Google authentication in firebase showing blank screen Progressive Web App

Question

I am on the way to create my first Progressive web app which uses firebase for storing data. I am also using Gmail as an entry point for all the users that would us

Answer 1

I had almost same behavior on my pet web app. For my self I solve it by the next steps:

1. I move firebase initialization to the app.module.ts

@NgModule({
    ...
    providers: [
        { provide: APP_INITIALIZER, useFactory: appConfig, deps: [AuthService], multi: true }
    ]
})

export function appConfig(authService) {
    const app = firebase.initializeApp({
        apiKey
        authDomain
    });
    return () => new Promise((resolve, reject) => {
        firebase.auth()
        .onAuthStateChanged(data => {
            if (data) {
              firebase.auth().currentUser.getToken()
                .then((token: string) => authService.setToken(token););
            }
            resolve(true);
        }, error => resolve(true));
    });
}

2. Redirection to LoginPage I managed in auth.guard.ts

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

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
        if (this.authService.isAuthenticated()) {
            return true;
        } else {
            this.router.navigate(['/signin']);
            return false;
        }
    }
}

3. I had the next code in my auth.service.ts

export class AuthService {
    token: string;

    signinUser(email: string, password: string) {
        return new Promise((resolve, reject) => {
            firebase.auth().signInWithEmailAndPassword(email, password)
                .then(resp => {
                    firebase.auth().currentUser.getToken()
                        .then((token: string) => {
                            this.token = token;
                            resolve(resp);
                        }).catch(reject);
                    return resp;
                })
                .catch(reject);
            });
    }

    signoutUser() {
        return firebase.auth().signOut()
            .then(resp => this.token = null);
    }

    getToken() {
        firebase.auth().currentUser.getToken()
            .then((token: string) => this.setToken(token));
        return this.token;
    }
    
    setToken(token) {
      this.token = token;
    }

    isAuthenticated() {
        return this.token != null;
    }
}

I hope it will be helpful for you.