4

我在 Angular 4 中设置了两个守卫——一个在用户尝试访问受保护的路由时将用户重定向到登录页面，另一个将用户从“主页”重定向到欢迎页面（如果他们还没有到达那里）。

守卫本身工作得很好……但我注意到一些非常奇怪的行为。在 WelcomeTraveler 守卫中添加重定向this.router.navigate会使应用程序处于我无法从第一个守卫访问受保护路由的状态，即使在登录后也是如此。我只是不断被发送回主页。

这是我的守卫：

export class AuthGuardLoggedInUser implements CanActivate {
  private isLoggedIn: boolean;
  private working: boolean;
  constructor (@Inject(Store) private _store:Store<AppStore>, @Inject(Router) private _router: Router) 
  {
    _store.select(state => state.AuthNState).subscribe(auth =>
    {
      this.isLoggedIn = auth.connected
      this.working = auth.working
    })
  }
  canActivate() {
    if (this.working)
    {
      let promise: Promise<boolean>  = new Promise((resolve, reject) => {
        let sub = this._store.select(state => state.AuthNState).subscribe(auth =>
        {
          if (!auth.working) {
            resolve(auth.connected)
            sub.unsubscribe()
            if (!auth.connected) this._router.navigate(['/i/login']);
          }
        })
      });
      return promise
    }
    else if (this.isLoggedIn){
      return true
    }
    else {
      this._router.navigate(['/i/login']);
    }

export class WelcomeTraveler implements CanActivate {
  private hasAlreadyVisitedWelcomePage: boolean;
  private isLoggedIn: boolean;
  private working: boolean;
  constructor (@Inject(Store) private _store:Store<AppStore>, @Inject(Router) private _router: Router) 
  {
    _store.select(state => state.AuthNState).subscribe(auth =>
    {
      this.isLoggedIn = auth.connected
      this.working = auth.working
    })
  }
  canActivate() {
    if (this.working)
    {
      let promise: Promise<boolean> = new Promise((resolve, reject) => {
        let sub = this._store.select(state => state.AuthNState).subscribe(auth =>
        {
          if (!auth.working) {
            resolve(auth.connected)
            sub.unsubscribe()
            this.hasAlreadyVisitedWelcomePage = true
            this._router.navigate(['/i/welcome']);
          }
        })
      });
      return promise
    }
    else if (this.isLoggedIn){
      return true
    }
    else if (!this.hasAlreadyVisitedWelcomePage){
      this.hasAlreadyVisitedWelcomePage = true
      this._router.navigate(['/i/welcome']);
    }
    else return true
  }
}

这是路由表的片段：

export var AppRoutes = RouterModule.forRoot([
  {
    path: '',
    component: HomeComponent,
    canActivate: [WelcomeTraveler]
  }, {
    path: 'i/getstarted',
    component: GetStartedPageComponent,
    canActivate: [AuthGuardLoggedInUser]
  }, {
    path: 'i/login',
    component: LoginPageComponent
  }, {
    path: 'i/profile',
    component: ProfilePageComponent,
    canActivate: [AuthGuardLoggedInUser]
  }, {
    path: 'i/welcome',
    component: WelcomePageComponent
  }])

this.router.navigate守卫中的存在WelcomeTraveler似乎导致了问题，即使这些线从未被击中！登录后，我在尝试路由到个人资料后立即被送回“家”（成功通过第一个守卫后）。如果我删除导航线 - 问题就会消失。

有任何想法吗？

4

1 回答 1

3

正如经常发生的那样，我在这里走错了路。对于那些可能已经加注星标或投票赞成的人，我建议您检查您可能拥有的任何订阅调用router.navigate- 在我的情况下，我未能在我的登录/注册组件上清理这些订阅......所以订阅初始化后，只要状态更新，我就会被重定向到主页。

像这样固定：

export class LoginPageComponent implements OnDestroy {
   private _redirectSubscription: Subscription;
   constructor (private _store:Store<AppStore>, private router: Router) {
      this._redirectSubscription = _store.select((state) => state.AuthNState).subscribe((auth) =>
      {
        if (auth.connected) this.router.navigate(['']);
      })
   }

   ngOnDestroy() {
     //Called once, before the instance is destroyed.
     //Add 'implements OnDestroy' to the class.
     this._redirectSubscription.unsubscribe();
   }
}
于 2017-10-22T22:35:06.303 回答