authenticateViaPopup method

@override Stream<String> authenticateViaPopup(String url, { String eventName = 'token', String? errorMessage, })

Opens the url in a new window, and returns a Stream that will fire a JWT on successful authentication.

Implementation

@override
Stream<String> authenticateViaPopup(
  String url, {
  String eventName = 'token',
  String? errorMessage,
}) {
  var ctrl = StreamController<String>();
  var wnd = window.open(url, 'angel_client_auth_popup');
  Timer? timer;
  late JSFunction listener;

  void done() {
    timer?.cancel();
    window.removeEventListener(eventName, listener);
    ctrl.close();
  }

  // The token, of the event the popup fires on this window.
  listener = ((Event e) {
    if (ctrl.isClosed) return;
    ctrl.add((e as CustomEvent).detail.toString());
    done();
  }).toJS;
  window.addEventListener(eventName, listener);

  timer = Timer.periodic(Duration(milliseconds: 500), (_) {
    if (ctrl.isClosed) return;
    if (wnd != null && wnd.closed) {
      ctrl.addError(
        AngelHttpException.notAuthenticated(
          message: errorMessage ?? 'Authentication via popup window failed.',
        ),
      );
      done();
    }
  });

  return ctrl.stream;
}