Angular2：使用 AuthGuard 路由重定向

Question

我有一个 Angular2 应用程序，如果用户未登录，它应该阻止到某个页面的路由。这是我的 app.routes 文件

export const routes: Routes = [
  { path: '', component: LoginComponent },
  { path: 'login', component: LoginComponent },
  { path: 'home', component: HomeComponent, canActivate: [AuthGuard] },
  { path: '**', component: LoginComponent },
];

和我的 AuthGuard 文件

@Injectable()
export class AuthGuard implements CanActivate {
response: ResponseInterface;

constructor(private router: Router, private localStorage: LocalStorageService,
 private services: MyService) { }
canActivate() {

let token = String(this.localStorage.get('token'));
if (token != null) {
  this.services.keepAlive(token).subscribe(
    response => this.response = response,
    error => alert(error),
    () => {
      if (this.response.status == 'OK') {
        console.log("response OK");
        return true;
      } else {
        console.log("response KO");
        this.router.navigate(['/login']);
        return false;
      }
    }
  )

} else {
  this.router.navigate(['/login']);
  return false;
}

现在，如果我尝试导航到 http://localhost:4200/#/home path and I already have a token stored into localStorage, nothing happen: home page is not showed and path on navigation bar become http://localhost:4200/#/。怎么了？

Answer 1

canActive 方法应该 return Observable<boolean>、Promise<boolean> 或 boolean。

您正在订阅 this.services.keepAlive Observable，并且 returning boolean 值到订阅回调而不是 returning 到 canActivate 方法。更改您的代码如下：

canActivate(): Observable<boolean> | Promise<boolean> | boolean {
    let token = String(this.localStorage.get('token'));
    if (token != null) {
        return this.services.keepAlive(token)
            .map(response => {
                if (response.status == 'OK') {
                    console.log("response OK");
                    return true;
                } else {
                    console.log("response KO");
                    this.router.navigate(['login']);
                    return false;
                }
            });
    } else {
        this.router.navigate(['login']);
        return false;
    }
}

这样，布尔类型 (Observable<boolean>) 的 Observable 将 returned 到 canActive 方法，并且路由解析应该按预期工作。

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