Implement x-amz-acl handling

pkg/api/errors.go

@@ -38,7 +38,7 @@ type ErrorResponse struct {
 	HostID    string
 }
 
-// Error codes, non exhaustive list
+// Error codes, non exhaustive list - http://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
 const (
 	AccessDenied = iota
 	BadDigest
@@ -63,6 +63,11 @@ const (
 	TooManyBuckets
 )
 
+// Error codes, non exhaustive list - standard HTTP errors
+const (
+	NotAcceptable = iota + 21
+)
+
 // Error code to Error structure map
 var errorCodeResponse = map[int]Error{
 	AccessDenied: {
@@ -170,6 +175,12 @@ var errorCodeResponse = map[int]Error{
 		Description:    "You have attempted to create more buckets than allowed.",
 		HTTPStatusCode: http.StatusBadRequest,
 	},
+	NotAcceptable: {
+		Code: "NotAcceptable",
+		Description: `The requested resource is only capable of generating content
+                              not acceptable according to the Accept headers sent in the request.`,
+		HTTPStatusCode: http.StatusNotAcceptable,
+	},
 }
 
 // errorCodeError provides errorCode to Error. It returns empty if the code provided is unknown