Future refresh()

in lib/src/credentials.dart [205:257]

• 44 lines of code
• 12 McCabe index (conditional complexity)

  Future<Credentials> refresh(
      {String? identifier,
      String? secret,
      Iterable<String>? newScopes,
      bool basicAuth = true,
      http.Client? httpClient}) async {
    var scopes = this.scopes;
    if (newScopes != null) scopes = newScopes.toList();
    scopes ??= [];
    httpClient ??= http.Client();

    if (identifier == null && secret != null) {
      throw ArgumentError('secret may not be passed without identifier.');
    }

    var startTime = DateTime.now();
    var tokenEndpoint = this.tokenEndpoint;
    if (refreshToken == null) {
      throw StateError("Can't refresh credentials without a refresh "
          'token.');
    } else if (tokenEndpoint == null) {
      throw StateError("Can't refresh credentials without a token "
          'endpoint.');
    }

    var headers = <String, String>{};

    var body = {'grant_type': 'refresh_token', 'refresh_token': refreshToken};
    if (scopes.isNotEmpty) body['scope'] = scopes.join(_delimiter);

    if (basicAuth && secret != null) {
      headers['Authorization'] = basicAuthHeader(identifier!, secret);
    } else {
      if (identifier != null) body['client_id'] = identifier;
      if (secret != null) body['client_secret'] = secret;
    }

    var response =
        await httpClient.post(tokenEndpoint, headers: headers, body: body);
    var credentials = handleAccessTokenResponse(
        response, tokenEndpoint, startTime, scopes, _delimiter,
        getParameters: _getParameters);

    // The authorization server may issue a new refresh token. If it doesn't,
    // we should re-use the one we already have.
    if (credentials.refreshToken != null) return credentials;
    return Credentials(credentials.accessToken,
        refreshToken: refreshToken,
        idToken: credentials.idToken,
        tokenEndpoint: credentials.tokenEndpoint,
        scopes: credentials.scopes,
        expiration: credentials.expiration);
  }