获得文件(s)的metainfo

        :param file_list: 文件路径列表,如 ['/aaa.txt']
        :type file_list: list

        :return: requests.Response
            .. note ::
            示例

            * 文件不存在

            {"errno":12,"info":[{"errno":-9}],"request_id":3294861771}

            * 文件存在
            {
                "errno": 0,

                "info": [

                    {

                        "fs_id": 文件id,

                        "path": "\/\u5c0f\u7c73\/mi2s\u5237recovery.rar",

                        "server_filename": "mi2s\u5237recovery.rar",

                        "size": 8292134,

                        "server_mtime": 1391274570,

                        "server_ctime": 1391274570,

                        "local_mtime": 1391274570,

                        "local_ctime": 1391274570,

                        "isdir": 0,

                        "category": 6,

                        "path_md5": 279827390796736883,

                        "delete_fs_id": 0,

                        "object_key": "84221121-2193956150-1391274570512754",

                        "block_list": [
                            "76b469302a02b42fd0a548f1a50dd8ac"
                        ],

                        "md5": "76b469302a02b42fd0a548f1a50dd8ac",

                        "errno": 0

                    }

                ],

                "request_id": 2964868977

            }

def meta(self, file_list, **kwargs):
        """获得文件(s)的metainfo

        :param file_list: 文件路径列表,如 ['/aaa.txt']
        :type file_list: list

        :return: requests.Response
            .. note ::
            示例

            * 文件不存在

            {"errno":12,"info":[{"errno":-9}],"request_id":3294861771}

            * 文件存在
            {
                "errno": 0,

                "info": [

                    {

                        "fs_id": 文件id,

                        "path": "\/\u5c0f\u7c73\/mi2s\u5237recovery.rar",

                        "server_filename": "mi2s\u5237recovery.rar",

                        "size": 8292134,

                        "server_mtime": 1391274570,

                        "server_ctime": 1391274570,

                        "local_mtime": 1391274570,

                        "local_ctime": 1391274570,

                        "isdir": 0,

                        "category": 6,

                        "path_md5": 279827390796736883,

                        "delete_fs_id": 0,

                        "object_key": "84221121-2193956150-1391274570512754",

                        "block_list": [
                            "76b469302a02b42fd0a548f1a50dd8ac"
                        ],

                        "md5": "76b469302a02b42fd0a548f1a50dd8ac",

                        "errno": 0

                    }

                ],

                "request_id": 2964868977

            }

        """
        if not isinstance(file_list, list):
            file_list = [file_list]
        data = {'target': json.dumps(file_list)}

        return self._request('filemetas?blocks=0&dlink=1', 'filemetas', data=data, **kwargs)