Flutter retry mechanism for getting user token

getHeader.dart

Future<Map<String, String>?>? getHeader() async {
    final authenticated = auth.user != null;
    if (!authenticated) {
      return null;
    }
    var currentToken = await auth.user!.getIdToken();
    var decodedToken = JwtDecoder.decode(currentToken!);
    var retryTimes = 0;
    while (decodedToken['https://hasura.io/jwt/claims'] == null &&
        retryTimes < 10) {
      logger.info('force refresh token');
      await Future.delayed(const Duration(milliseconds: 2500));
      currentToken = await auth.user!.getIdToken(true);
      decodedToken = JwtDecoder.decode(currentToken!);
      retryTimes++;
    }
    return {
      'Authorization': 'Bearer $currentToken',
    };
  }