fix: handle missing expected err cases

apps/backend/internal/upload/err.go

@@ -6,4 +6,5 @@ var (
 	ErrNotFound           = errors.New("not found")
 	ErrParentNotDirectory = errors.New("parent is not a directory")
 	ErrConflict           = errors.New("node conflict")
+	ErrContentNotUploaded = errors.New("content has not been uploaded")
 )

apps/backend/internal/upload/http.go

@@ -55,6 +55,12 @@ func (h *HTTPHandler) Create(c *fiber.Ctx) error {
 		if errors.Is(err, ErrNotFound) {
 			return c.SendStatus(fiber.StatusNotFound)
 		}
+		if errors.Is(err, ErrParentNotDirectory) {
+			return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Parent is not a directory"})
+		}
+		if errors.Is(err, ErrConflict) {
+			return c.Status(fiber.StatusConflict).JSON(fiber.Map{"error": "A file with this name already exists"})
+		}
 		return httperr.Internal(err)
 	}
 
@@ -102,6 +108,9 @@ func (h *HTTPHandler) Update(c *fiber.Ctx) error {
 			if errors.Is(err, ErrNotFound) {
 				return c.SendStatus(fiber.StatusNotFound)
 			}
+			if errors.Is(err, ErrContentNotUploaded) {
+				return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "Content has not been uploaded"})
+			}
 			return httperr.Internal(err)
 		}
 		return c.JSON(upload)

apps/backend/internal/upload/service.go

@@ -131,6 +131,9 @@ func (s *Service) CompleteUpload(ctx context.Context, db bun.IDB, accountID uuid
 
 	err := s.vfs.WriteFile(ctx, db, upload.TargetNode, virtualfs.FileContentFromBlobKey(upload.TargetNode.BlobKey))
 	if err != nil {
+		if errors.Is(err, blob.ErrNotFound) {
+			return nil, ErrContentNotUploaded
+		}
 		return nil, err
 	}