OZG-6730 return raw file on download

internal/server/handler.go

@@ -45,7 +45,6 @@ const (
 	fileFormKey          = "file"
 	vorgangIdFormKey     = "vorgangId"
 	contentTypeHeaderKey = "Content-Type"
-	contentDispositionHeaderKey = "Content-Disposition"
 	maxFileSizeInMB      = 150
 	fileChunkSizeInByte  = 1024 * 1024
 )
@@ -210,7 +209,10 @@ func getFileHandler(w http.ResponseWriter, r *http.Request, vars map[string]stri
 		return
 	}
 
-	err = writeMultipartResponse(w, fileBuffer)
+	w.Header().Set(contentTypeHeaderKey, "application/octet-stream")
+	w.WriteHeader(http.StatusOK)
+
+	_, err = fileBuffer.WriteTo(w)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
@@ -251,30 +253,6 @@ func fetchFileFromGrpc(ctx context.Context, fileId string, grpcAddress string) (
 	return &fileBuffer, nil
 }
 
-func writeMultipartResponse(w http.ResponseWriter, fileBuffer *bytes.Buffer) error {
-	w.Header().Set(contentTypeHeaderKey, "application/octet-stream")
-	w.Header().Set(contentDispositionHeaderKey, `attachment; filename="file"`)
-	w.WriteHeader(http.StatusOK)
-
-	mw := multipart.NewWriter(w)
-	part, err := mw.CreateFormFile(fileFormKey, fileFormKey)
-	if err != nil {
-		return fmt.Errorf("error creating multipart form file")
-	}
-
-	_, err = fileBuffer.WriteTo(part)
-	if err != nil {
-		return fmt.Errorf("error writing file data to multipart")
-	}
-
-	err = mw.Close()
-	if err != nil {
-		return fmt.Errorf("error closing multipart writer")
-	}
-
-	return nil
-}
-
 func ErrorHandler(ctx context.Context, mux *runtime.ServeMux, marshaler runtime.Marshaler, w http.ResponseWriter, r *http.Request, err error) {
 	st, ok := status.FromError(err)
 	if !ok {