MM-68439 Centralize filename handling for FileInfo (#36223) (#36255)

Automatic Merge

server/channels/app/upload.go

@@ -23,6 +23,11 @@ import (
 const minFirstPartSize = 5 * 1024 * 1024 // 5MB
 
 func (a *App) genFileInfoFromReader(name string, file io.ReadSeeker, size int64) (*model.FileInfo, error) {
+	name = model.SanitizeFilename(name)
+	if name == "" {
+		return nil, model.NewAppError("genFileInfoFromReader", "app.upload.gen_file_info.invalid_filename.app_error", nil, "", http.StatusBadRequest)
+	}
+
 	ext := strings.ToLower(filepath.Ext(name))
 
 	info := &model.FileInfo{
@@ -276,7 +281,13 @@ func (a *App) UploadData(c request.CTX, us *model.UploadSession, rd io.Reader) (
 	info, genErr := a.genFileInfoFromReader(us.Filename, file, us.FileSize)
 	file.Close()
 	if genErr != nil {
-		return nil, model.NewAppError("UploadData", "app.upload.upload_data.gen_info.app_error", nil, "", http.StatusInternalServerError).Wrap(genErr)
+		var appErr *model.AppError
+		switch {
+		case errors.As(genErr, &appErr):
+			return nil, appErr
+		default:
+			return nil, model.NewAppError("UploadData", "app.upload.upload_data.gen_info.app_error", nil, "", http.StatusInternalServerError).Wrap(genErr)
+		}
 	}
 
 	info.CreatorId = us.UserId