package upload import ( "fmt" "io/ioutil" "net/http" "net/url" "strings" "gitlab.com/gitlab-org/gitlab/workhorse/internal/api" "gitlab.com/gitlab-org/gitlab/workhorse/internal/filestore" "gitlab.com/gitlab-org/gitlab/workhorse/internal/helper" ) type PreAuthorizer interface { PreAuthorizeHandler(next api.HandleFunc, suffix string) http.Handler } // Verifier allows to check an upload before sending it to rails type Verifier interface { // Verify can abort the upload returning an error Verify(handler *filestore.FileHandler) error } // Preparer allows to customize BodyUploader configuration type Preparer interface { // Prepare converts api.Response into a *SaveFileOpts, it can optionally return an Verifier that will be // invoked after the real upload, before the finalization with rails Prepare(a *api.Response) (*filestore.SaveFileOpts, Verifier, error) } type DefaultPreparer struct{} func (s *DefaultPreparer) Prepare(a *api.Response) (*filestore.SaveFileOpts, Verifier, error) { opts, err := filestore.GetOpts(a) return opts, nil, err } // BodyUploader is an http.Handler that perform a pre authorization call to rails before hijacking the request body and // uploading it. // Providing an Preparer allows to customize the upload process func BodyUploader(rails PreAuthorizer, h http.Handler, p Preparer) http.Handler { return rails.PreAuthorizeHandler(func(w http.ResponseWriter, r *http.Request, a *api.Response) { opts, verifier, err := p.Prepare(a) if err != nil { helper.Fail500(w, r, fmt.Errorf("BodyUploader: preparation failed: %v", err)) return } fh, err := filestore.SaveFileFromReader(r.Context(), r.Body, r.ContentLength, opts) if err != nil { helper.Fail500(w, r, fmt.Errorf("BodyUploader: upload failed: %v", err)) return } if verifier != nil { if err := verifier.Verify(fh); err != nil { helper.Fail500(w, r, fmt.Errorf("BodyUploader: verification failed: %v", err)) return } } data := url.Values{} fields, err := fh.GitLabFinalizeFields("file") if err != nil { helper.Fail500(w, r, fmt.Errorf("BodyUploader: finalize fields failed: %v", err)) return } for k, v := range fields { data.Set(k, v) } // Hijack body body := data.Encode() r.Body = ioutil.NopCloser(strings.NewReader(body)) r.ContentLength = int64(len(body)) r.Header.Set("Content-Type", "application/x-www-form-urlencoded") sft := SavedFileTracker{Request: r} sft.Track("file", fh.LocalPath) if err := sft.Finalize(r.Context()); err != nil { helper.Fail500(w, r, fmt.Errorf("BodyUploader: finalize failed: %v", err)) return } // And proxy the request h.ServeHTTP(w, r) }, "/authorize") }