fix: temporarily write blob directly as response body without http.ServeContent

pkg/app/server.go

@@ -132,17 +132,17 @@ func (s *Server) Exec(ctx context.Context, callableOrFuncname any, args ...inter
 		value := result.value
 
 		if promise, ok := IsPromise(value); ok {
-			value = s.waitForPromise(promise)
+			return s.waitForPromise(promise), nil
 		}
 
 		return value.Export(), nil
 	}
 }
 
-func (s *Server) waitForPromise(promise *goja.Promise) goja.Value {
+func (s *Server) waitForPromise(promise *goja.Promise) any {
 	var (
 		wg    sync.WaitGroup
-		value goja.Value
+		value any
 	)
 
 	wg.Add(1)
@@ -162,7 +162,7 @@ func (s *Server) waitForPromise(promise *goja.Promise) goja.Value {
 					return
 				}
 
-				value = promise.Result()
+				value = promise.Result().Export()
 
 				breakLoop = true
 			})

pkg/module/blob/http.go

@@ -2,6 +2,7 @@ package blob
 
 import (
 	"encoding/json"
+	"io"
 	"io/fs"
 	"mime/multipart"
 	"net/http"
@@ -164,7 +165,14 @@ func handleAppDownload(w http.ResponseWriter, r *http.Request) {
 		}
 	}()
 
-	http.ServeContent(w, r, string(replyMessage.BlobInfo.ID()), replyMessage.BlobInfo.ModTime(), replyMessage.Blob)
+	// TODO Fix usage of ServeContent
+	// http.ServeContent(w, r, string(replyMessage.BlobInfo.ID()), replyMessage.BlobInfo.ModTime(), replyMessage.Blob)
+
+	w.Header().Add("Content-Type", replyMessage.BlobInfo.ContentType())
+
+	if _, err := io.Copy(w, replyMessage.Blob); err != nil {
+		logger.Error(ctx, "could not write blob", logger.CapturedE(errors.WithStack(err)))
+	}
 }
 
 type uploadedFile struct {