AuthGuard example in AngularDart

auth.guard.dart

import 'package:angular_router/angular_router.dart';
import 'package:core/core.dart';
import 'package:web/src/routes.dart';
import 'package:web/src/route_paths.dart';

class AuthGuard implements RouterHook {
  Router _router;
  AuthenticationState _authBlocState;

  set router(Router value) => _router = value;
  set authBlocState(AuthenticationState value) => _authBlocState = value;

  @override
  Future<bool> canActivate(
      Object componentInstance, RouterState current, RouterState next) async {
    if (current.toUrl() != '/login') {
      await _router.navigate('/login');
      print('I Cannot Activate');
      return false;
    }
    print('I Can Activate');
    return true;
  }

  @override
  Future<bool> canNavigate() async {
    print('State $_authBlocState');
    if (_authBlocState is AuthenticationAuthenticated) {
      print('Can Navigate? Yes, it can!');
      print(AppRoutePaths.dashboard.toUrl());
      await _router.navigate(AppRoutePaths.dashboard.toUrl());
      return true;
    }
    print('Can Navigate? No, it cannot!');
    print(AppRoutePaths.login.toUrl());
    await _router.navigate(AppRoutePaths.login.toUrl());
    return false;
  }

  // Implement noSuchMethod(): When a class has a noSuchMethod()
  // it implements any method.
  // Hence, warning "Missing concrete implementation" gets supressed.
  dynamic noSuchMethod(Invocation i) => super.noSuchMethod(i);
}