serializers.py 文件源码

def _generate_image_filename(self, url_path, file):
        if callable(self._image_upload_to):
            raise Exception('Callable upload_to fields are not supported')

        root_path, extension = posixpath.splitext(url_path)
        if file:
            # Workaround: imghdr expects the files position on 0
            file.seek(0)
            extension = imghdr.what(file) or 'jpeg'

        basename = posixpath.basename(root_path)
        if not basename:
            basename = 'bplan'

        dirname = datetime.datetime.now().strftime(self._image_upload_to)
        filename = posixpath.join(dirname, basename + '.' + extension)

        return self._image_storage.get_available_name(filename)