package handlers import ( "fmt" "io" "net/http" "net/url" "os" "github.com/docker/distribution/api/v2" ctxu "github.com/docker/distribution/context" "github.com/docker/distribution/digest" "github.com/docker/distribution/storage" "github.com/gorilla/handlers" ) // layerUploadDispatcher constructs and returns the layer upload handler for // the given request context. func layerUploadDispatcher(ctx *Context, r *http.Request) http.Handler { luh := &layerUploadHandler{ Context: ctx, UUID: getUploadUUID(ctx), } handler := http.Handler(handlers.MethodHandler{ "POST": http.HandlerFunc(luh.StartLayerUpload), "GET": http.HandlerFunc(luh.GetUploadStatus), "HEAD": http.HandlerFunc(luh.GetUploadStatus), // TODO(stevvooe): Must implement patch support. // "PATCH": http.HandlerFunc(luh.PutLayerChunk), "PUT": http.HandlerFunc(luh.PutLayerUploadComplete), "DELETE": http.HandlerFunc(luh.CancelLayerUpload), }) if luh.UUID != "" { state, err := hmacKey(ctx.Config.HTTP.Secret).unpackUploadState(r.FormValue("_state")) if err != nil { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { ctxu.GetLogger(ctx).Infof("error resolving upload: %v", err) w.WriteHeader(http.StatusBadRequest) luh.Errors.Push(v2.ErrorCodeBlobUploadInvalid, err) }) } luh.State = state if state.Name != ctx.Repository.Name() { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { ctxu.GetLogger(ctx).Infof("mismatched repository name in upload state: %q != %q", state.Name, luh.Repository.Name()) w.WriteHeader(http.StatusBadRequest) luh.Errors.Push(v2.ErrorCodeBlobUploadInvalid, err) }) } if state.UUID != luh.UUID { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { ctxu.GetLogger(ctx).Infof("mismatched uuid in upload state: %q != %q", state.UUID, luh.UUID) w.WriteHeader(http.StatusBadRequest) luh.Errors.Push(v2.ErrorCodeBlobUploadInvalid, err) }) } layers := ctx.Repository.Layers() upload, err := layers.Resume(luh.UUID) if err != nil { ctxu.GetLogger(ctx).Errorf("error resolving upload: %v", err) if err == storage.ErrLayerUploadUnknown { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusNotFound) luh.Errors.Push(v2.ErrorCodeBlobUploadUnknown, err) }) } return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusInternalServerError) luh.Errors.Push(v2.ErrorCodeUnknown, err) }) } luh.Upload = upload if state.Offset > 0 { // Seek the layer upload to the correct spot if it's non-zero. // These error conditions should be rare and demonstrate really // problems. We basically cancel the upload and tell the client to // start over. if nn, err := upload.Seek(luh.State.Offset, os.SEEK_SET); err != nil { defer upload.Close() ctxu.GetLogger(ctx).Infof("error seeking layer upload: %v", err) return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusBadRequest) luh.Errors.Push(v2.ErrorCodeBlobUploadInvalid, err) upload.Cancel() }) } else if nn != luh.State.Offset { defer upload.Close() ctxu.GetLogger(ctx).Infof("seek to wrong offest: %d != %d", nn, luh.State.Offset) return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusBadRequest) luh.Errors.Push(v2.ErrorCodeBlobUploadInvalid, err) upload.Cancel() }) } } handler = closeResources(handler, luh.Upload) } return handler } // layerUploadHandler handles the http layer upload process. type layerUploadHandler struct { *Context // UUID identifies the upload instance for the current request. UUID string Upload storage.LayerUpload State layerUploadState } // StartLayerUpload begins the layer upload process and allocates a server- // side upload session. func (luh *layerUploadHandler) StartLayerUpload(w http.ResponseWriter, r *http.Request) { layers := luh.Repository.Layers() upload, err := layers.Upload() if err != nil { w.WriteHeader(http.StatusInternalServerError) // Error conditions here? luh.Errors.Push(v2.ErrorCodeUnknown, err) return } luh.Upload = upload defer luh.Upload.Close() if err := luh.layerUploadResponse(w, r); err != nil { w.WriteHeader(http.StatusInternalServerError) // Error conditions here? luh.Errors.Push(v2.ErrorCodeUnknown, err) return } w.WriteHeader(http.StatusAccepted) } // GetUploadStatus returns the status of a given upload, identified by uuid. func (luh *layerUploadHandler) GetUploadStatus(w http.ResponseWriter, r *http.Request) { if luh.Upload == nil { w.WriteHeader(http.StatusNotFound) luh.Errors.Push(v2.ErrorCodeBlobUploadUnknown) return } if err := luh.layerUploadResponse(w, r); err != nil { w.WriteHeader(http.StatusInternalServerError) // Error conditions here? luh.Errors.Push(v2.ErrorCodeUnknown, err) return } w.WriteHeader(http.StatusNoContent) } // PutLayerUploadComplete takes the final request of a layer upload. The final // chunk may include all the layer data, the final chunk of layer data or no // layer data. Any data provided is received and verified. If successful, the // layer is linked into the blob store and 201 Created is returned with the // canonical url of the layer. func (luh *layerUploadHandler) PutLayerUploadComplete(w http.ResponseWriter, r *http.Request) { if luh.Upload == nil { w.WriteHeader(http.StatusNotFound) luh.Errors.Push(v2.ErrorCodeBlobUploadUnknown) return } dgstStr := r.FormValue("digest") // TODO(stevvooe): Support multiple digest parameters! if dgstStr == "" { // no digest? return error, but allow retry. w.WriteHeader(http.StatusNotFound) luh.Errors.Push(v2.ErrorCodeDigestInvalid, "digest missing") return } dgst, err := digest.ParseDigest(dgstStr) if err != nil { // no digest? return error, but allow retry. w.WriteHeader(http.StatusNotFound) luh.Errors.Push(v2.ErrorCodeDigestInvalid, "digest parsing failed") return } // TODO(stevvooe): Check the incoming range header here, per the // specification. LayerUpload should be seeked (sought?) to that position. // Read in the final chunk, if any. io.Copy(luh.Upload, r.Body) layer, err := luh.Upload.Finish(dgst) if err != nil { switch err := err.(type) { case storage.ErrLayerInvalidDigest: w.WriteHeader(http.StatusBadRequest) luh.Errors.Push(v2.ErrorCodeDigestInvalid, err) default: ctxu.GetLogger(luh).Errorf("unknown error completing upload: %#v", err) w.WriteHeader(http.StatusInternalServerError) luh.Errors.Push(v2.ErrorCodeUnknown, err) } // Clean up the backend layer data if there was an error. if err := luh.Upload.Cancel(); err != nil { // If the cleanup fails, all we can do is observe and report. ctxu.GetLogger(luh).Errorf("error canceling upload after error: %v", err) } return } // Build our canonical layer url layerURL, err := luh.urlBuilder.BuildBlobURL(layer.Name(), layer.Digest()) if err != nil { luh.Errors.Push(v2.ErrorCodeUnknown, err) w.WriteHeader(http.StatusInternalServerError) return } w.Header().Set("Location", layerURL) w.Header().Set("Content-Length", "0") w.WriteHeader(http.StatusCreated) } // CancelLayerUpload cancels an in-progress upload of a layer. func (luh *layerUploadHandler) CancelLayerUpload(w http.ResponseWriter, r *http.Request) { if luh.Upload == nil { w.WriteHeader(http.StatusNotFound) luh.Errors.Push(v2.ErrorCodeBlobUploadUnknown) return } if err := luh.Upload.Cancel(); err != nil { ctxu.GetLogger(luh).Errorf("error encountered canceling upload: %v", err) w.WriteHeader(http.StatusInternalServerError) luh.Errors.PushErr(err) } w.WriteHeader(http.StatusNoContent) } // layerUploadResponse provides a standard request for uploading layers and // chunk responses. This sets the correct headers but the response status is // left to the caller. func (luh *layerUploadHandler) layerUploadResponse(w http.ResponseWriter, r *http.Request) error { offset, err := luh.Upload.Seek(0, os.SEEK_CUR) if err != nil { ctxu.GetLogger(luh).Errorf("unable get current offset of layer upload: %v", err) return err } // TODO(stevvooe): Need a better way to manage the upload state automatically. luh.State.Name = luh.Repository.Name() luh.State.UUID = luh.Upload.UUID() luh.State.Offset = offset luh.State.StartedAt = luh.Upload.StartedAt() token, err := hmacKey(luh.Config.HTTP.Secret).packUploadState(luh.State) if err != nil { ctxu.GetLogger(luh).Infof("error building upload state token: %s", err) return err } uploadURL, err := luh.urlBuilder.BuildBlobUploadChunkURL( luh.Upload.Name(), luh.Upload.UUID(), url.Values{ "_state": []string{token}, }) if err != nil { ctxu.GetLogger(luh).Infof("error building upload url: %s", err) return err } w.Header().Set("Location", uploadURL) w.Header().Set("Content-Length", "0") w.Header().Set("Range", fmt.Sprintf("0-%d", luh.State.Offset)) return nil }