resources.py 文件源码

def get(self, instance_id):
        if not self.is_exist(instance_id):
            abort(404)

        if not self.is_allowed(instance_id):
            abort(403)

        folder_path = thumbnail_utils.get_preview_folder_name(
            self.subfolder,
            instance_id
        )
        file_name = thumbnail_utils.get_file_name(instance_id)

        # Use legacy folder name if the file cannot be found.
        if not os.path.exists(os.path.join(folder_path, file_name)):
            folder_path = thumbnail_utils.get_folder_name("preview-files")

        return send_from_directory(
            directory=folder_path,
            filename=file_name
        )