code: def file_list(self, page_size: int, fields: str, order_by: str, query: str) -> dict:
          
          service = self.__get_service()
          results = service.files().list(
              pageSize=page_size,
              fields=fields,
              orderBy=order_by,
              q=query
          ).execute()
          return results.get('files', [])
docs: Get file list from Google Drive
          :param page_size:
          :param fields:
          :param order_by:
          :param query:
          :return: