Merge master for release.

.travis.yml

@@ -18,6 +18,8 @@ env:
 script:
 ## Run all the tests
 - make
+- diff -au <(gofmt -d cmd) <(printf "")
+- diff -au <(gofmt -d pkg) <(printf "")
 - make test GOFLAGS="-timeout 15m -race -v"
 - make coverage
 

Dockerfile

@@ -1,5 +1,7 @@
 FROM alpine:3.5
 
+MAINTAINER Minio Inc <dev@minio.io>
+
 ENV GOPATH /go
 ENV PATH $PATH:$GOPATH/bin
 ENV CGO_ENABLED 0
@@ -9,10 +11,10 @@ WORKDIR /go/src/github.com/minio/
 RUN  \
      apk add --no-cache ca-certificates && \
      apk add --no-cache --virtual .build-deps git go musl-dev && \
+     echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
      go get -v -d github.com/minio/minio && \
      cd /go/src/github.com/minio/minio && \
-     git checkout release && \
-     go install -v -ldflags "-X github.com/minio/minio/cmd.Version=2017-05-05T01:14:51Z -X github.com/minio/minio/cmd.ReleaseTag=RELEASE.2017-05-05T01-14-51Z -X github.com/minio/minio/cmd.CommitID=40985cc4e3eec06b7ea82dc34c8d907fd2e7aa12" && \
+     go install -v -ldflags "$(go run buildscripts/gen-ldflags.go)" && \
      rm -rf /go/pkg /go/src /usr/local/go && apk del .build-deps
 
 EXPOSE 9000

Dockerfile.aarch64

@@ -1,5 +1,7 @@
 FROM resin/aarch64-alpine:3.5
 
+MAINTAINER Minio Inc <dev@minio.io>
+
 ENV GOPATH /go
 ENV PATH $PATH:$GOPATH/bin
 ENV CGO_ENABLED 0
@@ -9,9 +11,10 @@ WORKDIR /go/src/github.com/minio/
 RUN  \
      apk add --no-cache ca-certificates && \
      apk add --no-cache --virtual .build-deps git go musl-dev && \
+     echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \     
      go get -v -d github.com/minio/minio && \
      cd /go/src/github.com/minio/minio && \
-     go install -v -ldflags "-X github.com/minio/minio/cmd.Version=2017-03-16T21:50:32Z -X github.com/minio/minio/cmd.ReleaseTag=RELEASE.2017-03-16T21-50-32Z -X github.com/minio/minio/cmd.CommitID=5311eb22fd681a8cd4a46e2a872d46c2352c64e8" && \
+     go install -v -ldflags "$(go run buildscripts/gen-ldflags.go)" && \
      rm -rf /go/pkg /go/src /usr/local/go && apk del .build-deps
 
 EXPOSE 9000

Dockerfile.armhf

@@ -1,5 +1,7 @@
 FROM resin/armhf-alpine:3.5
 
+MAINTAINER Minio Inc <dev@minio.io>
+
 ENV GOPATH /go
 ENV PATH $PATH:$GOPATH/bin
 ENV CGO_ENABLED 0
@@ -9,9 +11,10 @@ WORKDIR /go/src/github.com/minio/
 RUN  \
      apk add --no-cache ca-certificates && \
      apk add --no-cache --virtual .build-deps git go musl-dev && \
+     echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
      go get -v -d github.com/minio/minio && \
      cd /go/src/github.com/minio/minio && \
-     go install -v -ldflags "-X github.com/minio/minio/cmd.Version=2017-03-16T21:50:32Z -X github.com/minio/minio/cmd.ReleaseTag=RELEASE.2017-03-16T21-50-32Z -X github.com/minio/minio/cmd.CommitID=5311eb22fd681a8cd4a46e2a872d46c2352c64e8" && \
+     go install -v -ldflags "$(go run buildscripts/gen-ldflags.go)" && \
      rm -rf /go/pkg /go/src /usr/local/go && apk del .build-deps
 
 EXPOSE 9000

Dockerfile.release

@@ -0,0 +1,23 @@
+FROM alpine:3.5
+
+MAINTAINER Minio Inc <dev@minio.io>
+
+RUN \
+     apk add --no-cache ca-certificates && \
+     apk add --no-cache --virtual .build-deps curl && \
+     echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
+     curl https://dl.minio.io/server/minio/release/linux-amd64/minio > /usr/bin/minio && \
+     chmod +x /usr/bin/minio && apk del .build-deps
+
+EXPOSE 9000
+
+COPY buildscripts/docker-entrypoint.sh /usr/bin/
+
+RUN chmod +x /usr/bin/docker-entrypoint.sh
+
+ENTRYPOINT ["/usr/bin/docker-entrypoint.sh"]
+
+VOLUME ["/export"]
+
+CMD ["minio"]
+

Dockerfile.release.aarch64

@@ -0,0 +1,22 @@
+FROM resin/aarch64-alpine:3.5
+
+MAINTAINER Minio Inc <dev@minio.io>
+
+RUN \
+     apk add --no-cache ca-certificates && \
+     apk add --no-cache --virtual .build-deps curl && \
+     echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
+     curl https://dl.minio.io/server/minio/release/linux-arm64/minio > /usr/bin/minio && \
+     chmod +x /usr/bin/minio && apk del .build-deps
+
+EXPOSE 9000
+
+COPY buildscripts/docker-entrypoint.sh /usr/bin/
+
+RUN chmod +x /usr/bin/docker-entrypoint.sh
+
+ENTRYPOINT ["/usr/bin/docker-entrypoint.sh"]
+
+VOLUME ["/export"]
+
+CMD ["minio"]

Dockerfile.release.armhf

@@ -0,0 +1,22 @@
+FROM resin/armhf-alpine:3.5
+
+MAINTAINER Minio Inc <dev@minio.io>
+
+RUN \
+     apk add --no-cache ca-certificates && \
+     apk add --no-cache --virtual .build-deps curl && \
+     echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
+     curl https://dl.minio.io/server/minio/release/linux-arm/minio > /usr/bin/minio && \
+     chmod +x /usr/bin/minio && apk del .build-deps
+
+EXPOSE 9000
+
+COPY buildscripts/docker-entrypoint.sh /usr/bin/
+
+RUN chmod +x /usr/bin/docker-entrypoint.sh
+
+ENTRYPOINT ["/usr/bin/docker-entrypoint.sh"]
+
+VOLUME ["/export"]
+
+CMD ["minio"]

Makefile

@@ -1,7 +1,7 @@
 LDFLAGS := $(shell go run buildscripts/gen-ldflags.go)
 PWD := $(shell pwd)
 GOPATH := $(shell go env GOPATH)
-BUILD_LDFLAGS := '$(LDFLAGS) -s -w'
+BUILD_LDFLAGS := '$(LDFLAGS)'
 TAG := latest
 
 HOST ?= $(shell uname)
@@ -56,55 +56,43 @@ endif
 all: install
 
 checks:
-	@echo -n "Check deps: "
+	@echo "Check deps"
 	@(env bash $(PWD)/buildscripts/checkdeps.sh)
-	@echo "Done."
-	@echo -n "Checking project is in GOPATH: "
+	@echo "Checking project is in GOPATH"
 	@(env bash $(PWD)/buildscripts/checkgopath.sh)
-	@echo "Done."
 
 getdeps: checks
-	@echo -n "Installing golint: " && go get -u github.com/golang/lint/golint
-	@echo "Done."
-	@echo -n "Installing gocyclo: " && go get -u github.com/fzipp/gocyclo
-	@echo "Done."
-	@echo -n "Installing deadcode: " && go get -u github.com/remyoudompheng/go-misc/deadcode
-	@echo "Done."
-	@echo -n "Installing misspell: " && go get -u github.com/client9/misspell/cmd/misspell
-	@echo "Done."
-	@echo -n "Installing ineffassign: " && go get -u github.com/gordonklaus/ineffassign
-	@echo "Done."
+	@echo "Installing golint" && go get -u github.com/golang/lint/golint
+	@echo "Installing gocyclo" && go get -u github.com/fzipp/gocyclo
+	@echo "Installing deadcode" && go get -u github.com/remyoudompheng/go-misc/deadcode
+	@echo "Installing misspell" && go get -u github.com/client9/misspell/cmd/misspell
+	@echo "Installing ineffassign" && go get -u github.com/gordonklaus/ineffassign
 
 verifiers: vet fmt lint cyclo spelling
 
 vet:
-	@echo -n "Running $@: "
+	@echo "Running $@"
 	@go tool vet -atomic -bool -copylocks -nilfunc -printf -shadow -rangeloops -unreachable -unsafeptr -unusedresult cmd
 	@go tool vet -atomic -bool -copylocks -nilfunc -printf -shadow -rangeloops -unreachable -unsafeptr -unusedresult pkg
-	@echo "Done."
 
 fmt:
-	@echo -n "Running $@: "
-	@gofmt -s -l cmd
-	@gofmt -s -l pkg
-	@echo "Done."
+	@echo "Running $@"
+	@gofmt -d cmd
+	@gofmt -d pkg
 
 lint:
-	@echo -n "Running $@: "
+	@echo "Running $@"
 	@${GOPATH}/bin/golint -set_exit_status github.com/minio/minio/cmd...
 	@${GOPATH}/bin/golint -set_exit_status github.com/minio/minio/pkg...
-	@echo "Done."
 
 ineffassign:
-	@echo -n "Running $@: "
+	@echo "Running $@"
 	@${GOPATH}/bin/ineffassign .
-	@echo "Done."
 
 cyclo:
-	@echo -n "Running $@: "
+	@echo "Running $@"
 	@${GOPATH}/bin/gocyclo -over 100 cmd
 	@${GOPATH}/bin/gocyclo -over 100 pkg
-	@echo "Done."
 
 build: getdeps verifiers $(UI_ASSETS)
 
@@ -117,30 +105,30 @@ spelling:
 	@${GOPATH}/bin/misspell -error `find docs/`
 
 test: build
-	@echo -n "Running all minio testing: "
+	@echo "Running all minio testing"
 	@go test $(GOFLAGS) .
 	@go test $(GOFLAGS) github.com/minio/minio/cmd...
 	@go test $(GOFLAGS) github.com/minio/minio/pkg...
-	@echo "Done."
 
 coverage: build
-	@echo -n "Running all coverage for minio: "
+	@echo "Running all coverage for minio"
 	@./buildscripts/go-coverage.sh
-	@echo "Done."
 
 gomake-all: build
-	@echo -n "Installing minio at $(GOPATH)/bin/minio: "
+	@echo "Installing minio at $(GOPATH)/bin/minio"
 	@go build --ldflags $(BUILD_LDFLAGS) -o $(GOPATH)/bin/minio
-	@echo "Done."
 
 pkg-add:
-	${GOPATH}/bin/govendor add $(PKG)
+	@echo "Adding new package $(PKG)"
+	@${GOPATH}/bin/govendor add $(PKG)
 
 pkg-update:
-	${GOPATH}/bin/govendor update $(PKG)
+	@echo "Updating new package $(PKG)"
+	@${GOPATH}/bin/govendor update $(PKG)
 
 pkg-remove:
-	${GOPATH}/bin/govendor remove $(PKG)
+	@echo "Remove new package $(PKG)"
+	@${GOPATH}/bin/govendor remove $(PKG)
 
 pkg-list:
 	@$(GOPATH)/bin/govendor list
@@ -154,8 +142,7 @@ experimental: verifiers
 	@MINIO_RELEASE=EXPERIMENTAL ./buildscripts/build.sh
 
 clean:
-	@echo -n "Cleaning up all the generated files: "
+	@echo "Cleaning up all the generated files"
 	@find . -name '*.test' | xargs rm -fv
 	@rm -rf build
 	@rm -rf release
-	@echo "Done."

README.md

@@ -26,7 +26,20 @@ Install minio packages using [Homebrew](http://brew.sh/)
 brew install minio/stable/minio
 minio server ~/Photos
 ```
-Note: If you are upgrading minio on macOS, please see instructions [here](https://github.com/minio/minio/blob/master/docs/minio_homebrew.md).
+#### Note
+If you previously installed minio using `brew install minio` then uninstall minio as shown below 
+
+```
+brew uninstall minio 
+```
+
+Then re-install the latest minio using:
+
+```
+brew install minio/stable/minio
+```  
+
+>`brew install minio` and `brew upgrade minio` will no longer install/upgrade the latest minio binaries on macOS. Upstream bugs in golang 1.8 broke Minio brew installer. Use the updated `minio/stable/minio` in your brew paths.
 
 ### Binary Download
 | Platform| Architecture | URL|

appveyor.yml

@@ -36,9 +36,9 @@ test_script:
   # Unit tests
   - ps: Add-AppveyorTest "Unit Tests" -Outcome Running
   - mkdir build\coverage
-  - go test -timeout 17m -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
+  - go test -v -timeout 17m -race github.com/minio/minio/cmd...
+  - go test -v -race github.com/minio/minio/pkg...
+  - go test -v -coverprofile=build\coverage\coverage.txt -covermode=atomic github.com/minio/minio/cmd
   - ps: Update-AppveyorTest "Unit Tests" -Outcome Passed
 
 after_test:

browser/README.md

@@ -27,7 +27,7 @@ go get github.com/elazarl/go-bindata-assetfs/...
 yarn release
 ```
 
-This generates ui-assets.go in the current direcotry. Now do `make` in the parent directory to build the minio binary with the newly generated ``ui-assets.go``
+This generates ui-assets.go in the current directory. Now do `make` in the parent directory to build the minio binary with the newly generated ``ui-assets.go``
 
 ### Run Minio Browser with live reload
 

browser/app/js/actions.js

@@ -432,6 +432,8 @@ export const setLoginError = () => {
 
 export const downloadSelected = (url, req, xhr) => {
   return (dispatch) => {
+    var anchor = document.createElement('a')
+    document.body.appendChild(anchor);
     xhr.open('POST', url, true)
     xhr.responseType = 'blob'
 
@@ -439,10 +441,20 @@ export const downloadSelected = (url, req, xhr) => {
       if (this.status == 200) {
         dispatch(checkedObjectsReset())
         var blob = new Blob([this.response], {
-          type: 'application/zip'
+          type: 'octet/stream'
         })
         var blobUrl = window.URL.createObjectURL(blob);
-        window.location = blobUrl
+        var separator = req.prefix.length > 1 ? '-' : ''
+
+        anchor.href = blobUrl
+        anchor.download = req.bucketName+separator+req.prefix.slice(0, -1)+'.zip';
+
+
+
+
+        anchor.click()
+        window.URL.revokeObjectURL(blobUrl)
+        anchor.remove()
       }
     };
     xhr.send(JSON.stringify(req));

browser/app/js/components/Browse.js

@@ -68,7 +68,7 @@ export default class Browse extends React.Component {
           memory: res.MinioMemory,
           platform: res.MinioPlatform,
           runtime: res.MinioRuntime,
-          envVars: res.MinioEnvVars
+          info: res.MinioGlobalInfo
         })
         dispatch(actions.setServerInfo(serverInfo))
       })
@@ -463,21 +463,25 @@ export default class Browse extends React.Component {
     }
 
     if (web.LoggedIn()) {
-      storageUsageDetails = <div className="feh-usage">
-                              <div className="fehu-chart">
-                                <div style={ { width: usedPercent } }></div>
-                              </div>
-                              <ul>
-                                <li>
-                                  <span>Used: </span>
-                                  { humanize.filesize(total - free) }
-                                </li>
-                                <li className="pull-right">
-                                  <span>Free: </span>
-                                  { humanize.filesize(total - used) }
-                                </li>
-                              </ul>
-                            </div>
+      if (!(used === 0 && free === 0)) {
+        storageUsageDetails = <div className="feh-usage">
+          <div className="fehu-chart">
+            <div style={ { width: usedPercent } }></div>
+          </div>
+          <ul>
+            <li>
+              <span>Used: </span>
+              { humanize.filesize(total - free) }
+            </li>
+            <li className="pull-right">
+              <span>Free: </span>
+              { humanize.filesize(total - used) }
+            </li>
+          </ul>
+        </div>
+      }
+
+
     }
 
     let createButton = ''
@@ -722,11 +726,11 @@ export default class Browse extends React.Component {
                 </div>
                 <div className="input-group" style={ { display: web.LoggedIn() ? 'block' : 'none' } }>
                   <label>
-                    Expires in
+                    Expires in (Max 7 days)
                   </label>
                   <div className="set-expire">
                     <div className="set-expire-item">
-                      <i className="set-expire-increase" onClick={ this.handleExpireValue.bind(this, 'expireDays', 1, shareObject.object) }></i>
+                      <i className="set-expire-increase" onClick={ this.handleExpireValue.bind(this, 'expireDays', 1, shareObject.object) } />
                       <div className="set-expire-title">
                         Days
                       </div>
@@ -735,12 +739,14 @@ export default class Browse extends React.Component {
                           type="number"
                           min={ 0 }
                           max={ 7 }
-                          defaultValue={ 5 } />
+                          defaultValue={ 5 }
+                          readOnly="readOnly"
+                        />
                       </div>
-                      <i className="set-expire-decrease" onClick={ this.handleExpireValue.bind(this, 'expireDays', -1, shareObject.object) }></i>
+                      <i className="set-expire-decrease" onClick={ this.handleExpireValue.bind(this, 'expireDays', -1, shareObject.object) } />
                     </div>
                     <div className="set-expire-item">
-                      <i className="set-expire-increase" onClick={ this.handleExpireValue.bind(this, 'expireHours', 1, shareObject.object) }></i>
+                      <i className="set-expire-increase" onClick={ this.handleExpireValue.bind(this, 'expireHours', 1, shareObject.object) } />
                       <div className="set-expire-title">
                         Hours
                       </div>
@@ -749,12 +755,14 @@ export default class Browse extends React.Component {
                           type="number"
                           min={ 0 }
                           max={ 23 }
-                          defaultValue={ 0 } />
+                          defaultValue={ 0 }
+                          readOnly="readOnly"
+                        />
                       </div>
-                      <i className="set-expire-decrease" onClick={ this.handleExpireValue.bind(this, 'expireHours', -1, shareObject.object) }></i>
+                      <i className="set-expire-decrease" onClick={ this.handleExpireValue.bind(this, 'expireHours', -1, shareObject.object) } />
                     </div>
                     <div className="set-expire-item">
-                      <i className="set-expire-increase" onClick={ this.handleExpireValue.bind(this, 'expireMins', 1, shareObject.object) }></i>
+                      <i className="set-expire-increase" onClick={ this.handleExpireValue.bind(this, 'expireMins', 1, shareObject.object) } />
                       <div className="set-expire-title">
                         Minutes
                       </div>
@@ -763,9 +771,11 @@ export default class Browse extends React.Component {
                           type="number"
                           min={ 0 }
                           max={ 59 }
-                          defaultValue={ 0 } />
+                          defaultValue={ 0 }
+                          readOnly="readOnly"
+                        />
                       </div>
-                      <i className="set-expire-decrease" onClick={ this.handleExpireValue.bind(this, 'expireMins', -1, shareObject.object) }></i>
+                      <i className="set-expire-decrease" onClick={ this.handleExpireValue.bind(this, 'expireMins', -1, shareObject.object) } />
                     </div>
                   </div>
                 </div>

browser/app/js/components/PolicyInput.js

@@ -7,6 +7,7 @@ import * as actions from '../actions'
 class PolicyInput extends Component {
   componentDidMount() {
     const {web, dispatch} = this.props
+    this.prefix.focus()
     web.ListAllBucketPolicies({
       bucketName: this.props.currentBucket
     }).then(res => {
@@ -27,8 +28,23 @@ class PolicyInput extends Component {
 
   handlePolicySubmit(e) {
     e.preventDefault()
-    const {web, dispatch} = this.props
+    const {web, dispatch, currentBucket} = this.props
 
+    let prefix = currentBucket + '/' + this.prefix.value
+    let policy = this.policy.value
+
+    if (!prefix.endsWith('*')) prefix = prefix + '*'
+ 
+    let prefixAlreadyExists = this.props.policies.some(elem => prefix === elem.prefix)
+
+    if (prefixAlreadyExists) {
+      dispatch(actions.showAlert({
+       type: 'danger',
+       message: "Policy for this prefix already exists."
+      }))
+      return
+    }
+    
     web.SetBucketPolicy({
       bucketName: this.props.currentBucket,
       prefix: this.prefix.value,
@@ -36,8 +52,7 @@ class PolicyInput extends Component {
     })
       .then(() => {
         dispatch(actions.setPolicies([{
-          policy: this.policy.value,
-          prefix: this.prefix.value + '*',
+          policy, prefix
         }, ...this.props.policies]))
         this.prefix.value = ''
       })

browser/app/js/components/SettingsModal.js

@@ -34,23 +34,12 @@ class SettingsModal extends React.Component {
 
     let accessKeyEnv = ''
     let secretKeyEnv = ''
-    // Check environment variables first. They may or may not have been
-    // loaded already; they load in Browse#componentDidMount.
-    if (serverInfo.envVars) {
-      serverInfo.envVars.forEach(envVar => {
-        let keyVal = envVar.split('=')
-        if (keyVal[0] == 'MINIO_ACCESS_KEY') {
-          accessKeyEnv = keyVal[1]
-        } else if (keyVal[0] == 'MINIO_SECRET_KEY') {
-          secretKeyEnv = keyVal[1]
-        }
-      })
-    }
-    if (accessKeyEnv != '' || secretKeyEnv != '') {
+    // Check environment variables first.
+    if (serverInfo.info.isEnvCreds) {
       dispatch(actions.setSettings({
-        accessKey: accessKeyEnv,
-        secretKey: secretKeyEnv,
-        keysReadOnly: true
+          accessKey: 'xxxxxxxxx',
+          secretKey: 'xxxxxxxxx',
+          keysReadOnly: true
       }))
     } else {
       web.GetAuth()

browser/app/less/inc/form.less

@@ -183,6 +183,17 @@ select.form-control {
 .set-expire {
     border: 1px solid @input-border;
     margin: 35px 0 30px;
+    position: relative;
+
+    &:before {
+        content: '';
+        position: absolute;
+        left: 0;
+        top: 0;
+        width: 100%;
+        height: 100%;
+        z-index: 1;
+    }
 }
 
 .set-expire-item {
@@ -191,6 +202,7 @@ select.form-control {
     display: table-cell;
     width: 1%;
     text-align: center;
+    .user-select(none);
 
     &:not(:last-child) {
         border-right: 1px solid @input-border;
@@ -209,6 +221,7 @@ select.form-control {
     left: -8px;
 
     input {
+        .user-select(none);
         font-size: 20px;
         text-align: center;
         position: relative;

buildscripts/build.sh

@@ -5,7 +5,7 @@ _init() {
     LDFLAGS=$(go run buildscripts/gen-ldflags.go)
 
     # Extract release tag
-    release_tag=$(echo $LDFLAGS | awk {'print $4'} | cut -f2 -d=)
+    release_tag=$(echo $LDFLAGS | awk {'print $6'} | cut -f2 -d=)
 
     # Verify release tag.
     if [ -z "$release_tag" ]; then
@@ -28,6 +28,7 @@ _init() {
     ## System binaries
     CP=`which cp`
     SHASUM=`which shasum`
+    SHA256SUM="${SHASUM} -a 256"
     SED=`which sed`
 }
 
@@ -43,58 +44,36 @@ go_build() {
     release_bin="$release_str/$os-$arch/$(basename $package).$release_tag"
     # Release binary downloadable name
     release_real_bin="$release_str/$os-$arch/$(basename $package)"
-    # Release shasum name
-    release_shasum="$release_str/$os-$arch/$(basename $package).shasum"
+
+    # Release sha1sum name
+    release_shasum="$release_str/$os-$arch/$(basename $package).${release_tag}.shasum"
+    # Release sha1sum default
+    release_shasum_default="$release_str/$os-$arch/$(basename $package).shasum"
+
+    # Release sha256sum name
+    release_sha256sum="$release_str/$os-$arch/$(basename $package).${release_tag}.sha256sum"
+    # Release sha256sum default
+    release_sha256sum_default="$release_str/$os-$arch/$(basename $package).sha256sum"
 
     # Go build to build the binary.
-    if [ "${arch}" == "arm" ]; then
-        # Release binary downloadable name
-        release_real_bin_6="$release_str/$os-${arch}6vl/$(basename $package)"
+    CGO_ENABLED=0 GOOS=$os GOARCH=$arch go build --ldflags "${LDFLAGS}" -o $release_bin
 
-        release_bin_6="$release_str/$os-${arch}6vl/$(basename $package).$release_tag"
-        ## Support building for ARM6vl
-        GOARM=6 GOOS=$os GOARCH=$arch go build --ldflags "-s -w ${LDFLAGS}" -o $release_bin_6
-
-        ## Copy
-        $CP -p $release_bin_6 $release_real_bin_6
-
-        # Release shasum name
-        release_shasum_6="$release_str/$os-${arch}6vl/$(basename $package).shasum"
-
-        # Calculate shasum
-        shasum_str=$(${SHASUM} ${release_bin_6})
-        echo ${shasum_str} | $SED "s/$release_str\/$os-${arch}6vl\///g" > $release_shasum_6
-
-        # Release binary downloadable name
-        release_real_bin_7="$release_str/$os-$arch/$(basename $package)"
-
-        release_bin_7="$release_str/$os-$arch/$(basename $package).$release_tag"
-        ## Support building for ARM7vl
-        GOARM=7 GOOS=$os GOARCH=$arch go build --ldflags "-s -w ${LDFLAGS}" -o $release_bin_7
-
-        ## Copy
-        $CP -p $release_bin_7 $release_real_bin_7
-
-        # Release shasum name
-        release_shasum_7="$release_str/$os-$arch/$(basename $package).shasum"
-
-        # Calculate shasum
-        shasum_str=$(${SHASUM} ${release_bin_7})
-        echo ${shasum_str} | $SED "s/$release_str\/$os-$arch\///g" > $release_shasum_7
+    # Create copy
+    if [ $os == "windows" ]; then
+        $CP -p $release_bin ${release_real_bin}.exe
     else
-        GOOS=$os GOARCH=$arch go build --ldflags "-s -w ${LDFLAGS}" -o $release_bin
-
-        # Create copy
-        if [ $os == "windows" ]; then
-            $CP -p $release_bin ${release_real_bin}.exe
-        else
-            $CP -p $release_bin $release_real_bin
-        fi
-
-        # Calculate shasum
-        shasum_str=$(${SHASUM} ${release_bin})
-        echo ${shasum_str} | $SED "s/$release_str\/$os-$arch\///g" > $release_shasum
+        $CP -p $release_bin $release_real_bin
     fi
+
+    # Calculate sha1sum
+    shasum_str=$(${SHASUM} ${release_bin})
+    echo ${shasum_str} | $SED "s/$release_str\/$os-$arch\///g" > $release_shasum
+    $CP -p $release_shasum $release_shasum_default
+
+    # Calculate sha256sum
+    sha256sum_str=$(${SHA256SUM} ${release_bin})
+    echo ${sha256sum_str} | $SED "s/$release_str\/$os-$arch\///g" > $release_sha256sum
+    $CP -p $release_sha256sum $release_sha256sum_default
 }
 
 main() {

cmd/admin-handlers.go

@@ -241,9 +241,9 @@ type ServerInfoData struct {
 
 // ServerInfo holds server information result of one node
 type ServerInfo struct {
-	Error error
-	Addr  string
-	Data  *ServerInfoData
+	Error string          `json:"error"`
+	Addr  string          `json:"addr"`
+	Data  *ServerInfoData `json:"data"`
 }
 
 // ServerInfoHandler - GET /?info
@@ -276,7 +276,7 @@ func (adminAPI adminAPIHandlers) ServerInfoHandler(w http.ResponseWriter, r *htt
 			serverInfoData, err := peer.cmdRunner.ServerInfoData()
 			if err != nil {
 				errorIf(err, "Unable to get server info from %s.", peer.addr)
-				reply[idx].Error = err
+				reply[idx].Error = err.Error()
 				return
 			}
 

cmd/admin-handlers_test.go

@@ -731,7 +731,7 @@ func TestListObjectsHealHandler(t *testing.T) {
 	}
 	defer adminTestBed.TearDown()
 
-	err = adminTestBed.objLayer.MakeBucket("mybucket")
+	err = adminTestBed.objLayer.MakeBucketWithLocation("mybucket", "")
 	if err != nil {
 		t.Fatalf("Failed to make bucket - %v", err)
 	}
@@ -859,7 +859,7 @@ func TestHealBucketHandler(t *testing.T) {
 	}
 	defer adminTestBed.TearDown()
 
-	err = adminTestBed.objLayer.MakeBucket("mybucket")
+	err = adminTestBed.objLayer.MakeBucketWithLocation("mybucket", "")
 	if err != nil {
 		t.Fatalf("Failed to make bucket - %v", err)
 	}
@@ -936,7 +936,7 @@ func TestHealObjectHandler(t *testing.T) {
 	// Create an object myobject under bucket mybucket.
 	bucketName := "mybucket"
 	objName := "myobject"
-	err = adminTestBed.objLayer.MakeBucket(bucketName)
+	err = adminTestBed.objLayer.MakeBucketWithLocation(bucketName, "")
 	if err != nil {
 		t.Fatalf("Failed to make bucket %s - %v", bucketName, err)
 	}
@@ -1067,7 +1067,7 @@ func TestHealUploadHandler(t *testing.T) {
 	// Create an object myobject under bucket mybucket.
 	bucketName := "mybucket"
 	objName := "myobject"
-	err = adminTestBed.objLayer.MakeBucket(bucketName)
+	err = adminTestBed.objLayer.MakeBucketWithLocation(bucketName, "")
 	if err != nil {
 		t.Fatalf("Failed to make bucket %s - %v", bucketName, err)
 	}
@@ -1314,7 +1314,7 @@ func TestAdminServerInfo(t *testing.T) {
 		if len(serverInfo.Addr) == 0 {
 			t.Error("Expected server address to be non empty")
 		}
-		if serverInfo.Error != nil {
+		if serverInfo.Error != "" {
 			t.Errorf("Unexpected error = %v\n", serverInfo.Error)
 		}
 		if serverInfo.Data.StorageInfo.Free == 0 {
@@ -1455,7 +1455,7 @@ func TestListHealUploadsHandler(t *testing.T) {
 	}
 	defer adminTestBed.TearDown()
 
-	err = adminTestBed.objLayer.MakeBucket("mybucket")
+	err = adminTestBed.objLayer.MakeBucketWithLocation("mybucket", "")
 	if err != nil {
 		t.Fatalf("Failed to make bucket - %v", err)
 	}

cmd/api-errors.go

@@ -149,6 +149,7 @@ const (
 	ErrAdminInvalidAccessKey
 	ErrAdminInvalidSecretKey
 	ErrAdminConfigNoQuorum
+	ErrInsecureClientRequest
 )
 
 // error code to APIError structure, these fields carry respective
@@ -230,7 +231,7 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		HTTPStatusCode: http.StatusInternalServerError,
 	},
 	ErrInvalidAccessKeyID: {
-		Code:           "InvalidAccessKeyID",
+		Code:           "InvalidAccessKeyId",
 		Description:    "The access key ID you provided does not exist in our records.",
 		HTTPStatusCode: http.StatusForbidden,
 	},
@@ -618,6 +619,11 @@ var errorCodeResponse = map[APIErrorCode]APIError{
 		Description:    "Configuration update failed because server quorum was not met",
 		HTTPStatusCode: http.StatusServiceUnavailable,
 	},
+	ErrInsecureClientRequest: {
+		Code:           "XMinioInsecureClientRequest",
+		Description:    "Cannot respond to plain-text request from TLS-encrypted server",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 
 	// Add your error structure here.
 }

cmd/api-headers.go

@@ -62,8 +62,8 @@ func setObjectHeaders(w http.ResponseWriter, objInfo ObjectInfo, contentRange *h
 	w.Header().Set("Last-Modified", lastModified)
 
 	// Set Etag if available.
-	if objInfo.MD5Sum != "" {
-		w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
+	if objInfo.ETag != "" {
+		w.Header().Set("ETag", "\""+objInfo.ETag+"\"")
 	}
 
 	// Set all other user defined metadata.

cmd/api-response.go

@@ -321,8 +321,8 @@ func generateListObjectsV1Response(bucket, prefix, marker, delimiter string, max
 		}
 		content.Key = object.Name
 		content.LastModified = object.ModTime.UTC().Format(timeFormatAMZLong)
-		if object.MD5Sum != "" {
-			content.ETag = "\"" + object.MD5Sum + "\""
+		if object.ETag != "" {
+			content.ETag = "\"" + object.ETag + "\""
 		}
 		content.Size = object.Size
 		content.StorageClass = globalMinioDefaultStorageClass
@@ -370,8 +370,8 @@ func generateListObjectsV2Response(bucket, prefix, token, startAfter, delimiter
 		}
 		content.Key = object.Name
 		content.LastModified = object.ModTime.UTC().Format(timeFormatAMZLong)
-		if object.MD5Sum != "" {
-			content.ETag = "\"" + object.MD5Sum + "\""
+		if object.ETag != "" {
+			content.ETag = "\"" + object.ETag + "\""
 		}
 		content.Size = object.Size
 		content.StorageClass = globalMinioDefaultStorageClass

cmd/auth-handler.go

@@ -113,13 +113,13 @@ func checkRequestAuthType(r *http.Request, bucket, policyAction, region string)
 		// Signature V2 validation.
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 		}
 		return s3Error
 	case authTypeSigned, authTypePresigned:
 		s3Error := isReqAuthenticated(r, region)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 		}
 		return s3Error
 	}

cmd/auth-rpc-client.go

@@ -52,10 +52,10 @@ type authConfig struct {
 
 // AuthRPCClient is a authenticated RPC client which does authentication before doing Call().
 type AuthRPCClient struct {
-	sync.Mutex            // Mutex to lock this object.
-	rpcClient  *RPCClient // Reconnectable RPC client to make any RPC call.
-	config     authConfig // Authentication configuration information.
-	authToken  string     // Authentication token.
+	sync.RWMutex            // Mutex to lock this object.
+	rpcClient    *RPCClient // Reconnectable RPC client to make any RPC call.
+	config       authConfig // Authentication configuration information.
+	authToken    string     // Authentication token.
 }
 
 // newAuthRPCClient - returns a JWT based authenticated (go) rpc client, which does automatic reconnect.
@@ -78,33 +78,43 @@ func newAuthRPCClient(config authConfig) *AuthRPCClient {
 	}
 }
 
-// Login - a jwt based authentication is performed with rpc server.
+// Login a JWT based authentication is performed with rpc server.
 func (authClient *AuthRPCClient) Login() (err error) {
+	// Login should be attempted one at a time.
+	//
+	// The reason for large region lock here is
+	// to avoid two simultaneous login attempts
+	// racing over each other.
+	//
+	// #1 Login() gets the lock proceeds to login.
+	// #2 Login() waits for the unlock to happen
+	//    after login in #1.
+	// #1 Successfully completes login saves the
+	//    newly acquired token.
+	// #2 Successfully gets the lock and proceeds,
+	//    but since we have acquired the token
+	//    already the call quickly returns.
 	authClient.Lock()
 	defer authClient.Unlock()
 
-	// Return if already logged in.
-	if authClient.authToken != "" {
-		return nil
+	// Attempt to login if not logged in already.
+	if authClient.authToken == "" {
+		// Login to authenticate and acquire a new auth token.
+		var (
+			loginMethod = authClient.config.serviceName + loginMethodName
+			loginArgs   = LoginRPCArgs{
+				Username:    authClient.config.accessKey,
+				Password:    authClient.config.secretKey,
+				Version:     Version,
+				RequestTime: UTCNow(),
+			}
+			loginReply = LoginRPCReply{}
+		)
+		if err = authClient.rpcClient.Call(loginMethod, &loginArgs, &loginReply); err != nil {
+			return err
+		}
+		authClient.authToken = loginReply.AuthToken
 	}
-
-	// Call login.
-	args := LoginRPCArgs{
-		Username:    authClient.config.accessKey,
-		Password:    authClient.config.secretKey,
-		Version:     Version,
-		RequestTime: UTCNow(),
-	}
-
-	reply := LoginRPCReply{}
-	serviceMethod := authClient.config.serviceName + loginMethodName
-	if err = authClient.rpcClient.Call(serviceMethod, &args, &reply); err != nil {
-		return err
-	}
-
-	// Logged in successfully.
-	authClient.authToken = reply.AuthToken
-
 	return nil
 }
 
@@ -112,17 +122,17 @@ func (authClient *AuthRPCClient) Login() (err error) {
 func (authClient *AuthRPCClient) call(serviceMethod string, args interface {
 	SetAuthToken(authToken string)
 }, reply interface{}) (err error) {
-	// On successful login, execute RPC call.
-	if err = authClient.Login(); err == nil {
-		authClient.Lock()
-		// Set token and timestamp before the rpc call.
-		args.SetAuthToken(authClient.authToken)
-		authClient.Unlock()
+	if err = authClient.Login(); err != nil {
+		return err
+	} // On successful login, execute RPC call.
 
-		// Do RPC call.
-		err = authClient.rpcClient.Call(serviceMethod, args, reply)
-	}
-	return err
+	authClient.RLock()
+	// Set token before the rpc call.
+	args.SetAuthToken(authClient.authToken)
+	authClient.RUnlock()
+
+	// Do an RPC call.
+	return authClient.rpcClient.Call(serviceMethod, args, reply)
 }
 
 // Call executes RPC call till success or globalAuthRPCRetryThreshold on ErrShutdown.

cmd/benchmark-utils_test.go

@@ -39,7 +39,7 @@ func runPutObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
 	// obtains random bucket name.
 	bucket := getRandomBucketName()
 	// create bucket.
-	err = obj.MakeBucket(bucket)
+	err = obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -49,7 +49,7 @@ func runPutObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
 	// generate md5sum for the generated data.
 	// md5sum of the data to written is required as input for PutObject.
 	metadata := make(map[string]string)
-	metadata["md5Sum"] = getMD5Hash(textData)
+	metadata["etag"] = getMD5Hash(textData)
 	sha256sum := ""
 	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
 	b.ReportAllocs()
@@ -61,8 +61,8 @@ func runPutObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
 		if err != nil {
 			b.Fatal(err)
 		}
-		if objInfo.MD5Sum != metadata["md5Sum"] {
-			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, objInfo.MD5Sum, metadata["md5Sum"])
+		if objInfo.ETag != metadata["etag"] {
+			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, objInfo.ETag, metadata["etag"])
 		}
 	}
 	// Benchmark ends here. Stop timer.
@@ -78,22 +78,22 @@ func runPutObjectPartBenchmark(b *testing.B, obj ObjectLayer, partSize int) {
 	object := getRandomObjectName()
 
 	// create bucket.
-	err = obj.MakeBucket(bucket)
+	err = obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}
 
 	objSize := 128 * humanize.MiByte
 
-	// PutObjectPart returns md5Sum of the object inserted.
-	// md5Sum variable is assigned with that value.
-	var md5Sum, uploadID string
+	// PutObjectPart returns etag of the object inserted.
+	// etag variable is assigned with that value.
+	var etag, 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.
 	metadata := make(map[string]string)
-	metadata["md5Sum"] = getMD5Hash(textData)
+	metadata["etag"] = getMD5Hash(textData)
 	sha256sum := ""
 	uploadID, err = obj.NewMultipartUpload(bucket, object, metadata)
 	if err != nil {
@@ -115,14 +115,14 @@ func runPutObjectPartBenchmark(b *testing.B, obj ObjectLayer, partSize int) {
 				textPartData = textData[j*partSize:]
 			}
 			metadata := make(map[string]string)
-			metadata["md5Sum"] = getMD5Hash([]byte(textPartData))
+			metadata["etag"] = getMD5Hash([]byte(textPartData))
 			var partInfo PartInfo
-			partInfo, err = obj.PutObjectPart(bucket, object, uploadID, j, int64(len(textPartData)), bytes.NewBuffer(textPartData), metadata["md5Sum"], sha256sum)
+			partInfo, err = obj.PutObjectPart(bucket, object, uploadID, j, int64(len(textPartData)), bytes.NewBuffer(textPartData), metadata["etag"], sha256sum)
 			if err != nil {
 				b.Fatal(err)
 			}
-			if partInfo.ETag != metadata["md5Sum"] {
-				b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, md5Sum, metadata["md5Sum"])
+			if partInfo.ETag != metadata["etag"] {
+				b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, etag, metadata["etag"])
 			}
 		}
 	}
@@ -199,7 +199,7 @@ func runGetObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
 	// obtains random bucket name.
 	bucket := getRandomBucketName()
 	// create bucket.
-	err = obj.MakeBucket(bucket)
+	err = obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -208,19 +208,19 @@ func runGetObjectBenchmark(b *testing.B, obj ObjectLayer, objSize int) {
 	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.
+		// generate etag for the generated data.
+		// etag of the data to written is required as input for PutObject.
 		// PutObject is the functions which writes the data onto the FS/XL backend.
 		metadata := make(map[string]string)
-		metadata["md5Sum"] = getMD5Hash(textData)
+		metadata["etag"] = getMD5Hash(textData)
 		// insert the object.
 		var objInfo ObjectInfo
 		objInfo, err = obj.PutObject(bucket, "object"+strconv.Itoa(i), int64(len(textData)), bytes.NewBuffer(textData), metadata, sha256sum)
 		if err != nil {
 			b.Fatal(err)
 		}
-		if objInfo.MD5Sum != metadata["md5Sum"] {
-			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, objInfo.MD5Sum, metadata["md5Sum"])
+		if objInfo.ETag != metadata["etag"] {
+			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, objInfo.ETag, metadata["etag"])
 		}
 	}
 
@@ -307,7 +307,7 @@ func runPutObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
 	// obtains random bucket name.
 	bucket := getRandomBucketName()
 	// create bucket.
-	err = obj.MakeBucket(bucket)
+	err = obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -317,7 +317,7 @@ func runPutObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
 	// generate md5sum for the generated data.
 	// md5sum of the data to written is required as input for PutObject.
 	metadata := make(map[string]string)
-	metadata["md5Sum"] = getMD5Hash([]byte(textData))
+	metadata["etag"] = getMD5Hash([]byte(textData))
 	sha256sum := ""
 	// benchmark utility which helps obtain number of allocations and bytes allocated per ops.
 	b.ReportAllocs()
@@ -332,8 +332,8 @@ func runPutObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
 			if err != nil {
 				b.Fatal(err)
 			}
-			if objInfo.MD5Sum != metadata["md5Sum"] {
-				b.Fatalf("Write no: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", objInfo.MD5Sum, metadata["md5Sum"])
+			if objInfo.ETag != metadata["etag"] {
+				b.Fatalf("Write no: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", objInfo.ETag, metadata["etag"])
 			}
 			i++
 		}
@@ -355,7 +355,7 @@ func runGetObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
 	// obtains random bucket name.
 	bucket := getRandomBucketName()
 	// create bucket.
-	err = obj.MakeBucket(bucket)
+	err = obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -367,7 +367,7 @@ func runGetObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
 		// 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.
 		metadata := make(map[string]string)
-		metadata["md5Sum"] = getMD5Hash([]byte(textData))
+		metadata["etag"] = getMD5Hash([]byte(textData))
 		sha256sum := ""
 		// insert the object.
 		var objInfo ObjectInfo
@@ -375,8 +375,8 @@ func runGetObjectBenchmarkParallel(b *testing.B, obj ObjectLayer, objSize int) {
 		if err != nil {
 			b.Fatal(err)
 		}
-		if objInfo.MD5Sum != metadata["md5Sum"] {
-			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, objInfo.MD5Sum, metadata["md5Sum"])
+		if objInfo.ETag != metadata["etag"] {
+			b.Fatalf("Write no: %d: Md5Sum mismatch during object write into the bucket: Expected %s, got %s", i+1, objInfo.ETag, metadata["etag"])
 		}
 	}
 

cmd/bucket-handlers.go

@@ -83,6 +83,10 @@ func enforceBucketPolicy(bucket, action, resource, referer string, queryParams u
 
 // Check if the action is allowed on the bucket/prefix.
 func isBucketActionAllowed(action, bucket, prefix string) bool {
+	if globalBucketPolicies == nil {
+		return false
+	}
+
 	policy := globalBucketPolicies.GetBucketPolicy(bucket)
 	if policy == nil {
 		return false
@@ -389,7 +393,7 @@ func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Req
 	defer bucketLock.Unlock()
 
 	// Proceed to creating a bucket.
-	err := objectAPI.MakeBucket(bucket)
+	err := objectAPI.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		errorIf(err, "Unable to create a bucket.")
 		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
@@ -535,7 +539,7 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 		return
 	}
 
-	w.Header().Set("ETag", `"`+objInfo.MD5Sum+`"`)
+	w.Header().Set("ETag", `"`+objInfo.ETag+`"`)
 	w.Header().Set("Location", getObjectLocation(bucket, object))
 
 	// Get host and port from Request.RemoteAddr.
@@ -568,7 +572,7 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 		resp := encodeResponse(PostResponse{
 			Bucket:   objInfo.Bucket,
 			Key:      objInfo.Name,
-			ETag:     `"` + objInfo.MD5Sum + `"`,
+			ETag:     `"` + objInfo.ETag + `"`,
 			Location: getObjectLocation(objInfo.Bucket, objInfo.Name),
 		})
 		writeResponse(w, http.StatusCreated, resp, "application/xml")

cmd/bucket-handlers_test.go

@@ -68,7 +68,7 @@ func testGetBucketLocationHandler(obj ObjectLayer, instanceType, bucketName stri
 			locationResponse:   []byte(""),
 			errorResponse: APIErrorResponse{
 				Resource: "/" + bucketName + "/",
-				Code:     "InvalidAccessKeyID",
+				Code:     "InvalidAccessKeyId",
 				Message:  "The access key ID you provided does not exist in our records.",
 			},
 			shouldPass: false,
@@ -771,3 +771,36 @@ func testAPIDeleteMultipleObjectsHandler(obj ObjectLayer, instanceType, bucketNa
 	// `ExecObjectLayerAPINilTest` manages the operation.
 	ExecObjectLayerAPINilTest(t, nilBucket, nilObject, instanceType, apiRouter, nilReq)
 }
+
+func TestIsBucketActionAllowed(t *testing.T) {
+	ExecObjectLayerAPITest(t, testIsBucketActionAllowedHandler, []string{"BucketLocation"})
+}
+
+func testIsBucketActionAllowedHandler(obj ObjectLayer, instanceType, bucketName string, apiRouter http.Handler,
+	credentials credential, t *testing.T) {
+
+	testCases := []struct {
+		// input.
+		action              string
+		bucket              string
+		prefix              string
+		isGlobalPoliciesNil bool
+		// flag indicating whether the test should pass.
+		shouldPass bool
+	}{
+		{"s3:GetBucketLocation", "mybucket", "abc", true, false},
+		{"s3:ListObject", "mybucket", "abc", false, false},
+	}
+	for i, testCase := range testCases {
+		if testCase.isGlobalPoliciesNil {
+			globalBucketPolicies = nil
+		} else {
+			initBucketPolicies(obj)
+		}
+		isAllowed := isBucketActionAllowed(testCase.action, testCase.bucket, testCase.prefix)
+		if isAllowed != testCase.shouldPass {
+			t.Errorf("Case %d: Expected the response status to be `%t`, but instead found `%t`", i+1, testCase.shouldPass, isAllowed)
+		}
+
+	}
+}

cmd/bucket-notification-utils.go

@@ -17,6 +17,7 @@
 package cmd
 
 import (
+	"errors"
 	"strings"
 
 	"github.com/minio/minio-go/pkg/set"
@@ -111,20 +112,21 @@ 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.
+	strs := strings.SplitN(arn, ":", -1)
+	if len(strs) != 6 {
 		return ErrARNNotification
-	case 2:
-		// Account topic id or topic name cannot be empty.
-		if account[0] == "" || account[1] == "" {
-			return ErrARNNotification
+	}
+	if serverConfig.GetRegion() != "" {
+		region := strs[3]
+		if region != serverConfig.GetRegion() {
+			return ErrRegionNotification
 		}
 	}
+	accountID := strs[4]
+	resource := strs[5]
+	if accountID == "" || resource == "" {
+		return ErrARNNotification
+	}
 	return ErrNone
 }
 
@@ -257,29 +259,39 @@ func validateNotificationConfig(nConfig notificationConfig) APIErrorCode {
 // - kafka
 // - webhook
 func unmarshalSqsARN(queueARN string) (mSqs arnSQS) {
-	mSqs = arnSQS{}
-	if !strings.HasPrefix(queueARN, minioSqs+serverConfig.GetRegion()+":") {
-		return mSqs
+	strs := strings.SplitN(queueARN, ":", -1)
+	if len(strs) != 6 {
+		return
 	}
-	sqsType := strings.TrimPrefix(queueARN, minioSqs+serverConfig.GetRegion()+":")
-	switch {
-	case hasSuffix(sqsType, queueTypeAMQP):
+	if serverConfig.GetRegion() != "" {
+		region := strs[3]
+		if region != serverConfig.GetRegion() {
+			return
+		}
+	}
+	sqsType := strs[5]
+	switch sqsType {
+	case queueTypeAMQP:
 		mSqs.Type = queueTypeAMQP
-	case hasSuffix(sqsType, queueTypeNATS):
+	case queueTypeNATS:
 		mSqs.Type = queueTypeNATS
-	case hasSuffix(sqsType, queueTypeElastic):
+	case queueTypeElastic:
 		mSqs.Type = queueTypeElastic
-	case hasSuffix(sqsType, queueTypeRedis):
+	case queueTypeRedis:
 		mSqs.Type = queueTypeRedis
-	case hasSuffix(sqsType, queueTypePostgreSQL):
+	case queueTypePostgreSQL:
 		mSqs.Type = queueTypePostgreSQL
-	case hasSuffix(sqsType, queueTypeMySQL):
+	case queueTypeMySQL:
 		mSqs.Type = queueTypeMySQL
-	case hasSuffix(sqsType, queueTypeKafka):
+	case queueTypeKafka:
 		mSqs.Type = queueTypeKafka
-	case hasSuffix(sqsType, queueTypeWebhook):
+	case queueTypeWebhook:
 		mSqs.Type = queueTypeWebhook
+	default:
+		errorIf(errors.New("invalid SQS type"), "SQS type: %s", sqsType)
 	} // Add more queues here.
-	mSqs.AccountID = strings.TrimSuffix(sqsType, ":"+mSqs.Type)
-	return mSqs
+
+	mSqs.AccountID = strs[4]
+
+	return
 }

cmd/bucket-notification-utils_test.go

@@ -259,11 +259,6 @@ func TestQueueARN(t *testing.T) {
 			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:",
@@ -298,6 +293,37 @@ func TestQueueARN(t *testing.T) {
 			t.Errorf("Test %d: Expected \"%d\", got \"%d\"", i+1, testCase.errCode, errCode)
 		}
 	}
+
+	// Test when server region is set.
+	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
+	}{
+		// Incorrect region should produce error.
+		{
+			queueARN: "arn:minio:sqs:us-west-1:1:webhook",
+			errCode:  ErrRegionNotification,
+		},
+		// Correct region should not produce error.
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:webhook",
+			errCode:  ErrNone,
+		},
+	}
+
+	// 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 queue arn.
@@ -337,11 +363,6 @@ func TestUnmarshalSQSARN(t *testing.T) {
 			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:",
@@ -361,4 +382,33 @@ func TestUnmarshalSQSARN(t *testing.T) {
 		}
 	}
 
+	// Test when the server region is set.
+	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
+	}{
+		// Incorrect region in ARN returns empty mSqs.Type
+		{
+			queueARN: "arn:minio:sqs:us-west-1:1:webhook",
+			Type:     "",
+		},
+		// Correct regionin ARN returns valid mSqs.Type
+		{
+			queueARN: "arn:minio:sqs:us-east-1:1:webhook",
+			Type:     "webhook",
+		},
+	}
+
+	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_test.go

@@ -251,7 +251,7 @@ func testPutBucketPolicyHandler(obj ObjectLayer, instanceType, bucketName string
 	initBucketPolicies(obj)
 
 	bucketName1 := fmt.Sprintf("%s-1", bucketName)
-	if err := obj.MakeBucket(bucketName1); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName1, ""); err != nil {
 		t.Fatal(err)
 	}
 

cmd/config-migrate.go

@@ -27,77 +27,125 @@ import (
 // DO NOT EDIT following message template, please open a github issue to discuss instead.
 var configMigrateMSGTemplate = "Configuration file %s migrated from version '%s' to '%s' successfully.\n"
 
+// Migrates all config versions from "1" to "18".
 func migrateConfig() error {
-	// Purge all configs with version '1'.
+	// Purge all configs with version '1',
+	// this is a special case since version '1' used
+	// to be a filename 'fsUsers.json' not 'config.json'.
 	if err := purgeV1(); err != nil {
 		return err
 	}
-	// Migrate version '2' to '3'.
-	if err := migrateV2ToV3(); err != nil {
-		return err
-	}
-	// Migrate version '3' to '4'.
-	if err := migrateV3ToV4(); err != nil {
-		return err
-	}
-	// Migrate version '4' to '5'.
-	if err := migrateV4ToV5(); err != nil {
-		return err
-	}
-	// Migrate version '5' to '6.
-	if err := migrateV5ToV6(); err != nil {
-		return err
-	}
-	// Migrate version '6' to '7'.
-	if err := migrateV6ToV7(); err != nil {
-		return err
-	}
-	// Migrate version '7' to '8'.
-	if err := migrateV7ToV8(); err != nil {
-		return err
-	}
-	// Migrate version '8' to '9'.
-	if err := migrateV8ToV9(); err != nil {
-		return err
-	}
-	// Migrate version '9' to '10'.
-	if err := migrateV9ToV10(); err != nil {
-		return err
-	}
-	// Migrate version '10' to '11'.
-	if err := migrateV10ToV11(); err != nil {
-		return err
-	}
-	// Migrate version '11' to '12'.
-	if err := migrateV11ToV12(); err != nil {
-		return err
-	}
-	// Migrate version '12' to '13'.
-	if err := migrateV12ToV13(); err != nil {
-		return err
-	}
-	// Migrate version '13' to '14'.
-	if err := migrateV13ToV14(); err != nil {
-		return err
-	}
-	// Migrate version '14' to '15'.
-	if err := migrateV14ToV15(); err != nil {
-		return err
-	}
-	// Migrate version '15' to '16'.
-	if err := migrateV15ToV16(); err != nil {
-		return err
-	}
-	// Migrate version '16' to '17'.
-	if err := migrateV16ToV17(); err != nil {
-		return err
-	}
-	// Migrate version '17' to '18'.
-	if err := migrateV17ToV18(); err != nil {
+
+	// Load only config version information.
+	version, err := quick.GetVersion(getConfigFile())
+	if err != nil {
 		return err
 	}
 
-	return nil
+	// Conditional to migrate only relevant config versions.
+	// Upon success migration continues to the next version in sequence.
+	switch version {
+	case "2":
+		// Migrate version '2' to '3'.
+		if err = migrateV2ToV3(); err != nil {
+			return err
+		}
+		fallthrough
+	case "3":
+		// Migrate version '3' to '4'.
+		if err = migrateV3ToV4(); err != nil {
+			return err
+		}
+		fallthrough
+	case "4":
+		// Migrate version '4' to '5'.
+		if err = migrateV4ToV5(); err != nil {
+			return err
+		}
+		fallthrough
+	case "5":
+		// Migrate version '5' to '6.
+		if err = migrateV5ToV6(); err != nil {
+			return err
+		}
+		fallthrough
+	case "6":
+		// Migrate version '6' to '7'.
+		if err = migrateV6ToV7(); err != nil {
+			return err
+		}
+		fallthrough
+	case "7":
+		// Migrate version '7' to '8'.
+		if err = migrateV7ToV8(); err != nil {
+			return err
+		}
+		fallthrough
+	case "8":
+		// Migrate version '8' to '9'.
+		if err = migrateV8ToV9(); err != nil {
+			return err
+		}
+		fallthrough
+	case "9":
+		// Migrate version '9' to '10'.
+		if err = migrateV9ToV10(); err != nil {
+			return err
+		}
+		fallthrough
+	case "10":
+		// Migrate version '10' to '11'.
+		if err = migrateV10ToV11(); err != nil {
+			return err
+		}
+		fallthrough
+	case "11":
+		// Migrate version '11' to '12'.
+		if err = migrateV11ToV12(); err != nil {
+			return err
+		}
+		fallthrough
+	case "12":
+		// Migrate version '12' to '13'.
+		if err = migrateV12ToV13(); err != nil {
+			return err
+		}
+		fallthrough
+	case "13":
+		// Migrate version '13' to '14'.
+		if err = migrateV13ToV14(); err != nil {
+			return err
+		}
+		fallthrough
+	case "14":
+		// Migrate version '14' to '15'.
+		if err = migrateV14ToV15(); err != nil {
+			return err
+		}
+		fallthrough
+	case "15":
+		// Migrate version '15' to '16'.
+		if err = migrateV15ToV16(); err != nil {
+			return err
+		}
+		fallthrough
+	case "16":
+		// Migrate version '16' to '17'.
+		if err = migrateV16ToV17(); err != nil {
+			return err
+		}
+		fallthrough
+	case "17":
+		// Migrate version '17' to '18'.
+		if err = migrateV17ToV18(); err != nil {
+			return err
+		}
+		fallthrough
+	case v18:
+		// No migration needed. this always points to current version.
+		err = nil
+	}
+	return err
 }
 
 // Version '1' is not supported anymore and deprecated, safe to delete.

cmd/config-migrate_test.go

@@ -17,6 +17,7 @@
 package cmd
 
 import (
+	"fmt"
 	"io/ioutil"
 	"os"
 	"testing"
@@ -153,6 +154,7 @@ func TestServerConfigMigrateV2toV18(t *testing.T) {
 	if err := ioutil.WriteFile(configPath, []byte(configJSON), 0644); err != nil {
 		t.Fatal("Unexpected error: ", err)
 	}
+
 	// Fire a migrateConfig()
 	if err := migrateConfig(); err != nil {
 		t.Fatal("Unexpected error: ", err)
@@ -191,7 +193,7 @@ func TestServerConfigMigrateFaultyConfig(t *testing.T) {
 	configPath := rootPath + "/" + minioConfigFile
 
 	// Create a corrupted config file
-	if err := ioutil.WriteFile(configPath, []byte("{ \"version\":\""), 0644); err != nil {
+	if err := ioutil.WriteFile(configPath, []byte("{ \"version\":\"2\", \"test\":"), 0644); err != nil {
 		t.Fatal("Unexpected error: ", err)
 	}
 
@@ -245,3 +247,39 @@ func TestServerConfigMigrateFaultyConfig(t *testing.T) {
 		t.Fatal("migrateConfigV17ToV18() should fail with a corrupted json")
 	}
 }
+
+// Test if all migrate code returns error with corrupted config files
+func TestServerConfigMigrateCorruptedConfig(t *testing.T) {
+	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	if err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+	// remove the root directory after the test ends.
+	defer removeAll(rootPath)
+
+	setConfigDir(rootPath)
+	configPath := rootPath + "/" + minioConfigFile
+
+	for i := 3; i <= 17; i++ {
+		// Create a corrupted config file
+		if err = ioutil.WriteFile(configPath, []byte(fmt.Sprintf("{ \"version\":\"%d\", \"credential\": { \"accessKey\": 1 } }", i)),
+			0644); err != nil {
+			t.Fatal("Unexpected error: ", err)
+		}
+
+		// Test different migrate versions and be sure they are returning an error
+		if err = migrateConfig(); err == nil {
+			t.Fatal("migrateConfig() should fail with a corrupted json")
+		}
+	}
+
+	// Create a corrupted config file for version '2'.
+	if err = ioutil.WriteFile(configPath, []byte("{ \"version\":\"2\", \"credentials\": { \"accessKeyId\": 1 } }"), 0644); err != nil {
+		t.Fatal("Unexpected error: ", err)
+	}
+
+	// Test different migrate versions and be sure they are returning an error
+	if err = migrateConfig(); err == nil {
+		t.Fatal("migrateConfig() should fail with a corrupted json")
+	}
+}

cmd/config-v18.go

@@ -261,11 +261,6 @@ func getValidConfig() (*serverConfigV18, error) {
 		return nil, err
 	}
 
-	// Validate region field
-	if srvCfg.Region == "" {
-		return nil, errors.New("Region config value cannot be empty")
-	}
-
 	// Validate credential fields only when
 	// they are not set via the environment
 

cmd/credential.go

@@ -25,19 +25,35 @@ import (
 )
 
 const (
-	accessKeyMinLen       = 5
-	accessKeyMaxLen       = 20
-	secretKeyMinLen       = 8
-	secretKeyMaxLenAmazon = 40
-	alphaNumericTable     = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-	alphaNumericTableLen  = byte(len(alphaNumericTable))
+	// Minimum length for Minio access key.
+	accessKeyMinLen = 5
+
+	// Maximum length for Minio access key.
+	accessKeyMaxLen = 20
+
+	// Minimum length for Minio secret key for both server and gateway mode.
+	secretKeyMinLen = 8
+
+	// Maximum secret key length for Minio, this
+	// is used when autogenerating new credentials.
+	secretKeyMaxLenMinio = 40
+
+	// Maximum secret key length allowed from client side
+	// caters for both server and gateway mode.
+	secretKeyMaxLen = 100
+
+	// Alpha numeric table used for generating access keys.
+	alphaNumericTable = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+	// Total length of the alpha numeric table.
+	alphaNumericTableLen = byte(len(alphaNumericTable))
 )
 
+// Common errors generated for access and secret key validation.
 var (
 	errInvalidAccessKeyLength = errors.New("Invalid access key, access key should be 5 to 20 characters in length")
-	errInvalidSecretKeyLength = errors.New("Invalid secret key, secret key should be 8 to 40 characters in length")
+	errInvalidSecretKeyLength = errors.New("Invalid secret key, secret key should be 8 to 100 characters in length")
 )
-var secretKeyMaxLen = secretKeyMaxLenAmazon
 
 // isAccessKeyValid - validate access key for right length.
 func isAccessKeyValid(accessKey string) bool {
@@ -111,10 +127,10 @@ func mustGetNewCredential() credential {
 	accessKey := string(keyBytes)
 
 	// Generate secret key.
-	keyBytes = make([]byte, secretKeyMaxLen)
+	keyBytes = make([]byte, secretKeyMaxLenMinio)
 	_, err = rand.Read(keyBytes)
 	fatalIf(err, "Unable to generate secret key.")
-	secretKey := string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyMaxLen])
+	secretKey := string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyMaxLenMinio])
 
 	cred, err := createCredential(accessKey, secretKey)
 	fatalIf(err, "Unable to generate new credential.")

cmd/credential_test.go

@@ -23,6 +23,9 @@ func TestMustGetNewCredential(t *testing.T) {
 	if !cred.IsValid() {
 		t.Fatalf("Failed to get new valid credential")
 	}
+	if len(cred.SecretKey) != secretKeyMaxLenMinio {
+		t.Fatalf("Invalid length %d of the secretKey credential generated, expected %d", len(cred.SecretKey), secretKeyMaxLenMinio)
+	}
 }
 
 func TestCreateCredential(t *testing.T) {
@@ -42,7 +45,7 @@ func TestCreateCredential(t *testing.T) {
 		// Secret key too small.
 		{"myuser", "pass", false, errInvalidSecretKeyLength},
 		// Secret key too long.
-		{"myuser", "pass1234567890123456789012345678901234567", false, errInvalidSecretKeyLength},
+		{"myuser", "pass1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890", false, errInvalidSecretKeyLength},
 		// Success when access key contains leading/trailing spaces.
 		{" user ", cred.SecretKey, true, nil},
 		{"myuser", "mypassword", true, nil},

cmd/endpoint.go

@@ -80,7 +80,7 @@ func (endpoint Endpoint) SetHTTP() {
 func NewEndpoint(arg string) (Endpoint, error) {
 	// isEmptyPath - check whether given path is not empty.
 	isEmptyPath := func(path string) bool {
-		return path == "" || path == "." || path == "/" || path == `\`
+		return path == "" || path == "/" || path == `\`
 	}
 
 	if isEmptyPath(arg) {
@@ -127,14 +127,10 @@ func NewEndpoint(arg string) (Endpoint, error) {
 			return Endpoint{}, fmt.Errorf("empty or root path is not supported in URL endpoint")
 		}
 
-		// Get IPv4 address of the host.
-		hostIPs, err := getHostIP4(host)
+		isLocal, err = isLocalHost(host)
 		if err != nil {
 			return Endpoint{}, err
 		}
-
-		// If intersection of two IP sets is not empty, then the host is local host.
-		isLocal = !localIP4.Intersection(hostIPs).IsEmpty()
 	} else {
 		u = &url.URL{Path: path.Clean(arg)}
 		isLocal = true

cmd/endpoint_test.go

@@ -62,7 +62,6 @@ func TestNewEndpoint(t *testing.T) {
 		{"http://127.0.0.1:8080/path", Endpoint{URL: u3, IsLocal: true}, URLEndpointType, nil},
 		{"http://192.168.253.200/path", Endpoint{URL: u4}, URLEndpointType, nil},
 		{"", Endpoint{}, -1, fmt.Errorf("empty or root endpoint is not supported")},
-		{".", Endpoint{}, -1, fmt.Errorf("empty or root endpoint is not supported")},
 		{"/", Endpoint{}, -1, fmt.Errorf("empty or root endpoint is not supported")},
 		{`\`, Endpoint{}, -1, fmt.Errorf("empty or root endpoint is not supported")},
 		{"c://foo", Endpoint{}, -1, fmt.Errorf("invalid URL endpoint format")},

cmd/erasure-createfile.go

@@ -28,7 +28,9 @@ 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, path string, reader io.Reader, allowEmpty bool, blockSize int64, dataBlocks int, parityBlocks int, algo string, writeQuorum int) (bytesWritten int64, checkSums []string, err error) {
+func erasureCreateFile(disks []StorageAPI, volume, path string, reader io.Reader, allowEmpty bool, blockSize int64,
+	dataBlocks, parityBlocks int, algo HashAlgo, writeQuorum int) (bytesWritten int64, checkSums []string, err error) {
+
 	// Allocated blockSized buffer for reading from incoming stream.
 	buf := make([]byte, blockSize)
 

cmd/erasure-healfile.go

@@ -19,7 +19,9 @@ 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) {
+func erasureHealFile(latestDisks []StorageAPI, outDatedDisks []StorageAPI, volume, path, healBucket, healPath string,
+	size, blockSize int64, dataBlocks, parityBlocks int, algo HashAlgo) (checkSums []string, err error) {
+
 	var offset int64
 	remainingSize := size
 

cmd/erasure-readfile.go

@@ -17,7 +17,6 @@
 package cmd
 
 import (
-	"encoding/hex"
 	"errors"
 	"io"
 	"sync"
@@ -111,7 +110,9 @@ func getReadDisks(orderedDisks []StorageAPI, index int, dataBlocks int) (readDis
 }
 
 // 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) {
+func parallelRead(volume, path string, readDisks, orderedDisks []StorageAPI, enBlocks [][]byte,
+	blockOffset, curChunkSize int64, brVerifiers []bitRotVerifier, pool *bpool.BytePool) {
+
 	// WaitGroup to synchronise the read go-routines.
 	wg := &sync.WaitGroup{}
 
@@ -125,11 +126,15 @@ func parallelRead(volume, path string, readDisks []StorageAPI, orderedDisks []St
 		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
+			// evaluate if we need to perform bit-rot checking
+			needBitRotVerification := true
+			if brVerifiers[index].isVerified {
+				needBitRotVerification = false
+				// if file has bit-rot, do not reuse disk
+				if brVerifiers[index].hasBitRot {
+					orderedDisks[index] = nil
+					return
+				}
 			}
 
 			buf, err := pool.Get()
@@ -140,7 +145,25 @@ func parallelRead(volume, path string, readDisks []StorageAPI, orderedDisks []St
 			}
 			buf = buf[:curChunkSize]
 
-			_, err = readDisks[index].ReadFile(volume, path, blockOffset, buf)
+			if needBitRotVerification {
+				_, err = readDisks[index].ReadFileWithVerify(
+					volume, path, blockOffset, buf,
+					brVerifiers[index].algo,
+					brVerifiers[index].checkSum)
+			} else {
+				_, err = readDisks[index].ReadFile(volume, path,
+					blockOffset, buf)
+			}
+
+			// if bit-rot verification was done, store the
+			// result of verification so we can skip
+			// re-doing it next time
+			if needBitRotVerification {
+				brVerifiers[index].isVerified = true
+				_, ok := err.(hashMismatchError)
+				brVerifiers[index].hasBitRot = ok
+			}
+
 			if err != nil {
 				orderedDisks[index] = nil
 				return
@@ -153,12 +176,16 @@ func parallelRead(volume, path string, readDisks []StorageAPI, orderedDisks []St
 	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) {
+// 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, path string,
+	offset, length, totalLength, blockSize int64, dataBlocks, parityBlocks int,
+	checkSums []string, algo HashAlgo, pool *bpool.BytePool) (int64, error) {
+
 	// Offset and length cannot be negative.
 	if offset < 0 || length < 0 {
 		return 0, traceError(errUnexpected)
@@ -169,27 +196,15 @@ func erasureReadFile(writer io.Writer, disks []StorageAPI, volume string, path s
 		return 0, traceError(errUnexpected)
 	}
 
-	// chunkSize is the amount of data that needs to be read from each disk at a time.
+	// 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
-		}
-	}()
+	brVerifiers := make([]bitRotVerifier, len(disks))
+	for i := range brVerifiers {
+		brVerifiers[i].algo = algo
+		brVerifiers[i].checkSum = checkSums[i]
+	}
 
 	// Total bytes written to writer
 	var bytesWritten int64
@@ -241,7 +256,7 @@ func erasureReadFile(writer io.Writer, disks []StorageAPI, volume string, path s
 				return bytesWritten, err
 			}
 			// Issue a parallel read across the disks specified in readDisks.
-			parallelRead(volume, path, readDisks, disks, enBlocks, blockOffset, curChunkSize, bitRotVerify, pool)
+			parallelRead(volume, path, readDisks, disks, enBlocks, blockOffset, curChunkSize, brVerifiers, pool)
 			if isSuccessDecodeBlocks(enBlocks, dataBlocks) {
 				// If enough blocks are available to do rs.Reconstruct()
 				break
@@ -299,27 +314,6 @@ func erasureReadFile(writer io.Writer, disks []StorageAPI, volume string, path s
 	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.

cmd/erasure-readfile_test.go

@@ -213,6 +213,12 @@ func (r ReadDiskDown) ReadFile(volume string, path string, offset int64, buf []b
 	return 0, errFaultyDisk
 }
 
+func (r ReadDiskDown) ReadFileWithVerify(volume string, path string, offset int64, buf []byte,
+	algo HashAlgo, expectedHash string) (n int64, err error) {
+
+	return 0, errFaultyDisk
+}
+
 func TestErasureReadFileDiskFail(t *testing.T) {
 	// Initialize environment needed for the test.
 	dataBlocks := 7

cmd/erasure-utils.go

@@ -29,7 +29,7 @@ import (
 )
 
 // newHashWriters - inititialize a slice of hashes for the disk count.
-func newHashWriters(diskCount int, algo string) []hash.Hash {
+func newHashWriters(diskCount int, algo HashAlgo) []hash.Hash {
 	hashWriters := make([]hash.Hash, diskCount)
 	for index := range hashWriters {
 		hashWriters[index] = newHash(algo)
@@ -38,13 +38,13 @@ func newHashWriters(diskCount int, algo string) []hash.Hash {
 }
 
 // newHash - gives you a newly allocated hash depending on the input algorithm.
-func newHash(algo string) (h hash.Hash) {
+func newHash(algo HashAlgo) (h hash.Hash) {
 	switch algo {
-	case sha256Algo:
+	case HashSha256:
 		// sha256 checksum specially on ARM64 platforms or whenever
 		// requested as dictated by `xl.json` entry.
 		h = sha256.New()
-	case blake2bAlgo:
+	case HashBlake2b:
 		// ignore the error, because New512 without a key never fails
 		// New512 only returns a non-nil error, if the length of the passed
 		// key > 64 bytes - but we use blake2b as hash function (no key)
@@ -71,7 +71,7 @@ var hashBufferPool = sync.Pool{
 
 // hashSum calculates the hash of the entire path and returns.
 func hashSum(disk StorageAPI, volume, path string, writer hash.Hash) ([]byte, error) {
-	// Fetch staging a new staging buffer from the pool.
+	// Fetch a new staging buffer from the pool.
 	bufp := hashBufferPool.Get().(*[]byte)
 	defer hashBufferPool.Put(bufp)
 
@@ -207,3 +207,16 @@ func copyBuffer(writer io.Writer, disk StorageAPI, volume string, path string, b
 	// Success.
 	return nil
 }
+
+// bitRotVerifier - type representing bit-rot verification process for
+// a single under-lying object (currently whole files)
+type bitRotVerifier struct {
+	// has the bit-rot verification been done?
+	isVerified bool
+	// is the data free of bit-rot?
+	hasBitRot bool
+	// hashing algorithm
+	algo HashAlgo
+	// hex-encoded expected raw-hash value
+	checkSum string
+}

cmd/event-notifier.go

@@ -172,7 +172,7 @@ func newNotificationEvent(event eventData) NotificationEvent {
 	// For all other events we should set ETag and Size.
 	nEvent.S3.Object = objectMeta{
 		Key:         escapedObj,
-		ETag:        event.ObjInfo.MD5Sum,
+		ETag:        event.ObjInfo.ETag,
 		Size:        event.ObjInfo.Size,
 		ContentType: event.ObjInfo.ContentType,
 		UserDefined: event.ObjInfo.UserDefined,

cmd/event-notifier_test.go

@@ -45,7 +45,7 @@ func TestInitEventNotifierFaultyDisks(t *testing.T) {
 	}
 
 	bucketName := "bucket"
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Unexpected error:", err)
 	}
 
@@ -343,7 +343,7 @@ func TestInitEventNotifier(t *testing.T) {
 	}
 
 	// create bucket
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Unexpected error:", err)
 	}
 
@@ -408,7 +408,7 @@ func TestListenBucketNotification(t *testing.T) {
 	objectName := "object"
 
 	// Create the bucket to listen on
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Unexpected error:", err)
 	}
 
@@ -518,7 +518,7 @@ func TestAddRemoveBucketListenerConfig(t *testing.T) {
 
 	// Make a bucket to store topicConfigs.
 	randBucket := getRandomBucketName()
-	if err := obj.MakeBucket(randBucket); err != nil {
+	if err := obj.MakeBucketWithLocation(randBucket, ""); err != nil {
 		t.Fatalf("Failed to make bucket %s", randBucket)
 	}
 

cmd/format-config-v1.go

@@ -20,8 +20,12 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
+	"io/ioutil"
 	"reflect"
 	"sync"
+
+	"github.com/minio/minio/pkg/lock"
 )
 
 // fsFormat - structure holding 'fs' format.
@@ -29,6 +33,15 @@ type fsFormat struct {
 	Version string `json:"version"`
 }
 
+// FS format version strings.
+const (
+	// Represents the current backend disk structure
+	// version under `.minio.sys` and actual data namespace.
+
+	// formatConfigV1.fsFormat.Version
+	fsFormatBackendV1 = "1"
+)
+
 // xlFormat - structure holding 'xl' format.
 type xlFormat struct {
 	Version string `json:"version"` // Version of 'xl' format.
@@ -38,6 +51,15 @@ type xlFormat struct {
 	JBOD []string `json:"jbod"`
 }
 
+// XL format version strings.
+const (
+	// Represents the current backend disk structure
+	// version under `.minio.sys` and actual data namespace.
+
+	// formatConfigV1.xlFormat.Version
+	xlFormatBackendV1 = "1"
+)
+
 // formatConfigV1 - structure holds format config version '1'.
 type formatConfigV1 struct {
 	Version string `json:"version"` // Version of the format config.
@@ -47,6 +69,120 @@ type formatConfigV1 struct {
 	XL     *xlFormat `json:"xl,omitempty"` // XL field holds xl format.
 }
 
+// Format json file.
+const (
+	// Format config file carries backend format specific details.
+	formatConfigFile = "format.json"
+
+	// Format config tmp file carries backend format.
+	formatConfigFileTmp = "format.json.tmp"
+)
+
+// `format.json` version value.
+const (
+	// formatConfigV1.Version represents the version string
+	// of the current structure and its fields in `format.json`.
+	formatFileV1 = "1"
+
+	// Future `format.json` structure changes should have
+	// its own version and should be subsequently listed here.
+)
+
+// Constitutes `format.json` backend name.
+const (
+	// Represents FS backend.
+	formatBackendFS = "fs"
+
+	// Represents XL backend.
+	formatBackendXL = "xl"
+)
+
+// CheckFS if the format is FS and is valid with right values
+// returns appropriate errors otherwise.
+func (f *formatConfigV1) CheckFS() error {
+	// Validate if format config version is v1.
+	if f.Version != formatFileV1 {
+		return fmt.Errorf("Unknown format file version '%s'", f.Version)
+	}
+
+	// Validate if we have the expected format.
+	if f.Format != formatBackendFS {
+		return fmt.Errorf("FS backend format required. Found '%s'", f.Format)
+	}
+
+	// Check if format is currently supported.
+	if f.FS.Version != fsFormatBackendV1 {
+		return fmt.Errorf("Unknown backend FS format version '%s'", f.FS.Version)
+	}
+
+	// Success.
+	return nil
+}
+
+// LoadFormat - loads format config v1, returns `errUnformattedDisk`
+// if reading format.json fails with io.EOF.
+func (f *formatConfigV1) LoadFormat(lk *lock.LockedFile) error {
+	_, err := f.ReadFrom(lk)
+	if errorCause(err) == io.EOF {
+		// No data on disk `format.json` still empty
+		// treat it as unformatted disk.
+		return traceError(errUnformattedDisk)
+	}
+	return err
+}
+
+func (f *formatConfigV1) WriteTo(lk *lock.LockedFile) (n int64, err error) {
+	// Serialize to prepare to write to disk.
+	var fbytes []byte
+	fbytes, err = json.Marshal(f)
+	if err != nil {
+		return 0, traceError(err)
+	}
+	if err = lk.Truncate(0); err != nil {
+		return 0, traceError(err)
+	}
+	_, err = lk.Write(fbytes)
+	if err != nil {
+		return 0, traceError(err)
+	}
+	return int64(len(fbytes)), nil
+}
+
+func (f *formatConfigV1) ReadFrom(lk *lock.LockedFile) (n int64, err error) {
+	var fbytes []byte
+	fi, err := lk.Stat()
+	if err != nil {
+		return 0, traceError(err)
+	}
+	fbytes, err = ioutil.ReadAll(io.NewSectionReader(lk, 0, fi.Size()))
+	if err != nil {
+		return 0, traceError(err)
+	}
+	if len(fbytes) == 0 {
+		return 0, traceError(io.EOF)
+	}
+	// Decode `format.json`.
+	if err = json.Unmarshal(fbytes, f); err != nil {
+		return 0, traceError(err)
+	}
+	return int64(len(fbytes)), nil
+}
+
+func newFSFormat() (format *formatConfigV1) {
+	return newFSFormatV1()
+}
+
+// newFSFormatV1 - initializes new formatConfigV1 with FS format info.
+func newFSFormatV1() (format *formatConfigV1) {
+	return &formatConfigV1{
+		Version: formatFileV1,
+		Format:  formatBackendFS,
+		FS: &fsFormat{
+			Version: fsFormatBackendV1,
+		},
+	}
+}
+
 /*
 
 All disks online
@@ -770,10 +906,10 @@ func loadFormatXL(bootstrapDisks []StorageAPI, readQuorum int) (disks []StorageA
 
 func checkFormatXLValue(formatXL *formatConfigV1) error {
 	// Validate format version and format type.
-	if formatXL.Version != "1" {
+	if formatXL.Version != formatFileV1 {
 		return fmt.Errorf("Unsupported version of backend format [%s] found", formatXL.Version)
 	}
-	if formatXL.Format != "xl" {
+	if formatXL.Format != formatBackendXL {
 		return fmt.Errorf("Unsupported backend format [%s] found", formatXL.Format)
 	}
 	if formatXL.XL.Version != "1" {
@@ -875,10 +1011,10 @@ func initFormatXL(storageDisks []StorageAPI) (err error) {
 		}
 		// Allocate format config.
 		formats[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    mustGetUUID(),
 			},
 		}

cmd/format-config-v1_test.go

@@ -18,7 +18,12 @@ package cmd
 
 import (
 	"bytes"
+	"errors"
+	"os"
+	"path/filepath"
 	"testing"
+
+	"github.com/minio/minio/pkg/lock"
 )
 
 // generates a valid format.json for XL backend.
@@ -30,10 +35,10 @@ func genFormatXLValid() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -51,10 +56,10 @@ func genFormatXLInvalidVersion() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -75,10 +80,10 @@ func genFormatXLInvalidFormat() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -99,10 +104,10 @@ func genFormatXLInvalidXLVersion() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -116,8 +121,8 @@ func genFormatXLInvalidXLVersion() []*formatConfigV1 {
 
 func genFormatFS() *formatConfigV1 {
 	return &formatConfigV1{
-		Version: "1",
-		Format:  "fs",
+		Version: formatFileV1,
+		Format:  formatBackendFS,
 	}
 }
 
@@ -130,10 +135,10 @@ func genFormatXLInvalidJBODCount() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -151,10 +156,10 @@ func genFormatXLInvalidJBOD() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -178,10 +183,10 @@ func genFormatXLInvalidDisks() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -202,10 +207,10 @@ func genFormatXLInvalidDisksOrder() []*formatConfigV1 {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -223,7 +228,7 @@ func prepareFormatXLHealFreshDisks(obj ObjectLayer) ([]StorageAPI, error) {
 	var err error
 	xl := obj.(*xlObjects)
 
-	err = obj.MakeBucket("bucket")
+	err = obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		return []StorageAPI{}, err
 	}
@@ -240,10 +245,10 @@ func prepareFormatXLHealFreshDisks(obj ObjectLayer) ([]StorageAPI, error) {
 	// 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 {
+		if err = xl.storageDisks[i].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 			return []StorageAPI{}, err
 		}
-		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "tmp"); err != nil {
+		if err = xl.storageDisks[i].DeleteFile(minioMetaBucket, "tmp"); err != nil {
 			return []StorageAPI{}, err
 		}
 		if err = xl.storageDisks[i].DeleteFile(bucket, object+"/xl.json"); err != nil {
@@ -346,7 +351,7 @@ func TestFormatXLHealCorruptedDisks(t *testing.T) {
 
 	xl := obj.(*xlObjects)
 
-	err = obj.MakeBucket("bucket")
+	err = obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -361,19 +366,19 @@ func TestFormatXLHealCorruptedDisks(t *testing.T) {
 	}
 
 	// Now, remove two format files.. Load them and reorder
-	if err = xl.storageDisks[3].DeleteFile(".minio.sys", "format.json"); err != nil {
+	if err = xl.storageDisks[3].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 		t.Fatal(err)
 	}
-	if err = xl.storageDisks[11].DeleteFile(".minio.sys", "format.json"); err != nil {
+	if err = xl.storageDisks[11].DeleteFile(minioMetaBucket, formatConfigFile); 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 {
+	if err = xl.storageDisks[10].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 		t.Fatal(err)
 	}
-	if err = xl.storageDisks[10].DeleteFile(".minio.sys", "tmp"); err != nil {
+	if err = xl.storageDisks[10].DeleteFile(minioMetaBucket, "tmp"); err != nil {
 		t.Fatal(err)
 	}
 	if err = xl.storageDisks[10].DeleteFile(bucket, object+"/xl.json"); err != nil {
@@ -419,7 +424,7 @@ func TestFormatXLReorderByInspection(t *testing.T) {
 
 	xl := obj.(*xlObjects)
 
-	err = obj.MakeBucket("bucket")
+	err = obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -434,10 +439,10 @@ func TestFormatXLReorderByInspection(t *testing.T) {
 	}
 
 	// Now, remove two format files.. Load them and reorder
-	if err = xl.storageDisks[3].DeleteFile(".minio.sys", "format.json"); err != nil {
+	if err = xl.storageDisks[3].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 		t.Fatal(err)
 	}
-	if err = xl.storageDisks[5].DeleteFile(".minio.sys", "format.json"); err != nil {
+	if err = xl.storageDisks[5].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 		t.Fatal(err)
 	}
 
@@ -555,10 +560,10 @@ func TestSavedUUIDOrder(t *testing.T) {
 	}
 	for index := range jbod {
 		formatConfigs[index] = &formatConfigV1{
-			Version: "1",
-			Format:  "xl",
+			Version: formatFileV1,
+			Format:  formatBackendXL,
 			XL: &xlFormat{
-				Version: "1",
+				Version: xlFormatBackendV1,
 				Disk:    jbod[index],
 				JBOD:    jbod,
 			},
@@ -682,6 +687,163 @@ func TestGenericFormatCheckXL(t *testing.T) {
 	}
 }
 
+// TestFSCheckFormatFSErr - test loadFormatFS loading older format.
+func TestFSCheckFormatFSErr(t *testing.T) {
+	// Prepare for testing
+	disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())
+	defer removeAll(disk)
+
+	// Assign a new UUID.
+	uuid := mustGetUUID()
+
+	// Initialize meta volume, if volume already exists ignores it.
+	if err := initMetaVolumeFS(disk, uuid); err != nil {
+		t.Fatal(err)
+	}
+
+	testCases := []struct {
+		format         *formatConfigV1
+		formatWriteErr error
+		formatCheckErr error
+		shouldPass     bool
+	}{
+		{
+			format: &formatConfigV1{
+				Version: formatFileV1,
+				Format:  formatBackendFS,
+				FS: &fsFormat{
+					Version: fsFormatBackendV1,
+				},
+			},
+			formatCheckErr: nil,
+			shouldPass:     true,
+		},
+		{
+			format: &formatConfigV1{
+				Version: formatFileV1,
+				Format:  formatBackendFS,
+				FS: &fsFormat{
+					Version: "10",
+				},
+			},
+			formatCheckErr: errors.New("Unknown backend FS format version '10'"),
+			shouldPass:     false,
+		},
+		{
+			format: &formatConfigV1{
+				Version: formatFileV1,
+				Format:  "garbage",
+				FS: &fsFormat{
+					Version: fsFormatBackendV1,
+				},
+			},
+			formatCheckErr: errors.New("FS backend format required. Found 'garbage'"),
+		},
+		{
+			format: &formatConfigV1{
+				Version: "-1",
+				Format:  formatBackendFS,
+				FS: &fsFormat{
+					Version: fsFormatBackendV1,
+				},
+			},
+			formatCheckErr: errors.New("Unknown format file version '-1'"),
+		},
+	}
+
+	fsFormatPath := pathJoin(disk, minioMetaBucket, formatConfigFile)
+	for i, testCase := range testCases {
+		lk, err := lock.LockedOpenFile(preparePath(fsFormatPath), os.O_RDWR|os.O_CREATE, 0600)
+		if err != nil {
+			t.Fatal(err)
+		}
+		_, err = testCase.format.WriteTo(lk)
+		lk.Close()
+		if err != nil {
+			t.Fatalf("Test %d: Expected nil, got %s", i+1, err)
+		}
+
+		lk, err = lock.LockedOpenFile(preparePath(fsFormatPath), os.O_RDWR|os.O_CREATE, 0600)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		formatCfg := &formatConfigV1{}
+		_, err = formatCfg.ReadFrom(lk)
+		lk.Close()
+		if err != nil {
+			t.Fatal(err)
+		}
+		err = formatCfg.CheckFS()
+		if err != nil && testCase.shouldPass {
+			t.Errorf("Test %d: Should not fail with unexpected %s, expected nil", i+1, err)
+		}
+		if err == nil && !testCase.shouldPass {
+			t.Errorf("Test %d: Should fail with expected %s, got nil", i+1, testCase.formatCheckErr)
+		}
+		if err != nil && !testCase.shouldPass {
+			if errorCause(err).Error() != testCase.formatCheckErr.Error() {
+				t.Errorf("Test %d: Should fail with expected %s, got %s", i+1, testCase.formatCheckErr, err)
+			}
+		}
+	}
+}
+
+// TestFSCheckFormatFS - test loadFormatFS with healty and faulty disks
+func TestFSCheckFormatFS(t *testing.T) {
+	// Prepare for testing
+	disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())
+	defer removeAll(disk)
+
+	// Assign a new UUID.
+	uuid := mustGetUUID()
+
+	// Initialize meta volume, if volume already exists ignores it.
+	if err := initMetaVolumeFS(disk, uuid); err != nil {
+		t.Fatal(err)
+	}
+
+	fsFormatPath := pathJoin(disk, minioMetaBucket, formatConfigFile)
+	lk, err := lock.LockedOpenFile(preparePath(fsFormatPath), os.O_RDWR|os.O_CREATE, 0600)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	format := newFSFormatV1()
+	_, err = format.WriteTo(lk)
+	lk.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Loading corrupted format file
+	file, err := os.OpenFile(preparePath(fsFormatPath), os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0666)
+	if err != nil {
+		t.Fatal("Should not fail here", err)
+	}
+	file.Write([]byte{'b'})
+	file.Close()
+
+	lk, err = lock.LockedOpenFile(preparePath(fsFormatPath), os.O_RDWR|os.O_CREATE, 0600)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	format = &formatConfigV1{}
+	_, err = format.ReadFrom(lk)
+	lk.Close()
+	if err == nil {
+		t.Fatal("Should return an error here")
+	}
+
+	// Loading format file from disk not found.
+	removeAll(disk)
+	_, err = lock.LockedOpenFile(preparePath(fsFormatPath), os.O_RDONLY, 0600)
+	if err != nil && !os.IsNotExist(err) {
+		t.Fatal("Should return 'format.json' does not exist, but got", err)
+	}
+}
+
 func TestLoadFormatXLErrs(t *testing.T) {
 	nDisks := 16
 	fsDirs, err := getRandomDisks(nDisks)
@@ -749,7 +911,7 @@ func TestLoadFormatXLErrs(t *testing.T) {
 
 	// disks 0..10 returns unformatted disk
 	for i := 0; i <= 10; i++ {
-		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+		if err = xl.storageDisks[i].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -873,7 +1035,7 @@ func TestHealFormatXLCorruptedDisksErrs(t *testing.T) {
 	}
 	xl = obj.(*xlObjects)
 	for i := 0; i <= 15; i++ {
-		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+		if err = xl.storageDisks[i].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -894,7 +1056,7 @@ func TestHealFormatXLCorruptedDisksErrs(t *testing.T) {
 	}
 	xl = obj.(*xlObjects)
 	for i := 0; i <= 15; i++ {
-		if err = xl.storageDisks[i].AppendFile(".minio.sys", "format.json", []byte("corrupted data")); err != nil {
+		if err = xl.storageDisks[i].AppendFile(minioMetaBucket, formatConfigFile, []byte("corrupted data")); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -998,7 +1160,7 @@ func TestHealFormatXLFreshDisksErrs(t *testing.T) {
 	}
 	xl = obj.(*xlObjects)
 	for i := 0; i <= 15; i++ {
-		if err = xl.storageDisks[i].DeleteFile(".minio.sys", "format.json"); err != nil {
+		if err = xl.storageDisks[i].DeleteFile(minioMetaBucket, formatConfigFile); err != nil {
 			t.Fatal(err)
 		}
 	}

cmd/fs-v1-helpers.go

@@ -123,18 +123,27 @@ func fsMkdir(dirPath string) (err error) {
 	return nil
 }
 
-// Lookup if directory exists, returns directory
-// attributes upon success.
-func fsStatDir(statDir string) (os.FileInfo, error) {
-	if statDir == "" {
+func fsStat(statLoc string) (os.FileInfo, error) {
+	if statLoc == "" {
 		return nil, traceError(errInvalidArgument)
 	}
-	if err := checkPathLength(statDir); err != nil {
+	if err := checkPathLength(statLoc); err != nil {
+		return nil, traceError(err)
+	}
+	fi, err := osStat(preparePath(statLoc))
+	if err != nil {
 		return nil, traceError(err)
 	}
 
-	fi, err := osStat(preparePath(statDir))
+	return fi, nil
+}
+
+// Lookup if directory exists, returns directory
+// attributes upon success.
+func fsStatDir(statDir string) (os.FileInfo, error) {
+	fi, err := fsStat(statDir)
 	if err != nil {
+		err = errorCause(err)
 		if os.IsNotExist(err) {
 			return nil, traceError(errVolumeNotFound)
 		} else if os.IsPermission(err) {
@@ -152,16 +161,9 @@ func fsStatDir(statDir string) (os.FileInfo, error) {
 
 // Lookup if file exists, returns file attributes upon success
 func fsStatFile(statFile string) (os.FileInfo, error) {
-	if statFile == "" {
-		return nil, traceError(errInvalidArgument)
-	}
-
-	if err := checkPathLength(statFile); err != nil {
-		return nil, traceError(err)
-	}
-
-	fi, err := osStat(preparePath(statFile))
+	fi, err := fsStat(statFile)
 	if err != nil {
+		err = errorCause(err)
 		if os.IsNotExist(err) {
 			return nil, traceError(errFileNotFound)
 		} else if os.IsPermission(err) {
@@ -174,7 +176,7 @@ func fsStatFile(statFile string) (os.FileInfo, error) {
 		return nil, traceError(err)
 	}
 	if fi.IsDir() {
-		return nil, traceError(errFileNotFound)
+		return nil, traceError(errFileAccessDenied)
 	}
 	return fi, nil
 }
@@ -230,7 +232,7 @@ func fsOpenFile(readPath string, offset int64) (io.ReadCloser, int64, error) {
 
 // Creates a file and copies data from incoming reader. Staging buffer is used by io.CopyBuffer.
 func fsCreateFile(filePath string, reader io.Reader, buf []byte, fallocSize int64) (int64, error) {
-	if filePath == "" || reader == nil || buf == nil {
+	if filePath == "" || reader == nil {
 		return 0, traceError(errInvalidArgument)
 	}
 
@@ -263,11 +265,18 @@ func fsCreateFile(filePath string, reader io.Reader, buf []byte, fallocSize int6
 		}
 	}
 
-	bytesWritten, err := io.CopyBuffer(writer, reader, buf)
-	if err != nil {
-		return 0, traceError(err)
+	var bytesWritten int64
+	if buf != nil {
+		bytesWritten, err = io.CopyBuffer(writer, reader, buf)
+		if err != nil {
+			return 0, traceError(err)
+		}
+	} else {
+		bytesWritten, err = io.Copy(writer, reader)
+		if err != nil {
+			return 0, traceError(err)
+		}
 	}
-
 	return bytesWritten, nil
 }
 
@@ -276,6 +285,12 @@ func fsRemoveUploadIDPath(basePath, uploadIDPath string) error {
 	if basePath == "" || uploadIDPath == "" {
 		return traceError(errInvalidArgument)
 	}
+	if err := checkPathLength(basePath); err != nil {
+		return traceError(err)
+	}
+	if err := checkPathLength(uploadIDPath); err != nil {
+		return traceError(err)
+	}
 
 	// List all the entries in uploadID.
 	entries, err := readDir(uploadIDPath)
@@ -319,6 +334,26 @@ func fsFAllocate(fd int, offset int64, len int64) (err error) {
 // Renames source path to destination path, creates all the
 // missing parents if they don't exist.
 func fsRenameFile(sourcePath, destPath string) error {
+	if err := checkPathLength(sourcePath); err != nil {
+		return traceError(err)
+	}
+	if err := checkPathLength(destPath); err != nil {
+		return traceError(err)
+	}
+	// Verify if source path exists.
+	if _, err := os.Stat(preparePath(sourcePath)); err != nil {
+		if os.IsNotExist(err) {
+			return traceError(errFileNotFound)
+		} else if os.IsPermission(err) {
+			return traceError(errFileAccessDenied)
+		} else if isSysErrPathNotFound(err) {
+			return traceError(errFileNotFound)
+		} else if isSysErrNotDir(err) {
+			// File path cannot be verified since one of the parents is a file.
+			return traceError(errFileAccessDenied)
+		}
+		return traceError(err)
+	}
 	if err := mkdirAll(pathutil.Dir(destPath), 0777); err != nil {
 		return traceError(err)
 	}

cmd/fs-v1-helpers_test.go

@@ -26,6 +26,31 @@ import (
 	"github.com/minio/minio/pkg/lock"
 )
 
+func TestFSRenameFile(t *testing.T) {
+	// create posix test setup
+	_, path, err := newPosixTestSetup()
+	if err != nil {
+		t.Fatalf("Unable to create posix test setup, %s", err)
+	}
+	defer removeAll(path)
+
+	if err = fsMkdir(pathJoin(path, "testvolume1")); err != nil {
+		t.Fatal(err)
+	}
+	if err = fsRenameFile(pathJoin(path, "testvolume1"), pathJoin(path, "testvolume2")); err != nil {
+		t.Fatal(err)
+	}
+	if err = fsRenameFile(pathJoin(path, "testvolume1"), pathJoin(path, "testvolume2")); errorCause(err) != errFileNotFound {
+		t.Fatal(err)
+	}
+	if err = fsRenameFile(pathJoin(path, "my-obj-del-0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001"), pathJoin(path, "testvolume2")); errorCause(err) != errFileNameTooLong {
+		t.Fatal("Unexpected error", err)
+	}
+	if err = fsRenameFile(pathJoin(path, "testvolume1"), pathJoin(path, "my-obj-del-0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001")); errorCause(err) != errFileNameTooLong {
+		t.Fatal("Unexpected error", err)
+	}
+}
+
 func TestFSStats(t *testing.T) {
 	// create posix test setup
 	_, path, err := newPosixTestSetup()
@@ -48,9 +73,8 @@ func TestFSStats(t *testing.T) {
 		t.Fatalf("Unable to create volume, %s", err)
 	}
 
-	var buf = make([]byte, 4096)
 	var reader = bytes.NewReader([]byte("Hello, world"))
-	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file"), reader, buf, reader.Size()); err != nil {
+	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file"), reader, nil, 0); err != nil {
 		t.Fatalf("Unable to create file, %s", err)
 	}
 	// Seek back.
@@ -60,7 +84,7 @@ func TestFSStats(t *testing.T) {
 		t.Fatal("Unexpected error", err)
 	}
 
-	if _, err = fsCreateFile(pathJoin(path, "success-vol", "path/to/success-file"), reader, buf, reader.Size()); err != nil {
+	if _, err = fsCreateFile(pathJoin(path, "success-vol", "path/to/success-file"), reader, nil, 0); err != nil {
 		t.Fatalf("Unable to create file, %s", err)
 	}
 	// Seek back.
@@ -110,7 +134,7 @@ func TestFSStats(t *testing.T) {
 			srcFSPath:   path,
 			srcVol:      "success-vol",
 			srcPath:     "path",
-			expectedErr: errFileNotFound,
+			expectedErr: errFileAccessDenied,
 		},
 		// Test case - 6.
 		// Test case with src path segment > 255.
@@ -143,7 +167,8 @@ func TestFSStats(t *testing.T) {
 
 	for i, testCase := range testCases {
 		if testCase.srcPath != "" {
-			if _, err := fsStatFile(pathJoin(testCase.srcFSPath, testCase.srcVol, testCase.srcPath)); errorCause(err) != testCase.expectedErr {
+			if _, err := fsStatFile(pathJoin(testCase.srcFSPath, testCase.srcVol,
+				testCase.srcPath)); errorCause(err) != testCase.expectedErr {
 				t.Fatalf("TestPosix case %d: Expected: \"%s\", got: \"%s\"", i+1, testCase.expectedErr, err)
 			}
 		} else {
@@ -174,9 +199,8 @@ func TestFSCreateAndOpen(t *testing.T) {
 		t.Fatal("Unexpected error", err)
 	}
 
-	var buf = make([]byte, 4096)
 	var reader = bytes.NewReader([]byte("Hello, world"))
-	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file"), reader, buf, reader.Size()); err != nil {
+	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file"), reader, nil, 0); err != nil {
 		t.Fatalf("Unable to create file, %s", err)
 	}
 	// Seek back.
@@ -204,7 +228,7 @@ func TestFSCreateAndOpen(t *testing.T) {
 	}
 
 	for i, testCase := range testCases {
-		_, err = fsCreateFile(pathJoin(path, testCase.srcVol, testCase.srcPath), reader, buf, reader.Size())
+		_, err = fsCreateFile(pathJoin(path, testCase.srcVol, testCase.srcPath), reader, nil, 0)
 		if errorCause(err) != testCase.expectedErr {
 			t.Errorf("Test case %d: Expected: \"%s\", got: \"%s\"", i+1, testCase.expectedErr, err)
 		}
@@ -297,15 +321,14 @@ func TestFSRemoves(t *testing.T) {
 		t.Fatalf("Unable to create directory, %s", err)
 	}
 
-	var buf = make([]byte, 4096)
 	var reader = bytes.NewReader([]byte("Hello, world"))
-	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file"), reader, buf, reader.Size()); err != nil {
+	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file"), reader, nil, 0); err != nil {
 		t.Fatalf("Unable to create file, %s", err)
 	}
 	// Seek back.
 	reader.Seek(0, 0)
 
-	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file-new"), reader, buf, reader.Size()); err != nil {
+	if _, err = fsCreateFile(pathJoin(path, "success-vol", "success-file-new"), reader, nil, 0); err != nil {
 		t.Fatalf("Unable to create file, %s", err)
 	}
 	// Seek back.
@@ -417,9 +440,8 @@ func TestFSRemoveMeta(t *testing.T) {
 
 	filePath := pathJoin(fsPath, "success-vol", "success-file")
 
-	var buf = make([]byte, 4096)
 	var reader = bytes.NewReader([]byte("Hello, world"))
-	if _, err = fsCreateFile(filePath, reader, buf, reader.Size()); err != nil {
+	if _, err = fsCreateFile(filePath, reader, nil, 0); err != nil {
 		t.Fatalf("Unable to create file, %s", err)
 	}
 

cmd/fs-v1-metadata.go

@@ -24,15 +24,31 @@ import (
 	pathutil "path"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/minio/minio/pkg/lock"
 	"github.com/minio/minio/pkg/mimedb"
 	"github.com/tidwall/gjson"
 )
 
+// FS format, and object metadata.
 const (
-	fsMetaJSONFile   = "fs.json"
-	fsFormatJSONFile = "format.json"
+	// fs.json object metadata.
+	fsMetaJSONFile = "fs.json"
+)
+
+// FS metadata constants.
+const (
+	// FS backend meta 1.0.0 version.
+	fsMetaVersion100 = "1.0.0"
+
+	// FS backend meta 1.0.1 version.
+	fsMetaVersion = "1.0.1"
+
+	// FS backend meta format.
+	fsMetaFormat = "fs"
+
+	// Add more constants here.
 )
 
 // A fsMetaV1 represents a metadata header mapping keys to sets of values.
@@ -47,6 +63,19 @@ type fsMetaV1 struct {
 	Parts []objectPartInfo  `json:"parts,omitempty"`
 }
 
+// IsValid - tells if the format is sane by validating the version
+// string and format style.
+func (m fsMetaV1) IsValid() bool {
+	return isFSMetaValid(m.Version, m.Format)
+}
+
+// Verifies if the backend format metadata is sane by validating
+// the version string and format style.
+func isFSMetaValid(version, format string) bool {
+	return ((version == fsMetaVersion || version == fsMetaVersion100) &&
+		format == fsMetaFormat)
+}
+
 // Converts metadata to object info.
 func (m fsMetaV1) ToObjectInfo(bucket, object string, fi os.FileInfo) ObjectInfo {
 	if len(m.Meta) == 0 {
@@ -75,17 +104,15 @@ func (m fsMetaV1) ToObjectInfo(bucket, object string, fi os.FileInfo) ObjectInfo
 		objInfo.IsDir = fi.IsDir()
 	}
 
-	objInfo.MD5Sum = m.Meta["md5Sum"]
+	// Extract etag from metadata.
+	objInfo.ETag = extractETag(m.Meta)
 	objInfo.ContentType = m.Meta["content-type"]
 	objInfo.ContentEncoding = m.Meta["content-encoding"]
 
-	// md5Sum has already been extracted into objInfo.MD5Sum.  We
-	// need to remove it from m.Meta to avoid it from appearing as
-	// part of response headers. e.g, X-Minio-* or X-Amz-*.
-	delete(m.Meta, "md5Sum")
-
-	// Save all the other userdefined API.
-	objInfo.UserDefined = m.Meta
+	// etag/md5Sum has already been extracted. We need to
+	// remove to avoid it from appearing as part of
+	// response headers. e.g, X-Minio-* or X-Amz-*.
+	objInfo.UserDefined = cleanMetaETag(m.Meta)
 
 	// Success..
 	return objInfo
@@ -204,6 +231,12 @@ func (m *fsMetaV1) ReadFrom(lk *lock.LockedFile) (n int64, err error) {
 	// obtain format.
 	m.Format = parseFSFormat(fsMetaBuf)
 
+	// Verify if the format is valid, return corrupted format
+	// for unrecognized formats.
+	if !isFSMetaValid(m.Version, m.Format) {
+		return 0, traceError(errCorruptedFormat)
+	}
+
 	// obtain metadata.
 	m.Meta = parseFSMetaMap(fsMetaBuf)
 
@@ -217,17 +250,6 @@ func (m *fsMetaV1) ReadFrom(lk *lock.LockedFile) (n int64, err error) {
 	return int64(len(fsMetaBuf)), nil
 }
 
-// FS metadata constants.
-const (
-	// FS backend meta version.
-	fsMetaVersion = "1.0.0"
-
-	// FS backend meta format.
-	fsMetaFormat = "fs"
-
-	// Add more constants here.
-)
-
 // newFSMetaV1 - initializes new fsMetaV1.
 func newFSMetaV1() (fsMeta fsMetaV1) {
 	fsMeta = fsMetaV1{}
@@ -237,60 +259,97 @@ func newFSMetaV1() (fsMeta fsMetaV1) {
 	return fsMeta
 }
 
-// newFSFormatV1 - initializes new formatConfigV1 with FS format info.
-func newFSFormatV1() (format *formatConfigV1) {
-	return &formatConfigV1{
-		Version: "1",
-		Format:  "fs",
-		FS: &fsFormat{
-			Version: "1",
-		},
-	}
-}
+// Check if disk has already a valid format, holds a read lock and
+// upon success returns it to the caller to be closed.
+func checkLockedValidFormatFS(fsPath string) (*lock.RLockedFile, error) {
+	fsFormatPath := pathJoin(fsPath, minioMetaBucket, formatConfigFile)
 
-// loads format.json from minioMetaBucket if it exists.
-func loadFormatFS(fsPath string) (*formatConfigV1, error) {
-	rlk, err := lock.RLockedOpenFile(pathJoin(fsPath, minioMetaBucket, fsFormatJSONFile))
+	rlk, err := lock.RLockedOpenFile(preparePath(fsFormatPath))
 	if err != nil {
 		if os.IsNotExist(err) {
-			return nil, errUnformattedDisk
+			// If format.json not found then
+			// its an unformatted disk.
+			return nil, traceError(errUnformattedDisk)
 		}
-		return nil, err
+		return nil, traceError(err)
 	}
-	defer rlk.Close()
 
-	formatBytes, err := ioutil.ReadAll(rlk)
-	if err != nil {
+	var format = &formatConfigV1{}
+	if err = format.LoadFormat(rlk.LockedFile); err != nil {
+		rlk.Close()
 		return nil, err
 	}
 
-	format := &formatConfigV1{}
-	if err = json.Unmarshal(formatBytes, format); err != nil {
+	// Check format FS.
+	if err = format.CheckFS(); err != nil {
+		rlk.Close()
 		return nil, err
 	}
 
-	return format, nil
+	//  Always return read lock here and should be closed by the caller.
+	return rlk, traceError(err)
 }
 
-// writes FS format (format.json) into minioMetaBucket.
-func saveFormatFS(formatPath string, fsFormat *formatConfigV1) error {
-	metadataBytes, err := json.Marshal(fsFormat)
-	if err != nil {
-		return err
-	}
+// Creates a new format.json if unformatted.
+func createFormatFS(fsPath string) error {
+	fsFormatPath := pathJoin(fsPath, minioMetaBucket, formatConfigFile)
 
-	// fsFormatJSONFile - format.json file stored in minioMetaBucket(.minio.sys) directory.
-	lk, err := lock.LockedOpenFile(preparePath(formatPath), os.O_CREATE|os.O_WRONLY, 0600)
+	// Attempt a write lock on formatConfigFile `format.json`
+	// file stored in minioMetaBucket(.minio.sys) directory.
+	lk, err := lock.TryLockedOpenFile(preparePath(fsFormatPath), os.O_RDWR|os.O_CREATE, 0600)
 	if err != nil {
-		return err
+		return traceError(err)
 	}
+	// Close the locked file upon return.
 	defer lk.Close()
 
-	_, err = lk.Write(metadataBytes)
-	// Success.
+	// Load format on disk, checks if we are unformatted
+	// writes the new format.json
+	var format = &formatConfigV1{}
+	err = format.LoadFormat(lk)
+	if errorCause(err) == errUnformattedDisk {
+		_, err = newFSFormat().WriteTo(lk)
+		return err
+	}
 	return err
 }
 
+func initFormatFS(fsPath string) (rlk *lock.RLockedFile, err error) {
+	// This loop validates format.json by holding a read lock and
+	// proceeds if disk unformatted to hold non-blocking WriteLock
+	// If for some reason non-blocking WriteLock fails and the error
+	// is lock.ErrAlreadyLocked i.e some other process is holding a
+	// lock we retry in the loop again.
+	for {
+		// Validate the `format.json` for expected values.
+		rlk, err = checkLockedValidFormatFS(fsPath)
+		switch {
+		case err == nil:
+			// Holding a read lock ensures that any write lock operation
+			// is blocked if attempted in-turn avoiding corruption on
+			// the backend disk.
+			return rlk, nil
+		case errorCause(err) == errUnformattedDisk:
+			if err = createFormatFS(fsPath); err != nil {
+				// Existing write locks detected.
+				if errorCause(err) == lock.ErrAlreadyLocked {
+					// Lock already present, sleep and attempt again.
+					time.Sleep(100 * time.Millisecond)
+					continue
+				}
+
+				// Unexpected error, return.
+				return nil, err
+			}
+
+			// Loop will continue to attempt a read-lock on `format.json`.
+		default:
+			// Unhandled error return.
+			return nil, err
+		}
+	}
+}
+
 // Return if the part info in uploadedParts and completeParts are same.
 func isPartsSame(uploadedParts []objectPartInfo, completeParts []completePart) bool {
 	if len(uploadedParts) != len(completeParts) {

cmd/fs-v1-metadata_test.go

@@ -48,7 +48,7 @@ func TestReadFSMetadata(t *testing.T) {
 	bucketName := "bucket"
 	objectName := "object"
 
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Unexpected err: ", err)
 	}
 	sha256sum := ""
@@ -58,7 +58,7 @@ func TestReadFSMetadata(t *testing.T) {
 	}
 
 	// Construct the full path of fs.json
-	fsPath := pathJoin("buckets", bucketName, objectName, "fs.json")
+	fsPath := pathJoin(bucketMetaPrefix, bucketName, objectName, "fs.json")
 	fsPath = pathJoin(fs.fsPath, minioMetaBucket, fsPath)
 
 	rlk, err := fs.rwPool.Open(fsPath)
@@ -85,7 +85,7 @@ func TestWriteFSMetadata(t *testing.T) {
 	bucketName := "bucket"
 	objectName := "object"
 
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Unexpected err: ", err)
 	}
 	sha256sum := ""
@@ -95,7 +95,7 @@ func TestWriteFSMetadata(t *testing.T) {
 	}
 
 	// Construct the full path of fs.json
-	fsPath := pathJoin("buckets", bucketName, objectName, "fs.json")
+	fsPath := pathJoin(bucketMetaPrefix, bucketName, objectName, "fs.json")
 	fsPath = pathJoin(fs.fsPath, minioMetaBucket, fsPath)
 
 	rlk, err := fs.rwPool.Open(fsPath)
@@ -110,10 +110,10 @@ func TestWriteFSMetadata(t *testing.T) {
 	if err != nil {
 		t.Fatal("Unexpected error ", err)
 	}
-	if fsMeta.Version != "1.0.0" {
+	if fsMeta.Version != fsMetaVersion {
 		t.Fatalf("Unexpected version %s", fsMeta.Version)
 	}
-	if fsMeta.Format != "fs" {
+	if fsMeta.Format != fsMetaFormat {
 		t.Fatalf("Unexpected format %s", fsMeta.Format)
 	}
 }

cmd/fs-v1-multipart.go

@@ -706,6 +706,11 @@ func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, upload
 		return ObjectInfo{}, err
 	}
 
+	// Check if an object is present as one of the parent dir.
+	if fs.parentDirIsObject(bucket, pathutil.Dir(object)) {
+		return ObjectInfo{}, toObjectErr(traceError(errFileAccessDenied), bucket, object)
+	}
+
 	if _, err := fs.statBucketDir(bucket); err != nil {
 		return ObjectInfo{}, toObjectErr(err, bucket)
 	}
@@ -866,7 +871,7 @@ func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, upload
 	if len(fsMeta.Meta) == 0 {
 		fsMeta.Meta = make(map[string]string)
 	}
-	fsMeta.Meta["md5Sum"] = s3MD5
+	fsMeta.Meta["etag"] = s3MD5
 
 	// Write all the set metadata.
 	if _, err = fsMeta.WriteTo(metaFile); err != nil {

cmd/fs-v1-multipart_test.go

@@ -33,7 +33,7 @@ func TestFSWriteUploadJSON(t *testing.T) {
 	bucketName := "bucket"
 	objectName := "object"
 
-	obj.MakeBucket(bucketName)
+	obj.MakeBucketWithLocation(bucketName, "")
 	_, err := obj.NewMultipartUpload(bucketName, objectName, nil)
 	if err != nil {
 		t.Fatal("Unexpected err: ", err)
@@ -60,7 +60,7 @@ func TestNewMultipartUploadFaultyDisk(t *testing.T) {
 	bucketName := "bucket"
 	objectName := "object"
 
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Cannot create bucket, err: ", err)
 	}
 
@@ -91,7 +91,7 @@ func TestPutObjectPartFaultyDisk(t *testing.T) {
 	data := []byte("12345")
 	dataLen := int64(len(data))
 
-	if err = obj.MakeBucket(bucketName); err != nil {
+	if err = obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Cannot create bucket, err: ", err)
 	}
 
@@ -122,7 +122,7 @@ func TestCompleteMultipartUploadFaultyDisk(t *testing.T) {
 	objectName := "object"
 	data := []byte("12345")
 
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Cannot create bucket, err: ", err)
 	}
 
@@ -161,7 +161,7 @@ func TestListMultipartUploadsFaultyDisk(t *testing.T) {
 	objectName := "object"
 	data := []byte("12345")
 
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Cannot create bucket, err: ", err)
 	}
 

cmd/fs-v1.go

@@ -24,6 +24,7 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"path"
 	"path/filepath"
 	"sort"
 	"syscall"
@@ -41,6 +42,9 @@ type fsObjects struct {
 	// temporary transactions.
 	fsUUID string
 
+	// This value shouldn't be touched, once initialized.
+	fsFormatRlk *lock.RLockedFile // Is a read lock on `format.json`.
+
 	// FS rw pool.
 	rwPool *fsIOPool
 
@@ -108,24 +112,10 @@ func newFSObjectLayer(fsPath string) (ObjectLayer, error) {
 		return nil, fmt.Errorf("Unable to initialize '.minio.sys' meta volume, %s", err)
 	}
 
-	// Load `format.json`.
-	format, err := loadFormatFS(fsPath)
-	if err != nil && err != errUnformattedDisk {
-		return nil, fmt.Errorf("Unable to load 'format.json', %s", err)
-	}
-
-	// If the `format.json` doesn't exist create one.
-	if err == errUnformattedDisk {
-		fsFormatPath := pathJoin(fsPath, minioMetaBucket, fsFormatJSONFile)
-		// Initialize format.json, if already exists overwrite it.
-		if serr := saveFormatFS(fsFormatPath, newFSFormatV1()); serr != nil {
-			return nil, fmt.Errorf("Unable to initialize 'format.json', %s", serr)
-		}
-	}
-
-	// Validate if we have the same format.
-	if err == nil && format.Format != "fs" {
-		return nil, fmt.Errorf("Unable to recognize backend format, Disk is not in FS format. %s", format.Format)
+	// Initialize `format.json`, this function also returns.
+	rlk, err := initFormatFS(fsPath)
+	if err != nil {
+		return nil, err
 	}
 
 	// Initialize fs objects.
@@ -141,6 +131,12 @@ func newFSObjectLayer(fsPath string) (ObjectLayer, error) {
 		},
 	}
 
+	// Once the filesystem has initialized hold the read lock for
+	// the life time of the server. This is done to ensure that under
+	// shared backend mode for FS, remote servers do not migrate
+	// or cause changes on backend format.
+	fs.fsFormatRlk = rlk
+
 	// Initialize and load bucket policies.
 	err = initBucketPolicies(fs)
 	if err != nil {
@@ -204,7 +200,7 @@ func (fs fsObjects) statBucketDir(bucket string) (os.FileInfo, error) {
 
 // MakeBucket - create a new bucket, returns if it
 // already exists.
-func (fs fsObjects) MakeBucket(bucket string) error {
+func (fs fsObjects) MakeBucketWithLocation(bucket, location string) error {
 	bucketDir, err := fs.getBucketDir(bucket)
 	if err != nil {
 		return toObjectErr(err, bucket)
@@ -471,12 +467,6 @@ func (fs fsObjects) getObjectInfo(bucket, object string) (ObjectInfo, error) {
 
 // GetObjectInfo - reads object metadata and replies back ObjectInfo.
 func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
-	// This is a special case with object whose name ends with
-	// a slash separator, we always return object not found here.
-	if hasSuffix(object, slashSeparator) {
-		return ObjectInfo{}, toObjectErr(traceError(errFileNotFound), bucket, object)
-	}
-
 	if err := checkGetObjArgs(bucket, object); err != nil {
 		return ObjectInfo{}, err
 	}
@@ -488,6 +478,25 @@ func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
 	return fs.getObjectInfo(bucket, object)
 }
 
+// This function does the following check, suppose
+// object is "a/b/c/d", stat makes sure that objects ""a/b/c""
+// "a/b" and "a" do not exist.
+func (fs fsObjects) parentDirIsObject(bucket, parent string) bool {
+	var isParentDirObject func(string) bool
+	isParentDirObject = func(p string) bool {
+		if p == "." {
+			return false
+		}
+		if _, err := fsStatFile(pathJoin(fs.fsPath, bucket, p)); err == nil {
+			// If there is already a file at prefix "p" return error.
+			return true
+		}
+		// Check if there is a file as one of the parent paths.
+		return isParentDirObject(path.Dir(p))
+	}
+	return isParentDirObject(parent)
+}
+
 // PutObject - creates an object upon reading from the input stream
 // until EOF, writes data directly to configured filesystem path.
 // Additionally writes `fs.json` which carries the necessary metadata
@@ -495,18 +504,29 @@ func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
 func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, retErr error) {
 	var err error
 
-	// This is a special case with size as '0' and object ends with
-	// a slash separator, we treat it like a valid operation and
-	// return success.
+	// Validate if bucket name is valid and exists.
+	if _, err = fs.statBucketDir(bucket); err != nil {
+		return ObjectInfo{}, toObjectErr(err, bucket)
+	}
+
+	// This is a special case with size as '0' and object ends
+	// with a slash separator, we treat it like a valid operation
+	// and return success.
 	if isObjectDir(object, size) {
+		// Check if an object is present as one of the parent dir.
+		if fs.parentDirIsObject(bucket, path.Dir(object)) {
+			return ObjectInfo{}, toObjectErr(traceError(errFileAccessDenied), bucket, object)
+		}
 		return dirObjectInfo(bucket, object, size, metadata), nil
 	}
+
 	if err = checkPutObjectArgs(bucket, object, fs); err != nil {
 		return ObjectInfo{}, err
 	}
 
-	if _, err = fs.statBucketDir(bucket); err != nil {
-		return ObjectInfo{}, toObjectErr(err, bucket)
+	// Check if an object is present as one of the parent dir.
+	if fs.parentDirIsObject(bucket, path.Dir(object)) {
+		return ObjectInfo{}, toObjectErr(traceError(errFileAccessDenied), bucket, object)
 	}
 
 	// No metadata is set, allocate a new one.
@@ -592,12 +612,12 @@ func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.
 
 	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
+	if len(metadata["etag"]) == 0 {
+		metadata["etag"] = newMD5Hex
 	}
 
 	// md5Hex representation.
-	md5Hex := metadata["md5Sum"]
+	md5Hex := metadata["etag"]
 	if md5Hex != "" {
 		if newMD5Hex != md5Hex {
 			// Returns md5 mismatch.
@@ -729,8 +749,12 @@ func (fs fsObjects) getObjectETag(bucket, entry string) (string, error) {
 		}
 	}
 
-	fsMetaMap := parseFSMetaMap(fsMetaBuf)
-	return fsMetaMap["md5Sum"], nil
+	// Check if FS metadata is valid, if not return error.
+	if !isFSMetaValid(parseFSVersion(fsMetaBuf), parseFSFormat(fsMetaBuf)) {
+		return "", toObjectErr(traceError(errCorruptedFormat), bucket, entry)
+	}
+
+	return extractETag(parseFSMetaMap(fsMetaBuf)), nil
 }
 
 // ListObjects - list all objects at prefix upto maxKeys., optionally delimited by '/'. Maintains the list pool
@@ -781,8 +805,8 @@ func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKey
 		// Protect reading `fs.json`.
 		objectLock := globalNSMutex.NewNSLock(bucket, entry)
 		objectLock.RLock()
-		var md5Sum string
-		md5Sum, err = fs.getObjectETag(bucket, entry)
+		var etag string
+		etag, err = fs.getObjectETag(bucket, entry)
 		objectLock.RUnlock()
 		if err != nil {
 			return ObjectInfo{}, err
@@ -802,7 +826,7 @@ func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKey
 			Size:    fi.Size(),
 			ModTime: fi.ModTime(),
 			IsDir:   fi.IsDir(),
-			MD5Sum:  md5Sum,
+			ETag:    etag,
 		}, nil
 	}
 

cmd/fs-v1_test.go

@@ -63,7 +63,7 @@ func TestFSShutdown(t *testing.T) {
 		obj := initFSObjects(disk, t)
 		fs := obj.(*fsObjects)
 		objectContent := "12345"
-		obj.MakeBucket(bucketName)
+		obj.MakeBucketWithLocation(bucketName, "")
 		sha256sum := ""
 		obj.PutObject(bucketName, objectName, int64(len(objectContent)), bytes.NewReader([]byte(objectContent)), nil, sha256sum)
 		return fs, disk
@@ -85,47 +85,6 @@ func TestFSShutdown(t *testing.T) {
 	}
 }
 
-// TestFSLoadFormatFS - test loadFormatFS with healty and faulty disks
-func TestFSLoadFormatFS(t *testing.T) {
-	// Prepare for testing
-	disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())
-	defer removeAll(disk)
-
-	// Assign a new UUID.
-	uuid := mustGetUUID()
-
-	// Initialize meta volume, if volume already exists ignores it.
-	if err := initMetaVolumeFS(disk, uuid); err != nil {
-		t.Fatal(err)
-	}
-
-	fsFormatPath := pathJoin(disk, minioMetaBucket, fsFormatJSONFile)
-	if err := saveFormatFS(preparePath(fsFormatPath), newFSFormatV1()); err != nil {
-		t.Fatal("Should not fail here", err)
-	}
-	_, err := loadFormatFS(disk)
-	if err != nil {
-		t.Fatal("Should not fail here", err)
-	}
-	// Loading corrupted format file
-	file, err := os.OpenFile(preparePath(fsFormatPath), os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0666)
-	if err != nil {
-		t.Fatal("Should not fail here", err)
-	}
-	file.Write([]byte{'b'})
-	file.Close()
-	_, err = loadFormatFS(disk)
-	if err == nil {
-		t.Fatal("Should return an error here")
-	}
-	// Loading format file from disk not found.
-	removeAll(disk)
-	_, err = loadFormatFS(disk)
-	if err != nil && err != errUnformattedDisk {
-		t.Fatal("Should return unformatted disk, but got", err)
-	}
-}
-
 // TestFSGetBucketInfo - test GetBucketInfo with healty and faulty disks
 func TestFSGetBucketInfo(t *testing.T) {
 	// Prepare for testing
@@ -136,7 +95,7 @@ func TestFSGetBucketInfo(t *testing.T) {
 	fs := obj.(*fsObjects)
 	bucketName := "bucket"
 
-	obj.MakeBucket(bucketName)
+	obj.MakeBucketWithLocation(bucketName, "")
 
 	// Test with valid parameters
 	info, err := fs.GetBucketInfo(bucketName)
@@ -161,6 +120,74 @@ func TestFSGetBucketInfo(t *testing.T) {
 	}
 }
 
+func TestFSPutObject(t *testing.T) {
+	// Prepare for tests
+	disk := filepath.Join(globalTestTmpDir, "minio-"+nextSuffix())
+	defer removeAll(disk)
+
+	obj := initFSObjects(disk, t)
+	bucketName := "bucket"
+	objectName := "1/2/3/4/object"
+
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
+		t.Fatal(err)
+	}
+
+	sha256sum := ""
+
+	// With a regular object.
+	_, err := obj.PutObject(bucketName+"non-existent", objectName, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil, sha256sum)
+	if err == nil {
+		t.Fatal("Unexpected should fail here, bucket doesn't exist")
+	}
+	if _, ok := errorCause(err).(BucketNotFound); !ok {
+		t.Fatalf("Expected error type BucketNotFound, got %#v", err)
+	}
+
+	// With a directory object.
+	_, err = obj.PutObject(bucketName+"non-existent", objectName+"/", int64(0), bytes.NewReader([]byte("")), nil, sha256sum)
+	if err == nil {
+		t.Fatal("Unexpected should fail here, bucket doesn't exist")
+	}
+	if _, ok := errorCause(err).(BucketNotFound); !ok {
+		t.Fatalf("Expected error type BucketNotFound, got %#v", err)
+	}
+
+	_, err = obj.PutObject(bucketName, objectName, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil, sha256sum)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = obj.PutObject(bucketName, objectName+"/1", int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil, sha256sum)
+	if err == nil {
+		t.Fatal("Unexpected should fail here, backend corruption occurred")
+	}
+	if nerr, ok := errorCause(err).(PrefixAccessDenied); !ok {
+		t.Fatalf("Expected PrefixAccessDenied, got %#v", err)
+	} else {
+		if nerr.Bucket != "bucket" {
+			t.Fatalf("Expected 'bucket', got %s", nerr.Bucket)
+		}
+		if nerr.Object != "1/2/3/4/object/1" {
+			t.Fatalf("Expected '1/2/3/4/object/1', got %s", nerr.Object)
+		}
+	}
+
+	_, err = obj.PutObject(bucketName, objectName+"/1/", 0, bytes.NewReader([]byte("")), nil, sha256sum)
+	if err == nil {
+		t.Fatal("Unexpected should fail here, backned corruption occurred")
+	}
+	if nerr, ok := errorCause(err).(PrefixAccessDenied); !ok {
+		t.Fatalf("Expected PrefixAccessDenied, got %#v", err)
+	} else {
+		if nerr.Bucket != "bucket" {
+			t.Fatalf("Expected 'bucket', got %s", nerr.Bucket)
+		}
+		if nerr.Object != "1/2/3/4/object/1/" {
+			t.Fatalf("Expected '1/2/3/4/object/1/', got %s", nerr.Object)
+		}
+	}
+}
+
 // TestFSDeleteObject - test fs.DeleteObject() with healthy and corrupted disks
 func TestFSDeleteObject(t *testing.T) {
 	// Prepare for tests
@@ -172,7 +199,7 @@ func TestFSDeleteObject(t *testing.T) {
 	bucketName := "bucket"
 	objectName := "object"
 
-	obj.MakeBucket(bucketName)
+	obj.MakeBucketWithLocation(bucketName, "")
 	sha256sum := ""
 	obj.PutObject(bucketName, objectName, int64(len("abcd")), bytes.NewReader([]byte("abcd")), nil, sha256sum)
 
@@ -217,7 +244,7 @@ func TestFSDeleteBucket(t *testing.T) {
 	fs := obj.(*fsObjects)
 	bucketName := "bucket"
 
-	err := obj.MakeBucket(bucketName)
+	err := obj.MakeBucketWithLocation(bucketName, "")
 	if err != nil {
 		t.Fatal("Unexpected error: ", err)
 	}
@@ -235,7 +262,7 @@ func TestFSDeleteBucket(t *testing.T) {
 		t.Fatal("Unexpected error: ", err)
 	}
 
-	obj.MakeBucket(bucketName)
+	obj.MakeBucketWithLocation(bucketName, "")
 
 	// Delete bucker should get error disk not found.
 	removeAll(disk)
@@ -256,7 +283,7 @@ func TestFSListBuckets(t *testing.T) {
 	fs := obj.(*fsObjects)
 
 	bucketName := "bucket"
-	if err := obj.MakeBucket(bucketName); err != nil {
+	if err := obj.MakeBucketWithLocation(bucketName, ""); err != nil {
 		t.Fatal("Unexpected error: ", err)
 	}
 

cmd/gateway-azure-anonymous.go

@@ -30,7 +30,7 @@ import (
 )
 
 // AnonGetBucketInfo - Get bucket metadata from azure anonymously.
-func (a AzureObjects) AnonGetBucketInfo(bucket string) (bucketInfo BucketInfo, err error) {
+func (a *azureObjects) AnonGetBucketInfo(bucket string) (bucketInfo BucketInfo, err error) {
 	url, err := url.Parse(a.client.GetBlobURL(bucket, ""))
 	if err != nil {
 		return bucketInfo, azureToObjectError(traceError(err))
@@ -40,7 +40,7 @@ func (a AzureObjects) AnonGetBucketInfo(bucket string) (bucketInfo BucketInfo, e
 	if err != nil {
 		return bucketInfo, azureToObjectError(traceError(err), bucket)
 	}
-	defer resp.Body.Close()
+	resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
 		return bucketInfo, azureToObjectError(traceError(anonErrToObjectErr(resp.StatusCode, bucket)), bucket)
@@ -57,9 +57,16 @@ func (a AzureObjects) AnonGetBucketInfo(bucket string) (bucketInfo BucketInfo, e
 	return bucketInfo, nil
 }
 
+// AnonPutObject - SendPUT request without authentication.
+// This is needed when clients send PUT requests on objects that can be uploaded without auth.
+func (a *azureObjects) AnonPutObject(bucket, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, err error) {
+	// azure doesn't support anonymous put
+	return ObjectInfo{}, traceError(NotImplemented{})
+}
+
 // AnonGetObject - SendGET request without authentication.
 // This is needed when clients send GET requests on objects that can be downloaded without auth.
-func (a AzureObjects) AnonGetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) (err error) {
+func (a *azureObjects) AnonGetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) (err error) {
 	u := a.client.GetBlobURL(bucket, object)
 	req, err := http.NewRequest("GET", u, nil)
 	if err != nil {
@@ -88,12 +95,12 @@ func (a AzureObjects) AnonGetObject(bucket, object string, startOffset int64, le
 
 // AnonGetObjectInfo - Send HEAD request without authentication and convert the
 // result to ObjectInfo.
-func (a AzureObjects) AnonGetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error) {
+func (a *azureObjects) AnonGetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error) {
 	resp, err := http.Head(a.client.GetBlobURL(bucket, object))
 	if err != nil {
 		return objInfo, azureToObjectError(traceError(err), bucket, object)
 	}
-	defer resp.Body.Close()
+	resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
 		return objInfo, azureToObjectError(traceError(anonErrToObjectErr(resp.StatusCode, bucket, object)), bucket, object)
@@ -120,7 +127,7 @@ func (a AzureObjects) AnonGetObjectInfo(bucket, object string) (objInfo ObjectIn
 		objInfo.UserDefined["Content-Encoding"] = resp.Header.Get("Content-Encoding")
 	}
 	objInfo.UserDefined["Content-Type"] = resp.Header.Get("Content-Type")
-	objInfo.MD5Sum = resp.Header.Get("Etag")
+	objInfo.ETag = resp.Header.Get("Etag")
 	objInfo.ModTime = t
 	objInfo.Name = object
 	objInfo.Size = contentLength
@@ -128,7 +135,7 @@ func (a AzureObjects) AnonGetObjectInfo(bucket, object string) (objInfo ObjectIn
 }
 
 // AnonListObjects - Use Azure equivalent ListBlobs.
-func (a AzureObjects) AnonListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error) {
+func (a *azureObjects) AnonListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error) {
 	params := storage.ListBlobsParameters{
 		Prefix:     prefix,
 		Marker:     marker,
@@ -175,7 +182,7 @@ func (a AzureObjects) AnonListObjects(bucket, prefix, marker, delimiter string,
 			Name:            object.Name,
 			ModTime:         t,
 			Size:            object.Properties.ContentLength,
-			MD5Sum:          object.Properties.Etag,
+			ETag:            object.Properties.Etag,
 			ContentType:     object.Properties.ContentType,
 			ContentEncoding: object.Properties.ContentEncoding,
 		})

cmd/gateway-azure-unsupported.go

@@ -17,27 +17,27 @@
 package cmd
 
 // HealBucket - Not relevant.
-func (a AzureObjects) HealBucket(bucket string) error {
+func (a *azureObjects) HealBucket(bucket string) error {
 	return traceError(NotImplemented{})
 }
 
 // ListBucketsHeal - Not relevant.
-func (a AzureObjects) ListBucketsHeal() (buckets []BucketInfo, err error) {
+func (a *azureObjects) ListBucketsHeal() (buckets []BucketInfo, err error) {
 	return nil, traceError(NotImplemented{})
 }
 
 // HealObject - Not relevant.
-func (a AzureObjects) HealObject(bucket, object string) (int, int, error) {
+func (a *azureObjects) HealObject(bucket, object string) (int, int, error) {
 	return 0, 0, traceError(NotImplemented{})
 }
 
 // ListObjectsHeal - Not relevant.
-func (a AzureObjects) ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
+func (a *azureObjects) ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
 	return ListObjectsInfo{}, traceError(NotImplemented{})
 }
 
 // ListUploadsHeal - Not relevant.
-func (a AzureObjects) ListUploadsHeal(bucket, prefix, marker, uploadIDMarker,
+func (a *azureObjects) ListUploadsHeal(bucket, prefix, marker, uploadIDMarker,
 	delimiter string, maxUploads int) (ListMultipartsInfo, error) {
 	return ListMultipartsInfo{}, traceError(NotImplemented{})
 }

cmd/gateway-azure.go

@@ -17,6 +17,7 @@
 package cmd
 
 import (
+	"crypto/md5"
 	"encoding/base64"
 	"encoding/hex"
 	"fmt"
@@ -36,6 +37,36 @@ import (
 
 const globalAzureAPIVersion = "2016-05-31"
 
+// Canonicalize the metadata headers, without this azure-sdk calculates
+// incorrect signature. This attempt to canonicalize is to convert
+// any HTTP header which is of form say `accept-encoding` should be
+// converted to `Accept-Encoding` in its canonical form.
+// Also replaces X-Amz-Meta prefix with X-Ms-Meta as Azure expects user
+// defined metadata to have X-Ms-Meta prefix.
+func s3ToAzureHeaders(headers map[string]string) (newHeaders map[string]string) {
+	newHeaders = make(map[string]string)
+	for k, v := range headers {
+		k = http.CanonicalHeaderKey(k)
+		if strings.HasPrefix(k, "X-Amz-Meta") {
+			k = strings.Replace(k, "X-Amz-Meta", "X-Ms-Meta", -1)
+		}
+		newHeaders[k] = v
+	}
+	return newHeaders
+}
+
+// Prefix user metadata with "X-Amz-Meta-".
+// client.GetBlobMetadata() already strips "X-Ms-Meta-"
+func azureToS3Metadata(meta map[string]string) (newMeta map[string]string) {
+	newMeta = make(map[string]string)
+
+	for k, v := range meta {
+		k = "X-Amz-Meta-" + k
+		newMeta[k] = v
+	}
+	return newMeta
+}
+
 // To store metadata during NewMultipartUpload which will be used after
 // CompleteMultipartUpload to call SetBlobMetadata.
 type azureMultipartMetaInfo struct {
@@ -64,8 +95,8 @@ func (a *azureMultipartMetaInfo) del(key string) {
 	delete(a.meta, key)
 }
 
-// AzureObjects - Implements Object layer for Azure blob storage.
-type AzureObjects struct {
+// azureObjects - Implements Object layer for Azure blob storage.
+type azureObjects struct {
 	client   storage.BlobStorageClient // Azure sdk client
 	metaInfo azureMultipartMetaInfo
 }
@@ -122,16 +153,16 @@ func azureToObjectError(err error, params ...string) error {
 	return e
 }
 
-// Inits azure blob storage client and returns AzureObjects.
+// Inits azure blob storage client and returns azureObjects.
 func newAzureLayer(endPoint string, account, key string, secure bool) (GatewayLayer, error) {
 	if endPoint == "" {
 		endPoint = storage.DefaultBaseURL
 	}
 	c, err := storage.NewClient(account, key, endPoint, globalAzureAPIVersion, secure)
 	if err != nil {
-		return AzureObjects{}, err
+		return &azureObjects{}, err
 	}
-	return &AzureObjects{
+	return &azureObjects{
 		client: c.GetBlobService(),
 		metaInfo: azureMultipartMetaInfo{
 			meta:  make(map[string]map[string]string),
@@ -142,30 +173,24 @@ func newAzureLayer(endPoint string, account, key string, secure bool) (GatewayLa
 
 // Shutdown - save any gateway metadata to disk
 // if necessary and reload upon next restart.
-func (a AzureObjects) Shutdown() error {
+func (a *azureObjects) Shutdown() error {
 	// TODO
 	return nil
 }
 
 // StorageInfo - Not relevant to Azure backend.
-func (a AzureObjects) StorageInfo() StorageInfo {
+func (a *azureObjects) StorageInfo() StorageInfo {
 	return StorageInfo{}
 }
 
-// MakeBucket - Create a new container on azure backend.
-func (a AzureObjects) MakeBucket(bucket string) error {
-	// will never be called, only satisfy ObjectLayer interface
-	return traceError(NotImplemented{})
-}
-
 // MakeBucketWithLocation - Create a new container on azure backend.
-func (a AzureObjects) MakeBucketWithLocation(bucket, location string) error {
+func (a *azureObjects) MakeBucketWithLocation(bucket, location string) error {
 	err := a.client.CreateContainer(bucket, storage.ContainerAccessTypePrivate)
 	return azureToObjectError(traceError(err), bucket)
 }
 
 // GetBucketInfo - Get bucket metadata..
-func (a AzureObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
+func (a *azureObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
 	// Azure does not have an equivalent call, hence use ListContainers.
 	resp, err := a.client.ListContainers(storage.ListContainersParameters{
 		Prefix: bucket,
@@ -188,7 +213,7 @@ func (a AzureObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
 }
 
 // ListBuckets - Lists all azure containers, uses Azure equivalent ListContainers.
-func (a AzureObjects) ListBuckets() (buckets []BucketInfo, err error) {
+func (a *azureObjects) ListBuckets() (buckets []BucketInfo, err error) {
 	resp, err := a.client.ListContainers(storage.ListContainersParameters{})
 	if err != nil {
 		return nil, azureToObjectError(traceError(err))
@@ -207,13 +232,13 @@ func (a AzureObjects) ListBuckets() (buckets []BucketInfo, err error) {
 }
 
 // DeleteBucket - delete a container on azure, uses Azure equivalent DeleteContainer.
-func (a AzureObjects) DeleteBucket(bucket string) error {
+func (a *azureObjects) DeleteBucket(bucket string) error {
 	return azureToObjectError(traceError(a.client.DeleteContainer(bucket)), bucket)
 }
 
 // ListObjects - lists all blobs on azure with in a container filtered by prefix
 // and marker, uses Azure equivalent ListBlobs.
-func (a AzureObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error) {
+func (a *azureObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error) {
 	resp, err := a.client.ListBlobs(bucket, storage.ListBlobsParameters{
 		Prefix:     prefix,
 		Marker:     marker,
@@ -235,7 +260,7 @@ func (a AzureObjects) ListObjects(bucket, prefix, marker, delimiter string, maxK
 			Name:            object.Name,
 			ModTime:         t,
 			Size:            object.Properties.ContentLength,
-			MD5Sum:          canonicalizeETag(object.Properties.Etag),
+			ETag:            canonicalizeETag(object.Properties.Etag),
 			ContentType:     object.Properties.ContentType,
 			ContentEncoding: object.Properties.ContentEncoding,
 		})
@@ -250,7 +275,7 @@ func (a AzureObjects) ListObjects(bucket, prefix, marker, delimiter string, maxK
 //
 // startOffset indicates the starting read location of the object.
 // length indicates the total length of the object.
-func (a AzureObjects) GetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) error {
+func (a *azureObjects) GetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) error {
 	byteRange := fmt.Sprintf("%d-", startOffset)
 	if length > 0 && startOffset > 0 {
 		byteRange = fmt.Sprintf("%d-%d", startOffset, startOffset+length-1)
@@ -273,7 +298,14 @@ func (a AzureObjects) GetObject(bucket, object string, startOffset int64, length
 
 // GetObjectInfo - reads blob metadata properties and replies back ObjectInfo,
 // uses zure equivalent GetBlobProperties.
-func (a AzureObjects) GetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error) {
+func (a *azureObjects) GetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error) {
+	blobMeta, err := a.client.GetBlobMetadata(bucket, object)
+	if err != nil {
+		return objInfo, azureToObjectError(traceError(err), bucket, object)
+	}
+
+	meta := azureToS3Metadata(blobMeta)
+
 	prop, err := a.client.GetBlobProperties(bucket, object)
 	if err != nil {
 		return objInfo, azureToObjectError(traceError(err), bucket, object)
@@ -282,55 +314,69 @@ func (a AzureObjects) GetObjectInfo(bucket, object string) (objInfo ObjectInfo,
 	if err != nil {
 		return objInfo, traceError(err)
 	}
+
+	if prop.ContentEncoding != "" {
+		meta["Content-Encoding"] = prop.ContentEncoding
+	}
+	meta["Content-Type"] = prop.ContentType
+
 	objInfo = ObjectInfo{
 		Bucket:      bucket,
-		UserDefined: make(map[string]string),
-		MD5Sum:      canonicalizeETag(prop.Etag),
+		UserDefined: meta,
+		ETag:        canonicalizeETag(prop.Etag),
 		ModTime:     t,
 		Name:        object,
 		Size:        prop.ContentLength,
 	}
-	if prop.ContentEncoding != "" {
-		objInfo.UserDefined["Content-Encoding"] = prop.ContentEncoding
-	}
-	objInfo.UserDefined["Content-Type"] = prop.ContentType
-	return objInfo, nil
-}
 
-// Canonicalize the metadata headers, without this azure-sdk calculates
-// incorrect signature. This attempt to canonicalize is to convert
-// any HTTP header which is of form say `accept-encoding` should be
-// converted to `Accept-Encoding` in its canonical form.
-func canonicalMetadata(metadata map[string]string) (canonical map[string]string) {
-	canonical = make(map[string]string)
-	for k, v := range metadata {
-		canonical[http.CanonicalHeaderKey(k)] = v
-	}
-	return canonical
+	return objInfo, nil
 }
 
 // PutObject - Create a new blob with the incoming data,
 // uses Azure equivalent CreateBlockBlobFromReader.
-func (a AzureObjects) PutObject(bucket, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, err error) {
+func (a *azureObjects) PutObject(bucket, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, err error) {
 	var sha256Writer hash.Hash
+	var md5sumWriter hash.Hash
+
+	var writers []io.Writer
+
+	md5sum := metadata["etag"]
+	delete(metadata, "etag")
+
 	teeReader := data
+
 	if sha256sum != "" {
 		sha256Writer = sha256.New()
-		teeReader = io.TeeReader(data, sha256Writer)
+		writers = append(writers, sha256Writer)
 	}
 
-	delete(metadata, "md5Sum")
+	if md5sum != "" {
+		md5sumWriter = md5.New()
+		writers = append(writers, md5sumWriter)
+	}
 
-	err = a.client.CreateBlockBlobFromReader(bucket, object, uint64(size), teeReader, canonicalMetadata(metadata))
+	if len(writers) > 0 {
+		teeReader = io.TeeReader(data, io.MultiWriter(writers...))
+	}
+
+	err = a.client.CreateBlockBlobFromReader(bucket, object, uint64(size), teeReader, s3ToAzureHeaders(metadata))
 	if err != nil {
 		return objInfo, azureToObjectError(traceError(err), bucket, object)
 	}
 
+	if md5sum != "" {
+		newMD5sum := hex.EncodeToString(md5sumWriter.Sum(nil))
+		if newMD5sum != md5sum {
+			a.client.DeleteBlob(bucket, object, nil)
+			return ObjectInfo{}, azureToObjectError(traceError(BadDigest{md5sum, newMD5sum}))
+		}
+	}
+
 	if sha256sum != "" {
 		newSHA256sum := hex.EncodeToString(sha256Writer.Sum(nil))
 		if newSHA256sum != sha256sum {
 			a.client.DeleteBlob(bucket, object, nil)
-			return ObjectInfo{}, traceError(SHA256Mismatch{})
+			return ObjectInfo{}, azureToObjectError(traceError(SHA256Mismatch{}))
 		}
 	}
 
@@ -339,7 +385,7 @@ func (a AzureObjects) PutObject(bucket, object string, size int64, data io.Reade
 
 // CopyObject - Copies a blob from source container to destination container.
 // Uses Azure equivalent CopyBlob API.
-func (a AzureObjects) CopyObject(srcBucket, srcObject, destBucket, destObject string, metadata map[string]string) (objInfo ObjectInfo, err error) {
+func (a *azureObjects) CopyObject(srcBucket, srcObject, destBucket, destObject string, metadata map[string]string) (objInfo ObjectInfo, err error) {
 	err = a.client.CopyBlob(destBucket, destObject, a.client.GetBlobURL(srcBucket, srcObject))
 	if err != nil {
 		return objInfo, azureToObjectError(traceError(err), srcBucket, srcObject)
@@ -349,7 +395,7 @@ func (a AzureObjects) CopyObject(srcBucket, srcObject, destBucket, destObject st
 
 // DeleteObject - Deletes a blob on azure container, uses Azure
 // equivalent DeleteBlob API.
-func (a AzureObjects) DeleteObject(bucket, object string) error {
+func (a *azureObjects) DeleteObject(bucket, object string) error {
 	err := a.client.DeleteBlob(bucket, object, nil)
 	if err != nil {
 		return azureToObjectError(traceError(err), bucket, object)
@@ -361,7 +407,7 @@ func (a AzureObjects) DeleteObject(bucket, object string) error {
 // FIXME: Full ListMultipartUploads is not supported yet. It is supported just enough to help our client libs to
 // support re-uploads. a.client.ListBlobs() can be made to return entries which include uncommitted blobs using
 // which we need to filter out the committed blobs to get the list of uncommitted blobs.
-func (a AzureObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (result ListMultipartsInfo, err error) {
+func (a *azureObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (result ListMultipartsInfo, err error) {
 	result.MaxUploads = maxUploads
 	result.Prefix = prefix
 	result.Delimiter = delimiter
@@ -377,7 +423,7 @@ func (a AzureObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMa
 }
 
 // NewMultipartUpload - Use Azure equivalent CreateBlockBlob.
-func (a AzureObjects) NewMultipartUpload(bucket, object string, metadata map[string]string) (uploadID string, err error) {
+func (a *azureObjects) NewMultipartUpload(bucket, object string, metadata map[string]string) (uploadID string, err error) {
 	// Azure doesn't return a unique upload ID and we use object name in place of it. Azure allows multiple uploads to
 	// co-exist as long as the user keeps the blocks uploaded (in block blobs) unique amongst concurrent upload attempts.
 	// Each concurrent client, keeps its own blockID list which it can commit.
@@ -386,14 +432,14 @@ func (a AzureObjects) NewMultipartUpload(bucket, object string, metadata map[str
 		// Store an empty map as a placeholder else ListObjectParts/PutObjectPart will not work properly.
 		metadata = make(map[string]string)
 	} else {
-		metadata = canonicalMetadata(metadata)
+		metadata = s3ToAzureHeaders(metadata)
 	}
 	a.metaInfo.set(uploadID, metadata)
 	return uploadID, nil
 }
 
 // CopyObjectPart - Not implemented.
-func (a AzureObjects) CopyObjectPart(srcBucket, srcObject, destBucket, destObject string, uploadID string, partID int, startOffset int64, length int64) (info PartInfo, err error) {
+func (a *azureObjects) CopyObjectPart(srcBucket, srcObject, destBucket, destObject string, uploadID string, partID int, startOffset int64, length int64) (info PartInfo, err error) {
 	return info, traceError(NotImplemented{})
 }
 
@@ -421,39 +467,66 @@ func azureParseBlockID(blockID string) (int, string, error) {
 }
 
 // PutObjectPart - Use Azure equivalent PutBlockWithLength.
-func (a AzureObjects) PutObjectPart(bucket, object, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (info PartInfo, err error) {
+func (a *azureObjects) PutObjectPart(bucket, object, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (info PartInfo, err error) {
 	if meta := a.metaInfo.get(uploadID); meta == nil {
 		return info, traceError(InvalidUploadID{})
 	}
 	var sha256Writer hash.Hash
+	var md5sumWriter hash.Hash
+	var etag string
+
+	var writers []io.Writer
+
 	if sha256sum != "" {
 		sha256Writer = sha256.New()
+		writers = append(writers, sha256Writer)
 	}
 
-	teeReader := io.TeeReader(data, sha256Writer)
+	if md5Hex != "" {
+		md5sumWriter = md5.New()
+		writers = append(writers, md5sumWriter)
+		etag = md5Hex
+	} else {
+		// Generate random ETag.
+		etag = getMD5Hash([]byte(mustGetUUID()))
+	}
 
-	id := azureGetBlockID(partID, md5Hex)
+	teeReader := data
+
+	if len(writers) > 0 {
+		teeReader = io.TeeReader(data, io.MultiWriter(writers...))
+	}
+
+	id := azureGetBlockID(partID, etag)
 	err = a.client.PutBlockWithLength(bucket, object, id, uint64(size), teeReader, nil)
 	if err != nil {
 		return info, azureToObjectError(traceError(err), bucket, object)
 	}
 
+	if md5Hex != "" {
+		newMD5sum := hex.EncodeToString(md5sumWriter.Sum(nil))
+		if newMD5sum != md5Hex {
+			a.client.DeleteBlob(bucket, object, nil)
+			return PartInfo{}, azureToObjectError(traceError(BadDigest{md5Hex, newMD5sum}))
+		}
+	}
+
 	if sha256sum != "" {
 		newSHA256sum := hex.EncodeToString(sha256Writer.Sum(nil))
 		if newSHA256sum != sha256sum {
-			return PartInfo{}, traceError(SHA256Mismatch{})
+			return PartInfo{}, azureToObjectError(traceError(SHA256Mismatch{}))
 		}
 	}
 
 	info.PartNumber = partID
-	info.ETag = md5Hex
+	info.ETag = etag
 	info.LastModified = UTCNow()
 	info.Size = size
 	return info, nil
 }
 
 // ListObjectParts - Use Azure equivalent GetBlockList.
-func (a AzureObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker int, maxParts int) (result ListPartsInfo, err error) {
+func (a *azureObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker int, maxParts int) (result ListPartsInfo, err error) {
 	result.Bucket = bucket
 	result.Object = object
 	result.UploadID = uploadID
@@ -502,13 +575,13 @@ func (a AzureObjects) ListObjectParts(bucket, object, uploadID string, partNumbe
 // AbortMultipartUpload - Not Implemented.
 // There is no corresponding API in azure to abort an incomplete upload. The uncommmitted blocks
 // gets deleted after one week.
-func (a AzureObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
+func (a *azureObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
 	a.metaInfo.del(uploadID)
 	return nil
 }
 
 // CompleteMultipartUpload - Use Azure equivalent PutBlockList.
-func (a AzureObjects) CompleteMultipartUpload(bucket, object, uploadID string, uploadedParts []completePart) (objInfo ObjectInfo, err error) {
+func (a *azureObjects) CompleteMultipartUpload(bucket, object, uploadID string, uploadedParts []completePart) (objInfo ObjectInfo, err error) {
 	meta := a.metaInfo.get(uploadID)
 	if meta == nil {
 		return objInfo, traceError(InvalidUploadID{uploadID})
@@ -536,6 +609,10 @@ func (a AzureObjects) CompleteMultipartUpload(bucket, object, uploadID string, u
 		if err != nil {
 			return objInfo, azureToObjectError(traceError(err), bucket, object)
 		}
+		err = a.client.SetBlobMetadata(bucket, object, nil, meta)
+		if err != nil {
+			return objInfo, azureToObjectError(traceError(err), bucket, object)
+		}
 	}
 	a.metaInfo.del(uploadID)
 	return a.GetObjectInfo(bucket, object)
@@ -598,7 +675,7 @@ func azureListBlobsGetParameters(p storage.ListBlobsParameters) url.Values {
 // storage.ContainerAccessTypePrivate - none in minio terminology
 // As the common denominator for minio and azure is readonly and none, we support
 // these two policies at the bucket level.
-func (a AzureObjects) SetBucketPolicies(bucket string, policyInfo policy.BucketAccessPolicy) error {
+func (a *azureObjects) SetBucketPolicies(bucket string, policyInfo policy.BucketAccessPolicy) error {
 	var policies []BucketAccessPolicy
 
 	for prefix, policy := range policy.GetPolicies(policyInfo.Statements, bucket) {
@@ -626,7 +703,7 @@ func (a AzureObjects) SetBucketPolicies(bucket string, policyInfo policy.BucketA
 }
 
 // GetBucketPolicies - Get the container ACL and convert it to canonical []bucketAccessPolicy
-func (a AzureObjects) GetBucketPolicies(bucket string) (policy.BucketAccessPolicy, error) {
+func (a *azureObjects) GetBucketPolicies(bucket string) (policy.BucketAccessPolicy, error) {
 	policyInfo := policy.BucketAccessPolicy{Version: "2012-10-17"}
 	perm, err := a.client.GetContainerPermissions(bucket, 0, "")
 	if err != nil {
@@ -644,7 +721,7 @@ func (a AzureObjects) GetBucketPolicies(bucket string) (policy.BucketAccessPolic
 }
 
 // DeleteBucketPolicies - Set the container ACL to "private"
-func (a AzureObjects) DeleteBucketPolicies(bucket string) error {
+func (a *azureObjects) DeleteBucketPolicies(bucket string) error {
 	perm := storage.ContainerPermissions{
 		AccessType:     storage.ContainerAccessTypePrivate,
 		AccessPolicies: nil,

cmd/gateway-azure_test.go

@@ -25,18 +25,33 @@ import (
 )
 
 // Test canonical metadata.
-func TestCanonicalMetadata(t *testing.T) {
-	metadata := map[string]string{
+func TestS3ToAzureHeaders(t *testing.T) {
+	headers := map[string]string{
 		"accept-encoding":  "gzip",
 		"content-encoding": "gzip",
 	}
-	expectedCanonicalM := map[string]string{
+	expectedHeaders := map[string]string{
 		"Accept-Encoding":  "gzip",
 		"Content-Encoding": "gzip",
 	}
-	actualCanonicalM := canonicalMetadata(metadata)
-	if !reflect.DeepEqual(actualCanonicalM, expectedCanonicalM) {
-		t.Fatalf("Test failed, expected %#v, got %#v", expectedCanonicalM, actualCanonicalM)
+	actualHeaders := s3ToAzureHeaders(headers)
+	if !reflect.DeepEqual(actualHeaders, expectedHeaders) {
+		t.Fatalf("Test failed, expected %#v, got %#v", expectedHeaders, actualHeaders)
+	}
+}
+
+func TestAzureToS3Metadata(t *testing.T) {
+	// Just one testcase. Adding more test cases does not add value to the testcase
+	// as azureToS3Metadata() just adds a prefix.
+	metadata := map[string]string{
+		"First-Name": "myname",
+	}
+	expectedMeta := map[string]string{
+		"X-Amz-Meta-First-Name": "myname",
+	}
+	actualMeta := azureToS3Metadata(metadata)
+	if !reflect.DeepEqual(actualMeta, expectedMeta) {
+		t.Fatalf("Test failed, expected %#v, got %#v", expectedMeta, actualMeta)
 	}
 }
 

cmd/gateway-handlers.go

@@ -20,7 +20,9 @@ import (
 	"io"
 	"io/ioutil"
 	"net/http"
+	"strconv"
 
+	"encoding/hex"
 	"encoding/json"
 	"encoding/xml"
 
@@ -52,17 +54,23 @@ func (api gatewayAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Re
 		// Signature V2 validation.
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
 	case authTypeSigned, authTypePresigned:
 		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
+	case authTypeAnonymous:
+		// No verification needed for anonymous requests.
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, ErrAccessDenied, r.URL)
+		return
 	}
 
 	getObjectInfo := objectAPI.GetObjectInfo
@@ -151,6 +159,138 @@ func (api gatewayAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Re
 	}
 }
 
+// PutObjectHandler - PUT Object
+// ----------
+// This implementation of the PUT operation adds an object to a bucket.
+func (api gatewayAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	// X-Amz-Copy-Source shouldn't be set for this call.
+	if _, ok := r.Header["X-Amz-Copy-Source"]; ok {
+		writeErrorResponse(w, ErrInvalidCopySource, r.URL)
+		return
+	}
+
+	var object, bucket string
+	vars := router.Vars(r)
+	bucket = vars["bucket"]
+	object = vars["object"]
+
+	// Get Content-Md5 sent by client and verify if valid
+	md5Bytes, err := checkValidMD5(r.Header.Get("Content-Md5"))
+	if err != nil {
+		errorIf(err, "Unable to validate content-md5 format.")
+		writeErrorResponse(w, ErrInvalidDigest, r.URL)
+		return
+	}
+
+	/// if Content-Length is unknown/missing, deny the request
+	size := r.ContentLength
+	reqAuthType := getRequestAuthType(r)
+	if reqAuthType == authTypeStreamingSigned {
+		sizeStr := r.Header.Get("x-amz-decoded-content-length")
+		size, err = strconv.ParseInt(sizeStr, 10, 64)
+		if err != nil {
+			errorIf(err, "Unable to parse `x-amz-decoded-content-length` into its integer value", sizeStr)
+			writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+			return
+		}
+	}
+	if size == -1 {
+		writeErrorResponse(w, ErrMissingContentLength, r.URL)
+		return
+	}
+
+	/// maximum Upload size for objects in a single operation
+	if isMaxObjectSize(size) {
+		writeErrorResponse(w, ErrEntityTooLarge, r.URL)
+		return
+	}
+
+	// Extract metadata to be saved from incoming HTTP header.
+	metadata := extractMetadataFromHeader(r.Header)
+	if reqAuthType == authTypeStreamingSigned {
+		if contentEncoding, ok := metadata["content-encoding"]; ok {
+			contentEncoding = trimAwsChunkedContentEncoding(contentEncoding)
+			if contentEncoding != "" {
+				// Make sure to trim and save the content-encoding
+				// parameter for a streaming signature which is set
+				// to a custom value for example: "aws-chunked,gzip".
+				metadata["content-encoding"] = contentEncoding
+			} else {
+				// Trimmed content encoding is empty when the header
+				// value is set to "aws-chunked" only.
+
+				// Make sure to delete the content-encoding parameter
+				// for a streaming signature which is set to value
+				// for example: "aws-chunked"
+				delete(metadata, "content-encoding")
+			}
+		}
+	}
+
+	// Make sure we hex encode md5sum here.
+	metadata["etag"] = hex.EncodeToString(md5Bytes)
+
+	sha256sum := ""
+
+	// Lock the object.
+	objectLock := globalNSMutex.NewNSLock(bucket, object)
+	objectLock.Lock()
+	defer objectLock.Unlock()
+
+	var objInfo ObjectInfo
+	switch reqAuthType {
+	case authTypeAnonymous:
+		// Create anonymous object.
+		objInfo, err = objectAPI.AnonPutObject(bucket, object, size, r.Body, metadata, sha256sum)
+	case authTypeStreamingSigned:
+		// Initialize stream signature verifier.
+		reader, s3Error := newSignV4ChunkedReader(r)
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+		objInfo, err = objectAPI.PutObject(bucket, object, size, reader, metadata, sha256sum)
+	case authTypeSignedV2, authTypePresignedV2:
+		s3Error := isReqAuthenticatedV2(r)
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+		objInfo, err = objectAPI.PutObject(bucket, object, size, r.Body, metadata, sha256sum)
+	case authTypePresigned, authTypeSigned:
+		if s3Error := reqSignatureV4Verify(r, serverConfig.GetRegion()); s3Error != ErrNone {
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+		if !skipContentSha256Cksum(r) {
+			sha256sum = r.Header.Get("X-Amz-Content-Sha256")
+		}
+		// Create object.
+		objInfo, err = objectAPI.PutObject(bucket, object, size, r.Body, metadata, sha256sum)
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, ErrAccessDenied, r.URL)
+		return
+	}
+
+	if err != nil {
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	w.Header().Set("ETag", "\""+objInfo.ETag+"\"")
+	writeSuccessResponseHeadersOnly(w)
+}
+
 // HeadObjectHandler - HEAD Object
 // -----------
 // The HEAD operation retrieves metadata from an object without returning the object itself.
@@ -173,17 +313,23 @@ func (api gatewayAPIHandlers) HeadObjectHandler(w http.ResponseWriter, r *http.R
 		// Signature V2 validation.
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
 	case authTypeSigned, authTypePresigned:
 		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
+	case authTypeAnonymous:
+		// No verification needed for anonymous requests.
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, ErrAccessDenied, r.URL)
+		return
 	}
 
 	getObjectInfo := objectAPI.GetObjectInfo
@@ -581,17 +727,23 @@ func (api gatewayAPIHandlers) ListObjectsV1Handler(w http.ResponseWriter, r *htt
 		// Signature V2 validation.
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
 	case authTypeSigned, authTypePresigned:
 		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
+	case authTypeAnonymous:
+		// No verification needed for anonymous requests.
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, ErrAccessDenied, r.URL)
+		return
 	}
 
 	// Extract all the litsObjectsV1 query params to their native values.
@@ -645,17 +797,23 @@ func (api gatewayAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.R
 		// Signature V2 validation.
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
 	case authTypeSigned, authTypePresigned:
 		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
+	case authTypeAnonymous:
+		// No verification needed for anonymous requests.
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, ErrAccessDenied, r.URL)
+		return
 	}
 
 	getBucketInfo := objectAPI.GetBucketInfo
@@ -691,7 +849,7 @@ func (api gatewayAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r
 		// Signature V2 validation.
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
@@ -702,10 +860,16 @@ func (api gatewayAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r
 			s3Error = isReqAuthenticated(r, serverConfig.GetRegion())
 		}
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
+	case authTypeAnonymous:
+		// No verification needed for anonymous requests.
+	default:
+		// For all unknown auth types return error.
+		writeErrorResponse(w, ErrAccessDenied, r.URL)
+		return
 	}
 
 	getBucketInfo := objectAPI.GetBucketInfo

cmd/gateway-main.go

@@ -21,52 +21,49 @@ import (
 	"fmt"
 	"net/url"
 	"os"
+	"runtime"
 	"strings"
 
 	"github.com/gorilla/mux"
 	"github.com/minio/cli"
 )
 
-var gatewayTemplate = `NAME:
+const azureGatewayTemplate = `NAME:
   {{.HelpName}} - {{.Usage}}
 
 USAGE:
-  {{.HelpName}} {{if .VisibleFlags}}[FLAGS]{{end}} BACKEND [ENDPOINT]
+  {{.HelpName}} {{if .VisibleFlags}}[FLAGS]{{end}} [ENDPOINT]
 {{if .VisibleFlags}}
 FLAGS:
   {{range .VisibleFlags}}{{.}}
   {{end}}{{end}}
-BACKEND:
-  azure: Microsoft Azure Blob Storage. Default ENDPOINT is https://core.windows.net
-  s3: Amazon Simple Storage Service (S3). Default ENDPOINT is https://s3.amazonaws.com
+ENDPOINT:
+  Azure server endpoint. Default ENDPOINT is https://core.windows.net
 
 ENVIRONMENT VARIABLES:
   ACCESS:
-     MINIO_ACCESS_KEY: Username or access key of your storage backend.
-     MINIO_SECRET_KEY: Password or secret key of your storage backend.
+     MINIO_ACCESS_KEY: Username or access key of Azure storage.
+     MINIO_SECRET_KEY: Password or secret key of Azure storage.
+
+  BROWSER:
+     MINIO_BROWSER: To disable web browser access, set this value to "off".
 
 EXAMPLES:
   1. Start minio gateway server for Azure Blob Storage backend.
       $ export MINIO_ACCESS_KEY=azureaccountname
       $ export MINIO_SECRET_KEY=azureaccountkey
-      $ {{.HelpName}} azure
-
-  2. Start minio gateway server for AWS S3 backend.
-      $ export MINIO_ACCESS_KEY=accesskey
-      $ export MINIO_SECRET_KEY=secretkey
-      $ {{.HelpName}} s3
-
-  3. Start minio gateway server for S3 backend on custom endpoint.
-      $ export MINIO_ACCESS_KEY=Q3AM3UQ867SPQQA43P2F
-      $ export MINIO_SECRET_KEY=zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG
-      $ {{.HelpName}} s3 https://play.minio.io:9000
+      $ {{.HelpName}}
+  2. Start minio gateway server for Azure Blob Storage backend on custom endpoint.
+      $ export MINIO_ACCESS_KEY=azureaccountname
+      $ export MINIO_SECRET_KEY=azureaccountkey
+      $ {{.HelpName}} https://azure.example.com
 `
 
-var gatewayCmd = cli.Command{
-	Name:               "gateway",
-	Usage:              "Start object storage gateway.",
-	Action:             gatewayMain,
-	CustomHelpTemplate: gatewayTemplate,
+var azureBackendCmd = cli.Command{
+	Name:               "azure",
+	Usage:              "Microsoft Azure Blob Storage.",
+	Action:             azureGatewayMain,
+	CustomHelpTemplate: azureGatewayTemplate,
 	Flags: append(serverFlags,
 		cli.BoolFlag{
 			Name:  "quiet",
@@ -76,6 +73,59 @@ var gatewayCmd = cli.Command{
 	HideHelpCommand: true,
 }
 
+const s3GatewayTemplate = `NAME:
+  {{.HelpName}} - {{.Usage}}
+
+USAGE:
+  {{.HelpName}} {{if .VisibleFlags}}[FLAGS]{{end}} [ENDPOINT]
+{{if .VisibleFlags}}
+FLAGS:
+  {{range .VisibleFlags}}{{.}}
+  {{end}}{{end}}
+ENDPOINT:
+  S3 server endpoint. Default ENDPOINT is https://s3.amazonaws.com
+
+ENVIRONMENT VARIABLES:
+  ACCESS:
+     MINIO_ACCESS_KEY: Username or access key of S3 storage.
+     MINIO_SECRET_KEY: Password or secret key of S3 storage.
+
+  BROWSER:
+     MINIO_BROWSER: To disable web browser access, set this value to "off".
+
+EXAMPLES:
+  1. Start minio gateway server for AWS S3 backend.
+      $ export MINIO_ACCESS_KEY=accesskey
+      $ export MINIO_SECRET_KEY=secretkey
+      $ {{.HelpName}}
+
+  2. Start minio gateway server for S3 backend on custom endpoint.
+      $ export MINIO_ACCESS_KEY=Q3AM3UQ867SPQQA43P2F
+      $ export MINIO_SECRET_KEY=zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG
+      $ {{.HelpName}} https://play.minio.io:9000
+`
+
+var s3BackendCmd = cli.Command{
+	Name:               "s3",
+	Usage:              "Amazon Simple Storage Service (S3).",
+	Action:             s3GatewayMain,
+	CustomHelpTemplate: s3GatewayTemplate,
+	Flags: append(serverFlags,
+		cli.BoolFlag{
+			Name:  "quiet",
+			Usage: "Disable startup banner.",
+		},
+	),
+	HideHelpCommand: true,
+}
+
+var gatewayCmd = cli.Command{
+	Name:            "gateway",
+	Usage:           "Start object storage gateway.",
+	HideHelpCommand: true,
+	Subcommands:     []cli.Command{azureBackendCmd, s3BackendCmd},
+}
+
 // Represents the type of the gateway backend.
 type gatewayBackend string
 
@@ -96,12 +146,28 @@ func mustGetGatewayCredsFromEnv() (accessKey, secretKey string) {
 	return accessKey, secretKey
 }
 
+// Set browser setting from environment variables
+func mustSetBrowserSettingFromEnv() {
+	if browser := os.Getenv("MINIO_BROWSER"); browser != "" {
+		browserFlag, err := ParseBrowserFlag(browser)
+		if err != nil {
+			fatalIf(errors.New("invalid value"), "Unknown value ‘%s’ in MINIO_BROWSER environment variable.", browser)
+		}
+
+		// browser Envs are set globally, this does not represent
+		// if browser is turned off or on.
+		globalIsEnvBrowser = true
+		globalIsBrowserEnabled = bool(browserFlag)
+	}
+}
+
 // Initialize gateway layer depending on the backend type.
 // Supported backend types are
 //
 // - Azure Blob Storage.
 // - Add your favorite backend here.
-func newGatewayLayer(backendType, endpoint, accessKey, secretKey string, secure bool) (GatewayLayer, error) {
+func newGatewayLayer(backendType gatewayBackend, endpoint, accessKey, secretKey string, secure bool) (GatewayLayer, error) {
+
 	switch gatewayBackend(backendType) {
 	case azureBackend:
 		return newAzureLayer(endpoint, accessKey, secretKey, secure)
@@ -162,20 +228,64 @@ func parseGatewayEndpoint(arg string) (endPoint string, secure bool, err error)
 	}
 }
 
-// Handler for 'minio gateway'.
-func gatewayMain(ctx *cli.Context) {
-	if !ctx.Args().Present() || ctx.Args().First() == "help" {
-		cli.ShowCommandHelpAndExit(ctx, "gateway", 1)
+// Validate gateway arguments.
+func validateGatewayArguments(serverAddr, endpointAddr string) error {
+	if err := CheckLocalServerAddr(serverAddr); err != nil {
+		return err
 	}
 
+	if runtime.GOOS == "darwin" {
+		_, port := mustSplitHostPort(serverAddr)
+		// On macOS, if a process already listens on LOCALIPADDR:PORT, net.Listen() falls back
+		// to IPv6 address i.e minio will start listening on IPv6 address whereas another
+		// (non-)minio process is listening on IPv4 of given port.
+		// To avoid this error situation we check for port availability only for macOS.
+		if err := checkPortAvailability(port); err != nil {
+			return err
+		}
+	}
+
+	if endpointAddr != "" {
+		// Reject the endpoint if it points to the gateway handler itself.
+		sameTarget, err := sameLocalAddrs(endpointAddr, serverAddr)
+		if err != nil {
+			return err
+		}
+		if sameTarget {
+			return errors.New("endpoint points to the local gateway")
+		}
+	}
+	return nil
+}
+
+// Handler for 'minio gateway azure' command line.
+func azureGatewayMain(ctx *cli.Context) {
+	if ctx.Args().Present() && ctx.Args().First() == "help" {
+		cli.ShowCommandHelpAndExit(ctx, "azure", 1)
+	}
+
+	gatewayMain(ctx, azureBackend)
+}
+
+// Handler for 'minio gateway s3' command line.
+func s3GatewayMain(ctx *cli.Context) {
+	if ctx.Args().Present() && ctx.Args().First() == "help" {
+		cli.ShowCommandHelpAndExit(ctx, "s3", 1)
+	}
+
+	gatewayMain(ctx, s3Backend)
+}
+
+// Handler for 'minio gateway'.
+func gatewayMain(ctx *cli.Context, backendType gatewayBackend) {
 	// Fetch access and secret key from env.
 	accessKey, secretKey := mustGetGatewayCredsFromEnv()
 
+	// Fetch browser env setting
+	mustSetBrowserSettingFromEnv()
+
 	// Initialize new gateway config.
-	//
-	// TODO: add support for custom region when we add
-	// support for S3 backend storage, currently this can
-	// default to "us-east-1"
+
 	newGatewayConfig(accessKey, secretKey, globalMinioDefaultRegion)
 
 	// Get quiet flag from command line argument.
@@ -184,12 +294,14 @@ func gatewayMain(ctx *cli.Context) {
 		log.EnableQuiet()
 	}
 
-	// First argument is selected backend type.
-	backendType := ctx.Args().First()
+	serverAddr := ctx.String("address")
+	endpointAddr := ctx.Args().Get(0)
+	err := validateGatewayArguments(serverAddr, endpointAddr)
+	fatalIf(err, "Invalid argument")
 
 	// Second argument is endpoint.	If no endpoint is specified then the
 	// gateway implementation should use a default setting.
-	endPoint, secure, err := parseGatewayEndpoint(ctx.Args().Get(1))
+	endPoint, secure, err := parseGatewayEndpoint(endpointAddr)
 	fatalIf(err, "Unable to parse endpoint")
 
 	// Create certs path for SSL configuration.
@@ -201,6 +313,15 @@ func gatewayMain(ctx *cli.Context) {
 	initNSLock(false) // Enable local namespace lock.
 
 	router := mux.NewRouter().SkipClean(true)
+
+	// credentials Envs are set globally.
+	globalIsEnvCreds = true
+
+	// Register web router when its enabled.
+	if globalIsBrowserEnabled {
+		aerr := registerWebRouter(router)
+		fatalIf(aerr, "Unable to configure web browser")
+	}
 	registerGatewayAPIRouter(router, newObject)
 
 	var handlerFns = []HandlerFunc{
@@ -211,6 +332,13 @@ func gatewayMain(ctx *cli.Context) {
 		// Adds 'crossdomain.xml' policy handler to serve legacy flash clients.
 		setCrossDomainPolicy,
 		// Validates all incoming requests to have a valid date header.
+		// Redirect some pre-defined browser request paths to a static location prefix.
+		setBrowserRedirectHandler,
+		// Validates if incoming request is for restricted buckets.
+		setPrivateBucketHandler,
+		// Adds cache control for all browser requests.
+		setBrowserCacheControlHandler,
+		// Validates all incoming requests to have a valid date header.
 		setTimeValidityHandler,
 		// CORS setting for all browser API requests.
 		setCorsHandler,
@@ -221,9 +349,11 @@ func gatewayMain(ctx *cli.Context) {
 		// routes them accordingly. Client receives a HTTP error for
 		// invalid/unsupported signatures.
 		setAuthHandler,
+		// Add new handlers here.
+
 	}
 
-	apiServer := NewServerMux(ctx.String("address"), registerHandlers(router, handlerFns...))
+	apiServer := NewServerMux(serverAddr, registerHandlers(router, handlerFns...))
 
 	_, _, globalIsSSL, err = getSSLConfig()
 	fatalIf(err, "Invalid SSL key file")

cmd/gateway-main_test.go

@@ -16,7 +16,11 @@
 
 package cmd
 
-import "testing"
+import (
+	"os"
+	"strings"
+	"testing"
+)
 
 // Test parseGatewayEndpoint
 func TestParseGatewayEndpoint(t *testing.T) {
@@ -48,3 +52,57 @@ func TestParseGatewayEndpoint(t *testing.T) {
 		}
 	}
 }
+
+func TestSetBrowserFromEnv(t *testing.T) {
+	browser := os.Getenv("MINIO_BROWSER")
+
+	os.Setenv("MINIO_BROWSER", "on")
+	mustSetBrowserSettingFromEnv()
+	if globalIsBrowserEnabled != true {
+		t.Errorf("Expected the response status to be `%t`, but instead found `%t`", globalIsBrowserEnabled, false)
+	}
+
+	os.Setenv("MINIO_BROWSER", "off")
+	mustSetBrowserSettingFromEnv()
+	if globalIsBrowserEnabled != false {
+		t.Errorf("Expected the response status to be `%t`, but instead found `%t`", globalIsBrowserEnabled, true)
+	}
+	os.Setenv("MINIO_BROWSER", "")
+	mustSetBrowserSettingFromEnv()
+	if globalIsBrowserEnabled != false {
+		t.Errorf("Expected the response status to be `%t`, but instead found `%t`", globalIsBrowserEnabled, true)
+	}
+	os.Setenv("MINIO_BROWSER", browser)
+}
+
+// Test validateGatewayArguments
+func TestValidateGatewayArguments(t *testing.T) {
+	nonLoopBackIPs := localIP4.FuncMatch(func(ip string, matchString string) bool {
+		return !strings.HasPrefix(ip, "127.")
+	}, "")
+	if len(nonLoopBackIPs) == 0 {
+		t.Fatalf("No non-loop back IP address found for this host")
+	}
+	nonLoopBackIP := nonLoopBackIPs.ToSlice()[0]
+
+	testCases := []struct {
+		serverAddr   string
+		endpointAddr string
+		valid        bool
+	}{
+		{":9000", "http://localhost:9001", true},
+		{":9000", "http://google.com", true},
+		{"123.123.123.123:9000", "http://localhost:9000", false},
+		{":9000", "http://localhost:9000", false},
+		{":9000", nonLoopBackIP + ":9000", false},
+	}
+	for i, test := range testCases {
+		err := validateGatewayArguments(test.serverAddr, test.endpointAddr)
+		if test.valid && err != nil {
+			t.Errorf("Test %d expected not to return error but got %s", i+1, err)
+		}
+		if !test.valid && err == nil {
+			t.Errorf("Test %d expected to fail but it did not", i+1)
+		}
+	}
+}

cmd/gateway-router.go

@@ -27,10 +27,11 @@ import (
 type GatewayLayer interface {
 	ObjectLayer
 
-	MakeBucketWithLocation(bucket, location string) error
-
 	AnonGetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) (err error)
 	AnonGetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error)
+
+	AnonPutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (ObjectInfo, error)
+
 	SetBucketPolicies(string, policy.BucketAccessPolicy) error
 	GetBucketPolicies(string) (policy.BucketAccessPolicy, error)
 	DeleteBucketPolicies(string) error

cmd/gateway-s3-anonymous.go

@@ -17,13 +17,44 @@
 package cmd
 
 import (
+	"encoding/hex"
 	"io"
 
 	minio "github.com/minio/minio-go"
 )
 
+// AnonPutObject creates a new object anonymously with the incoming data,
+func (l *s3Objects) AnonPutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (ObjectInfo, error) {
+	var sha256sumBytes []byte
+
+	var err error
+	if sha256sum != "" {
+		sha256sumBytes, err = hex.DecodeString(sha256sum)
+		if err != nil {
+			return ObjectInfo{}, s3ToObjectError(traceError(err), bucket, object)
+		}
+	}
+
+	var md5sumBytes []byte
+	md5sum := metadata["etag"]
+	if md5sum != "" {
+		md5sumBytes, err = hex.DecodeString(md5sum)
+		if err != nil {
+			return ObjectInfo{}, s3ToObjectError(traceError(err), bucket, object)
+		}
+		delete(metadata, "etag")
+	}
+
+	oi, err := l.anonClient.PutObject(bucket, object, size, data, md5sumBytes, sha256sumBytes, toMinioClientMetadata(metadata))
+	if err != nil {
+		return ObjectInfo{}, s3ToObjectError(traceError(err), bucket, object)
+	}
+
+	return fromMinioClientObjectInfo(bucket, oi), nil
+}
+
 // AnonGetObject - Get object anonymously
-func (l *s3Gateway) AnonGetObject(bucket string, key string, startOffset int64, length int64, writer io.Writer) error {
+func (l *s3Objects) AnonGetObject(bucket string, key string, startOffset int64, length int64, writer io.Writer) error {
 	r := minio.NewGetReqHeaders()
 	if err := r.SetRange(startOffset, startOffset+length-1); err != nil {
 		return s3ToObjectError(traceError(err), bucket, key)
@@ -43,7 +74,7 @@ func (l *s3Gateway) AnonGetObject(bucket string, key string, startOffset int64,
 }
 
 // AnonGetObjectInfo - Get object info anonymously
-func (l *s3Gateway) AnonGetObjectInfo(bucket string, object string) (ObjectInfo, error) {
+func (l *s3Objects) AnonGetObjectInfo(bucket string, object string) (ObjectInfo, error) {
 	r := minio.NewHeadReqHeaders()
 	oi, err := l.anonClient.StatObject(bucket, object, r)
 	if err != nil {
@@ -54,7 +85,7 @@ func (l *s3Gateway) AnonGetObjectInfo(bucket string, object string) (ObjectInfo,
 }
 
 // AnonListObjects - List objects anonymously
-func (l *s3Gateway) AnonListObjects(bucket string, prefix string, marker string, delimiter string, maxKeys int) (ListObjectsInfo, error) {
+func (l *s3Objects) AnonListObjects(bucket string, prefix string, marker string, delimiter string, maxKeys int) (ListObjectsInfo, error) {
 	result, err := l.anonClient.ListObjects(bucket, prefix, marker, delimiter, maxKeys)
 	if err != nil {
 		return ListObjectsInfo{}, s3ToObjectError(traceError(err), bucket)
@@ -64,7 +95,7 @@ func (l *s3Gateway) AnonListObjects(bucket string, prefix string, marker string,
 }
 
 // AnonGetBucketInfo - Get bucket metadata anonymously.
-func (l *s3Gateway) AnonGetBucketInfo(bucket string) (BucketInfo, error) {
+func (l *s3Objects) AnonGetBucketInfo(bucket string) (BucketInfo, error) {
 	if exists, err := l.anonClient.BucketExists(bucket); err != nil {
 		return BucketInfo{}, s3ToObjectError(traceError(err), bucket)
 	} else if !exists {

cmd/gateway-s3-unsupported.go

@@ -17,26 +17,26 @@
 package cmd
 
 // HealBucket - Not relevant.
-func (l *s3Gateway) HealBucket(bucket string) error {
+func (l *s3Objects) HealBucket(bucket string) error {
 	return traceError(NotImplemented{})
 }
 
 // ListBucketsHeal - Not relevant.
-func (l *s3Gateway) ListBucketsHeal() (buckets []BucketInfo, err error) {
+func (l *s3Objects) ListBucketsHeal() (buckets []BucketInfo, err error) {
 	return []BucketInfo{}, traceError(NotImplemented{})
 }
 
 // HealObject - Not relevant.
-func (l *s3Gateway) HealObject(bucket string, object string) (int, int, error) {
+func (l *s3Objects) HealObject(bucket string, object string) (int, int, error) {
 	return 0, 0, traceError(NotImplemented{})
 }
 
 // ListObjectsHeal - Not relevant.
-func (l *s3Gateway) ListObjectsHeal(bucket string, prefix string, marker string, delimiter string, maxKeys int) (ListObjectsInfo, error) {
+func (l *s3Objects) ListObjectsHeal(bucket string, prefix string, marker string, delimiter string, maxKeys int) (ListObjectsInfo, error) {
 	return ListObjectsInfo{}, traceError(NotImplemented{})
 }
 
 // ListUploadsHeal - Not relevant.
-func (l *s3Gateway) ListUploadsHeal(bucket string, prefix string, marker string, uploadIDMarker string, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
+func (l *s3Objects) ListUploadsHeal(bucket string, prefix string, marker string, uploadIDMarker string, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
 	return ListMultipartsInfo{}, traceError(NotImplemented{})
 }

cmd/gateway-s3.go

@@ -17,12 +17,11 @@
 package cmd
 
 import (
+	"encoding/hex"
 	"io"
 	"net/http"
 	"path"
 
-	"encoding/hex"
-
 	minio "github.com/minio/minio-go"
 	"github.com/minio/minio-go/pkg/policy"
 )
@@ -91,8 +90,8 @@ func s3ToObjectError(err error, params ...string) error {
 	return e
 }
 
-// s3Gateway implements gateway for Minio and S3 compatible object storage servers.
-type s3Gateway struct {
+// s3Objects implements gateway for Minio and S3 compatible object storage servers.
+type s3Objects struct {
 	Client     *minio.Core
 	anonClient *minio.Core
 }
@@ -115,7 +114,7 @@ func newS3Gateway(endpoint string, accessKey, secretKey string, secure bool) (Ga
 		return nil, err
 	}
 
-	return &s3Gateway{
+	return &s3Objects{
 		Client:     client,
 		anonClient: anonClient,
 	}, nil
@@ -123,24 +122,18 @@ func newS3Gateway(endpoint string, accessKey, secretKey string, secure bool) (Ga
 
 // Shutdown saves any gateway metadata to disk
 // if necessary and reload upon next restart.
-func (l *s3Gateway) Shutdown() error {
+func (l *s3Objects) Shutdown() error {
 	// TODO
 	return nil
 }
 
 // StorageInfo is not relevant to S3 backend.
-func (l *s3Gateway) StorageInfo() StorageInfo {
+func (l *s3Objects) StorageInfo() StorageInfo {
 	return StorageInfo{}
 }
 
 // MakeBucket creates a new container on S3 backend.
-func (l *s3Gateway) MakeBucket(bucket string) error {
-	// will never be called, only satisfy ObjectLayer interface
-	return traceError(NotImplemented{})
-}
-
-// MakeBucket creates a new container on S3 backend.
-func (l *s3Gateway) MakeBucketWithLocation(bucket, location string) error {
+func (l *s3Objects) MakeBucketWithLocation(bucket, location string) error {
 	err := l.Client.MakeBucket(bucket, location)
 	if err != nil {
 		return s3ToObjectError(traceError(err), bucket)
@@ -149,7 +142,7 @@ func (l *s3Gateway) MakeBucketWithLocation(bucket, location string) error {
 }
 
 // GetBucketInfo gets bucket metadata..
-func (l *s3Gateway) GetBucketInfo(bucket string) (BucketInfo, error) {
+func (l *s3Objects) GetBucketInfo(bucket string) (BucketInfo, error) {
 	buckets, err := l.Client.ListBuckets()
 	if err != nil {
 		return BucketInfo{}, s3ToObjectError(traceError(err), bucket)
@@ -170,7 +163,7 @@ func (l *s3Gateway) GetBucketInfo(bucket string) (BucketInfo, error) {
 }
 
 // ListBuckets lists all S3 buckets
-func (l *s3Gateway) ListBuckets() ([]BucketInfo, error) {
+func (l *s3Objects) ListBuckets() ([]BucketInfo, error) {
 	buckets, err := l.Client.ListBuckets()
 	if err != nil {
 		return nil, err
@@ -188,7 +181,7 @@ func (l *s3Gateway) ListBuckets() ([]BucketInfo, error) {
 }
 
 // DeleteBucket deletes a bucket on S3
-func (l *s3Gateway) DeleteBucket(bucket string) error {
+func (l *s3Objects) DeleteBucket(bucket string) error {
 	err := l.Client.RemoveBucket(bucket)
 	if err != nil {
 		return s3ToObjectError(traceError(err), bucket)
@@ -197,7 +190,7 @@ func (l *s3Gateway) DeleteBucket(bucket string) error {
 }
 
 // ListObjects lists all blobs in S3 bucket filtered by prefix
-func (l *s3Gateway) ListObjects(bucket string, prefix string, marker string, delimiter string, maxKeys int) (ListObjectsInfo, error) {
+func (l *s3Objects) ListObjects(bucket string, prefix string, marker string, delimiter string, maxKeys int) (ListObjectsInfo, error) {
 	result, err := l.Client.ListObjects(bucket, prefix, marker, delimiter, maxKeys)
 	if err != nil {
 		return ListObjectsInfo{}, s3ToObjectError(traceError(err), bucket)
@@ -207,7 +200,7 @@ func (l *s3Gateway) ListObjects(bucket string, prefix string, marker string, del
 }
 
 // ListObjectsV2 lists all blobs in S3 bucket filtered by prefix
-func (l *s3Gateway) ListObjectsV2(bucket, prefix, continuationToken string, fetchOwner bool, delimiter string, maxKeys int) (ListObjectsV2Info, error) {
+func (l *s3Objects) ListObjectsV2(bucket, prefix, continuationToken string, fetchOwner bool, delimiter string, maxKeys int) (ListObjectsV2Info, error) {
 	result, err := l.Client.ListObjectsV2(bucket, prefix, continuationToken, fetchOwner, delimiter, maxKeys)
 	if err != nil {
 		return ListObjectsV2Info{}, s3ToObjectError(traceError(err), bucket)
@@ -266,10 +259,17 @@ func fromMinioClientListBucketResult(bucket string, result minio.ListBucketResul
 //
 // startOffset indicates the starting read location of the object.
 // length indicates the total length of the object.
-func (l *s3Gateway) GetObject(bucket string, key string, startOffset int64, length int64, writer io.Writer) error {
+func (l *s3Objects) GetObject(bucket string, key string, startOffset int64, length int64, writer io.Writer) error {
 	r := minio.NewGetReqHeaders()
-	if err := r.SetRange(startOffset, startOffset+length-1); err != nil {
-		return s3ToObjectError(traceError(err), bucket, key)
+
+	if length < 0 && length != -1 {
+		return s3ToObjectError(traceError(errInvalidArgument), bucket, key)
+	}
+
+	if startOffset >= 0 && length >= 0 {
+		if err := r.SetRange(startOffset, startOffset+length-1); err != nil {
+			return s3ToObjectError(traceError(err), bucket, key)
+		}
 	}
 	object, _, err := l.Client.GetObject(bucket, key, r)
 	if err != nil {
@@ -278,10 +278,9 @@ func (l *s3Gateway) GetObject(bucket string, key string, startOffset int64, leng
 
 	defer object.Close()
 
-	if _, err := io.CopyN(writer, object, length); err != nil {
+	if _, err := io.Copy(writer, object); err != nil {
 		return s3ToObjectError(traceError(err), bucket, key)
 	}
-
 	return nil
 }
 
@@ -295,7 +294,7 @@ func fromMinioClientObjectInfo(bucket string, oi minio.ObjectInfo) ObjectInfo {
 		Name:            oi.Key,
 		ModTime:         oi.LastModified,
 		Size:            oi.Size,
-		MD5Sum:          oi.ETag,
+		ETag:            oi.ETag,
 		UserDefined:     userDefined,
 		ContentType:     oi.ContentType,
 		ContentEncoding: oi.Metadata.Get("Content-Encoding"),
@@ -303,7 +302,7 @@ func fromMinioClientObjectInfo(bucket string, oi minio.ObjectInfo) ObjectInfo {
 }
 
 // GetObjectInfo reads object info and replies back ObjectInfo
-func (l *s3Gateway) GetObjectInfo(bucket string, object string) (objInfo ObjectInfo, err error) {
+func (l *s3Objects) GetObjectInfo(bucket string, object string) (objInfo ObjectInfo, err error) {
 	r := minio.NewHeadReqHeaders()
 	oi, err := l.Client.StatObject(bucket, object, r)
 	if err != nil {
@@ -314,7 +313,7 @@ func (l *s3Gateway) GetObjectInfo(bucket string, object string) (objInfo ObjectI
 }
 
 // PutObject creates a new object with the incoming data,
-func (l *s3Gateway) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (ObjectInfo, error) {
+func (l *s3Objects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (ObjectInfo, error) {
 	var sha256sumBytes []byte
 
 	var err error
@@ -326,13 +325,13 @@ func (l *s3Gateway) PutObject(bucket string, object string, size int64, data io.
 	}
 
 	var md5sumBytes []byte
-	md5sum := metadata["md5Sum"]
+	md5sum := metadata["etag"]
 	if md5sum != "" {
 		md5sumBytes, err = hex.DecodeString(md5sum)
 		if err != nil {
 			return ObjectInfo{}, s3ToObjectError(traceError(err), bucket, object)
 		}
-		delete(metadata, "md5Sum")
+		delete(metadata, "etag")
 	}
 
 	oi, err := l.Client.PutObject(bucket, object, size, data, md5sumBytes, sha256sumBytes, toMinioClientMetadata(metadata))
@@ -344,7 +343,7 @@ func (l *s3Gateway) PutObject(bucket string, object string, size int64, data io.
 }
 
 // CopyObject copies a blob from source container to destination container.
-func (l *s3Gateway) CopyObject(srcBucket string, srcObject string, destBucket string, destObject string, metadata map[string]string) (ObjectInfo, error) {
+func (l *s3Objects) CopyObject(srcBucket string, srcObject string, destBucket string, destObject string, metadata map[string]string) (ObjectInfo, error) {
 	err := l.Client.CopyObject(destBucket, destObject, path.Join(srcBucket, srcObject), minio.CopyConditions{})
 	if err != nil {
 		return ObjectInfo{}, s3ToObjectError(traceError(err), srcBucket, srcObject)
@@ -359,7 +358,7 @@ func (l *s3Gateway) CopyObject(srcBucket string, srcObject string, destBucket st
 }
 
 // DeleteObject deletes a blob in bucket
-func (l *s3Gateway) DeleteObject(bucket string, object string) error {
+func (l *s3Objects) DeleteObject(bucket string, object string) error {
 	err := l.Client.RemoveObject(bucket, object)
 	if err != nil {
 		return s3ToObjectError(traceError(err), bucket, object)
@@ -407,7 +406,7 @@ func fromMinioClientListMultipartsInfo(lmur minio.ListMultipartUploadsResult) Li
 }
 
 // ListMultipartUploads lists all multipart uploads.
-func (l *s3Gateway) ListMultipartUploads(bucket string, prefix string, keyMarker string, uploadIDMarker string, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
+func (l *s3Objects) ListMultipartUploads(bucket string, prefix string, keyMarker string, uploadIDMarker string, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
 	result, err := l.Client.ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
 	if err != nil {
 		return ListMultipartsInfo{}, err
@@ -435,12 +434,12 @@ func toMinioClientMetadata(metadata map[string]string) map[string][]string {
 }
 
 // NewMultipartUpload upload object in multiple parts
-func (l *s3Gateway) NewMultipartUpload(bucket string, object string, metadata map[string]string) (uploadID string, err error) {
+func (l *s3Objects) NewMultipartUpload(bucket string, object string, metadata map[string]string) (uploadID string, err error) {
 	return l.Client.NewMultipartUpload(bucket, object, toMinioClientMetadata(metadata))
 }
 
 // CopyObjectPart copy part of object to other bucket and object
-func (l *s3Gateway) CopyObjectPart(srcBucket string, srcObject string, destBucket string, destObject string, uploadID string, partID int, startOffset int64, length int64) (info PartInfo, err error) {
+func (l *s3Objects) CopyObjectPart(srcBucket string, srcObject string, destBucket string, destObject string, uploadID string, partID int, startOffset int64, length int64) (info PartInfo, err error) {
 	// FIXME: implement CopyObjectPart
 	return PartInfo{}, traceError(NotImplemented{})
 }
@@ -449,14 +448,14 @@ func (l *s3Gateway) CopyObjectPart(srcBucket string, srcObject string, destBucke
 func fromMinioClientObjectPart(op minio.ObjectPart) PartInfo {
 	return PartInfo{
 		Size:         op.Size,
-		ETag:         op.ETag,
+		ETag:         canonicalizeETag(op.ETag),
 		LastModified: op.LastModified,
 		PartNumber:   op.PartNumber,
 	}
 }
 
 // PutObjectPart puts a part of object in bucket
-func (l *s3Gateway) PutObjectPart(bucket string, object string, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (PartInfo, error) {
+func (l *s3Objects) PutObjectPart(bucket string, object string, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (PartInfo, error) {
 	md5HexBytes, err := hex.DecodeString(md5Hex)
 	if err != nil {
 		return PartInfo{}, err
@@ -501,7 +500,7 @@ func fromMinioClientListPartsInfo(lopr minio.ListObjectPartsResult) ListPartsInf
 }
 
 // ListObjectParts returns all object parts for specified object in specified bucket
-func (l *s3Gateway) ListObjectParts(bucket string, object string, uploadID string, partNumberMarker int, maxParts int) (ListPartsInfo, error) {
+func (l *s3Objects) ListObjectParts(bucket string, object string, uploadID string, partNumberMarker int, maxParts int) (ListPartsInfo, error) {
 	result, err := l.Client.ListObjectParts(bucket, object, uploadID, partNumberMarker, maxParts)
 	if err != nil {
 		return ListPartsInfo{}, err
@@ -511,7 +510,7 @@ func (l *s3Gateway) ListObjectParts(bucket string, object string, uploadID strin
 }
 
 // AbortMultipartUpload aborts a ongoing multipart upload
-func (l *s3Gateway) AbortMultipartUpload(bucket string, object string, uploadID string) error {
+func (l *s3Objects) AbortMultipartUpload(bucket string, object string, uploadID string) error {
 	return l.Client.AbortMultipartUpload(bucket, object, uploadID)
 }
 
@@ -533,7 +532,7 @@ func toMinioClientCompleteParts(parts []completePart) []minio.CompletePart {
 }
 
 // CompleteMultipartUpload completes ongoing multipart upload and finalizes object
-func (l *s3Gateway) CompleteMultipartUpload(bucket string, object string, uploadID string, uploadedParts []completePart) (ObjectInfo, error) {
+func (l *s3Objects) CompleteMultipartUpload(bucket string, object string, uploadID string, uploadedParts []completePart) (ObjectInfo, error) {
 	err := l.Client.CompleteMultipartUpload(bucket, object, uploadID, toMinioClientCompleteParts(uploadedParts))
 	if err != nil {
 		return ObjectInfo{}, s3ToObjectError(traceError(err), bucket, object)
@@ -543,7 +542,7 @@ func (l *s3Gateway) CompleteMultipartUpload(bucket string, object string, upload
 }
 
 // SetBucketPolicies sets policy on bucket
-func (l *s3Gateway) SetBucketPolicies(bucket string, policyInfo policy.BucketAccessPolicy) error {
+func (l *s3Objects) SetBucketPolicies(bucket string, policyInfo policy.BucketAccessPolicy) error {
 	if err := l.Client.PutBucketPolicy(bucket, policyInfo); err != nil {
 		return s3ToObjectError(traceError(err), bucket, "")
 	}
@@ -552,7 +551,7 @@ func (l *s3Gateway) SetBucketPolicies(bucket string, policyInfo policy.BucketAcc
 }
 
 // GetBucketPolicies will get policy on bucket
-func (l *s3Gateway) GetBucketPolicies(bucket string) (policy.BucketAccessPolicy, error) {
+func (l *s3Objects) GetBucketPolicies(bucket string) (policy.BucketAccessPolicy, error) {
 	policyInfo, err := l.Client.GetBucketPolicy(bucket)
 	if err != nil {
 		return policy.BucketAccessPolicy{}, s3ToObjectError(traceError(err), bucket, "")
@@ -561,10 +560,9 @@ func (l *s3Gateway) GetBucketPolicies(bucket string) (policy.BucketAccessPolicy,
 }
 
 // DeleteBucketPolicies deletes all policies on bucket
-func (l *s3Gateway) DeleteBucketPolicies(bucket string) error {
+func (l *s3Objects) DeleteBucketPolicies(bucket string) error {
 	if err := l.Client.PutBucketPolicy(bucket, policy.BucketAccessPolicy{}); err != nil {
 		return s3ToObjectError(traceError(err), bucket, "")
 	}
-
 	return nil
 }

cmd/gateway-startup-msg.go

@@ -23,7 +23,7 @@ import (
 )
 
 // Prints the formatted startup message.
-func printGatewayStartupMessage(apiEndPoints []string, accessKey, secretKey, backendType string) {
+func printGatewayStartupMessage(apiEndPoints []string, accessKey, secretKey string, backendType gatewayBackend) {
 	// Prints credential.
 	printGatewayCommonMsg(apiEndPoints, accessKey, secretKey)
 

cmd/globals.go

@@ -29,7 +29,7 @@ import (
 const (
 	globalMinioCertExpireWarnDays = time.Hour * 24 * 30 // 30 days.
 
-	globalMinioDefaultRegion       = "us-east-1"
+	globalMinioDefaultRegion       = ""
 	globalMinioDefaultOwnerID      = "minio"
 	globalMinioDefaultStorageClass = "STANDARD"
 	globalWindowsOSName            = "windows"
@@ -64,6 +64,7 @@ var (
 
 	// This flag is set to 'true' by default
 	globalIsBrowserEnabled = true
+
 	// This flag is set to 'true' when MINIO_BROWSER env is set.
 	globalIsEnvBrowser = false
 
@@ -72,6 +73,7 @@ var (
 
 	// This flag is set to 'true' wen MINIO_REGION env is set.
 	globalIsEnvRegion = false
+
 	// This flag is set to 'us-east-1' by default
 	globalServerRegion = globalMinioDefaultRegion
 
@@ -128,3 +130,23 @@ var (
 	colorBold = color.New(color.Bold).SprintFunc()
 	colorBlue = color.New(color.FgBlue).SprintfFunc()
 )
+
+// Returns minio global information, as a key value map.
+// returned list of global values is not an exhaustive
+// list. Feel free to add new relevant fields.
+func getGlobalInfo() (globalInfo map[string]interface{}) {
+	globalInfo = map[string]interface{}{
+		"isDistXL":         globalIsDistXL,
+		"isXL":             globalIsXL,
+		"isBrowserEnabled": globalIsBrowserEnabled,
+		"isEnvBrowser":     globalIsEnvBrowser,
+		"isEnvCreds":       globalIsEnvCreds,
+		"isEnvRegion":      globalIsEnvRegion,
+		"isSSL":            globalIsSSL,
+		"serverRegion":     globalServerRegion,
+		"serverUserAgent":  globalServerUserAgent,
+		// Add more relevant global settings here.
+	}
+
+	return globalInfo
+}

cmd/handler-utils.go

@@ -38,7 +38,7 @@ func parseLocationConstraint(r *http.Request) (location string, s3Error APIError
 	} // else for both err as nil or io.EOF
 	location = locationConstraint.Location
 	if location == "" {
-		location = globalMinioDefaultRegion
+		location = serverConfig.GetRegion()
 	}
 	return location, ErrNone
 }
@@ -46,7 +46,7 @@ func parseLocationConstraint(r *http.Request) (location string, s3Error APIError
 // Validates input location is same as configured region
 // of Minio server.
 func isValidLocation(location string) bool {
-	return serverConfig.GetRegion() == location
+	return serverConfig.GetRegion() == "" || serverConfig.GetRegion() == location
 }
 
 // Supported headers that needs to be extracted.
@@ -134,7 +134,7 @@ func getRedirectPostRawQuery(objInfo ObjectInfo) string {
 	redirectValues := make(url.Values)
 	redirectValues.Set("bucket", objInfo.Bucket)
 	redirectValues.Set("key", objInfo.Name)
-	redirectValues.Set("etag", "\""+objInfo.MD5Sum+"\"")
+	redirectValues.Set("etag", "\""+objInfo.ETag+"\"")
 	return redirectValues.Encode()
 }
 

cmd/jwt_test.go

@@ -44,7 +44,7 @@ func testAuthenticate(authType string, t *testing.T) {
 		// Secret key too small.
 		{"myuser", "pass", errInvalidSecretKeyLength},
 		// Secret key too long.
-		{"myuser", "pass1234567890123456789012345678901234567", errInvalidSecretKeyLength},
+		{"myuser", "pass1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890", errInvalidSecretKeyLength},
 		// Authentication error.
 		{"myuser", "mypassword", errInvalidAccessKeyID},
 		// Authentication error.

cmd/lock-rpc-server-common.go

@@ -22,7 +22,7 @@ import (
 )
 
 // Similar to removeEntry but only removes an entry only if the lock entry exists in map.
-func (l *lockServer) removeEntryIfExists(nlrip nameLockRequesterInfoPair) {
+func (l *localLocker) removeEntryIfExists(nlrip nameLockRequesterInfoPair) {
 	// Check if entry is still in map (could have been removed altogether by 'concurrent' (R)Unlock of last entry)
 	if lri, ok := l.lockMap[nlrip.name]; ok {
 		if !l.removeEntry(nlrip.name, nlrip.lri.uid, &lri) {
@@ -38,7 +38,7 @@ func (l *lockServer) removeEntryIfExists(nlrip nameLockRequesterInfoPair) {
 
 // removeEntry either, based on the uid of the lock message, removes a single entry from the
 // lockRequesterInfo array or the whole array from the map (in case of a write lock or last read lock)
-func (l *lockServer) removeEntry(name, uid string, lri *[]lockRequesterInfo) bool {
+func (l *localLocker) removeEntry(name, uid string, lri *[]lockRequesterInfo) bool {
 	// Find correct entry to remove based on uid.
 	for index, entry := range *lri {
 		if entry.uid == uid {

cmd/lock-rpc-server-common_test.go

@@ -38,9 +38,9 @@ func TestLockRpcServerRemoveEntryIfExists(t *testing.T) {
 	nlrip := nameLockRequesterInfoPair{name: "name", lri: lri}
 
 	// first test by simulating item has already been deleted
-	locker.removeEntryIfExists(nlrip)
+	locker.ll.removeEntryIfExists(nlrip)
 	{
-		gotLri, _ := locker.lockMap["name"]
+		gotLri, _ := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo(nil)
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -48,10 +48,10 @@ func TestLockRpcServerRemoveEntryIfExists(t *testing.T) {
 	}
 
 	// then test normal deletion
-	locker.lockMap["name"] = []lockRequesterInfo{lri} // add item
-	locker.removeEntryIfExists(nlrip)
+	locker.ll.lockMap["name"] = []lockRequesterInfo{lri} // add item
+	locker.ll.removeEntryIfExists(nlrip)
 	{
-		gotLri, _ := locker.lockMap["name"]
+		gotLri, _ := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo(nil)
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -81,32 +81,32 @@ func TestLockRpcServerRemoveEntry(t *testing.T) {
 		timeLastCheck:   UTCNow(),
 	}
 
-	locker.lockMap["name"] = []lockRequesterInfo{
+	locker.ll.lockMap["name"] = []lockRequesterInfo{
 		lockRequesterInfo1,
 		lockRequesterInfo2,
 	}
 
-	lri, _ := locker.lockMap["name"]
+	lri, _ := locker.ll.lockMap["name"]
 
 	// test unknown uid
-	if locker.removeEntry("name", "unknown-uid", &lri) {
+	if locker.ll.removeEntry("name", "unknown-uid", &lri) {
 		t.Errorf("Expected %#v, got %#v", false, true)
 	}
 
-	if !locker.removeEntry("name", "0123-4567", &lri) {
+	if !locker.ll.removeEntry("name", "0123-4567", &lri) {
 		t.Errorf("Expected %#v, got %#v", true, false)
 	} else {
-		gotLri, _ := locker.lockMap["name"]
+		gotLri, _ := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo{lockRequesterInfo2}
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
 		}
 	}
 
-	if !locker.removeEntry("name", "89ab-cdef", &lri) {
+	if !locker.ll.removeEntry("name", "89ab-cdef", &lri) {
 		t.Errorf("Expected %#v, got %#v", true, false)
 	} else {
-		gotLri, _ := locker.lockMap["name"]
+		gotLri, _ := locker.ll.lockMap["name"]
 		expectedLri := []lockRequesterInfo(nil)
 		if !reflect.DeepEqual(expectedLri, gotLri) {
 			t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)

cmd/lock-rpc-server.go

@@ -60,9 +60,7 @@ func isWriteLock(lri []lockRequesterInfo) bool {
 // lockServer is type for RPC handlers
 type lockServer struct {
 	AuthRPCServer
-	serviceEndpoint string
-	mutex           sync.Mutex
-	lockMap         map[string][]lockRequesterInfo
+	ll localLocker
 }
 
 // Start lock maintenance from all lock servers.
@@ -91,30 +89,11 @@ func startLockMaintainence(lockServers []*lockServer) {
 
 // Register distributed NS lock handlers.
 func registerDistNSLockRouter(mux *router.Router, endpoints EndpointList) error {
-	// Initialize a new set of lock servers.
-	lockServers := newLockServers(endpoints)
-
 	// Start lock maintenance from all lock servers.
-	startLockMaintainence(lockServers)
+	startLockMaintainence(globalLockServers)
 
 	// Register initialized lock servers to their respective rpc endpoints.
-	return registerStorageLockers(mux, lockServers)
-}
-
-// Create one lock server for every local storage rpc server.
-func newLockServers(endpoints EndpointList) (lockServers []*lockServer) {
-	for _, endpoint := range endpoints {
-		// Initialize new lock server for each local node.
-		if endpoint.IsLocal {
-			lockServers = append(lockServers, &lockServer{
-				serviceEndpoint: endpoint.Path,
-				mutex:           sync.Mutex{},
-				lockMap:         make(map[string][]lockRequesterInfo),
-			})
-		}
-	}
-
-	return lockServers
+	return registerStorageLockers(mux, globalLockServers)
 }
 
 // registerStorageLockers - register locker rpc handlers for net/rpc library clients
@@ -125,129 +104,178 @@ func registerStorageLockers(mux *router.Router, lockServers []*lockServer) error
 			return traceError(err)
 		}
 		lockRouter := mux.PathPrefix(minioReservedBucketPath).Subrouter()
-		lockRouter.Path(path.Join(lockServicePath, lockServer.serviceEndpoint)).Handler(lockRPCServer)
+		lockRouter.Path(path.Join(lockServicePath, lockServer.ll.serviceEndpoint)).Handler(lockRPCServer)
 	}
 	return nil
 }
 
-///  Distributed lock handlers
+// localLocker implements Dsync.NetLocker
+type localLocker struct {
+	mutex           sync.Mutex
+	serviceEndpoint string
+	serverAddr      string
+	lockMap         map[string][]lockRequesterInfo
+}
 
-// Lock - rpc handler for (single) write lock operation.
-func (l *lockServer) Lock(args *LockArgs, reply *bool) error {
+func (l *localLocker) ServerAddr() string {
+	return l.serverAddr
+}
+
+func (l *localLocker) ServiceEndpoint() string {
+	return l.serviceEndpoint
+}
+
+func (l *localLocker) Lock(args dsync.LockArgs) (reply bool, err error) {
 	l.mutex.Lock()
 	defer l.mutex.Unlock()
-	if err := args.IsAuthenticated(); err != nil {
-		return err
-	}
-	_, *reply = l.lockMap[args.LockArgs.Resource]
-	if !*reply { // No locks held on the given name, so claim write lock
-		l.lockMap[args.LockArgs.Resource] = []lockRequesterInfo{
+	_, isLockTaken := l.lockMap[args.Resource]
+	if !isLockTaken { // No locks held on the given name, so claim write lock
+		l.lockMap[args.Resource] = []lockRequesterInfo{
 			{
 				writer:          true,
-				node:            args.LockArgs.ServerAddr,
-				serviceEndpoint: args.LockArgs.ServiceEndpoint,
-				uid:             args.LockArgs.UID,
+				node:            args.ServerAddr,
+				serviceEndpoint: args.ServiceEndpoint,
+				uid:             args.UID,
 				timestamp:       UTCNow(),
 				timeLastCheck:   UTCNow(),
 			},
 		}
 	}
-	*reply = !*reply // Negate *reply to return true when lock is granted or false otherwise
-	return nil
+	// return reply=true if lock was granted.
+	return !isLockTaken, nil
 }
 
-// Unlock - rpc handler for (single) write unlock operation.
-func (l *lockServer) Unlock(args *LockArgs, reply *bool) error {
+func (l *localLocker) Unlock(args dsync.LockArgs) (reply bool, err error) {
 	l.mutex.Lock()
 	defer l.mutex.Unlock()
-	if err := args.IsAuthenticated(); err != nil {
-		return err
-	}
 	var lri []lockRequesterInfo
-	if lri, *reply = l.lockMap[args.LockArgs.Resource]; !*reply { // No lock is held on the given name
-		return fmt.Errorf("Unlock attempted on an unlocked entity: %s", args.LockArgs.Resource)
+	if lri, reply = l.lockMap[args.Resource]; !reply {
+		// No lock is held on the given name
+		return reply, fmt.Errorf("Unlock attempted on an unlocked entity: %s", args.Resource)
 	}
-	if *reply = isWriteLock(lri); !*reply { // Unless it is a write lock
-		return fmt.Errorf("Unlock attempted on a read locked entity: %s (%d read locks active)", args.LockArgs.Resource, len(lri))
+	if reply = isWriteLock(lri); !reply {
+		// Unless it is a write lock
+		return reply, fmt.Errorf("Unlock attempted on a read locked entity: %s (%d read locks active)", args.Resource, len(lri))
 	}
-	if !l.removeEntry(args.LockArgs.Resource, args.LockArgs.UID, &lri) {
-		return fmt.Errorf("Unlock unable to find corresponding lock for uid: %s", args.LockArgs.UID)
+	if !l.removeEntry(args.Resource, args.UID, &lri) {
+		return false, fmt.Errorf("Unlock unable to find corresponding lock for uid: %s", args.UID)
 	}
-	return nil
+	return true, nil
+
 }
 
-// RLock - rpc handler for read lock operation.
-func (l *lockServer) RLock(args *LockArgs, reply *bool) error {
+func (l *localLocker) RLock(args dsync.LockArgs) (reply bool, err error) {
 	l.mutex.Lock()
 	defer l.mutex.Unlock()
-	if err := args.IsAuthenticated(); err != nil {
-		return err
-	}
 	lrInfo := lockRequesterInfo{
 		writer:          false,
-		node:            args.LockArgs.ServerAddr,
-		serviceEndpoint: args.LockArgs.ServiceEndpoint,
-		uid:             args.LockArgs.UID,
+		node:            args.ServerAddr,
+		serviceEndpoint: args.ServiceEndpoint,
+		uid:             args.UID,
 		timestamp:       UTCNow(),
 		timeLastCheck:   UTCNow(),
 	}
-	if lri, ok := l.lockMap[args.LockArgs.Resource]; ok {
-		if *reply = !isWriteLock(lri); *reply { // Unless there is a write lock
-			l.lockMap[args.LockArgs.Resource] = append(l.lockMap[args.LockArgs.Resource], lrInfo)
+	if lri, ok := l.lockMap[args.Resource]; ok {
+		if reply = !isWriteLock(lri); reply {
+			// Unless there is a write lock
+			l.lockMap[args.Resource] = append(l.lockMap[args.Resource], lrInfo)
 		}
-	} else { // No locks held on the given name, so claim (first) read lock
-		l.lockMap[args.LockArgs.Resource] = []lockRequesterInfo{lrInfo}
-		*reply = true
+	} else {
+		// No locks held on the given name, so claim (first) read lock
+		l.lockMap[args.Resource] = []lockRequesterInfo{lrInfo}
+		reply = true
 	}
-	return nil
+	return reply, nil
+}
+
+func (l *localLocker) RUnlock(args dsync.LockArgs) (reply bool, err error) {
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+	var lri []lockRequesterInfo
+	if lri, reply = l.lockMap[args.Resource]; !reply {
+		// No lock is held on the given name
+		return reply, fmt.Errorf("RUnlock attempted on an unlocked entity: %s", args.Resource)
+	}
+	if reply = !isWriteLock(lri); !reply {
+		// A write-lock is held, cannot release a read lock
+		return reply, fmt.Errorf("RUnlock attempted on a write locked entity: %s", args.Resource)
+	}
+	if !l.removeEntry(args.Resource, args.UID, &lri) {
+		return false, fmt.Errorf("RUnlock unable to find corresponding read lock for uid: %s", args.UID)
+	}
+	return reply, nil
+}
+
+func (l *localLocker) ForceUnlock(args dsync.LockArgs) (reply bool, err error) {
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+	if len(args.UID) != 0 {
+		return false, fmt.Errorf("ForceUnlock called with non-empty UID: %s", args.UID)
+	}
+	if _, ok := l.lockMap[args.Resource]; ok {
+		// Only clear lock when it is taken
+		// Remove the lock (irrespective of write or read lock)
+		delete(l.lockMap, args.Resource)
+	}
+	return true, nil
+}
+
+///  Distributed lock handlers
+
+// Lock - rpc handler for (single) write lock operation.
+func (l *lockServer) Lock(args *LockArgs, reply *bool) (err error) {
+	if err = args.IsAuthenticated(); err != nil {
+		return err
+	}
+	*reply, err = l.ll.Lock(args.LockArgs)
+	return err
+}
+
+// Unlock - rpc handler for (single) write unlock operation.
+func (l *lockServer) Unlock(args *LockArgs, reply *bool) (err error) {
+	if err = args.IsAuthenticated(); err != nil {
+		return err
+	}
+	*reply, err = l.ll.Unlock(args.LockArgs)
+	return err
+}
+
+// RLock - rpc handler for read lock operation.
+func (l *lockServer) RLock(args *LockArgs, reply *bool) (err error) {
+	if err = args.IsAuthenticated(); err != nil {
+		return err
+	}
+	*reply, err = l.ll.RLock(args.LockArgs)
+	return err
 }
 
 // RUnlock - rpc handler for read unlock operation.
-func (l *lockServer) RUnlock(args *LockArgs, reply *bool) error {
-	l.mutex.Lock()
-	defer l.mutex.Unlock()
-	if err := args.IsAuthenticated(); err != nil {
+func (l *lockServer) RUnlock(args *LockArgs, reply *bool) (err error) {
+	if err = args.IsAuthenticated(); err != nil {
 		return err
 	}
-	var lri []lockRequesterInfo
-	if lri, *reply = l.lockMap[args.LockArgs.Resource]; !*reply { // No lock is held on the given name
-		return fmt.Errorf("RUnlock attempted on an unlocked entity: %s", args.LockArgs.Resource)
-	}
-	if *reply = !isWriteLock(lri); !*reply { // A write-lock is held, cannot release a read lock
-		return fmt.Errorf("RUnlock attempted on a write locked entity: %s", args.LockArgs.Resource)
-	}
-	if !l.removeEntry(args.LockArgs.Resource, args.LockArgs.UID, &lri) {
-		return fmt.Errorf("RUnlock unable to find corresponding read lock for uid: %s", args.LockArgs.UID)
-	}
-	return nil
+	*reply, err = l.ll.RUnlock(args.LockArgs)
+	return err
 }
 
 // ForceUnlock - rpc handler for force unlock operation.
-func (l *lockServer) ForceUnlock(args *LockArgs, reply *bool) error {
-	l.mutex.Lock()
-	defer l.mutex.Unlock()
-	if err := args.IsAuthenticated(); err != nil {
+func (l *lockServer) ForceUnlock(args *LockArgs, reply *bool) (err error) {
+	if err = args.IsAuthenticated(); err != nil {
 		return err
 	}
-	if len(args.LockArgs.UID) != 0 {
-		return fmt.Errorf("ForceUnlock called with non-empty UID: %s", args.LockArgs.UID)
-	}
-	if _, ok := l.lockMap[args.LockArgs.Resource]; ok { // Only clear lock when set
-		delete(l.lockMap, args.LockArgs.Resource) // Remove the lock (irrespective of write or read lock)
-	}
-	*reply = true
-	return nil
+	*reply, err = l.ll.ForceUnlock(args.LockArgs)
+	return err
 }
 
 // Expired - rpc handler for expired lock status.
 func (l *lockServer) Expired(args *LockArgs, reply *bool) error {
-	l.mutex.Lock()
-	defer l.mutex.Unlock()
 	if err := args.IsAuthenticated(); err != nil {
 		return err
 	}
+	l.ll.mutex.Lock()
+	defer l.ll.mutex.Unlock()
 	// Lock found, proceed to verify if belongs to given uid.
-	if lri, ok := l.lockMap[args.LockArgs.Resource]; ok {
+	if lri, ok := l.ll.lockMap[args.LockArgs.Resource]; ok {
 		// Check whether uid is still active
 		for _, entry := range lri {
 			if entry.uid == args.LockArgs.UID {
@@ -277,10 +305,10 @@ type nameLockRequesterInfoPair struct {
 //
 // We will ignore the error, and we will retry later to get a resolve on this lock
 func (l *lockServer) lockMaintenance(interval time.Duration) {
-	l.mutex.Lock()
+	l.ll.mutex.Lock()
 	// Get list of long lived locks to check for staleness.
-	nlripLongLived := getLongLivedLocks(l.lockMap, interval)
-	l.mutex.Unlock()
+	nlripLongLived := getLongLivedLocks(l.ll.lockMap, interval)
+	l.ll.mutex.Unlock()
 
 	serverCred := serverConfig.GetCredential()
 	// Validate if long lived locks are indeed clean.
@@ -308,9 +336,9 @@ func (l *lockServer) lockMaintenance(interval time.Duration) {
 		if expired {
 			// The lock is no longer active at server that originated the lock
 			// So remove the lock from the map.
-			l.mutex.Lock()
-			l.removeEntryIfExists(nlrip) // Purge the stale entry if it exists.
-			l.mutex.Unlock()
+			l.ll.mutex.Lock()
+			l.ll.removeEntryIfExists(nlrip) // Purge the stale entry if it exists.
+			l.ll.mutex.Unlock()
 		}
 	}
 }

cmd/lock-rpc-server_test.go

@@ -49,10 +49,12 @@ func createLockTestServer(t *testing.T) (string, *lockServer, string) {
 	}
 
 	locker := &lockServer{
-		AuthRPCServer:   AuthRPCServer{},
-		serviceEndpoint: "rpc-path",
-		mutex:           sync.Mutex{},
-		lockMap:         make(map[string][]lockRequesterInfo),
+		AuthRPCServer: AuthRPCServer{},
+		ll: localLocker{
+			mutex:           sync.Mutex{},
+			serviceEndpoint: "rpc-path",
+			lockMap:         make(map[string][]lockRequesterInfo),
+		},
 	}
 	creds := serverConfig.GetCredential()
 	loginArgs := LoginRPCArgs{
@@ -93,7 +95,7 @@ func TestLockRpcServerLock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.lockMap["name"]
+			gotLri, _ := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo{
 				{
 					writer:          true,
@@ -163,7 +165,7 @@ func TestLockRpcServerUnlock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.lockMap["name"]
+			gotLri, _ := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo(nil)
 			if !testLockEquality(expectedLri, gotLri) {
 				t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -194,7 +196,7 @@ func TestLockRpcServerRLock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.lockMap["name"]
+			gotLri, _ := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo{
 				{
 					writer:          false,
@@ -281,7 +283,7 @@ func TestLockRpcServerRUnlock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.lockMap["name"]
+			gotLri, _ := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo{
 				{
 					writer:          false,
@@ -305,7 +307,7 @@ func TestLockRpcServerRUnlock(t *testing.T) {
 		if !result {
 			t.Errorf("Expected %#v, got %#v", true, result)
 		} else {
-			gotLri, _ := locker.lockMap["name"]
+			gotLri, _ := locker.ll.lockMap["name"]
 			expectedLri := []lockRequesterInfo(nil)
 			if !testLockEquality(expectedLri, gotLri) {
 				t.Errorf("Expected %#v, got %#v", expectedLri, gotLri)
@@ -427,6 +429,12 @@ func TestLockServers(t *testing.T) {
 		return
 	}
 
+	rootPath, err := newTestConfig(globalMinioDefaultRegion)
+	if err != nil {
+		t.Fatalf("Init Test config failed")
+	}
+	defer removeAll(rootPath)
+
 	currentIsDistXL := globalIsDistXL
 	defer func() {
 		globalIsDistXL = currentIsDistXL
@@ -471,9 +479,13 @@ func TestLockServers(t *testing.T) {
 	// Validates lock server initialization.
 	for i, testCase := range testCases {
 		globalIsDistXL = testCase.isDistXL
-		lockServers := newLockServers(testCase.endpoints)
-		if len(lockServers) != testCase.totalLockServers {
-			t.Fatalf("Test %d: Expected total %d, got %d", i+1, testCase.totalLockServers, len(lockServers))
+		globalLockServers = nil
+		_, _ = newDsyncNodes(testCase.endpoints)
+		if err != nil {
+			t.Fatalf("Got unexpected error initializing lock servers: %v", err)
+		}
+		if len(globalLockServers) != testCase.totalLockServers {
+			t.Fatalf("Test %d: Expected total %d, got %d", i+1, testCase.totalLockServers, len(globalLockServers))
 		}
 	}
 }

cmd/main.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"os"
+	"path/filepath"
 	"sort"
 
 	"github.com/minio/cli"
@@ -59,7 +60,7 @@ VERSION:
   ` + Version +
 	`{{ "\n"}}`
 
-func newApp() *cli.App {
+func newApp(name string) *cli.App {
 	// Collection of minio commands currently supported are.
 	commands := []cli.Command{}
 
@@ -108,7 +109,7 @@ func newApp() *cli.App {
 	}
 
 	app := cli.NewApp()
-	app.Name = "Minio"
+	app.Name = name
 	app.Author = "Minio.io"
 	app.Version = Version
 	app.Usage = "Cloud Storage Server."
@@ -137,10 +138,11 @@ func newApp() *cli.App {
 
 // Main main for minio server.
 func Main(args []string) {
-	app := newApp()
+	// Set the minio app name.
+	appName := filepath.Base(args[0])
 
 	// Run the app - exit on error.
-	if err := app.Run(args); err != nil {
+	if err := newApp(appName).Run(args); err != nil {
 		os.Exit(1)
 	}
 }

cmd/namespace-lock.go

@@ -27,6 +27,9 @@ import (
 // Global name space lock.
 var globalNSMutex *nsLockMap
 
+// Global lock servers
+var globalLockServers []*lockServer
+
 // RWLocker - locker interface extends sync.Locker
 // to introduce RLock, RUnlock.
 type RWLocker interface {
@@ -36,27 +39,45 @@ type RWLocker interface {
 }
 
 // Initialize distributed locking only in case of distributed setup.
-// Returns if the setup is distributed or not on success.
-func initDsyncNodes() error {
+// Returns lock clients and the node index for the current server.
+func newDsyncNodes(endpoints EndpointList) (clnts []dsync.NetLocker, myNode int) {
 	cred := serverConfig.GetCredential()
-	// Initialize rpc lock client information only if this instance is a distributed setup.
-	clnts := make([]dsync.NetLocker, len(globalEndpoints))
-	myNode := -1
-	for index, endpoint := range globalEndpoints {
-		clnts[index] = newLockRPCClient(authConfig{
-			accessKey:       cred.AccessKey,
-			secretKey:       cred.SecretKey,
-			serverAddr:      endpoint.Host,
-			secureConn:      globalIsSSL,
-			serviceEndpoint: pathutil.Join(minioReservedBucketPath, lockServicePath, endpoint.Path),
-			serviceName:     lockServiceName,
-		})
-		if endpoint.IsLocal && myNode == -1 {
+	clnts = make([]dsync.NetLocker, len(endpoints))
+	myNode = -1
+	for index, endpoint := range endpoints {
+		if !endpoint.IsLocal {
+			// For a remote endpoints setup a lock RPC client.
+			clnts[index] = newLockRPCClient(authConfig{
+				accessKey:       cred.AccessKey,
+				secretKey:       cred.SecretKey,
+				serverAddr:      endpoint.Host,
+				secureConn:      globalIsSSL,
+				serviceEndpoint: pathutil.Join(minioReservedBucketPath, lockServicePath, endpoint.Path),
+				serviceName:     lockServiceName,
+			})
+			continue
+		}
+
+		// Local endpoint
+		if myNode == -1 {
 			myNode = index
 		}
+		// For a local endpoint, setup a local lock server to
+		// avoid network requests.
+		localLockServer := lockServer{
+			AuthRPCServer: AuthRPCServer{},
+			ll: localLocker{
+				mutex:           sync.Mutex{},
+				serviceEndpoint: endpoint.Path,
+				serverAddr:      endpoint.Host,
+				lockMap:         make(map[string][]lockRequesterInfo),
+			},
+		}
+		globalLockServers = append(globalLockServers, &localLockServer)
+		clnts[index] = &(localLockServer.ll)
 	}
 
-	return dsync.Init(clnts, myNode)
+	return clnts, myNode
 }
 
 // initNSLock - initialize name space lock map.
@@ -240,14 +261,12 @@ func (n *nsLockMap) ForceUnlock(volume, path string) {
 	if _, found := n.lockMap[param]; found {
 		// Remove lock from the map.
 		delete(n.lockMap, param)
-
-		// delete the lock state entry for given
-		// <volume, path> pair.
-		err := n.deleteLockInfoEntryForVolumePath(param)
-		if err != nil {
-			errorIf(err, "Failed to delete lock info entry")
-		}
 	}
+
+	// delete the lock state entry for given
+	// <volume, path> pair. Ignore error as there
+	// is no way to report it back
+	n.deleteLockInfoEntryForVolumePath(param)
 }
 
 // lockInstance - frontend/top-level interface for namespace locks.

cmd/naughty-disk_test.go

@@ -122,6 +122,15 @@ func (d *naughtyDisk) ReadFile(volume string, path string, offset int64, buf []b
 	return d.disk.ReadFile(volume, path, offset, buf)
 }
 
+func (d *naughtyDisk) ReadFileWithVerify(volume, path string, offset int64,
+	buf []byte, algo HashAlgo, expectedHash string) (n int64, err error) {
+
+	if err := d.calcError(); err != nil {
+		return 0, err
+	}
+	return d.disk.ReadFileWithVerify(volume, path, offset, buf, algo, expectedHash)
+}
+
 func (d *naughtyDisk) PrepareFile(volume, path string, length int64) error {
 	if err := d.calcError(); err != nil {
 		return err

cmd/net.go

@@ -17,11 +17,14 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"net"
+	"net/url"
 	"os"
 	"sort"
 	"strconv"
+	"strings"
 	"syscall"
 
 	"github.com/minio/minio-go/pkg/set"
@@ -186,6 +189,121 @@ func checkPortAvailability(port string) (err error) {
 	return nil
 }
 
+// extractHostPort - extracts host/port from many address formats
+// such as, ":9000", "localhost:9000", "http://localhost:9000/"
+func extractHostPort(hostAddr string) (string, string, error) {
+	var addr, scheme string
+
+	if hostAddr == "" {
+		return "", "", errors.New("unable to process empty address")
+	}
+
+	// Parse address to extract host and scheme field
+	u, err := url.Parse(hostAddr)
+	if err != nil {
+		// Ignore scheme not present error
+		if !strings.Contains(err.Error(), "missing protocol scheme") {
+			return "", "", err
+		}
+	} else {
+		addr = u.Host
+		scheme = u.Scheme
+	}
+
+	// Use the given parameter again if url.Parse()
+	// didn't return any useful result.
+	if addr == "" {
+		addr = hostAddr
+		scheme = "http"
+	}
+
+	// At this point, addr can be one of the following form:
+	//	":9000"
+	//	"localhost:9000"
+	//	"localhost" <- in this case, we check for scheme
+
+	host, port, err := net.SplitHostPort(addr)
+	if err != nil {
+		if !strings.Contains(err.Error(), "missing port in address") {
+			return "", "", err
+		}
+
+		host = addr
+
+		switch scheme {
+		case "https":
+			port = "443"
+		case "http":
+			port = "80"
+		default:
+			return "", "", errors.New("unable to guess port from scheme")
+		}
+	}
+
+	return host, port, nil
+}
+
+// isLocalHost - checks if the given parameter
+// correspond to one of the local IP of the
+// current machine
+func isLocalHost(host string) (bool, error) {
+	hostIPs, err := getHostIP4(host)
+	if err != nil {
+		return false, err
+	}
+
+	// If intersection of two IP sets is not empty, then the host is local host.
+	isLocal := !localIP4.Intersection(hostIPs).IsEmpty()
+	return isLocal, nil
+}
+
+// sameLocalAddrs - returns true if two addresses, even with different
+// formats, point to the same machine, e.g:
+//   ':9000' and 'http://localhost:9000/' will return true
+func sameLocalAddrs(addr1, addr2 string) (bool, error) {
+
+	// Extract host & port from given parameters
+	host1, port1, err := extractHostPort(addr1)
+	if err != nil {
+		return false, err
+	}
+	host2, port2, err := extractHostPort(addr2)
+	if err != nil {
+		return false, err
+	}
+
+	var addr1Local, addr2Local bool
+
+	if host1 == "" {
+		// If empty host means it is localhost
+		addr1Local = true
+	} else {
+		// Host not empty, check if it is local
+		if addr1Local, err = isLocalHost(host1); err != nil {
+			return false, err
+		}
+	}
+
+	if host2 == "" {
+		// If empty host means it is localhost
+		addr2Local = true
+	} else {
+		// Host not empty, check if it is local
+		if addr2Local, err = isLocalHost(host2); err != nil {
+			return false, err
+		}
+	}
+
+	// If both of addresses point to the same machine, check if
+	// have the same port
+	if addr1Local && addr2Local {
+		if port1 == port2 {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
 // CheckLocalServerAddr - checks if serverAddr is valid and local host.
 func CheckLocalServerAddr(serverAddr string) error {
 	host, port, err := net.SplitHostPort(serverAddr)
@@ -201,13 +319,15 @@ func CheckLocalServerAddr(serverAddr string) error {
 		return fmt.Errorf("port number must be between 1 to 65535")
 	}
 
-	if host != "" {
-		hostIPs, err := getHostIP4(host)
+	// 0.0.0.0 is a wildcard address and refers to local network
+	// addresses. I.e, 0.0.0.0:9000 like ":9000" refers to port
+	// 9000 on localhost.
+	if host != "" && host != net.IPv4zero.String() {
+		isLocalHost, err := isLocalHost(host)
 		if err != nil {
 			return err
 		}
-
-		if localIP4.Intersection(hostIPs).IsEmpty() {
+		if !isLocalHost {
 			return fmt.Errorf("host in server address should be this server")
 		}
 	}

cmd/net_test.go

@@ -17,6 +17,7 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"reflect"
@@ -220,6 +221,7 @@ func TestCheckLocalServerAddr(t *testing.T) {
 	}{
 		{":54321", nil},
 		{"localhost:54321", nil},
+		{"0.0.0.0:9000", nil},
 		{"", fmt.Errorf("missing port in address")},
 		{"localhost", fmt.Errorf("missing port in address localhost")},
 		{"example.org:54321", fmt.Errorf("host in server address should be this server")},
@@ -240,3 +242,77 @@ func TestCheckLocalServerAddr(t *testing.T) {
 		}
 	}
 }
+
+func TestExtractHostPort(t *testing.T) {
+	testCases := []struct {
+		addr        string
+		host        string
+		port        string
+		expectedErr error
+	}{
+		{"", "", "", errors.New("unable to process empty address")},
+		{"localhost", "localhost", "80", nil},
+		{"localhost:9000", "localhost", "9000", nil},
+		{"http://:9000/", "", "9000", nil},
+		{"http://8.8.8.8:9000/", "8.8.8.8", "9000", nil},
+		{"https://facebook.com:9000/", "facebook.com", "9000", nil},
+	}
+
+	for i, testCase := range testCases {
+		host, port, err := extractHostPort(testCase.addr)
+		if testCase.expectedErr == nil {
+			if err != nil {
+				t.Fatalf("Test %d: should succeed but failed with err: %v", i+1, err)
+			}
+			if host != testCase.host {
+				t.Fatalf("Test %d: expected: %v, found: %v", i+1, testCase.host, host)
+			}
+			if port != testCase.port {
+				t.Fatalf("Test %d: expected: %v, found: %v", i+1, testCase.port, port)
+			}
+
+		}
+		if testCase.expectedErr != nil {
+			if err == nil {
+				t.Fatalf("Test %d:, should fail but succeeded.", i+1)
+			}
+			if testCase.expectedErr.Error() != err.Error() {
+				t.Fatalf("Test %d: failed with different error, expected: '%v', found:'%v'.", i+1, testCase.expectedErr, err)
+			}
+		}
+	}
+}
+
+func TestSameLocalAddrs(t *testing.T) {
+	testCases := []struct {
+		addr1       string
+		addr2       string
+		sameAddr    bool
+		expectedErr error
+	}{
+		{"", "", false, errors.New("unable to process empty address")},
+		{":9000", ":9000", true, nil},
+		{"localhost:9000", ":9000", true, nil},
+		{"localhost:9000", "http://localhost:9000", true, nil},
+		{"8.8.8.8:9000", "http://localhost:9000", false, nil},
+	}
+
+	for i, testCase := range testCases {
+		sameAddr, err := sameLocalAddrs(testCase.addr1, testCase.addr2)
+		if testCase.expectedErr != nil && err == nil {
+			t.Fatalf("Test %d: should fail but succeeded", i+1)
+		}
+		if testCase.expectedErr == nil && err != nil {
+			t.Fatalf("Test %d: should succeed but failed with %v", i+1, err)
+		}
+		if err == nil {
+			if sameAddr != testCase.sameAddr {
+				t.Fatalf("Test %d: expected: %v, found: %v", i+1, testCase.sameAddr, sameAddr)
+			}
+		} else {
+			if err.Error() != testCase.expectedErr.Error() {
+				t.Fatalf("Test %d: failed with different error, expected: '%v', found:'%v'.", i+1, testCase.expectedErr, err)
+			}
+		}
+	}
+}

cmd/object-api-common.go

@@ -32,8 +32,8 @@ const (
 	// Buckets meta prefix.
 	bucketMetaPrefix = "buckets"
 
-	// Md5Sum of empty string.
-	emptyStrMd5Sum = "d41d8cd98f00b204e9800998ecf8427e"
+	// ETag (hex encoded md5sum) of empty string.
+	emptyETag = "d41d8cd98f00b204e9800998ecf8427e"
 )
 
 // Global object layer mutex, used for safely updating object layer.
@@ -65,10 +65,10 @@ func dirObjectInfo(bucket, object string, size int64, metadata map[string]string
 	// This is a special case with size as '0' and object ends with
 	// a slash separator, we treat it like a valid operation and
 	// return success.
-	md5Sum := metadata["md5Sum"]
-	delete(metadata, "md5Sum")
-	if md5Sum == "" {
-		md5Sum = emptyStrMd5Sum
+	etag := metadata["etag"]
+	delete(metadata, "etag")
+	if etag == "" {
+		etag = emptyETag
 	}
 
 	return ObjectInfo{
@@ -78,7 +78,7 @@ func dirObjectInfo(bucket, object string, size int64, metadata map[string]string
 		ContentType: "application/octet-stream",
 		IsDir:       true,
 		Size:        size,
-		MD5Sum:      md5Sum,
+		ETag:        etag,
 		UserDefined: metadata,
 	}
 }

cmd/object-api-datatypes.go

@@ -101,8 +101,8 @@ type ObjectInfo struct {
 	// IsDir indicates if the object is prefix.
 	IsDir bool
 
-	// Hex encoded md5 checksum of the object.
-	MD5Sum string
+	// Hex encoded unique entity tag of the object.
+	ETag string
 
 	// A standard MIME type describing the format of the object.
 	ContentType string

cmd/object-api-getobject_test.go

@@ -39,7 +39,7 @@ func testGetObject(obj ObjectLayer, instanceType string, t TestErrHandler) {
 	bucketName := getRandomBucketName()
 	objectName := "test-object"
 	// create bucket.
-	err := obj.MakeBucket(bucketName)
+	err := obj.MakeBucketWithLocation(bucketName, "")
 	// Stop the test if creation of the bucket fails.
 	if err != nil {
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -192,7 +192,7 @@ func testGetObjectPermissionDenied(obj ObjectLayer, instanceType string, disks [
 	// Setup for the tests.
 	bucketName := getRandomBucketName()
 	// create bucket.
-	err := obj.MakeBucket(bucketName)
+	err := obj.MakeBucketWithLocation(bucketName, "")
 	// Stop the test if creation of the bucket fails.
 	if err != nil {
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -303,7 +303,7 @@ func testGetObjectDiskNotFound(obj ObjectLayer, instanceType string, disks []str
 	bucketName := getRandomBucketName()
 	objectName := "test-object"
 	// create bucket.
-	err := obj.MakeBucket(bucketName)
+	err := obj.MakeBucketWithLocation(bucketName, "")
 	// Stop the test if creation of the bucket fails.
 	if err != nil {
 		t.Fatalf("%s : %s", instanceType, err.Error())

cmd/object-api-getobjectinfo_test.go

@@ -29,7 +29,7 @@ func TestGetObjectInfo(t *testing.T) {
 // Testing GetObjectInfo().
 func testGetObjectInfo(obj ObjectLayer, instanceType string, t TestErrHandler) {
 	// This bucket is used for testing getObjectInfo operations.
-	err := obj.MakeBucket("test-getobjectinfo")
+	err := obj.MakeBucketWithLocation("test-getobjectinfo", "")
 	if err != nil {
 		t.Fatalf("%s : %s", instanceType, err.Error())
 	}
@@ -69,8 +69,8 @@ func testGetObjectInfo(obj ObjectLayer, instanceType string, t TestErrHandler) {
 		{"test-getobjectinfo", "Antartica", ObjectInfo{}, ObjectNotFound{Bucket: "test-getobjectinfo", Object: "Antartica"}, false},
 		{"test-getobjectinfo", "Asia/myfile", ObjectInfo{}, ObjectNotFound{Bucket: "test-getobjectinfo", Object: "Asia/myfile"}, false},
 		// Test case with existing bucket but object name set to a directory (Test number 12).
-		{"test-getobjectinfo", "Asia", ObjectInfo{}, ObjectNotFound{Bucket: "test-getobjectinfo", Object: "Asia"}, false},
-		// Valid case with existing object (Test number 13).
+		{"test-getobjectinfo", "Asia/", ObjectInfo{}, ObjectNotFound{Bucket: "test-getobjectinfo", Object: "Asia/"}, false},
+		// Valid case with existing object (Test number 14).
 		{"test-getobjectinfo", "Asia/asiapics.jpg", resultCases[0], nil, true},
 	}
 	for i, testCase := range testCases {

cmd/object-api-input-checks.go

@@ -36,6 +36,10 @@ func checkBucketAndObjectNames(bucket, object string) error {
 	}
 	// Verify if object is valid.
 	if !IsValidObjectName(object) {
+		// Objects with "/" are invalid, verify to return a different error.
+		if hasSuffix(object, slashSeparator) || hasPrefix(object, slashSeparator) {
+			return traceError(ObjectNotFound{Bucket: bucket, Object: object})
+		}
 		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
 	}
 	return nil

cmd/object-api-interface.go

@@ -25,7 +25,7 @@ type ObjectLayer interface {
 	StorageInfo() StorageInfo
 
 	// Bucket operations.
-	MakeBucket(bucket string) error
+	MakeBucketWithLocation(bucket string, location string) error
 	GetBucketInfo(bucket string) (bucketInfo BucketInfo, err error)
 	ListBuckets() (buckets []BucketInfo, err error)
 	DeleteBucket(bucket string) error

cmd/object-api-listobjects_test.go

@@ -41,7 +41,7 @@ func testListObjects(obj ObjectLayer, instanceType string, t TestErrHandler) {
 		"empty-bucket",
 	}
 	for _, bucket := range testBuckets {
-		err := obj.MakeBucket(bucket)
+		err := obj.MakeBucketWithLocation(bucket, "")
 		if err != nil {
 			t.Fatalf("%s : %s", instanceType, err.Error())
 		}
@@ -549,7 +549,7 @@ func testListObjects(obj ObjectLayer, instanceType string, t TestErrHandler) {
 				if testCase.result.Objects[j].Name != result.Objects[j].Name {
 					t.Errorf("Test %d: %s: Expected object name to be \"%s\", but found \"%s\" instead", i+1, instanceType, testCase.result.Objects[j].Name, result.Objects[j].Name)
 				}
-				if result.Objects[j].MD5Sum == "" {
+				if result.Objects[j].ETag == "" {
 					t.Errorf("Test %d: %s: Expected md5sum to be not empty, but found empty instead", i+1, instanceType)
 				}
 
@@ -599,7 +599,7 @@ func BenchmarkListObjects(b *testing.B) {
 
 	bucket := "ls-benchmark-bucket"
 	// Create a bucket.
-	err = obj.MakeBucket(bucket)
+	err = obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		b.Fatal(err)
 	}

cmd/object-api-multipart_test.go

@@ -52,7 +52,7 @@ func testObjectNewMultipartUpload(obj ObjectLayer, instanceType string, t TestEr
 	}
 
 	// Create bucket before intiating NewMultipartUpload.
-	err = obj.MakeBucket(bucket)
+	err = obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -91,7 +91,7 @@ func testObjectAbortMultipartUpload(obj ObjectLayer, instanceType string, t Test
 	object := "minio-object"
 
 	// Create bucket before intiating NewMultipartUpload.
-	err := obj.MakeBucket(bucket)
+	err := obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -137,7 +137,7 @@ func testObjectAPIIsUploadIDExists(obj ObjectLayer, instanceType string, t TestE
 	object := "minio-object"
 
 	// Create bucket before intiating NewMultipartUpload.
-	err := obj.MakeBucket(bucket)
+	err := obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -173,7 +173,7 @@ func testPutObjectPartDiskNotFound(obj ObjectLayer, instanceType string, disks [
 	// objectNames[0].
 	// uploadIds [0].
 	// Create bucket before intiating NewMultipartUpload.
-	err := obj.MakeBucket(bucketNames[0])
+	err := obj.MakeBucketWithLocation(bucketNames[0], "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -253,7 +253,7 @@ func testObjectAPIPutObjectPart(obj ObjectLayer, instanceType string, t TestErrH
 	object := "minio-object"
 
 	// Create bucket before intiating NewMultipartUpload.
-	err := obj.MakeBucket(bucket)
+	err := obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -265,7 +265,7 @@ func testObjectAPIPutObjectPart(obj ObjectLayer, instanceType string, t TestErrH
 		t.Fatalf("%s : %s", instanceType, err.Error())
 	}
 	// Creating a dummy bucket for tests.
-	err = obj.MakeBucket("unused-bucket")
+	err = obj.MakeBucketWithLocation("unused-bucket", "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -386,7 +386,7 @@ func testListMultipartUploads(obj ObjectLayer, instanceType string, t TestErrHan
 	// objectNames[0].
 	// uploadIds [0].
 	// Create bucket before initiating NewMultipartUpload.
-	err := obj.MakeBucket(bucketNames[0])
+	err := obj.MakeBucketWithLocation(bucketNames[0], "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -404,7 +404,7 @@ func testListMultipartUploads(obj ObjectLayer, instanceType string, t TestErrHan
 	// objectNames[0].
 	// uploadIds [1-3].
 	// Bucket to test for mutiple upload Id's for a given object.
-	err = obj.MakeBucket(bucketNames[1])
+	err = obj.MakeBucketWithLocation(bucketNames[1], "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -425,7 +425,7 @@ func testListMultipartUploads(obj ObjectLayer, instanceType string, t TestErrHan
 	// bucketnames[2].
 	// objectNames[0-2].
 	// uploadIds [4-9].
-	err = obj.MakeBucket(bucketNames[2])
+	err = obj.MakeBucketWithLocation(bucketNames[2], "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -1288,7 +1288,7 @@ func testListObjectPartsDiskNotFound(obj ObjectLayer, instanceType string, disks
 	// objectNames[0].
 	// uploadIds [0].
 	// Create bucket before intiating NewMultipartUpload.
-	err := obj.MakeBucket(bucketNames[0])
+	err := obj.MakeBucketWithLocation(bucketNames[0], "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -1531,7 +1531,7 @@ func testListObjectParts(obj ObjectLayer, instanceType string, t TestErrHandler)
 	// objectNames[0].
 	// uploadIds [0].
 	// Create bucket before intiating NewMultipartUpload.
-	err := obj.MakeBucket(bucketNames[0])
+	err := obj.MakeBucketWithLocation(bucketNames[0], "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -1769,7 +1769,7 @@ func testObjectCompleteMultipartUpload(obj ObjectLayer, instanceType string, t T
 	// objectNames[0].
 	// uploadIds [0].
 	// Create bucket before intiating NewMultipartUpload.
-	err = obj.MakeBucket(bucketNames[0])
+	err = obj.MakeBucketWithLocation(bucketNames[0], "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err)
@@ -1782,8 +1782,8 @@ func testObjectCompleteMultipartUpload(obj ObjectLayer, instanceType string, t T
 	}
 
 	uploadIDs = append(uploadIDs, uploadID)
-	// Parts with size greater than 5 MB.
-	// Generating a 6MB byte array.
+	// Parts with size greater than 5 MiB.
+	// Generating a 6MiB byte array.
 	validPart := bytes.Repeat([]byte("abcdef"), 1*humanize.MiByte)
 	validPartMD5 := getMD5Hash(validPart)
 	// Create multipart parts.
@@ -1930,7 +1930,7 @@ func testObjectCompleteMultipartUpload(obj ObjectLayer, instanceType string, t T
 		if actualErr == nil && testCase.shouldPass {
 
 			// Asserting IsTruncated.
-			if actualResult.MD5Sum != testCase.expectedS3MD5 {
+			if actualResult.ETag != testCase.expectedS3MD5 {
 				t.Errorf("Test %d: %s: Expected the result to be \"%v\", but found it to \"%v\"", i+1, instanceType, testCase.expectedS3MD5, actualResult)
 			}
 		}

cmd/object-api-putobject_test.go

@@ -29,7 +29,7 @@ import (
 )
 
 func md5Header(data []byte) map[string]string {
-	return map[string]string{"md5Sum": getMD5Hash([]byte(data))}
+	return map[string]string{"etag": getMD5Hash([]byte(data))}
 }
 
 // Wrapper for calling PutObject tests for both XL multiple disks and single node setup.
@@ -44,14 +44,14 @@ func testObjectAPIPutObject(obj ObjectLayer, instanceType string, t TestErrHandl
 	object := "minio-object"
 
 	// Create bucket.
-	err := obj.MakeBucket(bucket)
+	err := obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
 	}
 
 	// Creating a dummy bucket for tests.
-	err = obj.MakeBucket("unused-bucket")
+	err = obj.MakeBucketWithLocation("unused-bucket", "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -94,29 +94,29 @@ func testObjectAPIPutObject(obj ObjectLayer, instanceType string, t TestErrHandl
 
 		// Test case - 7.
 		// Input to replicate Md5 mismatch.
-		{bucket, object, []byte(""), map[string]string{"md5Sum": "a35"}, "", 0, "",
+		{bucket, object, []byte(""), map[string]string{"etag": "a35"}, "", 0, "",
 			BadDigest{ExpectedMD5: "a35", CalculatedMD5: "d41d8cd98f00b204e9800998ecf8427e"}},
 
 		// Test case - 8.
 		// With incorrect sha256.
-		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "e2fc714c4727ee9395f324cd2e7f331f"}, "incorrect-sha256", int64(len("abcd")), "", SHA256Mismatch{}},
+		{bucket, object, []byte("abcd"), map[string]string{"etag": "e2fc714c4727ee9395f324cd2e7f331f"}, "incorrect-sha256", int64(len("abcd")), "", SHA256Mismatch{}},
 
 		// Test case - 9.
 		// Input with size more than the size of actual data inside the reader.
-		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "a35"}, "", int64(len("abcd") + 1), "",
+		{bucket, object, []byte("abcd"), map[string]string{"etag": "a35"}, "", int64(len("abcd") + 1), "",
 			IncompleteBody{}},
 
 		// Test case - 10.
 		// Input with size less than the size of actual data inside the reader.
-		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "a35"}, "", int64(len("abcd") - 1), "",
+		{bucket, object, []byte("abcd"), map[string]string{"etag": "a35"}, "", int64(len("abcd") - 1), "",
 			BadDigest{ExpectedMD5: "a35", CalculatedMD5: "900150983cd24fb0d6963f7d28e17f72"}},
 
 		// Test case - 11-14.
 		// Validating for success cases.
-		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "e2fc714c4727ee9395f324cd2e7f331f"}, "", int64(len("abcd")), "", nil},
-		{bucket, object, []byte("efgh"), map[string]string{"md5Sum": "1f7690ebdd9b4caf8fab49ca1757bf27"}, "", int64(len("efgh")), "", nil},
-		{bucket, object, []byte("ijkl"), map[string]string{"md5Sum": "09a0877d04abf8759f99adec02baf579"}, "", int64(len("ijkl")), "", nil},
-		{bucket, object, []byte("mnop"), map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"}, "", int64(len("mnop")), "", nil},
+		{bucket, object, []byte("abcd"), map[string]string{"etag": "e2fc714c4727ee9395f324cd2e7f331f"}, "", int64(len("abcd")), "", nil},
+		{bucket, object, []byte("efgh"), map[string]string{"etag": "1f7690ebdd9b4caf8fab49ca1757bf27"}, "", int64(len("efgh")), "", nil},
+		{bucket, object, []byte("ijkl"), map[string]string{"etag": "09a0877d04abf8759f99adec02baf579"}, "", int64(len("ijkl")), "", nil},
+		{bucket, object, []byte("mnop"), map[string]string{"etag": "e132e96a5ddad6da8b07bba6f6131fef"}, "", int64(len("mnop")), "", nil},
 
 		// Test case 15-17.
 		// With no metadata
@@ -169,8 +169,8 @@ func testObjectAPIPutObject(obj ObjectLayer, instanceType string, t TestErrHandl
 		// Test passes as expected, but the output values are verified for correctness here.
 		if actualErr == nil {
 			// Asserting whether the md5 output is correct.
-			if expectedMD5, ok := testCase.inputMeta["md5Sum"]; ok && expectedMD5 != objInfo.MD5Sum {
-				t.Errorf("Test %d: %s: Calculated Md5 different from the actual one %s.", i+1, instanceType, objInfo.MD5Sum)
+			if expectedMD5, ok := testCase.inputMeta["etag"]; ok && expectedMD5 != objInfo.ETag {
+				t.Errorf("Test %d: %s: Calculated Md5 different from the actual one %s.", i+1, instanceType, objInfo.ETag)
 			}
 		}
 	}
@@ -189,14 +189,14 @@ func testObjectAPIPutObjectDiskNotFound(obj ObjectLayer, instanceType string, di
 	object := "minio-object"
 
 	// Create bucket.
-	err := obj.MakeBucket(bucket)
+	err := obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
 	}
 
 	// Creating a dummy bucket for tests.
-	err = obj.MakeBucket("unused-bucket")
+	err = obj.MakeBucketWithLocation("unused-bucket", "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -220,10 +220,10 @@ func testObjectAPIPutObjectDiskNotFound(obj ObjectLayer, instanceType string, di
 		expectedError error
 	}{
 		// Validating for success cases.
-		{bucket, object, []byte("abcd"), map[string]string{"md5Sum": "e2fc714c4727ee9395f324cd2e7f331f"}, int64(len("abcd")), true, "", nil},
-		{bucket, object, []byte("efgh"), map[string]string{"md5Sum": "1f7690ebdd9b4caf8fab49ca1757bf27"}, int64(len("efgh")), true, "", nil},
-		{bucket, object, []byte("ijkl"), map[string]string{"md5Sum": "09a0877d04abf8759f99adec02baf579"}, int64(len("ijkl")), true, "", nil},
-		{bucket, object, []byte("mnop"), map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"}, int64(len("mnop")), true, "", nil},
+		{bucket, object, []byte("abcd"), map[string]string{"etag": "e2fc714c4727ee9395f324cd2e7f331f"}, int64(len("abcd")), true, "", nil},
+		{bucket, object, []byte("efgh"), map[string]string{"etag": "1f7690ebdd9b4caf8fab49ca1757bf27"}, int64(len("efgh")), true, "", nil},
+		{bucket, object, []byte("ijkl"), map[string]string{"etag": "09a0877d04abf8759f99adec02baf579"}, int64(len("ijkl")), true, "", nil},
+		{bucket, object, []byte("mnop"), map[string]string{"etag": "e132e96a5ddad6da8b07bba6f6131fef"}, int64(len("mnop")), true, "", nil},
 	}
 
 	sha256sum := ""
@@ -246,8 +246,8 @@ func testObjectAPIPutObjectDiskNotFound(obj ObjectLayer, instanceType string, di
 		// Test passes as expected, but the output values are verified for correctness here.
 		if actualErr == nil && testCase.shouldPass {
 			// Asserting whether the md5 output is correct.
-			if testCase.inputMeta["md5Sum"] != objInfo.MD5Sum {
-				t.Errorf("Test %d: %s: Calculated Md5 different from the actual one %s.", i+1, instanceType, objInfo.MD5Sum)
+			if testCase.inputMeta["etag"] != objInfo.ETag {
+				t.Errorf("Test %d: %s: Calculated Md5 different from the actual one %s.", i+1, instanceType, objInfo.ETag)
 			}
 		}
 	}
@@ -271,7 +271,7 @@ func testObjectAPIPutObjectDiskNotFound(obj ObjectLayer, instanceType string, di
 		bucket,
 		object,
 		[]byte("mnop"),
-		map[string]string{"md5Sum": "e132e96a5ddad6da8b07bba6f6131fef"},
+		map[string]string{"etag": "e132e96a5ddad6da8b07bba6f6131fef"},
 		int64(len("mnop")),
 		false,
 		"",
@@ -303,7 +303,7 @@ func testObjectAPIPutObjectStaleFiles(obj ObjectLayer, instanceType string, disk
 	object := "minio-object"
 
 	// Create bucket.
-	err := obj.MakeBucket(bucket)
+	err := obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -338,7 +338,7 @@ func testObjectAPIMultipartPutObjectStaleFiles(obj ObjectLayer, instanceType str
 	object := "minio-object"
 
 	// Create bucket.
-	err := obj.MakeBucket(bucket)
+	err := obj.MakeBucketWithLocation(bucket, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())

cmd/object-api-utils.go

@@ -119,10 +119,7 @@ func IsValidObjectName(object string) bool {
 	if len(object) == 0 {
 		return false
 	}
-	if hasSuffix(object, slashSeparator) {
-		return false
-	}
-	if hasPrefix(object, slashSeparator) {
+	if hasSuffix(object, slashSeparator) || hasPrefix(object, slashSeparator) {
 		return false
 	}
 	return IsValidObjectPrefix(object)
@@ -190,6 +187,35 @@ func getCompleteMultipartMD5(parts []completePart) (string, error) {
 	return s3MD5, nil
 }
 
+// Clean meta etag keys 'md5Sum', 'etag'.
+func cleanMetaETag(metadata map[string]string) map[string]string {
+	return cleanMetadata(metadata, "md5Sum", "etag")
+}
+
+// Clean metadata takes keys to be filtered
+// and returns a new map with the keys filtered.
+func cleanMetadata(metadata map[string]string, keyNames ...string) map[string]string {
+	var newMeta = make(map[string]string)
+	for k, v := range metadata {
+		if contains(keyNames, k) {
+			continue
+		}
+		newMeta[k] = v
+	}
+	return newMeta
+}
+
+// Extracts etag value from the metadata.
+func extractETag(metadata map[string]string) string {
+	// md5Sum tag is kept for backward compatibility.
+	etag, ok := metadata["md5Sum"]
+	if !ok {
+		etag = metadata["etag"]
+	}
+	// Success.
+	return etag
+}
+
 // Prefix matcher string matches prefix in a platform specific way.
 // For example on windows since its case insensitive we are supposed
 // to do case insensitive checks.

cmd/object-handlers-common.go

@@ -59,8 +59,8 @@ func checkCopyObjectPreconditions(w http.ResponseWriter, r *http.Request, objInf
 		// set object-related metadata headers
 		w.Header().Set("Last-Modified", objInfo.ModTime.UTC().Format(http.TimeFormat))
 
-		if objInfo.MD5Sum != "" {
-			w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
+		if objInfo.ETag != "" {
+			w.Header().Set("ETag", "\""+objInfo.ETag+"\"")
 		}
 	}
 	// x-amz-copy-source-if-modified-since: Return the object only if it has been modified
@@ -95,7 +95,7 @@ func checkCopyObjectPreconditions(w http.ResponseWriter, r *http.Request, objInf
 	// same as the one specified; otherwise return a 412 (precondition failed).
 	ifMatchETagHeader := r.Header.Get("x-amz-copy-source-if-match")
 	if ifMatchETagHeader != "" {
-		if objInfo.MD5Sum != "" && !isETagEqual(objInfo.MD5Sum, ifMatchETagHeader) {
+		if objInfo.ETag != "" && !isETagEqual(objInfo.ETag, ifMatchETagHeader) {
 			// If the object ETag does not match with the specified ETag.
 			writeHeaders()
 			writeErrorResponse(w, ErrPreconditionFailed, r.URL)
@@ -107,7 +107,7 @@ func checkCopyObjectPreconditions(w http.ResponseWriter, r *http.Request, objInf
 	// one specified otherwise, return a 304 (not modified).
 	ifNoneMatchETagHeader := r.Header.Get("x-amz-copy-source-if-none-match")
 	if ifNoneMatchETagHeader != "" {
-		if objInfo.MD5Sum != "" && isETagEqual(objInfo.MD5Sum, ifNoneMatchETagHeader) {
+		if objInfo.ETag != "" && isETagEqual(objInfo.ETag, ifNoneMatchETagHeader) {
 			// If the object ETag matches with the specified ETag.
 			writeHeaders()
 			writeErrorResponse(w, ErrPreconditionFailed, r.URL)
@@ -144,8 +144,8 @@ func checkPreconditions(w http.ResponseWriter, r *http.Request, objInfo ObjectIn
 		// set object-related metadata headers
 		w.Header().Set("Last-Modified", objInfo.ModTime.UTC().Format(http.TimeFormat))
 
-		if objInfo.MD5Sum != "" {
-			w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
+		if objInfo.ETag != "" {
+			w.Header().Set("ETag", "\""+objInfo.ETag+"\"")
 		}
 	}
 	// If-Modified-Since : Return the object only if it has been modified since the specified time,
@@ -180,7 +180,7 @@ func checkPreconditions(w http.ResponseWriter, r *http.Request, objInfo ObjectIn
 	// otherwise return a 412 (precondition failed).
 	ifMatchETagHeader := r.Header.Get("If-Match")
 	if ifMatchETagHeader != "" {
-		if !isETagEqual(objInfo.MD5Sum, ifMatchETagHeader) {
+		if !isETagEqual(objInfo.ETag, ifMatchETagHeader) {
 			// If the object ETag does not match with the specified ETag.
 			writeHeaders()
 			writeErrorResponse(w, ErrPreconditionFailed, r.URL)
@@ -192,7 +192,7 @@ func checkPreconditions(w http.ResponseWriter, r *http.Request, objInfo ObjectIn
 	// one specified otherwise, return a 304 (not modified).
 	ifNoneMatchETagHeader := r.Header.Get("If-None-Match")
 	if ifNoneMatchETagHeader != "" {
-		if isETagEqual(objInfo.MD5Sum, ifNoneMatchETagHeader) {
+		if isETagEqual(objInfo.ETag, ifNoneMatchETagHeader) {
 			// If the object ETag matches with the specified ETag.
 			writeHeaders()
 			w.WriteHeader(http.StatusNotModified)

cmd/object-handlers.go

@@ -360,10 +360,8 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
 
 	defaultMeta := objInfo.UserDefined
 
-	// Make sure to remove saved md5sum, object might have been uploaded
-	// as multipart which doesn't have a standard md5sum, we just let
-	// CopyObject calculate a new one.
-	delete(defaultMeta, "md5Sum")
+	// Make sure to remove saved etag, CopyObject calculates a new one.
+	delete(defaultMeta, "etag")
 
 	newMetadata := getCpObjMetadataFromHeader(r.Header, defaultMeta)
 	// Check if x-amz-metadata-directive was not set to REPLACE and source,
@@ -383,8 +381,7 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
 		return
 	}
 
-	md5Sum := objInfo.MD5Sum
-	response := generateCopyObjectResponse(md5Sum, objInfo.ModTime)
+	response := generateCopyObjectResponse(objInfo.ETag, objInfo.ModTime)
 	encodedSuccessResponse := encodeResponse(response)
 
 	// Write success response.
@@ -482,7 +479,7 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 	}
 
 	// Make sure we hex encode md5sum here.
-	metadata["md5Sum"] = hex.EncodeToString(md5Bytes)
+	metadata["etag"] = hex.EncodeToString(md5Bytes)
 
 	sha256sum := ""
 
@@ -510,7 +507,7 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 		// Initialize stream signature verifier.
 		reader, s3Error := newSignV4ChunkedReader(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
@@ -518,14 +515,14 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 	case authTypeSignedV2, authTypePresignedV2:
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
 		objInfo, err = objectAPI.PutObject(bucket, object, size, r.Body, metadata, sha256sum)
 	case authTypePresigned, authTypeSigned:
 		if s3Error := reqSignatureV4Verify(r, serverConfig.GetRegion()); s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
@@ -540,7 +537,7 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
 		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
 		return
 	}
-	w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
+	w.Header().Set("ETag", "\""+objInfo.ETag+"\"")
 	writeSuccessResponseHeadersOnly(w)
 
 	// Get host and port from Request.RemoteAddr.
@@ -791,7 +788,7 @@ func (api objectAPIHandlers) PutObjectPartHandler(w http.ResponseWriter, r *http
 		// Initialize stream signature verifier.
 		reader, s3Error := newSignV4ChunkedReader(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
@@ -799,14 +796,14 @@ func (api objectAPIHandlers) PutObjectPartHandler(w http.ResponseWriter, r *http
 	case authTypeSignedV2, authTypePresignedV2:
 		s3Error := isReqAuthenticatedV2(r)
 		if s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
 		partInfo, err = objectAPI.PutObjectPart(bucket, object, uploadID, partID, size, r.Body, incomingMD5, sha256sum)
 	case authTypePresigned, authTypeSigned:
 		if s3Error := reqSignatureV4Verify(r, serverConfig.GetRegion()); s3Error != ErrNone {
-			errorIf(errSignatureMismatch, dumpRequest(r))
+			errorIf(errSignatureMismatch, "%s", dumpRequest(r))
 			writeErrorResponse(w, s3Error, r.URL)
 			return
 		}
@@ -965,7 +962,7 @@ func (api objectAPIHandlers) CompleteMultipartUploadHandler(w http.ResponseWrite
 	// Get object location.
 	location := getLocation(r)
 	// Generate complete multipart response.
-	response := generateCompleteMultpartUploadResponse(bucket, object, location, objInfo.MD5Sum)
+	response := generateCompleteMultpartUploadResponse(bucket, object, location, objInfo.ETag)
 	encodedSuccessResponse := encodeResponse(response)
 	if err != nil {
 		errorIf(err, "Unable to parse CompleteMultipartUpload response")
@@ -974,7 +971,7 @@ func (api objectAPIHandlers) CompleteMultipartUploadHandler(w http.ResponseWrite
 	}
 
 	// Set etag.
-	w.Header().Set("ETag", "\""+objInfo.MD5Sum+"\"")
+	w.Header().Set("ETag", "\""+objInfo.ETag+"\"")
 
 	// Write success response.
 	writeSuccessResponseXML(w, encodedSuccessResponse)

cmd/object-handlers_test.go

@@ -2126,8 +2126,8 @@ func testAPICompleteMultipartHandler(obj ObjectLayer, instanceType, bucketName s
 		uploadIDs = append(uploadIDs, uploadID)
 	}
 
-	// Parts with size greater than 5 MB.
-	// Generating a 6MB byte array.
+	// Parts with size greater than 5 MiB.
+	// Generating a 6 MiB byte array.
 	validPart := bytes.Repeat([]byte("abcdef"), 1*humanize.MiByte)
 	validPartMD5 := getMD5Hash(validPart)
 	// Create multipart parts.
@@ -2147,11 +2147,11 @@ func testAPICompleteMultipartHandler(obj ObjectLayer, instanceType, bucketName s
 		{bucketName, objectName, uploadIDs[0], 2, "efgh", "1f7690ebdd9b4caf8fab49ca1757bf27", int64(len("efgh"))},
 		{bucketName, objectName, uploadIDs[0], 3, "ijkl", "09a0877d04abf8759f99adec02baf579", int64(len("abcd"))},
 		{bucketName, objectName, uploadIDs[0], 4, "mnop", "e132e96a5ddad6da8b07bba6f6131fef", int64(len("abcd"))},
-		// Part with size larger than 5Mb.
+		// Part with size larger than 5 MiB.
 		{bucketName, objectName, uploadIDs[0], 5, string(validPart), validPartMD5, int64(len(string(validPart)))},
 		{bucketName, objectName, uploadIDs[0], 6, string(validPart), validPartMD5, int64(len(string(validPart)))},
 
-		// Part with size larger than 5Mb.
+		// Part with size larger than 5 MiB.
 		// Parts uploaded for anonymous/unsigned API handler test.
 		{bucketName, objectName, uploadIDs[1], 1, string(validPart), validPartMD5, int64(len(string(validPart)))},
 		{bucketName, objectName, uploadIDs[1], 2, string(validPart), validPartMD5, int64(len(string(validPart)))},
@@ -2192,7 +2192,7 @@ func testAPICompleteMultipartHandler(obj ObjectLayer, instanceType, bucketName s
 		},
 		// inputParts - 3.
 		// Case with valid parts,but parts are unsorted.
-		// Part size greater than 5MB.
+		// Part size greater than 5 MiB.
 		{
 			[]completePart{
 				{ETag: validPartMD5, PartNumber: 6},
@@ -2201,7 +2201,7 @@ func testAPICompleteMultipartHandler(obj ObjectLayer, instanceType, bucketName s
 		},
 		// inputParts - 4.
 		// Case with valid part.
-		// Part size greater than 5MB.
+		// Part size greater than 5 MiB.
 		{
 			[]completePart{
 				{ETag: validPartMD5, PartNumber: 5},
@@ -2211,7 +2211,7 @@ func testAPICompleteMultipartHandler(obj ObjectLayer, instanceType, bucketName s
 
 		// inputParts - 5.
 		// Used for the case of testing for anonymous API request.
-		// Part size greater than 5MB.
+		// Part size greater than 5 MiB.
 		{
 			[]completePart{
 				{ETag: validPartMD5, PartNumber: 1},
@@ -2481,8 +2481,8 @@ func testAPIAbortMultipartHandler(obj ObjectLayer, instanceType, bucketName stri
 		uploadIDs = append(uploadIDs, uploadID)
 	}
 
-	// Parts with size greater than 5 MB.
-	// Generating a 6MB byte array.
+	// Parts with size greater than 5 MiB.
+	// Generating a 6 MiB byte array.
 	validPart := bytes.Repeat([]byte("abcdef"), 1*humanize.MiByte)
 	validPartMD5 := getMD5Hash(validPart)
 	// Create multipart parts.
@@ -2502,11 +2502,11 @@ func testAPIAbortMultipartHandler(obj ObjectLayer, instanceType, bucketName stri
 		{bucketName, objectName, uploadIDs[0], 2, "efgh", "1f7690ebdd9b4caf8fab49ca1757bf27", int64(len("efgh"))},
 		{bucketName, objectName, uploadIDs[0], 3, "ijkl", "09a0877d04abf8759f99adec02baf579", int64(len("abcd"))},
 		{bucketName, objectName, uploadIDs[0], 4, "mnop", "e132e96a5ddad6da8b07bba6f6131fef", int64(len("abcd"))},
-		// Part with size larger than 5Mb.
+		// Part with size larger than 5 MiB.
 		{bucketName, objectName, uploadIDs[0], 5, string(validPart), validPartMD5, int64(len(string(validPart)))},
 		{bucketName, objectName, uploadIDs[0], 6, string(validPart), validPartMD5, int64(len(string(validPart)))},
 
-		// Part with size larger than 5Mb.
+		// Part with size larger than 5 MiB.
 		// Parts uploaded for anonymous/unsigned API handler test.
 		{bucketName, objectName, uploadIDs[1], 1, string(validPart), validPartMD5, int64(len(string(validPart)))},
 		{bucketName, objectName, uploadIDs[1], 2, string(validPart), validPartMD5, int64(len(string(validPart)))},

cmd/object_api_suite_test.go

@@ -79,7 +79,7 @@ func (s *ObjectLayerAPISuite) TestMakeBucket(c *C) {
 
 // Tests validate bucket creation.
 func testMakeBucket(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("bucket-unknown")
+	err := obj.MakeBucketWithLocation("bucket-unknown", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -92,7 +92,7 @@ func (s *ObjectLayerAPISuite) TestMultipartObjectCreation(c *C) {
 
 // Tests validate creation of part files during Multipart operation.
 func testMultipartObjectCreation(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -104,14 +104,14 @@ func testMultipartObjectCreation(obj ObjectLayer, instanceType string, c TestErr
 	data := bytes.Repeat([]byte("0123456789abcdef"), 5*humanize.MiByte/16)
 	completedParts := completeMultipartUpload{}
 	for i := 1; i <= 10; i++ {
-		expectedMD5Sumhex := getMD5Hash(data)
+		expectedETaghex := getMD5Hash(data)
 
 		var calcPartInfo PartInfo
-		calcPartInfo, err = obj.PutObjectPart("bucket", "key", uploadID, i, int64(len(data)), bytes.NewBuffer(data), expectedMD5Sumhex, "")
+		calcPartInfo, err = obj.PutObjectPart("bucket", "key", uploadID, i, int64(len(data)), bytes.NewBuffer(data), expectedETaghex, "")
 		if err != nil {
 			c.Errorf("%s: <ERROR> %s", instanceType, err)
 		}
-		if calcPartInfo.ETag != expectedMD5Sumhex {
+		if calcPartInfo.ETag != expectedETaghex {
 			c.Errorf("MD5 Mismatch")
 		}
 		completedParts.Parts = append(completedParts.Parts, completePart{
@@ -123,7 +123,7 @@ func testMultipartObjectCreation(obj ObjectLayer, instanceType string, c TestErr
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
-	if objInfo.MD5Sum != "7d364cb728ce42a74a96d22949beefb2-10" {
+	if objInfo.ETag != "7d364cb728ce42a74a96d22949beefb2-10" {
 		c.Errorf("Md5 mismtch")
 	}
 }
@@ -135,7 +135,7 @@ func (s *ObjectLayerAPISuite) TestMultipartObjectAbort(c *C) {
 
 // Tests validate abortion of Multipart operation.
 func testMultipartObjectAbort(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -153,18 +153,18 @@ func testMultipartObjectAbort(obj ObjectLayer, instanceType string, c TestErrHan
 			randomString = randomString + strconv.Itoa(num)
 		}
 
-		expectedMD5Sumhex := getMD5Hash([]byte(randomString))
+		expectedETaghex := getMD5Hash([]byte(randomString))
 
-		metadata["md5"] = expectedMD5Sumhex
+		metadata["md5"] = expectedETaghex
 		var calcPartInfo PartInfo
-		calcPartInfo, err = obj.PutObjectPart("bucket", "key", uploadID, i, int64(len(randomString)), bytes.NewBufferString(randomString), expectedMD5Sumhex, "")
+		calcPartInfo, err = obj.PutObjectPart("bucket", "key", uploadID, i, int64(len(randomString)), bytes.NewBufferString(randomString), expectedETaghex, "")
 		if err != nil {
 			c.Fatalf("%s: <ERROR> %s", instanceType, err)
 		}
-		if calcPartInfo.ETag != expectedMD5Sumhex {
+		if calcPartInfo.ETag != expectedETaghex {
 			c.Errorf("Md5 Mismatch")
 		}
-		parts[i] = expectedMD5Sumhex
+		parts[i] = expectedETaghex
 	}
 	err = obj.AbortMultipartUpload("bucket", "key", uploadID)
 	if err != nil {
@@ -180,7 +180,7 @@ func (s *ObjectLayerAPISuite) TestMultipleObjectCreation(c *C) {
 // Tests validate object creation.
 func testMultipleObjectCreation(obj ObjectLayer, instanceType string, c TestErrHandler) {
 	objects := make(map[string][]byte)
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -191,18 +191,18 @@ func testMultipleObjectCreation(obj ObjectLayer, instanceType string, c TestErrH
 			randomString = randomString + strconv.Itoa(num)
 		}
 
-		expectedMD5Sumhex := getMD5Hash([]byte(randomString))
+		expectedETaghex := getMD5Hash([]byte(randomString))
 
 		key := "obj" + strconv.Itoa(i)
 		objects[key] = []byte(randomString)
 		metadata := make(map[string]string)
-		metadata["md5Sum"] = expectedMD5Sumhex
+		metadata["etag"] = expectedETaghex
 		var objInfo ObjectInfo
 		objInfo, err = obj.PutObject("bucket", key, int64(len(randomString)), bytes.NewBufferString(randomString), metadata, "")
 		if err != nil {
 			c.Fatalf("%s: <ERROR> %s", instanceType, err)
 		}
-		if objInfo.MD5Sum != expectedMD5Sumhex {
+		if objInfo.ETag != expectedETaghex {
 			c.Errorf("Md5 Mismatch")
 		}
 	}
@@ -235,7 +235,7 @@ func (s *ObjectLayerAPISuite) TestPaging(c *C) {
 
 // Tests validate creation of objects and the order of listing using various filters for ListObjects operation.
 func testPaging(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	obj.MakeBucket("bucket")
+	obj.MakeBucketWithLocation("bucket", "")
 	result, err := obj.ListObjects("bucket", "", "", "", 0)
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
@@ -438,7 +438,7 @@ func (s *ObjectLayerAPISuite) TestObjectOverwriteWorks(c *C) {
 
 // Tests validate overwriting of an existing object.
 func testObjectOverwriteWorks(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -488,11 +488,11 @@ func (s *ObjectLayerAPISuite) TestBucketRecreateFails(c *C) {
 
 // Tests validate that recreation of the bucket fails.
 func testBucketRecreateFails(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("string")
+	err := obj.MakeBucketWithLocation("string", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
-	err = obj.MakeBucket("string")
+	err = obj.MakeBucketWithLocation("string", "")
 	if err == nil {
 		c.Fatalf("%s: Expected error but found nil.", instanceType)
 	}
@@ -513,7 +513,7 @@ func testPutObject(obj ObjectLayer, instanceType string, c TestErrHandler) {
 	length := int64(len(content))
 	readerEOF := newTestReaderEOF(content)
 	readerNoEOF := newTestReaderNoEOF(content)
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -552,7 +552,7 @@ func (s *ObjectLayerAPISuite) TestPutObjectInSubdir(c *C) {
 
 // Tests validate PutObject with subdirectory prefix.
 func testPutObjectInSubdir(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -593,7 +593,7 @@ func testListBuckets(obj ObjectLayer, instanceType string, c TestErrHandler) {
 	}
 
 	// add one and test exists.
-	err = obj.MakeBucket("bucket1")
+	err = obj.MakeBucketWithLocation("bucket1", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -607,7 +607,7 @@ func testListBuckets(obj ObjectLayer, instanceType string, c TestErrHandler) {
 	}
 
 	// add two and test exists.
-	err = obj.MakeBucket("bucket2")
+	err = obj.MakeBucketWithLocation("bucket2", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -621,7 +621,7 @@ func testListBuckets(obj ObjectLayer, instanceType string, c TestErrHandler) {
 	}
 
 	// add three and test exists + prefix.
-	err = obj.MakeBucket("bucket22")
+	err = obj.MakeBucketWithLocation("bucket22", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -645,11 +645,11 @@ func testListBucketsOrder(obj ObjectLayer, instanceType string, c TestErrHandler
 	// if implementation contains a map, order of map keys will vary.
 	// this ensures they return in the same order each time.
 	// add one and test exists.
-	err := obj.MakeBucket("bucket1")
+	err := obj.MakeBucketWithLocation("bucket1", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
-	err = obj.MakeBucket("bucket2")
+	err = obj.MakeBucketWithLocation("bucket2", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -698,7 +698,7 @@ func (s *ObjectLayerAPISuite) TestNonExistantObjectInBucket(c *C) {
 
 // Tests validate that GetObject fails on a non-existent bucket as expected.
 func testNonExistantObjectInBucket(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -736,7 +736,7 @@ func (s *ObjectLayerAPISuite) TestGetDirectoryReturnsObjectNotFound(c *C) {
 // Tests validate that GetObject on an existing directory fails as expected.
 func testGetDirectoryReturnsObjectNotFound(obj ObjectLayer, instanceType string, c TestErrHandler) {
 	bucketName := "bucket"
-	err := obj.MakeBucket(bucketName)
+	err := obj.MakeBucketWithLocation(bucketName, "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
@@ -749,23 +749,26 @@ func testGetDirectoryReturnsObjectNotFound(obj ObjectLayer, instanceType string,
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}
 
-	for i, objName := range []string{"dir1", "dir1/", "dir1/dir3", "dir1/dir3/"} {
-		_, err = obj.GetObjectInfo(bucketName, objName)
-		if isErrObjectNotFound(err) {
-			err = errorCause(err)
-			err1 := err.(ObjectNotFound)
-			if err1.Bucket != bucketName {
-				c.Errorf("Test %d, %s: Expected the bucket name in the error message to be `%s`, but instead found `%s`",
-					i+1, instanceType, bucketName, err1.Bucket)
-			}
-			if err1.Object != objName {
-				c.Errorf("Test %d, %s: Expected the object name in the error message to be `%s`, but instead found `%s`",
-					i+1, instanceType, objName, err1.Object)
-			}
-		} else {
-			if err.Error() != "ObjectNotFound" {
-				c.Errorf("Test %d, %s: Expected the error message to be `%s`, but instead found `%s`", i+1, instanceType,
-					"ObjectNotFound", err.Error())
+	testCases := []struct {
+		dir string
+		err error
+	}{
+		{
+			dir: "dir1/",
+			err: ObjectNotFound{Bucket: bucketName, Object: "dir1/"},
+		},
+		{
+			dir: "dir1/dir3/",
+			err: ObjectNotFound{Bucket: bucketName, Object: "dir1/dir3/"},
+		},
+	}
+
+	for i, testCase := range testCases {
+		_, expectedErr := obj.GetObjectInfo(bucketName, testCase.dir)
+		if expectedErr != nil {
+			expectedErr = errorCause(expectedErr)
+			if expectedErr.Error() != testCase.err.Error() {
+				c.Errorf("Test %d, %s: Expected error %s, got %s", i+1, instanceType, testCase.err, expectedErr)
 			}
 		}
 	}
@@ -778,7 +781,7 @@ func (s *ObjectLayerAPISuite) TestContentType(c *C) {
 
 // Test content-type.
 func testContentType(obj ObjectLayer, instanceType string, c TestErrHandler) {
-	err := obj.MakeBucket("bucket")
+	err := obj.MakeBucketWithLocation("bucket", "")
 	if err != nil {
 		c.Fatalf("%s: <ERROR> %s", instanceType, err)
 	}

cmd/posix.go

@@ -18,6 +18,8 @@ package cmd
 
 import (
 	"bytes"
+	"encoding/hex"
+	"hash"
 	"io"
 	"io/ioutil"
 	"os"
@@ -249,7 +251,7 @@ func (s *posix) MakeVol(volume string) (err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return errFaultyDisk
 	}
 
@@ -283,7 +285,7 @@ func (s *posix) ListVols() (volsInfo []VolInfo, err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return nil, errFaultyDisk
 	}
 
@@ -347,7 +349,7 @@ func (s *posix) StatVol(volume string) (volInfo VolInfo, err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return VolInfo{}, errFaultyDisk
 	}
 
@@ -386,7 +388,7 @@ func (s *posix) DeleteVol(volume string) (err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return errFaultyDisk
 	}
 
@@ -420,7 +422,7 @@ func (s *posix) ListDir(volume, dirPath string) (entries []string, err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return nil, errFaultyDisk
 	}
 
@@ -457,7 +459,7 @@ func (s *posix) ReadAll(volume, path string) (buf []byte, err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return nil, errFaultyDisk
 	}
 
@@ -512,18 +514,37 @@ func (s *posix) ReadAll(volume, path string) (buf []byte, err error) {
 // number of bytes copied. The error is EOF only if no bytes were
 // read. On return, n == len(buf) if and only if err == nil. n == 0
 // for io.EOF.
+//
 // If an EOF happens after reading some but not all the bytes,
 // ReadFull returns ErrUnexpectedEOF.
-// Additionally ReadFile also starts reading from an offset.
-// ReadFile symantics are same as io.ReadFull
-func (s *posix) ReadFile(volume string, path string, offset int64, buf []byte) (n int64, err error) {
+//
+// Additionally ReadFile also starts reading from an offset. ReadFile
+// semantics are same as io.ReadFull.
+func (s *posix) ReadFile(volume, path string, offset int64, buf []byte) (n int64, err error) {
+
+	return s.ReadFileWithVerify(volume, path, offset, buf, "", "")
+}
+
+// ReadFileWithVerify is the same as ReadFile but with hashsum
+// verification: the operation will fail if the hash verification
+// fails.
+//
+// The `expectedHash` is the expected hex-encoded hash string for
+// verification. With an empty expected hash string, hash verification
+// is skipped. An empty HashAlgo defaults to `blake2b`.
+//
+// The function takes care to minimize the number of disk read
+// operations.
+func (s *posix) ReadFileWithVerify(volume, path string, offset int64, buf []byte,
+	algo HashAlgo, expectedHash string) (n int64, err error) {
+
 	defer func() {
 		if err == syscall.EIO {
 			atomic.AddInt32(&s.ioErrCount, 1)
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return 0, errFaultyDisk
 	}
 
@@ -571,19 +592,66 @@ func (s *posix) ReadFile(volume string, path string, offset int64, buf []byte) (
 		return 0, err
 	}
 
-	// Verify if its not a regular file, since subsequent Seek is undefined.
+	// Verify it is a regular file, otherwise subsequent Seek is
+	// undefined.
 	if !st.Mode().IsRegular() {
 		return 0, errIsNotRegular
 	}
 
-	// Seek to requested offset.
-	_, err = file.Seek(offset, os.SEEK_SET)
-	if err != nil {
+	// If expected hash string is empty hash verification is
+	// skipped.
+	needToHash := expectedHash != ""
+	var hasher hash.Hash
+
+	if needToHash {
+		// If the hashing algo is invalid, return an error.
+		if !isValidHashAlgo(algo) {
+			return 0, errBitrotHashAlgoInvalid
+		}
+
+		// Compute hash of object from start to the byte at
+		// (offset - 1), and as a result of this read, seek to
+		// `offset`.
+		hasher = newHash(algo)
+		if offset > 0 {
+			_, err = io.CopyN(hasher, file, offset)
+			if err != nil {
+				return 0, err
+			}
+		}
+	} else {
+		// Seek to requested offset.
+		_, err = file.Seek(offset, os.SEEK_SET)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	// Read until buffer is full.
+	m, err := io.ReadFull(file, buf)
+	if err == io.EOF {
 		return 0, err
 	}
 
-	// Read full until buffer.
-	m, err := io.ReadFull(file, buf)
+	if needToHash {
+		// Continue computing hash with buf.
+		_, err = hasher.Write(buf)
+		if err != nil {
+			return 0, err
+		}
+
+		// Continue computing hash until end of file.
+		_, err = io.Copy(hasher, file)
+		if err != nil {
+			return 0, err
+		}
+
+		// Verify the computed hash.
+		computedHash := hex.EncodeToString(hasher.Sum(nil))
+		if computedHash != expectedHash {
+			return 0, hashMismatchError{expectedHash, computedHash}
+		}
+	}
 
 	// Success.
 	return int64(m), err
@@ -596,7 +664,7 @@ func (s *posix) createFile(volume, path string) (f *os.File, err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return nil, errFaultyDisk
 	}
 
@@ -669,7 +737,7 @@ func (s *posix) PrepareFile(volume, path string, fileSize int64) (err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return errFaultyDisk
 	}
 
@@ -716,7 +784,7 @@ func (s *posix) AppendFile(volume, path string, buf []byte) (err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return errFaultyDisk
 	}
 
@@ -747,7 +815,7 @@ func (s *posix) StatFile(volume, path string) (file FileInfo, err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return FileInfo{}, errFaultyDisk
 	}
 
@@ -843,7 +911,7 @@ func (s *posix) DeleteFile(volume, path string) (err error) {
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return errFaultyDisk
 	}
 
@@ -883,7 +951,7 @@ func (s *posix) RenameFile(srcVolume, srcPath, dstVolume, dstPath string) (err e
 		}
 	}()
 
-	if s.ioErrCount > maxAllowedIOError {
+	if atomic.LoadInt32(&s.ioErrCount) > maxAllowedIOError {
 		return errFaultyDisk
 	}
 

cmd/posix_test.go

@@ -18,6 +18,8 @@ package cmd
 
 import (
 	"bytes"
+	"crypto/sha256"
+	"encoding/hex"
 	"io"
 	"io/ioutil"
 	"os"
@@ -26,6 +28,8 @@ import (
 	"strings"
 	"syscall"
 	"testing"
+
+	"golang.org/x/crypto/blake2b"
 )
 
 // creates a temp dir and sets up posix layer.
@@ -1017,6 +1021,115 @@ func TestPosixReadFile(t *testing.T) {
 	}
 }
 
+// TestPosixReadFileWithVerify - tests the posix level
+// ReadFileWithVerify API. Only tests hashing related
+// functionality. Other functionality is tested with
+// TestPosixReadFile.
+func TestPosixReadFileWithVerify(t *testing.T) {
+	// create posix test setup
+	posixStorage, path, err := newPosixTestSetup()
+	if err != nil {
+		t.Fatalf("Unable to create posix test setup, %s", err)
+	}
+	defer removeAll(path)
+
+	volume := "success-vol"
+	// Setup test environment.
+	if err = posixStorage.MakeVol(volume); err != nil {
+		t.Fatalf("Unable to create volume, %s", err)
+	}
+
+	blakeHash := func(s string) string {
+		k := blake2b.Sum512([]byte(s))
+		return hex.EncodeToString(k[:])
+	}
+
+	sha256Hash := func(s string) string {
+		k := sha256.Sum256([]byte(s))
+		return hex.EncodeToString(k[:])
+	}
+
+	testCases := []struct {
+		fileName     string
+		offset       int64
+		bufSize      int
+		algo         HashAlgo
+		expectedHash string
+
+		expectedBuf []byte
+		expectedErr error
+	}{
+		// Hash verification is skipped with empty expected
+		// hash - 1
+		{
+			"myobject", 0, 5, HashBlake2b, "",
+			[]byte("Hello"), nil,
+		},
+		// Hash verification failure case - 2
+		{
+			"myobject", 0, 5, HashBlake2b, "a",
+			[]byte(""),
+			hashMismatchError{"a", blakeHash("Hello, world!")},
+		},
+		// Hash verification success with full content requested - 3
+		{
+			"myobject", 0, 13, HashBlake2b, blakeHash("Hello, world!"),
+			[]byte("Hello, world!"), nil,
+		},
+		// Hash verification success with full content and Sha256 - 4
+		{
+			"myobject", 0, 13, HashSha256, sha256Hash("Hello, world!"),
+			[]byte("Hello, world!"), nil,
+		},
+		// Hash verification success with partial content requested - 5
+		{
+			"myobject", 7, 4, HashBlake2b, blakeHash("Hello, world!"),
+			[]byte("worl"), nil,
+		},
+		// Hash verification success with partial content and Sha256 - 6
+		{
+			"myobject", 7, 4, HashSha256, sha256Hash("Hello, world!"),
+			[]byte("worl"), nil,
+		},
+		// Empty hash-algo returns error - 7
+		{
+			"myobject", 7, 4, "", blakeHash("Hello, world!"),
+			[]byte("worl"), errBitrotHashAlgoInvalid,
+		},
+		// Empty content hash verification with empty
+		// hash-algo algo returns error - 8
+		{
+			"myobject", 7, 0, "", blakeHash("Hello, world!"),
+			[]byte(""), errBitrotHashAlgoInvalid,
+		},
+	}
+
+	// Create file used in testcases
+	err = posixStorage.AppendFile(volume, "myobject", []byte("Hello, world!"))
+	if err != nil {
+		t.Fatalf("Failure in test setup: %v\n", err)
+	}
+
+	// Validate each test case.
+	for i, testCase := range testCases {
+		var n int64
+		// Common read buffer.
+		var buf = make([]byte, testCase.bufSize)
+		n, err = posixStorage.ReadFileWithVerify(volume, testCase.fileName, testCase.offset, buf, testCase.algo, testCase.expectedHash)
+
+		switch {
+		case err == nil && testCase.expectedErr != nil:
+			t.Errorf("Test %d: Expected error %v but got none.", i+1, testCase.expectedErr)
+		case err == nil && n != int64(testCase.bufSize):
+			t.Errorf("Test %d: %d bytes were expected, but %d were written", i+1, testCase.bufSize, n)
+		case err == nil && !bytes.Equal(testCase.expectedBuf, buf):
+			t.Errorf("Test %d: Expected bytes: %v, but got: %v", i+1, testCase.expectedBuf, buf)
+		case err != nil && err != testCase.expectedErr:
+			t.Errorf("Test %d: Expected error: %v, but got: %v", i+1, testCase.expectedErr, err)
+		}
+	}
+}
+
 // TestPosix posix.AppendFile()
 func TestPosixAppendFile(t *testing.T) {
 	// create posix test setup

cmd/post-policy_test.go

@@ -143,7 +143,7 @@ func testPostPolicyBucketHandler(obj ObjectLayer, instanceType string, t TestErr
 	// objectNames[0].
 	// uploadIds [0].
 	// Create bucket before initiating NewMultipartUpload.
-	err = obj.MakeBucket(bucketName)
+	err = obj.MakeBucketWithLocation(bucketName, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -246,6 +246,7 @@ func testPostPolicyBucketHandler(obj ObjectLayer, instanceType string, t TestErr
 		}
 	}
 
+	region := "us-east-1"
 	// Test cases for signature-V4.
 	testCasesV4BadData := []struct {
 		objectName         string
@@ -330,7 +331,7 @@ func testPostPolicyBucketHandler(obj ObjectLayer, instanceType string, t TestErr
 		testCase.policy = fmt.Sprintf(testCase.policy, testCase.dates...)
 
 		req, perr := newPostRequestV4Generic("", bucketName, testCase.objectName, testCase.data, testCase.accessKey,
-			testCase.secretKey, curTime, []byte(testCase.policy), nil, testCase.corruptedBase64, testCase.corruptedMultipart)
+			testCase.secretKey, region, curTime, []byte(testCase.policy), nil, testCase.corruptedBase64, testCase.corruptedMultipart)
 		if perr != nil {
 			t.Fatalf("Test %d: %s: Failed to create HTTP request for PostPolicyHandler: <ERROR> %v", i+1, instanceType, perr)
 		}
@@ -458,7 +459,7 @@ func testPostPolicyBucketHandlerRedirect(obj ObjectLayer, instanceType string, t
 	curTime := UTCNow()
 	curTimePlus5Min := curTime.Add(time.Minute * 5)
 
-	err = obj.MakeBucket(bucketName)
+	err = obj.MakeBucketWithLocation(bucketName, "")
 	if err != nil {
 		// Failed to create newbucket, abort.
 		t.Fatalf("%s : %s", instanceType, err.Error())
@@ -473,9 +474,10 @@ func testPostPolicyBucketHandlerRedirect(obj ObjectLayer, instanceType string, t
 	// Generate the final policy document
 	policy = fmt.Sprintf(policy, dates...)
 
+	region := "us-east-1"
 	// Create a new POST request with success_action_redirect field specified
 	req, perr := newPostRequestV4Generic("", bucketName, keyName, []byte("objData"),
-		credentials.AccessKey, credentials.SecretKey, curTime,
+		credentials.AccessKey, credentials.SecretKey, region, curTime,
 		[]byte(policy), map[string]string{"success_action_redirect": redirectURL.String()}, false, false)
 
 	if perr != nil {
@@ -565,11 +567,11 @@ func newPostRequestV2(endPoint, bucketName, objectName string, accessKey, secret
 	return req, nil
 }
 
-func buildGenericPolicy(t time.Time, accessKey, bucketName, objectName string, contentLengthRange bool) []byte {
+func buildGenericPolicy(t time.Time, accessKey, region, bucketName, objectName string, contentLengthRange bool) []byte {
 	// Expire the request five minutes from now.
 	expirationTime := t.Add(time.Minute * 5)
 
-	credStr := getCredentialString(accessKey, serverConfig.GetRegion(), t)
+	credStr := getCredentialString(accessKey, region, t)
 	// Create a new post policy.
 	policy := newPostPolicyBytesV4(credStr, bucketName, objectName, expirationTime)
 	if contentLengthRange {
@@ -578,10 +580,10 @@ func buildGenericPolicy(t time.Time, accessKey, bucketName, objectName string, c
 	return policy
 }
 
-func newPostRequestV4Generic(endPoint, bucketName, objectName string, objData []byte, accessKey, secretKey string,
+func newPostRequestV4Generic(endPoint, bucketName, objectName string, objData []byte, accessKey, secretKey string, region string,
 	t time.Time, policy []byte, addFormData map[string]string, corruptedB64 bool, corruptedMultipart bool) (*http.Request, error) {
 	// Get the user credential.
-	credStr := getCredentialString(accessKey, serverConfig.GetRegion(), t)
+	credStr := getCredentialString(accessKey, region, t)
 
 	// Only need the encoding.
 	encodedPolicy := base64.StdEncoding.EncodeToString(policy)
@@ -591,7 +593,7 @@ func newPostRequestV4Generic(endPoint, bucketName, objectName string, objData []
 	}
 
 	// Presign with V4 signature based on the policy.
-	signature := postPresignSignatureV4(encodedPolicy, t, secretKey, serverConfig.GetRegion())
+	signature := postPresignSignatureV4(encodedPolicy, t, secretKey, region)
 
 	formData := map[string]string{
 		"bucket":           bucketName,
@@ -645,12 +647,14 @@ func newPostRequestV4Generic(endPoint, bucketName, objectName string, objData []
 
 func newPostRequestV4WithContentLength(endPoint, bucketName, objectName string, objData []byte, accessKey, secretKey string) (*http.Request, error) {
 	t := UTCNow()
-	policy := buildGenericPolicy(t, accessKey, bucketName, objectName, true)
-	return newPostRequestV4Generic(endPoint, bucketName, objectName, objData, accessKey, secretKey, t, policy, nil, false, false)
+	region := "us-east-1"
+	policy := buildGenericPolicy(t, accessKey, region, bucketName, objectName, true)
+	return newPostRequestV4Generic(endPoint, bucketName, objectName, objData, accessKey, secretKey, region, t, policy, nil, false, false)
 }
 
 func newPostRequestV4(endPoint, bucketName, objectName string, objData []byte, accessKey, secretKey string) (*http.Request, error) {
 	t := UTCNow()
-	policy := buildGenericPolicy(t, accessKey, bucketName, objectName, false)
-	return newPostRequestV4Generic(endPoint, bucketName, objectName, objData, accessKey, secretKey, t, policy, nil, false, false)
+	region := "us-east-1"
+	policy := buildGenericPolicy(t, accessKey, region, bucketName, objectName, false)
+	return newPostRequestV4Generic(endPoint, bucketName, objectName, objData, accessKey, secretKey, region, t, policy, nil, false, false)
 }

cmd/retry-storage.go

@@ -178,6 +178,23 @@ func (f retryStorage) ReadFile(volume, path string, offset int64, buffer []byte)
 	return m, err
 }
 
+// ReadFileWithVerify - a retryable implementation of reading at
+// offset from a file with verification.
+func (f retryStorage) ReadFileWithVerify(volume, path string, offset int64, buffer []byte,
+	algo HashAlgo, expectedHash string) (m int64, err error) {
+
+	m, err = f.remoteStorage.ReadFileWithVerify(volume, path, offset, buffer,
+		algo, expectedHash)
+	if err == errDiskNotFound {
+		err = f.reInit()
+		if err == nil {
+			return f.remoteStorage.ReadFileWithVerify(volume, path,
+				offset, buffer, algo, expectedHash)
+		}
+	}
+	return m, err
+}
+
 // ListDir - a retryable implementation of listing directory entries.
 func (f retryStorage) ListDir(volume, path string) (entries []string, err error) {
 	entries, err = f.remoteStorage.ListDir(volume, path)

cmd/retry-storage_test.go

@@ -18,6 +18,8 @@ package cmd
 
 import (
 	"bytes"
+	"crypto/sha256"
+	"encoding/hex"
 	"reflect"
 	"testing"
 	"time"
@@ -290,6 +292,31 @@ func TestRetryStorage(t *testing.T) {
 		if n, err = disk.ReadFile("existent", "path", 7, buf2); err != nil {
 			t.Fatal(err)
 		}
+		if err != nil {
+			t.Error("Error in ReadFile", err)
+		}
+		if n != 5 {
+			t.Fatalf("Expected 5, got %d", n)
+		}
+		if !bytes.Equal(buf2, []byte("World")) {
+			t.Fatalf("Expected `World`, got %s", string(buf2))
+		}
+	}
+
+	sha256Hash := func(s string) string {
+		k := sha256.Sum256([]byte(s))
+		return hex.EncodeToString(k[:])
+	}
+	for _, disk := range storageDisks {
+		var buf2 = make([]byte, 5)
+		var n int64
+		if n, err = disk.ReadFileWithVerify("existent", "path", 7, buf2,
+			HashSha256, sha256Hash("Hello, World")); err != nil {
+			t.Fatal(err)
+		}
+		if err != nil {
+			t.Error("Error in ReadFileWithVerify", err)
+		}
 		if n != 5 {
 			t.Fatalf("Expected 5, got %d", n)
 		}

cmd/server-main.go

@@ -25,6 +25,7 @@ import (
 	"time"
 
 	"github.com/minio/cli"
+	"github.com/minio/dsync"
 )
 
 var serverFlags = []cli.Flag{
@@ -81,8 +82,8 @@ EXAMPLES:
 func checkUpdate(mode string) {
 	// Its OK to ignore any errors during getUpdateInfo() here.
 	if older, downloadURL, err := getUpdateInfo(1*time.Second, mode); err == nil {
-		if older > time.Duration(0) {
-			log.Println(colorizeUpdateMessage(downloadURL, older))
+		if updateMsg := computeUpdateMessage(downloadURL, older); updateMsg != "" {
+			log.Println(updateMsg)
 		}
 	}
 }
@@ -107,7 +108,7 @@ func initConfig() {
 	// Config file does not exist, we create it fresh and return upon success.
 	if isFile(getConfigFile()) {
 		fatalIf(migrateConfig(), "Config migration failed.")
-		fatalIf(loadConfig(), "Unable to load minio config file")
+		fatalIf(loadConfig(), "Unable to load config version: '%s'.", v18)
 	} else {
 		fatalIf(newConfig(), "Unable to initialize minio config for the first time.")
 		log.Println("Created minio configuration file successfully at " + getConfigDir())
@@ -244,7 +245,8 @@ func serverMain(ctx *cli.Context) {
 
 	// Set nodes for dsync for distributed setup.
 	if globalIsDistXL {
-		fatalIf(initDsyncNodes(), "Unable to initialize distributed locking clients")
+		clnts, myNode := newDsyncNodes(globalEndpoints)
+		fatalIf(dsync.Init(clnts, myNode), "Unable to initialize distributed locking clients")
 	}
 
 	// Initialize name space lock.

cmd/server-mux.go

@@ -42,19 +42,22 @@ const (
 	maxHTTPVerbLen = 7
 )
 
+// HTTP2 PRI method.
+var httpMethodPRI = "PRI"
+
 var defaultHTTP2Methods = []string{
-	"PRI",
+	httpMethodPRI,
 }
 
 var defaultHTTP1Methods = []string{
-	"OPTIONS",
-	"GET",
-	"HEAD",
-	"POST",
-	"PUT",
-	"DELETE",
-	"TRACE",
-	"CONNECT",
+	http.MethodOptions,
+	http.MethodGet,
+	http.MethodHead,
+	http.MethodPost,
+	http.MethodPut,
+	http.MethodDelete,
+	http.MethodTrace,
+	http.MethodConnect,
 }
 
 // ConnMux - Peeks into the incoming connection for relevant
@@ -446,17 +449,9 @@ func (m *ServerMux) ListenAndServe(certFile, keyFile string) (err error) {
 	// All http requests start to be processed by httpHandler
 	httpHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if tlsEnabled && r.TLS == nil {
-			// TLS is enabled but Request is not TLS configured
-			u := url.URL{
-				Scheme:   httpsScheme,
-				Opaque:   r.URL.Opaque,
-				User:     r.URL.User,
-				Host:     r.Host,
-				Path:     r.URL.Path,
-				RawQuery: r.URL.RawQuery,
-				Fragment: r.URL.Fragment,
-			}
-			http.Redirect(w, r, u.String(), http.StatusTemporaryRedirect)
+			// TLS is enabled but request is not TLS
+			// configured - return error to client.
+			writeErrorResponse(w, ErrInsecureClientRequest, &url.URL{})
 		} else {
 
 			// Return ServiceUnavailable for clients which are sending requests
@@ -470,7 +465,7 @@ func (m *ServerMux) ListenAndServe(certFile, keyFile string) (err error) {
 			}
 
 			// Execute registered handlers, update currentReqs to keep
-			// tracks of current requests currently processed by the server
+			// track of concurrent requests processing on the server
 			atomic.AddInt32(&m.currentReqs, 1)
 			m.handler.ServeHTTP(w, r)
 			atomic.AddInt32(&m.currentReqs, -1)