getFile method

Future<File> getFile(String fileId)

Use this method to get basic info about a file and prepare it for downloading

For the moment, bots can download files of up to 20MB in size. On success, a File object is returned. The file can then be downloaded via the link https://api.telegram.org/file/bot<token>/<file_path>, where <file_path> is taken from the response. It is guaranteed that the link will be valid for at least 1 hour. When the link expires, a one can be requested by calling getFile again.

Note: This function may not preserve the original file name and MIME type. You should save the file's MIME type and name (if available) when the File object is received.

https://core.telegram.org/bots/api#getfile

Implementation

Future<File> getFile(String fileId) async {
  var requestUrl = _apiUri('getFile');
  var body = <String, dynamic>{'file_id': fileId};
  return File.fromJson(await HttpClient.httpPost(requestUrl, body: body));
}