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Angular 2 - Angularfire 2 身份验证状态

转载 作者:太空狗 更新时间:2023-10-29 18:08:58 24 4
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我迷失在 observables、promises 和 state 的疯狂中。我需要帮助来解决这个问题。

我正在尝试使用 Angularfire2 模块在我的 Angular 2 应用程序中实现注册/登录/注册功能。我从登录功能开始。我得到了基本的工作。我可以登录并重定向到新页面。到目前为止,一切都很好。在我的模板中,我正在检查用户是否登录。麻烦就在这里开始了。我很难检查当前用户是否登录。

Login.components.ts

import { Component, OnInit } from '@angular/core';
import {Validators, FormGroup, FormBuilder } from '@angular/forms';
import { AuthService } from '../auth.service';
import {Router} from '@angular/router';

@Component({
selector: 'app-login',
templateUrl: './login.component.html',
styleUrls: ['./login.component.css']
})
export class LoginComponent implements OnInit {

form: FormGroup;
error = false;
errorMessage = '';

constructor(private fb:FormBuilder, private authService:AuthService, private router:Router) {}

ngOnInit() {
this.form = this.fb.group({
email: ['', Validators.required],
password: ['', Validators.required]
});
}

onLogin() {
this.authService.loginUser(this.form.value.email, this.form.value.password)
.subscribe(
() => this.router.navigate(['/'])
)
}

}

Auth.service.ts

import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import {FirebaseAuth} from 'angularfire2/index';
import {Observable, Subject} from 'rxjs/Rx';

@Injectable()
export class AuthService {

constructor(private auth: FirebaseAuth, private router:Router) { }

loginUser(email, password):Observable<any> {
return this.fromFirebaseAuthPromise(this.auth.login({email,password}));
}

logout() {
this.auth.logout();
this.router.navigate(['/']);
}

fromFirebaseAuthPromise(promise):Observable<any> {
const subject = new Subject<any>();
promise
.then(res => {
subject.next(res);
subject.complete();
},
err => {
subject.error(err);
subject.complete();
});
return subject.asObservable();
}


isAuthenticated(): Observable<any> {
const state = new Subject<any>();

this.auth.subscribe( (user) => {
if (user) {
var uid = user.uid;
console.log('the user id:' + uid)
state.next(true)
} else {
console.log("no user")
state.next(false)
}
})

return state.asObservable();
}
}

home.component.ts

import { Component, OnInit } from '@angular/core';
import { AuthService } from './auth/auth.service';
import { AuthInfo } from './auth/auth-info';

@Component({
selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.css']
})
export class HomeComponent implements OnInit {

isAuthenticated = false;

constructor(private authService:AuthService) {
this.authService.isAuthenticated().subscribe(
authStatus => this.isAuthenticated = authStatus
);
console.log('isAuthenticated:' + this.isAuthenticated);
}

isAuth() {
return this.isAuthenticated;
}

onLogout() {
this.authService.logout();
}

ngOnInit() {

}
}

home.component.html

<h2>
Please login or register to use the app
</h2>

<a [routerLink]="['/login']" *ngIf="!isAuth()">Login here</a>
<a [routerLink]="['/register']" *ngIf="!isAuth()">Register here</a>

<a *ngIf="isAuth()" (click)="onLogout()" style="cursor: pointer;">Logout</a>

当我在登录时查看我的控制台时,我看到以下结果。

{  
the user: id:qqsrQHB0SyeIQTbri6sYEyTTE9r2
isAuthenticated: false
}

所以我想登录一定要成功吧?但是当我检查身份验证是否为真时,似乎失败了。 HomeComponent 中的 *ngIf="!isAuth()"不起作用,只有当我在浏览器中进行硬刷新时才会起作用。

硬刷新后,我仍然在控制台中看到:

{  
the user: id:qqsrQHB0SyeIQTbri6sYEyTTE9r2
isAuthenticated: false
}

最佳答案

你的代码太复杂了,你的代码应该是这样的:

授权服务

import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { FirebaseAuth } from 'angularfire2/index';
import { Observable } from 'rxjs/Rx';

@Injectable()
export class AuthService {

constructor(private auth: FirebaseAuth, private router:Router) { }

loginUser(email, password) {
return this.auth.login({email,password}) //angularfire returns a promise
}

loginUserObservable(email,password){ //but if still want to use an observable
return Observable.fromPromise(<Promise<any>> this.auth.login({email,password})) // we need to cast the Promise because for some reason Angularfire returns firebase.Promise
}

logout() {
this.auth.logout();
this.router.navigate(['/']);
}

isAuthenticated(): Observable<any> {
return this.auth; //auth is already an observable
}
}

home.component.ts:

import { Component, OnDestroy, OnInit } from '@angular/core';
import { AuthService } from './auth/auth.service';
import { AuthInfo } from './auth/auth-info';
import { Subscription } from 'rxjs/Subscription';

@Component({
selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.css']
})
export class HomeComponent implements OnInit, OnDestroy {
private sub: Subscription;

constructor(private authService:AuthService) { }

ngOnInit() {
this.sub = this.authService.isAuthenticated().subscribe(authResp =>
console.log('isAuthenticated: ', authResp);
);
}

ngOnDestroy() {
this.sub.unsubscribe();
}

isAuth() {
return this.authService.isAuthenticated();
}

onLogout() {
this.authService.logout();
}
}

home.component.html

<h2>
Please login or register to use the app
</h2>

<a [routerLink]="['/login']" *ngIf="!(isAuth() | async)">Login here</a>
<a [routerLink]="['/register']" *ngIf="!(authService.isAuthenticated() | async)">Register here</a>
<!--you can either use !(isAuth() | async) or !(authService.isAuthenticated() | async) it's up to your religion -->

<a *ngIf="isAuth() | async" (click)="onLogout()" style="cursor: pointer;">Logout</a>

我建议您阅读此 simple guide

关于Angular 2 - Angularfire 2 身份验证状态,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40263091/

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