Question

我目前正在使用spring boot作为后端实现angular2示例应用程序。我在前端保护机制和可观察性方面遇到了一些问题。

我正在努力实现：

当有人进入受保护路线时，认证警卫应检查用户是否已在auth服务变量中设置
如果未设置，则应发出http请求以检查会话是否可用
service方法应返回true / false值（由于可能的http请求而异步）
如果服务返回false，则auth guard应重定向到登录页面
auth guard应返回true / false，以便路由可以激活或不激活

我的代码目前看起来像这样（我正在使用RC5顺便说一句。）：

Auth Guard

import {Injectable} from "@angular/core";
import {CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, Router} from "@angular/router";
import {Observable, Subject} from "rxjs/Rx";
import {AuthService} from "./auth.service";

@Injectable()
export class AuthGuard implements CanActivate {
  constructor(private authService: AuthService, private router: Router) {}

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> | boolean {
    var authenticated = this.authService.isAuthenticated();
    var subject = new Subject<boolean>();
    authenticated.subscribe(
        (res) => {
          console.log("onNext guard: "+res);
          if(!res && state.url !== '/signin') {
            console.log("redirecting to signin")
            this.router.navigate(['/signin']);
          }
          subject.next(res);
        });
    return subject.asObservable();
  }
}

验证服务

import {Injectable} from "@angular/core";
import {User} from "./user.interface";
import {Router} from "@angular/router";
import {Http, Response, Headers} from "@angular/http";
import {environment} from "../environments/environment";
import {Observable, Observer, Subject} from "rxjs/Rx";

@Injectable()
export class AuthService {
  private authenticatedUser : User;
  constructor(private router: Router, private http: Http) {}

  signupUser(user: User) {
  }


  logout() {
    //do logout stuff
    this.router.navigate(['/signin']);
  }

  isAuthenticated() : Observable<boolean> {
    var subject = new Subject<boolean>();
    if (this.authenticatedUser) {
      subject.next(true);
    } else {
      this.http.get(environment.baseUrl + '/user')
        .map((res : Response) => res.json())
        .subscribe(res => {
          console.log("next: returning true");
          this.authenticatedUser = User.ofJson(res);
          subject.next(true);
        }, (res) => {
          console.log("next: returning false");
          subject.next(false);
        });
    }
    return subject.asObservable();
  }
}

问题是：即使我已登录，警卫也不会允许路由器组件激活。

感谢您的帮助！

Answer 1

更改

return subject.asObservable();

到

return subject.asObservable().first();

路由器等待observable完成。 first()在第一次活动结束后完成。

具有http请求和可观察量的Angular2 auth防护

1 个答案: