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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library") | ||
|
|
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| go_library( | ||
| name = "azblob", | ||
| srcs = ["azblob.go"], | ||
| importpath = "github.com/RMI/pacta/azure/azblob", | ||
| visibility = ["//visibility:public"], | ||
| deps = [ | ||
| "//blob", | ||
| "@com_github_azure_azure_sdk_for_go_sdk_azcore//:azcore", | ||
| "@com_github_azure_azure_sdk_for_go_sdk_azcore//to", | ||
| "@com_github_azure_azure_sdk_for_go_sdk_storage_azblob//:azblob", | ||
| "@com_github_azure_azure_sdk_for_go_sdk_storage_azblob//sas", | ||
| "@com_github_azure_azure_sdk_for_go_sdk_storage_azblob//service", | ||
| ], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,185 @@ | ||
| // Package azblob wraps the existing Azure blob library to provide basic upload, | ||
| // download, and URL signing functionality against a standardized interface. | ||
| package azblob | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "sync" | ||
| "time" | ||
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| "github.com/Azure/azure-sdk-for-go/sdk/azcore" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/azcore/to" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/sas" | ||
| azservice "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/service" | ||
| "github.com/RMI/pacta/blob" | ||
| ) | ||
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| const ( | ||
| Scheme = blob.Scheme("az") | ||
| ) | ||
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| type Client struct { | ||
| storageAccount string | ||
| now func() time.Time | ||
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| client *azblob.Client | ||
| svcClient *azservice.Client | ||
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| cachedUDCMu *sync.Mutex | ||
| cachedUDC *azservice.UserDelegationCredential | ||
| cachedUDCExpiry time.Time | ||
| } | ||
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| func NewClient(creds azcore.TokenCredential, storageAccount string) (*Client, error) { | ||
| serviceURL := fmt.Sprintf("https://%s.blob.core.windows.net/", storageAccount) | ||
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| client, err := azblob.NewClient(serviceURL, creds, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to init Azure blob client: %w", err) | ||
| } | ||
|
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| svcClient, err := azservice.NewClient(serviceURL, creds, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to init Azure blob service client: %w", err) | ||
| } | ||
|
|
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| return &Client{ | ||
| storageAccount: storageAccount, | ||
| now: func() time.Time { return time.Now().UTC() }, | ||
|
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| client: client, | ||
| svcClient: svcClient, | ||
|
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| cachedUDCMu: &sync.Mutex{}, | ||
| }, nil | ||
| } | ||
|
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| func (c *Client) Scheme() blob.Scheme { | ||
| return Scheme | ||
| } | ||
|
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| func (c *Client) WriteBlob(ctx context.Context, uri string, r io.Reader) error { | ||
| ctr, blb, ok := blob.SplitURI(Scheme, uri) | ||
| if !ok { | ||
| return fmt.Errorf("malformed URI %q is not for Azure", uri) | ||
| } | ||
|
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| if _, err := c.client.UploadStream(ctx, ctr, blb, r, nil); err != nil { | ||
| return fmt.Errorf("failed to upload blob: %w", err) | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (c *Client) ReadBlob(ctx context.Context, uri string) (io.ReadCloser, error) { | ||
| ctr, blb, ok := blob.SplitURI(Scheme, uri) | ||
| if !ok { | ||
| return nil, fmt.Errorf("malformed URI %q is not for Azure", uri) | ||
| } | ||
|
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| resp, err := c.client.DownloadStream(ctx, ctr, blb, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to read blob: %w", err) | ||
| } | ||
|
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| return resp.Body, nil | ||
| } | ||
|
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| // SignedUploadURL returns a URL that is allowed to upload to the given URI. | ||
| // See https://pkg.go.dev/github.com/Azure/azure-sdk-for-go/sdk/storage/[email protected]/sas#example-package-UserDelegationSAS | ||
| func (c *Client) SignedUploadURL(ctx context.Context, uri string) (string, error) { | ||
| return c.signBlob(ctx, uri, &sas.BlobPermissions{Create: true, Write: true}) | ||
| } | ||
|
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| // SignedDownloadURL returns a URL that is allowed to download the file at the given URI. | ||
| // See https://pkg.go.dev/github.com/Azure/azure-sdk-for-go/sdk/storage/[email protected]/sas#example-package-UserDelegationSAS | ||
| func (c *Client) SignedDownloadURL(ctx context.Context, uri string) (string, error) { | ||
| return c.signBlob(ctx, uri, &sas.BlobPermissions{Read: true}) | ||
| } | ||
|
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| func (c *Client) signBlob(ctx context.Context, uri string, perms *sas.BlobPermissions) (string, error) { | ||
| ctr, blb, ok := blob.SplitURI(Scheme, uri) | ||
| if !ok { | ||
| return "", fmt.Errorf("malformed URI %q is not for Azure", uri) | ||
| } | ||
|
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| // The blob component is important, otherwise the signed URL is applicable to the whole container. | ||
| if blb == "" { | ||
| return "", fmt.Errorf("uri %q did not contain a blob component", uri) | ||
| } | ||
|
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| now := c.now().UTC().Add(-10 * time.Second) | ||
| udc, err := c.getUserDelegationCredential(ctx, now) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to get udc: %w", err) | ||
| } | ||
|
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| // Create Blob Signature Values with desired permissions and sign with user delegation credential | ||
| sasQueryParams, err := sas.BlobSignatureValues{ | ||
| Protocol: sas.ProtocolHTTPS, | ||
| StartTime: now, | ||
| ExpiryTime: now.Add(15 * time.Minute), | ||
| Permissions: perms.String(), | ||
| ContainerName: ctr, | ||
| BlobName: blb, | ||
| }.SignWithUserDelegation(udc) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to sign blob: %w", err) | ||
| } | ||
|
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| return fmt.Sprintf("https://%s.blob.core.windows.net/%s/%s?%s", c.storageAccount, ctr, blb, sasQueryParams.Encode()), nil | ||
| } | ||
|
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| func (c *Client) ListBlobs(ctx context.Context, uriPrefix string) ([]string, error) { | ||
| ctr, blobPrefix, ok := blob.SplitURI(Scheme, uriPrefix) | ||
| if !ok { | ||
| return nil, fmt.Errorf("malformed URI prefix %q is not for Azure", uriPrefix) | ||
| } | ||
|
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| if blobPrefix == "" { | ||
| return nil, fmt.Errorf("uri prefix %q did not contain a blob component", uriPrefix) | ||
| } | ||
|
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| pager := c.client.NewListBlobsFlatPager(ctr, &azblob.ListBlobsFlatOptions{ | ||
| Prefix: &blobPrefix, | ||
| }) | ||
|
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| var blobs []string | ||
| for pager.More() { | ||
| resp, err := pager.NextPage(ctx) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to load page of blobs: %w", err) | ||
| } | ||
| for _, bi := range resp.Segment.BlobItems { | ||
| blobs = append(blobs, blob.Join(Scheme, ctr, *bi.Name)) | ||
| } | ||
| } | ||
|
|
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| return blobs, nil | ||
| } | ||
|
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| func (c *Client) getUserDelegationCredential(ctx context.Context, now time.Time) (*azservice.UserDelegationCredential, error) { | ||
| c.cachedUDCMu.Lock() | ||
| defer c.cachedUDCMu.Unlock() | ||
|
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| expiry := now.Add(48 * time.Hour) | ||
| info := azservice.KeyInfo{ | ||
| Start: to.Ptr(now.UTC().Format(sas.TimeFormat)), | ||
| Expiry: to.Ptr(expiry.UTC().Format(sas.TimeFormat)), | ||
| } | ||
|
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| if !c.cachedUDCExpiry.IsZero() && c.cachedUDCExpiry.Sub(now) > 1*time.Minute { | ||
| return c.cachedUDC, nil | ||
| } | ||
|
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| udc, err := c.svcClient.GetUserDelegationCredential(ctx, info, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to get delegated credentials: %w", err) | ||
| } | ||
| c.cachedUDC = udc | ||
| c.cachedUDCExpiry = expiry | ||
|
|
||
| return udc, nil | ||
| } |
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