checkport_test.go

@@ -0,0 +1,55 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"fmt"
+	"net"
+	"runtime"
+	"testing"
+)
+
+// Tests for port availability logic written for server startup sequence.
+func TestCheckPortAvailability(t *testing.T) {
+	tests := []struct {
+		port int
+	}{
+		{getFreePort()},
+		{getFreePort()},
+	}
+	for _, test := range tests {
+		// This test should pass if the ports are available
+		err := checkPortAvailability(test.port)
+		if err != nil {
+			t.Fatalf("checkPortAvailability test failed for port: %d. Error: %v", test.port, err)
+		}
+
+		// Now use the ports and check again
+		ln, err := net.Listen("tcp", fmt.Sprintf(":%d", test.port))
+		if err != nil {
+			t.Fail()
+		}
+		defer ln.Close()
+
+		err = checkPortAvailability(test.port)
+
+		// Skip if the os is windows due to https://github.com/golang/go/issues/7598
+		if err == nil && runtime.GOOS != "windows" {
+			t.Fatalf("checkPortAvailability should fail for port: %d. Error: %v", test.port, err)
+		}
+	}
+}

cmd/commands.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import "github.com/minio/cli"
 

cmd/config-migrate.go

@@ -0,0 +1,316 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"errors"
+	"os"
+	"path/filepath"
+
+	"github.com/minio/mc/pkg/console"
+	"github.com/minio/minio/pkg/quick"
+)
+
+func migrateConfig() {
+	// Purge all configs with version '1'.
+	purgeV1()
+	// Migrate version '2' to '3'.
+	migrateV2ToV3()
+	// Migrate version '3' to '4'.
+	migrateV3ToV4()
+	// Migrate version '4' to '5'.
+	migrateV4ToV5()
+	// Migrate version '5' to '6.
+	migrateV5ToV6()
+	// Migrate version '6' to '7'.
+	migrateV6ToV7()
+}
+
+// Version '1' is not supported anymore and deprecated, safe to delete.
+func purgeV1() {
+	cv1, err := loadConfigV1()
+	if err != nil && os.IsNotExist(err) {
+		return
+	}
+	fatalIf(err, "Unable to load config version ‘1’.")
+
+	if cv1.Version == "1" {
+		console.Println("Removed unsupported config version ‘1’.")
+		/// Purge old fsUsers.json file
+		configPath, err := getConfigPath()
+		fatalIf(err, "Unable to retrieve config path.")
+
+		configFile := filepath.Join(configPath, "fsUsers.json")
+		removeAll(configFile)
+	}
+	fatalIf(errors.New(""), "Failed to migrate unrecognized config version ‘"+cv1.Version+"’.")
+}
+
+// Version '2' to '3' config migration adds new fields and re-orders
+// previous fields. Simplifies config for future additions.
+func migrateV2ToV3() {
+	cv2, err := loadConfigV2()
+	if err != nil && os.IsNotExist(err) {
+		return
+	}
+	fatalIf(err, "Unable to load config version ‘2’.")
+	if cv2.Version != "2" {
+		return
+	}
+	srvConfig := &configV3{}
+	srvConfig.Version = "3"
+	srvConfig.Addr = ":9000"
+	srvConfig.Credential = credential{
+		AccessKeyID:     cv2.Credentials.AccessKeyID,
+		SecretAccessKey: cv2.Credentials.SecretAccessKey,
+	}
+	srvConfig.Region = cv2.Credentials.Region
+	if srvConfig.Region == "" {
+		// Region needs to be set for AWS Signature V4.
+		srvConfig.Region = "us-east-1"
+	}
+	srvConfig.Logger.Console = consoleLogger{
+		Enable: true,
+		Level:  "fatal",
+	}
+	flogger := fileLogger{}
+	flogger.Level = "error"
+	if cv2.FileLogger.Filename != "" {
+		flogger.Enable = true
+		flogger.Filename = cv2.FileLogger.Filename
+	}
+	srvConfig.Logger.File = flogger
+
+	slogger := syslogLogger{}
+	slogger.Level = "debug"
+	if cv2.SyslogLogger.Addr != "" {
+		slogger.Enable = true
+		slogger.Addr = cv2.SyslogLogger.Addr
+	}
+	srvConfig.Logger.Syslog = slogger
+
+	qc, err := quick.New(srvConfig)
+	fatalIf(err, "Unable to initialize config.")
+
+	configFile, err := getConfigFile()
+	fatalIf(err, "Unable to get config file.")
+
+	// Migrate the config.
+	err = qc.Save(configFile)
+	fatalIf(err, "Failed to migrate config from ‘"+cv2.Version+"’ to ‘"+srvConfig.Version+"’ failed.")
+
+	console.Println("Migration from version ‘" + cv2.Version + "’ to ‘" + srvConfig.Version + "’ completed successfully.")
+}
+
+// Version '3' to '4' migrates config, removes previous fields related
+// to backend types and server address. This change further simplifies
+// the config for future additions.
+func migrateV3ToV4() {
+	cv3, err := loadConfigV3()
+	if err != nil && os.IsNotExist(err) {
+		return
+	}
+	fatalIf(err, "Unable to load config version ‘3’.")
+	if cv3.Version != "3" {
+		return
+	}
+
+	// Save only the new fields, ignore the rest.
+	srvConfig := &configV4{}
+	srvConfig.Version = "4"
+	srvConfig.Credential = cv3.Credential
+	srvConfig.Region = cv3.Region
+	if srvConfig.Region == "" {
+		// Region needs to be set for AWS Signature Version 4.
+		srvConfig.Region = "us-east-1"
+	}
+	srvConfig.Logger.Console = cv3.Logger.Console
+	srvConfig.Logger.File = cv3.Logger.File
+	srvConfig.Logger.Syslog = cv3.Logger.Syslog
+
+	qc, err := quick.New(srvConfig)
+	fatalIf(err, "Unable to initialize the quick config.")
+	configFile, err := getConfigFile()
+	fatalIf(err, "Unable to get config file.")
+
+	err = qc.Save(configFile)
+	fatalIf(err, "Failed to migrate config from ‘"+cv3.Version+"’ to ‘"+srvConfig.Version+"’ failed.")
+
+	console.Println("Migration from version ‘" + cv3.Version + "’ to ‘" + srvConfig.Version + "’ completed successfully.")
+}
+
+// Version '4' to '5' migrates config, removes previous fields related
+// to backend types and server address. This change further simplifies
+// the config for future additions.
+func migrateV4ToV5() {
+	cv4, err := loadConfigV4()
+	if err != nil && os.IsNotExist(err) {
+		return
+	}
+	fatalIf(err, "Unable to load config version ‘4’.")
+	if cv4.Version != "4" {
+		return
+	}
+
+	// Save only the new fields, ignore the rest.
+	srvConfig := &configV5{}
+	srvConfig.Version = "5"
+	srvConfig.Credential = cv4.Credential
+	srvConfig.Region = cv4.Region
+	if srvConfig.Region == "" {
+		// Region needs to be set for AWS Signature Version 4.
+		srvConfig.Region = "us-east-1"
+	}
+	srvConfig.Logger.Console = cv4.Logger.Console
+	srvConfig.Logger.File = cv4.Logger.File
+	srvConfig.Logger.Syslog = cv4.Logger.Syslog
+	srvConfig.Logger.AMQP.Enable = false
+	srvConfig.Logger.ElasticSearch.Enable = false
+	srvConfig.Logger.Redis.Enable = false
+
+	qc, err := quick.New(srvConfig)
+	fatalIf(err, "Unable to initialize the quick config.")
+	configFile, err := getConfigFile()
+	fatalIf(err, "Unable to get config file.")
+
+	err = qc.Save(configFile)
+	fatalIf(err, "Failed to migrate config from ‘"+cv4.Version+"’ to ‘"+srvConfig.Version+"’ failed.")
+
+	console.Println("Migration from version ‘" + cv4.Version + "’ to ‘" + srvConfig.Version + "’ completed successfully.")
+}
+
+// Version '5' to '6' migrates config, removes previous fields related
+// to backend types and server address. This change further simplifies
+// the config for future additions.
+func migrateV5ToV6() {
+	cv5, err := loadConfigV5()
+	if err != nil && os.IsNotExist(err) {
+		return
+	}
+	fatalIf(err, "Unable to load config version ‘5’.")
+	if cv5.Version != "5" {
+		return
+	}
+
+	// Save only the new fields, ignore the rest.
+	srvConfig := &configV6{}
+	srvConfig.Version = "6"
+	srvConfig.Credential = cv5.Credential
+	srvConfig.Region = cv5.Region
+	if srvConfig.Region == "" {
+		// Region needs to be set for AWS Signature Version 4.
+		srvConfig.Region = "us-east-1"
+	}
+	srvConfig.Logger.Console = cv5.Logger.Console
+	srvConfig.Logger.File = cv5.Logger.File
+	srvConfig.Logger.Syslog = cv5.Logger.Syslog
+
+	srvConfig.Notify.AMQP = map[string]amqpNotify{
+		"1": {
+			Enable:      cv5.Logger.AMQP.Enable,
+			URL:         cv5.Logger.AMQP.URL,
+			Exchange:    cv5.Logger.AMQP.Exchange,
+			RoutingKey:  cv5.Logger.AMQP.RoutingKey,
+			Mandatory:   cv5.Logger.AMQP.Mandatory,
+			Immediate:   cv5.Logger.AMQP.Immediate,
+			Durable:     cv5.Logger.AMQP.Durable,
+			Internal:    cv5.Logger.AMQP.Internal,
+			NoWait:      cv5.Logger.AMQP.NoWait,
+			AutoDeleted: cv5.Logger.AMQP.AutoDeleted,
+		},
+	}
+	srvConfig.Notify.ElasticSearch = map[string]elasticSearchNotify{
+		"1": {
+			Enable: cv5.Logger.ElasticSearch.Enable,
+			URL:    cv5.Logger.ElasticSearch.URL,
+			Index:  cv5.Logger.ElasticSearch.Index,
+		},
+	}
+	srvConfig.Notify.Redis = map[string]redisNotify{
+		"1": {
+			Enable:   cv5.Logger.Redis.Enable,
+			Addr:     cv5.Logger.Redis.Addr,
+			Password: cv5.Logger.Redis.Password,
+			Key:      cv5.Logger.Redis.Key,
+		},
+	}
+
+	qc, err := quick.New(srvConfig)
+	fatalIf(err, "Unable to initialize the quick config.")
+	configFile, err := getConfigFile()
+	fatalIf(err, "Unable to get config file.")
+
+	err = qc.Save(configFile)
+	fatalIf(err, "Failed to migrate config from ‘"+cv5.Version+"’ to ‘"+srvConfig.Version+"’ failed.")
+
+	console.Println("Migration from version ‘" + cv5.Version + "’ to ‘" + srvConfig.Version + "’ completed successfully.")
+}
+
+// Version '6' to '7' migrates config, removes previous fields related
+// to backend types and server address. This change further simplifies
+// the config for future additions.
+func migrateV6ToV7() {
+	cv6, err := loadConfigV6()
+	if err != nil && os.IsNotExist(err) {
+		return
+	}
+	fatalIf(err, "Unable to load config version ‘6’.")
+	if cv6.Version != "6" {
+		return
+	}
+
+	// Save only the new fields, ignore the rest.
+	srvConfig := &serverConfigV7{}
+	srvConfig.Version = globalMinioConfigVersion
+	srvConfig.Credential = cv6.Credential
+	srvConfig.Region = cv6.Region
+	if srvConfig.Region == "" {
+		// Region needs to be set for AWS Signature Version 4.
+		srvConfig.Region = "us-east-1"
+	}
+	srvConfig.Logger.Console = cv6.Logger.Console
+	srvConfig.Logger.File = cv6.Logger.File
+	srvConfig.Logger.Syslog = cv6.Logger.Syslog
+	srvConfig.Notify.AMQP = make(map[string]amqpNotify)
+	srvConfig.Notify.ElasticSearch = make(map[string]elasticSearchNotify)
+	srvConfig.Notify.Redis = make(map[string]redisNotify)
+	if len(cv6.Notify.AMQP) == 0 {
+		srvConfig.Notify.AMQP["1"] = amqpNotify{}
+	} else {
+		srvConfig.Notify.AMQP = cv6.Notify.AMQP
+	}
+	if len(cv6.Notify.ElasticSearch) == 0 {
+		srvConfig.Notify.ElasticSearch["1"] = elasticSearchNotify{}
+	} else {
+		srvConfig.Notify.ElasticSearch = cv6.Notify.ElasticSearch
+	}
+	if len(cv6.Notify.Redis) == 0 {
+		srvConfig.Notify.Redis["1"] = redisNotify{}
+	} else {
+		srvConfig.Notify.Redis = cv6.Notify.Redis
+	}
+
+	qc, err := quick.New(srvConfig)
+	fatalIf(err, "Unable to initialize the quick config.")
+	configFile, err := getConfigFile()
+	fatalIf(err, "Unable to get config file.")
+
+	err = qc.Save(configFile)
+	fatalIf(err, "Failed to migrate config from ‘"+cv6.Version+"’ to ‘"+srvConfig.Version+"’ failed.")
+
+	console.Println("Migration from version ‘" + cv6.Version + "’ to ‘" + srvConfig.Version + "’ completed successfully.")
+}

cmd/config-old.go

@@ -0,0 +1,312 @@
+package cmd
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/minio/minio/pkg/quick"
+)
+
+/////////////////// Config V1 ///////////////////
+type configV1 struct {
+	Version         string `json:"version"`
+	AccessKeyID     string `json:"accessKeyId"`
+	SecretAccessKey string `json:"secretAccessKey"`
+}
+
+// loadConfigV1 load config
+func loadConfigV1() (*configV1, error) {
+	configPath, err := getConfigPath()
+	if err != nil {
+		return nil, err
+	}
+	configFile := filepath.Join(configPath, "fsUsers.json")
+	if _, err = os.Stat(configFile); err != nil {
+		return nil, err
+	}
+	c := &configV1{}
+	c.Version = "1"
+	qc, err := quick.New(c)
+	if err != nil {
+		return nil, err
+	}
+	if err := qc.Load(configFile); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+/////////////////// Config V2 ///////////////////
+type configV2 struct {
+	Version     string `json:"version"`
+	Credentials struct {
+		AccessKeyID     string `json:"accessKeyId"`
+		SecretAccessKey string `json:"secretAccessKey"`
+		Region          string `json:"region"`
+	} `json:"credentials"`
+	MongoLogger struct {
+		Addr       string `json:"addr"`
+		DB         string `json:"db"`
+		Collection string `json:"collection"`
+	} `json:"mongoLogger"`
+	SyslogLogger struct {
+		Network string `json:"network"`
+		Addr    string `json:"addr"`
+	} `json:"syslogLogger"`
+	FileLogger struct {
+		Filename string `json:"filename"`
+	} `json:"fileLogger"`
+}
+
+// loadConfigV2 load config version '2'.
+func loadConfigV2() (*configV2, error) {
+	configFile, err := getConfigFile()
+	if err != nil {
+		return nil, err
+	}
+	if _, err = os.Stat(configFile); err != nil {
+		return nil, err
+	}
+	c := &configV2{}
+	c.Version = "2"
+	qc, err := quick.New(c)
+	if err != nil {
+		return nil, err
+	}
+	if err := qc.Load(configFile); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+/////////////////// Config V3 ///////////////////
+
+// backendV3 type.
+type backendV3 struct {
+	Type  string   `json:"type"`
+	Disk  string   `json:"disk,omitempty"`
+	Disks []string `json:"disks,omitempty"`
+}
+
+// loggerV3 type.
+type loggerV3 struct {
+	Console struct {
+		Enable bool   `json:"enable"`
+		Level  string `json:"level"`
+	}
+	File struct {
+		Enable   bool   `json:"enable"`
+		Filename string `json:"fileName"`
+		Level    string `json:"level"`
+	}
+	Syslog struct {
+		Enable bool   `json:"enable"`
+		Addr   string `json:"address"`
+		Level  string `json:"level"`
+	} `json:"syslog"`
+	// Add new loggers here.
+}
+
+// configV3 server configuration version '3'.
+type configV3 struct {
+	Version string `json:"version"`
+
+	// Backend configuration.
+	Backend backendV3 `json:"backend"`
+
+	// http Server configuration.
+	Addr string `json:"address"`
+
+	// S3 API configuration.
+	Credential credential `json:"credential"`
+	Region     string     `json:"region"`
+
+	// Additional error logging configuration.
+	Logger loggerV3 `json:"logger"`
+}
+
+// loadConfigV3 load config version '3'.
+func loadConfigV3() (*configV3, error) {
+	configFile, err := getConfigFile()
+	if err != nil {
+		return nil, err
+	}
+	if _, err = os.Stat(configFile); err != nil {
+		return nil, err
+	}
+	c := &configV3{}
+	c.Version = "3"
+	qc, err := quick.New(c)
+	if err != nil {
+		return nil, err
+	}
+	if err := qc.Load(configFile); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+// logger type representing version '4' logger config.
+type loggerV4 struct {
+	Console struct {
+		Enable bool   `json:"enable"`
+		Level  string `json:"level"`
+	} `json:"console"`
+	File struct {
+		Enable   bool   `json:"enable"`
+		Filename string `json:"fileName"`
+		Level    string `json:"level"`
+	} `json:"file"`
+	Syslog struct {
+		Enable bool   `json:"enable"`
+		Addr   string `json:"address"`
+		Level  string `json:"level"`
+	} `json:"syslog"`
+}
+
+// configV4 server configuration version '4'.
+type configV4 struct {
+	Version string `json:"version"`
+
+	// S3 API configuration.
+	Credential credential `json:"credential"`
+	Region     string     `json:"region"`
+
+	// Additional error logging configuration.
+	Logger loggerV4 `json:"logger"`
+}
+
+// loadConfigV4 load config version '4'.
+func loadConfigV4() (*configV4, error) {
+	configFile, err := getConfigFile()
+	if err != nil {
+		return nil, err
+	}
+	if _, err = os.Stat(configFile); err != nil {
+		return nil, err
+	}
+	c := &configV4{}
+	c.Version = "4"
+	qc, err := quick.New(c)
+	if err != nil {
+		return nil, err
+	}
+	if err := qc.Load(configFile); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+// logger type representing version '5' logger config.
+type loggerV5 struct {
+	Console struct {
+		Enable bool   `json:"enable"`
+		Level  string `json:"level"`
+	} `json:"console"`
+	File struct {
+		Enable   bool   `json:"enable"`
+		Filename string `json:"fileName"`
+		Level    string `json:"level"`
+	} `json:"file"`
+	Syslog struct {
+		Enable bool   `json:"enable"`
+		Addr   string `json:"address"`
+		Level  string `json:"level"`
+	} `json:"syslog"`
+	AMQP struct {
+		Enable       bool   `json:"enable"`
+		Level        string `json:"level"`
+		URL          string `json:"url"`
+		Exchange     string `json:"exchange"`
+		RoutingKey   string `json:"routingKey"`
+		ExchangeType string `json:"exchangeType"`
+		Mandatory    bool   `json:"mandatory"`
+		Immediate    bool   `json:"immediate"`
+		Durable      bool   `json:"durable"`
+		Internal     bool   `json:"internal"`
+		NoWait       bool   `json:"noWait"`
+		AutoDeleted  bool   `json:"autoDeleted"`
+	} `json:"amqp"`
+	ElasticSearch struct {
+		Enable bool   `json:"enable"`
+		Level  string `json:"level"`
+		URL    string `json:"url"`
+		Index  string `json:"index"`
+	} `json:"elasticsearch"`
+	Redis struct {
+		Enable   bool   `json:"enable"`
+		Level    string `json:"level"`
+		Addr     string `json:"address"`
+		Password string `json:"password"`
+		Key      string `json:"key"`
+	} `json:"redis"`
+}
+
+// configV5 server configuration version '5'.
+type configV5 struct {
+	Version string `json:"version"`
+
+	// S3 API configuration.
+	Credential credential `json:"credential"`
+	Region     string     `json:"region"`
+
+	// Additional error logging configuration.
+	Logger loggerV5 `json:"logger"`
+}
+
+// loadConfigV5 load config version '5'.
+func loadConfigV5() (*configV5, error) {
+	configFile, err := getConfigFile()
+	if err != nil {
+		return nil, err
+	}
+	if _, err = os.Stat(configFile); err != nil {
+		return nil, err
+	}
+	c := &configV5{}
+	c.Version = "5"
+	qc, err := quick.New(c)
+	if err != nil {
+		return nil, err
+	}
+	if err := qc.Load(configFile); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+// configV6 server configuration version '6'.
+type configV6 struct {
+	Version string `json:"version"`
+
+	// S3 API configuration.
+	Credential credential `json:"credential"`
+	Region     string     `json:"region"`
+
+	// Additional error logging configuration.
+	Logger logger `json:"logger"`
+
+	// Notification queue configuration.
+	Notify notifier `json:"notify"`
+}
+
+// loadConfigV6 load config version '6'.
+func loadConfigV6() (*configV6, error) {
+	configFile, err := getConfigFile()
+	if err != nil {
+		return nil, err
+	}
+	if _, err = os.Stat(configFile); err != nil {
+		return nil, err
+	}
+	c := &configV6{}
+	c.Version = "6"
+	qc, err := quick.New(c)
+	if err != nil {
+		return nil, err
+	}
+	if err := qc.Load(configFile); err != nil {
+		return nil, err
+	}
+	return c, nil
+}

cmd/config-v7.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"os"
@@ -23,8 +23,8 @@ import (
 	"github.com/minio/minio/pkg/quick"
 )
 
-// serverConfigV4 server configuration version '4'.
-type serverConfigV4 struct {
+// serverConfigV7 server configuration version '7'.
+type serverConfigV7 struct {
 	Version string `json:"version"`
 
 	// S3 API configuration.
@@ -34,6 +34,9 @@ type serverConfigV4 struct {
 	// Additional error logging configuration.
 	Logger logger `json:"logger"`
 
+	// Notification queue configuration.
+	Notify notifier `json:"notify"`
+
 	// Read Write mutex.
 	rwMutex *sync.RWMutex
 }
@@ -41,28 +44,33 @@ type serverConfigV4 struct {
 // initConfig - initialize server config. config version (called only once).
 func initConfig() error {
 	if !isConfigFileExists() {
-		srvCfg := &serverConfigV4{}
+		// Initialize server config.
+		srvCfg := &serverConfigV7{}
 		srvCfg.Version = globalMinioConfigVersion
 		srvCfg.Region = "us-east-1"
 		srvCfg.Credential = mustGenAccessKeys()
+
 		// Enable console logger by default on a fresh run.
 		srvCfg.Logger.Console = consoleLogger{
 			Enable: true,
 			Level:  "fatal",
 		}
+
+		// Make sure to initialize notification configs.
+		srvCfg.Notify.AMQP = make(map[string]amqpNotify)
+		srvCfg.Notify.AMQP["1"] = amqpNotify{}
+		srvCfg.Notify.ElasticSearch = make(map[string]elasticSearchNotify)
+		srvCfg.Notify.ElasticSearch["1"] = elasticSearchNotify{}
+		srvCfg.Notify.Redis = make(map[string]redisNotify)
+		srvCfg.Notify.Redis["1"] = redisNotify{}
 		srvCfg.rwMutex = &sync.RWMutex{}
+
 		// Create config path.
 		err := createConfigPath()
 		if err != nil {
 			return err
 		}
 
-		// Create certs path.
-		err = createCertsPath()
-		if err != nil {
-			return err
-		}
-
 		// Save the new config globally.
 		serverConfig = srvCfg
 
@@ -76,7 +84,7 @@ func initConfig() error {
 	if _, err = os.Stat(configFile); err != nil {
 		return err
 	}
-	srvCfg := &serverConfigV4{}
+	srvCfg := &serverConfigV7{}
 	srvCfg.Version = globalMinioConfigVersion
 	srvCfg.rwMutex = &sync.RWMutex{}
 	qc, err := quick.New(srvCfg)
@@ -90,14 +98,15 @@ func initConfig() error {
 	serverConfig = srvCfg
 	// Set the version properly after the unmarshalled json is loaded.
 	serverConfig.Version = globalMinioConfigVersion
+
 	return nil
 }
 
 // serverConfig server config.
-var serverConfig *serverConfigV4
+var serverConfig *serverConfigV7
 
 // GetVersion get current config version.
-func (s serverConfigV4) GetVersion() string {
+func (s serverConfigV7) GetVersion() string {
 	s.rwMutex.RLock()
 	defer s.rwMutex.RUnlock()
 	return s.Version
@@ -105,78 +114,135 @@ func (s serverConfigV4) GetVersion() string {
 
 /// Logger related.
 
+func (s *serverConfigV7) SetAMQPNotifyByID(accountID string, amqpn amqpNotify) {
+	s.rwMutex.Lock()
+	defer s.rwMutex.Unlock()
+	s.Notify.AMQP[accountID] = amqpn
+}
+
+func (s serverConfigV7) GetAMQP() map[string]amqpNotify {
+	s.rwMutex.RLock()
+	defer s.rwMutex.RUnlock()
+	return s.Notify.AMQP
+}
+
+// GetAMQPNotify get current AMQP logger.
+func (s serverConfigV7) GetAMQPNotifyByID(accountID string) amqpNotify {
+	s.rwMutex.RLock()
+	defer s.rwMutex.RUnlock()
+	return s.Notify.AMQP[accountID]
+}
+
+func (s *serverConfigV7) SetElasticSearchNotifyByID(accountID string, esNotify elasticSearchNotify) {
+	s.rwMutex.Lock()
+	defer s.rwMutex.Unlock()
+	s.Notify.ElasticSearch[accountID] = esNotify
+}
+
+func (s serverConfigV7) GetElasticSearch() map[string]elasticSearchNotify {
+	s.rwMutex.RLock()
+	defer s.rwMutex.RUnlock()
+	return s.Notify.ElasticSearch
+}
+
+// GetElasticSearchNotify get current ElasicSearch logger.
+func (s serverConfigV7) GetElasticSearchNotifyByID(accountID string) elasticSearchNotify {
+	s.rwMutex.RLock()
+	defer s.rwMutex.RUnlock()
+	return s.Notify.ElasticSearch[accountID]
+}
+
+func (s *serverConfigV7) SetRedisNotifyByID(accountID string, rNotify redisNotify) {
+	s.rwMutex.Lock()
+	defer s.rwMutex.Unlock()
+	s.Notify.Redis[accountID] = rNotify
+}
+
+func (s serverConfigV7) GetRedis() map[string]redisNotify {
+	s.rwMutex.RLock()
+	defer s.rwMutex.RUnlock()
+	return s.Notify.Redis
+}
+
+// GetRedisNotify get current Redis logger.
+func (s serverConfigV7) GetRedisNotifyByID(accountID string) redisNotify {
+	s.rwMutex.RLock()
+	defer s.rwMutex.RUnlock()
+	return s.Notify.Redis[accountID]
+}
+
 // SetFileLogger set new file logger.
-func (s *serverConfigV4) SetFileLogger(flogger fileLogger) {
+func (s *serverConfigV7) SetFileLogger(flogger fileLogger) {
 	s.rwMutex.Lock()
 	defer s.rwMutex.Unlock()
 	s.Logger.File = flogger
 }
 
 // GetFileLogger get current file logger.
-func (s serverConfigV4) GetFileLogger() fileLogger {
+func (s serverConfigV7) GetFileLogger() fileLogger {
 	s.rwMutex.RLock()
 	defer s.rwMutex.RUnlock()
 	return s.Logger.File
 }
 
 // SetConsoleLogger set new console logger.
-func (s *serverConfigV4) SetConsoleLogger(clogger consoleLogger) {
+func (s *serverConfigV7) SetConsoleLogger(clogger consoleLogger) {
 	s.rwMutex.Lock()
 	defer s.rwMutex.Unlock()
 	s.Logger.Console = clogger
 }
 
 // GetConsoleLogger get current console logger.
-func (s serverConfigV4) GetConsoleLogger() consoleLogger {
+func (s serverConfigV7) GetConsoleLogger() consoleLogger {
 	s.rwMutex.RLock()
 	defer s.rwMutex.RUnlock()
 	return s.Logger.Console
 }
 
 // SetSyslogLogger set new syslog logger.
-func (s *serverConfigV4) SetSyslogLogger(slogger syslogLogger) {
+func (s *serverConfigV7) SetSyslogLogger(slogger syslogLogger) {
 	s.rwMutex.Lock()
 	defer s.rwMutex.Unlock()
 	s.Logger.Syslog = slogger
 }
 
 // GetSyslogLogger get current syslog logger.
-func (s *serverConfigV4) GetSyslogLogger() syslogLogger {
+func (s *serverConfigV7) GetSyslogLogger() syslogLogger {
 	s.rwMutex.RLock()
 	defer s.rwMutex.RUnlock()
 	return s.Logger.Syslog
 }
 
 // SetRegion set new region.
-func (s *serverConfigV4) SetRegion(region string) {
+func (s *serverConfigV7) SetRegion(region string) {
 	s.rwMutex.Lock()
 	defer s.rwMutex.Unlock()
 	s.Region = region
 }
 
 // GetRegion get current region.
-func (s serverConfigV4) GetRegion() string {
+func (s serverConfigV7) GetRegion() string {
 	s.rwMutex.RLock()
 	defer s.rwMutex.RUnlock()
 	return s.Region
 }
 
 // SetCredentials set new credentials.
-func (s *serverConfigV4) SetCredential(creds credential) {
+func (s *serverConfigV7) SetCredential(creds credential) {
 	s.rwMutex.Lock()
 	defer s.rwMutex.Unlock()
 	s.Credential = creds
 }
 
 // GetCredentials get current credentials.
-func (s serverConfigV4) GetCredential() credential {
+func (s serverConfigV7) GetCredential() credential {
 	s.rwMutex.RLock()
 	defer s.rwMutex.RUnlock()
 	return s.Credential
 }
 
 // Save config.
-func (s serverConfigV4) Save() error {
+func (s serverConfigV7) Save() error {
 	s.rwMutex.RLock()
 	defer s.rwMutex.RUnlock()
 

cmd/config-v7_test.go

@@ -0,0 +1,107 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"reflect"
+	"testing"
+)
+
+func TestServerConfig(t *testing.T) {
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+	// remove the root folder after the test ends.
+	defer removeAll(rootPath)
+
+	if serverConfig.GetRegion() != "us-east-1" {
+		t.Errorf("Expecting region `us-east-1` found %s", serverConfig.GetRegion())
+	}
+
+	// Set new region and verify.
+	serverConfig.SetRegion("us-west-1")
+	if serverConfig.GetRegion() != "us-west-1" {
+		t.Errorf("Expecting region `us-west-1` found %s", serverConfig.GetRegion())
+	}
+
+	// Set new amqp notification id.
+	serverConfig.SetAMQPNotifyByID("2", amqpNotify{})
+	savedNotifyCfg1 := serverConfig.GetAMQPNotifyByID("2")
+	if !reflect.DeepEqual(savedNotifyCfg1, amqpNotify{}) {
+		t.Errorf("Expecting AMQP config %#v found %#v", amqpNotify{}, savedNotifyCfg1)
+	}
+
+	// Set new elastic search notification id.
+	serverConfig.SetElasticSearchNotifyByID("2", elasticSearchNotify{})
+	savedNotifyCfg2 := serverConfig.GetElasticSearchNotifyByID("2")
+	if !reflect.DeepEqual(savedNotifyCfg2, elasticSearchNotify{}) {
+		t.Errorf("Expecting Elasticsearch config %#v found %#v", elasticSearchNotify{}, savedNotifyCfg2)
+	}
+
+	// Set new redis notification id.
+	serverConfig.SetRedisNotifyByID("2", redisNotify{})
+	savedNotifyCfg3 := serverConfig.GetRedisNotifyByID("2")
+	if !reflect.DeepEqual(savedNotifyCfg3, redisNotify{}) {
+		t.Errorf("Expecting Redis config %#v found %#v", redisNotify{}, savedNotifyCfg3)
+	}
+
+	// Set new console logger.
+	serverConfig.SetConsoleLogger(consoleLogger{
+		Enable: true,
+	})
+	consoleCfg := serverConfig.GetConsoleLogger()
+	if !reflect.DeepEqual(consoleCfg, consoleLogger{Enable: true}) {
+		t.Errorf("Expecting console logger config %#v found %#v", consoleLogger{Enable: true}, consoleCfg)
+	}
+
+	// Set new file logger.
+	serverConfig.SetFileLogger(fileLogger{
+		Enable: true,
+	})
+	fileCfg := serverConfig.GetFileLogger()
+	if !reflect.DeepEqual(fileCfg, fileLogger{Enable: true}) {
+		t.Errorf("Expecting file logger config %#v found %#v", fileLogger{Enable: true}, consoleCfg)
+	}
+
+	// Set new syslog logger.
+	serverConfig.SetSyslogLogger(syslogLogger{
+		Enable: true,
+	})
+	sysLogCfg := serverConfig.GetSyslogLogger()
+	if !reflect.DeepEqual(sysLogCfg, syslogLogger{Enable: true}) {
+		t.Errorf("Expecting syslog logger config %#v found %#v", syslogLogger{Enable: true}, sysLogCfg)
+	}
+
+	// Match version.
+	if serverConfig.GetVersion() != globalMinioConfigVersion {
+		t.Errorf("Expecting version %s found %s", serverConfig.GetVersion(), globalMinioConfigVersion)
+	}
+
+	// Attempt to save.
+	if err := serverConfig.Save(); err != nil {
+		t.Fatalf("Unable to save updated config file %s", err)
+	}
+
+	// Do this only once here.
+	setGlobalConfigPath(rootPath)
+
+	// Initialize server config.
+	if err := initConfig(); err != nil {
+		t.Fatalf("Unable to initialize from updated config file %s", err)
+	}
+}

cmd/config.go

@@ -14,25 +14,32 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"os"
 	"path/filepath"
+	"sync"
 
 	"github.com/minio/go-homedir"
 )
 
 // configPath for custom config path only for testing purposes
 var customConfigPath string
+var configMu sync.Mutex
 
 // Sets a new config path.
 func setGlobalConfigPath(configPath string) {
+	configMu.Lock()
+	defer configMu.Unlock()
 	customConfigPath = configPath
 }
 
 // getConfigPath get server config path
 func getConfigPath() (string, error) {
+	configMu.Lock()
+	defer configMu.Unlock()
+
 	if customConfigPath != "" {
 		return customConfigPath, nil
 	}

cmd/control-heal-main.go

@@ -0,0 +1,120 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"fmt"
+	"net/rpc"
+	"net/url"
+	"path"
+	"strings"
+
+	"github.com/minio/cli"
+)
+
+var healCmd = cli.Command{
+	Name:   "heal",
+	Usage:  "To heal objects.",
+	Action: healControl,
+	CustomHelpTemplate: `NAME:
+  minio control {{.Name}} - {{.Usage}}
+
+USAGE:
+  minio control {{.Name}}
+
+EAMPLES:
+  1. Heal an object.
+     $ minio control {{.Name}} http://localhost:9000/songs/classical/western/piano.mp3
+
+  2. Heal all objects in a bucket recursively.
+     $ minio control {{.Name}}  http://localhost:9000/songs
+
+  3. Heall all objects with a given prefix recursively.
+     $ minio control {{.Name}} http://localhost:9000/songs/classical/
+`,
+}
+
+// "minio control heal" entry point.
+func healControl(ctx *cli.Context) {
+	// Parse bucket and object from url.URL.Path
+	parseBucketObject := func(path string) (bucketName string, objectName string) {
+		splits := strings.SplitN(path, string(slashSeparator), 3)
+		switch len(splits) {
+		case 0, 1:
+			bucketName = ""
+			objectName = ""
+		case 2:
+			bucketName = splits[1]
+			objectName = ""
+		case 3:
+			bucketName = splits[1]
+			objectName = splits[2]
+
+		}
+		return bucketName, objectName
+	}
+
+	if len(ctx.Args()) != 1 {
+		cli.ShowCommandHelpAndExit(ctx, "heal", 1)
+	}
+
+	parsedURL, err := url.Parse(ctx.Args()[0])
+	fatalIf(err, "Unable to parse URL")
+
+	bucketName, objectName := parseBucketObject(parsedURL.Path)
+	if bucketName == "" {
+		cli.ShowCommandHelpAndExit(ctx, "heal", 1)
+	}
+
+	client, err := rpc.DialHTTPPath("tcp", parsedURL.Host, path.Join(reservedBucket, controlPath))
+	fatalIf(err, "Unable to connect to %s", parsedURL.Host)
+
+	// If object does not have trailing "/" then it's an object, hence heal it.
+	if objectName != "" && !strings.HasSuffix(objectName, slashSeparator) {
+		fmt.Printf("Healing : /%s/%s", bucketName, objectName)
+		args := &HealObjectArgs{bucketName, objectName}
+		reply := &HealObjectReply{}
+		err = client.Call("Control.HealObject", args, reply)
+		fatalIf(err, "RPC Control.HealObject call failed")
+		fmt.Println()
+		return
+	}
+
+	// Recursively list and heal the objects.
+	prefix := objectName
+	marker := ""
+	for {
+		args := HealListArgs{bucketName, prefix, marker, "", 1000}
+		reply := &HealListReply{}
+		err = client.Call("Control.ListObjectsHeal", args, reply)
+		fatalIf(err, "RPC Heal.ListObjects call failed")
+
+		// Heal the objects returned in the ListObjects reply.
+		for _, obj := range reply.Objects {
+			fmt.Printf("Healing : /%s/%s", bucketName, obj)
+			reply := &HealObjectReply{}
+			err = client.Call("Control.HealObject", HealObjectArgs{bucketName, obj}, reply)
+			fatalIf(err, "RPC Heal.HealObject call failed")
+			fmt.Println()
+		}
+		if !reply.IsTruncated {
+			// End of listing.
+			break
+		}
+		marker = reply.NextMarker
+	}
+}

cmd/control-main.go

@@ -0,0 +1,52 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "github.com/minio/cli"
+
+// "minio control" command.
+var controlCmd = cli.Command{
+	Name:   "control",
+	Usage:  "Control and manage minio server.",
+	Action: mainControl,
+	Subcommands: []cli.Command{
+		healCmd,
+		shutdownCmd,
+	},
+	CustomHelpTemplate: `NAME:
+   {{.Name}} - {{.Usage}}
+
+USAGE:
+   {{.Name}} [FLAGS] COMMAND
+
+FLAGS:
+  {{range .Flags}}{{.}}
+  {{end}}
+COMMANDS:
+   {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
+   {{end}}
+`,
+}
+
+func mainControl(ctx *cli.Context) {
+	if ctx.Args().First() != "" { // command help.
+		cli.ShowCommandHelp(ctx, ctx.Args().First())
+	} else {
+		// command with Subcommands is an App.
+		cli.ShowAppHelp(ctx)
+	}
+}

cmd/control-shutdown-main.go

@@ -0,0 +1,68 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"net/rpc"
+	"net/url"
+	"path"
+
+	"github.com/minio/cli"
+)
+
+var shutdownCmd = cli.Command{
+	Name:   "shutdown",
+	Usage:  "Shutdown or restart the server.",
+	Action: shutdownControl,
+	Flags: []cli.Flag{
+		cli.BoolFlag{
+			Name:  "restart",
+			Usage: "Restart the server.",
+		},
+	},
+	CustomHelpTemplate: `NAME:
+  minio control {{.Name}} - {{.Usage}}
+
+USAGE:
+  minio control {{.Name}} http://localhost:9000/
+
+EAMPLES:
+  1. Shutdown the server:
+    $ minio control shutdown http://localhost:9000/
+
+  2. Reboot the server:
+    $ minio control shutdown --restart http://localhost:9000/
+`,
+}
+
+// "minio control shutdown" entry point.
+func shutdownControl(c *cli.Context) {
+	if len(c.Args()) != 1 {
+		cli.ShowCommandHelpAndExit(c, "shutdown", 1)
+	}
+
+	parsedURL, err := url.ParseRequestURI(c.Args()[0])
+	fatalIf(err, "Unable to parse URL")
+
+	client, err := rpc.DialHTTPPath("tcp", parsedURL.Host, path.Join(reservedBucket, controlPath))
+	fatalIf(err, "Unable to connect to %s", parsedURL.Host)
+
+	args := &ShutdownArgs{Reboot: c.Bool("restart")}
+	reply := &ShutdownReply{}
+	err = client.Call("Control.Shutdown", args, reply)
+	fatalIf(err, "RPC Control.Shutdown call failed")
+}

cmd/controller-handlers.go

@@ -0,0 +1,88 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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
+
+// HealListArgs - argument for ListObjects RPC.
+type HealListArgs struct {
+	Bucket    string
+	Prefix    string
+	Marker    string
+	Delimiter string
+	MaxKeys   int
+}
+
+// HealListReply - reply by ListObjects RPC.
+type HealListReply struct {
+	IsTruncated bool
+	NextMarker  string
+	Objects     []string
+}
+
+// ListObjects - list all objects that needs healing.
+func (c *controllerAPIHandlers) ListObjectsHeal(arg *HealListArgs, reply *HealListReply) error {
+	objAPI := c.ObjectAPI
+	if objAPI == nil {
+		return errInvalidArgument
+	}
+	info, err := objAPI.ListObjectsHeal(arg.Bucket, arg.Prefix, arg.Marker, arg.Delimiter, arg.MaxKeys)
+	if err != nil {
+		return err
+	}
+	reply.IsTruncated = info.IsTruncated
+	reply.NextMarker = info.NextMarker
+	for _, obj := range info.Objects {
+		reply.Objects = append(reply.Objects, obj.Name)
+	}
+	return nil
+}
+
+// HealObjectArgs - argument for HealObject RPC.
+type HealObjectArgs struct {
+	Bucket string
+	Object string
+}
+
+// HealObjectReply - reply by HealObject RPC.
+type HealObjectReply struct{}
+
+// HealObject - heal the object.
+func (c *controllerAPIHandlers) HealObject(arg *HealObjectArgs, reply *HealObjectReply) error {
+	objAPI := c.ObjectAPI
+	if objAPI == nil {
+		return errInvalidArgument
+	}
+	return objAPI.HealObject(arg.Bucket, arg.Object)
+}
+
+// ShutdownArgs - argument for Shutdown RPC.
+type ShutdownArgs struct {
+	Reboot bool
+}
+
+// ShutdownReply - reply by Shutdown RPC.
+type ShutdownReply struct{}
+
+// Shutdown - Shutdown the server.
+
+func (c *controllerAPIHandlers) Shutdown(arg *ShutdownArgs, reply *ShutdownReply) error {
+	if arg.Reboot {
+		globalShutdownSignalCh <- shutdownRestart
+	} else {
+		globalShutdownSignalCh <- shutdownHalt
+	}
+	return nil
+}

cmd/controller-router.go

@@ -0,0 +1,42 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"net/rpc"
+
+	router "github.com/gorilla/mux"
+)
+
+// Routes paths for "minio control" commands.
+const (
+	controlPath = "/controller"
+)
+
+// Register control RPC handlers.
+func registerControlRPCRouter(mux *router.Router, ctrlHandlers *controllerAPIHandlers) {
+	ctrlRPCServer := rpc.NewServer()
+	ctrlRPCServer.RegisterName("Control", ctrlHandlers)
+
+	ctrlRouter := mux.NewRoute().PathPrefix(reservedBucket).Subrouter()
+	ctrlRouter.Path(controlPath).Handler(ctrlRPCServer)
+}
+
+// Handler for object healing.
+type controllerAPIHandlers struct {
+	ObjectAPI ObjectLayer
+}

cmd/crossdomain-xml-handler.go

@@ -0,0 +1,49 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "net/http"
+
+// Standard cross domain policy information located at https://s3.amazonaws.com/crossdomain.xml
+var crossDomainXML = `<?xml version="1.0"?><!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd"><cross-domain-policy><allow-access-from domain="*" secure="false" /></cross-domain-policy>`
+
+// Cross domain policy implements http.Handler interface, implementing a custom ServerHTTP.
+type crossDomainPolicy struct {
+	handler http.Handler
+}
+
+// A cross-domain policy file is an XML document that grants a web client, such as Adobe Flash Player
+// or Adobe Acrobat (though not necessarily limited to these), permission to handle data across domains.
+// When clients request content hosted on a particular source domain and that content make requests
+// directed towards a domain other than its own, the remote domain needs to host a cross-domain
+// policy file that grants access to the source domain, allowing the client to continue the transaction.
+func setCrossDomainPolicy(h http.Handler) http.Handler {
+	return crossDomainPolicy{handler: h}
+}
+
+func (c crossDomainPolicy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Look for 'crossdomain.xml' in the incoming request.
+	switch r.URL.Path {
+	case "/crossdomain.xml":
+		// Write the standard cross domain policy xml.
+		w.Write([]byte(crossDomainXML))
+		// Request completed, no need to serve to other handlers.
+		return
+	}
+	// Continue to serve the request further.
+	c.handler.ServeHTTP(w, r)
+}

cmd/damerau-levenshtein.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"math"

cmd/damerau-levenshtein_test.go

@@ -0,0 +1,66 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"math"
+	"testing"
+)
+
+// Test minimum function which calculates the minimal value in a list of integers
+func TestMinimum(t *testing.T) {
+	type testCase struct {
+		listval  []int
+		expected int
+		pass     bool
+	}
+	testCases := []testCase{
+		{listval: []int{3, 4, 15}, expected: 3},
+		{listval: []int{}, expected: math.MaxInt32},
+	}
+	// Validate all the test cases.
+	for i, tt := range testCases {
+		val := minimum(tt.listval)
+		if val != tt.expected {
+			t.Errorf("Test %d:, Expected %d, got %d", i+1, tt.expected, val)
+		}
+	}
+}
+
+// Test DamerauLevenshtein which calculates the difference distance between two words
+func TestDamerauLevenshtein(t *testing.T) {
+	type testCase struct {
+		word1    string
+		word2    string
+		distance int
+	}
+	testCases := []testCase{
+		{word1: "", word2: "", distance: 0},
+		{word1: "a", word2: "a", distance: 0},
+		{word1: "a", word2: "b", distance: 1},
+		{word1: "rm", word2: "tm", distance: 1},
+		{word1: "version", word2: "evrsion", distance: 1},
+		{word1: "version", word2: "bersio", distance: 2},
+	}
+	// Validate all the test cases.
+	for i, tt := range testCases {
+		d := DamerauLevenshteinDistance(tt.word1, tt.word2)
+		if d != tt.distance {
+			t.Errorf("Test %d:, Expected %d, got %d", i+1, tt.distance, d)
+		}
+	}
+}

cmd/erasure-createfile.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"encoding/hex"
@@ -28,60 +28,59 @@ import (
 // erasureCreateFile - writes an entire stream by erasure coding to
 // all the disks, writes also calculate individual block's checksum
 // for future bit-rot protection.
-func erasureCreateFile(disks []StorageAPI, volume string, path string, partName string, data io.Reader, eInfos []erasureInfo) (newEInfos []erasureInfo, size int64, err error) {
+func erasureCreateFile(disks []StorageAPI, volume, path string, reader io.Reader, blockSize int64, dataBlocks int, parityBlocks int, algo string, writeQuorum int) (bytesWritten int64, checkSums []string, err error) {
 	// Allocated blockSized buffer for reading.
-	buf := make([]byte, blockSizeV1)
-	hashWriters := newHashWriters(len(disks))
+	buf := make([]byte, blockSize)
 
-	// Just pick one eInfo.
-	eInfo := pickValidErasureInfo(eInfos)
+	hashWriters := newHashWriters(len(disks), algo)
 
 	// Read until io.EOF, erasure codes data and writes to all disks.
 	for {
-		var n int
-		n, err = io.ReadFull(data, buf)
-		if err == io.EOF {
+		var blocks [][]byte
+		n, rErr := io.ReadFull(reader, buf)
+		// FIXME: this is a bug in Golang, n == 0 and err ==
+		// io.ErrUnexpectedEOF for io.ReadFull function.
+		if n == 0 && rErr == io.ErrUnexpectedEOF {
+			return 0, nil, rErr
+		}
+		if rErr == io.EOF {
+			// We have reached EOF on the first byte read, io.Reader
+			// must be 0bytes, we don't need to erasure code
+			// data. Will create a 0byte file instead.
+			if bytesWritten == 0 {
+				blocks = make([][]byte, len(disks))
+				rErr = appendFile(disks, volume, path, blocks, hashWriters, writeQuorum)
+				if rErr != nil {
+					return 0, nil, rErr
+				}
+			} // else we have reached EOF after few reads, no need to
+			// add an additional 0bytes at the end.
 			break
 		}
-		if err != nil && err != io.ErrUnexpectedEOF {
-			return nil, 0, err
+		if rErr != nil && rErr != io.ErrUnexpectedEOF {
+			return 0, nil, rErr
 		}
-		size += int64(n)
-		var blocks [][]byte
-		// Returns encoded blocks.
-		blocks, err = encodeData(buf[:n], eInfo.DataBlocks, eInfo.ParityBlocks)
-		if err != nil {
-			return nil, 0, err
-		}
-		err = appendFile(disks, volume, path, blocks, eInfo.Distribution, hashWriters)
-		if err != nil {
-			return nil, 0, err
+		if n > 0 {
+			// Returns encoded blocks.
+			var enErr error
+			blocks, enErr = encodeData(buf[0:n], dataBlocks, parityBlocks)
+			if enErr != nil {
+				return 0, nil, enErr
+			}
+
+			// Write to all disks.
+			if err = appendFile(disks, volume, path, blocks, hashWriters, writeQuorum); err != nil {
+				return 0, nil, err
+			}
+			bytesWritten += int64(n)
 		}
 	}
 
-	// Save the checksums.
-	checkSums := make([]checkSumInfo, len(disks))
-	for index := range disks {
-		blockIndex := eInfo.Distribution[index] - 1
-		checkSums[blockIndex] = checkSumInfo{
-			Name:      partName,
-			Algorithm: "sha512",
-			Hash:      hex.EncodeToString(hashWriters[blockIndex].Sum(nil)),
-		}
+	checkSums = make([]string, len(disks))
+	for i := range checkSums {
+		checkSums[i] = hex.EncodeToString(hashWriters[i].Sum(nil))
 	}
-
-	// Erasure info update for checksum for each disks.
-	newEInfos = make([]erasureInfo, len(disks))
-	for index, eInfo := range eInfos {
-		if eInfo.IsValid() {
-			blockIndex := eInfo.Distribution[index] - 1
-			newEInfos[index] = eInfo
-			newEInfos[index].Checksum = append(newEInfos[index].Checksum, checkSums[blockIndex])
-		}
-	}
-
-	// Return newEInfos.
-	return newEInfos, size, nil
+	return bytesWritten, checkSums, nil
 }
 
 // encodeData - encodes incoming data buffer into
@@ -109,7 +108,7 @@ func encodeData(dataBuffer []byte, dataBlocks, parityBlocks int) ([][]byte, erro
 }
 
 // appendFile - append data buffer at path.
-func appendFile(disks []StorageAPI, volume, path string, enBlocks [][]byte, distribution []int, hashWriters []hash.Hash) (err error) {
+func appendFile(disks []StorageAPI, volume, path string, enBlocks [][]byte, hashWriters []hash.Hash, writeQuorum int) (err error) {
 	var wg = &sync.WaitGroup{}
 	var wErrs = make([]error, len(disks))
 	// Write encoded data to quorum disks in parallel.
@@ -121,20 +120,14 @@ func appendFile(disks []StorageAPI, volume, path string, enBlocks [][]byte, dist
 		// Write encoded data in routine.
 		go func(index int, disk StorageAPI) {
 			defer wg.Done()
-			// Pick the block from the distribution.
-			blockIndex := distribution[index] - 1
-			n, wErr := disk.AppendFile(volume, path, enBlocks[blockIndex])
+			wErr := disk.AppendFile(volume, path, enBlocks[index])
 			if wErr != nil {
 				wErrs[index] = wErr
 				return
 			}
-			if n != int64(len(enBlocks[blockIndex])) {
-				wErrs[index] = errUnexpected
-				return
-			}
 
 			// Calculate hash for each blocks.
-			hashWriters[blockIndex].Write(enBlocks[blockIndex])
+			hashWriters[index].Write(enBlocks[index])
 
 			// Successfully wrote.
 			wErrs[index] = nil
@@ -144,6 +137,9 @@ func appendFile(disks []StorageAPI, volume, path string, enBlocks [][]byte, dist
 	// Wait for all the appends to finish.
 	wg.Wait()
 
-	// Return success.
+	// Do we have write quorum?.
+	if !isDiskQuorum(wErrs, writeQuorum) {
+		return errXLWriteQuorum
+	}
 	return nil
 }

cmd/erasure-createfile_test.go

@@ -0,0 +1,203 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"crypto/rand"
+	"testing"
+
+	"github.com/klauspost/reedsolomon"
+)
+
+// Simulates a faulty disk for AppendFile()
+type AppendDiskDown struct {
+	*posix
+}
+
+func (a AppendDiskDown) AppendFile(volume string, path string, buf []byte) error {
+	return errFaultyDisk
+}
+
+// Test erasureCreateFile()
+func TestErasureCreateFile(t *testing.T) {
+	// Initialize environment needed for the test.
+	dataBlocks := 7
+	parityBlocks := 7
+	blockSize := int64(blockSizeV1)
+	setup, err := newErasureTestSetup(dataBlocks, parityBlocks, blockSize)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer setup.Remove()
+
+	disks := setup.disks
+
+	// Prepare a slice of 1MB with random data.
+	data := make([]byte, 1*1024*1024)
+	_, err = rand.Read(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Test when all disks are up.
+	size, _, err := erasureCreateFile(disks, "testbucket", "testobject1", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != int64(len(data)) {
+		t.Errorf("erasureCreateFile returned %d, expected %d", size, len(data))
+	}
+
+	// 2 disks down.
+	disks[4] = AppendDiskDown{disks[4].(*posix)}
+	disks[5] = AppendDiskDown{disks[5].(*posix)}
+
+	// Test when two disks are down.
+	size, _, err = erasureCreateFile(disks, "testbucket", "testobject2", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != int64(len(data)) {
+		t.Errorf("erasureCreateFile returned %d, expected %d", size, len(data))
+	}
+
+	// 4 more disks down. 6 disks down in total.
+	disks[6] = AppendDiskDown{disks[6].(*posix)}
+	disks[7] = AppendDiskDown{disks[7].(*posix)}
+	disks[8] = AppendDiskDown{disks[8].(*posix)}
+	disks[9] = AppendDiskDown{disks[9].(*posix)}
+
+	size, _, err = erasureCreateFile(disks, "testbucket", "testobject3", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != int64(len(data)) {
+		t.Errorf("erasureCreateFile returned %d, expected %d", size, len(data))
+	}
+
+	// 1 more disk down. 7 disk down in total. Should return quorum error.
+	disks[10] = AppendDiskDown{disks[10].(*posix)}
+	_, _, err = erasureCreateFile(disks, "testbucket", "testobject4", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != errXLWriteQuorum {
+		t.Errorf("erasureCreateFile returned expected errXLWriteQuorum error, got %s", err)
+	}
+}
+
+// TestErasureEncode checks for encoding for different data sets.
+func TestErasureEncode(t *testing.T) {
+	// Collection of cases for encode cases.
+	testEncodeCases := []struct {
+		inputData         []byte
+		inputDataBlocks   int
+		inputParityBlocks int
+
+		shouldPass  bool
+		expectedErr error
+	}{
+		// TestCase - 1.
+		// Regular data encoded.
+		{
+			[]byte("Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum."),
+			8,
+			8,
+			true,
+			nil,
+		},
+		// TestCase - 2.
+		// Empty data errors out.
+		{
+			[]byte(""),
+			8,
+			8,
+			false,
+			reedsolomon.ErrShortData,
+		},
+		// TestCase - 3.
+		// Single byte encoded.
+		{
+			[]byte("1"),
+			4,
+			4,
+			true,
+			nil,
+		},
+		// TestCase - 4.
+		// test case with negative data block.
+		{
+			[]byte("1"),
+			-1,
+			8,
+			false,
+			reedsolomon.ErrInvShardNum,
+		},
+		// TestCase - 5.
+		// test case with negative parity block.
+		{
+			[]byte("1"),
+			8,
+			-1,
+			false,
+			reedsolomon.ErrInvShardNum,
+		},
+		// TestCase - 6.
+		// test case with zero data block.
+		{
+			[]byte("1"),
+			0,
+			8,
+			false,
+			reedsolomon.ErrInvShardNum,
+		},
+		// TestCase - 7.
+		// test case with zero parity block.
+		{
+			[]byte("1"),
+			8,
+			0,
+			false,
+			reedsolomon.ErrInvShardNum,
+		},
+		// TestCase - 8.
+		// test case with data + parity blocks > 255.
+		// expected to fail with Error Max Shard number.
+		{
+			[]byte("1"),
+			128,
+			128,
+			false,
+			reedsolomon.ErrMaxShardNum,
+		},
+	}
+
+	// Test encode cases.
+	for i, testCase := range testEncodeCases {
+		_, actualErr := encodeData(testCase.inputData, testCase.inputDataBlocks, testCase.inputParityBlocks)
+		if actualErr != nil && testCase.shouldPass {
+			t.Errorf("Test %d: Expected to pass but failed instead with \"%s\"", i+1, actualErr)
+		}
+		if actualErr == nil && !testCase.shouldPass {
+			t.Errorf("Test %d: Expected to fail with error <Error> \"%v\", but instead passed", i+1, testCase.expectedErr)
+		}
+		// Failed as expected, but does it fail for the expected reason.
+		if actualErr != nil && !testCase.shouldPass {
+			if testCase.expectedErr != actualErr {
+				t.Errorf("Test %d: Expected Error to be \"%v\", but instead found \"%v\" ", i+1, testCase.expectedErr, actualErr)
+			}
+		}
+	}
+}

cmd/erasure-healfile.go

@@ -0,0 +1,84 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "encoding/hex"
+
+// Heals the erasure coded file. reedsolomon.Reconstruct() is used to reconstruct the missing parts.
+func erasureHealFile(latestDisks []StorageAPI, outDatedDisks []StorageAPI, volume, path, healBucket, healPath string, size int64, blockSize int64, dataBlocks int, parityBlocks int, algo string) (checkSums []string, err error) {
+	var offset int64
+	remainingSize := size
+
+	// Hash for bitrot protection.
+	hashWriters := newHashWriters(len(outDatedDisks), bitRotAlgo)
+
+	for remainingSize > 0 {
+		curBlockSize := blockSize
+		if remainingSize < curBlockSize {
+			curBlockSize = remainingSize
+		}
+
+		// Calculate the block size that needs to be read from each disk.
+		curEncBlockSize := getChunkSize(curBlockSize, dataBlocks)
+
+		// Memory for reading data from disks and reconstructing missing data using erasure coding.
+		enBlocks := make([][]byte, len(latestDisks))
+
+		// Read data from the latest disks.
+		// FIXME: no need to read from all the disks. dataBlocks+1 is enough.
+		for index, disk := range latestDisks {
+			if disk == nil {
+				continue
+			}
+			enBlocks[index] = make([]byte, curEncBlockSize)
+			_, err := disk.ReadFile(volume, path, offset, enBlocks[index])
+			if err != nil {
+				enBlocks[index] = nil
+			}
+		}
+
+		// Reconstruct missing data.
+		err := decodeData(enBlocks, dataBlocks, parityBlocks)
+		if err != nil {
+			return nil, err
+		}
+
+		// Write to the healPath file.
+		for index, disk := range outDatedDisks {
+			if disk == nil {
+				continue
+			}
+			err := disk.AppendFile(healBucket, healPath, enBlocks[index])
+			if err != nil {
+				return nil, err
+			}
+			hashWriters[index].Write(enBlocks[index])
+		}
+		remainingSize -= curBlockSize
+		offset += curEncBlockSize
+	}
+
+	// Checksums for the bit rot.
+	checkSums = make([]string, len(outDatedDisks))
+	for index, disk := range outDatedDisks {
+		if disk == nil {
+			continue
+		}
+		checkSums[index] = hex.EncodeToString(hashWriters[index].Sum(nil))
+	}
+	return checkSums, nil
+}

cmd/erasure-healfile_test.go

@@ -0,0 +1,123 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"crypto/rand"
+	"os"
+	"path"
+	"testing"
+)
+
+// Test erasureHealFile()
+func TestErasureHealFile(t *testing.T) {
+	// Initialize environment needed for the test.
+	dataBlocks := 7
+	parityBlocks := 7
+	blockSize := int64(blockSizeV1)
+	setup, err := newErasureTestSetup(dataBlocks, parityBlocks, blockSize)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer setup.Remove()
+
+	disks := setup.disks
+
+	// Prepare a slice of 1MB with random data.
+	data := make([]byte, 1*1024*1024)
+	_, err = rand.Read(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Create a test file.
+	size, checkSums, err := erasureCreateFile(disks, "testbucket", "testobject1", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != int64(len(data)) {
+		t.Errorf("erasureCreateFile returned %d, expected %d", size, len(data))
+	}
+
+	latest := make([]StorageAPI, len(disks))   // Slice of latest disks
+	outDated := make([]StorageAPI, len(disks)) // Slice of outdated disks
+
+	// Test case when one part needs to be healed.
+	dataPath := path.Join(setup.diskPaths[0], "testbucket", "testobject1")
+	err = os.Remove(dataPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	copy(latest, disks)
+	latest[0] = nil
+	outDated[0] = disks[0]
+	healCheckSums, err := erasureHealFile(latest, outDated, "testbucket", "testobject1", "testbucket", "testobject1", 1*1024*1024, blockSize, dataBlocks, parityBlocks, bitRotAlgo)
+	// Checksum of the healed file should match.
+	if checkSums[0] != healCheckSums[0] {
+		t.Error("Healing failed, data does not match.")
+	}
+
+	// Test case when parityBlocks number of disks need to be healed.
+	// Should succeed.
+	copy(latest, disks)
+	for index := 0; index < parityBlocks; index++ {
+		dataPath := path.Join(setup.diskPaths[index], "testbucket", "testobject1")
+		err = os.Remove(dataPath)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		latest[index] = nil
+		outDated[index] = disks[index]
+	}
+
+	healCheckSums, err = erasureHealFile(latest, outDated, "testbucket", "testobject1", "testbucket", "testobject1", 1*1024*1024, blockSize, dataBlocks, parityBlocks, bitRotAlgo)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Checksums of the healed files should match.
+	for index := 0; index < parityBlocks; index++ {
+		if checkSums[index] != healCheckSums[index] {
+			t.Error("Healing failed, data does not match.")
+		}
+	}
+	for index := dataBlocks; index < len(disks); index++ {
+		if healCheckSums[index] != "" {
+			t.Errorf("expected healCheckSums[%d] to be empty", index)
+		}
+	}
+
+	// Test case when parityBlocks+1 number of disks need to be healed.
+	// Should fail.
+	copy(latest, disks)
+	for index := 0; index < parityBlocks+1; index++ {
+		dataPath := path.Join(setup.diskPaths[index], "testbucket", "testobject1")
+		err = os.Remove(dataPath)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		latest[index] = nil
+		outDated[index] = disks[index]
+	}
+	healCheckSums, err = erasureHealFile(latest, outDated, "testbucket", "testobject1", "testbucket", "testobject1", 1*1024*1024, blockSize, dataBlocks, parityBlocks, bitRotAlgo)
+	if err == nil {
+		t.Error("Expected erasureHealFile() to fail when the number of available disks <= parityBlocks")
+	}
+}

cmd/erasure-readfile.go

@@ -0,0 +1,350 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"encoding/hex"
+	"errors"
+	"io"
+	"sync"
+
+	"github.com/klauspost/reedsolomon"
+	"github.com/minio/minio/pkg/bpool"
+)
+
+// isSuccessDecodeBlocks - do we have all the blocks to be
+// successfully decoded?. Input encoded blocks ordered matrix.
+func isSuccessDecodeBlocks(enBlocks [][]byte, dataBlocks int) bool {
+	// Count number of data and parity blocks that were read.
+	var successDataBlocksCount = 0
+	var successParityBlocksCount = 0
+	for index := range enBlocks {
+		if enBlocks[index] == nil {
+			continue
+		}
+		// block index lesser than data blocks, update data block count.
+		if index < dataBlocks {
+			successDataBlocksCount++
+			continue
+		} // else { // update parity block count.
+		successParityBlocksCount++
+	}
+	// Returns true if we have atleast dataBlocks parity.
+	return successDataBlocksCount == dataBlocks || successDataBlocksCount+successParityBlocksCount >= dataBlocks
+}
+
+// isSuccessDataBlocks - do we have all the data blocks?
+// Input encoded blocks ordered matrix.
+func isSuccessDataBlocks(enBlocks [][]byte, dataBlocks int) bool {
+	// Count number of data blocks that were read.
+	var successDataBlocksCount = 0
+	for index := range enBlocks[:dataBlocks] {
+		if enBlocks[index] == nil {
+			continue
+		}
+		// block index lesser than data blocks, update data block count.
+		if index < dataBlocks {
+			successDataBlocksCount++
+		}
+	}
+	// Returns true if we have atleast the dataBlocks.
+	return successDataBlocksCount >= dataBlocks
+}
+
+// Return readable disks slice from which we can read parallelly.
+func getReadDisks(orderedDisks []StorageAPI, index int, dataBlocks int) (readDisks []StorageAPI, nextIndex int, err error) {
+	readDisks = make([]StorageAPI, len(orderedDisks))
+	dataDisks := 0
+	parityDisks := 0
+	// Count already read data and parity chunks.
+	for i := 0; i < index; i++ {
+		if orderedDisks[i] == nil {
+			continue
+		}
+		if i < dataBlocks {
+			dataDisks++
+		} else {
+			parityDisks++
+		}
+	}
+
+	// Sanity checks - we should never have this situation.
+	if dataDisks == dataBlocks {
+		return nil, 0, errUnexpected
+	}
+	if dataDisks+parityDisks >= dataBlocks {
+		return nil, 0, errUnexpected
+	}
+
+	// Find the disks from which next set of parallel reads should happen.
+	for i := index; i < len(orderedDisks); i++ {
+		if orderedDisks[i] == nil {
+			continue
+		}
+		if i < dataBlocks {
+			dataDisks++
+		} else {
+			parityDisks++
+		}
+		readDisks[i] = orderedDisks[i]
+		if dataDisks == dataBlocks {
+			return readDisks, i + 1, nil
+		} else if dataDisks+parityDisks == dataBlocks {
+			return readDisks, i + 1, nil
+		}
+	}
+	return nil, 0, errXLReadQuorum
+}
+
+// parallelRead - reads chunks in parallel from the disks specified in []readDisks.
+func parallelRead(volume, path string, readDisks []StorageAPI, orderedDisks []StorageAPI, enBlocks [][]byte, blockOffset int64, curChunkSize int64, bitRotVerify func(diskIndex int) bool, pool *bpool.BytePool) {
+	// WaitGroup to synchronise the read go-routines.
+	wg := &sync.WaitGroup{}
+
+	// Read disks in parallel.
+	for index := range readDisks {
+		if readDisks[index] == nil {
+			continue
+		}
+		wg.Add(1)
+		// Reads chunk from readDisk[index] in routine.
+		go func(index int) {
+			defer wg.Done()
+
+			// Verify bit rot for the file on this disk.
+			if !bitRotVerify(index) {
+				// So that we don't read from this disk for the next block.
+				orderedDisks[index] = nil
+				return
+			}
+
+			buf, err := pool.Get()
+			if err != nil {
+				errorIf(err, "unable to get buffer from byte pool")
+				orderedDisks[index] = nil
+				return
+			}
+			buf = buf[:curChunkSize]
+
+			_, err = readDisks[index].ReadFile(volume, path, blockOffset, buf)
+			if err != nil {
+				orderedDisks[index] = nil
+				return
+			}
+			enBlocks[index] = buf
+		}(index)
+	}
+
+	// Waiting for first routines to finish.
+	wg.Wait()
+}
+
+// erasureReadFile - read bytes from erasure coded files and writes to given writer.
+// Erasure coded files are read block by block as per given erasureInfo and data chunks
+// are decoded into a data block. Data block is trimmed for given offset and length,
+// then written to given writer. This function also supports bit-rot detection by
+// verifying checksum of individual block's checksum.
+func erasureReadFile(writer io.Writer, disks []StorageAPI, volume string, path string, offset int64, length int64, totalLength int64, blockSize int64, dataBlocks int, parityBlocks int, checkSums []string, algo string, pool *bpool.BytePool) (int64, error) {
+	// Offset and length cannot be negative.
+	if offset < 0 || length < 0 {
+		return 0, errUnexpected
+	}
+
+	// Can't request more data than what is available.
+	if offset+length > totalLength {
+		return 0, errUnexpected
+	}
+
+	// chunkSize is the amount of data that needs to be read from each disk at a time.
+	chunkSize := getChunkSize(blockSize, dataBlocks)
+
+	// bitRotVerify verifies if the file on a particular disk doesn't have bitrot
+	// by verifying the hash of the contents of the file.
+	bitRotVerify := func() func(diskIndex int) bool {
+		verified := make([]bool, len(disks))
+		// Return closure so that we have reference to []verified and
+		// not recalculate the hash on it every time the function is
+		// called for the same disk.
+		return func(diskIndex int) bool {
+			if verified[diskIndex] {
+				// Already validated.
+				return true
+			}
+			// Is this a valid block?
+			isValid := isValidBlock(disks[diskIndex], volume, path, checkSums[diskIndex], algo)
+			verified[diskIndex] = isValid
+			return isValid
+		}
+	}()
+
+	// Total bytes written to writer
+	bytesWritten := int64(0)
+
+	startBlock := offset / blockSize
+	endBlock := (offset + length) / blockSize
+
+	// curChunkSize = chunk size for the current block in the for loop below.
+	// curBlockSize = block size for the current block in the for loop below.
+	// curChunkSize and curBlockSize can change for the last block if totalLength%blockSize != 0
+	curChunkSize := chunkSize
+	curBlockSize := blockSize
+
+	// For each block, read chunk from each disk. If we are able to read all the data disks then we don't
+	// need to read parity disks. If one of the data disk is missing we need to read DataBlocks+1 number
+	// of disks. Once read, we Reconstruct() missing data if needed and write it to the given writer.
+	for block := startBlock; block <= endBlock; block++ {
+		// Mark all buffers as unused at the start of the loop so that the buffers
+		// can be reused.
+		pool.Reset()
+
+		// Each element of enBlocks holds curChunkSize'd amount of data read from its corresponding disk.
+		enBlocks := make([][]byte, len(disks))
+
+		if ((offset + bytesWritten) / blockSize) == (totalLength / blockSize) {
+			// This is the last block for which curBlockSize and curChunkSize can change.
+			// For ex. if totalLength is 15M and blockSize is 10MB, curBlockSize for
+			// the last block should be 5MB.
+			curBlockSize = totalLength % blockSize
+			curChunkSize = getChunkSize(curBlockSize, dataBlocks)
+		}
+
+		// NOTE: That for the offset calculation we have to use chunkSize and
+		// not curChunkSize. If we use curChunkSize for offset calculation
+		// then it can result in wrong offset for the last block.
+		blockOffset := block * chunkSize
+
+		// nextIndex - index from which next set of parallel reads
+		// should happen.
+		nextIndex := 0
+
+		for {
+			// readDisks - disks from which we need to read in parallel.
+			var readDisks []StorageAPI
+			var err error
+			// get readable disks slice from which we can read parallelly.
+			readDisks, nextIndex, err = getReadDisks(disks, nextIndex, dataBlocks)
+			if err != nil {
+				return bytesWritten, err
+			}
+			// Issue a parallel read across the disks specified in readDisks.
+			parallelRead(volume, path, readDisks, disks, enBlocks, blockOffset, curChunkSize, bitRotVerify, pool)
+			if isSuccessDecodeBlocks(enBlocks, dataBlocks) {
+				// If enough blocks are available to do rs.Reconstruct()
+				break
+			}
+			if nextIndex == len(disks) {
+				// No more disks to read from.
+				return bytesWritten, errXLReadQuorum
+			}
+			// We do not have enough enough data blocks to reconstruct the data
+			// hence continue the for-loop till we have enough data blocks.
+		}
+
+		// If we have all the data blocks no need to decode, continue to write.
+		if !isSuccessDataBlocks(enBlocks, dataBlocks) {
+			// Reconstruct the missing data blocks.
+			if err := decodeData(enBlocks, dataBlocks, parityBlocks); err != nil {
+				return bytesWritten, err
+			}
+		}
+
+		// Offset in enBlocks from where data should be read from.
+		enBlocksOffset := int64(0)
+
+		// Total data to be read from enBlocks.
+		enBlocksLength := curBlockSize
+
+		// If this is the start block then enBlocksOffset might not be 0.
+		if block == startBlock {
+			enBlocksOffset = offset % blockSize
+			enBlocksLength -= enBlocksOffset
+		}
+
+		remaining := length - bytesWritten
+		if remaining < enBlocksLength {
+			// We should not send more data than what was requested.
+			enBlocksLength = remaining
+		}
+
+		// Write data blocks.
+		n, err := writeDataBlocks(writer, enBlocks, dataBlocks, enBlocksOffset, enBlocksLength)
+		if err != nil {
+			return bytesWritten, err
+		}
+
+		// Update total bytes written.
+		bytesWritten += n
+
+		if bytesWritten == length {
+			// Done writing all the requested data.
+			break
+		}
+	}
+
+	// Success.
+	return bytesWritten, nil
+}
+
+// isValidBlock - calculates the checksum hash for the block and
+// validates if its correct returns true for valid cases, false otherwise.
+func isValidBlock(disk StorageAPI, volume, path, checkSum, checkSumAlgo string) (ok bool) {
+	// Disk is not available, not a valid block.
+	if disk == nil {
+		return false
+	}
+	// Checksum not available, not a valid block.
+	if checkSum == "" {
+		return false
+	}
+	// Read everything for a given block and calculate hash.
+	hashWriter := newHash(checkSumAlgo)
+	hashBytes, err := hashSum(disk, volume, path, hashWriter)
+	if err != nil {
+		errorIf(err, "Unable to calculate checksum %s/%s", volume, path)
+		return false
+	}
+	return hex.EncodeToString(hashBytes) == checkSum
+}
+
+// decodeData - decode encoded blocks.
+func decodeData(enBlocks [][]byte, dataBlocks, parityBlocks int) error {
+	// Initialized reedsolomon.
+	rs, err := reedsolomon.New(dataBlocks, parityBlocks)
+	if err != nil {
+		return err
+	}
+
+	// Reconstruct encoded blocks.
+	err = rs.Reconstruct(enBlocks)
+	if err != nil {
+		return err
+	}
+
+	// Verify reconstructed blocks (parity).
+	ok, err := rs.Verify(enBlocks)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		// Blocks cannot be reconstructed, corrupted data.
+		err = errors.New("Verification failed after reconstruction, data likely corrupted.")
+		return err
+	}
+
+	// Success.
+	return nil
+}

cmd/erasure-readfile_test.go

@@ -0,0 +1,459 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/minio/minio/pkg/bpool"
+)
+import "reflect"
+
+// Tests getReadDisks which returns readable disks slice from which we can
+// read parallelly.
+func testGetReadDisks(t *testing.T, xl xlObjects) {
+	d := xl.storageDisks
+	testCases := []struct {
+		index     int          // index argument for getReadDisks
+		argDisks  []StorageAPI // disks argument for getReadDisks
+		retDisks  []StorageAPI // disks return value from getReadDisks
+		nextIndex int          // return value from getReadDisks
+		err       error        // error return value from getReadDisks
+	}{
+		// Test case - 1.
+		// When all disks are available, should return data disks.
+		{
+			0,
+			[]StorageAPI{d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]},
+			[]StorageAPI{d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], nil, nil, nil, nil, nil, nil, nil, nil},
+			8,
+			nil,
+		},
+		// Test case - 2.
+		// If a parity disk is down, should return all data disks.
+		{
+			0,
+			[]StorageAPI{d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], d[8], nil, d[10], d[11], d[12], d[13], d[14], d[15]},
+			[]StorageAPI{d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], nil, nil, nil, nil, nil, nil, nil, nil},
+			8,
+			nil,
+		},
+		// Test case - 3.
+		// If a data disk is down, should return 7 data and 1 parity.
+		{
+			0,
+			[]StorageAPI{nil, d[1], d[2], d[3], d[4], d[5], d[6], d[7], d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]},
+			[]StorageAPI{nil, d[1], d[2], d[3], d[4], d[5], d[6], d[7], d[8], nil, nil, nil, nil, nil, nil, nil},
+			9,
+			nil,
+		},
+		// Test case - 4.
+		// If 7 data disks are down, should return 1 data and 7 parity.
+		{
+			0,
+			[]StorageAPI{nil, nil, nil, nil, nil, nil, nil, d[7], d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]},
+			[]StorageAPI{nil, nil, nil, nil, nil, nil, nil, d[7], d[8], d[9], d[10], d[11], d[12], d[13], d[14], nil},
+			15,
+			nil,
+		},
+		// Test case - 5.
+		// When 2 disks fail during parallelRead, next call to getReadDisks should return 3 disks
+		{
+			8,
+			[]StorageAPI{nil, nil, d[2], d[3], d[4], d[5], d[6], d[7], d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]},
+			[]StorageAPI{nil, nil, nil, nil, nil, nil, nil, nil, d[8], d[9], nil, nil, nil, nil, nil, nil},
+			10,
+			nil,
+		},
+		// Test case - 6.
+		// If 2 disks again fail from the 3 disks returned previously, return next 2 disks
+		{
+			11,
+			[]StorageAPI{nil, nil, d[2], d[3], d[4], d[5], d[6], d[7], nil, nil, d[10], d[11], d[12], d[13], d[14], d[15]},
+			[]StorageAPI{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, d[11], nil, nil, nil, nil},
+			12,
+			nil,
+		},
+		// Test case - 7.
+		// No more disks are available for read, return error
+		{
+			13,
+			[]StorageAPI{nil, nil, d[2], d[3], d[4], d[5], d[6], d[7], nil, nil, d[10], nil, nil, nil, nil, nil},
+			nil,
+			0,
+			errXLReadQuorum,
+		},
+	}
+
+	for i, test := range testCases {
+		disks, nextIndex, err := getReadDisks(test.argDisks, test.index, xl.dataBlocks)
+		if err != test.err {
+			t.Errorf("test-case %d - expected error : %s, got : %s", i+1, test.err, err)
+			continue
+		}
+		if test.nextIndex != nextIndex {
+			t.Errorf("test-case %d - expected nextIndex: %d, got : %d", i+1, test.nextIndex, nextIndex)
+			continue
+		}
+		if !reflect.DeepEqual(test.retDisks, disks) {
+			t.Errorf("test-case %d : incorrect disks returned. expected %+v, got %+v", i+1, test.retDisks, disks)
+			continue
+		}
+	}
+}
+
+// Test getOrderedDisks which returns ordered slice of disks from their
+// actual distribution.
+func testGetOrderedDisks(t *testing.T, xl xlObjects) {
+	disks := xl.storageDisks
+	distribution := []int{16, 14, 12, 10, 8, 6, 4, 2, 1, 3, 5, 7, 9, 11, 13, 15}
+	orderedDisks := getOrderedDisks(distribution, disks)
+	// From the "distribution" above you can notice that:
+	// 1st data block is in the 9th disk (i.e distribution index 8)
+	// 2nd data block is in the 8th disk (i.e distribution index 7) and so on.
+	if orderedDisks[0] != disks[8] ||
+		orderedDisks[1] != disks[7] ||
+		orderedDisks[2] != disks[9] ||
+		orderedDisks[3] != disks[6] ||
+		orderedDisks[4] != disks[10] ||
+		orderedDisks[5] != disks[5] ||
+		orderedDisks[6] != disks[11] ||
+		orderedDisks[7] != disks[4] ||
+		orderedDisks[8] != disks[12] ||
+		orderedDisks[9] != disks[3] ||
+		orderedDisks[10] != disks[13] ||
+		orderedDisks[11] != disks[2] ||
+		orderedDisks[12] != disks[14] ||
+		orderedDisks[13] != disks[1] ||
+		orderedDisks[14] != disks[15] ||
+		orderedDisks[15] != disks[0] {
+		t.Errorf("getOrderedDisks returned incorrect order.")
+	}
+}
+
+// Test for isSuccessDataBlocks and isSuccessDecodeBlocks.
+func TestIsSuccessBlocks(t *testing.T) {
+	dataBlocks := 8
+	testCases := []struct {
+		enBlocks      [][]byte // data and parity blocks.
+		successData   bool     // expected return value of isSuccessDataBlocks()
+		successDecode bool     // expected return value of isSuccessDecodeBlocks()
+	}{
+		{
+			// When all data and partity blocks are available.
+			[][]byte{
+				{'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'},
+				{'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'},
+			},
+			true,
+			true,
+		},
+		{
+			// When one data block is not available.
+			[][]byte{
+				nil, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'},
+				{'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'},
+			},
+			false,
+			true,
+		},
+		{
+			// When one data and all parity are available, enough for reedsolomon.Reconstruct()
+			[][]byte{
+				nil, nil, nil, nil, nil, nil, nil, {'a'},
+				{'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'},
+			},
+			false,
+			true,
+		},
+		{
+			// When all data disks are not available, enough for reedsolomon.Reconstruct()
+			[][]byte{
+				nil, nil, nil, nil, nil, nil, nil, nil,
+				{'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'},
+			},
+			false,
+			true,
+		},
+		{
+			// Not enough disks for reedsolomon.Reconstruct()
+			[][]byte{
+				nil, nil, nil, nil, nil, nil, nil, nil,
+				nil, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'}, {'a'},
+			},
+			false,
+			false,
+		},
+	}
+
+	for i, test := range testCases {
+		got := isSuccessDataBlocks(test.enBlocks, dataBlocks)
+		if test.successData != got {
+			t.Errorf("test-case %d : expected %v got %v", i+1, test.successData, got)
+		}
+		got = isSuccessDecodeBlocks(test.enBlocks, dataBlocks)
+		if test.successDecode != got {
+			t.Errorf("test-case %d : expected %v got %v", i+1, test.successDecode, got)
+		}
+	}
+}
+
+// Wrapper function for testGetReadDisks, testGetOrderedDisks.
+func TestErasureReadUtils(t *testing.T) {
+	objLayer, dirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer removeRoots(dirs)
+	xl := objLayer.(xlObjects)
+	testGetReadDisks(t, xl)
+	testGetOrderedDisks(t, xl)
+}
+
+// Simulates a faulty disk for ReadFile()
+type ReadDiskDown struct {
+	*posix
+}
+
+func (r ReadDiskDown) ReadFile(volume string, path string, offset int64, buf []byte) (n int64, err error) {
+	return 0, errFaultyDisk
+}
+
+func TestErasureReadFileDiskFail(t *testing.T) {
+	// Initialize environment needed for the test.
+	dataBlocks := 7
+	parityBlocks := 7
+	blockSize := int64(blockSizeV1)
+	setup, err := newErasureTestSetup(dataBlocks, parityBlocks, blockSize)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer setup.Remove()
+
+	disks := setup.disks
+
+	// Prepare a slice of 1MB with random data.
+	data := make([]byte, 1*1024*1024)
+	length := int64(len(data))
+	_, err = rand.Read(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Create a test file to read from.
+	size, checkSums, err := erasureCreateFile(disks, "testbucket", "testobject", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != length {
+		t.Errorf("erasureCreateFile returned %d, expected %d", size, length)
+	}
+
+	// create byte pool which will be used by erasureReadFile for
+	// reading from disks and erasure decoding.
+	chunkSize := getChunkSize(blockSize, dataBlocks)
+	pool := bpool.NewBytePool(chunkSize, len(disks))
+
+	buf := &bytes.Buffer{}
+	_, err = erasureReadFile(buf, disks, "testbucket", "testobject", 0, length, length, blockSize, dataBlocks, parityBlocks, checkSums, bitRotAlgo, pool)
+	if err != nil {
+		t.Error(err)
+	}
+	if !bytes.Equal(buf.Bytes(), data) {
+		t.Error("Contents of the erasure coded file differs")
+	}
+
+	// 2 disks down. Read should succeed.
+	disks[4] = ReadDiskDown{disks[4].(*posix)}
+	disks[5] = ReadDiskDown{disks[5].(*posix)}
+
+	buf.Reset()
+	_, err = erasureReadFile(buf, disks, "testbucket", "testobject", 0, length, length, blockSize, dataBlocks, parityBlocks, checkSums, bitRotAlgo, pool)
+	if err != nil {
+		t.Error(err)
+	}
+	if !bytes.Equal(buf.Bytes(), data) {
+		t.Error("Contents of the erasure coded file differs")
+	}
+
+	// 4 more disks down. 6 disks down in total. Read should succeed.
+	disks[6] = ReadDiskDown{disks[6].(*posix)}
+	disks[8] = ReadDiskDown{disks[8].(*posix)}
+	disks[9] = ReadDiskDown{disks[9].(*posix)}
+	disks[11] = ReadDiskDown{disks[11].(*posix)}
+
+	buf.Reset()
+	_, err = erasureReadFile(buf, disks, "testbucket", "testobject", 0, length, length, blockSize, dataBlocks, parityBlocks, checkSums, bitRotAlgo, pool)
+	if err != nil {
+		t.Error(err)
+	}
+	if !bytes.Equal(buf.Bytes(), data) {
+		t.Error("Contents of the erasure coded file differs")
+	}
+
+	// 2 more disk down. 8 disks down in total. Read should fail.
+	disks[12] = ReadDiskDown{disks[12].(*posix)}
+	disks[13] = ReadDiskDown{disks[13].(*posix)}
+	buf.Reset()
+	_, err = erasureReadFile(buf, disks, "testbucket", "testobject", 0, length, length, blockSize, dataBlocks, parityBlocks, checkSums, bitRotAlgo, pool)
+	if err != errXLReadQuorum {
+		t.Fatal("expected errXLReadQuorum error")
+	}
+}
+
+func TestErasureReadFileOffsetLength(t *testing.T) {
+	// Initialize environment needed for the test.
+	dataBlocks := 7
+	parityBlocks := 7
+	blockSize := int64(1 * 1024 * 1024)
+	setup, err := newErasureTestSetup(dataBlocks, parityBlocks, blockSize)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer setup.Remove()
+
+	disks := setup.disks
+
+	// Prepare a slice of 5MB with random data.
+	data := make([]byte, 5*1024*1024)
+	length := int64(len(data))
+	_, err = rand.Read(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Create a test file to read from.
+	size, checkSums, err := erasureCreateFile(disks, "testbucket", "testobject", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != length {
+		t.Errorf("erasureCreateFile returned %d, expected %d", size, length)
+	}
+
+	testCases := []struct {
+		offset, length int64
+	}{
+		// Full file.
+		{0, length},
+		// Read nothing.
+		{length, 0},
+		// 2nd block.
+		{blockSize, blockSize},
+		// Test cases for random offsets and lengths.
+		{blockSize - 1, 2},
+		{blockSize - 1, blockSize + 1},
+		{blockSize + 1, blockSize - 1},
+		{blockSize + 1, blockSize},
+		{blockSize + 1, blockSize + 1},
+		{blockSize*2 - 1, blockSize + 1},
+		{length - 1, 1},
+		{length - blockSize, blockSize},
+		{length - blockSize - 1, blockSize},
+		{length - blockSize - 1, blockSize + 1},
+	}
+	chunkSize := getChunkSize(blockSize, dataBlocks)
+	pool := bpool.NewBytePool(chunkSize, len(disks))
+
+	// Compare the data read from file with "data" byte array.
+	for i, testCase := range testCases {
+		expected := data[testCase.offset:(testCase.offset + testCase.length)]
+		buf := &bytes.Buffer{}
+		_, err = erasureReadFile(buf, disks, "testbucket", "testobject", testCase.offset, testCase.length, length, blockSize, dataBlocks, parityBlocks, checkSums, bitRotAlgo, pool)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		got := buf.Bytes()
+		if !bytes.Equal(expected, got) {
+			t.Errorf("Test %d : read data is different from what was expected", i+1)
+		}
+	}
+}
+
+// Test erasureReadFile with random offset and lengths.
+// This test is t.Skip()ed as it a long time to run, hence should be run
+// explicitly after commenting out t.Skip()
+func TestErasureReadFileRandomOffsetLength(t *testing.T) {
+	// Comment the following line to run this test.
+	t.SkipNow()
+	// Initialize environment needed for the test.
+	dataBlocks := 7
+	parityBlocks := 7
+	blockSize := int64(1 * 1024 * 1024)
+	setup, err := newErasureTestSetup(dataBlocks, parityBlocks, blockSize)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer setup.Remove()
+
+	disks := setup.disks
+
+	// Prepare a slice of 5MB with random data.
+	data := make([]byte, 5*1024*1024)
+	length := int64(len(data))
+	_, err = rand.Read(data)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// 10000 iterations with random offsets and lengths.
+	iterations := 10000
+
+	// Create a test file to read from.
+	size, checkSums, err := erasureCreateFile(disks, "testbucket", "testobject", bytes.NewReader(data), blockSize, dataBlocks, parityBlocks, bitRotAlgo, dataBlocks+1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if size != length {
+		t.Errorf("erasureCreateFile returned %d, expected %d", size, length)
+	}
+
+	// To generate random offset/length.
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+
+	// create pool buffer which will be used by erasureReadFile for
+	// reading from disks and erasure decoding.
+	chunkSize := getChunkSize(blockSize, dataBlocks)
+	pool := bpool.NewBytePool(chunkSize, len(disks))
+
+	buf := &bytes.Buffer{}
+
+	// Verify erasureReadFile() for random offsets and lengths.
+	for i := 0; i < iterations; i++ {
+		offset := r.Int63n(length)
+		readLen := r.Int63n(length - offset)
+
+		expected := data[offset : offset+readLen]
+
+		_, err = erasureReadFile(buf, disks, "testbucket", "testobject", offset, readLen, length, blockSize, dataBlocks, parityBlocks, checkSums, bitRotAlgo, pool)
+		if err != nil {
+			t.Fatal(err, offset, readLen)
+		}
+		got := buf.Bytes()
+		if !bytes.Equal(expected, got) {
+			t.Fatalf("read data is different from what was expected, offset=%d length=%d", offset, readLen)
+		}
+		buf.Reset()
+	}
+}

cmd/erasure-utils.go

@@ -0,0 +1,197 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"errors"
+	"hash"
+	"io"
+	"sync"
+
+	"github.com/klauspost/reedsolomon"
+	"github.com/minio/blake2b-simd"
+)
+
+// newHashWriters - inititialize a slice of hashes for the disk count.
+func newHashWriters(diskCount int, algo string) []hash.Hash {
+	hashWriters := make([]hash.Hash, diskCount)
+	for index := range hashWriters {
+		hashWriters[index] = newHash(algo)
+	}
+	return hashWriters
+}
+
+// newHash - gives you a newly allocated hash depending on the input algorithm.
+func newHash(algo string) hash.Hash {
+	switch algo {
+	case "blake2b":
+		return blake2b.New512()
+	// Add new hashes here.
+	default:
+		// Default to blake2b.
+		return blake2b.New512()
+	}
+}
+
+var hashBufPool = sync.Pool{
+	New: func() interface{} {
+		b := make([]byte, readSizeV1)
+		return &b
+	},
+}
+
+// hashSum calculates the hash of the entire path and returns.
+func hashSum(disk StorageAPI, volume, path string, writer hash.Hash) ([]byte, error) {
+	// Allocate staging buffer of 2MiB for copyBuffer.
+	bufp := hashBufPool.Get().(*[]byte)
+
+	// Reuse buffer.
+	defer hashBufPool.Put(bufp)
+
+	// Copy entire buffer to writer.
+	if err := copyBuffer(writer, disk, volume, path, *bufp); err != nil {
+		return nil, err
+	}
+
+	// Return the final hash sum.
+	return writer.Sum(nil), nil
+}
+
+// getDataBlockLen - get length of data blocks from encoded blocks.
+func getDataBlockLen(enBlocks [][]byte, dataBlocks int) int {
+	size := 0
+	// Figure out the data block length.
+	for _, block := range enBlocks[:dataBlocks] {
+		size += len(block)
+	}
+	return size
+}
+
+// Writes all the data blocks from encoded blocks until requested
+// outSize length. Provides a way to skip bytes until the offset.
+func writeDataBlocks(dst io.Writer, enBlocks [][]byte, dataBlocks int, offset int64, length int64) (int64, error) {
+	// Offset and out size cannot be negative.
+	if offset < 0 || length < 0 {
+		return 0, errUnexpected
+	}
+
+	// Do we have enough blocks?
+	if len(enBlocks) < dataBlocks {
+		return 0, reedsolomon.ErrTooFewShards
+	}
+
+	// Do we have enough data?
+	if int64(getDataBlockLen(enBlocks, dataBlocks)) < length {
+		return 0, reedsolomon.ErrShortData
+	}
+
+	// Counter to decrement total left to write.
+	write := length
+
+	// Counter to increment total written.
+	totalWritten := int64(0)
+
+	// Write all data blocks to dst.
+	for _, block := range enBlocks[:dataBlocks] {
+		// Skip blocks until we have reached our offset.
+		if offset >= int64(len(block)) {
+			// Decrement offset.
+			offset -= int64(len(block))
+			continue
+		} else {
+			// Skip until offset.
+			block = block[offset:]
+
+			// Reset the offset for next iteration to read everything
+			// from subsequent blocks.
+			offset = 0
+		}
+		// We have written all the blocks, write the last remaining block.
+		if write < int64(len(block)) {
+			n, err := io.Copy(dst, bytes.NewReader(block[:write]))
+			if err != nil {
+				return 0, err
+			}
+			totalWritten += n
+			break
+		}
+		// Copy the block.
+		n, err := io.Copy(dst, bytes.NewReader(block))
+		if err != nil {
+			return 0, err
+		}
+
+		// Decrement output size.
+		write -= n
+
+		// Increment written.
+		totalWritten += n
+	}
+
+	// Success.
+	return totalWritten, nil
+}
+
+// chunkSize is roughly BlockSize/DataBlocks.
+// chunkSize is calculated such that chunkSize*DataBlocks accommodates BlockSize bytes.
+// So chunkSize*DataBlocks can be slightly larger than BlockSize if BlockSize is not divisible by
+// DataBlocks. The extra space will have 0-padding.
+func getChunkSize(blockSize int64, dataBlocks int) int64 {
+	return (blockSize + int64(dataBlocks) - 1) / int64(dataBlocks)
+}
+
+// copyBuffer - copies from disk, volume, path to input writer until either EOF
+// is reached at volume, path or an error occurs. A success copyBuffer returns
+// err == nil, not err == EOF. Because copyBuffer is defined to read from path
+// until EOF. It does not treat an EOF from ReadFile an error to be reported.
+// Additionally copyBuffer stages through the provided buffer; otherwise if it
+// has zero length, returns error.
+func copyBuffer(writer io.Writer, disk StorageAPI, volume string, path string, buf []byte) error {
+	// Error condition of zero length buffer.
+	if buf != nil && len(buf) == 0 {
+		return errors.New("empty buffer in readBuffer")
+	}
+
+	// Starting offset for Reading the file.
+	startOffset := int64(0)
+
+	// Read until io.EOF.
+	for {
+		n, err := disk.ReadFile(volume, path, startOffset, buf)
+		if n > 0 {
+			m, wErr := writer.Write(buf[:n])
+			if wErr != nil {
+				return wErr
+			}
+			if int64(m) != n {
+				return io.ErrShortWrite
+			}
+		}
+		if err != nil {
+			if err == io.EOF || err == io.ErrUnexpectedEOF {
+				break
+			}
+			return err
+		}
+		// Progress the offset.
+		startOffset += n
+	}
+
+	// Success.
+	return nil
+}

cmd/erasure-utils_test.go

@@ -0,0 +1,160 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"errors"
+	"io"
+	"testing"
+)
+
+// Test validates the number hash writers returned.
+func TestNewHashWriters(t *testing.T) {
+	diskNum := 8
+	hashWriters := newHashWriters(diskNum, bitRotAlgo)
+	if len(hashWriters) != diskNum {
+		t.Errorf("Expected %d hashWriters, but instead got %d", diskNum, len(hashWriters))
+	}
+
+}
+
+// Tests validate the output of getChunkSize.
+func TestGetChunkSize(t *testing.T) {
+	// Refer to comments on getChunkSize() for details.
+	testCases := []struct {
+		blockSize  int64
+		dataBlocks int
+		// expected result.
+		expectedChunkSize int64
+	}{
+		{
+			10,
+			10,
+			1,
+		},
+		{
+			10,
+			11,
+			1,
+		},
+		{
+			10,
+			9,
+			2,
+		},
+	}
+	// Verify getChunkSize() for the test cases.
+	for i, testCase := range testCases {
+		got := getChunkSize(testCase.blockSize, testCase.dataBlocks)
+		if testCase.expectedChunkSize != got {
+			t.Errorf("Test %d : expected=%d got=%d", i+1, testCase.expectedChunkSize, got)
+		}
+	}
+}
+
+// TestCopyBuffer - Tests validate the result and errors produced when `copyBuffer` is called with sample inputs.
+func TestCopyBuffer(t *testing.T) {
+	// create posix test setup
+	disk, diskPath, err := newPosixTestSetup()
+	if err != nil {
+		t.Fatalf("Unable to create posix test setup, %s", err)
+	}
+	defer removeAll(diskPath)
+
+	volume := "success-vol"
+	// Setup test environment.
+	if err = disk.MakeVol(volume); err != nil {
+		t.Fatalf("Unable to create volume, %s", err)
+	}
+
+	// creating io.Writer for the input to copyBuffer.
+	buffers := []*bytes.Buffer{
+		new(bytes.Buffer),
+		new(bytes.Buffer),
+		new(bytes.Buffer),
+	}
+
+	testFile := "testFile"
+	testContent := []byte("hello, world")
+	err = disk.AppendFile(volume, testFile, testContent)
+	if err != nil {
+		t.Fatalf("AppendFile failed: <ERROR> %s", err)
+	}
+
+	testCases := []struct {
+		writer io.Writer
+		disk   StorageAPI
+		volume string
+		path   string
+		buf    []byte
+
+		expectedResult []byte
+		// flag to indicate whether test case should pass.
+		shouldPass  bool
+		expectedErr error
+	}{
+		// Test case - 1.
+		// case with empty buffer.
+		{nil, nil, "", "", []byte{}, nil, false, errors.New("empty buffer in readBuffer")},
+		// Test case - 2.
+		// Test case with empty volume.
+		{buffers[0], disk, "", "", make([]byte, 5), nil, false, errInvalidArgument},
+		// Test case - 3.
+		// Test case with non existent volume.
+		{buffers[0], disk, "abc", "", make([]byte, 5), nil, false, errVolumeNotFound},
+		// Test case - 4.
+		// Test case with empty filename/path.
+		{buffers[0], disk, volume, "", make([]byte, 5), nil, false, errIsNotRegular},
+		// Test case - 5.
+		// Test case with non existent file name.
+		{buffers[0], disk, volume, "abcd", make([]byte, 5), nil, false, errFileNotFound},
+		// Test case - 6.
+		// Test case where the writer returns EOF.
+		{NewEOFWriter(buffers[0], 3), disk, volume, testFile, make([]byte, 5), nil, false, io.EOF},
+		// Test case - 7.
+		// Test case to produce io.ErrShortWrite, the TruncateWriter returns after writing 3 bytes.
+		{TruncateWriter(buffers[1], 3), disk, volume, testFile, make([]byte, 5), nil, false, io.ErrShortWrite},
+		// Teset case - 8.
+		// Valid case, expected to read till EOF and write the contents into the writer.
+		{buffers[2], disk, volume, testFile, make([]byte, 5), testContent, true, nil},
+	}
+	// iterate over the test cases and call copy Buffer with data.
+	for i, testCase := range testCases {
+		actualErr := copyBuffer(testCase.writer, testCase.disk, testCase.volume, testCase.path, testCase.buf)
+
+		if actualErr != nil && testCase.shouldPass {
+			t.Errorf("Test %d: Expected to pass but failed instead with \"%s\"", i+1, actualErr)
+		}
+
+		if actualErr == nil && !testCase.shouldPass {
+			t.Errorf("Test %d: Expected to fail with error <Error> \"%v\", but instead passed", i+1, testCase.expectedErr)
+		}
+		// Failed as expected, but does it fail for the expected reason.
+		if actualErr != nil && !testCase.shouldPass {
+			if testCase.expectedErr.Error() != actualErr.Error() {
+				t.Errorf("Test %d: Expected Error to be \"%v\", but instead found \"%v\" ", i+1, testCase.expectedErr, actualErr)
+			}
+		}
+		// test passed as expected, asserting the result.
+		if actualErr == nil && testCase.shouldPass {
+			if !bytes.Equal(testCase.expectedResult, buffers[2].Bytes()) {
+				t.Errorf("Test %d: copied buffer differs from the expected one.", i+1)
+			}
+		}
+	}
+}

cmd/erasure_test.go

@@ -0,0 +1,184 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"testing"
+)
+
+// mustEncodeData - encodes data slice and provides encoded 2 dimensional slice.
+func mustEncodeData(data []byte, dataBlocks, parityBlocks int) [][]byte {
+	encodedData, err := encodeData(data, dataBlocks, parityBlocks)
+	if err != nil {
+		// Upon failure panic this function.
+		panic(err)
+	}
+	return encodedData
+}
+
+// Generates good encoded data with one parity block and data block missing.
+func getGoodEncodedData(data []byte, dataBlocks, parityBlocks int) [][]byte {
+	encodedData := mustEncodeData(data, dataBlocks, parityBlocks)
+	encodedData[3] = nil
+	encodedData[1] = nil
+	return encodedData
+}
+
+// Generates bad encoded data with one parity block and data block with garbage data.
+func getBadEncodedData(data []byte, dataBlocks, parityBlocks int) [][]byte {
+	encodedData := mustEncodeData(data, dataBlocks, parityBlocks)
+	encodedData[3] = []byte("garbage")
+	encodedData[1] = []byte("garbage")
+	return encodedData
+}
+
+// Generates encoded data with all data blocks missing.
+func getMissingData(data []byte, dataBlocks, parityBlocks int) [][]byte {
+	encodedData := mustEncodeData(data, dataBlocks, parityBlocks)
+	for i := 0; i < dataBlocks+1; i++ {
+		encodedData[i] = nil
+	}
+	return encodedData
+}
+
+// Generates encoded data with less number of blocks than expected data blocks.
+func getInsufficientData(data []byte, dataBlocks, parityBlocks int) [][]byte {
+	encodedData := mustEncodeData(data, dataBlocks, parityBlocks)
+	// Return half of the data.
+	return encodedData[:dataBlocks/2]
+}
+
+// Represents erasure encoding matrix dataBlocks and paritBlocks.
+type encodingMatrix struct {
+	dataBlocks   int
+	parityBlocks int
+}
+
+// List of encoding matrices the tests will run on.
+var encodingMatrices = []encodingMatrix{
+	{3, 3}, // 3 data, 3 parity blocks.
+	{4, 4}, // 4 data, 4 parity blocks.
+	{5, 5}, // 5 data, 5 parity blocks.
+	{6, 6}, // 6 data, 6 parity blocks.
+	{7, 7}, // 7 data, 7 parity blocks.
+	{8, 8}, // 8 data, 8 parity blocks.
+}
+
+// Tests erasure decoding functionality for various types of inputs.
+func TestErasureDecode(t *testing.T) {
+	data := []byte("Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.")
+
+	// List of decoding cases
+	// - validates bad encoded data.
+	// - validates good encoded data.
+	// - validates insufficient data.
+	testDecodeCases := []struct {
+		enFn       func([]byte, int, int) [][]byte
+		shouldPass bool
+	}{
+		// Generates bad encoded data.
+		{
+			enFn:       getBadEncodedData,
+			shouldPass: false,
+		},
+		// Generates good encoded data.
+		{
+			enFn:       getGoodEncodedData,
+			shouldPass: true,
+		},
+		// Generates missing data.
+		{
+			enFn:       getMissingData,
+			shouldPass: false,
+		},
+		// Generates short data.
+		{
+			enFn:       getInsufficientData,
+			shouldPass: false,
+		},
+	}
+
+	// Validates all decode tests.
+	for i, testCase := range testDecodeCases {
+		for _, encodingMatrix := range encodingMatrices {
+
+			// Encoding matrix.
+			dataBlocks := encodingMatrix.dataBlocks
+			parityBlocks := encodingMatrix.parityBlocks
+
+			// Data block size.
+			blockSize := len(data)
+
+			// Generates encoded data based on type of testCase function.
+			encodedData := testCase.enFn(data, dataBlocks, parityBlocks)
+
+			// Decodes the data.
+			err := decodeData(encodedData, dataBlocks, parityBlocks)
+			if err != nil && testCase.shouldPass {
+				t.Errorf("Test %d: Expected to pass by failed instead with %s", i+1, err)
+			}
+
+			// Proceed to extract the data blocks.
+			decodedDataWriter := new(bytes.Buffer)
+			_, err = writeDataBlocks(decodedDataWriter, encodedData, dataBlocks, 0, int64(blockSize))
+			if err != nil && testCase.shouldPass {
+				t.Errorf("Test %d: Expected to pass by failed instead with %s", i+1, err)
+			}
+
+			// Validate if decoded data is what we expected.
+			if bytes.Equal(decodedDataWriter.Bytes(), data) != testCase.shouldPass {
+				err := errUnexpected
+				t.Errorf("Test %d: Expected to pass by failed instead %s", i+1, err)
+			}
+		}
+	}
+}
+
+// Setup for erasureCreateFile and erasureReadFile tests.
+type erasureTestSetup struct {
+	dataBlocks   int
+	parityBlocks int
+	blockSize    int64
+	diskPaths    []string
+	disks        []StorageAPI
+}
+
+// Removes the temporary disk directories.
+func (e erasureTestSetup) Remove() {
+	for _, path := range e.diskPaths {
+		removeAll(path)
+	}
+}
+
+// Returns an initialized setup for erasure tests.
+func newErasureTestSetup(dataBlocks int, parityBlocks int, blockSize int64) (*erasureTestSetup, error) {
+	diskPaths := make([]string, dataBlocks+parityBlocks)
+	disks := make([]StorageAPI, len(diskPaths))
+	var err error
+	for i := range diskPaths {
+		disks[i], diskPaths[i], err = newPosixTestSetup()
+		if err != nil {
+			return nil, err
+		}
+		err = disks[i].MakeVol("testbucket")
+		if err != nil {
+			return nil, err
+		}
+	}
+	return &erasureTestSetup{dataBlocks, parityBlocks, blockSize, diskPaths, disks}, nil
+}

cmd/event-notifier.go

@@ -0,0 +1,386 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"encoding/xml"
+	"fmt"
+	"net/url"
+	"path"
+	"sync"
+	"time"
+
+	"github.com/Sirupsen/logrus"
+)
+
+// Global event notification queue. This is the queue that would be used to send all notifications.
+type eventNotifier struct {
+	rwMutex *sync.RWMutex
+
+	// Collection of 'bucket' and notification config.
+	notificationConfigs map[string]*notificationConfig
+	snsTargets          map[string][]chan []NotificationEvent
+	queueTargets        map[string]*logrus.Logger
+}
+
+// Represents data to be sent with notification event.
+type eventData struct {
+	Type      EventName
+	Bucket    string
+	ObjInfo   ObjectInfo
+	ReqParams map[string]string
+}
+
+// New notification event constructs a new notification event message from
+// input request metadata which completed successfully.
+func newNotificationEvent(event eventData) NotificationEvent {
+	/// Construct a new object created event.
+	region := serverConfig.GetRegion()
+	tnow := time.Now().UTC()
+	sequencer := fmt.Sprintf("%X", tnow.UnixNano())
+	// Following blocks fills in all the necessary details of s3 event message structure.
+	// http://docs.aws.amazon.com/AmazonS3/latest/dev/notification-content-structure.html
+	nEvent := NotificationEvent{
+		EventVersion:      "2.0",
+		EventSource:       "aws:s3",
+		AwsRegion:         region,
+		EventTime:         tnow.Format(timeFormatAMZ),
+		EventName:         event.Type.String(),
+		UserIdentity:      defaultIdentity(),
+		RequestParameters: event.ReqParams,
+		ResponseElements:  map[string]string{},
+		S3: eventMeta{
+			SchemaVersion:   "1.0",
+			ConfigurationID: "Config",
+			Bucket: bucketMeta{
+				Name:          event.Bucket,
+				OwnerIdentity: defaultIdentity(),
+				ARN:           "arn:aws:s3:::" + event.Bucket,
+			},
+		},
+	}
+
+	escapedObj := url.QueryEscape(event.ObjInfo.Name)
+	// For delete object event type, we do not need to set ETag and Size.
+	if event.Type == ObjectRemovedDelete {
+		nEvent.S3.Object = objectMeta{
+			Key:       escapedObj,
+			Sequencer: sequencer,
+		}
+		return nEvent
+	}
+	// For all other events we should set ETag and Size.
+	nEvent.S3.Object = objectMeta{
+		Key:       escapedObj,
+		ETag:      event.ObjInfo.MD5Sum,
+		Size:      event.ObjInfo.Size,
+		Sequencer: sequencer,
+	}
+	// Success.
+	return nEvent
+}
+
+// Fetch the saved queue target.
+func (en eventNotifier) GetQueueTarget(queueARN string) *logrus.Logger {
+	return en.queueTargets[queueARN]
+}
+
+func (en eventNotifier) GetSNSTarget(snsARN string) []chan []NotificationEvent {
+	en.rwMutex.RLock()
+	defer en.rwMutex.RUnlock()
+	return en.snsTargets[snsARN]
+}
+
+// Set a new sns target for an input sns ARN.
+func (en *eventNotifier) SetSNSTarget(snsARN string, listenerCh chan []NotificationEvent) error {
+	en.rwMutex.Lock()
+	defer en.rwMutex.Unlock()
+	if listenerCh == nil {
+		return errInvalidArgument
+	}
+	en.snsTargets[snsARN] = append(en.snsTargets[snsARN], listenerCh)
+	return nil
+}
+
+// Remove sns target for an input sns ARN.
+func (en *eventNotifier) RemoveSNSTarget(snsARN string, listenerCh chan []NotificationEvent) {
+	en.rwMutex.Lock()
+	defer en.rwMutex.Unlock()
+	snsTarget, ok := en.snsTargets[snsARN]
+	if ok {
+		for i, savedListenerCh := range snsTarget {
+			if listenerCh == savedListenerCh {
+				snsTarget = append(snsTarget[:i], snsTarget[i+1:]...)
+				if len(snsTarget) == 0 {
+					delete(en.snsTargets, snsARN)
+					break
+				}
+				en.snsTargets[snsARN] = snsTarget
+			}
+		}
+	}
+}
+
+// Returns true if bucket notification is set for the bucket, false otherwise.
+func (en *eventNotifier) IsBucketNotificationSet(bucket string) bool {
+	if en == nil {
+		return false
+	}
+	en.rwMutex.RLock()
+	defer en.rwMutex.RUnlock()
+	_, ok := en.notificationConfigs[bucket]
+	return ok
+}
+
+// Fetch bucket notification config for an input bucket.
+func (en eventNotifier) GetBucketNotificationConfig(bucket string) *notificationConfig {
+	en.rwMutex.RLock()
+	defer en.rwMutex.RUnlock()
+	return en.notificationConfigs[bucket]
+}
+
+// Set a new notification config for a bucket, this operation will overwrite any previous
+// notification configs for the bucket.
+func (en *eventNotifier) SetBucketNotificationConfig(bucket string, notificationCfg *notificationConfig) error {
+	en.rwMutex.Lock()
+	defer en.rwMutex.Unlock()
+	if notificationCfg == nil {
+		return errInvalidArgument
+	}
+	en.notificationConfigs[bucket] = notificationCfg
+	return nil
+}
+
+// eventNotify notifies an event to relevant targets based on their
+// bucket notification configs.
+func eventNotify(event eventData) {
+	// Notifies a new event.
+	// List of events reported through this function are
+	//  - s3:ObjectCreated:Put
+	//  - s3:ObjectCreated:Post
+	//  - s3:ObjectCreated:Copy
+	//  - s3:ObjectCreated:CompleteMultipartUpload
+	//  - s3:ObjectRemoved:Delete
+
+	nConfig := globalEventNotifier.GetBucketNotificationConfig(event.Bucket)
+	// No bucket notifications enabled, drop the event notification.
+	if nConfig == nil {
+		return
+	}
+	if len(nConfig.QueueConfigs) == 0 && len(nConfig.TopicConfigs) == 0 && len(nConfig.LambdaConfigs) == 0 {
+		return
+	}
+
+	// Event type.
+	eventType := event.Type.String()
+
+	// Object name.
+	objectName := event.ObjInfo.Name
+
+	// Save the notification event to be sent.
+	notificationEvent := []NotificationEvent{newNotificationEvent(event)}
+
+	// Validate if the event and object match the queue configs.
+	for _, qConfig := range nConfig.QueueConfigs {
+		eventMatch := eventMatch(eventType, qConfig.Events)
+		ruleMatch := filterRuleMatch(objectName, qConfig.Filter.Key.FilterRules)
+		if eventMatch && ruleMatch {
+			targetLog := globalEventNotifier.GetQueueTarget(qConfig.QueueARN)
+			if targetLog != nil {
+				targetLog.WithFields(logrus.Fields{
+					"Records": notificationEvent,
+				}).Info()
+			}
+		}
+	}
+	// Validate if the event and object match the sns configs.
+	for _, topicConfig := range nConfig.TopicConfigs {
+		ruleMatch := filterRuleMatch(objectName, topicConfig.Filter.Key.FilterRules)
+		eventMatch := eventMatch(eventType, topicConfig.Events)
+		if eventMatch && ruleMatch {
+			targetListeners := globalEventNotifier.GetSNSTarget(topicConfig.TopicARN)
+			for _, listener := range targetListeners {
+				listener <- notificationEvent
+			}
+		}
+	}
+}
+
+// loads notifcation config if any for a given bucket, returns back structured notification config.
+func loadNotificationConfig(bucket string, objAPI ObjectLayer) (*notificationConfig, error) {
+	// Construct the notification config path.
+	notificationConfigPath := path.Join(bucketConfigPrefix, bucket, bucketNotificationConfig)
+	objInfo, err := objAPI.GetObjectInfo(minioMetaBucket, notificationConfigPath)
+	if err != nil {
+		// 'notification.xml' not found return 'errNoSuchNotifications'.
+		// This is default when no bucket notifications are found on the bucket.
+		switch err.(type) {
+		case ObjectNotFound:
+			return nil, errNoSuchNotifications
+		}
+		// Returns error for other errors.
+		return nil, err
+	}
+	var buffer bytes.Buffer
+	err = objAPI.GetObject(minioMetaBucket, notificationConfigPath, 0, objInfo.Size, &buffer)
+	if err != nil {
+		// 'notification.xml' not found return 'errNoSuchNotifications'.
+		// This is default when no bucket notifications are found on the bucket.
+		switch err.(type) {
+		case ObjectNotFound:
+			return nil, errNoSuchNotifications
+		}
+		// Returns error for other errors.
+		return nil, err
+	}
+
+	// Unmarshal notification bytes.
+	notificationConfigBytes := buffer.Bytes()
+	notificationCfg := &notificationConfig{}
+	if err = xml.Unmarshal(notificationConfigBytes, &notificationCfg); err != nil {
+		return nil, err
+	} // Successfully marshalled notification configuration.
+
+	// Return success.
+	return notificationCfg, nil
+}
+
+// loads all bucket notifications if present.
+func loadAllBucketNotifications(objAPI ObjectLayer) (map[string]*notificationConfig, error) {
+	// List buckets to proceed loading all notification configuration.
+	buckets, err := objAPI.ListBuckets()
+	if err != nil {
+		return nil, err
+	}
+
+	configs := make(map[string]*notificationConfig)
+
+	// Loads all bucket notifications.
+	for _, bucket := range buckets {
+		var nCfg *notificationConfig
+		nCfg, err = loadNotificationConfig(bucket.Name, objAPI)
+		if err != nil {
+			if err == errNoSuchNotifications {
+				continue
+			}
+			return nil, err
+		}
+		configs[bucket.Name] = nCfg
+	}
+
+	// Success.
+	return configs, nil
+}
+
+// Loads all queue targets, initializes each queueARNs depending on their config.
+// Each instance of queueARN registers its own logrus to communicate with the
+// queue service. QueueARN once initialized is not initialized again for the
+// same queueARN, instead previous connection is used.
+func loadAllQueueTargets() (map[string]*logrus.Logger, error) {
+	queueTargets := make(map[string]*logrus.Logger)
+	// Load all amqp targets, initialize their respective loggers.
+	for accountID, amqpN := range serverConfig.GetAMQP() {
+		if !amqpN.Enable {
+			continue
+		}
+		// Construct the queue ARN for AMQP.
+		queueARN := minioSqs + serverConfig.GetRegion() + ":" + accountID + ":" + queueTypeAMQP
+		// Queue target if already initialized we move to the next ARN.
+		_, ok := queueTargets[queueARN]
+		if ok {
+			continue
+		}
+		// Using accountID we can now initialize a new AMQP logrus instance.
+		amqpLog, err := newAMQPNotify(accountID)
+		if err != nil {
+			return nil, err
+		}
+		queueTargets[queueARN] = amqpLog
+	}
+	// Load redis targets, initialize their respective loggers.
+	for accountID, redisN := range serverConfig.GetRedis() {
+		if !redisN.Enable {
+			continue
+		}
+		// Construct the queue ARN for Redis.
+		queueARN := minioSqs + serverConfig.GetRegion() + ":" + accountID + ":" + queueTypeRedis
+		// Queue target if already initialized we move to the next ARN.
+		_, ok := queueTargets[queueARN]
+		if ok {
+			continue
+		}
+		// Using accountID we can now initialize a new Redis logrus instance.
+		redisLog, err := newRedisNotify(accountID)
+		if err != nil {
+			return nil, err
+		}
+		queueTargets[queueARN] = redisLog
+	}
+	// Load elastic targets, initialize their respective loggers.
+	for accountID, elasticN := range serverConfig.GetElasticSearch() {
+		if !elasticN.Enable {
+			continue
+		}
+		// Construct the queue ARN for Elastic.
+		queueARN := minioSqs + serverConfig.GetRegion() + ":" + accountID + ":" + queueTypeElastic
+		_, ok := queueTargets[queueARN]
+		if ok {
+			continue
+		}
+		// Using accountID we can now initialize a new ElasticSearch logrus instance.
+		elasticLog, err := newElasticNotify(accountID)
+		if err != nil {
+			return nil, err
+		}
+		queueTargets[queueARN] = elasticLog
+	}
+	// Successfully initialized queue targets.
+	return queueTargets, nil
+}
+
+// Global instance of event notification queue.
+var globalEventNotifier *eventNotifier
+
+// Initialize event notifier.
+func initEventNotifier(objAPI ObjectLayer) error {
+	if objAPI == nil {
+		return errInvalidArgument
+	}
+
+	// Read all saved bucket notifications.
+	configs, err := loadAllBucketNotifications(objAPI)
+	if err != nil {
+		return err
+	}
+
+	// Initializes all queue targets.
+	queueTargets, err := loadAllQueueTargets()
+	if err != nil {
+		return err
+	}
+
+	// Inititalize event notifier queue.
+	globalEventNotifier = &eventNotifier{
+		rwMutex:             &sync.RWMutex{},
+		notificationConfigs: configs,
+		queueTargets:        queueTargets,
+		snsTargets:          make(map[string][]chan []NotificationEvent),
+	}
+
+	return nil
+}

cmd/event-notifier_test.go

@@ -0,0 +1,133 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"reflect"
+	"testing"
+)
+
+// Tests event notify.
+func TestEventNotify(t *testing.T) {
+	ExecObjectLayerTest(t, testEventNotify)
+}
+
+func testEventNotify(obj ObjectLayer, instanceType string, t TestErrHandler) {
+	bucketName := getRandomBucketName()
+
+	// initialize the server and obtain the credentials and root.
+	// credentials are necessary to sign the HTTP request.
+	rootPath, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+	// remove the root folder after the test ends.
+	defer removeAll(rootPath)
+
+	initEventNotifier(obj)
+
+	// Notify object created event.
+	eventNotify(eventData{
+		Type:   ObjectCreatedPost,
+		Bucket: bucketName,
+		ObjInfo: ObjectInfo{
+			Bucket: bucketName,
+			Name:   "object1",
+		},
+		ReqParams: map[string]string{
+			"sourceIPAddress": "localhost:1337",
+		},
+	})
+
+	if err := globalEventNotifier.SetBucketNotificationConfig(bucketName, nil); err != errInvalidArgument {
+		t.Errorf("Expected error %s, got %s", errInvalidArgument, err)
+	}
+
+	if err := globalEventNotifier.SetBucketNotificationConfig(bucketName, &notificationConfig{}); err != nil {
+		t.Errorf("Expected error to be nil, got %s", err)
+	}
+
+	if !globalEventNotifier.IsBucketNotificationSet(bucketName) {
+		t.Errorf("Notification expected to be set, but notification not set.")
+	}
+
+	nConfig := globalEventNotifier.GetBucketNotificationConfig(bucketName)
+	if !reflect.DeepEqual(nConfig, &notificationConfig{}) {
+		t.Errorf("Mismatching notification configs.")
+	}
+
+	// Notify object created event.
+	eventNotify(eventData{
+		Type:   ObjectCreatedPost,
+		Bucket: bucketName,
+		ObjInfo: ObjectInfo{
+			Bucket: bucketName,
+			Name:   "object1",
+		},
+		ReqParams: map[string]string{
+			"sourceIPAddress": "localhost:1337",
+		},
+	})
+}
+
+// Tests various forms of inititalization of event notifier.
+func TestInitEventNotifier(t *testing.T) {
+	fs, disk, err := getSingleNodeObjectLayer()
+	if err != nil {
+		t.Fatal("Unable to initialize FS backend.", err)
+	}
+	xl, disks, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal("Unable to initialize XL backend.", err)
+	}
+
+	disks = append(disks, disk)
+	for _, d := range disks {
+		defer removeAll(d)
+	}
+
+	// Collection of test cases for inititalizing event notifier.
+	testCases := []struct {
+		objAPI  ObjectLayer
+		configs map[string]*notificationConfig
+		err     error
+	}{
+		// Test 1 - invalid arguments.
+		{
+			objAPI: nil,
+			err:    errInvalidArgument,
+		},
+		// Test 2 - valid FS object layer but no bucket notifications.
+		{
+			objAPI: fs,
+			err:    nil,
+		},
+		// Test 3 - valid XL object layer but no bucket notifications.
+		{
+			objAPI: xl,
+			err:    nil,
+		},
+	}
+
+	// Validate if event notifier is properly initialized.
+	for i, testCase := range testCases {
+		err = initEventNotifier(testCase.objAPI)
+		if err != testCase.err {
+			t.Errorf("Test %d: Expected %s, but got: %s", i+1, testCase.err, err)
+		}
+	}
+}

cmd/format-config-v1.go

@@ -0,0 +1,875 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"reflect"
+	"sync"
+)
+
+// fsFormat - structure holding 'fs' format.
+type fsFormat struct {
+	Version string `json:"version"`
+}
+
+// xlFormat - structure holding 'xl' format.
+type xlFormat struct {
+	Version string `json:"version"` // Version of 'xl' format.
+	Disk    string `json:"disk"`    // Disk field carries assigned disk uuid.
+	// JBOD field carries the input disk order generated the first
+	// time when fresh disks were supplied.
+	JBOD []string `json:"jbod"`
+}
+
+// formatConfigV1 - structure holds format config version '1'.
+type formatConfigV1 struct {
+	Version string `json:"version"` // Version of the format config.
+	// Format indicates the backend format type, supports two values 'xl' and 'fs'.
+	Format string    `json:"format"`
+	FS     *fsFormat `json:"fs,omitempty"` // FS field holds fs format.
+	XL     *xlFormat `json:"xl,omitempty"` // XL field holds xl format.
+}
+
+/*
+
+All disks online
+-----------------
+- All Unformatted - format all and return success.
+- Some Unformatted - format all and return success.
+- Any JBOD inconsistent - return failure // Requires deep inspection, phase2.
+- Some are corrupt (missing format.json) - return failure  // Requires deep inspection, phase2.
+- Any unrecognized disks - return failure
+
+Some disks are offline and we have quorum.
+-----------------
+- Some unformatted - no heal, return success.
+- Any JBOD inconsistent - return failure // Requires deep inspection, phase2.
+- Some are corrupt (missing format.json) - return failure  // Requires deep inspection, phase2.
+- Any unrecognized disks - return failure
+
+No read quorum
+-----------------
+failure for all cases.
+
+// Pseudo code for managing `format.json`.
+
+// Generic checks.
+if (no quorum) return error
+if (any disk is corrupt) return error // phase2
+if (jbod inconsistent) return error // phase2
+if (disks not recognized) // Always error.
+
+// Specific checks.
+if (all disks online)
+  if (all disks return format.json)
+     if (jbod consistent)
+        if (all disks recognized)
+          return
+  else
+     if (all disks return format.json not found)
+        (initialize format)
+        return
+     else (some disks return format.json not found)
+        (heal format)
+        return
+     fi
+   fi
+else // No healing at this point forward, some disks are offline or dead.
+   if (some disks return format.json not found)
+      if (with force)
+         // Offline disks are marked as dead.
+         (heal format) // Offline disks should be marked as dead.
+         return success
+      else (without force)
+         // --force is necessary to heal few drives, because some drives
+         // are offline. Offline disks will be marked as dead.
+         return error
+      fi
+fi
+*/
+
+// error returned when some disks are found to be unformatted.
+var errSomeDiskUnformatted = errors.New("some disks are found to be unformatted")
+
+// error returned when some disks are offline.
+var errSomeDiskOffline = errors.New("some disks are offline")
+
+// errDiskOrderMismatch - returned when disk UUID is not in consistent JBOD order.
+var errDiskOrderMismatch = errors.New("disk order mismatch")
+
+// Returns error slice into understandable errors.
+func reduceFormatErrs(errs []error, diskCount int) (err error) {
+	var errUnformattedDiskCount = 0
+	var errDiskNotFoundCount = 0
+	var errCorruptedFormatCount = 0
+	for _, dErr := range errs {
+		if dErr == errUnformattedDisk {
+			errUnformattedDiskCount++
+		} else if dErr == errDiskNotFound {
+			errDiskNotFoundCount++
+		} else if dErr == errCorruptedFormat {
+			errCorruptedFormatCount++
+		}
+	}
+	if errCorruptedFormatCount > 0 {
+		return errCorruptedFormat
+	}
+	// Unformatted disks found, we need to figure out if any disks are offline.
+	if errUnformattedDiskCount > 0 {
+		// Returns errUnformattedDisk if all disks report unFormattedDisk.
+		if errUnformattedDiskCount < diskCount {
+			if errDiskNotFoundCount > 0 {
+				// Only some disks are fresh but some disks are offline as well.
+				return errSomeDiskOffline
+			}
+			// Some disks are fresh disks an unformatted, not disks are offline.
+			return errSomeDiskUnformatted
+		}
+		// All disks returned unformatted, all disks must be fresh.
+		return errUnformattedDisk
+	}
+	// No unformatted disks found no need to handle disk not found case, return success here.
+	return nil
+}
+
+// loadAllFormats - load all format config from all input disks in parallel.
+func loadAllFormats(bootstrapDisks []StorageAPI) ([]*formatConfigV1, []error) {
+	// Initialize sync waitgroup.
+	var wg = &sync.WaitGroup{}
+
+	// Initialize list of errors.
+	var sErrs = make([]error, len(bootstrapDisks))
+
+	// Initialize format configs.
+	var formatConfigs = make([]*formatConfigV1, len(bootstrapDisks))
+
+	// Make a volume entry on all underlying storage disks.
+	for index, disk := range bootstrapDisks {
+		if disk == nil {
+			sErrs[index] = errDiskNotFound
+			continue
+		}
+		wg.Add(1)
+		// Make a volume inside a go-routine.
+		go func(index int, disk StorageAPI) {
+			defer wg.Done()
+			formatConfig, lErr := loadFormat(disk)
+			if lErr != nil {
+				sErrs[index] = lErr
+				return
+			}
+			formatConfigs[index] = formatConfig
+		}(index, disk)
+	}
+
+	// Wait for all make vol to finish.
+	wg.Wait()
+
+	for _, err := range sErrs {
+		if err != nil {
+			// Return all formats and errors.
+			return formatConfigs, sErrs
+		}
+	}
+	// Return all formats and nil
+	return formatConfigs, nil
+}
+
+// genericFormatCheck - validates and returns error.
+// if (no quorum) return error
+// if (any disk is corrupt) return error // phase2
+// if (jbod inconsistent) return error // phase2
+// if (disks not recognized) // Always error.
+func genericFormatCheck(formatConfigs []*formatConfigV1, sErrs []error) (err error) {
+	// Calculate the errors.
+	var (
+		errCorruptFormatCount = 0
+		errCount              = 0
+	)
+
+	// Through all errors calculate the actual errors.
+	for _, lErr := range sErrs {
+		if lErr == nil {
+			continue
+		}
+		// These errors are good conditions, means disk is online.
+		if lErr == errUnformattedDisk || lErr == errVolumeNotFound {
+			continue
+		}
+		if lErr == errCorruptedFormat {
+			errCorruptFormatCount++
+		} else {
+			errCount++
+		}
+	}
+
+	// Calculate read quorum.
+	readQuorum := len(formatConfigs)/2 + 1
+
+	// Validate the err count under tolerant limit.
+	if errCount > len(formatConfigs)-readQuorum {
+		return errXLReadQuorum
+	}
+
+	// Check if number of corrupted format under quorum
+	if errCorruptFormatCount > len(formatConfigs)-readQuorum {
+		return errCorruptedFormat
+	}
+
+	// Validates if format and JBOD are consistent across all disks.
+	if err = checkFormatXL(formatConfigs); err != nil {
+		return err
+	}
+
+	// Success..
+	return nil
+}
+
+// isSavedUUIDInOrder - validates if disk uuid is present and valid in all
+// available format config JBOD. This function also validates if the disk UUID
+// is always available on all JBOD under the same order.
+func isSavedUUIDInOrder(uuid string, formatConfigs []*formatConfigV1) bool {
+	var orderIndexes []int
+	// Validate each for format.json for relevant uuid.
+	for _, formatConfig := range formatConfigs {
+		if formatConfig == nil {
+			continue
+		}
+		// Validate if UUID is present in JBOD.
+		uuidIndex := findDiskIndex(uuid, formatConfig.XL.JBOD)
+		if uuidIndex == -1 {
+			// UUID not found.
+			errorIf(errDiskNotFound, "Disk %s not found in JBOD list", uuid)
+			return false
+		}
+		// Save the position of UUID present in JBOD.
+		orderIndexes = append(orderIndexes, uuidIndex+1)
+	}
+	// Once uuid is found, verify if the uuid
+	// present in same order across all format configs.
+	prevOrderIndex := orderIndexes[0]
+	for _, orderIndex := range orderIndexes {
+		if prevOrderIndex != orderIndex {
+			errorIf(errDiskOrderMismatch, "Disk %s is in wrong order wanted %d, saw %d ", uuid, prevOrderIndex, orderIndex)
+			return false
+		}
+	}
+	// Returns success, when we have verified if uuid
+	// is consistent and valid across all format configs.
+	return true
+}
+
+// checkDisksConsistency - checks if all disks are consistent with all JBOD entries on all disks.
+func checkDisksConsistency(formatConfigs []*formatConfigV1) error {
+	var disks = make([]string, len(formatConfigs))
+	// Collect currently available disk uuids.
+	for index, formatConfig := range formatConfigs {
+		if formatConfig == nil {
+			disks[index] = ""
+			continue
+		}
+		disks[index] = formatConfig.XL.Disk
+	}
+	// Validate collected uuids and verify JBOD.
+	for _, uuid := range disks {
+		if uuid == "" {
+			continue
+		}
+		// Is uuid present on all JBOD ?.
+		if !isSavedUUIDInOrder(uuid, formatConfigs) {
+			return fmt.Errorf("%s disk not found in JBOD", uuid)
+		}
+	}
+	return nil
+}
+
+// checkJBODConsistency - validate xl jbod order if they are consistent.
+func checkJBODConsistency(formatConfigs []*formatConfigV1) error {
+	var sentinelJBOD []string
+	// Extract first valid JBOD.
+	for _, format := range formatConfigs {
+		if format == nil {
+			continue
+		}
+		sentinelJBOD = format.XL.JBOD
+		break
+	}
+	for _, format := range formatConfigs {
+		if format == nil {
+			continue
+		}
+		currentJBOD := format.XL.JBOD
+		if !reflect.DeepEqual(sentinelJBOD, currentJBOD) {
+			return errors.New("Inconsistent JBOD found.")
+		}
+	}
+	return nil
+}
+
+// findDiskIndex returns position of disk in JBOD.
+func findDiskIndex(disk string, jbod []string) int {
+	for index, uuid := range jbod {
+		if uuid == disk {
+			return index
+		}
+	}
+	return -1
+}
+
+// reorderDisks - reorder disks in JBOD order.
+func reorderDisks(bootstrapDisks []StorageAPI, formatConfigs []*formatConfigV1) ([]StorageAPI, error) {
+	var savedJBOD []string
+	for _, format := range formatConfigs {
+		if format == nil {
+			continue
+		}
+		savedJBOD = format.XL.JBOD
+		break
+	}
+	// Pick the first JBOD list to verify the order and construct new set of disk slice.
+	var newDisks = make([]StorageAPI, len(bootstrapDisks))
+	for fIndex, format := range formatConfigs {
+		if format == nil {
+			continue
+		}
+		jIndex := findDiskIndex(format.XL.Disk, savedJBOD)
+		if jIndex == -1 {
+			return nil, errors.New("Unrecognized uuid " + format.XL.Disk + " found")
+		}
+		newDisks[jIndex] = bootstrapDisks[fIndex]
+	}
+	return newDisks, nil
+}
+
+// loadFormat - loads format.json from disk.
+func loadFormat(disk StorageAPI) (format *formatConfigV1, err error) {
+	buf, err := disk.ReadAll(minioMetaBucket, formatConfigFile)
+	if err != nil {
+		// 'file not found' and 'volume not found' as
+		// same. 'volume not found' usually means its a fresh disk.
+		if err == errFileNotFound || err == errVolumeNotFound {
+			var vols []VolInfo
+			vols, err = disk.ListVols()
+			if err != nil {
+				return nil, err
+			}
+			if len(vols) > 1 {
+				// 'format.json' not found, but we found user data.
+				return nil, errCorruptedFormat
+			}
+			// No other data found, its a fresh disk.
+			return nil, errUnformattedDisk
+		}
+		return nil, err
+	}
+
+	// Try to decode format json into formatConfigV1 struct.
+	format = &formatConfigV1{}
+	if err = json.Unmarshal(buf, format); err != nil {
+		return nil, err
+	}
+
+	// Success.
+	return format, nil
+}
+
+// isFormatNotFound - returns true if all `format.json` are not
+// found on all disks.
+func isFormatNotFound(formats []*formatConfigV1) bool {
+	for _, format := range formats {
+		// One of the `format.json` is found.
+		if format != nil {
+			return false
+		}
+	}
+	// All format.json missing, success.
+	return true
+}
+
+// isFormatFound - returns true if all input formats are found on
+// all disks.
+func isFormatFound(formats []*formatConfigV1) bool {
+	for _, format := range formats {
+		// One of `format.json` is not found.
+		if format == nil {
+			return false
+		}
+	}
+	// All format.json present, success.
+	return true
+}
+
+// Heals any missing format.json on the drives. Returns error only for unexpected errors
+// as regular errors can be ignored since there might be enough quorum to be operational.
+// Heals only fresh disks.
+func healFormatXLFreshDisks(storageDisks []StorageAPI) error {
+	formatConfigs := make([]*formatConfigV1, len(storageDisks))
+	var referenceConfig *formatConfigV1
+	// Loads `format.json` from all disks.
+	for index, disk := range storageDisks {
+		// Disk not found or ignored is a valid case.
+		if disk == nil {
+			// Return nil, one of the disk is offline.
+			return nil
+		}
+		formatXL, err := loadFormat(disk)
+		if err != nil {
+			if err == errUnformattedDisk {
+				// format.json is missing, should be healed.
+				continue
+			} else if err == errDiskNotFound { // Is a valid case we
+				// can proceed without healing.
+				return nil
+			}
+			// Return error for unsupported errors.
+			return err
+		} // Success.
+		formatConfigs[index] = formatXL
+	}
+
+	// All `format.json` has been read successfully, previously completed.
+	if isFormatFound(formatConfigs) {
+		// Return success.
+		return nil
+	}
+
+	// All disks are fresh, format.json will be written by initFormatXL()
+	if isFormatNotFound(formatConfigs) {
+		return initFormatXL(storageDisks)
+	}
+
+	// Validate format configs for consistency in JBOD and disks.
+	if err := checkFormatXL(formatConfigs); err != nil {
+		return err
+	}
+
+	if referenceConfig == nil {
+		// This config will be used to update the drives missing format.json.
+		for _, formatConfig := range formatConfigs {
+			if formatConfig == nil {
+				continue
+			}
+			referenceConfig = formatConfig
+			break
+		}
+	}
+
+	// Collect new JBOD.
+	newJBOD := referenceConfig.XL.JBOD
+
+	// Reorder the disks based on the JBOD order.
+	orderedDisks, err := reorderDisks(storageDisks, formatConfigs)
+	if err != nil {
+		return err
+	}
+
+	// From ordered disks fill the UUID position.
+	for index, disk := range orderedDisks {
+		if disk == nil {
+			newJBOD[index] = getUUID()
+		}
+	}
+
+	// Collect new format configs.
+	var newFormatConfigs = make([]*formatConfigV1, len(orderedDisks))
+
+	// Collect new format configs that need to be written.
+	for index := range orderedDisks {
+		// New configs are generated since we are going
+		// to re-populate across all disks.
+		config := &formatConfigV1{
+			Version: referenceConfig.Version,
+			Format:  referenceConfig.Format,
+			XL: &xlFormat{
+				Version: referenceConfig.XL.Version,
+				Disk:    newJBOD[index],
+				JBOD:    newJBOD,
+			},
+		}
+		newFormatConfigs[index] = config
+	}
+
+	// Fill in the missing disk back from format configs.
+	// We need to make sure we have kept the previous order
+	// and allowed fresh disks to be arranged anywhere.
+	// Following block facilitates to put fresh disks.
+	for index, format := range formatConfigs {
+		// Format is missing so we go through ordered disks.
+		if format == nil {
+			// At this point when disk is missing the fresh disk
+			// in the stack get it back from storageDisks.
+			for oIndex, disk := range orderedDisks {
+				if disk == nil {
+					orderedDisks[oIndex] = storageDisks[index]
+					break
+				}
+			}
+		}
+	}
+
+	// Save new `format.json` across all disks, in JBOD order.
+	return saveFormatXL(orderedDisks, newFormatConfigs)
+}
+
+// Disks from storageDiks are put in assignedDisks if found in orderedDisks and in unAssignedDisks otherwise
+func splitDisksByUse(storageDisks, orderedDisks []StorageAPI) (assignedDisks []StorageAPI, unAssignedDisks []StorageAPI) {
+	// Populate unAssignDisks
+	for i := range storageDisks {
+		found := false
+		for j := range orderedDisks {
+			if storageDisks[i] == orderedDisks[j] {
+				found = true
+				assignedDisks = append(assignedDisks, storageDisks[i])
+				break
+			}
+		}
+		if !found {
+			unAssignedDisks = append(unAssignedDisks, storageDisks[i])
+		}
+	}
+	return assignedDisks, unAssignedDisks
+}
+
+// Inspect the content of all disks to guess the right order according to the format files.
+// The right order is represented in orderedDisks
+func reorderDisksByInspection(orderedDisks, storageDisks []StorageAPI, formatConfigs []*formatConfigV1) ([]StorageAPI, error) {
+	for index, format := range formatConfigs {
+		if format != nil {
+			continue
+		}
+		vols, err := storageDisks[index].ListVols()
+		if err != nil {
+			return nil, err
+		}
+		if len(vols) == 0 {
+			continue
+		}
+		volName := ""
+		// Avoid picking minioMetaBucket because ListVols() returns a non ordered list
+		for i := range vols {
+			if vols[i].Name != minioMetaBucket {
+				volName = vols[i].Name
+				break
+			}
+		}
+		if volName == "" {
+			continue
+		}
+		objects, err := storageDisks[index].ListDir(volName, "")
+		if err != nil {
+			return nil, err
+		}
+		if len(objects) == 0 {
+			continue
+		}
+		xlData, err := readXLMeta(storageDisks[index], volName, objects[0])
+		if err != nil {
+			if err == errFileNotFound {
+				continue
+			}
+			return nil, err
+		}
+		diskIndex := -1
+		for i, d := range xlData.Erasure.Distribution {
+			if d == xlData.Erasure.Index {
+				diskIndex = i
+			}
+		}
+		// Check for found results
+		if diskIndex == -1 || orderedDisks[diskIndex] != nil {
+			// Some inconsistent data are found, exit immediately.
+			return nil, errCorruptedFormat
+		}
+		orderedDisks[diskIndex] = storageDisks[index]
+	}
+	return orderedDisks, nil
+}
+
+// Heals corrupted format json in all disks
+func healFormatXLCorruptedDisks(storageDisks []StorageAPI) error {
+	formatConfigs := make([]*formatConfigV1, len(storageDisks))
+	var referenceConfig *formatConfigV1
+
+	// Loads `format.json` from all disks.
+	for index, disk := range storageDisks {
+		// Disk not found or ignored is a valid case.
+		if disk == nil {
+			// Return nil, one of the disk is offline.
+			return nil
+		}
+		formatXL, err := loadFormat(disk)
+		if err != nil {
+			if err == errUnformattedDisk || err == errCorruptedFormat {
+				// format.json is missing or corrupted, should be healed.
+				continue
+			} else if err == errDiskNotFound { // Is a valid case we
+				// can proceed without healing.
+				return nil
+			}
+			// Return error for unsupported errors.
+			return err
+		} // Success.
+		formatConfigs[index] = formatXL
+	}
+
+	// All `format.json` has been read successfully, previously completed.
+	if isFormatFound(formatConfigs) {
+		// Return success.
+		return nil
+	}
+
+	// All disks are fresh, format.json will be written by initFormatXL()
+	if isFormatNotFound(formatConfigs) {
+		return initFormatXL(storageDisks)
+	}
+
+	// Validate format configs for consistency in JBOD and disks.
+	if err := checkFormatXL(formatConfigs); err != nil {
+		return err
+	}
+
+	if referenceConfig == nil {
+		// This config will be used to update the drives missing format.json.
+		for _, formatConfig := range formatConfigs {
+			if formatConfig == nil {
+				continue
+			}
+			referenceConfig = formatConfig
+			break
+		}
+	}
+
+	// Collect new JBOD.
+	newJBOD := referenceConfig.XL.JBOD
+
+	// Reorder the disks based on the JBOD order.
+	orderedDisks, err := reorderDisks(storageDisks, formatConfigs)
+	if err != nil {
+		return err
+	}
+
+	// From ordered disks fill the UUID position.
+	for index, disk := range orderedDisks {
+		if disk == nil {
+			newJBOD[index] = getUUID()
+		}
+	}
+
+	// For disks with corrupted formats, inspect the disks contents to guess the disks order
+	orderedDisks, err = reorderDisksByInspection(orderedDisks, storageDisks, formatConfigs)
+	if err != nil {
+		return err
+	}
+
+	// At this stage, all disks with corrupted formats but with objects inside found their way.
+	// Now take care of unformatted disks, which are the `unAssignedDisks`
+	_, unAssignedDisks := splitDisksByUse(storageDisks, orderedDisks)
+
+	// Assign unassigned disks to nil elements in orderedDisks
+	for i, disk := range orderedDisks {
+		if disk == nil && len(unAssignedDisks) > 0 {
+			orderedDisks[i] = unAssignedDisks[0]
+			unAssignedDisks = unAssignedDisks[1:]
+		}
+	}
+
+	// Collect new format configs.
+	var newFormatConfigs = make([]*formatConfigV1, len(orderedDisks))
+
+	// Collect new format configs that need to be written.
+	for index := range orderedDisks {
+		// New configs are generated since we are going
+		// to re-populate across all disks.
+		config := &formatConfigV1{
+			Version: referenceConfig.Version,
+			Format:  referenceConfig.Format,
+			XL: &xlFormat{
+				Version: referenceConfig.XL.Version,
+				Disk:    newJBOD[index],
+				JBOD:    newJBOD,
+			},
+		}
+		newFormatConfigs[index] = config
+	}
+
+	// Save new `format.json` across all disks, in JBOD order.
+	return saveFormatXL(orderedDisks, newFormatConfigs)
+}
+
+// loadFormatXL - loads XL `format.json` and returns back properly
+// ordered storage slice based on `format.json`.
+func loadFormatXL(bootstrapDisks []StorageAPI) (disks []StorageAPI, err error) {
+	var unformattedDisksFoundCnt = 0
+	var diskNotFoundCount = 0
+	formatConfigs := make([]*formatConfigV1, len(bootstrapDisks))
+
+	// Try to load `format.json` bootstrap disks.
+	for index, disk := range bootstrapDisks {
+		if disk == nil {
+			diskNotFoundCount++
+			continue
+		}
+		var formatXL *formatConfigV1
+		formatXL, err = loadFormat(disk)
+		if err != nil {
+			if err == errUnformattedDisk {
+				unformattedDisksFoundCnt++
+				continue
+			} else if err == errDiskNotFound {
+				diskNotFoundCount++
+				continue
+			}
+			return nil, err
+		}
+		// Save valid formats.
+		formatConfigs[index] = formatXL
+	}
+
+	// If all disks indicate that 'format.json' is not available return 'errUnformattedDisk'.
+	if unformattedDisksFoundCnt > len(bootstrapDisks)-(len(bootstrapDisks)/2+1) {
+		return nil, errUnformattedDisk
+	} else if diskNotFoundCount == len(bootstrapDisks) {
+		return nil, errDiskNotFound
+	} else if diskNotFoundCount > len(bootstrapDisks)-(len(bootstrapDisks)/2+1) {
+		return nil, errXLReadQuorum
+	}
+
+	// Validate the format configs read are correct.
+	if err = checkFormatXL(formatConfigs); err != nil {
+		return nil, err
+	}
+	// Erasure code requires disks to be presented in the same order each time.
+	return reorderDisks(bootstrapDisks, formatConfigs)
+}
+
+// checkFormatXL - verifies if format.json format is intact.
+func checkFormatXL(formatConfigs []*formatConfigV1) error {
+	for _, formatXL := range formatConfigs {
+		if formatXL == nil {
+			continue
+		}
+		// Validate format version and format type.
+		if formatXL.Version != "1" {
+			return fmt.Errorf("Unsupported version of backend format [%s] found.", formatXL.Version)
+		}
+		if formatXL.Format != "xl" {
+			return fmt.Errorf("Unsupported backend format [%s] found.", formatXL.Format)
+		}
+		if formatXL.XL.Version != "1" {
+			return fmt.Errorf("Unsupported XL backend format found [%s]", formatXL.XL.Version)
+		}
+		if len(formatConfigs) != len(formatXL.XL.JBOD) {
+			return fmt.Errorf("Number of disks %d did not match the backend format %d", len(formatConfigs), len(formatXL.XL.JBOD))
+		}
+	}
+	if err := checkJBODConsistency(formatConfigs); err != nil {
+		return err
+	}
+	return checkDisksConsistency(formatConfigs)
+}
+
+// saveFormatXL - populates `format.json` on disks in its order.
+func saveFormatXL(storageDisks []StorageAPI, formats []*formatConfigV1) error {
+	var errs = make([]error, len(storageDisks))
+	var wg = &sync.WaitGroup{}
+	// Write `format.json` to all disks.
+	for index, disk := range storageDisks {
+		if disk == nil {
+			continue
+		}
+		wg.Add(1)
+		go func(index int, disk StorageAPI, format *formatConfigV1) {
+			defer wg.Done()
+
+			// Marshal and write to disk.
+			formatBytes, err := json.Marshal(format)
+			if err != nil {
+				errs[index] = err
+				return
+			}
+
+			// Purge any existing temporary file, okay to ignore errors here.
+			disk.DeleteFile(minioMetaBucket, formatConfigFileTmp)
+
+			// Append file `format.json.tmp`.
+			if err = disk.AppendFile(minioMetaBucket, formatConfigFileTmp, formatBytes); err != nil {
+				errs[index] = err
+				return
+			}
+			// Rename file `format.json.tmp` --> `format.json`.
+			if err = disk.RenameFile(minioMetaBucket, formatConfigFileTmp, minioMetaBucket, formatConfigFile); err != nil {
+				errs[index] = err
+				return
+			}
+		}(index, disk, formats[index])
+	}
+
+	// Wait for the routines to finish.
+	wg.Wait()
+
+	// Validate if we encountered any errors, return quickly.
+	for _, err := range errs {
+		if err != nil {
+			// Failure.
+			return err
+		}
+	}
+
+	// Success.
+	return nil
+}
+
+// initFormatXL - save XL format configuration on all disks.
+func initFormatXL(storageDisks []StorageAPI) (err error) {
+	// Initialize jbods.
+	var jbod = make([]string, len(storageDisks))
+
+	// Initialize formats.
+	var formats = make([]*formatConfigV1, len(storageDisks))
+
+	// Initialize `format.json`.
+	for index, disk := range storageDisks {
+		if disk == nil {
+			continue
+		}
+		// Allocate format config.
+		formats[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    getUUID(),
+			},
+		}
+		jbod[index] = formats[index].XL.Disk
+	}
+
+	// Update the jbod entries.
+	for index, disk := range storageDisks {
+		if disk == nil {
+			continue
+		}
+		// Save jbod.
+		formats[index].XL.JBOD = jbod
+	}
+
+	// Save formats `format.json` across all disks.
+	return saveFormatXL(storageDisks, formats)
+}

cmd/format-config-v1_test.go

@@ -0,0 +1,943 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+	"testing"
+)
+
+// generates a valid format.json for XL backend.
+func genFormatXLValid() []*formatConfigV1 {
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	return formatConfigs
+}
+
+// generates a invalid format.json version for XL backend.
+func genFormatXLInvalidVersion() []*formatConfigV1 {
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	// Corrupt version numbers.
+	formatConfigs[0].Version = "2"
+	formatConfigs[3].Version = "-1"
+	return formatConfigs
+}
+
+// generates a invalid format.json version for XL backend.
+func genFormatXLInvalidFormat() []*formatConfigV1 {
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	// Corrupt version numbers.
+	formatConfigs[0].Format = "lx"
+	formatConfigs[3].Format = "lx"
+	return formatConfigs
+}
+
+// generates a invalid format.json version for XL backend.
+func genFormatXLInvalidXLVersion() []*formatConfigV1 {
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	// Corrupt version numbers.
+	formatConfigs[0].XL.Version = "10"
+	formatConfigs[3].XL.Version = "-1"
+	return formatConfigs
+}
+
+// generates a invalid format.json version for XL backend.
+func genFormatXLInvalidJBODCount() []*formatConfigV1 {
+	jbod := make([]string, 7)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	return formatConfigs
+}
+
+// generates a invalid format.json JBOD for XL backend.
+func genFormatXLInvalidJBOD() []*formatConfigV1 {
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	// Corrupt JBOD entries on disk 6 and disk 8.
+	formatConfigs[5].XL.JBOD = jbod
+	formatConfigs[7].XL.JBOD = jbod
+	return formatConfigs
+}
+
+// generates a invalid format.json Disk UUID for XL backend.
+func genFormatXLInvalidDisks() []*formatConfigV1 {
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	// Make disk 5 and disk 8 have inconsistent disk uuid's.
+	formatConfigs[4].XL.Disk = getUUID()
+	formatConfigs[7].XL.Disk = getUUID()
+	return formatConfigs
+}
+
+// generates a invalid format.json Disk UUID in wrong order for XL backend.
+func genFormatXLInvalidDisksOrder() []*formatConfigV1 {
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	// Re order jbod for failure case.
+	var jbod1 = make([]string, 8)
+	for i, j := range jbod {
+		jbod1[i] = j
+	}
+	jbod1[1], jbod1[2] = jbod[2], jbod[1]
+	formatConfigs[2].XL.JBOD = jbod1
+	return formatConfigs
+}
+
+func prepareFormatXLHealFreshDisks(obj ObjectLayer) ([]StorageAPI, error) {
+
+	var err error
+	xl := obj.(xlObjects)
+
+	err = obj.MakeBucket("bucket")
+	if err != nil {
+		return []StorageAPI{}, err
+	}
+
+	bucket := "bucket"
+	object := "object"
+
+	_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+	if err != nil {
+		return []StorageAPI{}, err
+	}
+
+	// Remove the content of export dir 10 but preserve .minio.sys because it is automatically
+	// created when minio starts
+	for i := 3; i <= 5; i++ {
+		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+			return []StorageAPI{}, err
+		}
+		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "tmp"); err != nil {
+			return []StorageAPI{}, err
+		}
+		if err = xl.storageDisks[i].DeleteFile(bucket, object+"/xl.json"); err != nil {
+			return []StorageAPI{}, err
+		}
+		if err = xl.storageDisks[i].DeleteFile(bucket, object+"/part.1"); err != nil {
+			return []StorageAPI{}, err
+		}
+		if err = xl.storageDisks[i].DeleteVol(bucket); err != nil {
+			return []StorageAPI{}, err
+		}
+	}
+
+	permutedStorageDisks := []StorageAPI{xl.storageDisks[1], xl.storageDisks[4],
+		xl.storageDisks[2], xl.storageDisks[8], xl.storageDisks[6], xl.storageDisks[7],
+		xl.storageDisks[0], xl.storageDisks[15], xl.storageDisks[13], xl.storageDisks[14],
+		xl.storageDisks[3], xl.storageDisks[10], xl.storageDisks[12], xl.storageDisks[9],
+		xl.storageDisks[5], xl.storageDisks[11]}
+
+	return permutedStorageDisks, nil
+
+}
+
+func TestFormatXLHealFreshDisks(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Error(err)
+	}
+
+	storageDisks, err := prepareFormatXLHealFreshDisks(obj)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Start healing disks
+	err = healFormatXLFreshDisks(storageDisks)
+	if err != nil {
+		t.Fatal("healing corrupted disk failed: ", err)
+	}
+
+	// Load again XL format.json to validate it
+	_, err = loadFormatXL(storageDisks)
+	if err != nil {
+		t.Fatal("loading healed disk failed: ", err)
+	}
+
+	// Clean all
+	removeRoots(fsDirs)
+}
+
+func TestFormatXLHealFreshDisksErrorExpected(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Error(err)
+	}
+
+	storageDisks, err := prepareFormatXLHealFreshDisks(obj)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for i := 0; i < 16; i++ {
+		d := storageDisks[i].(*posix)
+		storageDisks[i] = &naughtyDisk{disk: d, defaultErr: errDiskNotFound}
+	}
+
+	// Load again XL format.json to validate it
+	_, err = loadFormatXL(storageDisks)
+	if err == nil {
+		t.Fatal("loading format disk error")
+	}
+
+	storageDisks[3] = nil
+	err = healFormatXLFreshDisks(storageDisks)
+	if err != nil {
+		t.Fatal("didn't get nil when one disk is offline")
+	}
+
+	// Clean all
+	removeRoots(fsDirs)
+}
+
+// Simulate XL disks creation, delete some format.json and remove the content of
+// a given disk to test healing a corrupted disk
+func TestFormatXLHealCorruptedDisks(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	xl := obj.(xlObjects)
+
+	err = obj.MakeBucket("bucket")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bucket := "bucket"
+	object := "object"
+
+	_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Now, remove two format files.. Load them and reorder
+	if err = xl.storageDisks[3].DeleteFile(".minio.sys", "format.json"); err != nil {
+		t.Fatal(err)
+	}
+	if err = xl.storageDisks[11].DeleteFile(".minio.sys", "format.json"); err != nil {
+		t.Fatal(err)
+	}
+
+	// Remove the content of export dir 10 but preserve .minio.sys because it is automatically
+	// created when minio starts
+	if err = xl.storageDisks[10].DeleteFile(".minio.sys", "format.json"); err != nil {
+		t.Fatal(err)
+	}
+	if err = xl.storageDisks[10].DeleteFile(".minio.sys", "tmp"); err != nil {
+		t.Fatal(err)
+	}
+	if err = xl.storageDisks[10].DeleteFile(bucket, object+"/xl.json"); err != nil {
+		t.Fatal(err)
+	}
+	if err = xl.storageDisks[10].DeleteFile(bucket, object+"/part.1"); err != nil {
+		t.Fatal(err)
+	}
+	if err = xl.storageDisks[10].DeleteVol(bucket); err != nil {
+		t.Fatal(err)
+	}
+
+	permutedStorageDisks := []StorageAPI{xl.storageDisks[1], xl.storageDisks[4],
+		xl.storageDisks[2], xl.storageDisks[8], xl.storageDisks[6], xl.storageDisks[7],
+		xl.storageDisks[0], xl.storageDisks[15], xl.storageDisks[13], xl.storageDisks[14],
+		xl.storageDisks[3], xl.storageDisks[10], xl.storageDisks[12], xl.storageDisks[9],
+		xl.storageDisks[5], xl.storageDisks[11]}
+
+	// Start healing disks
+	err = healFormatXLCorruptedDisks(permutedStorageDisks)
+	if err != nil {
+		t.Fatal("healing corrupted disk failed: ", err)
+	}
+
+	// Load again XL format.json to validate it
+	_, err = loadFormatXL(permutedStorageDisks)
+	if err != nil {
+		t.Fatal("loading healed disk failed: ", err)
+	}
+
+	// Clean all
+	removeRoots(fsDirs)
+}
+
+// Test on ReorderByInspection by simulating creating disks and removing
+// some of format.json
+func TestFormatXLReorderByInspection(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	xl := obj.(xlObjects)
+
+	err = obj.MakeBucket("bucket")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bucket := "bucket"
+	object := "object"
+
+	_, err = obj.PutObject(bucket, object, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Now, remove two format files.. Load them and reorder
+	if err = xl.storageDisks[3].DeleteFile(".minio.sys", "format.json"); err != nil {
+		t.Fatal(err)
+	}
+	if err = xl.storageDisks[5].DeleteFile(".minio.sys", "format.json"); err != nil {
+		t.Fatal(err)
+	}
+
+	permutedStorageDisks := []StorageAPI{xl.storageDisks[1], xl.storageDisks[4],
+		xl.storageDisks[2], xl.storageDisks[8], xl.storageDisks[6], xl.storageDisks[7],
+		xl.storageDisks[0], xl.storageDisks[15], xl.storageDisks[13], xl.storageDisks[14],
+		xl.storageDisks[3], xl.storageDisks[10], xl.storageDisks[12], xl.storageDisks[9],
+		xl.storageDisks[5], xl.storageDisks[11]}
+
+	permutedFormatConfigs, _ := loadAllFormats(permutedStorageDisks)
+
+	orderedDisks, err := reorderDisks(permutedStorageDisks, permutedFormatConfigs)
+	if err != nil {
+		t.Fatal("error reordering disks\n")
+	}
+
+	orderedDisks, err = reorderDisksByInspection(orderedDisks, permutedStorageDisks, permutedFormatConfigs)
+	if err != nil {
+		t.Fatal("failed to reorder disk by inspection")
+	}
+
+	// Check disks reordering
+	for i := 0; i <= 15; i++ {
+		if orderedDisks[i] == nil && i != 3 && i != 5 {
+			t.Fatal("should not be nil")
+		}
+		if orderedDisks[i] != nil && orderedDisks[i] != xl.storageDisks[i] {
+			t.Fatal("Disks were not ordered correctly.")
+		}
+	}
+
+	removeRoots(fsDirs)
+}
+
+// Wrapper for calling FormatXL tests - currently validates
+//  - valid format
+//  - unrecognized version number
+//  - unrecognized format tag
+//  - unrecognized xl version
+//  - wrong number of JBOD entries
+//  - invalid JBOD
+//  - invalid Disk uuid
+func TestFormatXL(t *testing.T) {
+	formatInputCases := [][]*formatConfigV1{
+		genFormatXLValid(),
+		genFormatXLInvalidVersion(),
+		genFormatXLInvalidFormat(),
+		genFormatXLInvalidXLVersion(),
+		genFormatXLInvalidJBODCount(),
+		genFormatXLInvalidJBOD(),
+		genFormatXLInvalidDisks(),
+		genFormatXLInvalidDisksOrder(),
+	}
+	testCases := []struct {
+		formatConfigs []*formatConfigV1
+		shouldPass    bool
+	}{
+		{
+			formatConfigs: formatInputCases[0],
+			shouldPass:    true,
+		},
+		{
+			formatConfigs: formatInputCases[1],
+			shouldPass:    false,
+		},
+		{
+			formatConfigs: formatInputCases[2],
+			shouldPass:    false,
+		},
+		{
+			formatConfigs: formatInputCases[3],
+			shouldPass:    false,
+		},
+		{
+			formatConfigs: formatInputCases[4],
+			shouldPass:    false,
+		},
+		{
+			formatConfigs: formatInputCases[5],
+			shouldPass:    false,
+		},
+		{
+			formatConfigs: formatInputCases[6],
+			shouldPass:    false,
+		},
+		{
+			formatConfigs: formatInputCases[7],
+			shouldPass:    false,
+		},
+	}
+
+	for i, testCase := range testCases {
+		err := checkFormatXL(testCase.formatConfigs)
+		if err != nil && testCase.shouldPass {
+			t.Errorf("Test %d: Expected to pass but failed with %s", i+1, err)
+		}
+		if err == nil && !testCase.shouldPass {
+			t.Errorf("Test %d: Expected to fail but passed instead", i+1)
+		}
+	}
+}
+
+// Tests uuid order verification function.
+func TestSavedUUIDOrder(t *testing.T) {
+	uuidTestCases := make([]struct {
+		uuid       string
+		shouldPass bool
+	}, 8)
+	jbod := make([]string, 8)
+	formatConfigs := make([]*formatConfigV1, 8)
+	for index := range jbod {
+		jbod[index] = getUUID()
+		uuidTestCases[index].uuid = jbod[index]
+		uuidTestCases[index].shouldPass = true
+	}
+	for index := range jbod {
+		formatConfigs[index] = &formatConfigV1{
+			Version: "1",
+			Format:  "xl",
+			XL: &xlFormat{
+				Version: "1",
+				Disk:    jbod[index],
+				JBOD:    jbod,
+			},
+		}
+	}
+	// Re order jbod for failure case.
+	var jbod1 = make([]string, 8)
+	for i, j := range jbod {
+		jbod1[i] = j
+	}
+	jbod1[1], jbod1[2] = jbod[2], jbod[1]
+	formatConfigs[2].XL.JBOD = jbod1
+	uuidTestCases[1].shouldPass = false
+	uuidTestCases[2].shouldPass = false
+
+	for i, testCase := range uuidTestCases {
+		// Is uuid present on all JBOD ?.
+		if testCase.shouldPass != isSavedUUIDInOrder(testCase.uuid, formatConfigs) {
+			t.Errorf("Test %d: Expected to pass but failed", i+1)
+		}
+	}
+}
+
+// Test initFormatXL() when disks are expected to return errors
+func TestInitFormatXLErrors(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl := obj.(xlObjects)
+
+	testStorageDisks := make([]StorageAPI, 16)
+
+	// All disks API return disk not found
+	for i := 0; i < 16; i++ {
+		d := xl.storageDisks[i].(*posix)
+		testStorageDisks[i] = &naughtyDisk{disk: d, defaultErr: errDiskNotFound}
+	}
+	if err := initFormatXL(testStorageDisks); err != errDiskNotFound {
+		t.Fatal("Got a different error: ", err)
+	}
+
+	// All disks returns disk not found in the fourth call
+	for i := 0; i < 15; i++ {
+		d := xl.storageDisks[i].(*posix)
+		testStorageDisks[i] = &naughtyDisk{disk: d, defaultErr: errDiskNotFound, errors: map[int]error{0: nil, 1: nil, 2: nil}}
+	}
+	if err := initFormatXL(testStorageDisks); err != errDiskNotFound {
+		t.Fatal("Got a different error: ", err)
+	}
+
+	// All disks are nil (disk not found)
+	for i := 0; i < 15; i++ {
+		testStorageDisks[i] = nil
+	}
+	if err := initFormatXL(testStorageDisks); err != errDiskNotFound {
+		t.Fatal("Got a different error: ", err)
+	}
+
+	removeRoots(fsDirs)
+}
+
+// Test for reduceFormatErrs()
+func TestReduceFormatErrs(t *testing.T) {
+	// No error founds
+	if err := reduceFormatErrs([]error{nil, nil, nil, nil}, 4); err != nil {
+		t.Fatal("Err should be nil, found: ", err)
+	}
+	// One corrupted format
+	if err := reduceFormatErrs([]error{nil, nil, errCorruptedFormat, nil}, 4); err != errCorruptedFormat {
+		t.Fatal("Got a differnt error: ", err)
+	}
+	// All disks unformatted
+	if err := reduceFormatErrs([]error{errUnformattedDisk, errUnformattedDisk, errUnformattedDisk, errUnformattedDisk}, 4); err != errUnformattedDisk {
+		t.Fatal("Got a differnt error: ", err)
+	}
+	// Some disks unformatted
+	if err := reduceFormatErrs([]error{nil, nil, errUnformattedDisk, errUnformattedDisk}, 4); err != errSomeDiskUnformatted {
+		t.Fatal("Got a differnt error: ", err)
+	}
+	// Some disks offline
+	if err := reduceFormatErrs([]error{nil, nil, errDiskNotFound, errUnformattedDisk}, 4); err != errSomeDiskOffline {
+		t.Fatal("Got a differnt error: ", err)
+	}
+}
+
+// Tests for genericFormatCheck()
+func TestGenericFormatCheck(t *testing.T) {
+	var errs []error
+	formatConfigs := genFormatXLInvalidJBOD()
+
+	// Some disks has corrupted formats, one faulty disk
+	errs = []error{nil, nil, errCorruptedFormat, errCorruptedFormat, errCorruptedFormat, errCorruptedFormat,
+		errCorruptedFormat, errFaultyDisk}
+	if err := genericFormatCheck(formatConfigs, errs); err != errCorruptedFormat {
+		t.Fatal("Got unexpected err: ", err)
+	}
+
+	// Many faulty disks
+	errs = []error{nil, nil, errFaultyDisk, errFaultyDisk, errFaultyDisk, errFaultyDisk,
+		errCorruptedFormat, errFaultyDisk}
+	if err := genericFormatCheck(formatConfigs, errs); err != errXLReadQuorum {
+		t.Fatal("Got unexpected err: ", err)
+	}
+
+	// All formats successfully loaded
+	errs = []error{nil, nil, nil, nil, nil, nil, nil, nil}
+	if err := genericFormatCheck(formatConfigs, errs); err == nil {
+		t.Fatalf("Should fail here")
+	}
+
+}
+
+func TestLoadFormatXLErrs(t *testing.T) {
+	// Create an instance of xl backend.
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl := obj.(xlObjects)
+
+	xl.storageDisks[11] = nil
+
+	// disk 12 returns faulty disk
+	posixDisk, ok := xl.storageDisks[12].(*posix)
+	if !ok {
+		t.Fatal("storage disk is not *posix type")
+	}
+	xl.storageDisks[10] = newNaughtyDisk(posixDisk, nil, errFaultyDisk)
+	if _, err = loadFormatXL(xl.storageDisks); err != errFaultyDisk {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+
+	removeRoots(fsDirs)
+
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+
+	// disks 0..10 returns disk not found
+	for i := 0; i <= 10; i++ {
+		posixDisk, ok := xl.storageDisks[i].(*posix)
+		if !ok {
+			t.Fatal("storage disk is not *posix type")
+		}
+		xl.storageDisks[i] = newNaughtyDisk(posixDisk, nil, errDiskNotFound)
+	}
+	if _, err = loadFormatXL(xl.storageDisks); err != errXLReadQuorum {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+
+	removeRoots(fsDirs)
+
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+
+	// disks 0..10 returns unformatted disk
+	for i := 0; i <= 10; i++ {
+		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if _, err = loadFormatXL(xl.storageDisks); err != errUnformattedDisk {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+
+	removeRoots(fsDirs)
+
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+
+	// disks 0..15 returns is nil (disk not found)
+	for i := 0; i < 16; i++ {
+		xl.storageDisks[i] = nil
+	}
+	if _, err := loadFormatXL(xl.storageDisks); err != errDiskNotFound {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+
+	removeRoots(fsDirs)
+}
+
+// Tests for healFormatXLCorruptedDisks() with cases which lead to errors
+func TestHealFormatXLCorruptedDisksErrs(t *testing.T) {
+	// Everything is fine, should return nil
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl := obj.(xlObjects)
+	if err = healFormatXLCorruptedDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// Disks 0..15 are nil
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	for i := 0; i <= 15; i++ {
+		xl.storageDisks[i] = nil
+	}
+	if err = healFormatXLCorruptedDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// One disk returns Faulty Disk
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	posixDisk, ok := xl.storageDisks[0].(*posix)
+	if !ok {
+		t.Fatal("storage disk is not *posix type")
+	}
+	xl.storageDisks[0] = newNaughtyDisk(posixDisk, nil, errFaultyDisk)
+	if err = healFormatXLCorruptedDisks(xl.storageDisks); err != errFaultyDisk {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// One disk is not found, heal corrupted disks should return nil
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	xl.storageDisks[0] = nil
+	if err = healFormatXLCorruptedDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// Remove format.json of all disks
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	for i := 0; i <= 15; i++ {
+		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err = healFormatXLCorruptedDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// Corrupted format json in one disk
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	for i := 0; i <= 15; i++ {
+		if err = xl.storageDisks[i].AppendFile(".minio.sys", "format.json", []byte("corrupted data")); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err = healFormatXLCorruptedDisks(xl.storageDisks); err == nil {
+		t.Fatal("Should get a json parsing error, ")
+	}
+	removeRoots(fsDirs)
+}
+
+// Tests for healFormatXLFreshDisks() with cases which lead to errors
+func TestHealFormatXLFreshDisksErrs(t *testing.T) {
+	// Everything is fine, should return nil
+	obj, fsDirs, err := getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl := obj.(xlObjects)
+	if err = healFormatXLFreshDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// Disks 0..15 are nil
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	for i := 0; i <= 15; i++ {
+		xl.storageDisks[i] = nil
+	}
+	if err = healFormatXLFreshDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// One disk returns Faulty Disk
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	posixDisk, ok := xl.storageDisks[0].(*posix)
+	if !ok {
+		t.Fatal("storage disk is not *posix type")
+	}
+	xl.storageDisks[0] = newNaughtyDisk(posixDisk, nil, errFaultyDisk)
+	if err = healFormatXLFreshDisks(xl.storageDisks); err != errFaultyDisk {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// One disk is not found, heal corrupted disks should return nil
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	xl.storageDisks[0] = nil
+	if err = healFormatXLFreshDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// Remove format.json of all disks
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	for i := 0; i <= 15; i++ {
+		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err = healFormatXLFreshDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+	// Remove format.json of all disks
+	obj, fsDirs, err = getXLObjectLayer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	xl = obj.(xlObjects)
+	for i := 0; i <= 15; i++ {
+		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err = healFormatXLFreshDisks(xl.storageDisks); err != nil {
+		t.Fatal("Got an unexpected error: ", err)
+	}
+	removeRoots(fsDirs)
+
+}
+
+// Tests for isFormatFound()
+func TestIsFormatFound(t *testing.T) {
+	formats := genFormatXLValid()
+	if found := isFormatFound(formats); !found {
+		t.Fatal("isFormatFound() should not return false")
+	}
+	formats[0] = nil
+	if found := isFormatFound(formats); found {
+		t.Fatal("isFormatFound() should not return true")
+	}
+}
+
+// Tests for isFormatNotFound()
+func TestIsFormatNotFound(t *testing.T) {
+	formats := genFormatXLValid()
+	if found := isFormatNotFound(formats); found {
+		t.Fatal("isFormatFound() should not return true")
+	}
+	formats[0] = nil
+	if found := isFormatNotFound(formats); found {
+		t.Fatal("isFormatFound() should not return true")
+	}
+	for idx := range formats {
+		formats[idx] = nil
+	}
+	if found := isFormatNotFound(formats); !found {
+		t.Fatal("isFormatFound() should not return false")
+	}
+}

cmd/fs-createfile.go

@@ -0,0 +1,41 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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"
+
+func fsCreateFile(disk StorageAPI, reader io.Reader, buf []byte, tmpBucket, tempObj string) (int64, error) {
+	bytesWritten := int64(0)
+	// Read the buffer till io.EOF and append the read data to the temporary file.
+	for {
+		n, rErr := reader.Read(buf)
+		if rErr != nil && rErr != io.EOF {
+			return 0, rErr
+		}
+		bytesWritten += int64(n)
+		if n > 0 {
+			wErr := disk.AppendFile(tmpBucket, tempObj, buf[0:n])
+			if wErr != nil {
+				return 0, wErr
+			}
+		}
+		if rErr == io.EOF {
+			break
+		}
+	}
+	return bytesWritten, nil
+}

cmd/fs-v1-errors.go

@@ -0,0 +1,22 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "errors"
+
+// errFSDiskFormat - returned when given disk format is other than FS format.
+var errFSDiskFormat = errors.New("Disk is not in FS format.")

cmd/fs-v1-metadata.go

@@ -0,0 +1,188 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"encoding/json"
+	"os"
+	"path"
+	"sort"
+	"strings"
+)
+
+const (
+	fsMetaJSONFile   = "fs.json"
+	fsFormatJSONFile = "format.json"
+)
+
+// A fsMetaV1 represents a metadata header mapping keys to sets of values.
+type fsMetaV1 struct {
+	Version string `json:"version"`
+	Format  string `json:"format"`
+	Minio   struct {
+		Release string `json:"release"`
+	} `json:"minio"`
+	// Metadata map for current object `fs.json`.
+	Meta  map[string]string `json:"meta,omitempty"`
+	Parts []objectPartInfo  `json:"parts,omitempty"`
+}
+
+// ObjectPartIndex - returns the index of matching object part number.
+func (m fsMetaV1) ObjectPartIndex(partNumber int) (partIndex int) {
+	for i, part := range m.Parts {
+		if partNumber == part.Number {
+			partIndex = i
+			return partIndex
+		}
+	}
+	return -1
+}
+
+// AddObjectPart - add a new object part in order.
+func (m *fsMetaV1) AddObjectPart(partNumber int, partName string, partETag string, partSize int64) {
+	partInfo := objectPartInfo{
+		Number: partNumber,
+		Name:   partName,
+		ETag:   partETag,
+		Size:   partSize,
+	}
+
+	// Update part info if it already exists.
+	for i, part := range m.Parts {
+		if partNumber == part.Number {
+			m.Parts[i] = partInfo
+			return
+		}
+	}
+
+	// Proceed to include new part info.
+	m.Parts = append(m.Parts, partInfo)
+
+	// Parts in fsMeta should be in sorted order by part number.
+	sort.Sort(byObjectPartNumber(m.Parts))
+}
+
+// readFSMetadata - returns the object metadata `fs.json` content.
+func readFSMetadata(disk StorageAPI, bucket, filePath string) (fsMeta fsMetaV1, err error) {
+	// Read all `fs.json`.
+	buf, err := disk.ReadAll(bucket, filePath)
+	if err != nil {
+		return fsMetaV1{}, err
+	}
+
+	// Decode `fs.json` into fsMeta structure.
+	if err = json.Unmarshal(buf, &fsMeta); err != nil {
+		return fsMetaV1{}, err
+	}
+
+	// Success.
+	return fsMeta, nil
+}
+
+// Write fsMeta to fs.json or fs-append.json.
+func writeFSMetadata(disk StorageAPI, bucket, filePath string, fsMeta fsMetaV1) (err error) {
+	tmpPath := path.Join(tmpMetaPrefix, getUUID())
+	metadataBytes, err := json.Marshal(fsMeta)
+	if err != nil {
+		return err
+	}
+	if err = disk.AppendFile(minioMetaBucket, tmpPath, metadataBytes); err != nil {
+		return err
+	}
+	return disk.RenameFile(minioMetaBucket, tmpPath, bucket, filePath)
+}
+
+// newFSMetaV1 - initializes new fsMetaV1.
+func newFSMetaV1() (fsMeta fsMetaV1) {
+	fsMeta = fsMetaV1{}
+	fsMeta.Version = "1.0.0"
+	fsMeta.Format = "fs"
+	fsMeta.Minio.Release = ReleaseTag
+	return fsMeta
+}
+
+// newFSFormatV1 - initializes new formatConfigV1 with FS format info.
+func newFSFormatV1() (format formatConfigV1) {
+	return formatConfigV1{
+		Version: "1",
+		Format:  "fs",
+		FS: &fsFormat{
+			Version: "1",
+		},
+	}
+}
+
+// isFSFormat - returns whether given formatConfigV1 is FS type or not.
+func isFSFormat(format formatConfigV1) bool {
+	return format.Format == "fs"
+}
+
+// writes FS format (format.json) into minioMetaBucket.
+func writeFSFormatData(storage StorageAPI, fsFormat formatConfigV1) error {
+	metadataBytes, err := json.Marshal(fsFormat)
+	if err != nil {
+		return err
+	}
+	// fsFormatJSONFile - format.json file stored in minioMetaBucket(.minio) directory.
+	if err = storage.AppendFile(minioMetaBucket, fsFormatJSONFile, metadataBytes); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Return if the part info in uploadedParts and completeParts are same.
+func isPartsSame(uploadedParts []objectPartInfo, completeParts []completePart) bool {
+	if len(uploadedParts) != len(completeParts) {
+		return false
+	}
+	for i := range completeParts {
+		if uploadedParts[i].Number != completeParts[i].PartNumber ||
+			uploadedParts[i].ETag != completeParts[i].ETag {
+			return false
+		}
+	}
+	return true
+}
+
+var extendedHeaders = []string{
+	"X-Amz-Meta-",
+	"X-Minio-Meta-",
+	// Add new extended headers.
+}
+
+// isExtendedHeader validates if input string matches extended headers.
+func isExtendedHeader(header string) bool {
+	for _, extendedHeader := range extendedHeaders {
+		if strings.HasPrefix(header, extendedHeader) {
+			return true
+		}
+	}
+	return false
+}
+
+// Return true if extended HTTP headers are set, false otherwise.
+func hasExtendedHeader(metadata map[string]string) bool {
+	if os.Getenv("MINIO_ENABLE_FSMETA") == "1" {
+		return true
+	}
+	for k := range metadata {
+		if isExtendedHeader(k) {
+			return true
+		}
+	}
+	return false
+}

cmd/fs-v1-metadata_test.go

@@ -0,0 +1,66 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"os"
+	"testing"
+)
+
+// Tests scenarios which can occur for hasExtendedHeader function.
+func TestHasExtendedHeader(t *testing.T) {
+	// All test cases concerning hasExtendedHeader function.
+	testCases := []struct {
+		metadata map[string]string
+		has      bool
+	}{
+		// Verifies if X-Amz-Meta is present.
+		{
+			metadata: map[string]string{
+				"X-Amz-Meta-1": "value",
+			},
+			has: true || os.Getenv("MINIO_ENABLE_FSMETA") == "1",
+		},
+		// Verifies if X-Minio-Meta is present.
+		{
+			metadata: map[string]string{
+				"X-Minio-Meta-1": "value",
+			},
+			has: true || os.Getenv("MINIO_ENABLE_FSMETA") == "1",
+		},
+		// Verifies if extended header is not present.
+		{
+			metadata: map[string]string{
+				"md5Sum": "value",
+			},
+			has: false || os.Getenv("MINIO_ENABLE_FSMETA") == "1",
+		},
+		// Verifies if extended header is not present, but with an empty input.
+		{
+			metadata: nil,
+			has:      false || os.Getenv("MINIO_ENABLE_FSMETA") == "1",
+		},
+	}
+
+	// Validate all test cases.
+	for i, testCase := range testCases {
+		has := hasExtendedHeader(testCase.metadata)
+		if has != testCase.has {
+			t.Fatalf("Test case %d: Expected \"%#v\", but got \"%#v\"", i+1, testCase.has, has)
+		}
+	}
+}

cmd/fs-v1-multipart-common.go

@@ -0,0 +1,112 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"encoding/json"
+	"path"
+	"time"
+)
+
+// Returns if the prefix is a multipart upload.
+func (fs fsObjects) isMultipartUpload(bucket, prefix string) bool {
+	_, err := fs.storage.StatFile(bucket, pathJoin(prefix, uploadsJSONFile))
+	return err == nil
+}
+
+// Checks whether bucket exists.
+func (fs fsObjects) isBucketExist(bucket string) bool {
+	// Check whether bucket exists.
+	_, err := fs.storage.StatVol(bucket)
+	if err != nil {
+		if err == errVolumeNotFound {
+			return false
+		}
+		errorIf(err, "Stat failed on bucket "+bucket+".")
+		return false
+	}
+	return true
+}
+
+// isUploadIDExists - verify if a given uploadID exists and is valid.
+func (fs fsObjects) isUploadIDExists(bucket, object, uploadID string) bool {
+	uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
+	_, err := fs.storage.StatFile(minioMetaBucket, path.Join(uploadIDPath, fsMetaJSONFile))
+	if err != nil {
+		if err == errFileNotFound {
+			return false
+		}
+		errorIf(err, "Unable to access upload id"+uploadIDPath)
+		return false
+	}
+	return true
+}
+
+// writeUploadJSON - create `uploads.json` or update it with new uploadID.
+func (fs fsObjects) writeUploadJSON(bucket, object, uploadID string, initiated time.Time) (err error) {
+	uploadsPath := path.Join(mpartMetaPrefix, bucket, object, uploadsJSONFile)
+	uniqueID := getUUID()
+	tmpUploadsPath := path.Join(tmpMetaPrefix, uniqueID)
+	var uploadsJSON uploadsV1
+	uploadsJSON, err = readUploadsJSON(bucket, object, fs.storage)
+	if err != nil {
+		// For any other errors.
+		if err != errFileNotFound {
+			return err
+		}
+		// Set uploads format to `fs`.
+		uploadsJSON = newUploadsV1("fs")
+	}
+	// Add a new upload id.
+	uploadsJSON.AddUploadID(uploadID, initiated)
+
+	// Update `uploads.json` on all disks.
+	uploadsJSONBytes, wErr := json.Marshal(&uploadsJSON)
+	if wErr != nil {
+		return wErr
+	}
+	// Write `uploads.json` to disk.
+	if wErr = fs.storage.AppendFile(minioMetaBucket, tmpUploadsPath, uploadsJSONBytes); wErr != nil {
+		return wErr
+	}
+	wErr = fs.storage.RenameFile(minioMetaBucket, tmpUploadsPath, minioMetaBucket, uploadsPath)
+	if wErr != nil {
+		if dErr := fs.storage.DeleteFile(minioMetaBucket, tmpUploadsPath); dErr != nil {
+			return dErr
+		}
+		return wErr
+	}
+	return nil
+}
+
+// updateUploadsJSON - update `uploads.json` with new uploadsJSON for all disks.
+func (fs fsObjects) updateUploadsJSON(bucket, object string, uploadsJSON uploadsV1) (err error) {
+	uploadsPath := path.Join(mpartMetaPrefix, bucket, object, uploadsJSONFile)
+	uniqueID := getUUID()
+	tmpUploadsPath := path.Join(tmpMetaPrefix, uniqueID)
+	uploadsBytes, wErr := json.Marshal(uploadsJSON)
+	if wErr != nil {
+		return wErr
+	}
+	if wErr = fs.storage.AppendFile(minioMetaBucket, tmpUploadsPath, uploadsBytes); wErr != nil {
+		return wErr
+	}
+	if wErr = fs.storage.RenameFile(minioMetaBucket, tmpUploadsPath, minioMetaBucket, uploadsPath); wErr != nil {
+		return wErr
+	}
+	return nil
+}

cmd/fs-v1-multipart.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"crypto/md5"
@@ -24,6 +24,7 @@ import (
 	"path"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/skyrings/skyring-common/tools/uuid"
@@ -66,15 +67,19 @@ func (fs fsObjects) listMultipartUploads(bucket, prefix, keyMarker, uploadIDMark
 		}
 		maxUploads = maxUploads - len(uploads)
 	}
+	var walkResultCh chan treeWalkResult
+	var endWalkCh chan struct{}
+	heal := false // true only for xl.ListObjectsHeal()
 	if maxUploads > 0 {
-		walker := fs.lookupTreeWalk(listParams{minioMetaBucket, recursive, multipartMarkerPath, multipartPrefixPath})
-		if walker == nil {
-			walker = fs.startTreeWalk(minioMetaBucket, multipartPrefixPath, multipartMarkerPath, recursive, func(bucket, object string) bool {
-				return fs.isMultipartUpload(bucket, object)
-			})
+		walkResultCh, endWalkCh = fs.listPool.Release(listParams{minioMetaBucket, recursive, multipartMarkerPath, multipartPrefixPath, heal})
+		if walkResultCh == nil {
+			endWalkCh = make(chan struct{})
+			isLeaf := fs.isMultipartUpload
+			listDir := listDirFactory(isLeaf, fs.storage)
+			walkResultCh = startTreeWalk(minioMetaBucket, multipartPrefixPath, multipartMarkerPath, recursive, listDir, isLeaf, endWalkCh)
 		}
 		for maxUploads > 0 {
-			walkResult, ok := <-walker.ch
+			walkResult, ok := <-walkResultCh
 			if !ok {
 				// Closed channel.
 				eof = true
@@ -83,7 +88,7 @@ func (fs fsObjects) listMultipartUploads(bucket, prefix, keyMarker, uploadIDMark
 			// For any walk error return right away.
 			if walkResult.err != nil {
 				// File not found or Disk not found is a valid case.
-				if walkResult.err == errFileNotFound || walkResult.err == errDiskNotFound {
+				if isErrIgnored(walkResult.err, walkResultIgnoredErrs) {
 					eof = true
 					break
 				}
@@ -137,6 +142,13 @@ func (fs fsObjects) listMultipartUploads(bucket, prefix, keyMarker, uploadIDMark
 		result.NextKeyMarker = objectName
 		result.NextUploadIDMarker = uploadID
 	}
+
+	if !eof {
+		// Save the go-routine state in the pool so that it can continue from where it left off on
+		// the next request.
+		fs.listPool.Set(listParams{bucket, recursive, result.NextKeyMarker, prefix, heal}, walkResultCh, endWalkCh)
+	}
+
 	result.IsTruncated = !eof
 	if !result.IsTruncated {
 		result.NextKeyMarker = ""
@@ -206,14 +218,14 @@ func (fs fsObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMark
 // all the disks. `uploads.json` carries metadata regarding on going
 // multipart operation on the object.
 func (fs fsObjects) newMultipartUpload(bucket string, object string, meta map[string]string) (uploadID string, err error) {
-	// No metadata is set, allocate a new one.
-	if meta == nil {
-		meta = make(map[string]string)
-	}
-
 	// Initialize `fs.json` values.
 	fsMeta := newFSMetaV1()
 
+	// Save additional metadata only if extended headers such as "X-Amz-Meta-" are set.
+	if hasExtendedHeader(meta) {
+		fsMeta.Meta = meta
+	}
+
 	// This lock needs to be held for any changes to the directory contents of ".minio/multipart/object/"
 	nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object))
 	defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object))
@@ -221,20 +233,12 @@ func (fs fsObjects) newMultipartUpload(bucket string, object string, meta map[st
 	uploadID = getUUID()
 	initiated := time.Now().UTC()
 	// Create 'uploads.json'
-	if err = writeUploadJSON(bucket, object, uploadID, initiated, fs.storage); err != nil {
+	if err = fs.writeUploadJSON(bucket, object, uploadID, initiated); err != nil {
 		return "", err
 	}
-	uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
-	tempUploadIDPath := path.Join(tmpMetaPrefix, uploadID)
-	if err = fs.writeFSMetadata(minioMetaBucket, tempUploadIDPath, fsMeta); err != nil {
-		return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
-	}
-	err = fs.storage.RenameFile(minioMetaBucket, path.Join(tempUploadIDPath, fsMetaJSONFile), minioMetaBucket, path.Join(uploadIDPath, fsMetaJSONFile))
-	if err != nil {
-		if dErr := fs.storage.DeleteFile(minioMetaBucket, path.Join(tempUploadIDPath, fsMetaJSONFile)); dErr != nil {
-			return "", toObjectErr(dErr, minioMetaBucket, tempUploadIDPath)
-		}
-		return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
+	fsMetaPath := path.Join(mpartMetaPrefix, bucket, object, uploadID, fsMetaJSONFile)
+	if err = writeFSMetadata(fs.storage, minioMetaBucket, fsMetaPath, fsMeta); err != nil {
+		return "", toObjectErr(err, minioMetaBucket, fsMetaPath)
 	}
 	// Return success.
 	return uploadID, nil
@@ -246,7 +250,6 @@ func (fs fsObjects) newMultipartUpload(bucket string, object string, meta map[st
 //
 // Implements S3 compatible initiate multipart API.
 func (fs fsObjects) NewMultipartUpload(bucket, object string, meta map[string]string) (string, error) {
-	meta = make(map[string]string) // Reset the meta value, we are not going to save headers for fs.
 	// Verify if bucket name is valid.
 	if !IsValidBucketName(bucket) {
 		return "", BucketNameInvalid{Bucket: bucket}
@@ -262,6 +265,150 @@ func (fs fsObjects) NewMultipartUpload(bucket, object string, meta map[string]st
 	return fs.newMultipartUpload(bucket, object, meta)
 }
 
+// Returns if a new part can be appended to fsAppendDataFile.
+func partToAppend(fsMeta fsMetaV1, fsAppendMeta fsMetaV1) (part objectPartInfo, appendNeeded bool) {
+	if len(fsMeta.Parts) == 0 {
+		return
+	}
+	// As fsAppendMeta.Parts will be sorted len(fsAppendMeta.Parts) will naturally be the next part number
+	nextPartNum := len(fsAppendMeta.Parts) + 1
+	nextPartIndex := fsMeta.ObjectPartIndex(nextPartNum)
+	if nextPartIndex == -1 {
+		return
+	}
+	return fsMeta.Parts[nextPartIndex], true
+}
+
+// Returns metadata path for the file holding info about the parts that
+// have been appended to the "append-file"
+func getFSAppendMetaPath(uploadID string) string {
+	return path.Join(tmpMetaPrefix, uploadID+".json")
+}
+
+// Returns path for the append-file.
+func getFSAppendDataPath(uploadID string) string {
+	return path.Join(tmpMetaPrefix, uploadID+".data")
+}
+
+// Parts pool shared buffer.
+var appendPartsBufPool = sync.Pool{
+	New: func() interface{} {
+		b := make([]byte, readSizeV1)
+		return &b
+	},
+}
+
+// Append parts to fsAppendDataFile.
+func appendParts(disk StorageAPI, bucket, object, uploadID string) {
+	uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
+	// fs-append.json path
+	fsAppendMetaPath := getFSAppendMetaPath(uploadID)
+	// fs.json path
+	fsMetaPath := path.Join(mpartMetaPrefix, bucket, object, uploadID, fsMetaJSONFile)
+
+	// Lock the uploadID so that no one modifies fs.json
+	nsMutex.RLock(minioMetaBucket, uploadIDPath)
+	fsMeta, err := readFSMetadata(disk, minioMetaBucket, fsMetaPath)
+	nsMutex.RUnlock(minioMetaBucket, uploadIDPath)
+	if err != nil {
+		return
+	}
+
+	// Lock fs-append.json so that there is no parallel append to the file.
+	nsMutex.Lock(minioMetaBucket, fsAppendMetaPath)
+	defer nsMutex.Unlock(minioMetaBucket, fsAppendMetaPath)
+
+	fsAppendMeta, err := readFSMetadata(disk, minioMetaBucket, fsAppendMetaPath)
+	if err != nil {
+		if err != errFileNotFound {
+			return
+		}
+		fsAppendMeta = fsMeta
+		fsAppendMeta.Parts = nil
+	}
+
+	// Check if a part needs to be appended to
+	part, appendNeeded := partToAppend(fsMeta, fsAppendMeta)
+	if !appendNeeded {
+		return
+	}
+	// Hold write lock on the part so that there is no parallel upload on the part.
+	nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(part.Number)))
+	defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(part.Number)))
+
+	// Proceed to append "part"
+	fsAppendDataPath := getFSAppendDataPath(uploadID)
+	tmpDataPath := path.Join(tmpMetaPrefix, getUUID())
+	if part.Number != 1 {
+		// Move it to tmp location before appending so that we don't leave inconsitent data
+		// if server crashes during append operation.
+		err = disk.RenameFile(minioMetaBucket, fsAppendDataPath, minioMetaBucket, tmpDataPath)
+		if err != nil {
+			return
+		}
+		// Delete fs-append.json so that we don't leave a stale file if server crashes
+		// when the part is being appended to the tmp file.
+		err = disk.DeleteFile(minioMetaBucket, fsAppendMetaPath)
+		if err != nil {
+			return
+		}
+	}
+	// Path to the part that needs to be appended.
+	partPath := path.Join(mpartMetaPrefix, bucket, object, uploadID, part.Name)
+	offset := int64(0)
+	totalLeft := part.Size
+
+	// Get buffer from parts pool.
+	bufp := appendPartsBufPool.Get().(*[]byte)
+	buf := *bufp
+	for totalLeft > 0 {
+		curLeft := int64(readSizeV1)
+		if totalLeft < readSizeV1 {
+			curLeft = totalLeft
+		}
+		var n int64
+		n, err = disk.ReadFile(minioMetaBucket, partPath, offset, buf[:curLeft])
+		if n > 0 {
+			if err = disk.AppendFile(minioMetaBucket, tmpDataPath, buf[:n]); err != nil {
+				return
+			}
+		}
+		if err != nil {
+			if err == io.EOF || err == io.ErrUnexpectedEOF {
+				break
+			}
+			return
+		}
+		offset += n
+		totalLeft -= n
+	}
+	appendPartsBufPool.Put(bufp)
+
+	// All good, the part has been appended to the tmp file, rename it back.
+	if err = disk.RenameFile(minioMetaBucket, tmpDataPath, minioMetaBucket, fsAppendDataPath); err != nil {
+		errorIf(err, "Unable to rename %s to %s", tmpDataPath, fsAppendDataPath)
+		return
+	}
+	fsAppendMeta.AddObjectPart(part.Number, part.Name, part.ETag, part.Size)
+	if err = writeFSMetadata(disk, minioMetaBucket, fsAppendMetaPath, fsAppendMeta); err != nil {
+		errorIf(err, "Unable to write FS metadata %s", fsAppendMetaPath)
+		return
+	}
+	// If there are more parts that need to be appended to fsAppendDataFile
+	_, appendNeeded = partToAppend(fsMeta, fsAppendMeta)
+	if appendNeeded {
+		go appendParts(disk, bucket, object, uploadID)
+	}
+}
+
+// Parts pool shared buffer.
+var partsBufPool = sync.Pool{
+	New: func() interface{} {
+		b := make([]byte, readSizeV1)
+		return &b
+	},
+}
+
 // PutObjectPart - reads incoming data until EOF for the part file on
 // an ongoing multipart transaction. Internally incoming data is
 // written to '.minio/tmp' location and safely renamed to
@@ -289,39 +436,59 @@ func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, s
 		return "", InvalidUploadID{UploadID: uploadID}
 	}
 
-	// Hold write lock on the part so that there is no parallel upload on the part.
-	nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
-	defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
-
 	partSuffix := fmt.Sprintf("object%d", partID)
-	tmpPartPath := path.Join(tmpMetaPrefix, uploadID, partSuffix)
+	tmpPartPath := path.Join(tmpMetaPrefix, uploadID+"."+getUUID()+"."+partSuffix)
 
 	// Initialize md5 writer.
 	md5Writer := md5.New()
 
-	var buf = make([]byte, blockSizeV1)
-	for {
-		n, err := io.ReadFull(data, buf)
-		if err == io.EOF {
-			break
-		}
-		if err != nil && err != io.ErrUnexpectedEOF {
+	// Limit the reader to its provided size if specified.
+	var limitDataReader io.Reader
+	if size > 0 {
+		// This is done so that we can avoid erroneous clients sending more data than the set content size.
+		limitDataReader = io.LimitReader(data, size)
+	} else {
+		// else we read till EOF.
+		limitDataReader = data
+	}
+
+	teeReader := io.TeeReader(limitDataReader, md5Writer)
+	bufSize := int64(readSizeV1)
+	if size > 0 && bufSize > size {
+		bufSize = size
+	}
+	bufp := partsBufPool.Get().(*[]byte)
+	buf := *bufp
+	defer partsBufPool.Put(bufp)
+
+	bytesWritten, cErr := fsCreateFile(fs.storage, teeReader, buf[:bufSize], minioMetaBucket, tmpPartPath)
+	if cErr != nil {
+		fs.storage.DeleteFile(minioMetaBucket, tmpPartPath)
+		return "", toObjectErr(cErr, minioMetaBucket, tmpPartPath)
+	}
+	// Should return IncompleteBody{} error when reader has fewer
+	// bytes than specified in request header.
+	if bytesWritten < size {
+		fs.storage.DeleteFile(minioMetaBucket, tmpPartPath)
+		return "", IncompleteBody{}
+	}
+
+	// Validate if payload is valid.
+	if isSignVerify(data) {
+		if err := data.(*signVerifyReader).Verify(); err != nil {
+			// Incoming payload wrong, delete the temporary object.
+			fs.storage.DeleteFile(minioMetaBucket, tmpPartPath)
+			// Error return.
 			return "", toObjectErr(err, bucket, object)
 		}
-		// Update md5 writer.
-		md5Writer.Write(buf[:n])
-		m, err := fs.storage.AppendFile(minioMetaBucket, tmpPartPath, buf[:n])
-		if err != nil {
-			return "", toObjectErr(err, bucket, object)
-		}
-		if m != int64(len(buf[:n])) {
-			return "", toObjectErr(errUnexpected, bucket, object)
-		}
 	}
 
 	newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
 	if md5Hex != "" {
 		if newMD5Hex != md5Hex {
+			// MD5 mismatch, delete the temporary object.
+			fs.storage.DeleteFile(minioMetaBucket, tmpPartPath)
+			// Returns md5 mismatch.
 			return "", BadDigest{md5Hex, newMD5Hex}
 		}
 	}
@@ -335,9 +502,10 @@ func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, s
 		return "", InvalidUploadID{UploadID: uploadID}
 	}
 
-	fsMeta, err := fs.readFSMetadata(minioMetaBucket, uploadIDPath)
+	fsMetaPath := pathJoin(uploadIDPath, fsMetaJSONFile)
+	fsMeta, err := readFSMetadata(fs.storage, minioMetaBucket, fsMetaPath)
 	if err != nil {
-		return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
+		return "", toObjectErr(err, minioMetaBucket, fsMetaPath)
 	}
 	fsMeta.AddObjectPart(partID, partSuffix, newMD5Hex, size)
 
@@ -349,18 +517,11 @@ func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, s
 		}
 		return "", toObjectErr(err, minioMetaBucket, partPath)
 	}
-	uploadIDPath = path.Join(mpartMetaPrefix, bucket, object, uploadID)
-	tempUploadIDPath := path.Join(tmpMetaPrefix, uploadID)
-	if err = fs.writeFSMetadata(minioMetaBucket, tempUploadIDPath, fsMeta); err != nil {
-		return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
-	}
-	err = fs.storage.RenameFile(minioMetaBucket, path.Join(tempUploadIDPath, fsMetaJSONFile), minioMetaBucket, path.Join(uploadIDPath, fsMetaJSONFile))
-	if err != nil {
-		if dErr := fs.storage.DeleteFile(minioMetaBucket, path.Join(tempUploadIDPath, fsMetaJSONFile)); dErr != nil {
-			return "", toObjectErr(dErr, minioMetaBucket, tempUploadIDPath)
-		}
-		return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
+
+	if err = writeFSMetadata(fs.storage, minioMetaBucket, fsMetaPath, fsMeta); err != nil {
+		return "", toObjectErr(err, minioMetaBucket, fsMetaPath)
 	}
+	go appendParts(fs.storage, bucket, object, uploadID)
 	return newMD5Hex, nil
 }
 
@@ -370,10 +531,10 @@ func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, s
 func (fs fsObjects) listObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
 	result := ListPartsInfo{}
 
-	uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
-	fsMeta, err := fs.readFSMetadata(minioMetaBucket, uploadIDPath)
+	fsMetaPath := path.Join(mpartMetaPrefix, bucket, object, uploadID, fsMetaJSONFile)
+	fsMeta, err := readFSMetadata(fs.storage, minioMetaBucket, fsMetaPath)
 	if err != nil {
-		return ListPartsInfo{}, toObjectErr(err, minioMetaBucket, uploadIDPath)
+		return ListPartsInfo{}, toObjectErr(err, minioMetaBucket, fsMetaPath)
 	}
 	// Only parts with higher part numbers will be listed.
 	partIdx := fsMeta.ObjectPartIndex(partNumberMarker)
@@ -444,6 +605,14 @@ func (fs fsObjects) ListObjectParts(bucket, object, uploadID string, partNumberM
 	return fs.listObjectParts(bucket, object, uploadID, partNumberMarker, maxParts)
 }
 
+// Complete multipart pool shared buffer.
+var completeBufPool = sync.Pool{
+	New: func() interface{} {
+		b := make([]byte, readSizeV1)
+		return &b
+	},
+}
+
 // CompleteMultipartUpload - completes an ongoing multipart
 // transaction after receiving all the parts indicated by the client.
 // Returns an md5sum calculated by concatenating all the individual
@@ -471,18 +640,18 @@ func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, upload
 	// 1) no one aborts this multipart upload
 	// 2) no one does a parallel complete-multipart-upload on this
 	// multipart upload
-	nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
-	defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
+	nsMutex.Lock(minioMetaBucket, uploadIDPath)
+	defer nsMutex.Unlock(minioMetaBucket, uploadIDPath)
 
 	if !fs.isUploadIDExists(bucket, object, uploadID) {
 		return "", InvalidUploadID{UploadID: uploadID}
 	}
 
-	// Read saved fs metadata for ongoing multipart.
-	fsMeta, err := fs.readFSMetadata(minioMetaBucket, uploadIDPath)
-	if err != nil {
-		return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
-	}
+	// fs-append.json path
+	fsAppendMetaPath := getFSAppendMetaPath(uploadID)
+	// Lock fs-append.json so that no parallel appendParts() is being done.
+	nsMutex.Lock(minioMetaBucket, fsAppendMetaPath)
+	defer nsMutex.Unlock(minioMetaBucket, fsAppendMetaPath)
 
 	// Calculate s3 compatible md5sum for complete multipart.
 	s3MD5, err := completeMultipartMD5(parts...)
@@ -490,57 +659,105 @@ func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, upload
 		return "", err
 	}
 
-	tempObj := path.Join(tmpMetaPrefix, uploadID, "object1")
-	var buffer = make([]byte, blockSizeV1)
+	// Read saved fs metadata for ongoing multipart.
+	fsMetaPath := pathJoin(uploadIDPath, fsMetaJSONFile)
+	fsMeta, err := readFSMetadata(fs.storage, minioMetaBucket, fsMetaPath)
+	if err != nil {
+		return "", toObjectErr(err, minioMetaBucket, fsMetaPath)
+	}
 
-	// Loop through all parts, validate them and then commit to disk.
-	for i, part := range parts {
-		partIdx := fsMeta.ObjectPartIndex(part.PartNumber)
-		if partIdx == -1 {
-			return "", InvalidPart{}
+	fsAppendMeta, err := readFSMetadata(fs.storage, minioMetaBucket, fsAppendMetaPath)
+	if err == nil && isPartsSame(fsAppendMeta.Parts, parts) {
+		fsAppendDataPath := getFSAppendDataPath(uploadID)
+		if err = fs.storage.RenameFile(minioMetaBucket, fsAppendDataPath, bucket, object); err != nil {
+			return "", toObjectErr(err, minioMetaBucket, fsAppendDataPath)
 		}
-		if fsMeta.Parts[partIdx].ETag != part.ETag {
-			return "", BadDigest{}
-		}
-		// All parts except the last part has to be atleast 5MB.
-		if (i < len(parts)-1) && !isMinAllowedPartSize(fsMeta.Parts[partIdx].Size) {
-			return "", PartTooSmall{}
-		}
-		// Construct part suffix.
-		partSuffix := fmt.Sprintf("object%d", part.PartNumber)
-		multipartPartFile := path.Join(mpartMetaPrefix, bucket, object, uploadID, partSuffix)
-		offset := int64(0)
-		totalLeft := fsMeta.Parts[partIdx].Size
-		for totalLeft > 0 {
-			var n int64
-			n, err = fs.storage.ReadFile(minioMetaBucket, multipartPartFile, offset, buffer)
-			if err != nil {
-				if err == errFileNotFound {
-					return "", InvalidPart{}
+		// Remove the append-file metadata file in tmp location as we no longer need it.
+		fs.storage.DeleteFile(minioMetaBucket, fsAppendMetaPath)
+	} else {
+		tempObj := path.Join(tmpMetaPrefix, uploadID+"-"+"part.1")
+
+		bufp := completeBufPool.Get().(*[]byte)
+		buf := *bufp
+		defer completeBufPool.Put(bufp)
+
+		// Loop through all parts, validate them and then commit to disk.
+		for i, part := range parts {
+			partIdx := fsMeta.ObjectPartIndex(part.PartNumber)
+			if partIdx == -1 {
+				return "", InvalidPart{}
+			}
+			if fsMeta.Parts[partIdx].ETag != part.ETag {
+				return "", BadDigest{}
+			}
+			// All parts except the last part has to be atleast 5MB.
+			if (i < len(parts)-1) && !isMinAllowedPartSize(fsMeta.Parts[partIdx].Size) {
+				return "", PartTooSmall{
+					PartNumber: part.PartNumber,
+					PartSize:   fsMeta.Parts[partIdx].Size,
+					PartETag:   part.ETag,
 				}
-				return "", toObjectErr(err, minioMetaBucket, multipartPartFile)
 			}
-			n, err = fs.storage.AppendFile(minioMetaBucket, tempObj, buffer[:n])
-			if err != nil {
-				return "", toObjectErr(err, minioMetaBucket, tempObj)
+			// Construct part suffix.
+			partSuffix := fmt.Sprintf("object%d", part.PartNumber)
+			multipartPartFile := path.Join(mpartMetaPrefix, bucket, object, uploadID, partSuffix)
+			offset := int64(0)
+			totalLeft := fsMeta.Parts[partIdx].Size
+			for totalLeft > 0 {
+				curLeft := int64(readSizeV1)
+				if totalLeft < readSizeV1 {
+					curLeft = totalLeft
+				}
+				var n int64
+				n, err = fs.storage.ReadFile(minioMetaBucket, multipartPartFile, offset, buf[:curLeft])
+				if n > 0 {
+					if err = fs.storage.AppendFile(minioMetaBucket, tempObj, buf[:n]); err != nil {
+						return "", toObjectErr(err, minioMetaBucket, tempObj)
+					}
+				}
+				if err != nil {
+					if err == io.EOF || err == io.ErrUnexpectedEOF {
+						break
+					}
+					if err == errFileNotFound {
+						return "", InvalidPart{}
+					}
+					return "", toObjectErr(err, minioMetaBucket, multipartPartFile)
+				}
+				offset += n
+				totalLeft -= n
 			}
-			offset += n
-			totalLeft -= n
+		}
+
+		// Rename the file back to original location, if not delete the temporary object.
+		err = fs.storage.RenameFile(minioMetaBucket, tempObj, bucket, object)
+		if err != nil {
+			if dErr := fs.storage.DeleteFile(minioMetaBucket, tempObj); dErr != nil {
+				return "", toObjectErr(dErr, minioMetaBucket, tempObj)
+			}
+			return "", toObjectErr(err, bucket, object)
 		}
 	}
 
-	// Rename the file back to original location, if not delete the temporary object.
-	err = fs.storage.RenameFile(minioMetaBucket, tempObj, bucket, object)
-	if err != nil {
-		if dErr := fs.storage.DeleteFile(minioMetaBucket, tempObj); dErr != nil {
-			return "", toObjectErr(dErr, minioMetaBucket, tempObj)
+	// No need to save part info, since we have concatenated all parts.
+	fsMeta.Parts = nil
+
+	// Save additional metadata only if extended headers such as "X-Amz-Meta-" are set.
+	if hasExtendedHeader(fsMeta.Meta) {
+		if len(fsMeta.Meta) == 0 {
+			fsMeta.Meta = make(map[string]string)
+		}
+		fsMeta.Meta["md5Sum"] = s3MD5
+
+		fsMetaPath = path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile)
+		if err = writeFSMetadata(fs.storage, minioMetaBucket, fsMetaPath, fsMeta); err != nil {
+			return "", toObjectErr(err, bucket, object)
 		}
-		return "", toObjectErr(err, bucket, object)
 	}
 
 	// Cleanup all the parts if everything else has been safely committed.
 	if err = cleanupUploadedParts(bucket, object, uploadID, fs.storage); err != nil {
-		return "", err
+		return "", toObjectErr(err, bucket, object)
 	}
 
 	// Hold the lock so that two parallel complete-multipart-uploads do not
@@ -561,7 +778,7 @@ func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, upload
 		uploadsJSON.Uploads = append(uploadsJSON.Uploads[:uploadIDIdx], uploadsJSON.Uploads[uploadIDIdx+1:]...)
 	}
 	if len(uploadsJSON.Uploads) > 0 {
-		if err = updateUploadsJSON(bucket, object, uploadsJSON, fs.storage); err != nil {
+		if err = fs.updateUploadsJSON(bucket, object, uploadsJSON); err != nil {
 			return "", toObjectErr(err, minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object))
 		}
 		// Return success.
@@ -597,7 +814,7 @@ func (fs fsObjects) abortMultipartUpload(bucket, object, uploadID string) error
 		// There are pending uploads for the same object, preserve
 		// them update 'uploads.json' in-place.
 		if len(uploadsJSON.Uploads) > 0 {
-			err = updateUploadsJSON(bucket, object, uploadsJSON, fs.storage)
+			err = fs.updateUploadsJSON(bucket, object, uploadsJSON)
 			if err != nil {
 				return toObjectErr(err, bucket, object)
 			}
@@ -643,6 +860,11 @@ func (fs fsObjects) AbortMultipartUpload(bucket, object, uploadID string) error
 		return InvalidUploadID{UploadID: uploadID}
 	}
 
+	fsAppendMetaPath := getFSAppendMetaPath(uploadID)
+	// Lock fs-append.json so that no parallel appendParts() is being done.
+	nsMutex.Lock(minioMetaBucket, fsAppendMetaPath)
+	defer nsMutex.Unlock(minioMetaBucket, fsAppendMetaPath)
+
 	err := fs.abortMultipartUpload(bucket, object, uploadID)
 	return err
 }

cmd/fs-v1.go

@@ -0,0 +1,682 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"io"
+	"os"
+	"path"
+	"sort"
+	"strings"
+	"sync"
+
+	"github.com/minio/minio/pkg/disk"
+	"github.com/minio/minio/pkg/mimedb"
+)
+
+// fsObjects - Implements fs object layer.
+type fsObjects struct {
+	storage      StorageAPI
+	physicalDisk string
+
+	// List pool management.
+	listPool *treeWalkPool
+}
+
+// creates format.json, the FS format info in minioMetaBucket.
+func initFormatFS(storageDisk StorageAPI) error {
+	return writeFSFormatData(storageDisk, newFSFormatV1())
+}
+
+// loads format.json from minioMetaBucket if it exists.
+func loadFormatFS(storageDisk StorageAPI) (format formatConfigV1, err error) {
+	// Reads entire `format.json`.
+	buf, err := storageDisk.ReadAll(minioMetaBucket, fsFormatJSONFile)
+	if err != nil {
+		return formatConfigV1{}, err
+	}
+
+	// Unmarshal format config.
+	if err = json.Unmarshal(buf, &format); err != nil {
+		return formatConfigV1{}, err
+	}
+
+	// Return structured `format.json`.
+	return format, nil
+}
+
+// newFSObjects - initialize new fs object layer.
+func newFSObjects(disk string) (ObjectLayer, error) {
+	storage, err := newStorageAPI(disk)
+	if err != nil && err != errDiskNotFound {
+		return nil, err
+	}
+
+	// Attempt to create `.minio`.
+	err = storage.MakeVol(minioMetaBucket)
+	if err != nil {
+		switch err {
+		// Ignore the errors.
+		case errVolumeExists, errDiskNotFound, errFaultyDisk:
+		default:
+			return nil, toObjectErr(err, minioMetaBucket)
+		}
+	}
+
+	// Runs house keeping code, like creating minioMetaBucket, cleaning up tmp files etc.
+	if err = fsHouseKeeping(storage); err != nil {
+		return nil, err
+	}
+
+	// loading format.json from minioMetaBucket.
+	// Note: The format.json content is ignored, reserved for future use.
+	format, err := loadFormatFS(storage)
+	if err != nil {
+		if err == errFileNotFound {
+			// format.json doesn't exist, create it inside minioMetaBucket.
+			err = initFormatFS(storage)
+			if err != nil {
+				return nil, err
+			}
+		} else {
+			return nil, err
+		}
+	} else if !isFSFormat(format) {
+		return nil, errFSDiskFormat
+	}
+
+	// Initialize fs objects.
+	fs := fsObjects{
+		storage:      storage,
+		physicalDisk: disk,
+		listPool:     newTreeWalkPool(globalLookupTimeout),
+	}
+
+	// Return successfully initialized object layer.
+	return fs, nil
+}
+
+// Should be called when process shuts down.
+func (fs fsObjects) Shutdown() error {
+	// List if there are any multipart entries.
+	_, err := fs.storage.ListDir(minioMetaBucket, mpartMetaPrefix)
+	if err != errFileNotFound {
+		// Multipart directory is not empty hence do not remove '.minio.sys' volume.
+		return nil
+	}
+	// List if there are any bucket configuration entries.
+	_, err = fs.storage.ListDir(minioMetaBucket, bucketConfigPrefix)
+	if err != errFileNotFound {
+		// Bucket config directory is not empty hence do not remove '.minio.sys' volume.
+		return nil
+	}
+	// Cleanup everything else.
+	prefix := ""
+	if err = cleanupDir(fs.storage, minioMetaBucket, prefix); err != nil {
+		errorIf(err, "Unable to cleanup minio meta bucket")
+		return err
+	}
+	if err = fs.storage.DeleteVol(minioMetaBucket); err != nil {
+		if err != errVolumeNotEmpty {
+			errorIf(err, "Unable to delete minio meta bucket %s", minioMetaBucket)
+			return err
+		}
+	}
+	// Successful.
+	return nil
+}
+
+// StorageInfo - returns underlying storage statistics.
+func (fs fsObjects) StorageInfo() StorageInfo {
+	info, err := disk.GetInfo(fs.physicalDisk)
+	fatalIf(err, "Unable to get disk info "+fs.physicalDisk)
+	return StorageInfo{
+		Total: info.Total,
+		Free:  info.Free,
+	}
+}
+
+/// Bucket operations
+
+// MakeBucket - make a bucket.
+func (fs fsObjects) MakeBucket(bucket string) error {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+	if err := fs.storage.MakeVol(bucket); err != nil {
+		return toObjectErr(err, bucket)
+	}
+	return nil
+}
+
+// GetBucketInfo - get bucket info.
+func (fs fsObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return BucketInfo{}, BucketNameInvalid{Bucket: bucket}
+	}
+	vi, err := fs.storage.StatVol(bucket)
+	if err != nil {
+		return BucketInfo{}, toObjectErr(err, bucket)
+	}
+	return BucketInfo{
+		Name:    bucket,
+		Created: vi.Created,
+	}, nil
+}
+
+// ListBuckets - list buckets.
+func (fs fsObjects) ListBuckets() ([]BucketInfo, error) {
+	var bucketInfos []BucketInfo
+	vols, err := fs.storage.ListVols()
+	if err != nil {
+		return nil, toObjectErr(err)
+	}
+	for _, vol := range vols {
+		// StorageAPI can send volume names which are incompatible
+		// with buckets, handle it and skip them.
+		if !IsValidBucketName(vol.Name) {
+			continue
+		}
+		// Ignore the volume special bucket.
+		if vol.Name == minioMetaBucket {
+			continue
+		}
+		bucketInfos = append(bucketInfos, BucketInfo{
+			Name:    vol.Name,
+			Created: vol.Created,
+		})
+	}
+	sort.Sort(byBucketName(bucketInfos))
+	return bucketInfos, nil
+}
+
+// DeleteBucket - delete a bucket.
+func (fs fsObjects) DeleteBucket(bucket string) error {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+	// Attempt to delete regular bucket.
+	if err := fs.storage.DeleteVol(bucket); err != nil {
+		return toObjectErr(err, bucket)
+	}
+	// Cleanup all the previously incomplete multiparts.
+	if err := cleanupDir(fs.storage, path.Join(minioMetaBucket, mpartMetaPrefix), bucket); err != nil && err != errVolumeNotFound {
+		return toObjectErr(err, bucket)
+	}
+	return nil
+}
+
+/// Object Operations
+
+var getBufPool = sync.Pool{
+	New: func() interface{} {
+		b := make([]byte, readSizeV1)
+		return &b
+	},
+}
+
+// GetObject - get an object.
+func (fs fsObjects) GetObject(bucket, object string, offset int64, length int64, writer io.Writer) (err error) {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+	// Verify if object is valid.
+	if !IsValidObjectName(object) {
+		return ObjectNameInvalid{Bucket: bucket, Object: object}
+	}
+	// Offset and length cannot be negative.
+	if offset < 0 || length < 0 {
+		return toObjectErr(errUnexpected, bucket, object)
+	}
+	// Writer cannot be nil.
+	if writer == nil {
+		return toObjectErr(errUnexpected, bucket, object)
+	}
+
+	// Stat the file to get file size.
+	fi, err := fs.storage.StatFile(bucket, object)
+	if err != nil {
+		return toObjectErr(err, bucket, object)
+	}
+
+	// Reply back invalid range if the input offset and length fall out of range.
+	if offset > fi.Size || length > fi.Size {
+		return InvalidRange{offset, length, fi.Size}
+	}
+	// Reply if we have inputs with offset and length falling out of file size range.
+	if offset+length > fi.Size {
+		return InvalidRange{offset, length, fi.Size}
+	}
+
+	var totalLeft = length
+	bufSize := int64(readSizeV1)
+	if length > 0 && bufSize > length {
+		bufSize = length
+	}
+
+	// Allocate a staging buffer.
+	bufp := getBufPool.Get().(*[]byte)
+	buf := *bufp
+	defer getBufPool.Put(bufp)
+	for {
+		// Figure out the right size for the buffer.
+		curLeft := bufSize
+		if totalLeft < bufSize {
+			curLeft = totalLeft
+		}
+		// Reads the file at offset.
+		nr, er := fs.storage.ReadFile(bucket, object, offset, buf[:curLeft])
+		if nr > 0 {
+			// Write to response writer.
+			nw, ew := writer.Write(buf[0:nr])
+			if nw > 0 {
+				// Decrement whats left to write.
+				totalLeft -= int64(nw)
+
+				// Progress the offset
+				offset += int64(nw)
+			}
+			if ew != nil {
+				err = ew
+				break
+			}
+			if nr != int64(nw) {
+				err = io.ErrShortWrite
+				break
+			}
+		}
+		if er == io.EOF || er == io.ErrUnexpectedEOF {
+			break
+		}
+		if er != nil {
+			err = er
+			break
+		}
+		if totalLeft == 0 {
+			break
+		}
+	}
+	// Returns any error.
+	return toObjectErr(err, bucket, object)
+}
+
+// GetObjectInfo - get object info.
+func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return ObjectInfo{}, (BucketNameInvalid{Bucket: bucket})
+	}
+	// Verify if object is valid.
+	if !IsValidObjectName(object) {
+		return ObjectInfo{}, (ObjectNameInvalid{Bucket: bucket, Object: object})
+	}
+	fi, err := fs.storage.StatFile(bucket, object)
+	if err != nil {
+		return ObjectInfo{}, toObjectErr(err, bucket, object)
+	}
+	fsMeta, err := readFSMetadata(fs.storage, minioMetaBucket, path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile))
+	if err != nil && err != errFileNotFound {
+		return ObjectInfo{}, toObjectErr(err, bucket, object)
+	}
+
+	if len(fsMeta.Meta) == 0 {
+		fsMeta.Meta = make(map[string]string)
+	}
+
+	// Guess content-type from the extension if possible.
+	if fsMeta.Meta["content-type"] == "" {
+		if objectExt := path.Ext(object); objectExt != "" {
+			if content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]; ok {
+				fsMeta.Meta["content-type"] = content.ContentType
+			}
+		}
+	}
+
+	// Guess content-type from the extension if possible.
+	return ObjectInfo{
+		Bucket:          bucket,
+		Name:            object,
+		ModTime:         fi.ModTime,
+		Size:            fi.Size,
+		IsDir:           fi.Mode.IsDir(),
+		MD5Sum:          fsMeta.Meta["md5Sum"],
+		ContentType:     fsMeta.Meta["content-type"],
+		ContentEncoding: fsMeta.Meta["content-encoding"],
+		UserDefined:     fsMeta.Meta,
+	}, nil
+}
+
+var putBufPool = sync.Pool{
+	New: func() interface{} {
+		b := make([]byte, readSizeV1)
+		return &b
+	},
+}
+
+// PutObject - saves an object atomically of size - size bytes.
+// With size bytes of '-1' this function reads till EOF.
+func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (string, error) {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return "", BucketNameInvalid{Bucket: bucket}
+	}
+	if !IsValidObjectName(object) {
+		return "", ObjectNameInvalid{
+			Bucket: bucket,
+			Object: object,
+		}
+	}
+	// No metadata is set, allocate a new one.
+	if metadata == nil {
+		metadata = make(map[string]string)
+	}
+
+	uniqueID := getUUID()
+
+	// Uploaded object will first be written to the temporary location which will eventually
+	// be renamed to the actual location. It is first written to the temporary location
+	// so that cleaning it up will be easy if the server goes down.
+	tempObj := path.Join(tmpMetaPrefix, uniqueID)
+
+	// Initialize md5 writer.
+	md5Writer := md5.New()
+
+	// Limit the reader to its provided size if specified.
+	var limitDataReader io.Reader
+	if size > 0 {
+		// This is done so that we can avoid erroneous clients sending more data than the set content size.
+		limitDataReader = io.LimitReader(data, size)
+	} else {
+		// else we read till EOF.
+		limitDataReader = data
+	}
+
+	if size == 0 {
+		// For size 0 we write a 0byte file.
+		err := fs.storage.AppendFile(minioMetaBucket, tempObj, []byte(""))
+		if err != nil {
+			return "", toObjectErr(err, bucket, object)
+		}
+	} else {
+		// Allocate a buffer to Read() from request body
+		bufSize := int64(readSizeV1)
+		if size > 0 && bufSize > size {
+			bufSize = size
+		}
+		bufp := putBufPool.Get().(*[]byte)
+		buf := *bufp
+		defer putBufPool.Put(bufp)
+
+		teeReader := io.TeeReader(limitDataReader, md5Writer)
+		bytesWritten, err := fsCreateFile(fs.storage, teeReader, buf[:bufSize], minioMetaBucket, tempObj)
+		if err != nil {
+			fs.storage.DeleteFile(minioMetaBucket, tempObj)
+			return "", toObjectErr(err, bucket, object)
+		}
+
+		// Should return IncompleteBody{} error when reader has fewer
+		// bytes than specified in request header.
+		if bytesWritten < size {
+			fs.storage.DeleteFile(minioMetaBucket, tempObj)
+			return "", IncompleteBody{}
+		}
+	}
+
+	newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
+	// Update the md5sum if not set with the newly calculated one.
+	if len(metadata["md5Sum"]) == 0 {
+		metadata["md5Sum"] = newMD5Hex
+	}
+
+	// Validate if payload is valid.
+	if isSignVerify(data) {
+		if vErr := data.(*signVerifyReader).Verify(); vErr != nil {
+			// Incoming payload wrong, delete the temporary object.
+			fs.storage.DeleteFile(minioMetaBucket, tempObj)
+			// Error return.
+			return "", toObjectErr(vErr, bucket, object)
+		}
+	}
+
+	// md5Hex representation.
+	md5Hex := metadata["md5Sum"]
+	if md5Hex != "" {
+		if newMD5Hex != md5Hex {
+			// MD5 mismatch, delete the temporary object.
+			fs.storage.DeleteFile(minioMetaBucket, tempObj)
+			// Returns md5 mismatch.
+			return "", BadDigest{md5Hex, newMD5Hex}
+		}
+	}
+
+	// Entire object was written to the temp location, now it's safe to rename it to the actual location.
+	err := fs.storage.RenameFile(minioMetaBucket, tempObj, bucket, object)
+	if err != nil {
+		return "", toObjectErr(err, bucket, object)
+	}
+
+	// Save additional metadata only if extended headers such as "X-Amz-Meta-" are set.
+	if hasExtendedHeader(metadata) {
+		// Initialize `fs.json` values.
+		fsMeta := newFSMetaV1()
+		fsMeta.Meta = metadata
+
+		fsMetaPath := path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile)
+		if err = writeFSMetadata(fs.storage, minioMetaBucket, fsMetaPath, fsMeta); err != nil {
+			return "", toObjectErr(err, bucket, object)
+		}
+	}
+
+	// Return md5sum, successfully wrote object.
+	return newMD5Hex, nil
+}
+
+// DeleteObject - deletes an object from a bucket, this operation is destructive
+// and there are no rollbacks supported.
+func (fs fsObjects) DeleteObject(bucket, object string) error {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+	if !IsValidObjectName(object) {
+		return ObjectNameInvalid{Bucket: bucket, Object: object}
+	}
+	err := fs.storage.DeleteFile(minioMetaBucket, path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile))
+	if err != nil && err != errFileNotFound {
+		return toObjectErr(err, bucket, object)
+	}
+	if err = fs.storage.DeleteFile(bucket, object); err != nil {
+		return toObjectErr(err, bucket, object)
+	}
+	return nil
+}
+
+// Checks whether bucket exists.
+func isBucketExist(storage StorageAPI, bucketName string) bool {
+	// Check whether bucket exists.
+	_, err := storage.StatVol(bucketName)
+	if err != nil {
+		if err == errVolumeNotFound {
+			return false
+		}
+		errorIf(err, "Stat failed on bucket "+bucketName+".")
+		return false
+	}
+	return true
+}
+
+// ListObjects - list all objects at prefix upto maxKeys., optionally delimited by '/'. Maintains the list pool
+// state for future re-entrant list requests.
+func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
+	// Convert entry to FileInfo
+	entryToFileInfo := func(entry string) (fileInfo FileInfo, err error) {
+		if strings.HasSuffix(entry, slashSeparator) {
+			// Object name needs to be full path.
+			fileInfo.Name = entry
+			fileInfo.Mode = os.ModeDir
+			return
+		}
+		if fileInfo, err = fs.storage.StatFile(bucket, entry); err != nil {
+			return
+		}
+		fsMeta, mErr := readFSMetadata(fs.storage, minioMetaBucket, path.Join(bucketMetaPrefix, bucket, entry, fsMetaJSONFile))
+		if mErr != nil && mErr != errFileNotFound {
+			return FileInfo{}, mErr
+		}
+		if len(fsMeta.Meta) == 0 {
+			fsMeta.Meta = make(map[string]string)
+		}
+		// Object name needs to be full path.
+		fileInfo.Name = entry
+		fileInfo.MD5Sum = fsMeta.Meta["md5Sum"]
+		return
+	}
+
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
+	}
+	// Verify if bucket exists.
+	if !isBucketExist(fs.storage, bucket) {
+		return ListObjectsInfo{}, BucketNotFound{Bucket: bucket}
+	}
+	if !IsValidObjectPrefix(prefix) {
+		return ListObjectsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
+	}
+	// Verify if delimiter is anything other than '/', which we do not support.
+	if delimiter != "" && delimiter != slashSeparator {
+		return ListObjectsInfo{}, UnsupportedDelimiter{
+			Delimiter: delimiter,
+		}
+	}
+	// Verify if marker has prefix.
+	if marker != "" {
+		if !strings.HasPrefix(marker, prefix) {
+			return ListObjectsInfo{}, InvalidMarkerPrefixCombination{
+				Marker: marker,
+				Prefix: prefix,
+			}
+		}
+	}
+
+	// With max keys of zero we have reached eof, return right here.
+	if maxKeys == 0 {
+		return ListObjectsInfo{}, nil
+	}
+
+	// For delimiter and prefix as '/' we do not list anything at all
+	// since according to s3 spec we stop at the 'delimiter'
+	// along // with the prefix. On a flat namespace with 'prefix'
+	// as '/' we don't have any entries, since all the keys are
+	// of form 'keyName/...'
+	if delimiter == slashSeparator && prefix == slashSeparator {
+		return ListObjectsInfo{}, nil
+	}
+
+	// Over flowing count - reset to maxObjectList.
+	if maxKeys < 0 || maxKeys > maxObjectList {
+		maxKeys = maxObjectList
+	}
+
+	// Default is recursive, if delimiter is set then list non recursive.
+	recursive := true
+	if delimiter == slashSeparator {
+		recursive = false
+	}
+
+	heal := false // true only for xl.ListObjectsHeal()
+	walkResultCh, endWalkCh := fs.listPool.Release(listParams{bucket, recursive, marker, prefix, heal})
+	if walkResultCh == nil {
+		endWalkCh = make(chan struct{})
+		isLeaf := func(bucket, object string) bool {
+			// bucket argument is unused as we don't need to StatFile
+			// to figure if it's a file, just need to check that the
+			// object string does not end with "/".
+			return !strings.HasSuffix(object, slashSeparator)
+		}
+		listDir := listDirFactory(isLeaf, fs.storage)
+		walkResultCh = startTreeWalk(bucket, prefix, marker, recursive, listDir, isLeaf, endWalkCh)
+	}
+	var fileInfos []FileInfo
+	var eof bool
+	var nextMarker string
+	for i := 0; i < maxKeys; {
+		walkResult, ok := <-walkResultCh
+		if !ok {
+			// Closed channel.
+			eof = true
+			break
+		}
+		// For any walk error return right away.
+		if walkResult.err != nil {
+			// File not found is a valid case.
+			if walkResult.err == errFileNotFound {
+				return ListObjectsInfo{}, nil
+			}
+			return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
+		}
+		fileInfo, err := entryToFileInfo(walkResult.entry)
+		if err != nil {
+			return ListObjectsInfo{}, nil
+		}
+		nextMarker = fileInfo.Name
+		fileInfos = append(fileInfos, fileInfo)
+		if walkResult.end {
+			eof = true
+			break
+		}
+		i++
+	}
+	params := listParams{bucket, recursive, nextMarker, prefix, heal}
+	if !eof {
+		fs.listPool.Set(params, walkResultCh, endWalkCh)
+	}
+
+	result := ListObjectsInfo{IsTruncated: !eof}
+	for _, fileInfo := range fileInfos {
+		result.NextMarker = fileInfo.Name
+		if fileInfo.Mode.IsDir() {
+			result.Prefixes = append(result.Prefixes, fileInfo.Name)
+			continue
+		}
+		result.Objects = append(result.Objects, ObjectInfo{
+			Name:    fileInfo.Name,
+			ModTime: fileInfo.ModTime,
+			Size:    fileInfo.Size,
+			MD5Sum:  fileInfo.MD5Sum,
+			IsDir:   false,
+		})
+	}
+	return result, nil
+}
+
+// HealObject - no-op for fs. Valid only for XL.
+func (fs fsObjects) HealObject(bucket, object string) error {
+	return NotImplemented{}
+}
+
+// HealListObjects - list objects for healing. Valid only for XL
+func (fs fsObjects) ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
+	return ListObjectsInfo{}, NotImplemented{}
+}

cmd/fs-v1_test.go

@@ -0,0 +1,61 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// TestNewFS - tests initialization of all input disks
+// and constructs a valid `FS` object layer.
+func TestNewFS(t *testing.T) {
+	// Do not attempt to create this path, the test validates
+	// so that newFSObjects initializes non existing paths
+	// and successfully returns initialized object layer.
+	disk := filepath.Join(os.TempDir(), "minio-"+nextSuffix())
+	defer removeAll(disk)
+
+	// Setup to test errFSDiskFormat.
+	disks := []string{}
+	for i := 0; i < 6; i++ {
+		xlDisk := filepath.Join(os.TempDir(), "minio-"+nextSuffix())
+		defer removeAll(xlDisk)
+		disks = append(disks, xlDisk)
+	}
+
+	// Initializes all disks with XL
+	_, err := newXLObjects(disks, nil)
+	if err != nil {
+		t.Fatalf("Unable to initialize XL object, %s", err)
+	}
+
+	testCases := []struct {
+		disk        string
+		expectedErr error
+	}{
+		{disk, nil},
+		{disks[0], errFSDiskFormat},
+	}
+
+	for _, testCase := range testCases {
+		if _, err := newFSObjects(testCase.disk); err != testCase.expectedErr {
+			t.Fatalf("expected: %s, got: %s", testCase.expectedErr, err)
+		}
+	}
+}

cmd/generic-handlers.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"net/http"
@@ -39,6 +39,27 @@ func registerHandlers(mux *router.Router, handlerFns ...HandlerFunc) http.Handle
 	return f
 }
 
+// Adds limiting body size middleware
+
+// Set the body size limit to 6 Gb = Maximum object size + other possible data
+// in the same request
+const requestMaxBodySize = 1024 * 1024 * 1024 * (5 + 1)
+
+type requestSizeLimitHandler struct {
+	handler     http.Handler
+	maxBodySize int64
+}
+
+func setRequestSizeLimitHandler(h http.Handler) http.Handler {
+	return requestSizeLimitHandler{handler: h, maxBodySize: requestMaxBodySize}
+}
+
+func (h requestSizeLimitHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// Restricting read data to a given maximum length
+	r.Body = http.MaxBytesReader(w, r.Body, h.maxBodySize)
+	h.handler.ServeHTTP(w, r)
+}
+
 // Adds redirect rules for incoming requests.
 type redirectHandler struct {
 	handler        http.Handler
@@ -56,7 +77,7 @@ func setBrowserRedirectHandler(h http.Handler) http.Handler {
 
 func (h redirectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	// Re-direction handled specifically for browsers.
-	if strings.Contains(r.Header.Get("User-Agent"), "Mozilla") {
+	if strings.Contains(r.Header.Get("User-Agent"), "Mozilla") && !isRequestSignatureV4(r) {
 		// '/' is redirected to 'locationPrefix/'
 		// '/webrpc' is redirected to 'locationPrefix/webrpc'
 		// '/login' is redirected to 'locationPrefix/login'
@@ -141,7 +162,6 @@ func parseAmzDate(amzDateStr string) (amzDate time.Time, apiErr APIErrorCode) {
 // Supported Amz date headers.
 var amzDateHeaders = []string{
 	"x-amz-date",
-	"x-minio-date",
 	"date",
 }
 
@@ -178,9 +198,10 @@ func (h timeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			writeErrorResponse(w, r, apiErr, r.URL.Path)
 			return
 		}
-		// Verify if the request date header is more than 5minutes
-		// late, reject such clients.
-		if time.Now().UTC().Sub(amzDate)/time.Minute > time.Duration(5)*time.Minute {
+		// Verify if the request date header is shifted by less than maxSkewTime parameter in the past
+		// or in the future, reject request otherwise.
+		curTime := time.Now().UTC()
+		if curTime.Sub(amzDate) > maxSkewTime || amzDate.Sub(curTime) > maxSkewTime {
 			writeErrorResponse(w, r, ErrRequestTimeTooSkewed, r.URL.Path)
 			return
 		}
@@ -225,8 +246,8 @@ func (h resourceHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		bucketName = splits[0]
 		objectName = splits[1]
 	}
-	// If bucketName is present and not objectName check for bucket
-	// level resource queries.
+
+	// If bucketName is present and not objectName check for bucket level resource queries.
 	if bucketName != "" && objectName == "" {
 		if ignoreNotImplementedBucketResources(r) {
 			writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
@@ -245,6 +266,8 @@ func (h resourceHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
 		return
 	}
+
+	// Serve HTTP.
 	h.handler.ServeHTTP(w, r)
 }
 
@@ -276,7 +299,6 @@ var notimplementedBucketResourceNames = map[string]bool{
 	"cors":           true,
 	"lifecycle":      true,
 	"logging":        true,
-	"notification":   true,
 	"replication":    true,
 	"tagging":        true,
 	"versions":       true,

cmd/globals.go

@@ -14,24 +14,28 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
-import "github.com/fatih/color"
+import (
+	"time"
+
+	"github.com/fatih/color"
+	"github.com/minio/minio/pkg/objcache"
+)
 
 // Global constants for Minio.
 const (
-	minGoVersion = ">= 1.6" // Minio requires at least Go v1.6
+	minGoVersion = ">= 1.7" // Minio requires at least Go v1.7
 )
 
 // minio configuration related constants.
 const (
-	globalMinioConfigVersion = "4"
+	globalMinioConfigVersion = "7"
 	globalMinioConfigDir     = ".minio"
-	globalMinioCertsDir      = ".minio/certs"
+	globalMinioCertsDir      = "certs"
 	globalMinioCertFile      = "public.crt"
 	globalMinioKeyFile       = "private.key"
 	globalMinioConfigFile    = "config.json"
-	globalMinioProfilePath   = "profile"
 	// Add new global values here.
 )
 
@@ -39,11 +43,30 @@ var (
 	globalQuiet = false // Quiet flag set via command line
 	globalTrace = false // Trace flag set via environment setting.
 	// Add new global flags here.
+
+	// Maximum connections handled per
+	// server, defaults to 0 (unlimited).
+	globalMaxConn = 0
+	// Maximum cache size.
+	globalMaxCacheSize = uint64(maxCacheSize)
+	// Cache expiry.
+	globalCacheExpiry = objcache.DefaultExpiry
+	// Add new variable global values here.
+)
+
+var (
+	// Limit fields size (except file) to 1Mib since Policy document
+	// can reach that size according to https://aws.amazon.com/articles/1434
+	maxFormFieldSize = int64(1024 * 1024)
+)
+
+var (
+	// The maximum allowed difference between the request generation time and the server processing time
+	maxSkewTime = 15 * time.Minute
 )
 
 // global colors.
 var (
-	colorMagenta = color.New(color.FgMagenta, color.Bold).SprintfFunc()
-	colorWhite   = color.New(color.FgWhite, color.Bold).SprintfFunc()
-	colorGreen   = color.New(color.FgGreen, color.Bold).SprintfFunc()
+	colorBlue = color.New(color.FgBlue).SprintfFunc()
+	colorBold = color.New(color.Bold).SprintFunc()
 )

cmd/handler-utils.go

@@ -0,0 +1,145 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 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"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// Validates location constraint in PutBucket request body.
+// The location value in the request body should match the
+// region configured at serverConfig, otherwise error is returned.
+func isValidLocationConstraint(r *http.Request) (s3Error APIErrorCode) {
+	serverRegion := serverConfig.GetRegion()
+	// If the request has no body with content-length set to 0,
+	// we do not have to validate location constraint. Bucket will
+	// be created at default region.
+	if r.ContentLength == 0 {
+		return ErrNone
+	}
+	locationConstraint := createBucketLocationConfiguration{}
+	if err := xmlDecoder(r.Body, &locationConstraint, r.ContentLength); err != nil {
+		if err == io.EOF && r.ContentLength == -1 {
+			// EOF is a valid condition here when ContentLength is -1.
+			return ErrNone
+		}
+		errorIf(err, "Unable to xml decode location constraint")
+		// Treat all other failures as XML parsing errors.
+		return ErrMalformedXML
+	} // Successfully decoded, proceed to verify the region.
+
+	// Once region has been obtained we proceed to verify it.
+	incomingRegion := locationConstraint.Location
+	if incomingRegion == "" {
+		// Location constraint is empty for region "us-east-1",
+		// in accordance with protocol.
+		incomingRegion = "us-east-1"
+	}
+	// Return errInvalidRegion if location constraint does not match
+	// with configured region.
+	s3Error = ErrNone
+	if serverRegion != incomingRegion {
+		s3Error = ErrInvalidRegion
+	}
+	return s3Error
+}
+
+// Supported headers that needs to be extracted.
+var supportedHeaders = []string{
+	"content-type",
+	"cache-control",
+	"content-encoding",
+	"content-disposition",
+	// Add more supported headers here.
+}
+
+// extractMetadataFromHeader extracts metadata from HTTP header.
+func extractMetadataFromHeader(header http.Header) map[string]string {
+	metadata := make(map[string]string)
+	// Save standard supported headers.
+	for _, supportedHeader := range supportedHeaders {
+		canonicalHeader := http.CanonicalHeaderKey(supportedHeader)
+		// HTTP headers are case insensitive, look for both canonical
+		// and non canonical entries.
+		if _, ok := header[canonicalHeader]; ok {
+			metadata[supportedHeader] = header.Get(canonicalHeader)
+		} else if _, ok := header[supportedHeader]; ok {
+			metadata[supportedHeader] = header.Get(supportedHeader)
+		}
+	}
+	// Go through all other headers for any additional headers that needs to be saved.
+	for key := range header {
+		cKey := http.CanonicalHeaderKey(key)
+		if strings.HasPrefix(cKey, "X-Amz-Meta-") {
+			metadata[cKey] = header.Get(cKey)
+		} else if strings.HasPrefix(key, "X-Minio-Meta-") {
+			metadata[cKey] = header.Get(cKey)
+		}
+	}
+	// Return.
+	return metadata
+}
+
+// Extract form fields and file data from a HTTP POST Policy
+func extractPostPolicyFormValues(reader *multipart.Reader) (filePart io.Reader, fileName string, formValues map[string]string, err error) {
+	/// HTML Form values
+	formValues = make(map[string]string)
+	fileName = ""
+	for err == nil {
+		var part *multipart.Part
+		part, err = reader.NextPart()
+		if part != nil {
+			canonicalFormName := http.CanonicalHeaderKey(part.FormName())
+			if canonicalFormName != "File" {
+				var buffer []byte
+				limitReader := io.LimitReader(part, maxFormFieldSize+1)
+				buffer, err = ioutil.ReadAll(limitReader)
+				if err != nil {
+					return nil, "", nil, err
+				}
+				if int64(len(buffer)) > maxFormFieldSize {
+					return nil, "", nil, errSizeUnexpected
+				}
+				formValues[canonicalFormName] = string(buffer)
+			} else {
+				filePart = io.LimitReader(part, maxObjectSize)
+				fileName = part.FileName()
+				// As described in S3 spec, we expect file to be the last form field
+				break
+			}
+		}
+	}
+	return filePart, fileName, formValues, nil
+}
+
+// Send whitespace character, once every 5secs, until CompleteMultipartUpload is done.
+// CompleteMultipartUpload method of the object layer indicates that it's done via doneCh
+func sendWhiteSpaceChars(w http.ResponseWriter, doneCh <-chan struct{}) {
+	for {
+		select {
+		case <-time.After(5 * time.Second):
+			w.Write([]byte(" "))
+		case <-doneCh:
+			return
+		}
+	}
+}

cmd/handler-utils_test.go

@@ -14,18 +14,25 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"bytes"
 	"encoding/xml"
 	"io/ioutil"
 	"net/http"
+	"reflect"
 	"testing"
 )
 
 // Tests validate bucket LocationConstraint.
 func TestIsValidLocationContraint(t *testing.T) {
+	path, err := newTestConfig("us-east-1")
+	if err != nil {
+		t.Fatalf("unable initialize config file, %s", err)
+	}
+	defer removeAll(path)
+
 	// generates the input request with XML bucket configuration set to the request body.
 	createExpectedRequest := func(req *http.Request, location string) (*http.Request, error) {
 		createBucketConfig := createBucketLocationConfiguration{}
@@ -37,6 +44,7 @@ func TestIsValidLocationContraint(t *testing.T) {
 		}
 		createBucketConfigBuffer := bytes.NewBuffer(createBucketConfigBytes)
 		req.Body = ioutil.NopCloser(createBucketConfigBuffer)
+		req.ContentLength = int64(createBucketConfigBuffer.Len())
 		return req, nil
 	}
 
@@ -58,9 +66,43 @@ func TestIsValidLocationContraint(t *testing.T) {
 		if e != nil {
 			t.Fatalf("Test %d: Failed to Marshal bucket configuration", i+1)
 		}
-		actualCode := isValidLocationContraint(inputRequest.Body, testCase.serverConfigRegion)
+		serverConfig.SetRegion(testCase.serverConfigRegion)
+		actualCode := isValidLocationConstraint(inputRequest)
 		if testCase.expectedCode != actualCode {
 			t.Errorf("Test %d: Expected the APIErrCode to be %d, but instead found %d", i+1, testCase.expectedCode, actualCode)
 		}
 	}
 }
+
+// Tests validate metadata extraction from http headers.
+func TestExtractMetadataHeaders(t *testing.T) {
+	testCases := []struct {
+		header   http.Header
+		metadata map[string]string
+	}{
+		// Validate if there a known 'content-type'.
+		{
+			header: http.Header{
+				"Content-Type": []string{"image/png"},
+			},
+			metadata: map[string]string{
+				"content-type": "image/png",
+			},
+		},
+		// Validate if there are no keys to extract.
+		{
+			header: http.Header{
+				"test-1": []string{"123"},
+			},
+			metadata: map[string]string{},
+		},
+	}
+
+	// Validate if the extracting headers.
+	for i, testCase := range testCases {
+		metadata := extractMetadataFromHeader(testCase.header)
+		if !reflect.DeepEqual(metadata, testCase.metadata) {
+			t.Fatalf("Test %d failed: Expected \"%#v\", got \"%#v\"", i+1, testCase.metadata, metadata)
+		}
+	}
+}

cmd/host-to-ip.go

@@ -0,0 +1,42 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 (
+	"net"
+	"sort"
+)
+
+// byLastOctet implements sort.Interface used in sorting a list
+// of ip address by their last octet value.
+type byLastOctet []net.IP
+
+func (n byLastOctet) Len() int      { return len(n) }
+func (n byLastOctet) Swap(i, j int) { n[i], n[j] = n[j], n[i] }
+func (n byLastOctet) Less(i, j int) bool {
+	return []byte(n[i].To4())[3] < []byte(n[j].To4())[3]
+}
+
+// getIPsFromHosts - returns a reverse sorted list of ips based on the last octet value.
+func getIPsFromHosts(hosts []string) (ips []net.IP) {
+	for _, host := range hosts {
+		ips = append(ips, net.ParseIP(host))
+	}
+	// Reverse sort ips by their last octet.
+	sort.Sort(sort.Reverse(byLastOctet(ips)))
+	return ips
+}

cmd/host-to-ip_test.go

@@ -0,0 +1,61 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "testing"
+
+// Tests sorted list generated from hosts to ip.
+func TestHostToIP(t *testing.T) {
+	// Collection of test cases to validate last octet sorting.
+	testCases := []struct {
+		hosts       []string
+		sortedHosts []string
+	}{
+		{
+			// List of ip addresses that need to be sorted.
+			[]string{
+				"129.95.30.40",
+				"5.24.69.2",
+				"19.20.203.5",
+				"1.2.3.4",
+				"127.0.0.1",
+				"19.20.21.22",
+				"5.220.100.50",
+			},
+			// Numerical sorting result based on the last octet.
+			[]string{
+				"5.220.100.50",
+				"129.95.30.40",
+				"19.20.21.22",
+				"19.20.203.5",
+				"1.2.3.4",
+				"5.24.69.2",
+				"127.0.0.1",
+			},
+		},
+	}
+
+	// Tests the correct sorting behavior of getIPsFromHosts.
+	for j, testCase := range testCases {
+		ips := getIPsFromHosts(testCase.hosts)
+		for i, ip := range ips {
+			if ip.String() != testCase.sortedHosts[i] {
+				t.Fatalf("Test %d expected to pass but failed. Wanted ip %s, but got %s", j+1, testCase.sortedHosts[i], ip.String())
+			}
+		}
+	}
+}

cmd/httprange.go

@@ -0,0 +1,134 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 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 (
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+const (
+	byteRangePrefix = "bytes="
+)
+
+// Valid byte position regexp
+var validBytePos = regexp.MustCompile(`^[0-9]+$`)
+
+// HttpRange specifies the byte range to be sent to the client.
+type httpRange struct {
+	offsetBegin  int64
+	offsetEnd    int64
+	resourceSize int64
+}
+
+// String populate range stringer interface
+func (hrange httpRange) String() string {
+	return fmt.Sprintf("bytes %d-%d/%d", hrange.offsetBegin, hrange.offsetEnd, hrange.resourceSize)
+}
+
+// getlength - get length from the range.
+func (hrange httpRange) getLength() int64 {
+	return 1 + hrange.offsetEnd - hrange.offsetBegin
+}
+
+func parseRequestRange(rangeString string, resourceSize int64) (hrange *httpRange, err error) {
+	// Return error if given range string doesn't start with byte range prefix.
+	if !strings.HasPrefix(rangeString, byteRangePrefix) {
+		return nil, fmt.Errorf("'%s' does not start with '%s'", rangeString, byteRangePrefix)
+	}
+
+	// Trim byte range prefix.
+	byteRangeString := strings.TrimPrefix(rangeString, byteRangePrefix)
+
+	// Check if range string contains delimiter '-', else return error. eg. "bytes=8"
+	sepIndex := strings.Index(byteRangeString, "-")
+	if sepIndex == -1 {
+		return nil, fmt.Errorf("'%s' does not have a valid range value", rangeString)
+	}
+
+	offsetBeginString := byteRangeString[:sepIndex]
+	offsetBegin := int64(-1)
+	// Convert offsetBeginString only if its not empty.
+	if len(offsetBeginString) > 0 {
+		if !validBytePos.MatchString(offsetBeginString) {
+			return nil, fmt.Errorf("'%s' does not have a valid first byte position value", rangeString)
+		}
+
+		if offsetBegin, err = strconv.ParseInt(offsetBeginString, 10, 64); err != nil {
+			return nil, fmt.Errorf("'%s' does not have a valid first byte position value", rangeString)
+		}
+	}
+
+	offsetEndString := byteRangeString[sepIndex+1:]
+	offsetEnd := int64(-1)
+	// Convert offsetEndString only if its not empty.
+	if len(offsetEndString) > 0 {
+		if !validBytePos.MatchString(offsetEndString) {
+			return nil, fmt.Errorf("'%s' does not have a valid last byte position value", rangeString)
+		}
+
+		if offsetEnd, err = strconv.ParseInt(offsetEndString, 10, 64); err != nil {
+			return nil, fmt.Errorf("'%s' does not have a valid last byte position value", rangeString)
+		}
+	}
+
+	// rangeString contains first and last byte positions. eg. "bytes=2-5"
+	if offsetBegin > -1 && offsetEnd > -1 {
+		if offsetBegin > offsetEnd {
+			// Last byte position is not greater than first byte position. eg. "bytes=5-2"
+			return nil, fmt.Errorf("'%s' does not have valid range value", rangeString)
+		}
+
+		// First and last byte positions should not be >= resourceSize.
+		if offsetBegin >= resourceSize {
+			return nil, errInvalidRange
+		}
+
+		if offsetEnd >= resourceSize {
+			offsetEnd = resourceSize - 1
+		}
+	} else if offsetBegin > -1 {
+		// rangeString contains only first byte position. eg. "bytes=8-"
+		if offsetBegin >= resourceSize {
+			// First byte position should not be >= resourceSize.
+			return nil, errInvalidRange
+		}
+
+		offsetEnd = resourceSize - 1
+	} else if offsetEnd > -1 {
+		// rangeString contains only last byte position. eg. "bytes=-3"
+		if offsetEnd == 0 {
+			// Last byte position should not be zero eg. "bytes=-0"
+			return nil, errInvalidRange
+		}
+
+		if offsetEnd >= resourceSize {
+			offsetBegin = 0
+		} else {
+			offsetBegin = resourceSize - offsetEnd
+		}
+
+		offsetEnd = resourceSize - 1
+	} else {
+		// rangeString contains first and last byte positions missing. eg. "bytes=-"
+		return nil, fmt.Errorf("'%s' does not have valid range value", rangeString)
+	}
+
+	return &httpRange{offsetBegin, offsetEnd, resourceSize}, nil
+}

cmd/httprange_test.go

@@ -0,0 +1,90 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 "testing"
+
+// Test parseRequestRange()
+func TestParseRequestRange(t *testing.T) {
+	// Test success cases.
+	successCases := []struct {
+		rangeString string
+		offsetBegin int64
+		offsetEnd   int64
+		length      int64
+	}{
+		{"bytes=2-5", 2, 5, 4},
+		{"bytes=2-20", 2, 9, 8},
+		{"bytes=2-2", 2, 2, 1},
+		{"bytes=0000-0006", 0, 6, 7},
+		{"bytes=2-", 2, 9, 8},
+		{"bytes=-4", 6, 9, 4},
+		{"bytes=-20", 0, 9, 10},
+	}
+
+	for _, successCase := range successCases {
+		hrange, err := parseRequestRange(successCase.rangeString, 10)
+		if err != nil {
+			t.Fatalf("expected: <nil>, got: %s", err)
+		}
+
+		if hrange.offsetBegin != successCase.offsetBegin {
+			t.Fatalf("expected: %d, got: %d", successCase.offsetBegin, hrange.offsetBegin)
+		}
+
+		if hrange.offsetEnd != successCase.offsetEnd {
+			t.Fatalf("expected: %d, got: %d", successCase.offsetEnd, hrange.offsetEnd)
+		}
+		if hrange.getLength() != successCase.length {
+			t.Fatalf("expected: %d, got: %d", successCase.length, hrange.getLength())
+		}
+	}
+
+	// Test invalid range strings.
+	invalidRangeStrings := []string{
+		"bytes=8",
+		"bytes=5-2",
+		"bytes=+2-5",
+		"bytes=2-+5",
+		"bytes=2--5",
+		"bytes=-",
+		"",
+		"2-5",
+		"bytes = 2-5",
+		"bytes=2 - 5",
+		"bytes=0-0,-1",
+		"bytes=2-5 ",
+	}
+	for _, rangeString := range invalidRangeStrings {
+		if _, err := parseRequestRange(rangeString, 10); err == nil {
+			t.Fatalf("expected: an error, got: <nil>")
+		}
+	}
+
+	// Test error range strings.
+	errorRangeString := []string{
+		"bytes=10-10",
+		"bytes=20-30",
+		"bytes=20-",
+		"bytes=-0",
+	}
+	for _, rangeString := range errorRangeString {
+		if _, err := parseRequestRange(rangeString, 10); err != errInvalidRange {
+			t.Fatalf("expected: %s, got: %s", errInvalidRange, err)
+		}
+	}
+}

cmd/leak-detect_test.go

@@ -0,0 +1,154 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package leaktest provides tools to detect leaked goroutines in tests.
+// To use it, call "defer leaktest.AfterTest(t)()" at the beginning of each
+// test that may use goroutines.
+package cmd
+
+import (
+	"runtime"
+	"sort"
+	"strings"
+	"time"
+)
+
+const (
+	// deadline (in seconds) up to which the go routine leak detection has to be retried.
+	leakDetectDeadline = 5
+	// pause time (in milliseconds) between each snapshot at the end of the go routine leak detection.
+	leakDetectPauseTimeMs = 50
+)
+
+// LeakDetect - type with  methods for go routine leak detection.
+type LeakDetect struct {
+	relevantRoutines map[string]bool
+}
+
+// NewLeakDetect - Initialize a LeakDetector with the snapshot of relevant Go routines.
+func NewLeakDetect() LeakDetect {
+	snapshot := LeakDetect{
+		relevantRoutines: make(map[string]bool),
+	}
+	for _, g := range pickRelevantGoroutines() {
+		snapshot.relevantRoutines[g] = true
+	}
+	return snapshot
+}
+
+// CompareCurrentSnapshot - Compares the initial relevant stack trace with the current one (during the time of invocation).
+func (initialSnapShot LeakDetect) CompareCurrentSnapshot() []string {
+	var stackDiff []string
+	for _, g := range pickRelevantGoroutines() {
+		// Identify the Go routines those were not present in the initial snapshot.
+		// In other words a stack diff.
+		if !initialSnapShot.relevantRoutines[g] {
+			stackDiff = append(stackDiff, g)
+		}
+	}
+	return stackDiff
+}
+
+// DetectLeak - Creates a snapshot of runtiem stack and compares it with  the initial stack snapshot.
+func (initialSnapShot LeakDetect) DetectLeak(t TestErrHandler) {
+	if t.Failed() {
+		return
+	}
+	// Loop, waiting for goroutines to shut down.
+	// Wait up to 5 seconds, but finish as quickly as possible.
+	deadline := time.Now().Add(leakDetectDeadline * time.Second)
+	for {
+		// get sack snapshot of relevant go routines.
+		leaked := initialSnapShot.CompareCurrentSnapshot()
+		// current stack snapshot matches the initial one, no leaks, return.
+		if len(leaked) == 0 {
+			return
+		}
+		// wait a test again will deadline.
+		if time.Now().Before(deadline) {
+			time.Sleep(leakDetectPauseTimeMs * time.Millisecond)
+			continue
+		}
+		// after the deadline time report all the difference in the latest snapshot compared with the initial one.
+		for _, g := range leaked {
+			t.Errorf("Leaked goroutine: %v", g)
+		}
+		return
+	}
+}
+
+// DetectTestLeak -  snapshots the currently-running goroutines and returns a
+// function to be run at the end of tests to see whether any
+// goroutines leaked.
+// Usage: `defer DetectTestLeak(t)()` in beginning line of benchmarks or unit tests.
+func DetectTestLeak(t TestErrHandler) func() {
+	initialStackSnapShot := NewLeakDetect()
+	return func() {
+		initialStackSnapShot.DetectLeak(t)
+	}
+}
+
+// list of functions to be ignored from the stack trace.
+// Leak detection is done when tests are run, should ignore the tests related functions,
+// and other runtime functions while identifying leaks.
+var ignoredStackFns = []string{
+	"",
+	// Below are the stacks ignored by the upstream leaktest code.
+	"testing.Main(",
+	"testing.tRunner(",
+	"testing.tRunner(",
+	"runtime.goexit",
+	"created by runtime.gc",
+	// ignore the snapshot function.
+	// since the snapshot is taken here the entry will have the current function too.
+	"pickRelevantGoroutines",
+	"runtime.MHeap_Scavenger",
+	"signal.signal_recv",
+	"sigterm.handler",
+	"runtime_mcall",
+	"goroutine in C code",
+}
+
+// Identify whether the stack trace entry is part of ignoredStackFn .
+func isIgnoredStackFn(stack string) (ok bool) {
+	ok = true
+	for _, stackFn := range ignoredStackFns {
+		if !strings.Contains(stack, stackFn) {
+			ok = false
+			continue
+		}
+		break
+	}
+	return ok
+}
+
+// pickRelevantGoroutines returns all goroutines we care about for the purpose
+// of leak checking. It excludes testing or runtime ones.
+func pickRelevantGoroutines() (gs []string) {
+	// make a large buffer to hold the runtime stack info.
+	buf := make([]byte, 2<<20)
+	buf = buf[:runtime.Stack(buf, true)]
+	// runtime stack of go routines will be listed with 2 blank spaces between each of them, so split on "\n\n" .
+	for _, g := range strings.Split(string(buf), "\n\n") {
+		// Again split on a new line, the first line of the second half contaisn the info about the go routine.
+		sl := strings.SplitN(g, "\n", 2)
+		if len(sl) != 2 {
+			continue
+		}
+		stack := strings.TrimSpace(sl[1])
+		// ignore the testing go routine.
+		// since the tests will be invoking the leaktest it would contain the test go routine.
+		if strings.HasPrefix(stack, "testing.RunTests") {
+			continue
+		}
+		// Ignore the following go routines.
+		// testing and run time go routines should be ignored, only the application generated go routines should be taken into account.
+		if isIgnoredStackFn(stack) {
+			continue
+		}
+		gs = append(gs, g)
+	}
+	sort.Strings(gs)
+	return
+}

cmd/logger-console-hook.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"io/ioutil"

cmd/logger-file-hook.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"fmt"
@@ -39,7 +39,8 @@ func enableFileLogger() {
 		return
 	}
 
-	file, err := os.OpenFile(flogger.Filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0600)
+	// Creates the named file with mode 0666, honors system umask.
+	file, err := os.OpenFile(flogger.Filename, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0666)
 	fatalIf(err, "Unable to open log file.")
 
 	// Add a local file hook.

cmd/logger-syslog-hook_nix.go

@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"fmt"

cmd/logger-syslog-hook_windows.go

@@ -16,7 +16,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 type syslogLogger struct {
 	Enable bool   `json:"enable"`

cmd/logger.go

@@ -14,20 +14,15 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"bufio"
 	"bytes"
-	"os"
-	"reflect"
-	"runtime"
 	"runtime/debug"
-	"strconv"
 	"strings"
 
 	"github.com/Sirupsen/logrus"
-	"github.com/dustin/go-humanize"
 )
 
 type fields map[string]interface{}
@@ -40,7 +35,6 @@ var log = logrus.New() // Default console logger.
 //   - console [default]
 //   - file
 //   - syslog
-//
 type logger struct {
 	Console consoleLogger `json:"console"`
 	File    fileLogger    `json:"file"`
@@ -48,27 +42,6 @@ type logger struct {
 	// Add new loggers here.
 }
 
-// sysInfo returns useful system statistics.
-func sysInfo() map[string]string {
-	host, err := os.Hostname()
-	if err != nil {
-		host = ""
-	}
-	memstats := &runtime.MemStats{}
-	runtime.ReadMemStats(memstats)
-	return map[string]string{
-		"host.name":      host,
-		"host.os":        runtime.GOOS,
-		"host.arch":      runtime.GOARCH,
-		"host.lang":      runtime.Version(),
-		"host.cpus":      strconv.Itoa(runtime.NumCPU()),
-		"mem.used":       humanize.Bytes(memstats.Alloc),
-		"mem.total":      humanize.Bytes(memstats.Sys),
-		"mem.heap.used":  humanize.Bytes(memstats.HeapAlloc),
-		"mem.heap.total": humanize.Bytes(memstats.HeapSys),
-	}
-}
-
 // stackInfo returns printable stack trace.
 func stackInfo() string {
 	// Convert stack-trace bytes to io.Reader.
@@ -83,7 +56,7 @@ func stackInfo() string {
 	stackBuf.ReadFrom(rawStack)
 
 	// Strip GOPATH of the build system and return.
-	return strings.Replace(stackBuf.String(), minioGOPATH+"/src/", "", -1)
+	return strings.Replace(stackBuf.String(), GOPATH+"/src/", "", -1)
 }
 
 // errorIf synonymous with fatalIf but doesn't exit on error != nil
@@ -91,11 +64,8 @@ func errorIf(err error, msg string, data ...interface{}) {
 	if err == nil {
 		return
 	}
-	sysInfo := sysInfo()
 	fields := logrus.Fields{
-		"cause":   err.Error(),
-		"type":    reflect.TypeOf(err),
-		"sysInfo": sysInfo,
+		"cause": err.Error(),
 	}
 	if globalTrace {
 		fields["stack"] = "\n" + stackInfo()
@@ -108,11 +78,8 @@ func fatalIf(err error, msg string, data ...interface{}) {
 	if err == nil {
 		return
 	}
-	sysInfo := sysInfo()
 	fields := logrus.Fields{
-		"cause":   err.Error(),
-		"type":    reflect.TypeOf(err),
-		"sysInfo": sysInfo,
+		"cause": err.Error(),
 	}
 	if globalTrace {
 		fields["stack"] = "\n" + stackInfo()

cmd/logger_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"bytes"

cmd/main.go

@@ -0,0 +1,191 @@
+/*
+ * Minio Cloud Storage, (C) 2015, 2016 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 (
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/minio/cli"
+	"github.com/minio/mc/pkg/console"
+)
+
+var (
+	// global flags for minio.
+	minioFlags = []cli.Flag{
+		cli.BoolFlag{
+			Name:  "help, h",
+			Usage: "Show help.",
+		},
+	}
+)
+
+// Help template for minio.
+var minioHelpTemplate = `NAME:
+  {{.Name}} - {{.Usage}}
+
+DESCRIPTION:
+  {{.Description}}
+
+USAGE:
+  minio {{if .Flags}}[flags] {{end}}command{{if .Flags}}{{end}} [arguments...]
+
+COMMANDS:
+  {{range .Commands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
+  {{end}}{{if .Flags}}
+FLAGS:
+  {{range .Flags}}{{.}}
+  {{end}}{{end}}
+VERSION:
+  ` + Version +
+	`{{ "\n"}}`
+
+// init - check the environment before main starts
+func init() {
+	// Check if minio was compiled using a supported version of Golang.
+	checkGoVersion()
+
+	// Set global trace flag.
+	globalTrace = os.Getenv("MINIO_TRACE") == "1"
+}
+
+func migrate() {
+	// Migrate config file
+	migrateConfig()
+
+	// Migrate other configs here.
+}
+
+func enableLoggers() {
+	// Enable all loggers here.
+	enableConsoleLogger()
+	enableFileLogger()
+	// Add your logger here.
+}
+
+func findClosestCommands(command string) []string {
+	var closestCommands []string
+	for _, value := range commandsTree.PrefixMatch(command) {
+		closestCommands = append(closestCommands, value.(string))
+	}
+	sort.Strings(closestCommands)
+	// Suggest other close commands - allow missed, wrongly added and
+	// even transposed characters
+	for _, value := range commandsTree.walk(commandsTree.root) {
+		if sort.SearchStrings(closestCommands, value.(string)) < len(closestCommands) {
+			continue
+		}
+		// 2 is arbitrary and represents the max
+		// allowed number of typed errors
+		if DamerauLevenshteinDistance(command, value.(string)) < 2 {
+			closestCommands = append(closestCommands, value.(string))
+		}
+	}
+	return closestCommands
+}
+
+func registerApp() *cli.App {
+	// Register all commands.
+	registerCommand(serverCmd)
+	registerCommand(versionCmd)
+	registerCommand(updateCmd)
+	registerCommand(controlCmd)
+
+	// Set up app.
+	app := cli.NewApp()
+	app.Name = "Minio"
+	app.Author = "Minio.io"
+	app.Usage = "Cloud Storage Server."
+	app.Description = `Minio is an Amazon S3 compatible object storage server. Use it to store photos, videos, VMs, containers, log files, or any blob of data as objects.`
+	app.Flags = append(minioFlags, globalFlags...)
+	app.Commands = commands
+	app.CustomAppHelpTemplate = minioHelpTemplate
+	app.CommandNotFound = func(ctx *cli.Context, command string) {
+		msg := fmt.Sprintf("‘%s’ is not a minio sub-command. See ‘minio --help’.", command)
+		closestCommands := findClosestCommands(command)
+		if len(closestCommands) > 0 {
+			msg += fmt.Sprintf("\n\nDid you mean one of these?\n")
+			for _, cmd := range closestCommands {
+				msg += fmt.Sprintf("        ‘%s’\n", cmd)
+			}
+		}
+		console.Fatalln(msg)
+	}
+	return app
+}
+
+// Verify main command syntax.
+func checkMainSyntax(c *cli.Context) {
+	configPath, err := getConfigPath()
+	if err != nil {
+		console.Fatalf("Unable to obtain user's home directory. \nError: %s\n", err)
+	}
+	if configPath == "" {
+		console.Fatalln("Config folder cannot be empty, please specify --config-dir <foldername>.")
+	}
+}
+
+// Main main for minio server.
+func Main() {
+	app := registerApp()
+	app.Before = func(c *cli.Context) error {
+		// Sets new config folder.
+		setGlobalConfigPath(c.GlobalString("config-dir"))
+
+		// Valid input arguments to main.
+		checkMainSyntax(c)
+
+		// Migrate any old version of config / state files to newer format.
+		migrate()
+
+		// Initialize config.
+		err := initConfig()
+		fatalIf(err, "Unable to initialize minio config.")
+
+		// Enable all loggers by now.
+		enableLoggers()
+
+		// Set global quiet flag.
+		globalQuiet = c.Bool("quiet") || c.GlobalBool("quiet")
+
+		// Do not print update messages, if quiet flag is set.
+		if !globalQuiet {
+			if strings.HasPrefix(ReleaseTag, "RELEASE.") && c.Args().Get(0) != "update" {
+				updateMsg, _, err := getReleaseUpdate(minioUpdateStableURL, time.Second*1)
+				if err != nil {
+					// Ignore all network related errors.
+					return nil
+				}
+				if updateMsg.Update {
+					console.Println(updateMsg)
+				}
+			}
+		}
+		return nil
+	}
+
+	// Start profiler if env is set.
+	if profiler := os.Getenv("MINIO_PROFILER"); profiler != "" {
+		globalProfiler = startProfiler(profiler)
+	}
+
+	// Run the app - exit on error.
+	app.RunAndExitOnError()
+}

cmd/main_test.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"testing"

cmd/namespace-lock.go

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package main
+package cmd
 
 import (
 	"errors"
@@ -29,7 +29,7 @@ type nsParam struct {
 
 // nsLock - provides primitives for locking critical namespace regions.
 type nsLock struct {
-	*sync.RWMutex
+	sync.RWMutex
 	ref uint
 }
 
@@ -37,7 +37,7 @@ type nsLock struct {
 // Unlock, RLock and RUnlock.
 type nsLockMap struct {
 	lockMap map[nsParam]*nsLock
-	mutex   *sync.Mutex
+	mutex   sync.Mutex
 }
 
 // Global name space lock.
@@ -47,7 +47,6 @@ var nsMutex *nsLockMap
 func initNSLock() {
 	nsMutex = &nsLockMap{
 		lockMap: make(map[nsParam]*nsLock),
-		mutex:   &sync.Mutex{},
 	}
 }
 
@@ -59,8 +58,7 @@ func (n *nsLockMap) lock(volume, path string, readLock bool) {
 	nsLk, found := n.lockMap[param]
 	if !found {
 		nsLk = &nsLock{
-			RWMutex: &sync.RWMutex{},
-			ref:     0,
+			ref: 0,
 		}
 		n.lockMap[param] = nsLk
 	}