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blob.go
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blob.go
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package storage
import (
"bytes"
"encoding/xml"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"time"
)
// BlobStorageClient contains operations for Microsoft Azure Blob Storage
// Service.
type BlobStorageClient struct {
client Client
}
// A Container is an entry in ContainerListResponse.
type Container struct {
Name string `xml:"Name"`
Properties ContainerProperties `xml:"Properties"`
// TODO (ahmetalpbalkan) Metadata
}
// ContainerProperties contains various properties of a container returned from
// various endpoints like ListContainers.
type ContainerProperties struct {
LastModified string `xml:"Last-Modified"`
Etag string `xml:"Etag"`
LeaseStatus string `xml:"LeaseStatus"`
LeaseState string `xml:"LeaseState"`
LeaseDuration string `xml:"LeaseDuration"`
// TODO (ahmetalpbalkan) remaining fields
}
// ContainerListResponse contains the response fields from
// ListContainers call.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179352.aspx
type ContainerListResponse 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"`
Containers []Container `xml:"Containers>Container"`
}
// A Blob is an entry in BlobListResponse.
type Blob struct {
Name string `xml:"Name"`
Properties BlobProperties `xml:"Properties"`
// TODO (ahmetalpbalkan) Metadata
}
// BlobProperties contains various properties of a blob
// returned in various endpoints like ListBlobs or GetBlobProperties.
type BlobProperties struct {
LastModified string `xml:"Last-Modified"`
Etag string `xml:"Etag"`
ContentMD5 string `xml:"Content-MD5"`
ContentLength int64 `xml:"Content-Length"`
ContentType string `xml:"Content-Type"`
ContentEncoding string `xml:"Content-Encoding"`
BlobType BlobType `xml:"x-ms-blob-blob-type"`
SequenceNumber int64 `xml:"x-ms-blob-sequence-number"`
CopyID string `xml:"CopyId"`
CopyStatus string `xml:"CopyStatus"`
CopySource string `xml:"CopySource"`
CopyProgress string `xml:"CopyProgress"`
CopyCompletionTime string `xml:"CopyCompletionTime"`
CopyStatusDescription string `xml:"CopyStatusDescription"`
}
// BlobListResponse contains the response fields from ListBlobs call.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx
type BlobListResponse 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"`
Blobs []Blob `xml:"Blobs>Blob"`
}
// ListContainersParameters defines the set of customizable parameters to make a
// List Containers call.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179352.aspx
type ListContainersParameters struct {
Prefix string
Marker string
Include string
MaxResults uint
Timeout uint
}
func (p ListContainersParameters) 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
}
// ListBlobsParameters defines the set of customizable
// parameters to make a List Blobs call.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx
type ListBlobsParameters struct {
Prefix string
Delimiter string
Marker string
Include string
MaxResults uint
Timeout uint
}
func (p ListBlobsParameters) getParameters() 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
}
// BlobType defines the type of the Azure Blob.
type BlobType string
// Types of page blobs
const (
BlobTypeBlock BlobType = "BlockBlob"
BlobTypePage BlobType = "PageBlob"
)
// PageWriteType defines the type updates that are going to be
// done on the page blob.
type PageWriteType string
// Types of operations on page blobs
const (
PageWriteTypeUpdate PageWriteType = "update"
PageWriteTypeClear PageWriteType = "clear"
)
const (
blobCopyStatusPending = "pending"
blobCopyStatusSuccess = "success"
blobCopyStatusAborted = "aborted"
blobCopyStatusFailed = "failed"
)
// BlockListType is used to filter out types of blocks in a Get Blocks List call
// for a block blob.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179400.aspx for all
// block types.
type BlockListType string
// Filters for listing blocks in block blobs
const (
BlockListTypeAll BlockListType = "all"
BlockListTypeCommitted BlockListType = "committed"
BlockListTypeUncommitted BlockListType = "uncommitted"
)
// ContainerAccessType defines the access level to the container from a public
// request.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179468.aspx and "x-ms-
// blob-public-access" header.
type ContainerAccessType string
// Access options for containers
const (
ContainerAccessTypePrivate ContainerAccessType = ""
ContainerAccessTypeBlob ContainerAccessType = "blob"
ContainerAccessTypeContainer ContainerAccessType = "container"
)
// Maximum sizes (per REST API) for various concepts
const (
MaxBlobBlockSize = 4 * 1024 * 1024
MaxBlobPageSize = 4 * 1024 * 1024
)
// BlockStatus defines states a block for a block blob can
// be in.
type BlockStatus string
// List of statuses that can be used to refer to a block in a block list
const (
BlockStatusUncommitted BlockStatus = "Uncommitted"
BlockStatusCommitted BlockStatus = "Committed"
BlockStatusLatest BlockStatus = "Latest"
)
// Block is used to create Block entities for Put Block List
// call.
type Block struct {
ID string
Status BlockStatus
}
// BlockListResponse contains the response fields from Get Block List call.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179400.aspx
type BlockListResponse struct {
XMLName xml.Name `xml:"BlockList"`
CommittedBlocks []BlockResponse `xml:"CommittedBlocks>Block"`
UncommittedBlocks []BlockResponse `xml:"UncommittedBlocks>Block"`
}
// BlockResponse contains the block information returned
// in the GetBlockListCall.
type BlockResponse struct {
Name string `xml:"Name"`
Size int64 `xml:"Size"`
}
// GetPageRangesResponse contains the reponse fields from
// Get Page Ranges call.
//
// See https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
type GetPageRangesResponse struct {
XMLName xml.Name `xml:"PageList"`
PageList []PageRange `xml:"PageRange"`
}
// PageRange contains information about a page of a page blob from
// Get Pages Range call.
//
// See https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
type PageRange struct {
Start int64 `xml:"Start"`
End int64 `xml:"End"`
}
var (
errBlobCopyAborted = errors.New("storage: blob copy is aborted")
errBlobCopyIDMismatch = errors.New("storage: blob copy id is a mismatch")
)
// ListContainers returns the list of containers in a storage account along with
// pagination token and other response details.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179352.aspx
func (b BlobStorageClient) ListContainers(params ListContainersParameters) (ContainerListResponse, error) {
q := mergeParams(params.getParameters(), url.Values{"comp": {"list"}})
uri := b.client.getEndpoint(blobServiceName, "", q)
headers := b.client.getStandardHeaders()
var out ContainerListResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
defer resp.body.Close()
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// CreateContainer creates a blob container within the storage account
// with given name and access level. Returns error if container already exists.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179468.aspx
func (b BlobStorageClient) CreateContainer(name string, access ContainerAccessType) error {
resp, err := b.createContainer(name, access)
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusCreated})
}
// CreateContainerIfNotExists creates a blob container if it does not exist. Returns
// true if container is newly created or false if container already exists.
func (b BlobStorageClient) CreateContainerIfNotExists(name string, access ContainerAccessType) (bool, error) {
resp, err := b.createContainer(name, access)
if resp != nil {
defer resp.body.Close()
if resp.statusCode == http.StatusCreated || resp.statusCode == http.StatusConflict {
return resp.statusCode == http.StatusCreated, nil
}
}
return false, err
}
func (b BlobStorageClient) createContainer(name string, access ContainerAccessType) (*storageResponse, error) {
verb := "PUT"
uri := b.client.getEndpoint(blobServiceName, pathForContainer(name), url.Values{"restype": {"container"}})
headers := b.client.getStandardHeaders()
headers["Content-Length"] = "0"
if access != "" {
headers["x-ms-blob-public-access"] = string(access)
}
return b.client.exec(verb, uri, headers, nil)
}
// ContainerExists returns true if a container with given name exists
// on the storage account, otherwise returns false.
func (b BlobStorageClient) ContainerExists(name string) (bool, error) {
verb := "HEAD"
uri := b.client.getEndpoint(blobServiceName, pathForContainer(name), url.Values{"restype": {"container"}})
headers := b.client.getStandardHeaders()
resp, err := b.client.exec(verb, uri, headers, nil)
if resp != nil {
defer resp.body.Close()
if resp.statusCode == http.StatusOK || resp.statusCode == http.StatusNotFound {
return resp.statusCode == http.StatusOK, nil
}
}
return false, err
}
// DeleteContainer deletes the container with given name on the storage
// account. If the container does not exist returns error.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179408.aspx
func (b BlobStorageClient) DeleteContainer(name string) error {
resp, err := b.deleteContainer(name)
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusAccepted})
}
// DeleteContainerIfExists deletes the container with given name on the storage
// account if it exists. Returns true if container is deleted with this call, or
// false if the container did not exist at the time of the Delete Container
// operation.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179408.aspx
func (b BlobStorageClient) DeleteContainerIfExists(name string) (bool, error) {
resp, err := b.deleteContainer(name)
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
}
func (b BlobStorageClient) deleteContainer(name string) (*storageResponse, error) {
verb := "DELETE"
uri := b.client.getEndpoint(blobServiceName, pathForContainer(name), url.Values{"restype": {"container"}})
headers := b.client.getStandardHeaders()
return b.client.exec(verb, uri, headers, nil)
}
// ListBlobs returns an object that contains list of blobs in the container,
// pagination token and other information in the response of List Blobs call.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd135734.aspx
func (b BlobStorageClient) ListBlobs(container string, params ListBlobsParameters) (BlobListResponse, error) {
q := mergeParams(params.getParameters(), url.Values{
"restype": {"container"},
"comp": {"list"}})
uri := b.client.getEndpoint(blobServiceName, pathForContainer(container), q)
headers := b.client.getStandardHeaders()
var out BlobListResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
defer resp.body.Close()
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// BlobExists returns true if a blob with given name exists on the specified
// container of the storage account.
func (b BlobStorageClient) BlobExists(container, name string) (bool, error) {
verb := "HEAD"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
resp, err := b.client.exec(verb, uri, headers, nil)
if resp != nil {
defer resp.body.Close()
if resp.statusCode == http.StatusOK || resp.statusCode == http.StatusNotFound {
return resp.statusCode == http.StatusOK, nil
}
}
return false, err
}
// GetBlobURL gets the canonical URL to the blob with the specified name in the
// specified container. This method does not create a publicly accessible URL if
// the blob or container is private and this method does not check if the blob
// exists.
func (b BlobStorageClient) GetBlobURL(container, name string) string {
if container == "" {
container = "$root"
}
return b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
}
// GetBlob returns a stream to read the blob. Caller must call Close() the
// reader to close on the underlying connection.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179440.aspx
func (b BlobStorageClient) GetBlob(container, name string) (io.ReadCloser, error) {
resp, err := b.getBlobRange(container, name, "")
if err != nil {
return nil, err
}
if err := checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
return nil, err
}
return resp.body, nil
}
// GetBlobRange reads the specified range of a blob to a stream. The bytesRange
// string must be in a format like "0-", "10-100" as defined in HTTP 1.1 spec.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179440.aspx
func (b BlobStorageClient) GetBlobRange(container, name, bytesRange string) (io.ReadCloser, error) {
resp, err := b.getBlobRange(container, name, bytesRange)
if err != nil {
return nil, err
}
if err := checkRespCode(resp.statusCode, []int{http.StatusPartialContent}); err != nil {
return nil, err
}
return resp.body, nil
}
func (b BlobStorageClient) getBlobRange(container, name, bytesRange string) (*storageResponse, error) {
verb := "GET"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
if bytesRange != "" {
headers["Range"] = fmt.Sprintf("bytes=%s", bytesRange)
}
resp, err := b.client.exec(verb, uri, headers, nil)
if err != nil {
return nil, err
}
return resp, err
}
// GetBlobProperties provides various information about the specified
// blob. See https://msdn.microsoft.com/en-us/library/azure/dd179394.aspx
func (b BlobStorageClient) GetBlobProperties(container, name string) (*BlobProperties, error) {
verb := "HEAD"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
resp, err := b.client.exec(verb, uri, headers, nil)
if err != nil {
return nil, err
}
defer resp.body.Close()
if err := checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
return nil, err
}
var contentLength int64
contentLengthStr := resp.headers.Get("Content-Length")
if contentLengthStr != "" {
contentLength, err = strconv.ParseInt(contentLengthStr, 0, 64)
if err != nil {
return nil, err
}
}
var sequenceNum int64
sequenceNumStr := resp.headers.Get("x-ms-blob-sequence-number")
if sequenceNumStr != "" {
sequenceNum, err = strconv.ParseInt(sequenceNumStr, 0, 64)
if err != nil {
return nil, err
}
}
return &BlobProperties{
LastModified: resp.headers.Get("Last-Modified"),
Etag: resp.headers.Get("Etag"),
ContentMD5: resp.headers.Get("Content-MD5"),
ContentLength: contentLength,
ContentEncoding: resp.headers.Get("Content-Encoding"),
SequenceNumber: sequenceNum,
CopyCompletionTime: resp.headers.Get("x-ms-copy-completion-time"),
CopyStatusDescription: resp.headers.Get("x-ms-copy-status-description"),
CopyID: resp.headers.Get("x-ms-copy-id"),
CopyProgress: resp.headers.Get("x-ms-copy-progress"),
CopySource: resp.headers.Get("x-ms-copy-source"),
CopyStatus: resp.headers.Get("x-ms-copy-status"),
BlobType: BlobType(resp.headers.Get("x-ms-blob-type")),
}, nil
}
// CreateBlockBlob initializes an empty block blob with no blocks.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx
func (b BlobStorageClient) CreateBlockBlob(container, name string) error {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypeBlock)
headers["Content-Length"] = fmt.Sprintf("%v", 0)
resp, err := b.client.exec("PUT", uri, headers, nil)
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusCreated})
}
// PutBlock saves the given data chunk to the specified block blob with
// given ID.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx
func (b BlobStorageClient) PutBlock(container, name, blockID string, chunk []byte) error {
return b.PutBlockWithLength(container, name, blockID, uint64(len(chunk)), bytes.NewReader(chunk))
}
// PutBlockWithLength saves the given data stream of exactly specified size to
// the block blob with given ID. It is an alternative to PutBlocks where data
// comes as stream but the length is known in advance.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx
func (b BlobStorageClient) PutBlockWithLength(container, name, blockID string, size uint64, blob io.Reader) error {
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{"comp": {"block"}, "blockid": {blockID}})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypeBlock)
headers["Content-Length"] = fmt.Sprintf("%v", size)
resp, err := b.client.exec("PUT", uri, headers, blob)
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusCreated})
}
// PutBlockList saves list of blocks to the specified block blob.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179467.aspx
func (b BlobStorageClient) PutBlockList(container, name string, blocks []Block) error {
blockListXML := prepareBlockListRequest(blocks)
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{"comp": {"blocklist"}})
headers := b.client.getStandardHeaders()
headers["Content-Length"] = fmt.Sprintf("%v", len(blockListXML))
resp, err := b.client.exec("PUT", uri, headers, strings.NewReader(blockListXML))
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusCreated})
}
// GetBlockList retrieves list of blocks in the specified block blob.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179400.aspx
func (b BlobStorageClient) GetBlockList(container, name string, blockType BlockListType) (BlockListResponse, error) {
params := url.Values{"comp": {"blocklist"}, "blocklisttype": {string(blockType)}}
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), params)
headers := b.client.getStandardHeaders()
var out BlockListResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
defer resp.body.Close()
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// PutPageBlob initializes an empty page blob with specified name and maximum
// size in bytes (size must be aligned to a 512-byte boundary). A page blob must
// be created using this method before writing pages.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx
func (b BlobStorageClient) PutPageBlob(container, name string, size int64) error {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypePage)
headers["x-ms-blob-content-length"] = fmt.Sprintf("%v", size)
headers["Content-Length"] = fmt.Sprintf("%v", 0)
resp, err := b.client.exec("PUT", uri, headers, nil)
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusCreated})
}
// PutPage writes a range of pages to a page blob or clears the given range.
// In case of 'clear' writes, given chunk is discarded. Ranges must be aligned
// with 512-byte boundaries and chunk must be of size multiplies by 512.
//
// See https://msdn.microsoft.com/en-us/library/ee691975.aspx
func (b BlobStorageClient) PutPage(container, name string, startByte, endByte int64, writeType PageWriteType, chunk []byte) error {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{"comp": {"page"}})
headers := b.client.getStandardHeaders()
headers["x-ms-blob-type"] = string(BlobTypePage)
headers["x-ms-page-write"] = string(writeType)
headers["x-ms-range"] = fmt.Sprintf("bytes=%v-%v", startByte, endByte)
var contentLength int64
var data io.Reader
if writeType == PageWriteTypeClear {
contentLength = 0
data = bytes.NewReader([]byte{})
} else {
contentLength = int64(len(chunk))
data = bytes.NewReader(chunk)
}
headers["Content-Length"] = fmt.Sprintf("%v", contentLength)
resp, err := b.client.exec("PUT", uri, headers, data)
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusCreated})
}
// GetPageRanges returns the list of valid page ranges for a page blob.
//
// See https://msdn.microsoft.com/en-us/library/azure/ee691973.aspx
func (b BlobStorageClient) GetPageRanges(container, name string) (GetPageRangesResponse, error) {
path := fmt.Sprintf("%s/%s", container, name)
uri := b.client.getEndpoint(blobServiceName, path, url.Values{"comp": {"pagelist"}})
headers := b.client.getStandardHeaders()
var out GetPageRangesResponse
resp, err := b.client.exec("GET", uri, headers, nil)
if err != nil {
return out, err
}
defer resp.body.Close()
if err := checkRespCode(resp.statusCode, []int{http.StatusOK}); err != nil {
return out, err
}
err = xmlUnmarshal(resp.body, &out)
return out, err
}
// CopyBlob starts a blob copy operation and waits for the operation to
// complete. sourceBlob parameter must be a canonical URL to the blob (can be
// obtained using GetBlobURL method.) There is no SLA on blob copy and therefore
// this helper method works faster on smaller files.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd894037.aspx
func (b BlobStorageClient) CopyBlob(container, name, sourceBlob string) error {
copyID, err := b.startBlobCopy(container, name, sourceBlob)
if err != nil {
return err
}
return b.waitForBlobCopy(container, name, copyID)
}
func (b BlobStorageClient) startBlobCopy(container, name, sourceBlob string) (string, error) {
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
headers["Content-Length"] = "0"
headers["x-ms-copy-source"] = sourceBlob
resp, err := b.client.exec("PUT", uri, headers, nil)
if err != nil {
return "", err
}
defer resp.body.Close()
if err := checkRespCode(resp.statusCode, []int{http.StatusAccepted, http.StatusCreated}); err != nil {
return "", err
}
copyID := resp.headers.Get("x-ms-copy-id")
if copyID == "" {
return "", errors.New("Got empty copy id header")
}
return copyID, nil
}
func (b BlobStorageClient) waitForBlobCopy(container, name, copyID string) error {
for {
props, err := b.GetBlobProperties(container, name)
if err != nil {
return err
}
if props.CopyID != copyID {
return errBlobCopyIDMismatch
}
switch props.CopyStatus {
case blobCopyStatusSuccess:
return nil
case blobCopyStatusPending:
continue
case blobCopyStatusAborted:
return errBlobCopyAborted
case blobCopyStatusFailed:
return fmt.Errorf("storage: blob copy failed. Id=%s Description=%s", props.CopyID, props.CopyStatusDescription)
default:
return fmt.Errorf("storage: unhandled blob copy status: '%s'", props.CopyStatus)
}
}
}
// DeleteBlob deletes the given blob from the specified container.
// If the blob does not exists at the time of the Delete Blob operation, it
// returns error. See https://msdn.microsoft.com/en-us/library/azure/dd179413.aspx
func (b BlobStorageClient) DeleteBlob(container, name string) error {
resp, err := b.deleteBlob(container, name)
if err != nil {
return err
}
defer resp.body.Close()
return checkRespCode(resp.statusCode, []int{http.StatusAccepted})
}
// DeleteBlobIfExists deletes the given blob from the specified container If the
// blob is deleted with this call, returns true. Otherwise returns false.
//
// See https://msdn.microsoft.com/en-us/library/azure/dd179413.aspx
func (b BlobStorageClient) DeleteBlobIfExists(container, name string) (bool, error) {
resp, err := b.deleteBlob(container, name)
if resp != nil && (resp.statusCode == http.StatusAccepted || resp.statusCode == http.StatusNotFound) {
return resp.statusCode == http.StatusAccepted, nil
}
defer resp.body.Close()
return false, err
}
func (b BlobStorageClient) deleteBlob(container, name string) (*storageResponse, error) {
verb := "DELETE"
uri := b.client.getEndpoint(blobServiceName, pathForBlob(container, name), url.Values{})
headers := b.client.getStandardHeaders()
return b.client.exec(verb, uri, headers, nil)
}
// helper method to construct the path to a container given its name
func pathForContainer(name string) string {
return fmt.Sprintf("/%s", name)
}
// helper method to construct the path to a blob given its container and blob
// name
func pathForBlob(container, name string) string {
return fmt.Sprintf("/%s/%s", container, name)
}
// GetBlobSASURI creates an URL to the specified blob which contains the Shared
// Access Signature with specified permissions and expiration time.
//
// See https://msdn.microsoft.com/en-us/library/azure/ee395415.aspx
func (b BlobStorageClient) GetBlobSASURI(container, name string, expiry time.Time, permissions string) (string, error) {
var (
signedPermissions = permissions
blobURL = b.GetBlobURL(container, name)
)
canonicalizedResource, err := b.client.buildCanonicalizedResource(blobURL)
if err != nil {
return "", err
}
signedExpiry := expiry.Format(time.RFC3339)
signedResource := "b"
stringToSign, err := blobSASStringToSign(b.client.apiVersion, canonicalizedResource, signedExpiry, signedPermissions)
if err != nil {
return "", err
}
sig := b.client.computeHmac256(stringToSign)
sasParams := url.Values{
"sv": {b.client.apiVersion},
"se": {signedExpiry},
"sr": {signedResource},
"sp": {signedPermissions},
"sig": {sig},
}
sasURL, err := url.Parse(blobURL)
if err != nil {
return "", err
}
sasURL.RawQuery = sasParams.Encode()
return sasURL.String(), nil
}
func blobSASStringToSign(signedVersion, canonicalizedResource, signedExpiry, signedPermissions string) (string, error) {
var signedStart, signedIdentifier, rscc, rscd, rsce, rscl, rsct string
// reference: http://msdn.microsoft.com/en-us/library/azure/dn140255.aspx
if signedVersion >= "2013-08-15" {
return fmt.Sprintf("%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s", signedPermissions, signedStart, signedExpiry, canonicalizedResource, signedIdentifier, signedVersion, rscc, rscd, rsce, rscl, rsct), nil
}
return "", errors.New("storage: not implemented SAS for versions earlier than 2013-08-15")
}