Future handleAuthorizationResponse()

in lib/src/authorization_code_grant.dart [230:263]
31 lines of code
9 McCabe index (conditional complexity)

  Future<Client> handleAuthorizationResponse(
      Map<String, String> parameters) async {
    if (_state == _State.initial) {
      throw StateError('The authorization URL has not yet been generated.');
    } else if (_state == _State.finished) {
      throw StateError('The authorization code has already been received.');
    }
    _state = _State.finished;

    if (_stateString != null) {
      if (!parameters.containsKey('state')) {
        throw FormatException('Invalid OAuth response for '
            '"$authorizationEndpoint": parameter "state" expected to be '
            '"$_stateString", was missing.');
      } else if (parameters['state'] != _stateString) {
        throw FormatException('Invalid OAuth response for '
            '"$authorizationEndpoint": parameter "state" expected to be '
            '"$_stateString", was "${parameters['state']}".');
      }
    }

    if (parameters.containsKey('error')) {
      var description = parameters['error_description'];
      var uriString = parameters['error_uri'];
      var uri = uriString == null ? null : Uri.parse(uriString);
      throw AuthorizationException(parameters['error']!, description, uri);
    } else if (!parameters.containsKey('code')) {
      throw FormatException('Invalid OAuth response for '
          '"$authorizationEndpoint": did not contain required parameter '
          '"code".');
    }

    return await _handleAuthorizationCode(parameters['code']);
  }