distribution/registry/api/v2/errors.go

package v2

import (
	"net/http"

	"github.com/docker/distribution/registry/api/errcode"
)

const (
	// ErrorCodeUnsupported is returned when an operation is not supported.
	ErrorCodeUnsupported = iota

	// ErrorCodeUnauthorized is returned if a request is not authorized.
	ErrorCodeUnauthorized

	// ErrorCodeDigestInvalid is returned when uploading a blob if the
	// provided digest does not match the blob contents.
	ErrorCodeDigestInvalid

	// ErrorCodeSizeInvalid is returned when uploading a blob if the provided
	// size does not match the content length.
	ErrorCodeSizeInvalid

	// ErrorCodeNameInvalid is returned when the name in the manifest does not
	// match the provided name.
	ErrorCodeNameInvalid

	// ErrorCodeTagInvalid is returned when the tag in the manifest does not
	// match the provided tag.
	ErrorCodeTagInvalid

	// ErrorCodeNameUnknown when the repository name is not known.
	ErrorCodeNameUnknown

	// ErrorCodeManifestUnknown returned when image manifest is unknown.
	ErrorCodeManifestUnknown

	// ErrorCodeManifestInvalid returned when an image manifest is invalid,
	// typically during a PUT operation. This error encompasses all errors
	// encountered during manifest validation that aren't signature errors.
	ErrorCodeManifestInvalid

	// ErrorCodeManifestUnverified is returned when the manifest fails
	// signature verfication.
	ErrorCodeManifestUnverified

	// ErrorCodeManifestBlobUnknown is returned when a manifest blob is
	// unknown to the registry.
	ErrorCodeManifestBlobUnknown

	// ErrorCodeBlobUnknown is returned when a blob is unknown to the
	// registry. This can happen when the manifest references a nonexistent
	// layer or the result is not found by a blob fetch.
	ErrorCodeBlobUnknown

	// ErrorCodeBlobUploadUnknown is returned when an upload is unknown.
	ErrorCodeBlobUploadUnknown

	// ErrorCodeBlobUploadInvalid is returned when an upload is invalid.
	ErrorCodeBlobUploadInvalid
)

// ErrorDescriptors provides a list of HTTP API Error codes that may be
// encountered when interacting with the registry API.
var errorDescriptors = []errcode.ErrorDescriptor{
	{
		Code:    ErrorCodeUnsupported,
		Value:   "UNSUPPORTED",
		Message: "The operation is unsupported.",
		Description: `The operation was unsupported due to a missing
		implementation or invalid set of parameters.`,
	},
	{
		Code:    ErrorCodeUnauthorized,
		Value:   "UNAUTHORIZED",
		Message: "access to the requested resource is not authorized",
		Description: `The access controller denied access for the operation on
		a resource. Often this will be accompanied by a 401 Unauthorized
		response status.`,
		HTTPStatusCode: http.StatusForbidden,
	},
	{
		Code:    ErrorCodeDigestInvalid,
		Value:   "DIGEST_INVALID",
		Message: "provided digest did not match uploaded content",
		Description: `When a blob is uploaded, the registry will check that
		the content matches the digest provided by the client. The error may
		include a detail structure with the key "digest", including the
		invalid digest string. This error may also be returned when a manifest
		includes an invalid layer digest.`,
		HTTPStatusCode: http.StatusBadRequest,
	},
	{
		Code:    ErrorCodeSizeInvalid,
		Value:   "SIZE_INVALID",
		Message: "provided length did not match content length",
		Description: `When a layer is uploaded, the provided size will be
		checked against the uploaded content. If they do not match, this error
		will be returned.`,
		HTTPStatusCode: http.StatusBadRequest,
	},
	{
		Code:    ErrorCodeNameInvalid,
		Value:   "NAME_INVALID",
		Message: "invalid repository name",
		Description: `Invalid repository name encountered either during
		manifest validation or any API operation.`,
		HTTPStatusCode: http.StatusBadRequest,
	},
	{
		Code:    ErrorCodeTagInvalid,
		Value:   "TAG_INVALID",
		Message: "manifest tag did not match URI",
		Description: `During a manifest upload, if the tag in the manifest
		does not match the uri tag, this error will be returned.`,
		HTTPStatusCode: http.StatusBadRequest,
	},
	{
		Code:    ErrorCodeNameUnknown,
		Value:   "NAME_UNKNOWN",
		Message: "repository name not known to registry",
		Description: `This is returned if the name used during an operation is
		unknown to the registry.`,
		HTTPStatusCode: http.StatusNotFound,
	},
	{
		Code:    ErrorCodeManifestUnknown,
		Value:   "MANIFEST_UNKNOWN",
		Message: "manifest unknown",
		Description: `This error is returned when the manifest, identified by
		name and tag is unknown to the repository.`,
		HTTPStatusCode: http.StatusNotFound,
	},
	{
		Code:    ErrorCodeManifestInvalid,
		Value:   "MANIFEST_INVALID",
		Message: "manifest invalid",
		Description: `During upload, manifests undergo several checks ensuring
		validity. If those checks fail, this error may be returned, unless a
		more specific error is included. The detail will contain information
		the failed validation.`,
		HTTPStatusCode: http.StatusBadRequest,
	},
	{
		Code:    ErrorCodeManifestUnverified,
		Value:   "MANIFEST_UNVERIFIED",
		Message: "manifest failed signature verification",
		Description: `During manifest upload, if the manifest fails signature
		verification, this error will be returned.`,
		HTTPStatusCode: http.StatusBadRequest,
	},
	{
		Code:    ErrorCodeManifestBlobUnknown,
		Value:   "MANIFEST_BLOB_UNKNOWN",
		Message: "blob unknown to registry",
		Description: `This error may be returned when a manifest blob is 
		unknown to the registry.`,
		HTTPStatusCode: http.StatusBadRequest,
	},
	{
		Code:    ErrorCodeBlobUnknown,
		Value:   "BLOB_UNKNOWN",
		Message: "blob unknown to registry",
		Description: `This error may be returned when a blob is unknown to the
		registry in a specified repository. This can be returned with a
		standard get or if a manifest references an unknown layer during
		upload.`,
		HTTPStatusCode: http.StatusNotFound,
	},

	{
		Code:    ErrorCodeBlobUploadUnknown,
		Value:   "BLOB_UPLOAD_UNKNOWN",
		Message: "blob upload unknown to registry",
		Description: `If a blob upload has been cancelled or was never
		started, this error code may be returned.`,
		HTTPStatusCode: http.StatusNotFound,
	},
	{
		Code:    ErrorCodeBlobUploadInvalid,
		Value:   "BLOB_UPLOAD_INVALID",
		Message: "blob upload invalid",
		Description: `The blob upload encountered an error and can no
		longer proceed.`,
		HTTPStatusCode: http.StatusNotFound,
	},
}

// init registers our errors with the errcode system
func init() {
	errcode.LoadErrors(errorDescriptors)
}