处理来自不 return canActivate() 中的布尔值的 Observable 的 HttpErrorResponse

Question

我正在尝试创建一个 canActivate() 函数，它将 :

return false;
this.router.navigateByUrl('/login');

当 401 来自 Observable 的状态代码时，即当 HttpErrorResponse 被引发时。

============================================= =

这是我的服务：

currentUser(token): Observable<any> {
    const url = `${this.BACKEND_URL}/status`;
    const httpOptions = {
        headers: new HttpHeaders({
            'Content-Type': 'application/json',
            'Authorization': `Bearer ${token}`
        })
    };
    return this.http.post(url, {'token': token}, httpOptions);
}

响应数据是一个 Json blob，可以是 401 或 200 状态代码，这是 Python 代码：

post_data = request.get_json()
post_token = post_data.get('token')

resp = User.decode_auth_token(post_token)
if not isinstance(resp, str):
    user = User.query.filter_by(id=resp).first()
    response_object = {
        'status': 'success',
        'data': {
            'user_id': user.id,
            'email': user.email.lower(),
            'first_name': user.first_name,
            'last_name': user.last_name,
            'admin': user.admin,
            'registered_on': user.registered_on
        }
    }
    return make_response(jsonify(response_object)), 200

response_object = {
    'status': 'fail',
    'message': resp
}
return make_response(jsonify(response_object)), 401

我目前有此代码，当状态代码为 401:

时失败并返回 ERROR Error: Uncaught (in promise): HttpErrorResponse

@Injectable()
export class EnsureAuthenticated implements CanActivate {
    constructor(private auth: AuthService, private router: Router) {}
    canActivate(): Observable<boolean> {
        console.log('AUTH');
        return this.auth.currentUser(localStorage.getItem('token')).pipe(map(suc => {
            if (suc.status = 'success') {
                return true;
            } else {
                this.router.navigateByUrl('/login');
                return false;
            }
        }));
    }
}

我正在使用 angular 7.0.4.

Answer 1

答案是使用 catchError 捕捉错误：

import { Injectable } from '@angular/core';
import { CanActivate, Router } from '@angular/router';
import { AuthService } from './auth.service';
import {Observable, of} from 'rxjs';
import {catchError, map} from 'rxjs/operators';
import {HttpErrorResponse} from '@angular/common/http';

@Injectable()
export class EnsureAuthenticated implements CanActivate {
    constructor(private auth: AuthService, private router: Router) {}
    canActivate(): Observable<boolean> {
        return this.auth.currentUser(localStorage.getItem('token')).pipe(map(suc => {
            if (suc.status = 'success') {
                return true;
            } else {
                this.router.navigateByUrl('/login');
                return false;
            }
        }), catchError((err: HttpErrorResponse) => {
            this.router.navigateByUrl('/login');
            return of(false);
        }));
    }
}

Answer 2

这对我有用 returning false 什么都不做，return UrlTree 直接导航到你想去的地方。

canActivate(
        route: ActivatedRouteSnapshot,
        state: RouterStateSnapshot
      ):
        | Observable<boolean | UrlTree>
        | Promise<boolean | UrlTree>
        | boolean
        | UrlTree {
        return this.accountClientService.isLoggedIn().pipe(
          map((responseData: ResponseService<boolean>) => {
            if (responseData.model) {
              return responseData.model;
            }
    
            return this.router.createUrlTree(['/signin']);
          }),
          catchError((err) => {
            return of(this.router.createUrlTree(['/signin']));
          })
        );
      }

处理来自不 return canActivate() 中的布尔值的 Observable 的 HttpErrorResponse

Handle HttpErrorResponse from an Observable that doesn't return a boolean inside a canActivate()

observable

canactivate

angular