read method

@override Future<AtKeys> read(String atsign)

Implementation

@override
Future<AtKeys> read(String atsign) async {
  final file = File(filePath!(atsign));
  if (!file.existsSync()) {
    // Typed, so a caller can tell "no keyfile yet" from "a keyfile this
    // process cannot read". Both used to arrive as a bare AtException and
    // the only way to separate them was the message text.
    throw AtKeysSourceAbsentException(
        'provided keys file does not exist. Please check whether the file path ${file.path} is valid');
  }

  final json = await _readAtRestDocument(file);
  final plaintextJson = await _selfDecryptLegacyFields(json);
  return AtKeys.fromJson(plaintextJson);
}