Question

在我的项目中实施authGuard之前，一切正常。但是，似乎authguard抛出错误。

我从页面上删除了authguard，它正在运行。但随后再次将其添加回给了错误。

App.routing.module.ts

  { path: 'login', loadChildren: './Users/login/login.module#LoginPageModule' },
  { path: 'students/:uName', loadChildren: './Academic/Students/students/students.module#StudentsPageModule',canActivate: [AuthGuard],},
  { path: 'registerclass', loadChildren: './Academic/Students/registerclass/registerclass.module#RegisterclassPageModule',canActivate: [AuthGuard], },
  { path: 'schedule', loadChildren: './Academic/Students/schedule/schedule.module#SchedulePageModule',canActivate: [AuthGuard], },
  { path: 'faculties', loadChildren: './Academic/Faculty/faculties/faculties.module#FacultiesPageModule',canActivate: [AuthGuard], },
  { path: 'addclass', loadChildren: './Academic/Faculty/addclass/addclass.module#AddclassPageModule',canActivate: [AuthGuard], },

auth.guard.ts

import { Injectable } from '@angular/core';
import { CanActivate,ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree,Router } from '@angular/router';
import { Observable } from 'rxjs';
import * as firebase from 'firebase/app'
import 'firebase/auth'


@Injectable({
  providedIn: 'root'
})
export class AuthGuard implements CanActivate {


  constructor(private router: Router) {}

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): boolean | Observable<boolean> | Promise<boolean> {
    return new Promise((resolve, reject) => {
      firebase.auth().onAuthStateChanged((user: firebase.User) => {
        if (user) {
          resolve(true);
        } else {
          console.log('User is not logged in');
          this.router.navigate(['/login']);
          resolve(false);
        }
      });
    });
  }


}// close of class Authguard

app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { RouteReuseStrategy } from '@angular/router';

import { IonicModule, IonicRouteStrategy } from '@ionic/angular';
import { SplashScreen } from '@ionic-native/splash-screen/ngx';
import { StatusBar } from '@ionic-native/status-bar/ngx';

import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';

import { AngularFireModule } from '@angular/fire'; //To initialize firebaseconfig
import { AngularFireAuthModule } from '@angular/fire/auth';
import { AngularFirestoreModule } from '@angular/fire/firestore';

var firebaseConfig = {
  apiKey: "AIzaSyC7f8sjVR-cSeeee3ZbEErwOQReowwpTL0",
  authDomain: "msuproject-74e5a.firebaseapp.com",
  databaseURL: "https://msuproject-74e5a.firebaseio.com",
  projectId: "msuproject-74e5a",
  storageBucket: "msuproject-74e5a.appspot.com",
  messagingSenderId: "748587348290",
  appId: "1:748587348290:web:e10fe4336779cd2ee158db",
  measurementId: "G-GE58MG9QF6"
};
@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    AngularFireModule.initializeApp(firebaseConfig),
    AngularFireAuthModule,
    AngularFirestoreModule
  ],
  providers: [
    StatusBar,
    SplashScreen,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AppModule {}

home.html

<ion-card style="text-align: center; background-color: rgb(19, 4, 4);">
        <nav class="navCard">
            <h1 class="h1Card">
                <a [routerLink]="['/login']">Login</a> |
                <a [routerLink]="['/faculties']">Faculty</a> |
                <a href="https://lib.murraystate.edu/">Library</a> |
                <a href="#">Info</a> 
            </h1>
          </nav>
        </ion-card>

因此，当我单击“教师”时，应该将我带到“教师”页面而不是使页面崩溃。

Answer 1

首先将firebaseconfig对象移动到另一个ts文件，然后在auth.guard.ts内执行以下操作：

import * as config from './config.ts';

let firebaseInit = firebase.initializeApp(config.firebaseConfig);

Answer 2

另一种解决方案使用firebase javascript SDK，但是由于您正在导入AngularFire，因此您也可以使用它。

auth.guard.ts

 constructor(private router: Router,
                private afAuth: AngularFireAuth,
                private ngZone: NgZone) { }

 canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): boolean | Observable<boolean> | Promise<boolean> {
    return new Promise((resolve, reject) => {
      this.afAuth.auth.onAuthStateChanged((user: firebase.User) => this.ngZone.run(() => {
        if (user) {
          resolve(true);
        } else {
          console.log('User is not logged in');
          this.router.navigate(['/login']);
          resolve(false);
        }
      });
    });
  }

我还建议将firebaseConfig移到环境文件中，以便为开发和生产使用不同的文件。

app.module.ts

import { environment } from '../environments/environment';

...
    imports: [
...
AngularFireModule.initializeApp(environment.firebaseConfig),
...

尚未创建Firebase应用程序'[DEFAULT]'-调用Firebase App.initializeApp（）

2 个答案: