Implement S3 Gateway to third party cloud storage providers. (#3756)

Currently supported backend is Azure Blob Storage.

```
export MINIO_ACCESS_KEY=azureaccountname
export MINIO_SECRET_KEY=azureaccountkey
minio gateway azure
```

cmd/api-errors.go

@@ -692,6 +692,8 @@ func toAPIErrorCode(err error) (apiErr APIErrorCode) {
 		apiErr = ErrEntityTooLarge
 	case ObjectTooSmall:
 		apiErr = ErrEntityTooSmall
+	case NotImplemented:
+		apiErr = ErrNotImplemented
 	default:
 		apiErr = ErrInternalError
 	}

cmd/api-errors_test.go

@@ -103,6 +103,10 @@ func TestAPIErrCode(t *testing.T) {
 			StorageFull{},
 			ErrStorageFull,
 		},
+		{
+			NotImplemented{},
+			ErrNotImplemented,
+		},
 		{
 			errSignatureMismatch,
 			ErrSignatureDoesNotMatch,

cmd/azure-anonymous.go

@@ -0,0 +1,185 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strconv"
+	"time"
+
+	"github.com/Azure/azure-sdk-for-go/storage"
+)
+
+// AnonGetBucketInfo - Get bucket metadata from azure anonymously.
+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))
+	}
+	url.RawQuery = "restype=container"
+	resp, err := http.Head(url.String())
+	if err != nil {
+		return bucketInfo, azureToObjectError(traceError(err), bucket)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return bucketInfo, azureToObjectError(traceError(anonErrToObjectErr(resp.StatusCode, bucket)), bucket)
+	}
+
+	t, err := time.Parse(time.RFC1123, resp.Header.Get("Last-Modified"))
+	if err != nil {
+		return bucketInfo, traceError(err)
+	}
+	bucketInfo = BucketInfo{
+		Name:    bucket,
+		Created: t,
+	}
+	return bucketInfo, nil
+}
+
+// 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) {
+	url := a.client.GetBlobURL(bucket, object)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return azureToObjectError(traceError(err), bucket, object)
+	}
+
+	if length > 0 && startOffset > 0 {
+		req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d", startOffset, startOffset+length-1))
+	} else if startOffset > 0 {
+		req.Header.Add("Range", fmt.Sprintf("bytes=%d-", startOffset))
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return azureToObjectError(traceError(err), bucket, object)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusPartialContent && resp.StatusCode != http.StatusOK {
+		return azureToObjectError(traceError(anonErrToObjectErr(resp.StatusCode, bucket, object)), bucket, object)
+	}
+
+	_, err = io.Copy(writer, resp.Body)
+	return traceError(err)
+}
+
+// AnonGetObjectInfo - Send HEAD request without authentication and convert the
+// result to ObjectInfo.
+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()
+
+	if resp.StatusCode != http.StatusOK {
+		return objInfo, azureToObjectError(traceError(anonErrToObjectErr(resp.StatusCode, bucket, object)), bucket, object)
+	}
+
+	var contentLength int64
+	contentLengthStr := resp.Header.Get("Content-Length")
+	if contentLengthStr != "" {
+		contentLength, err = strconv.ParseInt(contentLengthStr, 0, 64)
+		if err != nil {
+			return objInfo, azureToObjectError(traceError(errUnexpected), bucket, object)
+		}
+	}
+
+	t, err := time.Parse(time.RFC1123, resp.Header.Get("Last-Modified"))
+	if err != nil {
+		return objInfo, traceError(err)
+	}
+
+	objInfo.ModTime = t
+	objInfo.Bucket = bucket
+	objInfo.UserDefined = make(map[string]string)
+	if resp.Header.Get("Content-Encoding") != "" {
+		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.ModTime = t
+	objInfo.Name = object
+	objInfo.Size = contentLength
+	return
+}
+
+// AnonListObjects - Use Azure equivalent ListBlobs.
+func (a AzureObjects) AnonListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error) {
+	params := storage.ListBlobsParameters{
+		Prefix:     prefix,
+		Marker:     marker,
+		Delimiter:  delimiter,
+		MaxResults: uint(maxKeys),
+	}
+
+	q := azureListBlobsGetParameters(params)
+	q.Set("restype", "container")
+	q.Set("comp", "list")
+
+	url, err := url.Parse(a.client.GetBlobURL(bucket, ""))
+	if err != nil {
+		return result, azureToObjectError(traceError(err))
+	}
+	url.RawQuery = q.Encode()
+
+	resp, err := http.Get(url.String())
+	if err != nil {
+		return result, azureToObjectError(traceError(err))
+	}
+	defer resp.Body.Close()
+
+	var listResp storage.BlobListResponse
+
+	data, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return result, azureToObjectError(traceError(err))
+	}
+	err = xml.Unmarshal(data, &listResp)
+	if err != nil {
+		return result, azureToObjectError(traceError(err))
+	}
+
+	result.IsTruncated = listResp.NextMarker != ""
+	result.NextMarker = listResp.NextMarker
+	for _, object := range listResp.Blobs {
+		t, e := time.Parse(time.RFC1123, object.Properties.LastModified)
+		if e != nil {
+			continue
+		}
+		result.Objects = append(result.Objects, ObjectInfo{
+			Bucket:          bucket,
+			Name:            object.Name,
+			ModTime:         t,
+			Size:            object.Properties.ContentLength,
+			MD5Sum:          object.Properties.Etag,
+			ContentType:     object.Properties.ContentType,
+			ContentEncoding: object.Properties.ContentEncoding,
+		})
+	}
+	result.Prefixes = listResp.BlobPrefixes
+	return result, nil
+}

cmd/azure-unsupported.go

@@ -0,0 +1,43 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+// HealBucket - Not relevant.
+func (a AzureObjects) HealBucket(bucket string) error {
+	return traceError(NotImplemented{})
+}
+
+// ListBucketsHeal - Not relevant.
+func (a AzureObjects) ListBucketsHeal() (buckets []BucketInfo, err error) {
+	return nil, traceError(NotImplemented{})
+}
+
+// HealObject - Not relevant.
+func (a AzureObjects) HealObject(bucket, object string) error {
+	return traceError(NotImplemented{})
+}
+
+// ListObjectsHeal - Not relevant.
+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,
+	delimiter string, maxUploads int) (ListMultipartsInfo, error) {
+	return ListMultipartsInfo{}, traceError(NotImplemented{})
+}

cmd/azure.go

@@ -0,0 +1,635 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"encoding/base64"
+	"encoding/hex"
+	"fmt"
+	"hash"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/Azure/azure-sdk-for-go/storage"
+	"github.com/minio/minio-go/pkg/policy"
+	"github.com/minio/sha256-simd"
+)
+
+const globalAzureAPIVersion = "2016-05-31"
+
+// To store metadata during NewMultipartUpload which will be used after
+// CompleteMultipartUpload to call SetBlobMetadata.
+type azureMultipartMetaInfo struct {
+	meta map[string]map[string]string
+	*sync.Mutex
+}
+
+// Return metadata map of the multipart object.
+func (a *azureMultipartMetaInfo) get(key string) map[string]string {
+	a.Lock()
+	defer a.Unlock()
+	return a.meta[key]
+}
+
+// Set metadata map for the multipart object.
+func (a *azureMultipartMetaInfo) set(key string, value map[string]string) {
+	a.Lock()
+	defer a.Unlock()
+	a.meta[key] = value
+}
+
+// Delete metadata map for the multipart object.
+func (a *azureMultipartMetaInfo) del(key string) {
+	a.Lock()
+	defer a.Unlock()
+	delete(a.meta, key)
+}
+
+// AzureObjects - Implements Object layer for Azure blob storage.
+type AzureObjects struct {
+	client   storage.BlobStorageClient // Azure sdk client
+	metaInfo azureMultipartMetaInfo
+}
+
+// Convert azure errors to minio object layer errors.
+func azureToObjectError(err error, params ...string) error {
+	if err == nil {
+		return nil
+	}
+
+	e, ok := err.(*Error)
+	if !ok {
+		// Code should be fixed if this function is called without doing traceError()
+		// Else handling different situations in this function makes this function complicated.
+		errorIf(err, "Expected type *Error")
+		return err
+	}
+
+	err = e.e
+	bucket := ""
+	object := ""
+	if len(params) >= 1 {
+		bucket = params[0]
+	}
+	if len(params) == 2 {
+		object = params[1]
+	}
+
+	azureErr, ok := err.(storage.AzureStorageServiceError)
+	if !ok {
+		// We don't interpret non Azure errors. As azure errors will
+		// have StatusCode to help to convert to object errors.
+		return e
+	}
+
+	switch azureErr.Code {
+	case "ContainerAlreadyExists":
+		err = BucketExists{Bucket: bucket}
+	case "InvalidResourceName":
+		err = BucketNameInvalid{Bucket: bucket}
+	default:
+		switch azureErr.StatusCode {
+		case http.StatusNotFound:
+			if object != "" {
+				err = ObjectNotFound{bucket, object}
+			} else {
+				err = BucketNotFound{Bucket: bucket}
+			}
+		case http.StatusBadRequest:
+			err = BucketNameInvalid{Bucket: bucket}
+		}
+	}
+	e.e = err
+	return e
+}
+
+// Inits azure blob storage client and returns AzureObjects.
+func newAzureLayer(account, key string) (GatewayLayer, error) {
+	useHTTPS := true
+	c, err := storage.NewClient(account, key, storage.DefaultBaseURL, globalAzureAPIVersion, useHTTPS)
+	if err != nil {
+		return AzureObjects{}, err
+	}
+	return &AzureObjects{
+		client: c.GetBlobService(),
+		metaInfo: azureMultipartMetaInfo{
+			meta:  make(map[string]map[string]string),
+			Mutex: &sync.Mutex{},
+		},
+	}, nil
+}
+
+// Shutdown - save any gateway metadata to disk
+// if necessary and reload upon next restart.
+func (a AzureObjects) Shutdown() error {
+	// TODO
+	return nil
+}
+
+// StorageInfo - Not relevant to Azure backend.
+func (a AzureObjects) StorageInfo() StorageInfo {
+	return StorageInfo{}
+}
+
+// MakeBucket - Create a new container on azure backend.
+func (a AzureObjects) MakeBucket(bucket 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) {
+	// Azure does not have an equivalent call, hence use ListContainers.
+	resp, err := a.client.ListContainers(storage.ListContainersParameters{
+		Prefix: bucket,
+	})
+	if err != nil {
+		return BucketInfo{}, azureToObjectError(traceError(err), bucket)
+	}
+	for _, container := range resp.Containers {
+		if container.Name == bucket {
+			t, e := time.Parse(time.RFC1123, container.Properties.LastModified)
+			if e == nil {
+				return BucketInfo{
+					Name:    bucket,
+					Created: t,
+				}, nil
+			} // else continue
+		}
+	}
+	return BucketInfo{}, traceError(BucketNotFound{Bucket: bucket})
+}
+
+// ListBuckets - Lists all azure containers, uses Azure equivalent ListContainers.
+func (a AzureObjects) ListBuckets() (buckets []BucketInfo, err error) {
+	resp, err := a.client.ListContainers(storage.ListContainersParameters{})
+	if err != nil {
+		return nil, azureToObjectError(traceError(err))
+	}
+	for _, container := range resp.Containers {
+		t, e := time.Parse(time.RFC1123, container.Properties.LastModified)
+		if e != nil {
+			return nil, traceError(e)
+		}
+		buckets = append(buckets, BucketInfo{
+			Name:    container.Name,
+			Created: t,
+		})
+	}
+	return buckets, nil
+}
+
+// DeleteBucket - delete a container on azure, uses Azure equivalent DeleteContainer.
+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) {
+	resp, err := a.client.ListBlobs(bucket, storage.ListBlobsParameters{
+		Prefix:     prefix,
+		Marker:     marker,
+		Delimiter:  delimiter,
+		MaxResults: uint(maxKeys),
+	})
+	if err != nil {
+		return result, azureToObjectError(traceError(err), bucket, prefix)
+	}
+	result.IsTruncated = resp.NextMarker != ""
+	result.NextMarker = resp.NextMarker
+	for _, object := range resp.Blobs {
+		t, e := time.Parse(time.RFC1123, object.Properties.LastModified)
+		if e != nil {
+			continue
+		}
+		result.Objects = append(result.Objects, ObjectInfo{
+			Bucket:          bucket,
+			Name:            object.Name,
+			ModTime:         t,
+			Size:            object.Properties.ContentLength,
+			MD5Sum:          canonicalizeETag(object.Properties.Etag),
+			ContentType:     object.Properties.ContentType,
+			ContentEncoding: object.Properties.ContentEncoding,
+		})
+	}
+	result.Prefixes = resp.BlobPrefixes
+	return result, nil
+}
+
+// GetObject - reads an object from azure. Supports additional
+// parameters like offset and length which are synonymous with
+// HTTP Range requests.
+//
+// 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 {
+	byteRange := fmt.Sprintf("%d-", startOffset)
+	if length > 0 && startOffset > 0 {
+		byteRange = fmt.Sprintf("%d-%d", startOffset, startOffset+length-1)
+	}
+
+	var rc io.ReadCloser
+	var err error
+	if startOffset == 0 && length == 0 {
+		rc, err = a.client.GetBlob(bucket, object)
+	} else {
+		rc, err = a.client.GetBlobRange(bucket, object, byteRange, nil)
+	}
+	if err != nil {
+		return azureToObjectError(traceError(err), bucket, object)
+	}
+	_, err = io.Copy(writer, rc)
+	rc.Close()
+	return traceError(err)
+}
+
+// GetObjectInfo - reads blob metadata properties and replies back ObjectInfo,
+// uses zure equivalent GetBlobProperties.
+func (a AzureObjects) GetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error) {
+	prop, err := a.client.GetBlobProperties(bucket, object)
+	if err != nil {
+		return objInfo, azureToObjectError(traceError(err), bucket, object)
+	}
+	t, err := time.Parse(time.RFC1123, prop.LastModified)
+	if err != nil {
+		return objInfo, traceError(err)
+	}
+	objInfo = ObjectInfo{
+		Bucket:      bucket,
+		UserDefined: make(map[string]string),
+		MD5Sum:      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
+}
+
+// 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) {
+	var sha256Writer hash.Hash
+	teeReader := data
+	if sha256sum != "" {
+		sha256Writer = sha256.New()
+		teeReader = io.TeeReader(data, sha256Writer)
+	}
+
+	delete(metadata, "md5Sum")
+
+	err = a.client.CreateBlockBlobFromReader(bucket, object, uint64(size), teeReader, canonicalMetadata(metadata))
+	if err != nil {
+		return objInfo, azureToObjectError(traceError(err), bucket, object)
+	}
+
+	if sha256sum != "" {
+		newSHA256sum := hex.EncodeToString(sha256Writer.Sum(nil))
+		if newSHA256sum != sha256sum {
+			a.client.DeleteBlob(bucket, object, nil)
+			return ObjectInfo{}, traceError(SHA256Mismatch{})
+		}
+	}
+
+	return a.GetObjectInfo(bucket, object)
+}
+
+// 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) {
+	err = a.client.CopyBlob(destBucket, destObject, a.client.GetBlobURL(srcBucket, srcObject))
+	if err != nil {
+		return objInfo, azureToObjectError(traceError(err), srcBucket, srcObject)
+	}
+	return a.GetObjectInfo(destBucket, destObject)
+}
+
+// DeleteObject - Deletes a blob on azure container, uses Azure
+// equivalent DeleteBlob API.
+func (a AzureObjects) DeleteObject(bucket, object string) error {
+	err := a.client.DeleteBlob(bucket, object, nil)
+	if err != nil {
+		return azureToObjectError(traceError(err), bucket, object)
+	}
+	return nil
+}
+
+// ListMultipartUploads - Incomplete implementation, for now just return the prefix if it is an incomplete upload.
+// 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) {
+	result.MaxUploads = maxUploads
+	result.Prefix = prefix
+	result.Delimiter = delimiter
+	meta := a.metaInfo.get(prefix)
+	if meta == nil {
+		// In case minio was restarted after NewMultipartUpload and before CompleteMultipartUpload we expect
+		// the client to do a fresh upload so that any metadata like content-type are sent again in the
+		// NewMultipartUpload.
+		return result, nil
+	}
+	result.Uploads = []uploadMetadata{{prefix, prefix, time.Now().UTC(), "", nil}}
+	return result, nil
+}
+
+// NewMultipartUpload - Use Azure equivalent CreateBlockBlob.
+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.
+	uploadID = object
+	if metadata == nil {
+		// Store an empty map as a placeholder else ListObjectParts/PutObjectPart will not work properly.
+		metadata = make(map[string]string)
+	} else {
+		metadata = canonicalMetadata(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) {
+	return info, traceError(NotImplemented{})
+}
+
+// Encode partID+md5Hex to a blockID.
+func azureGetBlockID(partID int, md5Hex string) string {
+	return base64.StdEncoding.EncodeToString([]byte(fmt.Sprintf("%.5d.%s", partID, md5Hex)))
+}
+
+// Decode blockID to partID+md5Hex.
+func azureParseBlockID(blockID string) (int, string, error) {
+	idByte, err := base64.StdEncoding.DecodeString(blockID)
+	if err != nil {
+		return 0, "", traceError(err)
+	}
+	idStr := string(idByte)
+	splitRes := strings.Split(idStr, ".")
+	if len(splitRes) != 2 {
+		return 0, "", traceError(errUnexpected)
+	}
+	partID, err := strconv.Atoi(splitRes[0])
+	if err != nil {
+		return 0, "", traceError(err)
+	}
+	return partID, splitRes[1], nil
+}
+
+// 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) {
+	if meta := a.metaInfo.get(uploadID); meta == nil {
+		return info, traceError(InvalidUploadID{})
+	}
+	var sha256Writer hash.Hash
+	if sha256sum != "" {
+		sha256Writer = sha256.New()
+	}
+
+	teeReader := io.TeeReader(data, sha256Writer)
+
+	id := azureGetBlockID(partID, md5Hex)
+	err = a.client.PutBlockWithLength(bucket, object, id, uint64(size), teeReader, nil)
+	if err != nil {
+		return info, azureToObjectError(traceError(err), bucket, object)
+	}
+
+	if sha256sum != "" {
+		newSHA256sum := hex.EncodeToString(sha256Writer.Sum(nil))
+		if newSHA256sum != sha256sum {
+			return PartInfo{}, traceError(SHA256Mismatch{})
+		}
+	}
+
+	info.PartNumber = partID
+	info.ETag = md5Hex
+	info.LastModified = time.Now().UTC()
+	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) {
+	result.Bucket = bucket
+	result.Object = object
+	result.UploadID = uploadID
+	result.MaxParts = maxParts
+
+	if meta := a.metaInfo.get(uploadID); meta == nil {
+		return result, nil
+	}
+	resp, err := a.client.GetBlockList(bucket, object, storage.BlockListTypeUncommitted)
+	if err != nil {
+		return result, azureToObjectError(traceError(err), bucket, object)
+	}
+	tmpMaxParts := 0
+	partCount := 0 // Used for figuring out IsTruncated.
+	nextPartNumberMarker := 0
+	for _, part := range resp.UncommittedBlocks {
+		if tmpMaxParts == maxParts {
+			// Also takes care of the case if maxParts = 0
+			break
+		}
+		partCount++
+		partID, md5Hex, err := azureParseBlockID(part.Name)
+		if err != nil {
+			return result, err
+		}
+		if partID <= partNumberMarker {
+			continue
+		}
+		result.Parts = append(result.Parts, PartInfo{
+			partID,
+			time.Now().UTC(),
+			md5Hex,
+			part.Size,
+		})
+		tmpMaxParts++
+		nextPartNumberMarker = partID
+	}
+	if partCount < len(resp.UncommittedBlocks) {
+		result.IsTruncated = true
+		result.NextPartNumberMarker = nextPartNumberMarker
+	}
+
+	return result, nil
+}
+
+// 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 {
+	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) {
+	meta := a.metaInfo.get(uploadID)
+	if meta == nil {
+		return objInfo, traceError(InvalidUploadID{uploadID})
+	}
+	var blocks []storage.Block
+	for _, part := range uploadedParts {
+		blocks = append(blocks, storage.Block{
+			ID:     azureGetBlockID(part.PartNumber, part.ETag),
+			Status: storage.BlockStatusUncommitted,
+		})
+	}
+	err = a.client.PutBlockList(bucket, object, blocks)
+	if err != nil {
+		return objInfo, azureToObjectError(traceError(err), bucket, object)
+	}
+	if len(meta) > 0 {
+		prop := storage.BlobHeaders{
+			ContentMD5:      meta["Content-Md5"],
+			ContentLanguage: meta["Content-Language"],
+			ContentEncoding: meta["Content-Encoding"],
+			ContentType:     meta["Content-Type"],
+			CacheControl:    meta["Cache-Control"],
+		}
+		err = a.client.SetBlobProperties(bucket, object, prop)
+		if err != nil {
+			return objInfo, azureToObjectError(traceError(err), bucket, object)
+		}
+	}
+	a.metaInfo.del(uploadID)
+	return a.GetObjectInfo(bucket, object)
+}
+
+func anonErrToObjectErr(statusCode int, params ...string) error {
+	bucket := ""
+	object := ""
+	if len(params) >= 1 {
+		bucket = params[0]
+	}
+	if len(params) == 2 {
+		object = params[1]
+	}
+
+	switch statusCode {
+	case http.StatusNotFound:
+		if object != "" {
+			return ObjectNotFound{bucket, object}
+		}
+		return BucketNotFound{Bucket: bucket}
+	case http.StatusBadRequest:
+		if object != "" {
+			return ObjectNameInvalid{bucket, object}
+		}
+		return BucketNameInvalid{Bucket: bucket}
+	}
+	return errUnexpected
+}
+
+// Copied from github.com/Azure/azure-sdk-for-go/storage/blob.go
+func azureListBlobsGetParameters(p storage.ListBlobsParameters) url.Values {
+	out := url.Values{}
+
+	if p.Prefix != "" {
+		out.Set("prefix", p.Prefix)
+	}
+	if p.Delimiter != "" {
+		out.Set("delimiter", p.Delimiter)
+	}
+	if p.Marker != "" {
+		out.Set("marker", p.Marker)
+	}
+	if p.Include != "" {
+		out.Set("include", p.Include)
+	}
+	if p.MaxResults != 0 {
+		out.Set("maxresults", fmt.Sprintf("%v", p.MaxResults))
+	}
+	if p.Timeout != 0 {
+		out.Set("timeout", fmt.Sprintf("%v", p.Timeout))
+	}
+
+	return out
+}
+
+// SetBucketPolicies - Azure supports three types of container policies:
+// storage.ContainerAccessTypeContainer - readonly in minio terminology
+// storage.ContainerAccessTypeBlob - readonly without listing in minio terminology
+// 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, policies []BucketAccessPolicy) error {
+	prefix := bucket + "/*" // For all objects inside the bucket.
+	if len(policies) != 1 {
+		return traceError(NotImplemented{})
+	}
+	if policies[0].Prefix != prefix {
+		return traceError(NotImplemented{})
+	}
+	if policies[0].Policy != policy.BucketPolicyReadOnly {
+		return traceError(NotImplemented{})
+	}
+	perm := storage.ContainerPermissions{
+		AccessType:     storage.ContainerAccessTypeContainer,
+		AccessPolicies: nil,
+	}
+	err := a.client.SetContainerPermissions(bucket, perm, 0, "")
+	return azureToObjectError(traceError(err), bucket)
+}
+
+// GetBucketPolicies - Get the container ACL and convert it to canonical []bucketAccessPolicy
+func (a AzureObjects) GetBucketPolicies(bucket string) ([]BucketAccessPolicy, error) {
+	perm, err := a.client.GetContainerPermissions(bucket, 0, "")
+	if err != nil {
+		return nil, azureToObjectError(traceError(err), bucket)
+	}
+	switch perm.AccessType {
+	case storage.ContainerAccessTypePrivate:
+		return nil, nil
+	case storage.ContainerAccessTypeContainer:
+		return []BucketAccessPolicy{{"", policy.BucketPolicyReadOnly}}, nil
+	}
+	return nil, azureToObjectError(traceError(NotImplemented{}))
+}
+
+// DeleteBucketPolicies - Set the container ACL to "private"
+func (a AzureObjects) DeleteBucketPolicies(bucket string) error {
+	perm := storage.ContainerPermissions{
+		AccessType:     storage.ContainerAccessTypePrivate,
+		AccessPolicies: nil,
+	}
+	err := a.client.SetContainerPermissions(bucket, perm, 0, "")
+	return azureToObjectError(traceError(err))
+}

cmd/azure_test.go

@@ -0,0 +1,142 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"net/http"
+	"reflect"
+	"testing"
+
+	"github.com/Azure/azure-sdk-for-go/storage"
+)
+
+// Test canonical metadata.
+func TestCanonicalMetadata(t *testing.T) {
+	metadata := map[string]string{
+		"accept-encoding":  "gzip",
+		"content-encoding": "gzip",
+	}
+	expectedCanonicalM := 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)
+	}
+}
+
+// Add tests for azure to object error.
+func TestAzureToObjectError(t *testing.T) {
+	testCases := []struct {
+		actualErr      error
+		expectedErr    error
+		bucket, object string
+	}{
+		{
+			nil, nil, "", "",
+		},
+		{
+			traceError(errUnexpected), errUnexpected, "", "",
+		},
+		{
+			traceError(errUnexpected), traceError(errUnexpected), "", "",
+		},
+		{
+			traceError(storage.AzureStorageServiceError{
+				Code: "ContainerAlreadyExists",
+			}), BucketExists{Bucket: "bucket"}, "bucket", "",
+		},
+		{
+			traceError(storage.AzureStorageServiceError{
+				Code: "InvalidResourceName",
+			}), BucketNameInvalid{Bucket: "bucket."}, "bucket.", "",
+		},
+		{
+			traceError(storage.AzureStorageServiceError{
+				StatusCode: http.StatusNotFound,
+			}), ObjectNotFound{
+				Bucket: "bucket",
+				Object: "object",
+			}, "bucket", "object",
+		},
+		{
+			traceError(storage.AzureStorageServiceError{
+				StatusCode: http.StatusNotFound,
+			}), BucketNotFound{Bucket: "bucket"}, "bucket", "",
+		},
+		{
+			traceError(storage.AzureStorageServiceError{
+				StatusCode: http.StatusBadRequest,
+			}), BucketNameInvalid{Bucket: "bucket."}, "bucket.", "",
+		},
+	}
+	for i, testCase := range testCases {
+		err := azureToObjectError(testCase.actualErr, testCase.bucket, testCase.object)
+		if err != nil {
+			if err.Error() != testCase.expectedErr.Error() {
+				t.Errorf("Test %d: Expected error %s, got %s", i+1, testCase.expectedErr, err)
+			}
+		}
+	}
+}
+
+// Test azureGetBlockID().
+func TestAzureGetBlockID(t *testing.T) {
+	testCases := []struct {
+		partID  int
+		md5     string
+		blockID string
+	}{
+		{1, "d41d8cd98f00b204e9800998ecf8427e", "MDAwMDEuZDQxZDhjZDk4ZjAwYjIwNGU5ODAwOTk4ZWNmODQyN2U="},
+		{2, "a7fb6b7b36ee4ed66b5546fac4690273", "MDAwMDIuYTdmYjZiN2IzNmVlNGVkNjZiNTU0NmZhYzQ2OTAyNzM="},
+	}
+	for _, test := range testCases {
+		blockID := azureGetBlockID(test.partID, test.md5)
+		if blockID != test.blockID {
+			t.Fatalf("%s is not equal to %s", blockID, test.blockID)
+		}
+	}
+}
+
+// Test azureParseBlockID().
+func TestAzureParseBlockID(t *testing.T) {
+	testCases := []struct {
+		partID  int
+		md5     string
+		blockID string
+	}{
+		{1, "d41d8cd98f00b204e9800998ecf8427e", "MDAwMDEuZDQxZDhjZDk4ZjAwYjIwNGU5ODAwOTk4ZWNmODQyN2U="},
+		{2, "a7fb6b7b36ee4ed66b5546fac4690273", "MDAwMDIuYTdmYjZiN2IzNmVlNGVkNjZiNTU0NmZhYzQ2OTAyNzM="},
+	}
+	for _, test := range testCases {
+		partID, md5, err := azureParseBlockID(test.blockID)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if partID != test.partID {
+			t.Fatalf("%d not equal to %d", partID, test.partID)
+		}
+		if md5 != test.md5 {
+			t.Fatalf("%s not equal to %s", md5, test.md5)
+		}
+	}
+	_, _, err := azureParseBlockID("junk")
+	if err == nil {
+		t.Fatal("Expected azureParseBlockID() to return error")
+	}
+}

cmd/bucket-handlers.go

@@ -49,6 +49,10 @@ func enforceBucketPolicy(bucket, action, resource, referer string, queryParams u
 		return ErrInternalError
 	}
 
+	if globalBucketPolicies == nil {
+		return ErrAccessDenied
+	}
+
 	// Fetch bucket policy, if policy is not set return access denied.
 	policy := globalBucketPolicies.GetBucketPolicy(bucket)
 	if policy == nil {

cmd/credential.go

@@ -27,19 +27,41 @@ import (
 )
 
 const (
-	accessKeyMinLen = 5
-	accessKeyMaxLen = 20
-	secretKeyMinLen = 8
-	secretKeyMaxLen = 40
-
-	alphaNumericTable    = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-	alphaNumericTableLen = byte(len(alphaNumericTable))
+	accessKeyMinLen       = 5
+	accessKeyMaxLen       = 20
+	secretKeyMinLen       = 8
+	secretKeyMaxLenAmazon = 40
+	alphaNumericTable     = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	alphaNumericTableLen  = byte(len(alphaNumericTable))
 )
 
 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")
 )
+var secretKeyMaxLen = secretKeyMaxLenAmazon
+
+func mustGetAccessKey() string {
+	keyBytes := make([]byte, accessKeyMaxLen)
+	if _, err := rand.Read(keyBytes); err != nil {
+		console.Fatalf("Unable to generate access key. Err: %s.\n", err)
+	}
+
+	for i := 0; i < accessKeyMaxLen; i++ {
+		keyBytes[i] = alphaNumericTable[keyBytes[i]%alphaNumericTableLen]
+	}
+
+	return string(keyBytes)
+}
+
+func mustGetSecretKey() string {
+	keyBytes := make([]byte, secretKeyMaxLen)
+	if _, err := rand.Read(keyBytes); err != nil {
+		console.Fatalf("Unable to generate secret key. Err: %s.\n", err)
+	}
+
+	return string([]byte(base64.StdEncoding.EncodeToString(keyBytes))[:secretKeyMaxLen])
+}
 
 // isAccessKeyValid - validate access key for right length.
 func isAccessKeyValid(accessKey string) bool {

cmd/event-notifier.go

@@ -313,6 +313,9 @@ func eventNotifyForBucketListeners(eventType, objectName, bucketName string,
 // eventNotify notifies an event to relevant targets based on their
 // bucket configuration (notifications and listeners).
 func eventNotify(event eventData) {
+	if globalEventNotifier == nil {
+		return
+	}
 	// Notifies a new event.
 	// List of events reported through this function are
 	//  - s3:ObjectCreated:Put

cmd/gateway-handlers.go

@@ -0,0 +1,703 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"net/http"
+
+	"encoding/json"
+	"encoding/xml"
+
+	router "github.com/gorilla/mux"
+	"github.com/minio/minio-go/pkg/policy"
+)
+
+// GetObjectHandler - GET Object
+// ----------
+// This implementation of the GET operation retrieves object. To use GET,
+// you must have READ access to the object.
+func (api gatewayAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
+	var object, bucket string
+	vars := router.Vars(r)
+	bucket = vars["bucket"]
+	object = vars["object"]
+
+	// Fetch object stat info.
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	reqAuthType := getRequestAuthType(r)
+
+	switch reqAuthType {
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		s3Error := isReqAuthenticatedV2(r)
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	case authTypeSigned, authTypePresigned:
+		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	}
+
+	getObjectInfo := objectAPI.GetObjectInfo
+	if reqAuthType == authTypeAnonymous {
+		getObjectInfo = objectAPI.AnonGetObjectInfo
+	}
+	objInfo, err := getObjectInfo(bucket, object)
+	if err != nil {
+		errorIf(err, "Unable to fetch object info.")
+		apiErr := toAPIErrorCode(err)
+		if apiErr == ErrNoSuchKey {
+			apiErr = errAllowableObjectNotFound(bucket, r)
+		}
+		writeErrorResponse(w, apiErr, r.URL)
+		return
+	}
+
+	// Get request range.
+	var hrange *httpRange
+	rangeHeader := r.Header.Get("Range")
+	if rangeHeader != "" {
+		if hrange, err = parseRequestRange(rangeHeader, objInfo.Size); err != nil {
+			// Handle only errInvalidRange
+			// Ignore other parse error and treat it as regular Get request like Amazon S3.
+			if err == errInvalidRange {
+				writeErrorResponse(w, ErrInvalidRange, r.URL)
+				return
+			}
+
+			// log the error.
+			errorIf(err, "Invalid request range")
+		}
+	}
+
+	// Validate pre-conditions if any.
+	if checkPreconditions(w, r, objInfo) {
+		return
+	}
+
+	// Get the object.
+	var startOffset int64
+	length := objInfo.Size
+	if hrange != nil {
+		startOffset = hrange.offsetBegin
+		length = hrange.getLength()
+	}
+	// Indicates if any data was written to the http.ResponseWriter
+	dataWritten := false
+	// io.Writer type which keeps track if any data was written.
+	writer := funcToWriter(func(p []byte) (int, error) {
+		if !dataWritten {
+			// Set headers on the first write.
+			// Set standard object headers.
+			setObjectHeaders(w, objInfo, hrange)
+
+			// Set any additional requested response headers.
+			setGetRespHeaders(w, r.URL.Query())
+
+			dataWritten = true
+		}
+		return w.Write(p)
+	})
+
+	getObject := objectAPI.GetObject
+	if reqAuthType == authTypeAnonymous {
+		getObject = objectAPI.AnonGetObject
+	}
+
+	// Reads the object at startOffset and writes to mw.
+	if err := getObject(bucket, object, startOffset, length, writer); err != nil {
+		errorIf(err, "Unable to write to client.")
+		if !dataWritten {
+			// Error response only if no data has been written to client yet. i.e if
+			// partial data has already been written before an error
+			// occurred then no point in setting StatusCode and
+			// sending error XML.
+			writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		}
+		return
+	}
+	if !dataWritten {
+		// If ObjectAPI.GetObject did not return error and no data has
+		// been written it would mean that it is a 0-byte object.
+		// call wrter.Write(nil) to set appropriate headers.
+		writer.Write(nil)
+	}
+}
+
+// HeadObjectHandler - HEAD Object
+// -----------
+// The HEAD operation retrieves metadata from an object without returning the object itself.
+func (api gatewayAPIHandlers) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
+	var object, bucket string
+	vars := router.Vars(r)
+	bucket = vars["bucket"]
+	object = vars["object"]
+
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponseHeadersOnly(w, ErrServerNotInitialized)
+		return
+	}
+
+	reqAuthType := getRequestAuthType(r)
+
+	switch reqAuthType {
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		s3Error := isReqAuthenticatedV2(r)
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	case authTypeSigned, authTypePresigned:
+		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	}
+
+	getObjectInfo := objectAPI.GetObjectInfo
+	if reqAuthType == authTypeAnonymous {
+		getObjectInfo = objectAPI.AnonGetObjectInfo
+	}
+	objInfo, err := getObjectInfo(bucket, object)
+	if err != nil {
+		errorIf(err, "Unable to fetch object info.")
+		apiErr := toAPIErrorCode(err)
+		if apiErr == ErrNoSuchKey {
+			apiErr = errAllowableObjectNotFound(bucket, r)
+		}
+		writeErrorResponse(w, apiErr, r.URL)
+		return
+	}
+
+	// Validate pre-conditions if any.
+	if checkPreconditions(w, r, objInfo) {
+		return
+	}
+
+	// Set standard object headers.
+	setObjectHeaders(w, objInfo, nil)
+
+	// Successful response.
+	w.WriteHeader(http.StatusOK)
+}
+
+// DeleteMultipleObjectsHandler - deletes multiple objects.
+func (api gatewayAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Request) {
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	if s3Error := checkRequestAuthType(r, bucket, "s3:DeleteObject", serverConfig.GetRegion()); s3Error != ErrNone {
+		writeErrorResponse(w, s3Error, r.URL)
+		return
+	}
+
+	// Content-Length is required and should be non-zero
+	// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
+	if r.ContentLength <= 0 {
+		writeErrorResponse(w, ErrMissingContentLength, r.URL)
+		return
+	}
+
+	// Content-Md5 is requied should be set
+	// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
+	if _, ok := r.Header["Content-Md5"]; !ok {
+		writeErrorResponse(w, ErrMissingContentMD5, r.URL)
+		return
+	}
+
+	// Allocate incoming content length bytes.
+	deleteXMLBytes := make([]byte, r.ContentLength)
+
+	// Read incoming body XML bytes.
+	if _, err := io.ReadFull(r.Body, deleteXMLBytes); err != nil {
+		errorIf(err, "Unable to read HTTP body.")
+		writeErrorResponse(w, ErrInternalError, r.URL)
+		return
+	}
+
+	// Unmarshal list of keys to be deleted.
+	deleteObjects := &DeleteObjectsRequest{}
+	if err := xml.Unmarshal(deleteXMLBytes, deleteObjects); err != nil {
+		errorIf(err, "Unable to unmarshal delete objects request XML.")
+		writeErrorResponse(w, ErrMalformedXML, r.URL)
+		return
+	}
+
+	var dErrs = make([]error, len(deleteObjects.Objects))
+
+	// Delete all requested objects in parallel.
+	for index, object := range deleteObjects.Objects {
+		dErr := objectAPI.DeleteObject(bucket, object.ObjectName)
+		if dErr != nil {
+			dErrs[index] = dErr
+		}
+	}
+
+	// Collect deleted objects and errors if any.
+	var deletedObjects []ObjectIdentifier
+	var deleteErrors []DeleteError
+	for index, err := range dErrs {
+		object := deleteObjects.Objects[index]
+		// Success deleted objects are collected separately.
+		if err == nil {
+			deletedObjects = append(deletedObjects, object)
+			continue
+		}
+		if _, ok := errorCause(err).(ObjectNotFound); ok {
+			// If the object is not found it should be
+			// accounted as deleted as per S3 spec.
+			deletedObjects = append(deletedObjects, object)
+			continue
+		}
+		errorIf(err, "Unable to delete object. %s", object.ObjectName)
+		// Error during delete should be collected separately.
+		deleteErrors = append(deleteErrors, DeleteError{
+			Code:    errorCodeResponse[toAPIErrorCode(err)].Code,
+			Message: errorCodeResponse[toAPIErrorCode(err)].Description,
+			Key:     object.ObjectName,
+		})
+	}
+
+	// Generate response
+	response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors)
+	encodedSuccessResponse := encodeResponse(response)
+
+	// Write success response.
+	writeSuccessResponseXML(w, encodedSuccessResponse)
+}
+
+// PutBucketPolicyHandler - PUT Bucket policy
+// -----------------
+// This implementation of the PUT operation uses the policy
+// subresource to add to or replace a policy on a bucket
+func (api gatewayAPIHandlers) PutBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
+	objAPI := api.ObjectAPI()
+	if objAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	if s3Error := checkRequestAuthType(r, "", "", serverConfig.GetRegion()); s3Error != ErrNone {
+		writeErrorResponse(w, s3Error, r.URL)
+		return
+	}
+
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	// Before proceeding validate if bucket exists.
+	_, err := objAPI.GetBucketInfo(bucket)
+	if err != nil {
+		errorIf(err, "Unable to find bucket info.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	// If Content-Length is unknown or zero, deny the
+	// request. PutBucketPolicy always needs a Content-Length.
+	if r.ContentLength == -1 || r.ContentLength == 0 {
+		writeErrorResponse(w, ErrMissingContentLength, r.URL)
+		return
+	}
+	// If Content-Length is greater than maximum allowed policy size.
+	if r.ContentLength > maxAccessPolicySize {
+		writeErrorResponse(w, ErrEntityTooLarge, r.URL)
+		return
+	}
+
+	// Read access policy up to maxAccessPolicySize.
+	// http://docs.aws.amazon.com/AmazonS3/latest/dev/access-policy-language-overview.html
+	// bucket policies are limited to 20KB in size, using a limit reader.
+	policyBytes, err := ioutil.ReadAll(io.LimitReader(r.Body, maxAccessPolicySize))
+	if err != nil {
+		errorIf(err, "Unable to read from client.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	{
+		// FIXME: consolidate bucketPolicy and policy.BucketAccessPolicy so that
+		// the verification below is done on the same type.
+		// Parse bucket policy.
+		policyInfo := &bucketPolicy{}
+		err = parseBucketPolicy(bytes.NewReader(policyBytes), policyInfo)
+		if err != nil {
+			errorIf(err, "Unable to parse bucket policy.")
+			writeErrorResponse(w, ErrInvalidPolicyDocument, r.URL)
+			return
+		}
+
+		// Parse check bucket policy.
+		if s3Error := checkBucketPolicyResources(bucket, policyInfo); s3Error != ErrNone {
+			writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+			return
+		}
+	}
+	policyInfo := &policy.BucketAccessPolicy{}
+	if err = json.Unmarshal(policyBytes, policyInfo); err != nil {
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+	var policies []BucketAccessPolicy
+	for prefix, policy := range policy.GetPolicies(policyInfo.Statements, bucket) {
+		policies = append(policies, BucketAccessPolicy{
+			Prefix: prefix,
+			Policy: policy,
+		})
+	}
+	if err = objAPI.SetBucketPolicies(bucket, policies); err != nil {
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+	// Success.
+	writeSuccessNoContent(w)
+}
+
+// DeleteBucketPolicyHandler - DELETE Bucket policy
+// -----------------
+// This implementation of the DELETE operation uses the policy
+// subresource to add to remove a policy on a bucket.
+func (api gatewayAPIHandlers) DeleteBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
+	objAPI := api.ObjectAPI()
+	if objAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	if s3Error := checkRequestAuthType(r, "", "", serverConfig.GetRegion()); s3Error != ErrNone {
+		writeErrorResponse(w, s3Error, r.URL)
+		return
+	}
+
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	// Before proceeding validate if bucket exists.
+	_, err := objAPI.GetBucketInfo(bucket)
+	if err != nil {
+		errorIf(err, "Unable to find bucket info.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	// Delete bucket access policy, by passing an empty policy
+	// struct.
+	objAPI.DeleteBucketPolicies(bucket)
+	// Success.
+	writeSuccessNoContent(w)
+}
+
+// GetBucketPolicyHandler - GET Bucket policy
+// -----------------
+// This operation uses the policy
+// subresource to return the policy of a specified bucket.
+func (api gatewayAPIHandlers) GetBucketPolicyHandler(w http.ResponseWriter, r *http.Request) {
+	objAPI := api.ObjectAPI()
+	if objAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	if s3Error := checkRequestAuthType(r, "", "", serverConfig.GetRegion()); s3Error != ErrNone {
+		writeErrorResponse(w, s3Error, r.URL)
+		return
+	}
+
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	// Before proceeding validate if bucket exists.
+	_, err := objAPI.GetBucketInfo(bucket)
+	if err != nil {
+		errorIf(err, "Unable to find bucket info.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	policies, err := objAPI.GetBucketPolicies(bucket)
+	if err != nil {
+		errorIf(err, "Unable to read bucket policy.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+	policyInfo := policy.BucketAccessPolicy{Version: "2012-10-17"}
+	for _, p := range policies {
+		policyInfo.Statements = policy.SetPolicy(policyInfo.Statements, p.Policy, bucket, p.Prefix)
+	}
+	policyBytes, err := json.Marshal(&policyInfo)
+	if err != nil {
+		errorIf(err, "Unable to read bucket policy.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+	// Write to client.
+	w.Write(policyBytes)
+}
+
+// GetBucketNotificationHandler - This implementation of the GET
+// operation uses the notification subresource to return the
+// notification configuration of a bucket. If notifications are
+// not enabled on the bucket, the operation returns an empty
+// NotificationConfiguration element.
+func (api gatewayAPIHandlers) GetBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
+	writeErrorResponse(w, ErrNotImplemented, r.URL)
+}
+
+// PutBucketNotificationHandler - Minio notification feature enables
+// you to receive notifications when certain events happen in your bucket.
+// Using this API, you can replace an existing notification configuration.
+// The configuration is an XML file that defines the event types that you
+// want Minio to publish and the destination where you want Minio to publish
+// an event notification when it detects an event of the specified type.
+// By default, your bucket has no event notifications configured. That is,
+// the notification configuration will be an empty NotificationConfiguration.
+func (api gatewayAPIHandlers) PutBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
+	writeErrorResponse(w, ErrNotImplemented, r.URL)
+}
+
+// ListenBucketNotificationHandler - list bucket notifications.
+func (api gatewayAPIHandlers) ListenBucketNotificationHandler(w http.ResponseWriter, r *http.Request) {
+	writeErrorResponse(w, ErrNotImplemented, r.URL)
+}
+
+// DeleteBucketHandler - Delete bucket
+func (api gatewayAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	// DeleteBucket does not have any bucket action.
+	if s3Error := checkRequestAuthType(r, "", "", serverConfig.GetRegion()); s3Error != ErrNone {
+		writeErrorResponse(w, s3Error, r.URL)
+		return
+	}
+
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	// Attempt to delete bucket.
+	if err := objectAPI.DeleteBucket(bucket); err != nil {
+		errorIf(err, "Unable to delete a bucket.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	// Write success response.
+	writeSuccessNoContent(w)
+}
+
+// ListObjectsV1Handler - GET Bucket (List Objects) Version 1.
+// --------------------------
+// This implementation of the GET operation returns some or all (up to 1000)
+// of the objects in a bucket. You can use the request parameters as selection
+// criteria to return a subset of the objects in a bucket.
+//
+func (api gatewayAPIHandlers) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+
+	reqAuthType := getRequestAuthType(r)
+
+	switch reqAuthType {
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		s3Error := isReqAuthenticatedV2(r)
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	case authTypeSigned, authTypePresigned:
+		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	}
+
+	// Extract all the litsObjectsV1 query params to their native values.
+	prefix, marker, delimiter, maxKeys, _ := getListObjectsV1Args(r.URL.Query())
+
+	// Validate all the query params before beginning to serve the request.
+	if s3Error := validateListObjectsArgs(prefix, marker, delimiter, maxKeys); s3Error != ErrNone {
+		writeErrorResponse(w, s3Error, r.URL)
+		return
+	}
+
+	listObjects := objectAPI.ListObjects
+	if reqAuthType == authTypeAnonymous {
+		listObjects = objectAPI.AnonListObjects
+	}
+	// Inititate a list objects operation based on the input params.
+	// On success would return back ListObjectsInfo object to be
+	// marshalled into S3 compatible XML header.
+	listObjectsInfo, err := listObjects(bucket, prefix, marker, delimiter, maxKeys)
+	if err != nil {
+		errorIf(err, "Unable to list objects.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+	response := generateListObjectsV1Response(bucket, prefix, marker, delimiter, maxKeys, listObjectsInfo)
+
+	// Write success response.
+	writeSuccessResponseXML(w, encodeResponse(response))
+}
+
+// HeadBucketHandler - HEAD Bucket
+// ----------
+// This operation is useful to determine if a bucket exists.
+// The operation returns a 200 OK if the bucket exists and you
+// have permission to access it. Otherwise, the operation might
+// return responses such as 404 Not Found and 403 Forbidden.
+func (api gatewayAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponseHeadersOnly(w, ErrServerNotInitialized)
+		return
+	}
+
+	reqAuthType := getRequestAuthType(r)
+
+	switch reqAuthType {
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		s3Error := isReqAuthenticatedV2(r)
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	case authTypeSigned, authTypePresigned:
+		s3Error := isReqAuthenticated(r, serverConfig.GetRegion())
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	}
+
+	getBucketInfo := objectAPI.GetBucketInfo
+	if reqAuthType == authTypeAnonymous {
+		getBucketInfo = objectAPI.AnonGetBucketInfo
+	}
+
+	if _, err := getBucketInfo(bucket); err != nil {
+		errorIf(err, "Unable to fetch bucket info.")
+		writeErrorResponseHeadersOnly(w, toAPIErrorCode(err))
+		return
+	}
+
+	writeSuccessResponseHeadersOnly(w)
+}
+
+// GetBucketLocationHandler - GET Bucket location.
+// -------------------------
+// This operation returns bucket location.
+func (api gatewayAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *http.Request) {
+	vars := router.Vars(r)
+	bucket := vars["bucket"]
+
+	objectAPI := api.ObjectAPI()
+	if objectAPI == nil {
+		writeErrorResponse(w, ErrServerNotInitialized, r.URL)
+		return
+	}
+	reqAuthType := getRequestAuthType(r)
+
+	switch reqAuthType {
+	case authTypePresignedV2, authTypeSignedV2:
+		// Signature V2 validation.
+		s3Error := isReqAuthenticatedV2(r)
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	case authTypeSigned, authTypePresigned:
+		s3Error := isReqAuthenticated(r, globalMinioDefaultRegion)
+		if s3Error == ErrInvalidRegion {
+			// Clients like boto3 send getBucketLocation() call signed with region that is configured.
+			s3Error = isReqAuthenticated(r, serverConfig.GetRegion())
+		}
+		if s3Error != ErrNone {
+			errorIf(errSignatureMismatch, dumpRequest(r))
+			writeErrorResponse(w, s3Error, r.URL)
+			return
+		}
+	}
+
+	getBucketInfo := objectAPI.GetBucketInfo
+	if reqAuthType == authTypeAnonymous {
+		getBucketInfo = objectAPI.AnonGetBucketInfo
+	}
+
+	if _, err := getBucketInfo(bucket); err != nil {
+		errorIf(err, "Unable to fetch bucket info.")
+		writeErrorResponse(w, toAPIErrorCode(err), r.URL)
+		return
+	}
+
+	// Generate response.
+	encodedSuccessResponse := encodeResponse(LocationResponse{})
+	// Get current region.
+	region := serverConfig.GetRegion()
+	if region != globalMinioDefaultRegion {
+		encodedSuccessResponse = encodeResponse(LocationResponse{
+			Location: region,
+		})
+	}
+
+	// Write success response.
+	writeSuccessResponseXML(w, encodedSuccessResponse)
+}

cmd/gateway-main.go

@@ -0,0 +1,219 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/gorilla/mux"
+	"github.com/minio/cli"
+	"github.com/minio/mc/pkg/console"
+)
+
+var gatewayTemplate = `NAME:
+  {{.HelpName}} - {{.Usage}}
+
+USAGE:
+  {{.HelpName}} {{if .VisibleFlags}}[FLAGS]{{end}} BACKEND
+{{if .VisibleFlags}}
+FLAGS:
+  {{range .VisibleFlags}}{{.}}
+  {{end}}{{end}}
+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.
+
+EXAMPLES:
+  1. Start minio gateway server for Azure Blob Storage backend.
+      $ {{.HelpName}} azure
+
+  2. Start minio gateway server bound to a specific ADDRESS:PORT.
+      $ {{.HelpName}} --address 192.168.1.101:9000 azure
+`
+
+var gatewayCmd = cli.Command{
+	Name:               "gateway",
+	Usage:              "Start object storage gateway server.",
+	Action:             gatewayMain,
+	CustomHelpTemplate: gatewayTemplate,
+	Flags: append(serverFlags, cli.BoolFlag{
+		Name:  "quiet",
+		Usage: "Disable startup banner.",
+	}),
+	HideHelpCommand: true,
+}
+
+// Represents the type of the gateway backend.
+type gatewayBackend string
+
+const (
+	azureBackend gatewayBackend = "azure"
+	// Add more backends here.
+)
+
+// Returns access and secretkey set from environment variables.
+func mustGetGatewayCredsFromEnv() (accessKey, secretKey string) {
+	// Fetch access keys from environment variables.
+	accessKey = os.Getenv("MINIO_ACCESS_KEY")
+	secretKey = os.Getenv("MINIO_SECRET_KEY")
+	if accessKey == "" || secretKey == "" {
+		console.Fatalln("Access and secret keys are mandatory to run Minio gateway server.")
+	}
+	return accessKey, secretKey
+}
+
+// Initialize gateway layer depending on the backend type.
+// Supported backend types are
+//
+// - Azure Blob Storage.
+// - Add your favorite backend here.
+func newGatewayLayer(backendType, accessKey, secretKey string) (GatewayLayer, error) {
+	if gatewayBackend(backendType) != azureBackend {
+		return nil, fmt.Errorf("Unrecognized backend type %s", backendType)
+	}
+	return newAzureLayer(accessKey, secretKey)
+}
+
+// Initialize a new gateway config.
+//
+// DO NOT save this config, this is meant to be
+// only used in memory.
+func newGatewayConfig(accessKey, secretKey, region string) error {
+	// Initialize server config.
+	srvCfg := newServerConfigV14()
+
+	// If env is set for a fresh start, save them to config file.
+	srvCfg.SetCredential(credential{
+		AccessKey: accessKey,
+		SecretKey: secretKey,
+	})
+
+	// Set default printing to console.
+	srvCfg.Logger.SetConsole(consoleLogger{true, "error"})
+
+	// Set custom region.
+	srvCfg.SetRegion(region)
+
+	// Create certs path for SSL configuration.
+	if err := createConfigDir(); err != nil {
+		return err
+	}
+
+	// hold the mutex lock before a new config is assigned.
+	// Save the new config globally.
+	// unlock the mutex.
+	serverConfigMu.Lock()
+	serverConfig = srvCfg
+	serverConfigMu.Unlock()
+
+	return nil
+}
+
+// Handler for 'minio gateway'.
+func gatewayMain(ctx *cli.Context) {
+	if !ctx.Args().Present() || ctx.Args().First() == "help" {
+		cli.ShowCommandHelpAndExit(ctx, "gateway", 1)
+	}
+
+	// Fetch access and secret key from env.
+	accessKey, secretKey := mustGetGatewayCredsFromEnv()
+
+	// 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"
+	err := newGatewayConfig(accessKey, secretKey, "us-east-1")
+	if err != nil {
+		console.Fatalf("Unable to initialize gateway config. Error: %s", err)
+	}
+
+	// Enable console logging.
+	enableConsoleLogger()
+
+	// Get quiet flag from command line argument.
+	quietFlag := ctx.Bool("quiet") || ctx.GlobalBool("quiet")
+
+	// First argument is selected backend type.
+	backendType := ctx.Args().First()
+
+	newObject, err := newGatewayLayer(backendType, accessKey, secretKey)
+	if err != nil {
+		console.Fatalf("Unable to initialize gateway layer. Error: %s", err)
+	}
+
+	initNSLock(false) // Enable local namespace lock.
+
+	router := mux.NewRouter().SkipClean(true)
+	registerGatewayAPIRouter(router, newObject)
+
+	var handlerFns = []HandlerFunc{
+		// Limits all requests size to a maximum fixed limit
+		setRequestSizeLimitHandler,
+		// Adds 'crossdomain.xml' policy handler to serve legacy flash clients.
+		setCrossDomainPolicy,
+		// Validates all incoming requests to have a valid date header.
+		setTimeValidityHandler,
+		// CORS setting for all browser API requests.
+		setCorsHandler,
+		// Validates all incoming URL resources, for invalid/unsupported
+		// resources client receives a HTTP error.
+		setIgnoreResourcesHandler,
+		// Auth handler verifies incoming authorization headers and
+		// routes them accordingly. Client receives a HTTP error for
+		// invalid/unsupported signatures.
+		setAuthHandler,
+	}
+
+	apiServer := NewServerMux(ctx.String("address"), registerHandlers(router, handlerFns...))
+
+	// Set if we are SSL enabled S3 gateway.
+	globalIsSSL = isSSL()
+
+	// Start server, automatically configures TLS if certs are available.
+	go func() {
+		cert, key := "", ""
+		if globalIsSSL {
+			cert, key = getPublicCertFile(), getPrivateKeyFile()
+		}
+		if aerr := apiServer.ListenAndServe(cert, key); aerr != nil {
+			console.Fatalf("Failed to start minio server. Error: %s\n", aerr)
+		}
+	}()
+
+	apiEndPoints, err := finalizeAPIEndpoints(apiServer.Addr)
+	fatalIf(err, "Unable to finalize API endpoints for %s", apiServer.Addr)
+
+	// Once endpoints are finalized, initialize the new object api.
+	globalObjLayerMutex.Lock()
+	globalObjectAPI = newObject
+	globalObjLayerMutex.Unlock()
+
+	// Prints the formatted startup message once object layer is initialized.
+	if !quietFlag {
+		mode := ""
+		if gatewayBackend(backendType) == azureBackend {
+			mode = globalMinioModeGatewayAzure
+		}
+		checkUpdate(mode)
+		printGatewayStartupMessage(apiEndPoints, accessKey, secretKey, backendType)
+	}
+
+	<-globalServiceDoneCh
+}

cmd/gateway-router.go

@@ -0,0 +1,122 @@
+/*
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"io"
+
+	router "github.com/gorilla/mux"
+)
+
+// GatewayLayer - Interface to implement gateway mode.
+type GatewayLayer interface {
+	ObjectLayer
+	AnonGetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) (err error)
+	AnonGetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error)
+	SetBucketPolicies(string, []BucketAccessPolicy) error
+	GetBucketPolicies(string) ([]BucketAccessPolicy, error)
+	DeleteBucketPolicies(string) error
+	AnonListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error)
+	AnonGetBucketInfo(bucket string) (bucketInfo BucketInfo, err error)
+}
+
+// Implements and provides http handlers for S3 API.
+// Overrides GetObject HeadObject and Policy related handlers.
+type gatewayAPIHandlers struct {
+	objectAPIHandlers
+	ObjectAPI func() GatewayLayer
+}
+
+// registerAPIRouter - registers S3 compatible APIs.
+func registerGatewayAPIRouter(mux *router.Router, gw GatewayLayer) {
+	// Initialize API.
+	api := gatewayAPIHandlers{
+		ObjectAPI: func() GatewayLayer { return gw },
+		objectAPIHandlers: objectAPIHandlers{
+			ObjectAPI: newObjectLayerFn,
+		},
+	}
+
+	// API Router
+	apiRouter := mux.NewRoute().PathPrefix("/").Subrouter()
+
+	// Bucket router
+	bucket := apiRouter.PathPrefix("/{bucket}").Subrouter()
+
+	/// Object operations
+
+	// HeadObject
+	bucket.Methods("HEAD").Path("/{object:.+}").HandlerFunc(api.HeadObjectHandler)
+	// CopyObjectPart
+	bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", ".*?(\\/|%2F).*?").HandlerFunc(api.CopyObjectPartHandler).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}")
+	// PutObjectPart
+	bucket.Methods("PUT").Path("/{object:.+}").HandlerFunc(api.PutObjectPartHandler).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}")
+	// ListObjectPxarts
+	bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(api.ListObjectPartsHandler).Queries("uploadId", "{uploadId:.*}")
+	// CompleteMultipartUpload
+	bucket.Methods("POST").Path("/{object:.+}").HandlerFunc(api.CompleteMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}")
+	// NewMultipartUpload
+	bucket.Methods("POST").Path("/{object:.+}").HandlerFunc(api.NewMultipartUploadHandler).Queries("uploads", "")
+	// AbortMultipartUpload
+	bucket.Methods("DELETE").Path("/{object:.+}").HandlerFunc(api.AbortMultipartUploadHandler).Queries("uploadId", "{uploadId:.*}")
+	// GetObject
+	bucket.Methods("GET").Path("/{object:.+}").HandlerFunc(api.GetObjectHandler)
+	// CopyObject
+	bucket.Methods("PUT").Path("/{object:.+}").HeadersRegexp("X-Amz-Copy-Source", ".*?(\\/|%2F).*?").HandlerFunc(api.CopyObjectHandler)
+	// PutObject
+	bucket.Methods("PUT").Path("/{object:.+}").HandlerFunc(api.PutObjectHandler)
+	// DeleteObject
+	bucket.Methods("DELETE").Path("/{object:.+}").HandlerFunc(api.DeleteObjectHandler)
+
+	/// Bucket operations
+
+	// GetBucketLocation
+	bucket.Methods("GET").HandlerFunc(api.GetBucketLocationHandler).Queries("location", "")
+	// GetBucketPolicy
+	bucket.Methods("GET").HandlerFunc(api.GetBucketPolicyHandler).Queries("policy", "")
+	// GetBucketNotification
+	bucket.Methods("GET").HandlerFunc(api.GetBucketNotificationHandler).Queries("notification", "")
+	// ListenBucketNotification
+	bucket.Methods("GET").HandlerFunc(api.ListenBucketNotificationHandler).Queries("events", "{events:.*}")
+	// ListMultipartUploads
+	bucket.Methods("GET").HandlerFunc(api.ListMultipartUploadsHandler).Queries("uploads", "")
+	// ListObjectsV2
+	bucket.Methods("GET").HandlerFunc(api.ListObjectsV2Handler).Queries("list-type", "2")
+	// ListObjectsV1 (Legacy)
+	bucket.Methods("GET").HandlerFunc(api.ListObjectsV1Handler)
+	// PutBucketPolicy
+	bucket.Methods("PUT").HandlerFunc(api.PutBucketPolicyHandler).Queries("policy", "")
+	// PutBucketNotification
+	bucket.Methods("PUT").HandlerFunc(api.PutBucketNotificationHandler).Queries("notification", "")
+	// PutBucket
+	bucket.Methods("PUT").HandlerFunc(api.PutBucketHandler)
+	// HeadBucket
+	bucket.Methods("HEAD").HandlerFunc(api.HeadBucketHandler)
+	// PostPolicy
+	bucket.Methods("POST").HeadersRegexp("Content-Type", "multipart/form-data*").HandlerFunc(api.PostPolicyBucketHandler)
+	// DeleteMultipleObjects
+	bucket.Methods("POST").HandlerFunc(api.DeleteMultipleObjectsHandler)
+	// DeleteBucketPolicy
+	bucket.Methods("DELETE").HandlerFunc(api.DeleteBucketPolicyHandler).Queries("policy", "")
+	// DeleteBucket
+	bucket.Methods("DELETE").HandlerFunc(api.DeleteBucketHandler)
+
+	/// Root operation
+
+	// ListBuckets
+	apiRouter.Methods("GET").HandlerFunc(api.ListBucketsHandler)
+}

cmd/gateway-startup-msg.go

@@ -0,0 +1,67 @@
+/*
+ * Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+
+	"github.com/minio/mc/pkg/console"
+)
+
+// Prints the formatted startup message.
+func printGatewayStartupMessage(apiEndPoints []string, accessKey, secretKey, backendType string) {
+	// Prints credential.
+	printGatewayCommonMsg(apiEndPoints, accessKey, secretKey)
+
+	// Prints `mc` cli configuration message chooses
+	// first endpoint as default.
+	endPoint := apiEndPoints[0]
+
+	// Configure 'mc', following block prints platform specific information for minio client.
+	console.Println(colorBlue("\nCommand-line Access: ") + mcQuickStartGuide)
+	if runtime.GOOS == globalWindowsOSName {
+		mcMessage := fmt.Sprintf("$ mc.exe config host add my%s %s %s %s", backendType, endPoint, accessKey, secretKey)
+		console.Println(fmt.Sprintf(getFormatStr(len(mcMessage), 3), mcMessage))
+	} else {
+		mcMessage := fmt.Sprintf("$ mc config host add my%s %s %s %s", backendType, endPoint, accessKey, secretKey)
+		console.Println(fmt.Sprintf(getFormatStr(len(mcMessage), 3), mcMessage))
+	}
+
+	// Prints documentation message.
+	printObjectAPIMsg()
+
+	// SSL is configured reads certification chain, prints
+	// authority and expiry.
+	if globalIsSSL {
+		certs, err := readCertificateChain()
+		if err != nil {
+			console.Fatalf("Unable to read certificate chain. Error: %s", err)
+		}
+		printCertificateMsg(certs)
+	}
+}
+
+// Prints common server startup message. Prints credential, region and browser access.
+func printGatewayCommonMsg(apiEndpoints []string, accessKey, secretKey string) {
+	apiEndpointStr := strings.Join(apiEndpoints, "  ")
+	// Colorize the message and print.
+	console.Println(colorBlue("\nEndpoint: ") + colorBold(fmt.Sprintf(getFormatStr(len(apiEndpointStr), 1), apiEndpointStr)))
+	console.Println(colorBlue("AccessKey: ") + colorBold(fmt.Sprintf("%s ", accessKey)))
+	console.Println(colorBlue("SecretKey: ") + colorBold(fmt.Sprintf("%s ", secretKey)))
+}

cmd/gateway-startup-msg_test.go

@@ -0,0 +1,31 @@
+/*
+ * Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import "testing"
+
+// Test printing Gateway common message.
+func TestPrintGatewayCommonMessage(t *testing.T) {
+	apiEndpoints := []string{"127.0.0.1:9000"}
+	printGatewayCommonMsg(apiEndpoints, "abcd1", "abcd123")
+}
+
+// Test print gateway startup message.
+func TestPrintGatewayStartupMessage(t *testing.T) {
+	apiEndpoints := []string{"127.0.0.1:9000"}
+	printGatewayStartupMessage(apiEndpoints, "abcd1", "abcd123", "azure")
+}

cmd/globals.go

@@ -36,6 +36,10 @@ const (
 	globalWindowsOSName            = "windows"
 	globalNetBSDOSName             = "netbsd"
 	globalSolarisOSName            = "solaris"
+	globalMinioModeFS              = "mode-server-fs"
+	globalMinioModeXL              = "mode-server-xl"
+	globalMinioModeDistXL          = "mode-server-distributed-xl"
+	globalMinioModeGatewayAzure    = "mode-gateway-azure"
 	// Add new global values here.
 )
 

cmd/main.go

@@ -98,6 +98,7 @@ func newApp() *cli.App {
 	registerCommand(serverCmd)
 	registerCommand(versionCmd)
 	registerCommand(updateCmd)
+	registerCommand(gatewayCmd)
 
 	// Set up app.
 	cli.HelpFlag = cli.BoolFlag{

cmd/server-main.go

@@ -48,10 +48,10 @@ var serverCmd = cli.Command{
 	Flags:  append(serverFlags, globalFlags...),
 	Action: serverMain,
 	CustomHelpTemplate: `NAME:
- {{.HelpName}} - {{.Usage}}
+  {{.HelpName}} - {{.Usage}}
 
 USAGE:
- {{.HelpName}} {{if .VisibleFlags}}[FLAGS] {{end}}PATH [PATH...]
+  {{.HelpName}} {{if .VisibleFlags}}[FLAGS] {{end}}PATH [PATH...]
 {{if .VisibleFlags}}
 FLAGS:
   {{range .VisibleFlags}}{{.}}
@@ -85,9 +85,9 @@ EXAMPLES:
 }
 
 // Check for updates and print a notification message
-func checkUpdate() {
+func checkUpdate(mode string) {
 	// Its OK to ignore any errors during getUpdateInfo() here.
-	if older, downloadURL, err := getUpdateInfo(1 * time.Second); err == nil {
+	if older, downloadURL, err := getUpdateInfo(1*time.Second, mode); err == nil {
 		if older > time.Duration(0) {
 			console.Println(colorizeUpdateMessage(downloadURL, older))
 		}
@@ -485,11 +485,6 @@ func serverMain(c *cli.Context) {
 	// Initializes server config, certs, logging and system settings.
 	initServerConfig(c)
 
-	// Check for new updates from dl.minio.io.
-	if !quietFlag {
-		checkUpdate()
-	}
-
 	// Server address.
 	serverAddr := c.String("address")
 
@@ -538,6 +533,18 @@ func serverMain(c *cli.Context) {
 		globalIsXL = true
 	}
 
+	if !quietFlag {
+		// Check for new updates from dl.minio.io.
+		mode := globalMinioModeFS
+		if globalIsXL {
+			mode = globalMinioModeXL
+		}
+		if globalIsDistXL {
+			mode = globalMinioModeDistXL
+		}
+		checkUpdate(mode)
+	}
+
 	// Initialize name space lock.
 	initNSLock(globalIsDistXL)
 

cmd/server-startup-msg.go

@@ -1,5 +1,5 @@
 /*
- * Minio Cloud Storage, (C) 2016, 2017, 2017 Minio, Inc.
+ * Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -175,4 +175,5 @@ func getCertificateChainMsg(certs []*x509.Certificate) string {
 // Prints the certificate expiry message.
 func printCertificateMsg(certs []*x509.Certificate) {
 	console.Println(getCertificateChainMsg(certs))
+
 }

cmd/update-main.go

@@ -133,8 +133,11 @@ func IsSourceBuild() bool {
 //   Minio (<OS>; <ARCH>[; docker][; source])  Minio/<VERSION> Minio/<RELEASE-TAG> Minio/<COMMIT-ID>
 //
 // For any change here should be discussed by openning an issue at https://github.com/minio/minio/issues.
-func getUserAgent() string {
+func getUserAgent(mode string) string {
 	userAgent := "Minio (" + runtime.GOOS + "; " + runtime.GOARCH
+	if mode != "" {
+		userAgent += "; " + mode
+	}
 	if IsDocker() {
 		userAgent += "; docker"
 	}
@@ -146,12 +149,12 @@ func getUserAgent() string {
 	return userAgent
 }
 
-func downloadReleaseData(releaseChecksumURL string, timeout time.Duration) (data string, err error) {
+func downloadReleaseData(releaseChecksumURL string, timeout time.Duration, mode string) (data string, err error) {
 	req, err := http.NewRequest("GET", releaseChecksumURL, nil)
 	if err != nil {
 		return data, err
 	}
-	req.Header.Set("User-Agent", getUserAgent())
+	req.Header.Set("User-Agent", getUserAgent(mode))
 
 	client := &http.Client{
 		Timeout: timeout,
@@ -184,8 +187,8 @@ func downloadReleaseData(releaseChecksumURL string, timeout time.Duration) (data
 }
 
 // DownloadReleaseData - downloads release data from minio official server.
-func DownloadReleaseData(timeout time.Duration) (data string, err error) {
-	return downloadReleaseData(minioReleaseURL+"minio.shasum", timeout)
+func DownloadReleaseData(timeout time.Duration, mode string) (data string, err error) {
+	return downloadReleaseData(minioReleaseURL+"minio.shasum", timeout, mode)
 }
 
 func parseReleaseData(data string) (releaseTime time.Time, err error) {
@@ -214,8 +217,8 @@ func parseReleaseData(data string) (releaseTime time.Time, err error) {
 	return releaseTime, err
 }
 
-func getLatestReleaseTime(timeout time.Duration) (releaseTime time.Time, err error) {
-	data, err := DownloadReleaseData(timeout)
+func getLatestReleaseTime(timeout time.Duration, mode string) (releaseTime time.Time, err error) {
+	data, err := DownloadReleaseData(timeout, mode)
 	if err != nil {
 		return releaseTime, err
 	}
@@ -235,13 +238,13 @@ func getDownloadURL() (downloadURL string) {
 	return minioReleaseURL + "minio"
 }
 
-func getUpdateInfo(timeout time.Duration) (older time.Duration, downloadURL string, err error) {
+func getUpdateInfo(timeout time.Duration, mode string) (older time.Duration, downloadURL string, err error) {
 	currentReleaseTime, err := GetCurrentReleaseTime()
 	if err != nil {
 		return older, downloadURL, err
 	}
 
-	latestReleaseTime, err := getLatestReleaseTime(timeout)
+	latestReleaseTime, err := getLatestReleaseTime(timeout, mode)
 	if err != nil {
 		return older, downloadURL, err
 	}
@@ -266,7 +269,8 @@ func mainUpdate(ctx *cli.Context) {
 		}
 	}
 
-	older, downloadURL, err := getUpdateInfo(10 * time.Second)
+	minioMode := ""
+	older, downloadURL, err := getUpdateInfo(10*time.Second, minioMode)
 	if err != nil {
 		quietPrintln(err)
 		os.Exit(-1)

cmd/update-main_test.go

@@ -260,7 +260,7 @@ func TestDownloadReleaseData(t *testing.T) {
 	}
 
 	for _, testCase := range testCases {
-		result, err := downloadReleaseData(testCase.releaseChecksumURL, 1*time.Second)
+		result, err := downloadReleaseData(testCase.releaseChecksumURL, 1*time.Second, "")
 		if testCase.expectedErr == nil {
 			if err != nil {
 				t.Fatalf("error: expected: %v, got: %v", testCase.expectedErr, err)

cmd/web-handlers.go

@@ -708,8 +708,8 @@ type ListAllBucketPoliciesArgs struct {
 	BucketName string `json:"bucketName"`
 }
 
-// Collection of canned bucket policy at a given prefix.
-type bucketAccessPolicy struct {
+// BucketAccessPolicy - Collection of canned bucket policy at a given prefix.
+type BucketAccessPolicy struct {
 	Prefix string              `json:"prefix"`
 	Policy policy.BucketPolicy `json:"policy"`
 }
@@ -717,7 +717,7 @@ type bucketAccessPolicy struct {
 // ListAllBucketPoliciesRep - get all bucket policy reply.
 type ListAllBucketPoliciesRep struct {
 	UIVersion string               `json:"uiVersion"`
-	Policies  []bucketAccessPolicy `json:"policies"`
+	Policies  []BucketAccessPolicy `json:"policies"`
 }
 
 // GetllBucketPolicy - get all bucket policy.
@@ -738,7 +738,7 @@ func (web *webAPIHandlers) ListAllBucketPolicies(r *http.Request, args *ListAllB
 
 	reply.UIVersion = browser.UIVersion
 	for prefix, policy := range policy.GetPolicies(policyInfo.Statements, args.BucketName) {
-		reply.Policies = append(reply.Policies, bucketAccessPolicy{
+		reply.Policies = append(reply.Policies, BucketAccessPolicy{
 			Prefix: prefix,
 			Policy: policy,
 		})

cmd/web-handlers_test.go

@@ -1136,13 +1136,13 @@ func testWebListAllBucketPoliciesHandler(obj ObjectLayer, instanceType string, t
 		t.Fatal("Unexpected error: ", err)
 	}
 
-	testCaseResult1 := []bucketAccessPolicy{{
+	testCaseResult1 := []BucketAccessPolicy{{
 		Prefix: bucketName + "/hello*",
 		Policy: policy.BucketPolicyReadWrite,
 	}}
 	testCases := []struct {
 		bucketName     string
-		expectedResult []bucketAccessPolicy
+		expectedResult []BucketAccessPolicy
 	}{
 		{bucketName, testCaseResult1},
 	}

docs/gateway/README.md

@@ -0,0 +1,48 @@
+# Minio Gateway [![Slack](https://slack.minio.io/slack?type=svg)](https://slack.minio.io)
+
+Minio gateway adds Amazon S3 compatibility to third party cloud storage providers. Supported providers are:
+
+- Azure Blob Storage
+
+## Run Minio Gateway for Azure Blob Storage
+
+### Using Docker
+
+```
+docker run -p 9000:9000 --name azure-s3 \
+ -e "MINIO_ACCESS_KEY=azureaccountname" \
+ -e "MINIO_SECRET_KEY=azureaccountkey" \
+ minio/minio gateway azure
+```
+
+### Using Binary
+
+```
+export MINIO_ACCESS_KEY=azureaccountname
+export MINIO_SECRET_KEY=azureaccountkey
+minio gateway azure
+```
+
+## Test using Minio Client `mc`
+`mc` provides a modern alternative to UNIX commands such as ls, cat, cp, mirror, diff etc. It supports filesystems and Amazon S3 compatible cloud storage services.
+
+### Configure `mc`
+
+```
+mc config host add myazure http://gateway-ip:9000 azureaccountname azureaccountkey
+```
+
+### List containers on Azure
+
+```
+mc ls myazure
+[2017-02-22 01:50:43 PST]     0B ferenginar/
+[2017-02-26 21:43:51 PST]     0B my-container/
+[2017-02-26 22:10:11 PST]     0B test-container1/
+```
+
+## Explore Further
+- [`mc` command-line interface](https://docs.minio.io/docs/minio-client-quickstart-guide)
+- [`aws` command-line interface](https://docs.minio.io/docs/aws-cli-with-minio)
+- [`minfs` filesystem interface](http://docs.minio.io/docs/minfs-quickstart-guide)
+- [`minio-go` Go SDK](https://docs.minio.io/docs/golang-client-quickstart-guide)

docs/gateway/azure-limitations.md

@@ -0,0 +1,19 @@
+## Minio Azure Gateway Limitations
+
+Gateway inherits the following Azure limitations:
+
+- Maximum Multipart part size is 100MB.
+- Maximum Multipart object size is 10000*100 MB = 1TB
+- No support for prefix based bucket policies. Only top level bucket policy is supported.
+- Gateway restart implies all the ongoing multipart uploads must be restarted.
+  i.e clients must again start with NewMultipartUpload
+  This is because S3 clients send metadata in NewMultipartUpload but Azure expects metadata to
+  be set during CompleteMultipartUpload (PutBlockList in Azure terminology). We store the metadata
+  sent by the client during NewMultipartUpload in memory so that it can be set on Azure later during
+  CompleteMultipartUpload. When the gateway is restarted this information is lost.
+- Bucket names with "." in the bucket name is not supported.
+- Non-empty buckets get removed on a DeleteBucket() call.
+
+Other limitations:
+- Current implementation of ListMultipartUploads is incomplete. Right now it returns if the object with name "prefix" has any uploaded parts.
+- Bucket notification not supported.

vendor/github.com/Azure/azure-sdk-for-go/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2016 Microsoft Corporation
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/Azure/azure-sdk-for-go/storage/README.md

@@ -0,0 +1,5 @@
+# Azure Storage SDK for Go
+
+The `github.com/Azure/azure-sdk-for-go/storage` package is used to perform operations in Azure Storage Service. To manage your storage accounts (Azure Resource Manager / ARM), use the [github.com/Azure/azure-sdk-for-go/arm/storage](../arm/storage) package. For your classic storage accounts (Azure Service Management / ASM), use [github.com/Azure/azure-sdk-for-go/management/storageservice](../management/storageservice) package.
+
+This package includes support for [Azure Storage Emulator](https://azure.microsoft.com/documentation/articles/storage-use-emulator/)

vendor/github.com/Azure/azure-sdk-for-go/storage/authorization.go

@@ -0,0 +1,223 @@
+// Package storage provides clients for Microsoft Azure Storage Services.
+package storage
+
+import (
+	"bytes"
+	"fmt"
+	"net/url"
+	"sort"
+	"strings"
+)
+
+// See: https://docs.microsoft.com/rest/api/storageservices/fileservices/authentication-for-the-azure-storage-services
+
+type authentication string
+
+const (
+	sharedKey             authentication = "sharedKey"
+	sharedKeyForTable     authentication = "sharedKeyTable"
+	sharedKeyLite         authentication = "sharedKeyLite"
+	sharedKeyLiteForTable authentication = "sharedKeyLiteTable"
+
+	// headers
+	headerAuthorization     = "Authorization"
+	headerContentLength     = "Content-Length"
+	headerDate              = "Date"
+	headerXmsDate           = "x-ms-date"
+	headerXmsVersion        = "x-ms-version"
+	headerContentEncoding   = "Content-Encoding"
+	headerContentLanguage   = "Content-Language"
+	headerContentType       = "Content-Type"
+	headerContentMD5        = "Content-MD5"
+	headerIfModifiedSince   = "If-Modified-Since"
+	headerIfMatch           = "If-Match"
+	headerIfNoneMatch       = "If-None-Match"
+	headerIfUnmodifiedSince = "If-Unmodified-Since"
+	headerRange             = "Range"
+)
+
+func (c *Client) addAuthorizationHeader(verb, url string, headers map[string]string, auth authentication) (map[string]string, error) {
+	authHeader, err := c.getSharedKey(verb, url, headers, auth)
+	if err != nil {
+		return nil, err
+	}
+	headers[headerAuthorization] = authHeader
+	return headers, nil
+}
+
+func (c *Client) getSharedKey(verb, url string, headers map[string]string, auth authentication) (string, error) {
+	canRes, err := c.buildCanonicalizedResource(url, auth)
+	if err != nil {
+		return "", err
+	}
+
+	canString, err := buildCanonicalizedString(verb, headers, canRes, auth)
+	if err != nil {
+		return "", err
+	}
+	return c.createAuthorizationHeader(canString, auth), nil
+}
+
+func (c *Client) buildCanonicalizedResource(uri string, auth authentication) (string, error) {
+	errMsg := "buildCanonicalizedResource error: %s"
+	u, err := url.Parse(uri)
+	if err != nil {
+		return "", fmt.Errorf(errMsg, err.Error())
+	}
+
+	cr := bytes.NewBufferString("/")
+	cr.WriteString(c.getCanonicalizedAccountName())
+
+	if len(u.Path) > 0 {
+		// Any portion of the CanonicalizedResource string that is derived from
+		// the resource's URI should be encoded exactly as it is in the URI.
+		// -- https://msdn.microsoft.com/en-gb/library/azure/dd179428.aspx
+		cr.WriteString(u.EscapedPath())
+	}
+
+	params, err := url.ParseQuery(u.RawQuery)
+	if err != nil {
+		return "", fmt.Errorf(errMsg, err.Error())
+	}
+
+	// See https://github.com/Azure/azure-storage-net/blob/master/Lib/Common/Core/Util/AuthenticationUtility.cs#L277
+	if auth == sharedKey {
+		if len(params) > 0 {
+			cr.WriteString("\n")
+
+			keys := []string{}
+			for key := range params {
+				keys = append(keys, key)
+			}
+			sort.Strings(keys)
+
+			completeParams := []string{}
+			for _, key := range keys {
+				if len(params[key]) > 1 {
+					sort.Strings(params[key])
+				}
+
+				completeParams = append(completeParams, fmt.Sprintf("%s:%s", key, strings.Join(params[key], ",")))
+			}
+			cr.WriteString(strings.Join(completeParams, "\n"))
+		}
+	} else {
+		// search for "comp" parameter, if exists then add it to canonicalizedresource
+		if v, ok := params["comp"]; ok {
+			cr.WriteString("?comp=" + v[0])
+		}
+	}
+
+	return string(cr.Bytes()), nil
+}
+
+func (c *Client) getCanonicalizedAccountName() string {
+	// since we may be trying to access a secondary storage account, we need to
+	// remove the -secondary part of the storage name
+	return strings.TrimSuffix(c.accountName, "-secondary")
+}
+
+func buildCanonicalizedString(verb string, headers map[string]string, canonicalizedResource string, auth authentication) (string, error) {
+	contentLength := headers[headerContentLength]
+	if contentLength == "0" {
+		contentLength = ""
+	}
+	date := headers[headerDate]
+	if v, ok := headers[headerXmsDate]; ok {
+		if auth == sharedKey || auth == sharedKeyLite {
+			date = ""
+		} else {
+			date = v
+		}
+	}
+	var canString string
+	switch auth {
+	case sharedKey:
+		canString = strings.Join([]string{
+			verb,
+			headers[headerContentEncoding],
+			headers[headerContentLanguage],
+			contentLength,
+			headers[headerContentMD5],
+			headers[headerContentType],
+			date,
+			headers[headerIfModifiedSince],
+			headers[headerIfMatch],
+			headers[headerIfNoneMatch],
+			headers[headerIfUnmodifiedSince],
+			headers[headerRange],
+			buildCanonicalizedHeader(headers),
+			canonicalizedResource,
+		}, "\n")
+	case sharedKeyForTable:
+		canString = strings.Join([]string{
+			verb,
+			headers[headerContentMD5],
+			headers[headerContentType],
+			date,
+			canonicalizedResource,
+		}, "\n")
+	case sharedKeyLite:
+		canString = strings.Join([]string{
+			verb,
+			headers[headerContentMD5],
+			headers[headerContentType],
+			date,
+			buildCanonicalizedHeader(headers),
+			canonicalizedResource,
+		}, "\n")
+	case sharedKeyLiteForTable:
+		canString = strings.Join([]string{
+			date,
+			canonicalizedResource,
+		}, "\n")
+	default:
+		return "", fmt.Errorf("%s authentication is not supported yet", auth)
+	}
+	return canString, nil
+}
+
+func buildCanonicalizedHeader(headers map[string]string) string {
+	cm := make(map[string]string)
+
+	for k, v := range headers {
+		headerName := strings.TrimSpace(strings.ToLower(k))
+		if strings.HasPrefix(headerName, "x-ms-") {
+			cm[headerName] = v
+		}
+	}
+
+	if len(cm) == 0 {
+		return ""
+	}
+
+	keys := []string{}
+	for key := range cm {
+		keys = append(keys, key)
+	}
+
+	sort.Strings(keys)
+
+	ch := bytes.NewBufferString("")
+
+	for _, key := range keys {
+		ch.WriteString(key)
+		ch.WriteRune(':')
+		ch.WriteString(cm[key])
+		ch.WriteRune('\n')
+	}
+
+	return strings.TrimSuffix(string(ch.Bytes()), "\n")
+}
+
+func (c *Client) createAuthorizationHeader(canonicalizedString string, auth authentication) string {
+	signature := c.computeHmac256(canonicalizedString)
+	var key string
+	switch auth {
+	case sharedKey, sharedKeyForTable:
+		key = "SharedKey"
+	case sharedKeyLite, sharedKeyLiteForTable:
+		key = "SharedKeyLite"
+	}
+	return fmt.Sprintf("%s %s:%s", key, c.getCanonicalizedAccountName(), signature)
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/client.go

@@ -0,0 +1,469 @@
+// Package storage provides clients for Microsoft Azure Storage Services.
+package storage
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+const (
+	// DefaultBaseURL is the domain name used for storage requests when a
+	// default client is created.
+	DefaultBaseURL = "core.windows.net"
+
+	// DefaultAPIVersion is the  Azure Storage API version string used when a
+	// basic client is created.
+	DefaultAPIVersion = "2015-02-21"
+
+	defaultUseHTTPS = true
+
+	// StorageEmulatorAccountName is the fixed storage account used by Azure Storage Emulator
+	StorageEmulatorAccountName = "devstoreaccount1"
+
+	// StorageEmulatorAccountKey is the the fixed storage account used by Azure Storage Emulator
+	StorageEmulatorAccountKey = "Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw=="
+
+	blobServiceName  = "blob"
+	tableServiceName = "table"
+	queueServiceName = "queue"
+	fileServiceName  = "file"
+
+	storageEmulatorBlob  = "127.0.0.1:10000"
+	storageEmulatorTable = "127.0.0.1:10002"
+	storageEmulatorQueue = "127.0.0.1:10001"
+
+	userAgentHeader = "User-Agent"
+)
+
+// Client is the object that needs to be constructed to perform
+// operations on the storage account.
+type Client struct {
+	// HTTPClient is the http.Client used to initiate API
+	// requests.  If it is nil, http.DefaultClient is used.
+	HTTPClient *http.Client
+
+	accountName      string
+	accountKey       []byte
+	useHTTPS         bool
+	UseSharedKeyLite bool
+	baseURL          string
+	apiVersion       string
+	userAgent        string
+}
+
+type storageResponse struct {
+	statusCode int
+	headers    http.Header
+	body       io.ReadCloser
+}
+
+type odataResponse struct {
+	storageResponse
+	odata odataErrorMessage
+}
+
+// AzureStorageServiceError contains fields of the error response from
+// Azure Storage Service REST API. See https://msdn.microsoft.com/en-us/library/azure/dd179382.aspx
+// Some fields might be specific to certain calls.
+type AzureStorageServiceError struct {
+	Code                      string `xml:"Code"`
+	Message                   string `xml:"Message"`
+	AuthenticationErrorDetail string `xml:"AuthenticationErrorDetail"`
+	QueryParameterName        string `xml:"QueryParameterName"`
+	QueryParameterValue       string `xml:"QueryParameterValue"`
+	Reason                    string `xml:"Reason"`
+	StatusCode                int
+	RequestID                 string
+}
+
+type odataErrorMessageMessage struct {
+	Lang  string `json:"lang"`
+	Value string `json:"value"`
+}
+
+type odataErrorMessageInternal struct {
+	Code    string                   `json:"code"`
+	Message odataErrorMessageMessage `json:"message"`
+}
+
+type odataErrorMessage struct {
+	Err odataErrorMessageInternal `json:"odata.error"`
+}
+
+// UnexpectedStatusCodeError is returned when a storage service responds with neither an error
+// nor with an HTTP status code indicating success.
+type UnexpectedStatusCodeError struct {
+	allowed []int
+	got     int
+}
+
+func (e UnexpectedStatusCodeError) Error() string {
+	s := func(i int) string { return fmt.Sprintf("%d %s", i, http.StatusText(i)) }
+
+	got := s(e.got)
+	expected := []string{}
+	for _, v := range e.allowed {
+		expected = append(expected, s(v))
+	}
+	return fmt.Sprintf("storage: status code from service response is %s; was expecting %s", got, strings.Join(expected, " or "))
+}
+
+// Got is the actual status code returned by Azure.
+func (e UnexpectedStatusCodeError) Got() int {
+	return e.got
+}
+
+// NewBasicClient constructs a Client with given storage service name and
+// key.
+func NewBasicClient(accountName, accountKey string) (Client, error) {
+	if accountName == StorageEmulatorAccountName {
+		return NewEmulatorClient()
+	}
+	return NewClient(accountName, accountKey, DefaultBaseURL, DefaultAPIVersion, defaultUseHTTPS)
+
+}
+
+//NewEmulatorClient contructs a Client intended to only work with Azure
+//Storage Emulator
+func NewEmulatorClient() (Client, error) {
+	return NewClient(StorageEmulatorAccountName, StorageEmulatorAccountKey, DefaultBaseURL, DefaultAPIVersion, false)
+}
+
+// NewClient constructs a Client. This should be used if the caller wants
+// to specify whether to use HTTPS, a specific REST API version or a custom
+// storage endpoint than Azure Public Cloud.
+func NewClient(accountName, accountKey, blobServiceBaseURL, apiVersion string, useHTTPS bool) (Client, error) {
+	var c Client
+	if accountName == "" {
+		return c, fmt.Errorf("azure: account name required")
+	} else if accountKey == "" {
+		return c, fmt.Errorf("azure: account key required")
+	} else if blobServiceBaseURL == "" {
+		return c, fmt.Errorf("azure: base storage service url required")
+	}
+
+	key, err := base64.StdEncoding.DecodeString(accountKey)
+	if err != nil {
+		return c, fmt.Errorf("azure: malformed storage account key: %v", err)
+	}
+
+	c = Client{
+		accountName:      accountName,
+		accountKey:       key,
+		useHTTPS:         useHTTPS,
+		baseURL:          blobServiceBaseURL,
+		apiVersion:       apiVersion,
+		UseSharedKeyLite: false,
+	}
+	c.userAgent = c.getDefaultUserAgent()
+	return c, nil
+}
+
+func (c Client) getDefaultUserAgent() string {
+	return fmt.Sprintf("Go/%s (%s-%s) Azure-SDK-For-Go/%s storage-dataplane/%s",
+		runtime.Version(),
+		runtime.GOARCH,
+		runtime.GOOS,
+		sdkVersion,
+		c.apiVersion,
+	)
+}
+
+// AddToUserAgent adds an extension to the current user agent
+func (c *Client) AddToUserAgent(extension string) error {
+	if extension != "" {
+		c.userAgent = fmt.Sprintf("%s %s", c.userAgent, extension)
+		return nil
+	}
+	return fmt.Errorf("Extension was empty, User Agent stayed as %s", c.userAgent)
+}
+
+// protectUserAgent is used in funcs that include extraheaders as a parameter.
+// It prevents the User-Agent header to be overwritten, instead if it happens to
+// be present, it gets added to the current User-Agent. Use it before getStandardHeaders
+func (c *Client) protectUserAgent(extraheaders map[string]string) map[string]string {
+	if v, ok := extraheaders[userAgentHeader]; ok {
+		c.AddToUserAgent(v)
+		delete(extraheaders, userAgentHeader)
+	}
+	return extraheaders
+}
+
+func (c Client) getBaseURL(service string) string {
+	scheme := "http"
+	if c.useHTTPS {
+		scheme = "https"
+	}
+	host := ""
+	if c.accountName == StorageEmulatorAccountName {
+		switch service {
+		case blobServiceName:
+			host = storageEmulatorBlob
+		case tableServiceName:
+			host = storageEmulatorTable
+		case queueServiceName:
+			host = storageEmulatorQueue
+		}
+	} else {
+		host = fmt.Sprintf("%s.%s.%s", c.accountName, service, c.baseURL)
+	}
+
+	u := &url.URL{
+		Scheme: scheme,
+		Host:   host}
+	return u.String()
+}
+
+func (c Client) getEndpoint(service, path string, params url.Values) string {
+	u, err := url.Parse(c.getBaseURL(service))
+	if err != nil {
+		// really should not be happening
+		panic(err)
+	}
+
+	// API doesn't accept path segments not starting with '/'
+	if !strings.HasPrefix(path, "/") {
+		path = fmt.Sprintf("/%v", path)
+	}
+
+	if c.accountName == StorageEmulatorAccountName {
+		path = fmt.Sprintf("/%v%v", StorageEmulatorAccountName, path)
+	}
+
+	u.Path = path
+	u.RawQuery = params.Encode()
+	return u.String()
+}
+
+// GetBlobService returns a BlobStorageClient which can operate on the blob
+// service of the storage account.
+func (c Client) GetBlobService() BlobStorageClient {
+	b := BlobStorageClient{
+		client: c,
+	}
+	b.client.AddToUserAgent(blobServiceName)
+	b.auth = sharedKey
+	if c.UseSharedKeyLite {
+		b.auth = sharedKeyLite
+	}
+	return b
+}
+
+// GetQueueService returns a QueueServiceClient which can operate on the queue
+// service of the storage account.
+func (c Client) GetQueueService() QueueServiceClient {
+	q := QueueServiceClient{
+		client: c,
+	}
+	q.client.AddToUserAgent(queueServiceName)
+	q.auth = sharedKey
+	if c.UseSharedKeyLite {
+		q.auth = sharedKeyLite
+	}
+	return q
+}
+
+// GetTableService returns a TableServiceClient which can operate on the table
+// service of the storage account.
+func (c Client) GetTableService() TableServiceClient {
+	t := TableServiceClient{
+		client: c,
+	}
+	t.client.AddToUserAgent(tableServiceName)
+	t.auth = sharedKeyForTable
+	if c.UseSharedKeyLite {
+		t.auth = sharedKeyLiteForTable
+	}
+	return t
+}
+
+// GetFileService returns a FileServiceClient which can operate on the file
+// service of the storage account.
+func (c Client) GetFileService() FileServiceClient {
+	f := FileServiceClient{
+		client: c,
+	}
+	f.client.AddToUserAgent(fileServiceName)
+	f.auth = sharedKey
+	if c.UseSharedKeyLite {
+		f.auth = sharedKeyLite
+	}
+	return f
+}
+
+func (c Client) getStandardHeaders() map[string]string {
+	return map[string]string{
+		userAgentHeader: c.userAgent,
+		"x-ms-version":  c.apiVersion,
+		"x-ms-date":     currentTimeRfc1123Formatted(),
+	}
+}
+
+func (c Client) exec(verb, url string, headers map[string]string, body io.Reader, auth authentication) (*storageResponse, error) {
+	headers, err := c.addAuthorizationHeader(verb, url, headers, auth)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest(verb, url, body)
+	if err != nil {
+		return nil, errors.New("azure/storage: error creating request: " + err.Error())
+	}
+
+	if clstr, ok := headers["Content-Length"]; ok {
+		// content length header is being signed, but completely ignored by golang.
+		// instead we have to use the ContentLength property on the request struct
+		// (see https://golang.org/src/net/http/request.go?s=18140:18370#L536 and
+		// https://golang.org/src/net/http/transfer.go?s=1739:2467#L49)
+		req.ContentLength, err = strconv.ParseInt(clstr, 10, 64)
+		if err != nil {
+			return nil, err
+		}
+	}
+	for k, v := range headers {
+		req.Header.Add(k, v)
+	}
+
+	httpClient := c.HTTPClient
+	if httpClient == nil {
+		httpClient = http.DefaultClient
+	}
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	statusCode := resp.StatusCode
+	if statusCode >= 400 && statusCode <= 505 {
+		var respBody []byte
+		respBody, err = readResponseBody(resp)
+		if err != nil {
+			return nil, err
+		}
+
+		requestID := resp.Header.Get("x-ms-request-id")
+		if len(respBody) == 0 {
+			// no error in response body, might happen in HEAD requests
+			err = serviceErrFromStatusCode(resp.StatusCode, resp.Status, requestID)
+		} else {
+			// response contains storage service error object, unmarshal
+			storageErr, errIn := serviceErrFromXML(respBody, resp.StatusCode, requestID)
+			if err != nil { // error unmarshaling the error response
+				err = errIn
+			}
+			err = storageErr
+		}
+		return &storageResponse{
+			statusCode: resp.StatusCode,
+			headers:    resp.Header,
+			body:       ioutil.NopCloser(bytes.NewReader(respBody)), /* restore the body */
+		}, err
+	}
+
+	return &storageResponse{
+		statusCode: resp.StatusCode,
+		headers:    resp.Header,
+		body:       resp.Body}, nil
+}
+
+func (c Client) execInternalJSON(verb, url string, headers map[string]string, body io.Reader, auth authentication) (*odataResponse, error) {
+	headers, err := c.addAuthorizationHeader(verb, url, headers, auth)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest(verb, url, body)
+	for k, v := range headers {
+		req.Header.Add(k, v)
+	}
+
+	httpClient := c.HTTPClient
+	if httpClient == nil {
+		httpClient = http.DefaultClient
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	respToRet := &odataResponse{}
+	respToRet.body = resp.Body
+	respToRet.statusCode = resp.StatusCode
+	respToRet.headers = resp.Header
+
+	statusCode := resp.StatusCode
+	if statusCode >= 400 && statusCode <= 505 {
+		var respBody []byte
+		respBody, err = readResponseBody(resp)
+		if err != nil {
+			return nil, err
+		}
+
+		if len(respBody) == 0 {
+			// no error in response body, might happen in HEAD requests
+			err = serviceErrFromStatusCode(resp.StatusCode, resp.Status, resp.Header.Get("x-ms-request-id"))
+			return respToRet, err
+		}
+		// try unmarshal as odata.error json
+		err = json.Unmarshal(respBody, &respToRet.odata)
+		return respToRet, err
+	}
+
+	return respToRet, nil
+}
+
+func readResponseBody(resp *http.Response) ([]byte, error) {
+	defer resp.Body.Close()
+	out, err := ioutil.ReadAll(resp.Body)
+	if err == io.EOF {
+		err = nil
+	}
+	return out, err
+}
+
+func serviceErrFromXML(body []byte, statusCode int, requestID string) (AzureStorageServiceError, error) {
+	var storageErr AzureStorageServiceError
+	if err := xml.Unmarshal(body, &storageErr); err != nil {
+		return storageErr, err
+	}
+	storageErr.StatusCode = statusCode
+	storageErr.RequestID = requestID
+	return storageErr, nil
+}
+
+func serviceErrFromStatusCode(code int, status string, requestID string) AzureStorageServiceError {
+	return AzureStorageServiceError{
+		StatusCode: code,
+		Code:       status,
+		RequestID:  requestID,
+		Message:    "no response body was available for error status code",
+	}
+}
+
+func (e AzureStorageServiceError) Error() string {
+	return fmt.Sprintf("storage: service returned error: StatusCode=%d, ErrorCode=%s, ErrorMessage=%s, RequestId=%s, QueryParameterName=%s, QueryParameterValue=%s",
+		e.StatusCode, e.Code, e.Message, e.RequestID, e.QueryParameterName, e.QueryParameterValue)
+}
+
+// checkRespCode returns UnexpectedStatusError if the given response code is not
+// one of the allowed status codes; otherwise nil.
+func checkRespCode(respCode int, allowed []int) error {
+	for _, v := range allowed {
+		if respCode == v {
+			return nil
+		}
+	}
+	return UnexpectedStatusCodeError{allowed, respCode}
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/directory.go

@@ -0,0 +1,217 @@
+package storage
+
+import (
+	"encoding/xml"
+	"net/http"
+	"net/url"
+)
+
+// Directory represents a directory on a share.
+type Directory struct {
+	fsc        *FileServiceClient
+	Metadata   map[string]string
+	Name       string `xml:"Name"`
+	parent     *Directory
+	Properties DirectoryProperties
+	share      *Share
+}
+
+// DirectoryProperties contains various properties of a directory.
+type DirectoryProperties struct {
+	LastModified string `xml:"Last-Modified"`
+	Etag         string `xml:"Etag"`
+}
+
+// ListDirsAndFilesParameters defines the set of customizable parameters to
+// make a List Files and Directories call.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166980.aspx
+type ListDirsAndFilesParameters struct {
+	Marker     string
+	MaxResults uint
+	Timeout    uint
+}
+
+// DirsAndFilesListResponse contains the response fields from
+// a List Files and Directories call.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166980.aspx
+type DirsAndFilesListResponse struct {
+	XMLName     xml.Name    `xml:"EnumerationResults"`
+	Xmlns       string      `xml:"xmlns,attr"`
+	Marker      string      `xml:"Marker"`
+	MaxResults  int64       `xml:"MaxResults"`
+	Directories []Directory `xml:"Entries>Directory"`
+	Files       []File      `xml:"Entries>File"`
+	NextMarker  string      `xml:"NextMarker"`
+}
+
+// builds the complete directory path for this directory object.
+func (d *Directory) buildPath() string {
+	path := ""
+	current := d
+	for current.Name != "" {
+		path = "/" + current.Name + path
+		current = current.parent
+	}
+	return d.share.buildPath() + path
+}
+
+// Create this directory in the associated share.
+// If a directory with the same name already exists, the operation fails.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166993.aspx
+func (d *Directory) Create() error {
+	// if this is the root directory exit early
+	if d.parent == nil {
+		return nil
+	}
+
+	headers, err := d.fsc.createResource(d.buildPath(), resourceDirectory, mergeMDIntoExtraHeaders(d.Metadata, nil))
+	if err != nil {
+		return err
+	}
+
+	d.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// CreateIfNotExists creates this directory under the associated share if the
+// directory does not exists. Returns true if the directory is newly created or
+// false if the directory already exists.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166993.aspx
+func (d *Directory) CreateIfNotExists() (bool, error) {
+	// if this is the root directory exit early
+	if d.parent == nil {
+		return false, nil
+	}
+
+	resp, err := d.fsc.createResourceNoClose(d.buildPath(), resourceDirectory, nil)
+	if resp != nil {
+		defer resp.body.Close()
+		if resp.statusCode == http.StatusCreated || resp.statusCode == http.StatusConflict {
+			if resp.statusCode == http.StatusCreated {
+				d.updateEtagAndLastModified(resp.headers)
+				return true, nil
+			}
+
+			return false, d.FetchAttributes()
+		}
+	}
+
+	return false, err
+}
+
+// Delete removes this directory.  It must be empty in order to be deleted.
+// If the directory does not exist the operation fails.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166969.aspx
+func (d *Directory) Delete() error {
+	return d.fsc.deleteResource(d.buildPath(), resourceDirectory)
+}
+
+// DeleteIfExists removes this directory if it exists.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166969.aspx
+func (d *Directory) DeleteIfExists() (bool, error) {
+	resp, err := d.fsc.deleteResourceNoClose(d.buildPath(), resourceDirectory)
+	if resp != nil {
+		defer resp.body.Close()
+		if resp.statusCode == http.StatusAccepted || resp.statusCode == http.StatusNotFound {
+			return resp.statusCode == http.StatusAccepted, nil
+		}
+	}
+	return false, err
+}
+
+// Exists returns true if this directory exists.
+func (d *Directory) Exists() (bool, error) {
+	exists, headers, err := d.fsc.resourceExists(d.buildPath(), resourceDirectory)
+	if exists {
+		d.updateEtagAndLastModified(headers)
+	}
+	return exists, err
+}
+
+// FetchAttributes retrieves metadata for this directory.
+func (d *Directory) FetchAttributes() error {
+	headers, err := d.fsc.getResourceHeaders(d.buildPath(), compNone, resourceDirectory, http.MethodHead)
+	if err != nil {
+		return err
+	}
+
+	d.updateEtagAndLastModified(headers)
+	d.Metadata = getMetadataFromHeaders(headers)
+
+	return nil
+}
+
+// GetDirectoryReference returns a child Directory object for this directory.
+func (d *Directory) GetDirectoryReference(name string) *Directory {
+	return &Directory{
+		fsc:    d.fsc,
+		Name:   name,
+		parent: d,
+		share:  d.share,
+	}
+}
+
+// GetFileReference returns a child File object for this directory.
+func (d *Directory) GetFileReference(name string) *File {
+	return &File{
+		fsc:    d.fsc,
+		Name:   name,
+		parent: d,
+		share:  d.share,
+	}
+}
+
+// ListDirsAndFiles returns a list of files and directories under this directory.
+// It also contains a pagination token and other response details.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166980.aspx
+func (d *Directory) ListDirsAndFiles(params ListDirsAndFilesParameters) (*DirsAndFilesListResponse, error) {
+	q := mergeParams(params.getParameters(), getURLInitValues(compList, resourceDirectory))
+
+	resp, err := d.fsc.listContent(d.buildPath(), q, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.body.Close()
+	var out DirsAndFilesListResponse
+	err = xmlUnmarshal(resp.body, &out)
+	return &out, err
+}
+
+// SetMetadata replaces the metadata for this directory.
+//
+// Some keys may be converted to Camel-Case before sending. All keys
+// are returned in lower case by GetDirectoryMetadata. HTTP header names
+// are case-insensitive so case munging should not matter to other
+// applications either.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/mt427370.aspx
+func (d *Directory) SetMetadata() error {
+	headers, err := d.fsc.setResourceHeaders(d.buildPath(), compMetadata, resourceDirectory, mergeMDIntoExtraHeaders(d.Metadata, nil))
+	if err != nil {
+		return err
+	}
+
+	d.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// updates Etag and last modified date
+func (d *Directory) updateEtagAndLastModified(headers http.Header) {
+	d.Properties.Etag = headers.Get("Etag")
+	d.Properties.LastModified = headers.Get("Last-Modified")
+}
+
+// URL gets the canonical URL to this directory.
+// This method does not create a publicly accessible URL if the directory
+// is private and this method does not check if the directory exists.
+func (d *Directory) URL() string {
+	return d.fsc.client.getEndpoint(fileServiceName, d.buildPath(), url.Values{})
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/file.go

@@ -0,0 +1,360 @@
+package storage
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+)
+
+const fourMB = uint64(4194304)
+const oneTB = uint64(1099511627776)
+
+// File represents a file on a share.
+type File struct {
+	fsc        *FileServiceClient
+	Metadata   map[string]string
+	Name       string `xml:"Name"`
+	parent     *Directory
+	Properties FileProperties `xml:"Properties"`
+	share      *Share
+}
+
+// FileProperties contains various properties of a file.
+type FileProperties struct {
+	CacheControl string `header:"x-ms-cache-control"`
+	Disposition  string `header:"x-ms-content-disposition"`
+	Encoding     string `header:"x-ms-content-encoding"`
+	Etag         string
+	Language     string `header:"x-ms-content-language"`
+	LastModified string
+	Length       uint64 `xml:"Content-Length"`
+	MD5          string `header:"x-ms-content-md5"`
+	Type         string `header:"x-ms-content-type"`
+}
+
+// FileCopyState contains various properties of a file copy operation.
+type FileCopyState struct {
+	CompletionTime string
+	ID             string
+	Progress       string
+	Source         string
+	Status         string
+	StatusDesc     string
+}
+
+// FileStream contains file data returned from a call to GetFile.
+type FileStream struct {
+	Body       io.ReadCloser
+	ContentMD5 string
+}
+
+// FileRanges contains a list of file range information for a file.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166984.aspx
+type FileRanges struct {
+	ContentLength uint64
+	LastModified  string
+	ETag          string
+	FileRanges    []FileRange `xml:"Range"`
+}
+
+// FileRange contains range information for a file.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166984.aspx
+type FileRange struct {
+	Start uint64 `xml:"Start"`
+	End   uint64 `xml:"End"`
+}
+
+func (fr FileRange) String() string {
+	return fmt.Sprintf("bytes=%d-%d", fr.Start, fr.End)
+}
+
+// builds the complete file path for this file object
+func (f *File) buildPath() string {
+	return f.parent.buildPath() + "/" + f.Name
+}
+
+// ClearRange releases the specified range of space in a file.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn194276.aspx
+func (f *File) ClearRange(fileRange FileRange) error {
+	headers, err := f.modifyRange(nil, fileRange, nil)
+	if err != nil {
+		return err
+	}
+
+	f.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// Create creates a new file or replaces an existing one.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn194271.aspx
+func (f *File) Create(maxSize uint64) error {
+	if maxSize > oneTB {
+		return fmt.Errorf("max file size is 1TB")
+	}
+
+	extraHeaders := map[string]string{
+		"x-ms-content-length": strconv.FormatUint(maxSize, 10),
+		"x-ms-type":           "file",
+	}
+
+	headers, err := f.fsc.createResource(f.buildPath(), resourceFile, mergeMDIntoExtraHeaders(f.Metadata, extraHeaders))
+	if err != nil {
+		return err
+	}
+
+	f.Properties.Length = maxSize
+	f.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// Delete immediately removes this file from the storage account.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn689085.aspx
+func (f *File) Delete() error {
+	return f.fsc.deleteResource(f.buildPath(), resourceFile)
+}
+
+// DeleteIfExists removes this file if it exists.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn689085.aspx
+func (f *File) DeleteIfExists() (bool, error) {
+	resp, err := f.fsc.deleteResourceNoClose(f.buildPath(), resourceFile)
+	if resp != nil {
+		defer resp.body.Close()
+		if resp.statusCode == http.StatusAccepted || resp.statusCode == http.StatusNotFound {
+			return resp.statusCode == http.StatusAccepted, nil
+		}
+	}
+	return false, err
+}
+
+// DownloadRangeToStream operation downloads the specified range of this file with optional MD5 hash.
+//
+// See https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/get-file
+func (f *File) DownloadRangeToStream(fileRange FileRange, getContentMD5 bool) (fs FileStream, err error) {
+	if getContentMD5 && isRangeTooBig(fileRange) {
+		return fs, fmt.Errorf("must specify a range less than or equal to 4MB when getContentMD5 is true")
+	}
+
+	extraHeaders := map[string]string{
+		"Range": fileRange.String(),
+	}
+	if getContentMD5 == true {
+		extraHeaders["x-ms-range-get-content-md5"] = "true"
+	}
+
+	resp, err := f.fsc.getResourceNoClose(f.buildPath(), compNone, resourceFile, http.MethodGet, extraHeaders)
+	if err != nil {
+		return fs, err
+	}
+
+	if err = checkRespCode(resp.statusCode, []int{http.StatusOK, http.StatusPartialContent}); err != nil {
+		resp.body.Close()
+		return fs, err
+	}
+
+	fs.Body = resp.body
+	if getContentMD5 {
+		fs.ContentMD5 = resp.headers.Get("Content-MD5")
+	}
+	return fs, nil
+}
+
+// Exists returns true if this file exists.
+func (f *File) Exists() (bool, error) {
+	exists, headers, err := f.fsc.resourceExists(f.buildPath(), resourceFile)
+	if exists {
+		f.updateEtagAndLastModified(headers)
+		f.updateProperties(headers)
+	}
+	return exists, err
+}
+
+// FetchAttributes updates metadata and properties for this file.
+func (f *File) FetchAttributes() error {
+	headers, err := f.fsc.getResourceHeaders(f.buildPath(), compNone, resourceFile, http.MethodHead)
+	if err != nil {
+		return err
+	}
+
+	f.updateEtagAndLastModified(headers)
+	f.updateProperties(headers)
+	f.Metadata = getMetadataFromHeaders(headers)
+	return nil
+}
+
+// returns true if the range is larger than 4MB
+func isRangeTooBig(fileRange FileRange) bool {
+	if fileRange.End-fileRange.Start > fourMB {
+		return true
+	}
+
+	return false
+}
+
+// ListRanges returns the list of valid ranges for this file.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166984.aspx
+func (f *File) ListRanges(listRange *FileRange) (*FileRanges, error) {
+	params := url.Values{"comp": {"rangelist"}}
+
+	// add optional range to list
+	var headers map[string]string
+	if listRange != nil {
+		headers = make(map[string]string)
+		headers["Range"] = listRange.String()
+	}
+
+	resp, err := f.fsc.listContent(f.buildPath(), params, headers)
+	if err != nil {
+		return nil, err
+	}
+
+	defer resp.body.Close()
+	var cl uint64
+	cl, err = strconv.ParseUint(resp.headers.Get("x-ms-content-length"), 10, 64)
+	if err != nil {
+		return nil, err
+	}
+
+	var out FileRanges
+	out.ContentLength = cl
+	out.ETag = resp.headers.Get("ETag")
+	out.LastModified = resp.headers.Get("Last-Modified")
+
+	err = xmlUnmarshal(resp.body, &out)
+	return &out, err
+}
+
+// modifies a range of bytes in this file
+func (f *File) modifyRange(bytes io.Reader, fileRange FileRange, contentMD5 *string) (http.Header, error) {
+	if err := f.fsc.checkForStorageEmulator(); err != nil {
+		return nil, err
+	}
+	if fileRange.End < fileRange.Start {
+		return nil, errors.New("the value for rangeEnd must be greater than or equal to rangeStart")
+	}
+	if bytes != nil && isRangeTooBig(fileRange) {
+		return nil, errors.New("range cannot exceed 4MB in size")
+	}
+
+	uri := f.fsc.client.getEndpoint(fileServiceName, f.buildPath(), url.Values{"comp": {"range"}})
+
+	// default to clear
+	write := "clear"
+	cl := uint64(0)
+
+	// if bytes is not nil then this is an update operation
+	if bytes != nil {
+		write = "update"
+		cl = (fileRange.End - fileRange.Start) + 1
+	}
+
+	extraHeaders := map[string]string{
+		"Content-Length": strconv.FormatUint(cl, 10),
+		"Range":          fileRange.String(),
+		"x-ms-write":     write,
+	}
+
+	if contentMD5 != nil {
+		extraHeaders["Content-MD5"] = *contentMD5
+	}
+
+	headers := mergeHeaders(f.fsc.client.getStandardHeaders(), extraHeaders)
+	resp, err := f.fsc.client.exec(http.MethodPut, uri, headers, bytes, f.fsc.auth)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.body.Close()
+	return resp.headers, checkRespCode(resp.statusCode, []int{http.StatusCreated})
+}
+
+// SetMetadata replaces the metadata for this file.
+//
+// Some keys may be converted to Camel-Case before sending. All keys
+// are returned in lower case by GetFileMetadata. HTTP header names
+// are case-insensitive so case munging should not matter to other
+// applications either.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn689097.aspx
+func (f *File) SetMetadata() error {
+	headers, err := f.fsc.setResourceHeaders(f.buildPath(), compMetadata, resourceFile, mergeMDIntoExtraHeaders(f.Metadata, nil))
+	if err != nil {
+		return err
+	}
+
+	f.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// SetProperties sets system properties on this file.
+//
+// Some keys may be converted to Camel-Case before sending. All keys
+// are returned in lower case by SetFileProperties. HTTP header names
+// are case-insensitive so case munging should not matter to other
+// applications either.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn166975.aspx
+func (f *File) SetProperties() error {
+	headers, err := f.fsc.setResourceHeaders(f.buildPath(), compProperties, resourceFile, headersFromStruct(f.Properties))
+	if err != nil {
+		return err
+	}
+
+	f.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// updates Etag and last modified date
+func (f *File) updateEtagAndLastModified(headers http.Header) {
+	f.Properties.Etag = headers.Get("Etag")
+	f.Properties.LastModified = headers.Get("Last-Modified")
+}
+
+// updates file properties from the specified HTTP header
+func (f *File) updateProperties(header http.Header) {
+	size, err := strconv.ParseUint(header.Get("Content-Length"), 10, 64)
+	if err == nil {
+		f.Properties.Length = size
+	}
+
+	f.updateEtagAndLastModified(header)
+	f.Properties.CacheControl = header.Get("Cache-Control")
+	f.Properties.Disposition = header.Get("Content-Disposition")
+	f.Properties.Encoding = header.Get("Content-Encoding")
+	f.Properties.Language = header.Get("Content-Language")
+	f.Properties.MD5 = header.Get("Content-MD5")
+	f.Properties.Type = header.Get("Content-Type")
+}
+
+// URL gets the canonical URL to this file.
+// This method does not create a publicly accessible URL if the file
+// is private and this method does not check if the file exists.
+func (f *File) URL() string {
+	return f.fsc.client.getEndpoint(fileServiceName, f.buildPath(), url.Values{})
+}
+
+// WriteRange writes a range of bytes to this file with an optional MD5 hash of the content.
+// Note that the length of bytes must match (rangeEnd - rangeStart) + 1 with a maximum size of 4MB.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn194276.aspx
+func (f *File) WriteRange(bytes io.Reader, fileRange FileRange, contentMD5 *string) error {
+	if bytes == nil {
+		return errors.New("bytes cannot be nil")
+	}
+
+	headers, err := f.modifyRange(bytes, fileRange, contentMD5)
+	if err != nil {
+		return err
+	}
+
+	f.updateEtagAndLastModified(headers)
+	return nil
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/fileserviceclient.go

@@ -0,0 +1,360 @@
+package storage
+
+import (
+	"encoding/xml"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+// FileServiceClient contains operations for Microsoft Azure File Service.
+type FileServiceClient struct {
+	client Client
+	auth   authentication
+}
+
+// ListSharesParameters defines the set of customizable parameters to make a
+// List Shares call.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn167009.aspx
+type ListSharesParameters struct {
+	Prefix     string
+	Marker     string
+	Include    string
+	MaxResults uint
+	Timeout    uint
+}
+
+// ShareListResponse contains the response fields from
+// ListShares call.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn167009.aspx
+type ShareListResponse struct {
+	XMLName    xml.Name `xml:"EnumerationResults"`
+	Xmlns      string   `xml:"xmlns,attr"`
+	Prefix     string   `xml:"Prefix"`
+	Marker     string   `xml:"Marker"`
+	NextMarker string   `xml:"NextMarker"`
+	MaxResults int64    `xml:"MaxResults"`
+	Shares     []Share  `xml:"Shares>Share"`
+}
+
+type compType string
+
+const (
+	compNone       compType = ""
+	compList       compType = "list"
+	compMetadata   compType = "metadata"
+	compProperties compType = "properties"
+	compRangeList  compType = "rangelist"
+)
+
+func (ct compType) String() string {
+	return string(ct)
+}
+
+type resourceType string
+
+const (
+	resourceDirectory resourceType = "directory"
+	resourceFile      resourceType = ""
+	resourceShare     resourceType = "share"
+)
+
+func (rt resourceType) String() string {
+	return string(rt)
+}
+
+func (p ListSharesParameters) getParameters() url.Values {
+	out := url.Values{}
+
+	if p.Prefix != "" {
+		out.Set("prefix", p.Prefix)
+	}
+	if p.Marker != "" {
+		out.Set("marker", p.Marker)
+	}
+	if p.Include != "" {
+		out.Set("include", p.Include)
+	}
+	if p.MaxResults != 0 {
+		out.Set("maxresults", fmt.Sprintf("%v", p.MaxResults))
+	}
+	if p.Timeout != 0 {
+		out.Set("timeout", fmt.Sprintf("%v", p.Timeout))
+	}
+
+	return out
+}
+
+func (p ListDirsAndFilesParameters) getParameters() url.Values {
+	out := url.Values{}
+
+	if p.Marker != "" {
+		out.Set("marker", p.Marker)
+	}
+	if p.MaxResults != 0 {
+		out.Set("maxresults", fmt.Sprintf("%v", p.MaxResults))
+	}
+	if p.Timeout != 0 {
+		out.Set("timeout", fmt.Sprintf("%v", p.Timeout))
+	}
+
+	return out
+}
+
+// returns url.Values for the specified types
+func getURLInitValues(comp compType, res resourceType) url.Values {
+	values := url.Values{}
+	if comp != compNone {
+		values.Set("comp", comp.String())
+	}
+	if res != resourceFile {
+		values.Set("restype", res.String())
+	}
+	return values
+}
+
+// GetShareReference returns a Share object for the specified share name.
+func (f FileServiceClient) GetShareReference(name string) Share {
+	return Share{
+		fsc:  &f,
+		Name: name,
+		Properties: ShareProperties{
+			Quota: -1,
+		},
+	}
+}
+
+// ListShares returns the list of shares in a storage account along with
+// pagination token and other response details.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179352.aspx
+func (f FileServiceClient) ListShares(params ListSharesParameters) (*ShareListResponse, error) {
+	q := mergeParams(params.getParameters(), url.Values{"comp": {"list"}})
+
+	var out ShareListResponse
+	resp, err := f.listContent("", q, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.body.Close()
+	err = xmlUnmarshal(resp.body, &out)
+
+	// assign our client to the newly created Share objects
+	for i := range out.Shares {
+		out.Shares[i].fsc = &f
+	}
+	return &out, err
+}
+
+// retrieves directory or share content
+func (f FileServiceClient) listContent(path string, params url.Values, extraHeaders map[string]string) (*storageResponse, error) {
+	if err := f.checkForStorageEmulator(); err != nil {
+		return nil, err
+	}
+
+	uri := f.client.getEndpoint(fileServiceName, path, params)
+	extraHeaders = f.client.protectUserAgent(extraHeaders)
+	headers := mergeHeaders(f.client.getStandardHeaders(), extraHeaders)
+
+	resp, err := f.client.exec(http.MethodGet, uri, headers, nil, f.auth)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
+		resp.body.Close()
+		return nil, err
+	}
+
+	return resp, nil
+}
+
+// returns true if the specified resource exists
+func (f FileServiceClient) resourceExists(path string, res resourceType) (bool, http.Header, error) {
+	if err := f.checkForStorageEmulator(); err != nil {
+		return false, nil, err
+	}
+
+	uri := f.client.getEndpoint(fileServiceName, path, getURLInitValues(compNone, res))
+	headers := f.client.getStandardHeaders()
+
+	resp, err := f.client.exec(http.MethodHead, uri, headers, nil, f.auth)
+	if resp != nil {
+		defer resp.body.Close()
+		if resp.statusCode == http.StatusOK || resp.statusCode == http.StatusNotFound {
+			return resp.statusCode == http.StatusOK, resp.headers, nil
+		}
+	}
+	return false, nil, err
+}
+
+// creates a resource depending on the specified resource type
+func (f FileServiceClient) createResource(path string, res resourceType, extraHeaders map[string]string) (http.Header, error) {
+	resp, err := f.createResourceNoClose(path, res, extraHeaders)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.body.Close()
+	return resp.headers, checkRespCode(resp.statusCode, []int{http.StatusCreated})
+}
+
+// creates a resource depending on the specified resource type, doesn't close the response body
+func (f FileServiceClient) createResourceNoClose(path string, res resourceType, extraHeaders map[string]string) (*storageResponse, error) {
+	if err := f.checkForStorageEmulator(); err != nil {
+		return nil, err
+	}
+
+	values := getURLInitValues(compNone, res)
+	uri := f.client.getEndpoint(fileServiceName, path, values)
+	extraHeaders = f.client.protectUserAgent(extraHeaders)
+	headers := mergeHeaders(f.client.getStandardHeaders(), extraHeaders)
+
+	return f.client.exec(http.MethodPut, uri, headers, nil, f.auth)
+}
+
+// returns HTTP header data for the specified directory or share
+func (f FileServiceClient) getResourceHeaders(path string, comp compType, res resourceType, verb string) (http.Header, error) {
+	resp, err := f.getResourceNoClose(path, comp, res, verb, nil)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.body.Close()
+
+	if err = checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
+		return nil, err
+	}
+
+	return resp.headers, nil
+}
+
+// gets the specified resource, doesn't close the response body
+func (f FileServiceClient) getResourceNoClose(path string, comp compType, res resourceType, verb string, extraHeaders map[string]string) (*storageResponse, error) {
+	if err := f.checkForStorageEmulator(); err != nil {
+		return nil, err
+	}
+
+	params := getURLInitValues(comp, res)
+	uri := f.client.getEndpoint(fileServiceName, path, params)
+	extraHeaders = f.client.protectUserAgent(extraHeaders)
+	headers := mergeHeaders(f.client.getStandardHeaders(), extraHeaders)
+
+	return f.client.exec(verb, uri, headers, nil, f.auth)
+}
+
+// deletes the resource and returns the response
+func (f FileServiceClient) deleteResource(path string, res resourceType) error {
+	resp, err := f.deleteResourceNoClose(path, res)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+	return checkRespCode(resp.statusCode, []int{http.StatusAccepted})
+}
+
+// deletes the resource and returns the response, doesn't close the response body
+func (f FileServiceClient) deleteResourceNoClose(path string, res resourceType) (*storageResponse, error) {
+	if err := f.checkForStorageEmulator(); err != nil {
+		return nil, err
+	}
+
+	values := getURLInitValues(compNone, res)
+	uri := f.client.getEndpoint(fileServiceName, path, values)
+	return f.client.exec(http.MethodDelete, uri, f.client.getStandardHeaders(), nil, f.auth)
+}
+
+// merges metadata into extraHeaders and returns extraHeaders
+func mergeMDIntoExtraHeaders(metadata, extraHeaders map[string]string) map[string]string {
+	if metadata == nil && extraHeaders == nil {
+		return nil
+	}
+	if extraHeaders == nil {
+		extraHeaders = make(map[string]string)
+	}
+	for k, v := range metadata {
+		extraHeaders[userDefinedMetadataHeaderPrefix+k] = v
+	}
+	return extraHeaders
+}
+
+// merges extraHeaders into headers and returns headers
+func mergeHeaders(headers, extraHeaders map[string]string) map[string]string {
+	for k, v := range extraHeaders {
+		headers[k] = v
+	}
+	return headers
+}
+
+// sets extra header data for the specified resource
+func (f FileServiceClient) setResourceHeaders(path string, comp compType, res resourceType, extraHeaders map[string]string) (http.Header, error) {
+	if err := f.checkForStorageEmulator(); err != nil {
+		return nil, err
+	}
+
+	params := getURLInitValues(comp, res)
+	uri := f.client.getEndpoint(fileServiceName, path, params)
+	extraHeaders = f.client.protectUserAgent(extraHeaders)
+	headers := mergeHeaders(f.client.getStandardHeaders(), extraHeaders)
+
+	resp, err := f.client.exec(http.MethodPut, uri, headers, nil, f.auth)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.body.Close()
+
+	return resp.headers, checkRespCode(resp.statusCode, []int{http.StatusOK})
+}
+
+// gets metadata for the specified resource
+func (f FileServiceClient) getMetadata(path string, res resourceType) (map[string]string, error) {
+	if err := f.checkForStorageEmulator(); err != nil {
+		return nil, err
+	}
+
+	headers, err := f.getResourceHeaders(path, compMetadata, res, http.MethodGet)
+	if err != nil {
+		return nil, err
+	}
+
+	return getMetadataFromHeaders(headers), nil
+}
+
+// returns a map of custom metadata values from the specified HTTP header
+func getMetadataFromHeaders(header http.Header) map[string]string {
+	metadata := make(map[string]string)
+	for k, v := range header {
+		// Can't trust CanonicalHeaderKey() to munge case
+		// reliably. "_" is allowed in identifiers:
+		// https://msdn.microsoft.com/en-us/library/azure/dd179414.aspx
+		// https://msdn.microsoft.com/library/aa664670(VS.71).aspx
+		// http://tools.ietf.org/html/rfc7230#section-3.2
+		// ...but "_" is considered invalid by
+		// CanonicalMIMEHeaderKey in
+		// https://golang.org/src/net/textproto/reader.go?s=14615:14659#L542
+		// so k can be "X-Ms-Meta-Foo" or "x-ms-meta-foo_bar".
+		k = strings.ToLower(k)
+		if len(v) == 0 || !strings.HasPrefix(k, strings.ToLower(userDefinedMetadataHeaderPrefix)) {
+			continue
+		}
+		// metadata["foo"] = content of the last X-Ms-Meta-Foo header
+		k = k[len(userDefinedMetadataHeaderPrefix):]
+		metadata[k] = v[len(v)-1]
+	}
+
+	if len(metadata) == 0 {
+		return nil
+	}
+
+	return metadata
+}
+
+//checkForStorageEmulator determines if the client is setup for use with
+//Azure Storage Emulator, and returns a relevant error
+func (f FileServiceClient) checkForStorageEmulator() error {
+	if f.client.accountName == StorageEmulatorAccountName {
+		return fmt.Errorf("Error: File service is not currently supported by Azure Storage Emulator")
+	}
+	return nil
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/queue.go

@@ -0,0 +1,346 @@
+package storage
+
+import (
+	"encoding/xml"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+)
+
+const (
+	// casing is per Golang's http.Header canonicalizing the header names.
+	approximateMessagesCountHeader  = "X-Ms-Approximate-Messages-Count"
+	userDefinedMetadataHeaderPrefix = "X-Ms-Meta-"
+)
+
+// QueueServiceClient contains operations for Microsoft Azure Queue Storage
+// Service.
+type QueueServiceClient struct {
+	client Client
+	auth   authentication
+}
+
+func pathForQueue(queue string) string         { return fmt.Sprintf("/%s", queue) }
+func pathForQueueMessages(queue string) string { return fmt.Sprintf("/%s/messages", queue) }
+func pathForMessage(queue, name string) string { return fmt.Sprintf("/%s/messages/%s", queue, name) }
+
+type putMessageRequest struct {
+	XMLName     xml.Name `xml:"QueueMessage"`
+	MessageText string   `xml:"MessageText"`
+}
+
+// PutMessageParameters is the set of options can be specified for Put Messsage
+// operation. A zero struct does not use any preferences for the request.
+type PutMessageParameters struct {
+	VisibilityTimeout int
+	MessageTTL        int
+}
+
+func (p PutMessageParameters) getParameters() url.Values {
+	out := url.Values{}
+	if p.VisibilityTimeout != 0 {
+		out.Set("visibilitytimeout", strconv.Itoa(p.VisibilityTimeout))
+	}
+	if p.MessageTTL != 0 {
+		out.Set("messagettl", strconv.Itoa(p.MessageTTL))
+	}
+	return out
+}
+
+// GetMessagesParameters is the set of options can be specified for Get
+// Messsages operation. A zero struct does not use any preferences for the
+// request.
+type GetMessagesParameters struct {
+	NumOfMessages     int
+	VisibilityTimeout int
+}
+
+func (p GetMessagesParameters) getParameters() url.Values {
+	out := url.Values{}
+	if p.NumOfMessages != 0 {
+		out.Set("numofmessages", strconv.Itoa(p.NumOfMessages))
+	}
+	if p.VisibilityTimeout != 0 {
+		out.Set("visibilitytimeout", strconv.Itoa(p.VisibilityTimeout))
+	}
+	return out
+}
+
+// PeekMessagesParameters is the set of options can be specified for Peek
+// Messsage operation. A zero struct does not use any preferences for the
+// request.
+type PeekMessagesParameters struct {
+	NumOfMessages int
+}
+
+func (p PeekMessagesParameters) getParameters() url.Values {
+	out := url.Values{"peekonly": {"true"}} // Required for peek operation
+	if p.NumOfMessages != 0 {
+		out.Set("numofmessages", strconv.Itoa(p.NumOfMessages))
+	}
+	return out
+}
+
+// UpdateMessageParameters is the set of options can be specified for Update Messsage
+// operation. A zero struct does not use any preferences for the request.
+type UpdateMessageParameters struct {
+	PopReceipt        string
+	VisibilityTimeout int
+}
+
+func (p UpdateMessageParameters) getParameters() url.Values {
+	out := url.Values{}
+	if p.PopReceipt != "" {
+		out.Set("popreceipt", p.PopReceipt)
+	}
+	if p.VisibilityTimeout != 0 {
+		out.Set("visibilitytimeout", strconv.Itoa(p.VisibilityTimeout))
+	}
+	return out
+}
+
+// GetMessagesResponse represents a response returned from Get Messages
+// operation.
+type GetMessagesResponse struct {
+	XMLName           xml.Name             `xml:"QueueMessagesList"`
+	QueueMessagesList []GetMessageResponse `xml:"QueueMessage"`
+}
+
+// GetMessageResponse represents a QueueMessage object returned from Get
+// Messages operation response.
+type GetMessageResponse struct {
+	MessageID       string `xml:"MessageId"`
+	InsertionTime   string `xml:"InsertionTime"`
+	ExpirationTime  string `xml:"ExpirationTime"`
+	PopReceipt      string `xml:"PopReceipt"`
+	TimeNextVisible string `xml:"TimeNextVisible"`
+	DequeueCount    int    `xml:"DequeueCount"`
+	MessageText     string `xml:"MessageText"`
+}
+
+// PeekMessagesResponse represents a response returned from Get Messages
+// operation.
+type PeekMessagesResponse struct {
+	XMLName           xml.Name              `xml:"QueueMessagesList"`
+	QueueMessagesList []PeekMessageResponse `xml:"QueueMessage"`
+}
+
+// PeekMessageResponse represents a QueueMessage object returned from Peek
+// Messages operation response.
+type PeekMessageResponse struct {
+	MessageID      string `xml:"MessageId"`
+	InsertionTime  string `xml:"InsertionTime"`
+	ExpirationTime string `xml:"ExpirationTime"`
+	DequeueCount   int    `xml:"DequeueCount"`
+	MessageText    string `xml:"MessageText"`
+}
+
+// QueueMetadataResponse represents user defined metadata and queue
+// properties on a specific queue.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179384.aspx
+type QueueMetadataResponse struct {
+	ApproximateMessageCount int
+	UserDefinedMetadata     map[string]string
+}
+
+// SetMetadata operation sets user-defined metadata on the specified queue.
+// Metadata is associated with the queue as name-value pairs.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179348.aspx
+func (c QueueServiceClient) SetMetadata(name string, metadata map[string]string) error {
+	uri := c.client.getEndpoint(queueServiceName, pathForQueue(name), url.Values{"comp": []string{"metadata"}})
+	metadata = c.client.protectUserAgent(metadata)
+	headers := c.client.getStandardHeaders()
+	for k, v := range metadata {
+		headers[userDefinedMetadataHeaderPrefix+k] = v
+	}
+
+	resp, err := c.client.exec(http.MethodPut, uri, headers, nil, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+
+	return checkRespCode(resp.statusCode, []int{http.StatusNoContent})
+}
+
+// GetMetadata operation retrieves user-defined metadata and queue
+// properties on the specified queue. Metadata is associated with
+// the queue as name-values pairs.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179384.aspx
+//
+// Because the way Golang's http client (and http.Header in particular)
+// canonicalize header names, the returned metadata names would always
+// be all lower case.
+func (c QueueServiceClient) GetMetadata(name string) (QueueMetadataResponse, error) {
+	qm := QueueMetadataResponse{}
+	qm.UserDefinedMetadata = make(map[string]string)
+	uri := c.client.getEndpoint(queueServiceName, pathForQueue(name), url.Values{"comp": []string{"metadata"}})
+	headers := c.client.getStandardHeaders()
+	resp, err := c.client.exec(http.MethodGet, uri, headers, nil, c.auth)
+	if err != nil {
+		return qm, err
+	}
+	defer resp.body.Close()
+
+	for k, v := range resp.headers {
+		if len(v) != 1 {
+			return qm, fmt.Errorf("Unexpected number of values (%d) in response header '%s'", len(v), k)
+		}
+
+		value := v[0]
+
+		if k == approximateMessagesCountHeader {
+			qm.ApproximateMessageCount, err = strconv.Atoi(value)
+			if err != nil {
+				return qm, fmt.Errorf("Unexpected value in response header '%s': '%s' ", k, value)
+			}
+		} else if strings.HasPrefix(k, userDefinedMetadataHeaderPrefix) {
+			name := strings.TrimPrefix(k, userDefinedMetadataHeaderPrefix)
+			qm.UserDefinedMetadata[strings.ToLower(name)] = value
+		}
+	}
+
+	return qm, checkRespCode(resp.statusCode, []int{http.StatusOK})
+}
+
+// CreateQueue operation creates a queue under the given account.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179342.aspx
+func (c QueueServiceClient) CreateQueue(name string) error {
+	uri := c.client.getEndpoint(queueServiceName, pathForQueue(name), url.Values{})
+	headers := c.client.getStandardHeaders()
+	resp, err := c.client.exec(http.MethodPut, uri, headers, nil, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+	return checkRespCode(resp.statusCode, []int{http.StatusCreated})
+}
+
+// DeleteQueue operation permanently deletes the specified queue.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179436.aspx
+func (c QueueServiceClient) DeleteQueue(name string) error {
+	uri := c.client.getEndpoint(queueServiceName, pathForQueue(name), url.Values{})
+	resp, err := c.client.exec(http.MethodDelete, uri, c.client.getStandardHeaders(), nil, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+	return checkRespCode(resp.statusCode, []int{http.StatusNoContent})
+}
+
+// QueueExists returns true if a queue with given name exists.
+func (c QueueServiceClient) QueueExists(name string) (bool, error) {
+	uri := c.client.getEndpoint(queueServiceName, pathForQueue(name), url.Values{"comp": {"metadata"}})
+	resp, err := c.client.exec(http.MethodGet, uri, c.client.getStandardHeaders(), nil, c.auth)
+	if resp != nil && (resp.statusCode == http.StatusOK || resp.statusCode == http.StatusNotFound) {
+		return resp.statusCode == http.StatusOK, nil
+	}
+
+	return false, err
+}
+
+// PutMessage operation adds a new message to the back of the message queue.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179346.aspx
+func (c QueueServiceClient) PutMessage(queue string, message string, params PutMessageParameters) error {
+	uri := c.client.getEndpoint(queueServiceName, pathForQueueMessages(queue), params.getParameters())
+	req := putMessageRequest{MessageText: message}
+	body, nn, err := xmlMarshal(req)
+	if err != nil {
+		return err
+	}
+	headers := c.client.getStandardHeaders()
+	headers["Content-Length"] = strconv.Itoa(nn)
+	resp, err := c.client.exec(http.MethodPost, uri, headers, body, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+	return checkRespCode(resp.statusCode, []int{http.StatusCreated})
+}
+
+// ClearMessages operation deletes all messages from the specified queue.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179454.aspx
+func (c QueueServiceClient) ClearMessages(queue string) error {
+	uri := c.client.getEndpoint(queueServiceName, pathForQueueMessages(queue), url.Values{})
+	resp, err := c.client.exec(http.MethodDelete, uri, c.client.getStandardHeaders(), nil, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+	return checkRespCode(resp.statusCode, []int{http.StatusNoContent})
+}
+
+// GetMessages operation retrieves one or more messages from the front of the
+// queue.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179474.aspx
+func (c QueueServiceClient) GetMessages(queue string, params GetMessagesParameters) (GetMessagesResponse, error) {
+	var r GetMessagesResponse
+	uri := c.client.getEndpoint(queueServiceName, pathForQueueMessages(queue), params.getParameters())
+	resp, err := c.client.exec(http.MethodGet, uri, c.client.getStandardHeaders(), nil, c.auth)
+	if err != nil {
+		return r, err
+	}
+	defer resp.body.Close()
+	err = xmlUnmarshal(resp.body, &r)
+	return r, err
+}
+
+// PeekMessages retrieves one or more messages from the front of the queue, but
+// does not alter the visibility of the message.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179472.aspx
+func (c QueueServiceClient) PeekMessages(queue string, params PeekMessagesParameters) (PeekMessagesResponse, error) {
+	var r PeekMessagesResponse
+	uri := c.client.getEndpoint(queueServiceName, pathForQueueMessages(queue), params.getParameters())
+	resp, err := c.client.exec(http.MethodGet, uri, c.client.getStandardHeaders(), nil, c.auth)
+	if err != nil {
+		return r, err
+	}
+	defer resp.body.Close()
+	err = xmlUnmarshal(resp.body, &r)
+	return r, err
+}
+
+// DeleteMessage operation deletes the specified message.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179347.aspx
+func (c QueueServiceClient) DeleteMessage(queue, messageID, popReceipt string) error {
+	uri := c.client.getEndpoint(queueServiceName, pathForMessage(queue, messageID), url.Values{
+		"popreceipt": {popReceipt}})
+	resp, err := c.client.exec(http.MethodDelete, uri, c.client.getStandardHeaders(), nil, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+	return checkRespCode(resp.statusCode, []int{http.StatusNoContent})
+}
+
+// UpdateMessage operation deletes the specified message.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/hh452234.aspx
+func (c QueueServiceClient) UpdateMessage(queue string, messageID string, message string, params UpdateMessageParameters) error {
+	uri := c.client.getEndpoint(queueServiceName, pathForMessage(queue, messageID), params.getParameters())
+	req := putMessageRequest{MessageText: message}
+	body, nn, err := xmlMarshal(req)
+	if err != nil {
+		return err
+	}
+	headers := c.client.getStandardHeaders()
+	headers["Content-Length"] = fmt.Sprintf("%d", nn)
+	resp, err := c.client.exec(http.MethodPut, uri, headers, body, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+	return checkRespCode(resp.statusCode, []int{http.StatusNoContent})
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/share.go

@@ -0,0 +1,186 @@
+package storage
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"strconv"
+)
+
+// Share represents an Azure file share.
+type Share struct {
+	fsc        *FileServiceClient
+	Name       string          `xml:"Name"`
+	Properties ShareProperties `xml:"Properties"`
+	Metadata   map[string]string
+}
+
+// ShareProperties contains various properties of a share.
+type ShareProperties struct {
+	LastModified string `xml:"Last-Modified"`
+	Etag         string `xml:"Etag"`
+	Quota        int    `xml:"Quota"`
+}
+
+// builds the complete path for this share object.
+func (s *Share) buildPath() string {
+	return fmt.Sprintf("/%s", s.Name)
+}
+
+// Create this share under the associated account.
+// If a share with the same name already exists, the operation fails.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn167008.aspx
+func (s *Share) Create() error {
+	headers, err := s.fsc.createResource(s.buildPath(), resourceShare, mergeMDIntoExtraHeaders(s.Metadata, nil))
+	if err != nil {
+		return err
+	}
+
+	s.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// CreateIfNotExists creates this share under the associated account if
+// it does not exist. Returns true if the share is newly created or false if
+// the share already exists.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn167008.aspx
+func (s *Share) CreateIfNotExists() (bool, error) {
+	resp, err := s.fsc.createResourceNoClose(s.buildPath(), resourceShare, nil)
+	if resp != nil {
+		defer resp.body.Close()
+		if resp.statusCode == http.StatusCreated || resp.statusCode == http.StatusConflict {
+			if resp.statusCode == http.StatusCreated {
+				s.updateEtagAndLastModified(resp.headers)
+				return true, nil
+			}
+			return false, s.FetchAttributes()
+		}
+	}
+
+	return false, err
+}
+
+// Delete marks this share for deletion. The share along with any files
+// and directories contained within it are later deleted during garbage
+// collection.  If the share does not exist the operation fails
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn689090.aspx
+func (s *Share) Delete() error {
+	return s.fsc.deleteResource(s.buildPath(), resourceShare)
+}
+
+// DeleteIfExists operation marks this share for deletion if it exists.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dn689090.aspx
+func (s *Share) DeleteIfExists() (bool, error) {
+	resp, err := s.fsc.deleteResourceNoClose(s.buildPath(), resourceShare)
+	if resp != nil {
+		defer resp.body.Close()
+		if resp.statusCode == http.StatusAccepted || resp.statusCode == http.StatusNotFound {
+			return resp.statusCode == http.StatusAccepted, nil
+		}
+	}
+	return false, err
+}
+
+// Exists returns true if this share already exists
+// on the storage account, otherwise returns false.
+func (s *Share) Exists() (bool, error) {
+	exists, headers, err := s.fsc.resourceExists(s.buildPath(), resourceShare)
+	if exists {
+		s.updateEtagAndLastModified(headers)
+		s.updateQuota(headers)
+	}
+	return exists, err
+}
+
+// FetchAttributes retrieves metadata and properties for this share.
+func (s *Share) FetchAttributes() error {
+	headers, err := s.fsc.getResourceHeaders(s.buildPath(), compNone, resourceShare, http.MethodHead)
+	if err != nil {
+		return err
+	}
+
+	s.updateEtagAndLastModified(headers)
+	s.updateQuota(headers)
+	s.Metadata = getMetadataFromHeaders(headers)
+
+	return nil
+}
+
+// GetRootDirectoryReference returns a Directory object at the root of this share.
+func (s *Share) GetRootDirectoryReference() *Directory {
+	return &Directory{
+		fsc:   s.fsc,
+		share: s,
+	}
+}
+
+// ServiceClient returns the FileServiceClient associated with this share.
+func (s *Share) ServiceClient() *FileServiceClient {
+	return s.fsc
+}
+
+// SetMetadata replaces the metadata for this share.
+//
+// Some keys may be converted to Camel-Case before sending. All keys
+// are returned in lower case by GetShareMetadata. HTTP header names
+// are case-insensitive so case munging should not matter to other
+// applications either.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/dd179414.aspx
+func (s *Share) SetMetadata() error {
+	headers, err := s.fsc.setResourceHeaders(s.buildPath(), compMetadata, resourceShare, mergeMDIntoExtraHeaders(s.Metadata, nil))
+	if err != nil {
+		return err
+	}
+
+	s.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// SetProperties sets system properties for this share.
+//
+// Some keys may be converted to Camel-Case before sending. All keys
+// are returned in lower case by SetShareProperties. HTTP header names
+// are case-insensitive so case munging should not matter to other
+// applications either.
+//
+// See https://msdn.microsoft.com/en-us/library/azure/mt427368.aspx
+func (s *Share) SetProperties() error {
+	if s.Properties.Quota < 1 || s.Properties.Quota > 5120 {
+		return fmt.Errorf("invalid value %v for quota, valid values are [1, 5120]", s.Properties.Quota)
+	}
+
+	headers, err := s.fsc.setResourceHeaders(s.buildPath(), compProperties, resourceShare, map[string]string{
+		"x-ms-share-quota": strconv.Itoa(s.Properties.Quota),
+	})
+	if err != nil {
+		return err
+	}
+
+	s.updateEtagAndLastModified(headers)
+	return nil
+}
+
+// updates Etag and last modified date
+func (s *Share) updateEtagAndLastModified(headers http.Header) {
+	s.Properties.Etag = headers.Get("Etag")
+	s.Properties.LastModified = headers.Get("Last-Modified")
+}
+
+// updates quota value
+func (s *Share) updateQuota(headers http.Header) {
+	quota, err := strconv.Atoi(headers.Get("x-ms-share-quota"))
+	if err == nil {
+		s.Properties.Quota = quota
+	}
+}
+
+// URL gets the canonical URL to this share. This method does not create a publicly accessible
+// URL if the share is private and this method does not check if the share exists.
+func (s *Share) URL() string {
+	return s.fsc.client.getEndpoint(fileServiceName, s.buildPath(), url.Values{})
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/storagepolicy.go

@@ -0,0 +1,47 @@
+package storage
+
+import (
+	"strings"
+	"time"
+)
+
+// AccessPolicyDetailsXML has specifics about an access policy
+// annotated with XML details.
+type AccessPolicyDetailsXML struct {
+	StartTime  time.Time `xml:"Start"`
+	ExpiryTime time.Time `xml:"Expiry"`
+	Permission string    `xml:"Permission"`
+}
+
+// SignedIdentifier is a wrapper for a specific policy
+type SignedIdentifier struct {
+	ID           string                 `xml:"Id"`
+	AccessPolicy AccessPolicyDetailsXML `xml:"AccessPolicy"`
+}
+
+// SignedIdentifiers part of the response from GetPermissions call.
+type SignedIdentifiers struct {
+	SignedIdentifiers []SignedIdentifier `xml:"SignedIdentifier"`
+}
+
+// AccessPolicy is the response type from the GetPermissions call.
+type AccessPolicy struct {
+	SignedIdentifiersList SignedIdentifiers `xml:"SignedIdentifiers"`
+}
+
+// convertAccessPolicyToXMLStructs converts between AccessPolicyDetails which is a struct better for API usage to the
+// AccessPolicy struct which will get converted to XML.
+func convertAccessPolicyToXMLStructs(id string, startTime time.Time, expiryTime time.Time, permissions string) SignedIdentifier {
+	return SignedIdentifier{
+		ID: id,
+		AccessPolicy: AccessPolicyDetailsXML{
+			StartTime:  startTime.UTC().Round(time.Second),
+			ExpiryTime: expiryTime.UTC().Round(time.Second),
+			Permission: permissions,
+		},
+	}
+}
+
+func updatePermissions(permissions, permission string) bool {
+	return strings.Contains(permissions, permission)
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/table.go

@@ -0,0 +1,258 @@
+package storage
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"time"
+)
+
+// TableServiceClient contains operations for Microsoft Azure Table Storage
+// Service.
+type TableServiceClient struct {
+	client Client
+	auth   authentication
+}
+
+// AzureTable is the typedef of the Azure Table name
+type AzureTable string
+
+const (
+	tablesURIPath = "/Tables"
+)
+
+type createTableRequest struct {
+	TableName string `json:"TableName"`
+}
+
+// TableAccessPolicy are used for SETTING table policies
+type TableAccessPolicy struct {
+	ID         string
+	StartTime  time.Time
+	ExpiryTime time.Time
+	CanRead    bool
+	CanAppend  bool
+	CanUpdate  bool
+	CanDelete  bool
+}
+
+func pathForTable(table AzureTable) string { return fmt.Sprintf("%s", table) }
+
+func (c *TableServiceClient) getStandardHeaders() map[string]string {
+	return map[string]string{
+		"x-ms-version":   "2015-02-21",
+		"x-ms-date":      currentTimeRfc1123Formatted(),
+		"Accept":         "application/json;odata=nometadata",
+		"Accept-Charset": "UTF-8",
+		"Content-Type":   "application/json",
+		userAgentHeader:  c.client.userAgent,
+	}
+}
+
+// QueryTables returns the tables created in the
+// *TableServiceClient storage account.
+func (c *TableServiceClient) QueryTables() ([]AzureTable, error) {
+	uri := c.client.getEndpoint(tableServiceName, tablesURIPath, url.Values{})
+
+	headers := c.getStandardHeaders()
+	headers["Content-Length"] = "0"
+
+	resp, err := c.client.execInternalJSON(http.MethodGet, uri, headers, nil, c.auth)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.body.Close()
+
+	if err := checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
+		return nil, err
+	}
+
+	buf := new(bytes.Buffer)
+	if _, err := buf.ReadFrom(resp.body); err != nil {
+		return nil, err
+	}
+
+	var respArray queryTablesResponse
+	if err := json.Unmarshal(buf.Bytes(), &respArray); err != nil {
+		return nil, err
+	}
+
+	s := make([]AzureTable, len(respArray.TableName))
+	for i, elem := range respArray.TableName {
+		s[i] = AzureTable(elem.TableName)
+	}
+
+	return s, nil
+}
+
+// CreateTable creates the table given the specific
+// name. This function fails if the name is not compliant
+// with the specification or the tables already exists.
+func (c *TableServiceClient) CreateTable(table AzureTable) error {
+	uri := c.client.getEndpoint(tableServiceName, tablesURIPath, url.Values{})
+
+	headers := c.getStandardHeaders()
+
+	req := createTableRequest{TableName: string(table)}
+	buf := new(bytes.Buffer)
+
+	if err := json.NewEncoder(buf).Encode(req); err != nil {
+		return err
+	}
+
+	headers["Content-Length"] = fmt.Sprintf("%d", buf.Len())
+
+	resp, err := c.client.execInternalJSON(http.MethodPost, uri, headers, buf, c.auth)
+
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+
+	if err := checkRespCode(resp.statusCode, []int{http.StatusCreated}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// DeleteTable deletes the table given the specific
+// name. This function fails if the table is not present.
+// Be advised: DeleteTable deletes all the entries
+// that may be present.
+func (c *TableServiceClient) DeleteTable(table AzureTable) error {
+	uri := c.client.getEndpoint(tableServiceName, tablesURIPath, url.Values{})
+	uri += fmt.Sprintf("('%s')", string(table))
+
+	headers := c.getStandardHeaders()
+
+	headers["Content-Length"] = "0"
+
+	resp, err := c.client.execInternalJSON(http.MethodDelete, uri, headers, nil, c.auth)
+
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+
+	if err := checkRespCode(resp.statusCode, []int{http.StatusNoContent}); err != nil {
+		return err
+
+	}
+	return nil
+}
+
+// SetTablePermissions sets up table ACL permissions as per REST details https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/Set-Table-ACL
+func (c *TableServiceClient) SetTablePermissions(table AzureTable, policies []TableAccessPolicy, timeout uint) (err error) {
+	params := url.Values{"comp": {"acl"}}
+
+	if timeout > 0 {
+		params.Add("timeout", fmt.Sprint(timeout))
+	}
+
+	uri := c.client.getEndpoint(tableServiceName, string(table), params)
+	headers := c.client.getStandardHeaders()
+
+	body, length, err := generateTableACLPayload(policies)
+	if err != nil {
+		return err
+	}
+	headers["Content-Length"] = fmt.Sprintf("%v", length)
+
+	resp, err := c.client.execInternalJSON(http.MethodPut, uri, headers, body, c.auth)
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+
+	if err := checkRespCode(resp.statusCode, []int{http.StatusNoContent}); err != nil {
+		return err
+	}
+	return nil
+}
+
+func generateTableACLPayload(policies []TableAccessPolicy) (io.Reader, int, error) {
+	sil := SignedIdentifiers{
+		SignedIdentifiers: []SignedIdentifier{},
+	}
+	for _, tap := range policies {
+		permission := generateTablePermissions(&tap)
+		signedIdentifier := convertAccessPolicyToXMLStructs(tap.ID, tap.StartTime, tap.ExpiryTime, permission)
+		sil.SignedIdentifiers = append(sil.SignedIdentifiers, signedIdentifier)
+	}
+	return xmlMarshal(sil)
+}
+
+// GetTablePermissions gets the table ACL permissions, as per REST details https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/get-table-acl
+func (c *TableServiceClient) GetTablePermissions(table AzureTable, timeout int) (permissionResponse []TableAccessPolicy, err error) {
+	params := url.Values{"comp": {"acl"}}
+
+	if timeout > 0 {
+		params.Add("timeout", strconv.Itoa(timeout))
+	}
+
+	uri := c.client.getEndpoint(tableServiceName, string(table), params)
+	headers := c.client.getStandardHeaders()
+	resp, err := c.client.execInternalJSON(http.MethodGet, uri, headers, nil, c.auth)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.body.Close()
+
+	if err = checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
+		return nil, err
+	}
+
+	var ap AccessPolicy
+	err = xmlUnmarshal(resp.body, &ap.SignedIdentifiersList)
+	if err != nil {
+		return nil, err
+	}
+	out := updateTableAccessPolicy(ap)
+	return out, nil
+}
+
+func updateTableAccessPolicy(ap AccessPolicy) []TableAccessPolicy {
+	out := []TableAccessPolicy{}
+	for _, policy := range ap.SignedIdentifiersList.SignedIdentifiers {
+		tap := TableAccessPolicy{
+			ID:         policy.ID,
+			StartTime:  policy.AccessPolicy.StartTime,
+			ExpiryTime: policy.AccessPolicy.ExpiryTime,
+		}
+		tap.CanRead = updatePermissions(policy.AccessPolicy.Permission, "r")
+		tap.CanAppend = updatePermissions(policy.AccessPolicy.Permission, "a")
+		tap.CanUpdate = updatePermissions(policy.AccessPolicy.Permission, "u")
+		tap.CanDelete = updatePermissions(policy.AccessPolicy.Permission, "d")
+
+		out = append(out, tap)
+	}
+	return out
+}
+
+func generateTablePermissions(tap *TableAccessPolicy) (permissions string) {
+	// generate the permissions string (raud).
+	// still want the end user API to have bool flags.
+	permissions = ""
+
+	if tap.CanRead {
+		permissions += "r"
+	}
+
+	if tap.CanAppend {
+		permissions += "a"
+	}
+
+	if tap.CanUpdate {
+		permissions += "u"
+	}
+
+	if tap.CanDelete {
+		permissions += "d"
+	}
+	return permissions
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/table_entities.go

@@ -0,0 +1,345 @@
+package storage
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"reflect"
+)
+
+// Annotating as secure for gas scanning
+/* #nosec */
+const (
+	partitionKeyNode                    = "PartitionKey"
+	rowKeyNode                          = "RowKey"
+	tag                                 = "table"
+	tagIgnore                           = "-"
+	continuationTokenPartitionKeyHeader = "X-Ms-Continuation-Nextpartitionkey"
+	continuationTokenRowHeader          = "X-Ms-Continuation-Nextrowkey"
+	maxTopParameter                     = 1000
+)
+
+type queryTablesResponse struct {
+	TableName []struct {
+		TableName string `json:"TableName"`
+	} `json:"value"`
+}
+
+const (
+	tableOperationTypeInsert          = iota
+	tableOperationTypeUpdate          = iota
+	tableOperationTypeMerge           = iota
+	tableOperationTypeInsertOrReplace = iota
+	tableOperationTypeInsertOrMerge   = iota
+)
+
+type tableOperation int
+
+// TableEntity interface specifies
+// the functions needed to support
+// marshaling and unmarshaling into
+// Azure Tables. The struct must only contain
+// simple types because Azure Tables do not
+// support hierarchy.
+type TableEntity interface {
+	PartitionKey() string
+	RowKey() string
+	SetPartitionKey(string) error
+	SetRowKey(string) error
+}
+
+// ContinuationToken is an opaque (ie not useful to inspect)
+// struct that Get... methods can return if there are more
+// entries to be returned than the ones already
+// returned. Just pass it to the same function to continue
+// receiving the remaining entries.
+type ContinuationToken struct {
+	NextPartitionKey string
+	NextRowKey       string
+}
+
+type getTableEntriesResponse struct {
+	Elements []map[string]interface{} `json:"value"`
+}
+
+// QueryTableEntities queries the specified table and returns the unmarshaled
+// entities of type retType.
+// top parameter limits the returned entries up to top. Maximum top
+// allowed by Azure API is 1000. In case there are more than top entries to be
+// returned the function will return a non nil *ContinuationToken. You can call the
+// same function again passing the received ContinuationToken as previousContToken
+// parameter in order to get the following entries. The query parameter
+// is the odata query. To retrieve all the entries pass the empty string.
+// The function returns a pointer to a TableEntity slice, the *ContinuationToken
+// if there are more entries to be returned and an error in case something went
+// wrong.
+//
+// Example:
+// 		entities, cToken, err = tSvc.QueryTableEntities("table", cToken, reflect.TypeOf(entity), 20, "")
+func (c *TableServiceClient) QueryTableEntities(tableName AzureTable, previousContToken *ContinuationToken, retType reflect.Type, top int, query string) ([]TableEntity, *ContinuationToken, error) {
+	if top > maxTopParameter {
+		return nil, nil, fmt.Errorf("top accepts at maximum %d elements. Requested %d instead", maxTopParameter, top)
+	}
+
+	uri := c.client.getEndpoint(tableServiceName, pathForTable(tableName), url.Values{})
+	uri += fmt.Sprintf("?$top=%d", top)
+	if query != "" {
+		uri += fmt.Sprintf("&$filter=%s", url.QueryEscape(query))
+	}
+
+	if previousContToken != nil {
+		uri += fmt.Sprintf("&NextPartitionKey=%s&NextRowKey=%s", previousContToken.NextPartitionKey, previousContToken.NextRowKey)
+	}
+
+	headers := c.getStandardHeaders()
+
+	headers["Content-Length"] = "0"
+
+	resp, err := c.client.execInternalJSON(http.MethodGet, uri, headers, nil, c.auth)
+
+	if err != nil {
+		return nil, nil, err
+	}
+
+	contToken := extractContinuationTokenFromHeaders(resp.headers)
+
+	defer resp.body.Close()
+
+	if err = checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
+		return nil, contToken, err
+	}
+
+	retEntries, err := deserializeEntity(retType, resp.body)
+	if err != nil {
+		return nil, contToken, err
+	}
+
+	return retEntries, contToken, nil
+}
+
+// InsertEntity inserts an entity in the specified table.
+// The function fails if there is an entity with the same
+// PartitionKey and RowKey in the table.
+func (c *TableServiceClient) InsertEntity(table AzureTable, entity TableEntity) error {
+	if sc, err := c.execTable(table, entity, false, http.MethodPost); err != nil {
+		return checkRespCode(sc, []int{http.StatusCreated})
+	}
+
+	return nil
+}
+
+func (c *TableServiceClient) execTable(table AzureTable, entity TableEntity, specifyKeysInURL bool, method string) (int, error) {
+	uri := c.client.getEndpoint(tableServiceName, pathForTable(table), url.Values{})
+	if specifyKeysInURL {
+		uri += fmt.Sprintf("(PartitionKey='%s',RowKey='%s')", url.QueryEscape(entity.PartitionKey()), url.QueryEscape(entity.RowKey()))
+	}
+
+	headers := c.getStandardHeaders()
+
+	var buf bytes.Buffer
+
+	if err := injectPartitionAndRowKeys(entity, &buf); err != nil {
+		return 0, err
+	}
+
+	headers["Content-Length"] = fmt.Sprintf("%d", buf.Len())
+
+	resp, err := c.client.execInternalJSON(method, uri, headers, &buf, c.auth)
+
+	if err != nil {
+		return 0, err
+	}
+
+	defer resp.body.Close()
+
+	return resp.statusCode, nil
+}
+
+// UpdateEntity updates the contents of an entity with the
+// one passed as parameter. The function fails if there is no entity
+// with the same PartitionKey and RowKey in the table.
+func (c *TableServiceClient) UpdateEntity(table AzureTable, entity TableEntity) error {
+	if sc, err := c.execTable(table, entity, true, http.MethodPut); err != nil {
+		return checkRespCode(sc, []int{http.StatusNoContent})
+	}
+	return nil
+}
+
+// MergeEntity merges the contents of an entity with the
+// one passed as parameter.
+// The function fails if there is no entity
+// with the same PartitionKey and RowKey in the table.
+func (c *TableServiceClient) MergeEntity(table AzureTable, entity TableEntity) error {
+	if sc, err := c.execTable(table, entity, true, "MERGE"); err != nil {
+		return checkRespCode(sc, []int{http.StatusNoContent})
+	}
+	return nil
+}
+
+// DeleteEntityWithoutCheck deletes the entity matching by
+// PartitionKey and RowKey. There is no check on IfMatch
+// parameter so the entity is always deleted.
+// The function fails if there is no entity
+// with the same PartitionKey and RowKey in the table.
+func (c *TableServiceClient) DeleteEntityWithoutCheck(table AzureTable, entity TableEntity) error {
+	return c.DeleteEntity(table, entity, "*")
+}
+
+// DeleteEntity deletes the entity matching by
+// PartitionKey, RowKey and ifMatch field.
+// The function fails if there is no entity
+// with the same PartitionKey and RowKey in the table or
+// the ifMatch is different.
+func (c *TableServiceClient) DeleteEntity(table AzureTable, entity TableEntity, ifMatch string) error {
+	uri := c.client.getEndpoint(tableServiceName, pathForTable(table), url.Values{})
+	uri += fmt.Sprintf("(PartitionKey='%s',RowKey='%s')", url.QueryEscape(entity.PartitionKey()), url.QueryEscape(entity.RowKey()))
+
+	headers := c.getStandardHeaders()
+
+	headers["Content-Length"] = "0"
+	headers["If-Match"] = ifMatch
+
+	resp, err := c.client.execInternalJSON(http.MethodDelete, uri, headers, nil, c.auth)
+
+	if err != nil {
+		return err
+	}
+	defer resp.body.Close()
+
+	if err := checkRespCode(resp.statusCode, []int{http.StatusNoContent}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// InsertOrReplaceEntity inserts an entity in the specified table
+// or replaced the existing one.
+func (c *TableServiceClient) InsertOrReplaceEntity(table AzureTable, entity TableEntity) error {
+	if sc, err := c.execTable(table, entity, true, http.MethodPut); err != nil {
+		return checkRespCode(sc, []int{http.StatusNoContent})
+	}
+	return nil
+}
+
+// InsertOrMergeEntity inserts an entity in the specified table
+// or merges the existing one.
+func (c *TableServiceClient) InsertOrMergeEntity(table AzureTable, entity TableEntity) error {
+	if sc, err := c.execTable(table, entity, true, "MERGE"); err != nil {
+		return checkRespCode(sc, []int{http.StatusNoContent})
+	}
+	return nil
+}
+
+func injectPartitionAndRowKeys(entity TableEntity, buf *bytes.Buffer) error {
+	if err := json.NewEncoder(buf).Encode(entity); err != nil {
+		return err
+	}
+
+	dec := make(map[string]interface{})
+	if err := json.NewDecoder(buf).Decode(&dec); err != nil {
+		return err
+	}
+
+	// Inject PartitionKey and RowKey
+	dec[partitionKeyNode] = entity.PartitionKey()
+	dec[rowKeyNode] = entity.RowKey()
+
+	// Remove tagged fields
+	// The tag is defined in the const section
+	// This is useful to avoid storing the PartitionKey and RowKey twice.
+	numFields := reflect.ValueOf(entity).Elem().NumField()
+	for i := 0; i < numFields; i++ {
+		f := reflect.ValueOf(entity).Elem().Type().Field(i)
+
+		if f.Tag.Get(tag) == tagIgnore {
+			// we must look for its JSON name in the dictionary
+			// as the user can rename it using a tag
+			jsonName := f.Name
+			if f.Tag.Get("json") != "" {
+				jsonName = f.Tag.Get("json")
+			}
+			delete(dec, jsonName)
+		}
+	}
+
+	buf.Reset()
+
+	if err := json.NewEncoder(buf).Encode(&dec); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func deserializeEntity(retType reflect.Type, reader io.Reader) ([]TableEntity, error) {
+	buf := new(bytes.Buffer)
+
+	var ret getTableEntriesResponse
+	if err := json.NewDecoder(reader).Decode(&ret); err != nil {
+		return nil, err
+	}
+
+	tEntries := make([]TableEntity, len(ret.Elements))
+
+	for i, entry := range ret.Elements {
+
+		buf.Reset()
+		if err := json.NewEncoder(buf).Encode(entry); err != nil {
+			return nil, err
+		}
+
+		dec := make(map[string]interface{})
+		if err := json.NewDecoder(buf).Decode(&dec); err != nil {
+			return nil, err
+		}
+
+		var pKey, rKey string
+		// strip pk and rk
+		for key, val := range dec {
+			switch key {
+			case partitionKeyNode:
+				pKey = val.(string)
+			case rowKeyNode:
+				rKey = val.(string)
+			}
+		}
+
+		delete(dec, partitionKeyNode)
+		delete(dec, rowKeyNode)
+
+		buf.Reset()
+		if err := json.NewEncoder(buf).Encode(dec); err != nil {
+			return nil, err
+		}
+
+		// Create a empty retType instance
+		tEntries[i] = reflect.New(retType.Elem()).Interface().(TableEntity)
+		// Popolate it with the values
+		if err := json.NewDecoder(buf).Decode(&tEntries[i]); err != nil {
+			return nil, err
+		}
+
+		// Reset PartitionKey and RowKey
+		if err := tEntries[i].SetPartitionKey(pKey); err != nil {
+			return nil, err
+		}
+		if err := tEntries[i].SetRowKey(rKey); err != nil {
+			return nil, err
+		}
+	}
+
+	return tEntries, nil
+}
+
+func extractContinuationTokenFromHeaders(h http.Header) *ContinuationToken {
+	ct := ContinuationToken{h.Get(continuationTokenPartitionKeyHeader), h.Get(continuationTokenRowHeader)}
+
+	if ct.NextPartitionKey != "" && ct.NextRowKey != "" {
+		return &ct
+	}
+	return nil
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/util.go

@@ -0,0 +1,85 @@
+package storage
+
+import (
+	"bytes"
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"reflect"
+	"time"
+)
+
+func (c Client) computeHmac256(message string) string {
+	h := hmac.New(sha256.New, c.accountKey)
+	h.Write([]byte(message))
+	return base64.StdEncoding.EncodeToString(h.Sum(nil))
+}
+
+func currentTimeRfc1123Formatted() string {
+	return timeRfc1123Formatted(time.Now().UTC())
+}
+
+func timeRfc1123Formatted(t time.Time) string {
+	return t.Format(http.TimeFormat)
+}
+
+func mergeParams(v1, v2 url.Values) url.Values {
+	out := url.Values{}
+	for k, v := range v1 {
+		out[k] = v
+	}
+	for k, v := range v2 {
+		vals, ok := out[k]
+		if ok {
+			vals = append(vals, v...)
+			out[k] = vals
+		} else {
+			out[k] = v
+		}
+	}
+	return out
+}
+
+func prepareBlockListRequest(blocks []Block) string {
+	s := `<?xml version="1.0" encoding="utf-8"?><BlockList>`
+	for _, v := range blocks {
+		s += fmt.Sprintf("<%s>%s</%s>", v.Status, v.ID, v.Status)
+	}
+	s += `</BlockList>`
+	return s
+}
+
+func xmlUnmarshal(body io.Reader, v interface{}) error {
+	data, err := ioutil.ReadAll(body)
+	if err != nil {
+		return err
+	}
+	return xml.Unmarshal(data, v)
+}
+
+func xmlMarshal(v interface{}) (io.Reader, int, error) {
+	b, err := xml.Marshal(v)
+	if err != nil {
+		return nil, 0, err
+	}
+	return bytes.NewReader(b), len(b), nil
+}
+
+func headersFromStruct(v interface{}) map[string]string {
+	headers := make(map[string]string)
+	value := reflect.ValueOf(v)
+	for i := 0; i < value.NumField(); i++ {
+		key := value.Type().Field(i).Tag.Get("header")
+		val := value.Field(i).String()
+		if key != "" && val != "" {
+			headers[key] = val
+		}
+	}
+	return headers
+}

vendor/github.com/Azure/azure-sdk-for-go/storage/version.go

@@ -0,0 +1,5 @@
+package storage
+
+var (
+	sdkVersion = "8.0.0-beta"
+)

vendor/github.com/minio/cli/help.go

@@ -13,69 +13,68 @@ import (
 // cli.go uses text/template to render templates. You can
 // render custom help text by setting this variable.
 var AppHelpTemplate = `NAME:
-   {{.Name}}{{if .Usage}} - {{.Usage}}{{end}}
+  {{.Name}}{{if .Usage}} - {{.Usage}}{{end}}
 
 USAGE:
-   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
+  {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
 
 VERSION:
-   {{.Version}}{{end}}{{end}}{{if .Description}}
+  {{.Version}}{{end}}{{end}}{{if .Description}}
 
 DESCRIPTION:
-   {{.Description}}{{end}}{{if len .Authors}}
+  {{.Description}}{{end}}{{if len .Authors}}
 
 AUTHOR{{with $length := len .Authors}}{{if ne 1 $length}}S{{end}}{{end}}:
-   {{range $index, $author := .Authors}}{{if $index}}
-   {{end}}{{$author}}{{end}}{{end}}{{if .VisibleCommands}}
+  {{range $index, $author := .Authors}}{{if $index}}
+  {{end}}{{$author}}{{end}}{{end}}{{if .VisibleCommands}}
 
 COMMANDS:{{range .VisibleCategories}}{{if .Name}}
-   {{.Name}}:{{end}}{{range .VisibleCommands}}
-     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
+  {{.Name}}:{{end}}{{range .VisibleCommands}}
+    {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
 
-GLOBAL OPTIONS:
-   {{range $index, $option := .VisibleFlags}}{{if $index}}
-   {{end}}{{$option}}{{end}}{{end}}{{if .Copyright}}
+GLOBAL FLAGS:
+  {{range $index, $option := .VisibleFlags}}{{if $index}}
+  {{end}}{{$option}}{{end}}{{end}}{{if .Copyright}}
 
 COPYRIGHT:
-   {{.Copyright}}{{end}}
+  {{.Copyright}}{{end}}
 `
 
 // CommandHelpTemplate is the text template for the command help topic.
 // cli.go uses text/template to render templates. You can
 // render custom help text by setting this variable.
 var CommandHelpTemplate = `NAME:
-   {{.HelpName}} - {{.Usage}}
+  {{.HelpName}} - {{.Usage}}
 
 USAGE:
-   {{.HelpName}}{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{if .Category}}
+  {{.HelpName}}{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{if .Category}}
 
 CATEGORY:
-   {{.Category}}{{end}}{{if .Description}}
+  {{.Category}}{{end}}{{if .Description}}
 
 DESCRIPTION:
-   {{.Description}}{{end}}{{if .VisibleFlags}}
+  {{.Description}}{{end}}{{if .VisibleFlags}}
 
-OPTIONS:
-   {{range .VisibleFlags}}{{.}}
-   {{end}}{{end}}
+FLAGS:
+  {{range .VisibleFlags}}{{.}}
+  {{end}}{{end}}
 `
 
 // SubcommandHelpTemplate is the text template for the subcommand help topic.
 // cli.go uses text/template to render templates. You can
 // render custom help text by setting this variable.
 var SubcommandHelpTemplate = `NAME:
-   {{.HelpName}} - {{if .Description}}{{.Description}}{{else}}{{.Usage}}{{end}}
+  {{.HelpName}} - {{if .Description}}{{.Description}}{{else}}{{.Usage}}{{end}}
 
 USAGE:
-   {{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
+  {{.HelpName}} COMMAND{{if .VisibleFlags}} [COMMAND FLAGS | -h]{{end}} [ARGUMENTS...]
 
-COMMANDS:{{range .VisibleCategories}}{{if .Name}}
-   {{.Name}}:{{end}}{{range .VisibleCommands}}
-     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}
-{{end}}{{if .VisibleFlags}}
-OPTIONS:
-   {{range .VisibleFlags}}{{.}}
-   {{end}}{{end}}
+COMMANDS:
+  {{range .VisibleCommands}}{{join .Names ", "}}{{ "\t" }}{{.Usage}}
+  {{end}}{{if .VisibleFlags}}
+FLAGS:
+  {{range .VisibleFlags}}{{.}}
+  {{end}}{{end}}
 `
 
 var helpCommand = Command{

vendor/vendor.json

@@ -2,6 +2,12 @@
 	"comment": "",
 	"ignore": "test",
 	"package": [
+		{
+			"checksumSHA1": "rK3ght7KTtHGdm0V4+U7fv9+tUU=",
+			"path": "github.com/Azure/azure-sdk-for-go/storage",
+			"revision": "8e625d1702a32d01cef05a9252198d231c4af113",
+			"revisionTime": "2017-02-08T01:01:20Z"
+		},
 		{
 			"path": "github.com/Sirupsen/logrus",
 			"revision": "32055c351ea8b00b96d70f28db48d9840feaf0ec",
@@ -175,10 +181,10 @@
 			"revisionTime": "2016-07-23T06:10:19Z"
 		},
 		{
-			"checksumSHA1": "7PcmjItrQSx/1sZ6Q395LCzT+iw=",
+			"checksumSHA1": "fUWokilZyc1QDKnIgCDJE8n1S9U=",
 			"path": "github.com/minio/cli",
-			"revision": "06bb2061ef1493532baf0444818eb5fb4c83caac",
-			"revisionTime": "2017-02-20T03:57:28Z"
+			"revision": "b8ae5507c0ceceecc22d5dbd386b58fbd4fdce72",
+			"revisionTime": "2017-02-27T07:32:28Z"
 		},
 		{
 			"checksumSHA1": "NBGyq2+iTtJvJ+ElG4FzHLe1WSY=",