//go:build !plan9 && !solaris && !js // Package azureblob provides an interface to the Microsoft Azure blob object storage system package azureblob import ( "context" "crypto/md5" "encoding/base64" "encoding/binary" "encoding/hex" "encoding/json" "errors" "fmt" "io" "net/http" "net/url" "os" "path" "sort" "strconv" "strings" "sync" "time" "github.com/Azure/azure-sdk-for-go/sdk/azcore" "github.com/Azure/azure-sdk-for-go/sdk/azcore/policy" "github.com/Azure/azure-sdk-for-go/sdk/azidentity" "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blob" "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/bloberror" "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/blockblob" "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/container" "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/sas" "github.com/Azure/azure-sdk-for-go/sdk/storage/azblob/service" "github.com/rclone/rclone/fs" "github.com/rclone/rclone/fs/chunksize" "github.com/rclone/rclone/fs/config" "github.com/rclone/rclone/fs/config/configmap" "github.com/rclone/rclone/fs/config/configstruct" "github.com/rclone/rclone/fs/config/obscure" "github.com/rclone/rclone/fs/fserrors" "github.com/rclone/rclone/fs/fshttp" "github.com/rclone/rclone/fs/hash" "github.com/rclone/rclone/fs/walk" "github.com/rclone/rclone/lib/bucket" "github.com/rclone/rclone/lib/encoder" "github.com/rclone/rclone/lib/env" "github.com/rclone/rclone/lib/multipart" "github.com/rclone/rclone/lib/pacer" ) const ( minSleep = 10 * time.Millisecond maxSleep = 10 * time.Second decayConstant = 1 // bigger for slower decay, exponential maxListChunkSize = 5000 // number of items to read at once modTimeKey = "mtime" dirMetaKey = "hdi_isfolder" dirMetaValue = "true" timeFormatIn = time.RFC3339 timeFormatOut = "2006-01-02T15:04:05.000000000Z07:00" storageDefaultBaseURL = "blob.core.windows.net" defaultChunkSize = 4 * fs.Mebi defaultAccessTier = blob.AccessTier("") // FIXME AccessTierNone // Default storage account, key and blob endpoint for emulator support, // though it is a base64 key checked in here, it is publicly available secret. emulatorAccount = "devstoreaccount1" emulatorAccountKey = "Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==" emulatorBlobEndpoint = "http://127.0.0.1:10000/devstoreaccount1" ) var ( errCantUpdateArchiveTierBlobs = fserrors.NoRetryError(errors.New("can't update archive tier blob without --azureblob-archive-tier-delete")) // Take this when changing or reading metadata. // // It acts as global metadata lock so we don't bloat Object // with an extra lock that will only very rarely be contended. metadataMu sync.Mutex ) // Register with Fs func init() { fs.Register(&fs.RegInfo{ Name: "azureblob", Description: "Microsoft Azure Blob Storage", NewFs: NewFs, Options: []fs.Option{{ Name: "account", Help: `Azure Storage Account Name. Set this to the Azure Storage Account Name in use. Leave blank to use SAS URL or Emulator, otherwise it needs to be set. If this is blank and if env_auth is set it will be read from the environment variable ` + "`AZURE_STORAGE_ACCOUNT_NAME`" + ` if possible. `, Sensitive: true, }, { Name: "env_auth", Help: `Read credentials from runtime (environment variables, CLI or MSI). See the [authentication docs](/azureblob#authentication) for full info.`, Default: false, }, { Name: "key", Help: `Storage Account Shared Key. Leave blank to use SAS URL or Emulator.`, Sensitive: true, }, { Name: "sas_url", Help: `SAS URL for container level access only. Leave blank if using account/key or Emulator.`, Sensitive: true, }, { Name: "tenant", Help: `ID of the service principal's tenant. Also called its directory ID. Set this if using - Service principal with client secret - Service principal with certificate - User with username and password `, Sensitive: true, }, { Name: "client_id", Help: `The ID of the client in use. Set this if using - Service principal with client secret - Service principal with certificate - User with username and password `, Sensitive: true, }, { Name: "client_secret", Help: `One of the service principal's client secrets Set this if using - Service principal with client secret `, Sensitive: true, }, { Name: "client_certificate_path", Help: `Path to a PEM or PKCS12 certificate file including the private key. Set this if using - Service principal with certificate `, }, { Name: "client_certificate_password", Help: `Password for the certificate file (optional). Optionally set this if using - Service principal with certificate And the certificate has a password. `, IsPassword: true, }, { Name: "client_send_certificate_chain", Help: `Send the certificate chain when using certificate auth. Specifies whether an authentication request will include an x5c header to support subject name / issuer based authentication. When set to true, authentication requests include the x5c header. Optionally set this if using - Service principal with certificate `, Default: false, Advanced: true, }, { Name: "username", Help: `User name (usually an email address) Set this if using - User with username and password `, Advanced: true, Sensitive: true, }, { Name: "password", Help: `The user's password Set this if using - User with username and password `, IsPassword: true, Advanced: true, }, { Name: "service_principal_file", Help: `Path to file containing credentials for use with a service principal. Leave blank normally. Needed only if you want to use a service principal instead of interactive login. $ az ad sp create-for-rbac --name "" \ --role "Storage Blob Data Owner" \ --scopes "/subscriptions//resourceGroups//providers/Microsoft.Storage/storageAccounts//blobServices/default/containers/" \ > azure-principal.json See ["Create an Azure service principal"](https://docs.microsoft.com/en-us/cli/azure/create-an-azure-service-principal-azure-cli) and ["Assign an Azure role for access to blob data"](https://docs.microsoft.com/en-us/azure/storage/common/storage-auth-aad-rbac-cli) pages for more details. It may be more convenient to put the credentials directly into the rclone config file under the ` + "`client_id`, `tenant` and `client_secret`" + ` keys instead of setting ` + "`service_principal_file`" + `. `, Advanced: true, }, { Name: "disable_instance_discovery", Help: `Skip requesting Microsoft Entra instance metadata This should be set true only by applications authenticating in disconnected clouds, or private clouds such as Azure Stack. It determines whether rclone requests Microsoft Entra instance metadata from ` + "`https://login.microsoft.com/`" + ` before authenticating. Setting this to true will skip this request, making you responsible for ensuring the configured authority is valid and trustworthy. `, Default: false, Advanced: true, }, { Name: "use_msi", Help: `Use a managed service identity to authenticate (only works in Azure). When true, use a [managed service identity](https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/) to authenticate to Azure Storage instead of a SAS token or account key. If the VM(SS) on which this program is running has a system-assigned identity, it will be used by default. If the resource has no system-assigned but exactly one user-assigned identity, the user-assigned identity will be used by default. If the resource has multiple user-assigned identities, the identity to use must be explicitly specified using exactly one of the msi_object_id, msi_client_id, or msi_mi_res_id parameters.`, Default: false, Advanced: true, }, { Name: "msi_object_id", Help: "Object ID of the user-assigned MSI to use, if any.\n\nLeave blank if msi_client_id or msi_mi_res_id specified.", Advanced: true, Sensitive: true, }, { Name: "msi_client_id", Help: "Object ID of the user-assigned MSI to use, if any.\n\nLeave blank if msi_object_id or msi_mi_res_id specified.", Advanced: true, Sensitive: true, }, { Name: "msi_mi_res_id", Help: "Azure resource ID of the user-assigned MSI to use, if any.\n\nLeave blank if msi_client_id or msi_object_id specified.", Advanced: true, Sensitive: true, }, { Name: "use_emulator", Help: "Uses local storage emulator if provided as 'true'.\n\nLeave blank if using real azure storage endpoint.", Default: false, Advanced: true, }, { Name: "endpoint", Help: "Endpoint for the service.\n\nLeave blank normally.", Advanced: true, }, { Name: "upload_cutoff", Help: "Cutoff for switching to chunked upload (<= 256 MiB) (deprecated).", Advanced: true, }, { Name: "chunk_size", Help: `Upload chunk size. Note that this is stored in memory and there may be up to "--transfers" * "--azureblob-upload-concurrency" chunks stored at once in memory.`, Default: defaultChunkSize, Advanced: true, }, { Name: "upload_concurrency", Help: `Concurrency for multipart uploads. This is the number of chunks of the same file that are uploaded concurrently. If you are uploading small numbers of large files over high-speed links and these uploads do not fully utilize your bandwidth, then increasing this may help to speed up the transfers. In tests, upload speed increases almost linearly with upload concurrency. For example to fill a gigabit pipe it may be necessary to raise this to 64. Note that this will use more memory. Note that chunks are stored in memory and there may be up to "--transfers" * "--azureblob-upload-concurrency" chunks stored at once in memory.`, Default: 16, Advanced: true, }, { Name: "list_chunk", Help: `Size of blob list. This sets the number of blobs requested in each listing chunk. Default is the maximum, 5000. "List blobs" requests are permitted 2 minutes per megabyte to complete. If an operation is taking longer than 2 minutes per megabyte on average, it will time out ( [source](https://docs.microsoft.com/en-us/rest/api/storageservices/setting-timeouts-for-blob-service-operations#exceptions-to-default-timeout-interval) ). This can be used to limit the number of blobs items to return, to avoid the time out.`, Default: maxListChunkSize, Advanced: true, }, { Name: "access_tier", Help: `Access tier of blob: hot, cool, cold or archive. Archived blobs can be restored by setting access tier to hot, cool or cold. Leave blank if you intend to use default access tier, which is set at account level If there is no "access tier" specified, rclone doesn't apply any tier. rclone performs "Set Tier" operation on blobs while uploading, if objects are not modified, specifying "access tier" to new one will have no effect. If blobs are in "archive tier" at remote, trying to perform data transfer operations from remote will not be allowed. User should first restore by tiering blob to "Hot", "Cool" or "Cold".`, Advanced: true, }, { Name: "archive_tier_delete", Default: false, Help: fmt.Sprintf(`Delete archive tier blobs before overwriting. Archive tier blobs cannot be updated. So without this flag, if you attempt to update an archive tier blob, then rclone will produce the error: %v With this flag set then before rclone attempts to overwrite an archive tier blob, it will delete the existing blob before uploading its replacement. This has the potential for data loss if the upload fails (unlike updating a normal blob) and also may cost more since deleting archive tier blobs early may be chargable. `, errCantUpdateArchiveTierBlobs), Advanced: true, }, { Name: "disable_checksum", Help: `Don't store MD5 checksum with object metadata. Normally rclone will calculate the MD5 checksum of the input before uploading it so it can add it to metadata on the object. This is great for data integrity checking but can cause long delays for large files to start uploading.`, Default: false, Advanced: true, }, { Name: "memory_pool_flush_time", Default: fs.Duration(time.Minute), Advanced: true, Hide: fs.OptionHideBoth, Help: `How often internal memory buffer pools will be flushed. (no longer used)`, }, { Name: "memory_pool_use_mmap", Default: false, Advanced: true, Hide: fs.OptionHideBoth, Help: `Whether to use mmap buffers in internal memory pool. (no longer used)`, }, { Name: config.ConfigEncoding, Help: config.ConfigEncodingHelp, Advanced: true, Default: (encoder.EncodeInvalidUtf8 | encoder.EncodeSlash | encoder.EncodeCtl | encoder.EncodeDel | encoder.EncodeBackSlash | encoder.EncodeRightPeriod), }, { Name: "public_access", Help: "Public access level of a container: blob or container.", Default: "", Examples: []fs.OptionExample{ { Value: "", Help: "The container and its blobs can be accessed only with an authorized request.\nIt's a default value.", }, { Value: string(container.PublicAccessTypeBlob), Help: "Blob data within this container can be read via anonymous request.", }, { Value: string(container.PublicAccessTypeContainer), Help: "Allow full public read access for container and blob data.", }, }, Advanced: true, }, { Name: "directory_markers", Default: false, Advanced: true, Help: `Upload an empty object with a trailing slash when a new directory is created Empty folders are unsupported for bucket based remotes, this option creates an empty object ending with "/", to persist the folder. This object also has the metadata "` + dirMetaKey + ` = ` + dirMetaValue + `" to conform to the Microsoft standard. `, }, { Name: "no_check_container", Help: `If set, don't attempt to check the container exists or create it. This can be useful when trying to minimise the number of transactions rclone does if you know the container exists already. `, Default: false, Advanced: true, }, { Name: "no_head_object", Help: `If set, do not do HEAD before GET when getting objects.`, Default: false, Advanced: true, }, { Name: "delete_snapshots", Help: `Set to specify how to deal with snapshots on blob deletion.`, Examples: []fs.OptionExample{ { Value: "", Help: "By default, the delete operation fails if a blob has snapshots", }, { Value: string(blob.DeleteSnapshotsOptionTypeInclude), Help: "Specify 'include' to remove the root blob and all its snapshots", }, { Value: string(blob.DeleteSnapshotsOptionTypeOnly), Help: "Specify 'only' to remove only the snapshots but keep the root blob.", }, }, Default: "", Exclusive: true, Advanced: true, }}, }) } // Options defines the configuration for this backend type Options struct { Account string `config:"account"` EnvAuth bool `config:"env_auth"` Key string `config:"key"` SASURL string `config:"sas_url"` Tenant string `config:"tenant"` ClientID string `config:"client_id"` ClientSecret string `config:"client_secret"` ClientCertificatePath string `config:"client_certificate_path"` ClientCertificatePassword string `config:"client_certificate_password"` ClientSendCertificateChain bool `config:"client_send_certificate_chain"` Username string `config:"username"` Password string `config:"password"` ServicePrincipalFile string `config:"service_principal_file"` DisableInstanceDiscovery bool `config:"disable_instance_discovery"` UseMSI bool `config:"use_msi"` MSIObjectID string `config:"msi_object_id"` MSIClientID string `config:"msi_client_id"` MSIResourceID string `config:"msi_mi_res_id"` Endpoint string `config:"endpoint"` ChunkSize fs.SizeSuffix `config:"chunk_size"` UploadConcurrency int `config:"upload_concurrency"` ListChunkSize uint `config:"list_chunk"` AccessTier string `config:"access_tier"` ArchiveTierDelete bool `config:"archive_tier_delete"` UseEmulator bool `config:"use_emulator"` DisableCheckSum bool `config:"disable_checksum"` Enc encoder.MultiEncoder `config:"encoding"` PublicAccess string `config:"public_access"` DirectoryMarkers bool `config:"directory_markers"` NoCheckContainer bool `config:"no_check_container"` NoHeadObject bool `config:"no_head_object"` DeleteSnapshots string `config:"delete_snapshots"` } // Fs represents a remote azure server type Fs struct { name string // name of this remote root string // the path we are working on if any opt Options // parsed config options ci *fs.ConfigInfo // global config features *fs.Features // optional features cntSVCcacheMu sync.Mutex // mutex to protect cntSVCcache cntSVCcache map[string]*container.Client // reference to containerClient per container svc *service.Client // client to access azblob rootContainer string // container part of root (if any) rootDirectory string // directory part of root (if any) isLimited bool // if limited to one container cache *bucket.Cache // cache for container creation status pacer *fs.Pacer // To pace and retry the API calls uploadToken *pacer.TokenDispenser // control concurrency publicAccess container.PublicAccessType // Container Public Access Level } // Object describes an azure object type Object struct { fs *Fs // what this object is part of remote string // The remote path modTime time.Time // The modified time of the object if known md5 string // MD5 hash if known size int64 // Size of the object mimeType string // Content-Type of the object accessTier blob.AccessTier // Blob Access Tier meta map[string]string // blob metadata - take metadataMu when accessing } // ------------------------------------------------------------ // Name of the remote (as passed into NewFs) func (f *Fs) Name() string { return f.name } // Root of the remote (as passed into NewFs) func (f *Fs) Root() string { return f.root } // String converts this Fs to a string func (f *Fs) String() string { if f.rootContainer == "" { return "Azure root" } if f.rootDirectory == "" { return fmt.Sprintf("Azure container %s", f.rootContainer) } return fmt.Sprintf("Azure container %s path %s", f.rootContainer, f.rootDirectory) } // Features returns the optional features of this Fs func (f *Fs) Features() *fs.Features { return f.features } // parsePath parses a remote 'url' func parsePath(path string) (root string) { root = strings.Trim(path, "/") return } // split returns container and containerPath from the rootRelativePath // relative to f.root func (f *Fs) split(rootRelativePath string) (containerName, containerPath string) { containerName, containerPath = bucket.Split(bucket.Join(f.root, rootRelativePath)) return f.opt.Enc.FromStandardName(containerName), f.opt.Enc.FromStandardPath(containerPath) } // split returns container and containerPath from the object func (o *Object) split() (container, containerPath string) { return o.fs.split(o.remote) } // validateAccessTier checks if azureblob supports user supplied tier func validateAccessTier(tier string) bool { return strings.EqualFold(tier, string(blob.AccessTierHot)) || strings.EqualFold(tier, string(blob.AccessTierCool)) || strings.EqualFold(tier, string(blob.AccessTierCold)) || strings.EqualFold(tier, string(blob.AccessTierArchive)) } // validatePublicAccess checks if azureblob supports use supplied public access level func validatePublicAccess(publicAccess string) bool { switch publicAccess { case "", string(container.PublicAccessTypeBlob), string(container.PublicAccessTypeContainer): // valid cases return true default: return false } } // retryErrorCodes is a slice of error codes that we will retry var retryErrorCodes = []int{ 401, // Unauthorized (e.g. "Token has expired") 408, // Request Timeout 429, // Rate exceeded. 500, // Get occasional 500 Internal Server Error 503, // Service Unavailable 504, // Gateway Time-out } // shouldRetry returns a boolean as to whether this resp and err // deserve to be retried. It returns the err as a convenience func (f *Fs) shouldRetry(ctx context.Context, err error) (bool, error) { if fserrors.ContextError(ctx, &err) { return false, err } // FIXME interpret special errors - more to do here if storageErr, ok := err.(*azcore.ResponseError); ok { switch storageErr.ErrorCode { case "InvalidBlobOrBlock": // These errors happen sometimes in multipart uploads // because of block concurrency issues return true, err } statusCode := storageErr.StatusCode for _, e := range retryErrorCodes { if statusCode == e { return true, err } } } return fserrors.ShouldRetry(err), err } func checkUploadChunkSize(cs fs.SizeSuffix) error { const minChunkSize = fs.SizeSuffixBase if cs < minChunkSize { return fmt.Errorf("%s is less than %s", cs, minChunkSize) } return nil } func (f *Fs) setUploadChunkSize(cs fs.SizeSuffix) (old fs.SizeSuffix, err error) { err = checkUploadChunkSize(cs) if err == nil { old, f.opt.ChunkSize = f.opt.ChunkSize, cs } return } type servicePrincipalCredentials struct { AppID string `json:"appId"` Password string `json:"password"` Tenant string `json:"tenant"` } // parseServicePrincipalCredentials unmarshals a service principal credentials JSON file as generated by az cli. func parseServicePrincipalCredentials(ctx context.Context, credentialsData []byte) (*servicePrincipalCredentials, error) { var spCredentials servicePrincipalCredentials if err := json.Unmarshal(credentialsData, &spCredentials); err != nil { return nil, fmt.Errorf("error parsing credentials from JSON file: %w", err) } // TODO: support certificate credentials // Validate all fields present if spCredentials.AppID == "" || spCredentials.Password == "" || spCredentials.Tenant == "" { return nil, fmt.Errorf("missing fields in credentials file") } return &spCredentials, nil } // setRoot changes the root of the Fs func (f *Fs) setRoot(root string) { f.root = parsePath(root) f.rootContainer, f.rootDirectory = bucket.Split(f.root) } // Wrap the http.Transport to satisfy the Transporter interface type transporter struct { http.RoundTripper } // Make a new transporter func newTransporter(ctx context.Context) transporter { return transporter{ RoundTripper: fshttp.NewTransport(ctx), } } // Do sends the HTTP request and returns the HTTP response or error. func (tr transporter) Do(req *http.Request) (*http.Response, error) { return tr.RoundTripper.RoundTrip(req) } // NewFs constructs an Fs from the path, container:path func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, error) { // Parse config into Options struct opt := new(Options) err := configstruct.Set(m, opt) if err != nil { return nil, err } err = checkUploadChunkSize(opt.ChunkSize) if err != nil { return nil, fmt.Errorf("chunk size: %w", err) } if opt.ListChunkSize > maxListChunkSize { return nil, fmt.Errorf("blob list size can't be greater than %v - was %v", maxListChunkSize, opt.ListChunkSize) } if opt.AccessTier == "" { opt.AccessTier = string(defaultAccessTier) } else if !validateAccessTier(opt.AccessTier) { return nil, fmt.Errorf("supported access tiers are %s, %s, %s and %s", string(blob.AccessTierHot), string(blob.AccessTierCool), string(blob.AccessTierCold), string(blob.AccessTierArchive)) } if !validatePublicAccess((opt.PublicAccess)) { return nil, fmt.Errorf("supported public access level are %s and %s", string(container.PublicAccessTypeBlob), string(container.PublicAccessTypeContainer)) } ci := fs.GetConfig(ctx) f := &Fs{ name: name, opt: *opt, ci: ci, pacer: fs.NewPacer(ctx, pacer.NewS3(pacer.MinSleep(minSleep), pacer.MaxSleep(maxSleep), pacer.DecayConstant(decayConstant))), uploadToken: pacer.NewTokenDispenser(ci.Transfers), cache: bucket.NewCache(), cntSVCcache: make(map[string]*container.Client, 1), } f.publicAccess = container.PublicAccessType(opt.PublicAccess) f.setRoot(root) f.features = (&fs.Features{ ReadMimeType: true, WriteMimeType: true, BucketBased: true, BucketBasedRootOK: true, SetTier: true, GetTier: true, }).Fill(ctx, f) if opt.DirectoryMarkers { f.features.CanHaveEmptyDirectories = true fs.Debugf(f, "Using directory markers") } // Client options specifying our own transport policyClientOptions := policy.ClientOptions{ Transport: newTransporter(ctx), } clientOpt := service.ClientOptions{ ClientOptions: policyClientOptions, } // Here we auth by setting one of cred, sharedKeyCred, f.svc or anonymous var ( cred azcore.TokenCredential sharedKeyCred *service.SharedKeyCredential anonymous = false ) switch { case opt.EnvAuth: // Read account from environment if needed if opt.Account == "" { opt.Account, _ = os.LookupEnv("AZURE_STORAGE_ACCOUNT_NAME") } // Read credentials from the environment options := azidentity.DefaultAzureCredentialOptions{ ClientOptions: policyClientOptions, DisableInstanceDiscovery: opt.DisableInstanceDiscovery, } cred, err = azidentity.NewDefaultAzureCredential(&options) if err != nil { return nil, fmt.Errorf("create azure environment credential failed: %w", err) } case opt.UseEmulator: if opt.Account == "" { opt.Account = emulatorAccount } if opt.Key == "" { opt.Key = emulatorAccountKey } if opt.Endpoint == "" { opt.Endpoint = emulatorBlobEndpoint } sharedKeyCred, err = service.NewSharedKeyCredential(opt.Account, opt.Key) if err != nil { return nil, fmt.Errorf("create new shared key credential for emulator failed: %w", err) } case opt.Account != "" && opt.Key != "": sharedKeyCred, err = service.NewSharedKeyCredential(opt.Account, opt.Key) if err != nil { return nil, fmt.Errorf("create new shared key credential failed: %w", err) } case opt.SASURL != "": parts, err := sas.ParseURL(opt.SASURL) if err != nil { return nil, fmt.Errorf("failed to parse SAS URL: %w", err) } endpoint := opt.SASURL containerName := parts.ContainerName // Check if we have container level SAS or account level SAS if containerName != "" { // Container level SAS if f.rootContainer != "" && containerName != f.rootContainer { return nil, fmt.Errorf("container name in SAS URL (%q) and container provided in command (%q) do not match", containerName, f.rootContainer) } // Rewrite the endpoint string to be without the container parts.ContainerName = "" endpoint = parts.String() } f.svc, err = service.NewClientWithNoCredential(endpoint, &clientOpt) if err != nil { return nil, fmt.Errorf("unable to create SAS URL client: %w", err) } // if using Container level SAS put the container client into the cache if containerName != "" { _ = f.cntSVC(containerName) f.isLimited = true } case opt.ClientID != "" && opt.Tenant != "" && opt.ClientSecret != "": // Service principal with client secret options := azidentity.ClientSecretCredentialOptions{ ClientOptions: policyClientOptions, } cred, err = azidentity.NewClientSecretCredential(opt.Tenant, opt.ClientID, opt.ClientSecret, &options) if err != nil { return nil, fmt.Errorf("error creating a client secret credential: %w", err) } case opt.ClientID != "" && opt.Tenant != "" && opt.ClientCertificatePath != "": // Service principal with certificate // // Read the certificate data, err := os.ReadFile(env.ShellExpand(opt.ClientCertificatePath)) if err != nil { return nil, fmt.Errorf("error reading client certificate file: %w", err) } // NewClientCertificateCredential requires at least one *x509.Certificate, and a // crypto.PrivateKey. // // ParseCertificates returns these given certificate data in PEM or PKCS12 format. // It handles common scenarios but has limitations, for example it doesn't load PEM // encrypted private keys. var password []byte if opt.ClientCertificatePassword != "" { pw, err := obscure.Reveal(opt.Password) if err != nil { return nil, fmt.Errorf("certificate password decode failed - did you obscure it?: %w", err) } password = []byte(pw) } certs, key, err := azidentity.ParseCertificates(data, password) if err != nil { return nil, fmt.Errorf("failed to parse client certificate file: %w", err) } options := azidentity.ClientCertificateCredentialOptions{ ClientOptions: policyClientOptions, SendCertificateChain: opt.ClientSendCertificateChain, } cred, err = azidentity.NewClientCertificateCredential( opt.Tenant, opt.ClientID, certs, key, &options, ) if err != nil { return nil, fmt.Errorf("create azure service principal with client certificate credential failed: %w", err) } case opt.ClientID != "" && opt.Tenant != "" && opt.Username != "" && opt.Password != "": // User with username and password options := azidentity.UsernamePasswordCredentialOptions{ ClientOptions: policyClientOptions, } password, err := obscure.Reveal(opt.Password) if err != nil { return nil, fmt.Errorf("user password decode failed - did you obscure it?: %w", err) } cred, err = azidentity.NewUsernamePasswordCredential( opt.Tenant, opt.ClientID, opt.Username, password, &options, ) if err != nil { return nil, fmt.Errorf("authenticate user with password failed: %w", err) } case opt.ServicePrincipalFile != "": // Loading service principal credentials from file. loadedCreds, err := os.ReadFile(env.ShellExpand(opt.ServicePrincipalFile)) if err != nil { return nil, fmt.Errorf("error opening service principal credentials file: %w", err) } parsedCreds, err := parseServicePrincipalCredentials(ctx, loadedCreds) if err != nil { return nil, fmt.Errorf("error parsing service principal credentials file: %w", err) } options := azidentity.ClientSecretCredentialOptions{ ClientOptions: policyClientOptions, } cred, err = azidentity.NewClientSecretCredential(parsedCreds.Tenant, parsedCreds.AppID, parsedCreds.Password, &options) if err != nil { return nil, fmt.Errorf("error creating a client secret credential: %w", err) } case opt.UseMSI: // Specifying a user-assigned identity. Exactly one of the above IDs must be specified. // Validate and ensure exactly one is set. (To do: better validation.) var b2i = map[bool]int{false: 0, true: 1} set := b2i[opt.MSIClientID != ""] + b2i[opt.MSIObjectID != ""] + b2i[opt.MSIResourceID != ""] if set > 1 { return nil, errors.New("more than one user-assigned identity ID is set") } var options azidentity.ManagedIdentityCredentialOptions switch { case opt.MSIClientID != "": options.ID = azidentity.ClientID(opt.MSIClientID) case opt.MSIObjectID != "": // FIXME this doesn't appear to be in the new SDK? return nil, fmt.Errorf("MSI object ID is currently unsupported") case opt.MSIResourceID != "": options.ID = azidentity.ResourceID(opt.MSIResourceID) } cred, err = azidentity.NewManagedIdentityCredential(&options) if err != nil { return nil, fmt.Errorf("failed to acquire MSI token: %w", err) } case opt.Account != "": // Anonymous access anonymous = true default: return nil, errors.New("no authentication method configured") } // Make the client if not already created if f.svc == nil { // Work out what the endpoint is if it is still unset if opt.Endpoint == "" { if opt.Account == "" { return nil, fmt.Errorf("account must be set: can't make service URL") } u, err := url.Parse(fmt.Sprintf("https://%s.%s", opt.Account, storageDefaultBaseURL)) if err != nil { return nil, fmt.Errorf("failed to make azure storage URL from account: %w", err) } opt.Endpoint = u.String() } if sharedKeyCred != nil { // Shared key cred f.svc, err = service.NewClientWithSharedKeyCredential(opt.Endpoint, sharedKeyCred, &clientOpt) if err != nil { return nil, fmt.Errorf("create client with shared key failed: %w", err) } } else if cred != nil { // Azidentity cred f.svc, err = service.NewClient(opt.Endpoint, cred, &clientOpt) if err != nil { return nil, fmt.Errorf("create client failed: %w", err) } } else if anonymous { // Anonymous public access f.svc, err = service.NewClientWithNoCredential(opt.Endpoint, &clientOpt) if err != nil { return nil, fmt.Errorf("create public client failed: %w", err) } } } if f.svc == nil { return nil, fmt.Errorf("internal error: auth failed to make credentials or client") } if f.rootContainer != "" && f.rootDirectory != "" { // Check to see if the (container,directory) is actually an existing file oldRoot := f.root newRoot, leaf := path.Split(oldRoot) f.setRoot(newRoot) _, err := f.NewObject(ctx, leaf) if err != nil { if err == fs.ErrorObjectNotFound || err == fs.ErrorNotAFile { // File doesn't exist or is a directory so return old f f.setRoot(oldRoot) return f, nil } return nil, err } // return an error with an fs which points to the parent return f, fs.ErrorIsFile } return f, nil } // return the container client for the container passed in func (f *Fs) cntSVC(containerName string) (containerClient *container.Client) { f.cntSVCcacheMu.Lock() defer f.cntSVCcacheMu.Unlock() var ok bool if containerClient, ok = f.cntSVCcache[containerName]; !ok { containerClient = f.svc.NewContainerClient(containerName) f.cntSVCcache[containerName] = containerClient } return containerClient } // Return an Object from a path // // If it can't be found it returns the error fs.ErrorObjectNotFound. func (f *Fs) newObjectWithInfo(ctx context.Context, remote string, info *container.BlobItem) (fs.Object, error) { o := &Object{ fs: f, remote: remote, } if info != nil { err := o.decodeMetaDataFromBlob(info) if err != nil { return nil, err } } else if !o.fs.opt.NoHeadObject { err := o.readMetaData(ctx) // reads info and headers, returning an error if err != nil { return nil, err } } return o, nil } // NewObject finds the Object at remote. If it can't be found // it returns the error fs.ErrorObjectNotFound. func (f *Fs) NewObject(ctx context.Context, remote string) (fs.Object, error) { return f.newObjectWithInfo(ctx, remote, nil) } // getBlobSVC creates a blob client func (f *Fs) getBlobSVC(container, containerPath string) *blob.Client { return f.cntSVC(container).NewBlobClient(containerPath) } // getBlockBlobSVC creates a block blob client func (f *Fs) getBlockBlobSVC(container, containerPath string) *blockblob.Client { return f.cntSVC(container).NewBlockBlobClient(containerPath) } // updateMetadataWithModTime adds the modTime passed in to o.meta. func (o *Object) updateMetadataWithModTime(modTime time.Time) { metadataMu.Lock() defer metadataMu.Unlock() // Make sure o.meta is not nil if o.meta == nil { o.meta = make(map[string]string, 1) } // Set modTimeKey in it o.meta[modTimeKey] = modTime.Format(timeFormatOut) } // Returns whether file is a directory marker or not func isDirectoryMarker(size int64, metadata map[string]*string, remote string) bool { // Directory markers are 0 length if size == 0 { endsWithSlash := strings.HasSuffix(remote, "/") if endsWithSlash || remote == "" { return true } // Note that metadata with hdi_isfolder = true seems to be a // defacto standard for marking blobs as directories. // Note also that the metadata hasn't been normalised to lower case yet for k, v := range metadata { if v != nil && strings.EqualFold(k, dirMetaKey) && *v == dirMetaValue { return true } } } return false } // listFn is called from list to handle an object type listFn func(remote string, object *container.BlobItem, isDirectory bool) error // list lists the objects into the function supplied from // the container and root supplied // // dir is the starting directory, "" for root // // The remote has prefix removed from it and if addContainer is set then // it adds the container to the start. func (f *Fs) list(ctx context.Context, containerName, directory, prefix string, addContainer bool, recurse bool, maxResults int32, fn listFn) error { if f.cache.IsDeleted(containerName) { return fs.ErrorDirNotFound } if prefix != "" { prefix += "/" } if directory != "" { directory += "/" } delimiter := "" if !recurse { delimiter = "/" } pager := f.cntSVC(containerName).NewListBlobsHierarchyPager(delimiter, &container.ListBlobsHierarchyOptions{ // Copy, Metadata, Snapshots, UncommittedBlobs, Deleted, Tags, Versions, LegalHold, ImmutabilityPolicy, DeletedWithVersions bool Include: container.ListBlobsInclude{ Copy: false, Metadata: true, Snapshots: false, UncommittedBlobs: false, Deleted: false, }, Prefix: &directory, MaxResults: &maxResults, }) foundItems := 0 for pager.More() { var response container.ListBlobsHierarchyResponse err := f.pacer.Call(func() (bool, error) { var err error response, err = pager.NextPage(ctx) //response, err = f.srv.ListBlobsHierarchySegment(ctx, marker, delimiter, options) return f.shouldRetry(ctx, err) }) if err != nil { // Check http error code along with service code, current SDK doesn't populate service code correctly sometimes if storageErr, ok := err.(*azcore.ResponseError); ok && (storageErr.ErrorCode == string(bloberror.ContainerNotFound) || storageErr.StatusCode == http.StatusNotFound) { return fs.ErrorDirNotFound } return err } // Advance marker to next // marker = response.NextMarker foundItems += len(response.Segment.BlobItems) for i := range response.Segment.BlobItems { file := response.Segment.BlobItems[i] // Finish if file name no longer has prefix // if prefix != "" && !strings.HasPrefix(file.Name, prefix) { // return nil // } if file.Name == nil { fs.Debugf(f, "Nil name received") continue } remote := f.opt.Enc.ToStandardPath(*file.Name) if !strings.HasPrefix(remote, prefix) { fs.Debugf(f, "Odd name received %q", remote) continue } isDirectory := isDirectoryMarker(*file.Properties.ContentLength, file.Metadata, remote) if isDirectory { // Don't insert the root directory if remote == f.opt.Enc.ToStandardPath(directory) { continue } // process directory markers as directories remote = strings.TrimRight(remote, "/") } remote = remote[len(prefix):] if addContainer { remote = path.Join(containerName, remote) } // Send object err = fn(remote, file, isDirectory) if err != nil { return err } } // Send the subdirectories foundItems += len(response.Segment.BlobPrefixes) for _, remote := range response.Segment.BlobPrefixes { if remote.Name == nil { fs.Debugf(f, "Nil prefix received") continue } remote := strings.TrimRight(*remote.Name, "/") remote = f.opt.Enc.ToStandardPath(remote) if !strings.HasPrefix(remote, prefix) { fs.Debugf(f, "Odd directory name received %q", remote) continue } remote = remote[len(prefix):] if addContainer { remote = path.Join(containerName, remote) } // Send object err = fn(remote, nil, true) if err != nil { return err } } } if f.opt.DirectoryMarkers && foundItems == 0 && directory != "" { // Determine whether the directory exists or not by whether it has a marker _, err := f.readMetaData(ctx, containerName, directory) if err != nil { if err == fs.ErrorObjectNotFound { return fs.ErrorDirNotFound } return err } } return nil } // Convert a list item into a DirEntry func (f *Fs) itemToDirEntry(ctx context.Context, remote string, object *container.BlobItem, isDirectory bool) (fs.DirEntry, error) { if isDirectory { d := fs.NewDir(remote, time.Time{}) return d, nil } o, err := f.newObjectWithInfo(ctx, remote, object) if err != nil { return nil, err } return o, nil } // Check to see if this is a limited container and the container is not found func (f *Fs) containerOK(container string) bool { if !f.isLimited { return true } f.cntSVCcacheMu.Lock() defer f.cntSVCcacheMu.Unlock() for limitedContainer := range f.cntSVCcache { if container == limitedContainer { return true } } return false } // listDir lists a single directory func (f *Fs) listDir(ctx context.Context, containerName, directory, prefix string, addContainer bool) (entries fs.DirEntries, err error) { if !f.containerOK(containerName) { return nil, fs.ErrorDirNotFound } err = f.list(ctx, containerName, directory, prefix, addContainer, false, int32(f.opt.ListChunkSize), func(remote string, object *container.BlobItem, isDirectory bool) error { entry, err := f.itemToDirEntry(ctx, remote, object, isDirectory) if err != nil { return err } if entry != nil { entries = append(entries, entry) } return nil }) if err != nil { return nil, err } // container must be present if listing succeeded f.cache.MarkOK(containerName) return entries, nil } // listContainers returns all the containers to out func (f *Fs) listContainers(ctx context.Context) (entries fs.DirEntries, err error) { if f.isLimited { f.cntSVCcacheMu.Lock() for container := range f.cntSVCcache { d := fs.NewDir(container, time.Time{}) entries = append(entries, d) } f.cntSVCcacheMu.Unlock() return entries, nil } err = f.listContainersToFn(func(Name string, LastModified time.Time) error { d := fs.NewDir(f.opt.Enc.ToStandardName(Name), LastModified) f.cache.MarkOK(Name) entries = append(entries, d) return nil }) if err != nil { return nil, err } return entries, nil } // List the objects and directories in dir into entries. The // entries can be returned in any order but should be for a // complete directory. // // dir should be "" to list the root, and should not have // trailing slashes. // // This should return ErrDirNotFound if the directory isn't // found. func (f *Fs) List(ctx context.Context, dir string) (entries fs.DirEntries, err error) { container, directory := f.split(dir) if container == "" { if directory != "" { return nil, fs.ErrorListBucketRequired } return f.listContainers(ctx) } return f.listDir(ctx, container, directory, f.rootDirectory, f.rootContainer == "") } // ListR lists the objects and directories of the Fs starting // from dir recursively into out. // // dir should be "" to start from the root, and should not // have trailing slashes. // // This should return ErrDirNotFound if the directory isn't // found. // // It should call callback for each tranche of entries read. // These need not be returned in any particular order. If // callback returns an error then the listing will stop // immediately. // // Don't implement this unless you have a more efficient way // of listing recursively that doing a directory traversal. func (f *Fs) ListR(ctx context.Context, dir string, callback fs.ListRCallback) (err error) { containerName, directory := f.split(dir) list := walk.NewListRHelper(callback) listR := func(containerName, directory, prefix string, addContainer bool) error { return f.list(ctx, containerName, directory, prefix, addContainer, true, int32(f.opt.ListChunkSize), func(remote string, object *container.BlobItem, isDirectory bool) error { entry, err := f.itemToDirEntry(ctx, remote, object, isDirectory) if err != nil { return err } return list.Add(entry) }) } if containerName == "" { entries, err := f.listContainers(ctx) if err != nil { return err } for _, entry := range entries { err = list.Add(entry) if err != nil { return err } container := entry.Remote() err = listR(container, "", f.rootDirectory, true) if err != nil { return err } // container must be present if listing succeeded f.cache.MarkOK(container) } } else { if !f.containerOK(containerName) { return fs.ErrorDirNotFound } err = listR(containerName, directory, f.rootDirectory, f.rootContainer == "") if err != nil { return err } // container must be present if listing succeeded f.cache.MarkOK(containerName) } return list.Flush() } // listContainerFn is called from listContainersToFn to handle a container type listContainerFn func(Name string, LastModified time.Time) error // listContainersToFn lists the containers to the function supplied func (f *Fs) listContainersToFn(fn listContainerFn) error { max := int32(f.opt.ListChunkSize) pager := f.svc.NewListContainersPager(&service.ListContainersOptions{ Include: service.ListContainersInclude{Metadata: true, Deleted: true}, MaxResults: &max, }) ctx := context.Background() for pager.More() { var response service.ListContainersResponse err := f.pacer.Call(func() (bool, error) { var err error response, err = pager.NextPage(ctx) return f.shouldRetry(ctx, err) }) if err != nil { return err } for _, cnt := range response.ContainerItems { if cnt == nil || cnt.Name == nil || cnt.Properties == nil || cnt.Properties.LastModified == nil { fs.Debugf(f, "nil returned in container info") } err = fn(*cnt.Name, *cnt.Properties.LastModified) if err != nil { return err } } } return nil } // Put the object into the container // // Copy the reader in to the new object which is returned. // // The new object may have been created if an error is returned func (f *Fs) Put(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.Object, error) { // Temporary Object under construction fs := &Object{ fs: f, remote: src.Remote(), } return fs, fs.Update(ctx, in, src, options...) } // PutStream uploads to the remote path with the modTime given of indeterminate size func (f *Fs) PutStream(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.Object, error) { return f.Put(ctx, in, src, options...) } // Create directory marker file and parents func (f *Fs) createDirectoryMarker(ctx context.Context, container, dir string) error { if !f.opt.DirectoryMarkers || container == "" { return nil } // Object to be uploaded o := &Object{ fs: f, modTime: time.Now(), meta: map[string]string{ dirMetaKey: dirMetaValue, }, } for { _, containerPath := f.split(dir) // Don't create the directory marker if it is the bucket or at the very root if containerPath == "" { break } o.remote = dir + "/" // Check to see if object already exists _, err := f.readMetaData(ctx, container, containerPath+"/") if err == nil { return nil } // Upload it if not fs.Debugf(o, "Creating directory marker") content := io.Reader(strings.NewReader("")) err = o.Update(ctx, content, o) if err != nil { return fmt.Errorf("creating directory marker failed: %w", err) } // Now check parent directory exists dir = path.Dir(dir) if dir == "/" || dir == "." { break } } return nil } // Mkdir creates the container if it doesn't exist func (f *Fs) Mkdir(ctx context.Context, dir string) error { container, _ := f.split(dir) e := f.makeContainer(ctx, container) if e != nil { return e } return f.createDirectoryMarker(ctx, container, dir) } // mkdirParent creates the parent bucket/directory if it doesn't exist func (f *Fs) mkdirParent(ctx context.Context, remote string) error { remote = strings.TrimRight(remote, "/") dir := path.Dir(remote) if dir == "/" || dir == "." { dir = "" } return f.Mkdir(ctx, dir) } // makeContainer creates the container if it doesn't exist func (f *Fs) makeContainer(ctx context.Context, container string) error { if f.opt.NoCheckContainer { return nil } return f.cache.Create(container, func() error { // If this is a SAS URL limited to a container then assume it is already created if f.isLimited { return nil } opt := service.CreateContainerOptions{ // Optional. Specifies a user-defined name-value pair associated with the blob. //Metadata map[string]string // Optional. Specifies the encryption scope settings to set on the container. //CpkScopeInfo *CpkScopeInfo } if f.publicAccess != "" { // Specifies whether data in the container may be accessed publicly and the level of access opt.Access = &f.publicAccess } // now try to create the container return f.pacer.Call(func() (bool, error) { _, err := f.svc.CreateContainer(ctx, container, &opt) if err != nil { if storageErr, ok := err.(*azcore.ResponseError); ok { switch bloberror.Code(storageErr.ErrorCode) { case bloberror.ContainerAlreadyExists: return false, nil case bloberror.ContainerBeingDeleted: // From https://docs.microsoft.com/en-us/rest/api/storageservices/delete-container // When a container is deleted, a container with the same name cannot be created // for at least 30 seconds; the container may not be available for more than 30 // seconds if the service is still processing the request. time.Sleep(6 * time.Second) // default 10 retries will be 60 seconds f.cache.MarkDeleted(container) return true, err case bloberror.AuthorizationFailure: // Assume that the user does not have permission to // create the container and carry on anyway. fs.Debugf(f, "Tried to create container but got %s error - carrying on assuming container exists. Use no_check_container to stop this check..", storageErr.ErrorCode) return false, nil } } } return f.shouldRetry(ctx, err) }) }, nil) } // isEmpty checks to see if a given (container, directory) is empty and returns an error if not func (f *Fs) isEmpty(ctx context.Context, containerName, directory string) (err error) { empty := true err = f.list(ctx, containerName, directory, f.rootDirectory, f.rootContainer == "", true, 1, func(remote string, object *container.BlobItem, isDirectory bool) error { empty = false return nil }) if err != nil { return err } if !empty { return fs.ErrorDirectoryNotEmpty } return nil } // deleteContainer deletes the container. It can delete a full // container so use isEmpty if you don't want that. func (f *Fs) deleteContainer(ctx context.Context, containerName string) error { return f.cache.Remove(containerName, func() error { getOptions := container.GetPropertiesOptions{} delOptions := container.DeleteOptions{} return f.pacer.Call(func() (bool, error) { _, err := f.cntSVC(containerName).GetProperties(ctx, &getOptions) if err == nil { _, err = f.cntSVC(containerName).Delete(ctx, &delOptions) } if err != nil { // Check http error code along with service code, current SDK doesn't populate service code correctly sometimes if storageErr, ok := err.(*azcore.ResponseError); ok && (storageErr.ErrorCode == string(bloberror.ContainerNotFound) || storageErr.StatusCode == http.StatusNotFound) { return false, fs.ErrorDirNotFound } return f.shouldRetry(ctx, err) } return f.shouldRetry(ctx, err) }) }) } // Rmdir deletes the container if the fs is at the root // // Returns an error if it isn't empty func (f *Fs) Rmdir(ctx context.Context, dir string) error { container, directory := f.split(dir) // Remove directory marker file if f.opt.DirectoryMarkers && container != "" && directory != "" { o := &Object{ fs: f, remote: dir + "/", } fs.Debugf(o, "Removing directory marker") err := o.Remove(ctx) if err != nil { return fmt.Errorf("removing directory marker failed: %w", err) } } if container == "" || directory != "" { return nil } err := f.isEmpty(ctx, container, directory) if err != nil { return err } return f.deleteContainer(ctx, container) } // Precision of the remote func (f *Fs) Precision() time.Duration { return time.Nanosecond } // Hashes returns the supported hash sets. func (f *Fs) Hashes() hash.Set { return hash.Set(hash.MD5) } // Purge deletes all the files and directories including the old versions. func (f *Fs) Purge(ctx context.Context, dir string) error { container, directory := f.split(dir) if container == "" { return errors.New("can't purge from root") } if directory != "" { // Delegate to caller if not root of a container return fs.ErrorCantPurge } return f.deleteContainer(ctx, container) } // Copy src to this remote using server-side copy operations. // // This is stored with the remote path given. // // It returns the destination Object and a possible error. // // Will only be called if src.Fs().Name() == f.Name() // // If it isn't possible then return fs.ErrorCantCopy func (f *Fs) Copy(ctx context.Context, src fs.Object, remote string) (fs.Object, error) { dstContainer, dstPath := f.split(remote) err := f.mkdirParent(ctx, remote) if err != nil { return nil, err } srcObj, ok := src.(*Object) if !ok { fs.Debugf(src, "Can't copy - not same remote type") return nil, fs.ErrorCantCopy } dstBlobSVC := f.getBlobSVC(dstContainer, dstPath) srcBlobSVC := srcObj.getBlobSVC() srcURL := srcBlobSVC.URL() options := blob.StartCopyFromURLOptions{ Tier: parseTier(f.opt.AccessTier), } var startCopy blob.StartCopyFromURLResponse err = f.pacer.Call(func() (bool, error) { startCopy, err = dstBlobSVC.StartCopyFromURL(ctx, srcURL, &options) return f.shouldRetry(ctx, err) }) if err != nil { return nil, err } copyStatus := startCopy.CopyStatus getOptions := blob.GetPropertiesOptions{} for copyStatus != nil && string(*copyStatus) == string(container.CopyStatusTypePending) { time.Sleep(1 * time.Second) getMetadata, err := dstBlobSVC.GetProperties(ctx, &getOptions) if err != nil { return nil, err } copyStatus = getMetadata.CopyStatus } return f.NewObject(ctx, remote) } // ------------------------------------------------------------ // Fs returns the parent Fs func (o *Object) Fs() fs.Info { return o.fs } // Return a string version func (o *Object) String() string { if o == nil { return "" } return o.remote } // Remote returns the remote path func (o *Object) Remote() string { return o.remote } // Hash returns the MD5 of an object returning a lowercase hex string func (o *Object) Hash(ctx context.Context, t hash.Type) (string, error) { if t != hash.MD5 { return "", hash.ErrUnsupported } // Convert base64 encoded md5 into lower case hex if o.md5 == "" { return "", nil } data, err := base64.StdEncoding.DecodeString(o.md5) if err != nil { return "", fmt.Errorf("failed to decode Content-MD5: %q: %w", o.md5, err) } return hex.EncodeToString(data), nil } // Size returns the size of an object in bytes func (o *Object) Size() int64 { return o.size } // Set o.metadata from metadata func (o *Object) setMetadata(metadata map[string]*string) { metadataMu.Lock() defer metadataMu.Unlock() if len(metadata) > 0 { // Lower case the metadata o.meta = make(map[string]string, len(metadata)) for k, v := range metadata { if v != nil { o.meta[strings.ToLower(k)] = *v } } // Set o.modTime from metadata if it exists and // UseServerModTime isn't in use. if modTime, ok := o.meta[modTimeKey]; !o.fs.ci.UseServerModTime && ok { when, err := time.Parse(timeFormatIn, modTime) if err != nil { fs.Debugf(o, "Couldn't parse %v = %q: %v", modTimeKey, modTime, err) } o.modTime = when } } else { o.meta = nil } } // Get metadata from o.meta func (o *Object) getMetadata() (metadata map[string]*string) { metadataMu.Lock() defer metadataMu.Unlock() if len(o.meta) == 0 { return nil } metadata = make(map[string]*string, len(o.meta)) for k, v := range o.meta { v := v metadata[k] = &v } return metadata } // decodeMetaDataFromPropertiesResponse sets the metadata from the data passed in // // Sets // // o.id // o.modTime // o.size // o.md5 // o.meta func (o *Object) decodeMetaDataFromPropertiesResponse(info *blob.GetPropertiesResponse) (err error) { metadata := info.Metadata var size int64 if info.ContentLength == nil { size = -1 } else { size = *info.ContentLength } if isDirectoryMarker(size, metadata, o.remote) { return fs.ErrorNotAFile } // NOTE - Client library always returns MD5 as base64 decoded string, Object needs to maintain // this as base64 encoded string. o.md5 = base64.StdEncoding.EncodeToString(info.ContentMD5) if info.ContentType == nil { o.mimeType = "" } else { o.mimeType = *info.ContentType } o.size = size if info.LastModified == nil { o.modTime = time.Now() } else { o.modTime = *info.LastModified } if info.AccessTier == nil { o.accessTier = blob.AccessTier("") } else { o.accessTier = blob.AccessTier(*info.AccessTier) } o.setMetadata(metadata) return nil } func (o *Object) decodeMetaDataFromDownloadResponse(info *blob.DownloadStreamResponse) (err error) { metadata := info.Metadata var size int64 if info.ContentLength == nil { size = -1 } else { size = *info.ContentLength } if isDirectoryMarker(size, metadata, o.remote) { return fs.ErrorNotAFile } // NOTE - Client library always returns MD5 as base64 decoded string, Object needs to maintain // this as base64 encoded string. o.md5 = base64.StdEncoding.EncodeToString(info.ContentMD5) if info.ContentType == nil { o.mimeType = "" } else { o.mimeType = *info.ContentType } o.size = size if info.LastModified == nil { o.modTime = time.Now() } else { o.modTime = *info.LastModified } // FIXME response doesn't appear to have AccessTier in? // if info.AccessTier == nil { // o.accessTier = blob.AccessTier("") // } else { // o.accessTier = blob.AccessTier(*info.AccessTier) // } o.setMetadata(metadata) // If it was a Range request, the size is wrong, so correct it if info.ContentRange != nil { contentRange := *info.ContentRange slash := strings.IndexRune(contentRange, '/') if slash >= 0 { i, err := strconv.ParseInt(contentRange[slash+1:], 10, 64) if err == nil { o.size = i } else { fs.Debugf(o, "Failed to find parse integer from in %q: %v", contentRange, err) } } else { fs.Debugf(o, "Failed to find length in %q", contentRange) } } return nil } func (o *Object) decodeMetaDataFromBlob(info *container.BlobItem) (err error) { if info.Properties == nil { return errors.New("nil Properties in decodeMetaDataFromBlob") } metadata := info.Metadata var size int64 if info.Properties.ContentLength == nil { size = -1 } else { size = *info.Properties.ContentLength } if isDirectoryMarker(size, metadata, o.remote) { return fs.ErrorNotAFile } // NOTE - Client library always returns MD5 as base64 decoded string, Object needs to maintain // this as base64 encoded string. o.md5 = base64.StdEncoding.EncodeToString(info.Properties.ContentMD5) if info.Properties.ContentType == nil { o.mimeType = "" } else { o.mimeType = *info.Properties.ContentType } o.size = size if info.Properties.LastModified == nil { o.modTime = time.Now() } else { o.modTime = *info.Properties.LastModified } if info.Properties.AccessTier == nil { o.accessTier = blob.AccessTier("") } else { o.accessTier = *info.Properties.AccessTier } o.setMetadata(metadata) return nil } // getBlobSVC creates a blob client func (o *Object) getBlobSVC() *blob.Client { container, directory := o.split() return o.fs.getBlobSVC(container, directory) } // clearMetaData clears enough metadata so readMetaData will re-read it func (o *Object) clearMetaData() { o.modTime = time.Time{} } // readMetaData gets the metadata if it hasn't already been fetched func (f *Fs) readMetaData(ctx context.Context, container, containerPath string) (blobProperties blob.GetPropertiesResponse, err error) { if !f.containerOK(container) { return blobProperties, fs.ErrorObjectNotFound } blb := f.getBlobSVC(container, containerPath) // Read metadata (this includes metadata) options := blob.GetPropertiesOptions{} err = f.pacer.Call(func() (bool, error) { blobProperties, err = blb.GetProperties(ctx, &options) return f.shouldRetry(ctx, err) }) if err != nil { // On directories - GetProperties does not work and current SDK does not populate service code correctly hence check regular http response as well if storageErr, ok := err.(*azcore.ResponseError); ok && (storageErr.ErrorCode == string(bloberror.BlobNotFound) || storageErr.StatusCode == http.StatusNotFound) { return blobProperties, fs.ErrorObjectNotFound } return blobProperties, err } return blobProperties, nil } // readMetaData gets the metadata if it hasn't already been fetched // // Sets // // o.id // o.modTime // o.size // o.md5 func (o *Object) readMetaData(ctx context.Context) (err error) { if !o.modTime.IsZero() { return nil } container, containerPath := o.split() blobProperties, err := o.fs.readMetaData(ctx, container, containerPath) if err != nil { return err } return o.decodeMetaDataFromPropertiesResponse(&blobProperties) } // ModTime returns the modification time of the object // // It attempts to read the objects mtime and if that isn't present the // LastModified returned in the http headers func (o *Object) ModTime(ctx context.Context) (result time.Time) { // The error is logged in readMetaData _ = o.readMetaData(ctx) return o.modTime } // SetModTime sets the modification time of the local fs object func (o *Object) SetModTime(ctx context.Context, modTime time.Time) error { o.updateMetadataWithModTime(modTime) blb := o.getBlobSVC() opt := blob.SetMetadataOptions{} err := o.fs.pacer.Call(func() (bool, error) { _, err := blb.SetMetadata(ctx, o.getMetadata(), &opt) return o.fs.shouldRetry(ctx, err) }) if err != nil { return err } o.modTime = modTime return nil } // Storable returns if this object is storable func (o *Object) Storable() bool { return true } // Open an object for read func (o *Object) Open(ctx context.Context, options ...fs.OpenOption) (in io.ReadCloser, err error) { // Offset and Count for range download var offset int64 var count int64 if o.AccessTier() == blob.AccessTierArchive { return nil, fmt.Errorf("blob in archive tier, you need to set tier to hot, cool, cold first") } fs.FixRangeOption(options, o.size) for _, option := range options { switch x := option.(type) { case *fs.RangeOption: offset, count = x.Decode(o.size) if count < 0 { count = o.size - offset } case *fs.SeekOption: offset = x.Offset default: if option.Mandatory() { fs.Logf(o, "Unsupported mandatory option: %v", option) } } } blb := o.getBlobSVC() opt := blob.DownloadStreamOptions{ // When set to true and specified together with the Range, the service returns the MD5 hash for the range, as long as the // range is less than or equal to 4 MB in size. //RangeGetContentMD5 *bool // Range specifies a range of bytes. The default value is all bytes. //Range HTTPRange Range: blob.HTTPRange{ Offset: offset, Count: count, }, // AccessConditions *AccessConditions // CpkInfo *CpkInfo // CpkScopeInfo *CpkScopeInfo } var downloadResponse blob.DownloadStreamResponse err = o.fs.pacer.Call(func() (bool, error) { downloadResponse, err = blb.DownloadStream(ctx, &opt) return o.fs.shouldRetry(ctx, err) }) if err != nil { return nil, fmt.Errorf("failed to open for download: %w", err) } err = o.decodeMetaDataFromDownloadResponse(&downloadResponse) if err != nil { return nil, fmt.Errorf("failed to decode metadata for download: %w", err) } return downloadResponse.Body, nil } // Converts a string into a pointer to a string func pString(s string) *string { return &s } // readSeekCloser joins an io.Reader and an io.Seeker and provides a no-op io.Closer type readSeekCloser struct { io.Reader io.Seeker } // Close does nothing func (rs *readSeekCloser) Close() error { return nil } // record chunk number and id for Close type azBlock struct { chunkNumber uint64 id string } // Implements the fs.ChunkWriter interface type azChunkWriter struct { chunkSize int64 size int64 f *Fs ui uploadInfo blocksMu sync.Mutex // protects the below blocks []azBlock // list of blocks for finalize o *Object } // OpenChunkWriter returns the chunk size and a ChunkWriter // // Pass in the remote and the src object // You can also use options to hint at the desired chunk size func (f *Fs) OpenChunkWriter(ctx context.Context, remote string, src fs.ObjectInfo, options ...fs.OpenOption) (info fs.ChunkWriterInfo, writer fs.ChunkWriter, err error) { // Temporary Object under construction o := &Object{ fs: f, remote: remote, } ui, err := o.prepareUpload(ctx, src, options) if err != nil { return info, nil, fmt.Errorf("failed to prepare upload: %w", err) } // Calculate correct partSize partSize := f.opt.ChunkSize totalParts := -1 size := src.Size() // Note that the max size of file is 4.75 TB (100 MB X 50,000 // blocks) and this is bigger than the max uncommitted block // size (9.52 TB) so we do not need to part commit block lists // or garbage collect uncommitted blocks. // // See: https://docs.microsoft.com/en-gb/rest/api/storageservices/put-block // size can be -1 here meaning we don't know the size of the incoming file. We use ChunkSize // buffers here (default 4MB). With a maximum number of parts (50,000) this will be a file of // 195GB which seems like a not too unreasonable limit. if size == -1 { warnStreamUpload.Do(func() { fs.Logf(f, "Streaming uploads using chunk size %v will have maximum file size of %v", f.opt.ChunkSize, partSize*fs.SizeSuffix(blockblob.MaxBlocks)) }) } else { partSize = chunksize.Calculator(remote, size, blockblob.MaxBlocks, f.opt.ChunkSize) if partSize > fs.SizeSuffix(blockblob.MaxStageBlockBytes) { return info, nil, fmt.Errorf("can't upload as it is too big %v - takes more than %d chunks of %v", fs.SizeSuffix(size), fs.SizeSuffix(blockblob.MaxBlocks), fs.SizeSuffix(blockblob.MaxStageBlockBytes)) } totalParts = int(fs.SizeSuffix(size) / partSize) if fs.SizeSuffix(size)%partSize != 0 { totalParts++ } } fs.Debugf(o, "Multipart upload session started for %d parts of size %v", totalParts, partSize) chunkWriter := &azChunkWriter{ chunkSize: int64(partSize), size: size, f: f, ui: ui, o: o, } info = fs.ChunkWriterInfo{ ChunkSize: int64(partSize), Concurrency: o.fs.opt.UploadConcurrency, //LeavePartsOnError: o.fs.opt.LeavePartsOnError, } fs.Debugf(o, "open chunk writer: started multipart upload") return info, chunkWriter, nil } // WriteChunk will write chunk number with reader bytes, where chunk number >= 0 func (w *azChunkWriter) WriteChunk(ctx context.Context, chunkNumber int, reader io.ReadSeeker) (int64, error) { if chunkNumber < 0 { err := fmt.Errorf("invalid chunk number provided: %v", chunkNumber) return -1, err } // Upload the block, with MD5 for check m := md5.New() currentChunkSize, err := io.Copy(m, reader) if err != nil { return -1, err } // If no data read, don't write the chunk if currentChunkSize == 0 { return 0, nil } md5sum := m.Sum(nil) // increment the blockID and save the blocks for finalize var binaryBlockID [8]byte // block counter as LSB first 8 bytes binary.LittleEndian.PutUint64(binaryBlockID[:], uint64(chunkNumber)) blockID := base64.StdEncoding.EncodeToString(binaryBlockID[:]) // Save the blockID for the commit w.blocksMu.Lock() w.blocks = append(w.blocks, azBlock{ chunkNumber: uint64(chunkNumber), id: blockID, }) w.blocksMu.Unlock() err = w.f.pacer.Call(func() (bool, error) { // rewind the reader on retry and after reading md5 _, err = reader.Seek(0, io.SeekStart) if err != nil { return false, err } options := blockblob.StageBlockOptions{ // Specify the transactional md5 for the body, to be validated by the service. TransactionalValidation: blob.TransferValidationTypeMD5(md5sum), } _, err = w.ui.blb.StageBlock(ctx, blockID, &readSeekCloser{Reader: reader, Seeker: reader}, &options) if err != nil { if chunkNumber <= 8 { return w.f.shouldRetry(ctx, err) } // retry all chunks once have done the first few return true, err } return false, nil }) if err != nil { return -1, fmt.Errorf("failed to upload chunk %d with %v bytes: %w", chunkNumber+1, currentChunkSize, err) } fs.Debugf(w.o, "multipart upload wrote chunk %d with %v bytes", chunkNumber+1, currentChunkSize) return currentChunkSize, err } // Abort the multipart upload. // // FIXME it would be nice to delete uncommitted blocks. // // See: https://github.com/rclone/rclone/issues/5583 // // However there doesn't seem to be an easy way of doing this other than // by deleting the target. // // This means that a failed upload deletes the target which isn't ideal. // // Uploading a zero length blob and deleting it will remove the // uncommitted blocks I think. // // Could check to see if a file exists already and if it doesn't then // create a 0 length file and delete it to flush the uncommitted // blocks. // // This is what azcopy does // https://github.com/MicrosoftDocs/azure-docs/issues/36347#issuecomment-541457962 func (w *azChunkWriter) Abort(ctx context.Context) error { fs.Debugf(w.o, "multipart upload aborted (did nothing - see issue #5583)") return nil } // Close and finalise the multipart upload func (w *azChunkWriter) Close(ctx context.Context) (err error) { // sort the completed parts by part number sort.Slice(w.blocks, func(i, j int) bool { return w.blocks[i].chunkNumber < w.blocks[j].chunkNumber }) // Create and check a list of block IDs blockIDs := make([]string, len(w.blocks)) for i := range w.blocks { if w.blocks[i].chunkNumber != uint64(i) { return fmt.Errorf("internal error: expecting chunkNumber %d but got %d", i, w.blocks[i].chunkNumber) } chunkBytes, err := base64.StdEncoding.DecodeString(w.blocks[i].id) if err != nil { return fmt.Errorf("internal error: bad block ID: %w", err) } chunkNumber := binary.LittleEndian.Uint64(chunkBytes) if w.blocks[i].chunkNumber != chunkNumber { return fmt.Errorf("internal error: expecting decoded chunkNumber %d but got %d", w.blocks[i].chunkNumber, chunkNumber) } blockIDs[i] = w.blocks[i].id } options := blockblob.CommitBlockListOptions{ Metadata: w.o.getMetadata(), Tier: parseTier(w.f.opt.AccessTier), HTTPHeaders: &w.ui.httpHeaders, } // Finalise the upload session err = w.f.pacer.Call(func() (bool, error) { _, err := w.ui.blb.CommitBlockList(ctx, blockIDs, &options) return w.f.shouldRetry(ctx, err) }) if err != nil { return fmt.Errorf("failed to complete multipart upload: %w", err) } fs.Debugf(w.o, "multipart upload finished") return err } var warnStreamUpload sync.Once // uploadMultipart uploads a file using multipart upload // // Write a larger blob, using CreateBlockBlob, PutBlock, and PutBlockList. func (o *Object) uploadMultipart(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (ui uploadInfo, err error) { chunkWriter, err := multipart.UploadMultipart(ctx, src, in, multipart.UploadMultipartOptions{ Open: o.fs, OpenOptions: options, }) if err != nil { return ui, err } return chunkWriter.(*azChunkWriter).ui, nil } // uploadSinglepart uploads a short blob using a single part upload func (o *Object) uploadSinglepart(ctx context.Context, in io.Reader, size int64, ui uploadInfo) (err error) { chunkSize := int64(o.fs.opt.ChunkSize) // fs.Debugf(o, "Single part upload starting of object %d bytes", size) if size > chunkSize || size < 0 { return fmt.Errorf("internal error: single part upload size too big %d > %d", size, chunkSize) } rw := multipart.NewRW() defer fs.CheckClose(rw, &err) n, err := io.CopyN(rw, in, size+1) if err != nil && err != io.EOF { return fmt.Errorf("single part upload read failed: %w", err) } if n != size { return fmt.Errorf("single part upload: expecting to read %d bytes but read %d", size, n) } rs := &readSeekCloser{Reader: rw, Seeker: rw} options := blockblob.UploadOptions{ Metadata: o.getMetadata(), Tier: parseTier(o.fs.opt.AccessTier), HTTPHeaders: &ui.httpHeaders, } return o.fs.pacer.Call(func() (bool, error) { // rewind the reader on retry _, err = rs.Seek(0, io.SeekStart) if err != nil { return false, err } _, err = ui.blb.Upload(ctx, rs, &options) return o.fs.shouldRetry(ctx, err) }) } // Info needed for an upload type uploadInfo struct { blb *blockblob.Client httpHeaders blob.HTTPHeaders isDirMarker bool } // Prepare the object for upload func (o *Object) prepareUpload(ctx context.Context, src fs.ObjectInfo, options []fs.OpenOption) (ui uploadInfo, err error) { container, containerPath := o.split() if container == "" || containerPath == "" { return ui, fmt.Errorf("can't upload to root - need a container") } // Create parent dir/bucket if not saving directory marker metadataMu.Lock() _, ui.isDirMarker = o.meta[dirMetaKey] metadataMu.Unlock() if !ui.isDirMarker { err = o.fs.mkdirParent(ctx, o.remote) if err != nil { return ui, err } } // Update Mod time o.updateMetadataWithModTime(src.ModTime(ctx)) if err != nil { return ui, err } // Create the HTTP headers for the upload ui.httpHeaders = blob.HTTPHeaders{ BlobContentType: pString(fs.MimeType(ctx, src)), } // Compute the Content-MD5 of the file. As we stream all uploads it // will be set in PutBlockList API call using the 'x-ms-blob-content-md5' header if !o.fs.opt.DisableCheckSum { if sourceMD5, _ := src.Hash(ctx, hash.MD5); sourceMD5 != "" { sourceMD5bytes, err := hex.DecodeString(sourceMD5) if err == nil { ui.httpHeaders.BlobContentMD5 = sourceMD5bytes } else { fs.Debugf(o, "Failed to decode %q as MD5: %v", sourceMD5, err) } } } // Apply upload options (also allows one to overwrite content-type) for _, option := range options { key, value := option.Header() lowerKey := strings.ToLower(key) switch lowerKey { case "": // ignore case "cache-control": ui.httpHeaders.BlobCacheControl = pString(value) case "content-disposition": ui.httpHeaders.BlobContentDisposition = pString(value) case "content-encoding": ui.httpHeaders.BlobContentEncoding = pString(value) case "content-language": ui.httpHeaders.BlobContentLanguage = pString(value) case "content-type": ui.httpHeaders.BlobContentType = pString(value) } } ui.blb = o.fs.getBlockBlobSVC(container, containerPath) return ui, nil } // Update the object with the contents of the io.Reader, modTime and size // // The new object may have been created if an error is returned func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (err error) { if o.accessTier == blob.AccessTierArchive { if o.fs.opt.ArchiveTierDelete { fs.Debugf(o, "deleting archive tier blob before updating") err = o.Remove(ctx) if err != nil { return fmt.Errorf("failed to delete archive blob before updating: %w", err) } } else { return errCantUpdateArchiveTierBlobs } } size := src.Size() multipartUpload := size < 0 || size > int64(o.fs.opt.ChunkSize) var ui uploadInfo if multipartUpload { ui, err = o.uploadMultipart(ctx, in, src, options...) } else { ui, err = o.prepareUpload(ctx, src, options) if err != nil { return fmt.Errorf("failed to prepare upload: %w", err) } err = o.uploadSinglepart(ctx, in, size, ui) } if err != nil { return err } // Refresh metadata on object if !ui.isDirMarker { o.clearMetaData() err = o.readMetaData(ctx) if err != nil { return err } } // If tier is not changed or not specified, do not attempt to invoke `SetBlobTier` operation if o.fs.opt.AccessTier == string(defaultAccessTier) || o.fs.opt.AccessTier == string(o.AccessTier()) { return nil } // Now, set blob tier based on configured access tier return o.SetTier(o.fs.opt.AccessTier) } // Remove an object func (o *Object) Remove(ctx context.Context) error { blb := o.getBlobSVC() opt := blob.DeleteOptions{} if o.fs.opt.DeleteSnapshots != "" { action := blob.DeleteSnapshotsOptionType(o.fs.opt.DeleteSnapshots) opt.DeleteSnapshots = &action } return o.fs.pacer.Call(func() (bool, error) { _, err := blb.Delete(ctx, &opt) return o.fs.shouldRetry(ctx, err) }) } // MimeType of an Object if known, "" otherwise func (o *Object) MimeType(ctx context.Context) string { return o.mimeType } // AccessTier of an object, default is of type none func (o *Object) AccessTier() blob.AccessTier { return o.accessTier } // SetTier performs changing object tier func (o *Object) SetTier(tier string) error { if !validateAccessTier(tier) { return fmt.Errorf("tier %s not supported by Azure Blob Storage", tier) } // Check if current tier already matches with desired tier if o.GetTier() == tier { return nil } desiredAccessTier := blob.AccessTier(tier) blb := o.getBlobSVC() ctx := context.Background() priority := blob.RehydratePriorityStandard opt := blob.SetTierOptions{ RehydratePriority: &priority, } err := o.fs.pacer.Call(func() (bool, error) { _, err := blb.SetTier(ctx, desiredAccessTier, &opt) return o.fs.shouldRetry(ctx, err) }) if err != nil { return fmt.Errorf("failed to set Blob Tier: %w", err) } // Set access tier on local object also, this typically // gets updated on get blob properties o.accessTier = desiredAccessTier fs.Debugf(o, "Successfully changed object tier to %s", tier) return nil } // GetTier returns object tier in azure as string func (o *Object) GetTier() string { return string(o.accessTier) } func parseTier(tier string) *blob.AccessTier { if tier == "" { return nil } msTier := blob.AccessTier(tier) return &msTier } // Check the interfaces are satisfied var ( _ fs.Fs = &Fs{} _ fs.Copier = &Fs{} _ fs.PutStreamer = &Fs{} _ fs.Purger = &Fs{} _ fs.ListRer = &Fs{} _ fs.OpenChunkWriter = &Fs{} _ fs.Object = &Object{} _ fs.MimeTyper = &Object{} _ fs.GetTierer = &Object{} _ fs.SetTierer = &Object{} )