package registry import ( "fmt" "strings" "github.com/docker/docker-registry/digest" ) // ErrorCode represents the error type. The errors are serialized via strings // and the integer format may change and should *never* be exported. type ErrorCode int const ( // ErrorCodeUnknown is a catch-all for errors not defined below. ErrorCodeUnknown ErrorCode = iota // The following errors can happen during a layer upload. // ErrorCodeInvalidDigest is returned when uploading a layer if the // provided digest does not match the layer contents. ErrorCodeInvalidDigest // ErrorCodeInvalidLength is returned when uploading a layer if the provided // length does not match the content length. ErrorCodeInvalidLength // ErrorCodeInvalidName is returned when the name in the manifest does not // match the provided name. ErrorCodeInvalidName // ErrorCodeInvalidTag is returned when the tag in the manifest does not // match the provided tag. ErrorCodeInvalidTag // ErrorCodeUnverifiedManifest is returned when the manifest fails signature // validation. ErrorCodeUnverifiedManifest // ErrorCodeUnknownLayer is returned when the manifest references a // nonexistent layer. ErrorCodeUnknownLayer // ErrorCodeUnknownLayerUpload is returned when an upload is accessed. ErrorCodeUnknownLayerUpload // ErrorCodeUntrustedSignature is returned when the manifest is signed by an // untrusted source. ErrorCodeUntrustedSignature ) var errorCodeStrings = map[ErrorCode]string{ ErrorCodeUnknown: "UNKNOWN", ErrorCodeInvalidDigest: "INVALID_DIGEST", ErrorCodeInvalidLength: "INVALID_LENGTH", ErrorCodeInvalidName: "INVALID_NAME", ErrorCodeInvalidTag: "INVALID_TAG", ErrorCodeUnverifiedManifest: "UNVERIFIED_MANIFEST", ErrorCodeUnknownLayer: "UNKNOWN_LAYER", ErrorCodeUnknownLayerUpload: "UNKNOWN_LAYER_UPLOAD", ErrorCodeUntrustedSignature: "UNTRUSTED_SIGNATURE", } var errorCodesMessages = map[ErrorCode]string{ ErrorCodeUnknown: "unknown error", ErrorCodeInvalidDigest: "provided digest did not match uploaded content", ErrorCodeInvalidLength: "provided length did not match content length", ErrorCodeInvalidName: "Manifest name did not match URI", ErrorCodeInvalidTag: "Manifest tag did not match URI", ErrorCodeUnverifiedManifest: "Manifest failed signature validation", ErrorCodeUnknownLayer: "Referenced layer not available", ErrorCodeUnknownLayerUpload: "cannot resume unknown layer upload", ErrorCodeUntrustedSignature: "Manifest signed by untrusted source", } var stringToErrorCode map[string]ErrorCode func init() { stringToErrorCode = make(map[string]ErrorCode, len(errorCodeStrings)) // Build up reverse error code map for k, v := range errorCodeStrings { stringToErrorCode[v] = k } } // ParseErrorCode attempts to parse the error code string, returning // ErrorCodeUnknown if the error is not known. func ParseErrorCode(s string) ErrorCode { ec, ok := stringToErrorCode[s] if !ok { return ErrorCodeUnknown } return ec } // String returns the canonical identifier for this error code. func (ec ErrorCode) String() string { s, ok := errorCodeStrings[ec] if !ok { return errorCodeStrings[ErrorCodeUnknown] } return s } // Message returned the human-readable error message for this error code. func (ec ErrorCode) Message() string { m, ok := errorCodesMessages[ec] if !ok { return errorCodesMessages[ErrorCodeUnknown] } return m } // MarshalText encodes the receiver into UTF-8-encoded text and returns the // result. func (ec ErrorCode) MarshalText() (text []byte, err error) { return []byte(ec.String()), nil } // UnmarshalText decodes the form generated by MarshalText. func (ec *ErrorCode) UnmarshalText(text []byte) error { *ec = stringToErrorCode[string(text)] return nil } // Error provides a wrapper around ErrorCode with extra Details provided. type Error struct { Code ErrorCode `json:"code"` Message string `json:"message,omitempty"` Detail interface{} `json:"detail,omitempty"` } // Error returns a human readable representation of the error. func (e Error) Error() string { return fmt.Sprintf("%s: %s", strings.ToLower(strings.Replace(e.Code.String(), "_", " ", -1)), e.Message) } // Errors provides the envelope for multiple errors and a few sugar methods // for use within the application. type Errors struct { Errors []error `json:"errors,omitempty"` } // Push pushes an error on to the error stack, with the optional detail // argument. It is a programming error (ie panic) to push more than one // detail at a time. func (errs *Errors) Push(code ErrorCode, details ...interface{}) { if len(details) > 1 { panic("please specify zero or one detail items for this error") } var detail interface{} if len(details) > 0 { detail = details[0] } if err, ok := detail.(error); ok { detail = err.Error() } errs.PushErr(Error{ Code: code, Message: code.Message(), Detail: detail, }) } // PushErr pushes an error interface onto the error stack. func (errs *Errors) PushErr(err error) { errs.Errors = append(errs.Errors, err) } func (errs *Errors) Error() string { switch errs.Len() { case 0: return "" case 1: return errs.Errors[0].Error() default: msg := "errors:\n" for _, err := range errs.Errors { msg += err.Error() + "\n" } return msg } } // Clear clears the errors. func (errs *Errors) Clear() { errs.Errors = errs.Errors[:0] } // Len returns the current number of errors. func (errs *Errors) Len() int { return len(errs.Errors) } // DetailUnknownLayer provides detail for unknown layer errors, returned by // image manifest push for layers that are not yet transferred. This intended // to only be used on the backend to return detail for this specific error. type DetailUnknownLayer struct { // Unknown should contain the contents of a layer descriptor, which is a // single FSLayer currently. Unknown FSLayer `json:"unknown"` } // RepositoryNotFoundError is returned when making an operation against a // repository that does not exist in the registry. type RepositoryNotFoundError struct { Name string } func (e *RepositoryNotFoundError) Error() string { return fmt.Sprintf("No repository found with Name: %s", e.Name) } // ImageManifestNotFoundError is returned when making an operation against a // given image manifest that does not exist in the registry. type ImageManifestNotFoundError struct { Name string Tag string } func (e *ImageManifestNotFoundError) Error() string { return fmt.Sprintf("No manifest found with Name: %s, Tag: %s", e.Name, e.Tag) } // BlobNotFoundError is returned when making an operation against a given image // layer that does not exist in the registry. type BlobNotFoundError struct { Name string Digest digest.Digest } func (e *BlobNotFoundError) Error() string { return fmt.Sprintf("No blob found with Name: %s, Digest: %s", e.Name, e.Digest) } // BlobUploadNotFoundError is returned when making a blob upload operation against an // invalid blob upload location url. // This may be the result of using a cancelled, completed, or stale upload // location. type BlobUploadNotFoundError struct { Location string } func (e *BlobUploadNotFoundError) Error() string { return fmt.Sprintf("No blob upload found at Location: %s", e.Location) } // BlobUploadInvalidRangeError is returned when attempting to upload an image // blob chunk that is out of order. // This provides the known BlobSize and LastValidRange which can be used to // resume the upload. type BlobUploadInvalidRangeError struct { Location string LastValidRange int BlobSize int } func (e *BlobUploadInvalidRangeError) Error() string { return fmt.Sprintf( "Invalid range provided for upload at Location: %s. Last Valid Range: %d, Blob Size: %d", e.Location, e.LastValidRange, e.BlobSize) } // UnexpectedHTTPStatusError is returned when an unexpected HTTP status is // returned when making a registry api call. type UnexpectedHTTPStatusError struct { Status string } func (e *UnexpectedHTTPStatusError) Error() string { return fmt.Sprintf("Received unexpected HTTP status: %s", e.Status) }