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Jacob Banks

Jacob Banks

4 years ago

Building Angular 9 Authentication System from scratch using Firebase

In this Angular tutorial, we are going to build full Angular 9 Firebase Authentication system from scratch using Firebase Real-time NoSQL cloud database.

What We’ll Be Creating?

  • Sign in with Google
  • Sign in with username/password
  • Sign up with username/password
  • Recover forget password
  • Send email verification to a newly created user
  • Protect app’s inner pages URL using route guard’s canActivate method
  • Prevent user to access sign in and sign up URL when a user is already logged in
  • Maintain logged in state of Firebase user in localStorage

Step by step Explanation

  • Technologies used
  • Prerequisite
  • Firebase account set up and AngularFire2 library integration
  • Generate required Angular components
  • Setup router service for navigating between components
  • Create firebase authentication service using Firebase API
  • Create Sign in authentication service using AuthService API
  • Create sign in with Username/Password
  • Create sign in with Google
  • Create sign in with Facebook
  1. Create Firebase sign up service using Firebase API in Angular 7|8|9
  2. Create Firebase forgot password service using Firebase API in Angular 7|8|9
  3. How to send email Verification using Firebase API in Angular 7|8|9?
  4. How to use CanActivate method to prevent Access of URLs in Angular 7 app using route guards?
  5. How to maintain logged in state of Firebase user in localStorage with Angular 7|8|9?

1. Technologies used

  • Node 8.11.1
  • Angular 7|8|9
  • Firebase 5.7.0
  • RxJS 6.3.3
  • Typescript 3.1.6

2. Prerequisite

– Setup Node JS development environment

Before we move ahead I’m assuming you already have Node JS development environment set up in your system.

Please follow this link How to Set up Node JS Development Environment?

– Install Angular CLI

Install Angular CLI, Ignore if Angular CLI is already installed.

npm install -g @angular/cli

– Angular 7|8|9 Project Set up

Use the given below cmd to setup the Angular project.

ng new angularfiebase-authentication

Once the project is downloaded, get into the project directory.

cd angularfirebase-authentication

Congrats! You are in your project directory.

For the demo purpose, we’ll be using Bootstrap4, use the given below command to install Bootstrap4 in your project.

npm install bootstrap

Go to angular.json file and replace the given below code with “styles”: [ ] array.

"styles": [
            "node_modules/bootstrap/dist/css/bootstrap.min.css",
            "src/styles.css"
          ]

Run the following command to start your project.

ng serve --open

3. Firebase Account Set up and AngularFire2 Library Integration

I assume you have already created a basic project in Firebase account

How to include Firebase AngularFire2 library in your Angular app?

Include AngularFire2 library in your Angular 7|8|9 app from Node Package Manager(NPM).

Run the given below command using Angular CLI.

npm install firebase @angular/fire --save

Once the AngularFire2 library included in the app then go to src/app/app.module.ts file and add the given below code.

// Firebase services + enviorment module
import { AngularFireModule } from "@angular/fire";
import { AngularFireAuthModule } from "@angular/fire/auth";
import { AngularFirestoreModule } from '@angular/fire/firestore';
import { environment } from '../environments/environment';

@NgModule({
  imports: [
    AngularFireModule.initializeApp(environment.firebase),
    AngularFireAuthModule,
    AngularFirestoreModule,
  ]
})

4. Generate Required Angular Components

In order to create a complete Angular 7|8|9 Firebase Authentication system, we are required to generate components, services, route guards, routing services etc.

Generate Components for Angular Firebase Authentication System App

ng g c components/dashboard

ng g c components/sign-in

ng g c components/sign-up

ng g c components/forgot-password

ng g c components/verify-email

5. Setup Router Service for Navigating between Components

Create Angular router service for navigating between components in Auth app. When we initially create a new project using Angular CLI. Angular CLI asks to create routing service where you have to simply choose yes and hit enter.

Digambers-MacBook-Pro:Desktop digambersingh$ ng new angularfirebase-authentication
? Would you like to add Angular routing? (y/N)

This will create src/app-routing.module.ts file. In our project, we have kept this file in the src/shared/routing/app-routing.module.ts folder for the better manageability purpose.

Go to src/shared/routing/app-routing.module.ts file, paste the given below code for creating navigation service in your Angular Firebase authentication system app.

import { NgModule } from '@angular/core';
// Required services for navigation
import { Routes, RouterModule } from '@angular/router';

// Import all the components for which navigation service has to be activated 
import { SignInComponent } from '../../components/sign-in/sign-in.component';
import { SignUpComponent } from '../../components/sign-up/sign-up.component';
import { DashboardComponent } from '../../components/dashboard/dashboard.component';
import { ForgotPasswordComponent } from '../../components/forgot-password/forgot-password.component';
import { AuthGuard } from "../../shared/guard/auth.guard";
import { VerifyEmailComponent } from '../../components/verify-email/verify-email.component';

const routes: Routes = [
  { path: '', redirectTo: '/sign-in', pathMatch: 'full' },
  { path: 'sign-in', component: SignInComponent },
  { path: 'register-user', component: SignUpComponent },
  { path: 'dashboard', component: DashboardComponent },
  { path: 'forgot-password', component: ForgotPasswordComponent },
  { path: 'verify-email-address', component: VerifyEmailComponent }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})

export class AppRoutingModule { }

Go to app.module.ts file and include app routing service and also include in imports array like given below.

// App routing modules
import { AppRoutingModule } from './shared/routing/app-routing.module';

@NgModule({
  declarations: [...],
  imports: [
    AppRoutingModule
  ],
  providers: [...],
  bootstrap: [...]
})

6. Create Firebase Authentication Service using Firebase API

Generate auth service and user interface files to create a Firebase authentication system with Angular 7|8|9.

– Create user.ts file

ng generate interface shared/services/user

Go to shared/services/user.ts
This user interface class will hold the data types of the User class.

export interface User {
   uid: string;
   email: string;
   displayName: string;
   photoURL: string;
   emailVerified: boolean;
}

– Create auth.service.ts file

This file holds the core logic of our authentication system. I’ll be covering up social login using Firebase’s Google auth provider. You can also create the login with Facebook, Twitter, and GitHub later on by following the same method.

I am also going to cover up the sign in and sign up using username/password, reset forgot password, email verification, route protection using canActivate auth guard method.

import { Injectable, NgZone } from '@angular/core';
import { User } from "../services/user";
import { auth } from 'firebase/app';
import { AngularFireAuth } from "@angular/fire/auth";
import { AngularFirestore, AngularFirestoreDocument } from '@angular/fire/firestore';
import { Router } from "@angular/router";

@Injectable({
  providedIn: 'root'
})

export class AuthService {
  userData: any; // Save logged in user data

  constructor(
    public afs: AngularFirestore,   // Inject Firestore service
    public afAuth: AngularFireAuth, // Inject Firebase auth service
    public router: Router,  
    public ngZone: NgZone // NgZone service to remove outside scope warning
  ) {    
    /* Saving user data in localstorage when 
    logged in and setting up null when logged out */
    this.afAuth.authState.subscribe(user => {
      if (user) {
        this.userData = user;
        localStorage.setItem('user', JSON.stringify(this.userData));
        JSON.parse(localStorage.getItem('user'));
      } else {
        localStorage.setItem('user', null);
        JSON.parse(localStorage.getItem('user'));
      }
    })
  }

  // Sign in with email/password
  SignIn(email, password) {
    return this.afAuth.auth.signInWithEmailAndPassword(email, password)
      .then((result) => {
        this.ngZone.run(() => {
          this.router.navigate(['dashboard']);
        });
        this.SetUserData(result.user);
      }).catch((error) => {
        window.alert(error.message)
      })
  }

  // Sign up with email/password
  SignUp(email, password) {
    return this.afAuth.auth.createUserWithEmailAndPassword(email, password)
      .then((result) => {
        /* Call the SendVerificaitonMail() function when new user sign 
        up and returns promise */
        this.SendVerificationMail();
        this.SetUserData(result.user);
      }).catch((error) => {
        window.alert(error.message)
      })
  }

  // Send email verfificaiton when new user sign up
  SendVerificationMail() {
    return this.afAuth.auth.currentUser.sendEmailVerification()
    .then(() => {
      this.router.navigate(['verify-email-address']);
    })
  }

  // Reset Forggot password
  ForgotPassword(passwordResetEmail) {
    return this.afAuth.auth.sendPasswordResetEmail(passwordResetEmail)
    .then(() => {
      window.alert('Password reset email sent, check your inbox.');
    }).catch((error) => {
      window.alert(error)
    })
  }

  // Returns true when user is looged in and email is verified
  get isLoggedIn(): boolean {
    const user = JSON.parse(localStorage.getItem('user'));
    return (user !== null && user.emailVerified !== false) ? true : false;
  }

  // Sign in with Google
  GoogleAuth() {
    return this.AuthLogin(new auth.GoogleAuthProvider());
  }

  // Auth logic to run auth providers
  AuthLogin(provider) {
    return this.afAuth.auth.signInWithPopup(provider)
    .then((result) => {
       this.ngZone.run(() => {
          this.router.navigate(['dashboard']);
        })
      this.SetUserData(result.user);
    }).catch((error) => {
      window.alert(error)
    })
  }

  /* Setting up user data when sign in with username/password, 
  sign up with username/password and sign in with social auth  
  provider in Firestore database using AngularFirestore + AngularFirestoreDocument service */
  SetUserData(user) {
    const userRef: AngularFirestoreDocument<any> = this.afs.doc(`users/${user.uid}`);
    const userData: User = {
      uid: user.uid,
      email: user.email,
      displayName: user.displayName,
      photoURL: user.photoURL,
      emailVerified: user.emailVerified
    }
    return userRef.set(userData, {
      merge: true
    })
  }

  // Sign out 
  SignOut() {
    return this.afAuth.auth.signOut().then(() => {
      localStorage.removeItem('user');
      this.router.navigate(['sign-in']);
    })
  }

}

After that, go to src/app.module.ts file and import authentication service and pass the AuthService class into providers: [AuthService] array. By doing this our authentication service will be available throughout the application.

// Auth service
import { AuthService } from "./shared/services/auth.service";

@NgModule({
  declarations: [...],
  imports: [...],
  providers: [AuthService],
  bootstrap: [...]
})

7. Create Sign in Authentication Service using AuthService API

It’s time to consume custom AuthService API, we’ll be consuming following services using AuthService API.

  • Create Sign in with Username and Password
  • Create Sign in with Google
  • Create Sign in with Facebook

In order to consume custom API from AuthService class we need to import AuthService class into src/app/components/sign-in/sign-in.component.ts file and then inject AuthService class into the constructor so that these services will be available throughout the same template.

Go to src/app/components/sign-in/sign-in.component.ts file and paste the following code.

import { Component, OnInit } from '@angular/core';
import { AuthService } from "../../shared/services/auth.service";

@Component({
  selector: 'app-sign-in',
  templateUrl: './sign-in.component.html',
  styleUrls: ['./sign-in.component.css']
})

export class SignInComponent implements OnInit {

  constructor(
    public authService: AuthService
  ) { }

  ngOnInit() { }

}

We’ve already generated our components, go to src/app/components/sign-in/sign-in.component.html file and paste the following code.

<div class="displayTable">
  <div class="displayTableCell">

    <div class="authBlock">
      <h3>Sign In</h3>
      <div class="formGroup">
        <input type="text" class="formControl" placeholder="Username" #userName required>
      </div>

      <div class="formGroup">
        <input type="password" class="formControl" placeholder="Password" #userPassword required>
      </div>

      <!-- Calling SignIn Api from AuthService -->
      <div class="formGroup">
        <input type="button" class="btn btnPrimary" value="Log in" (click)="authService.SignIn(userName.value, userPassword.value)">
      </div>

      <div class="formGroup">
        <span class="or"><span class="orInner">Or</span></span>
      </div>

      <!-- Calling GoogleAuth Api from AuthService -->
      <div class="formGroup">
        <button type="button" class="btn googleBtn" (click)="authService.GoogleAuth()">
          <i class="fab fa-google-plus-g"></i>
          Log in with Google
        </button>
      </div>

      <div class="forgotPassword">
        <span routerLink="/forgot-password">Forgot Password?</span>
      </div>
    </div>

    <div class="redirectToLogin">
      <span>Don't have an account?<span class="redirect" routerLink="/register-user"> Sign Up</span></span>
    </div>

  </div>
</div>

8. How to Create Firebase Sign up Service using Firebase API in Angular 7|8|9?

In this section, I am going to share with you, how to create Firebase sign up service using Firebase API in Angular 7|8|9?

Go to src/app/components/sign-up/sign-up.component.ts file and add the following code.

import { Component, OnInit } from '@angular/core';
import { AuthService } from "../../shared/services/auth.service";

@Component({
  selector: 'app-sign-up',
  templateUrl: './sign-up.component.html',
  styleUrls: ['./sign-up.component.css']
})

export class SignUpComponent implements OnInit {

  constructor(
    public authService: AuthService
  ) { }

  ngOnInit() { }

}

Go to src/app/components/sign-up/sign-up.component.html file and add the following code.

<div class="displayTable">
  <div class="displayTableCell">

    <div class="authBlock">
      <h3>Sign Up</h3>

      <div class="formGroup">
        <input type="email" class="formControl" placeholder="Email Address" #userEmail required>
      </div>

      <div class="formGroup">
        <input type="password" class="formControl" placeholder="Password" #userPwd required>
      </div>

      <div class="formGroup">
        <input type="button" class="btn btnPrimary" value="Sign Up" (click)="authService.SignUp(userEmail.value, userPwd.value)">
      </div>

      <div class="formGroup">
        <span class="or"><span class="orInner">Or</span></span>
      </div>

      <!-- Continue with Google -->
      <div class="formGroup">
        <button type="button" class="btn googleBtn" (click)="authService.GoogleAuth()">
          <i class="fab fa-google-plus-g"></i>
          Continue with Google
        </button>
      </div>

      <!-- Continue with Facebook -->
      <div class="formGroup">
        <button type="button" class="btn facebookBtn" (click)="authService.FacebookAuth()">
          <i class="fab fa-facebook"></i>
          Continue with Facebook
        </button>
      </div>
    </div>

    <div class="redirectToLogin">
      <span>Already have an account? <span class="redirect" routerLink="/sign-in">Log In</span></span>
    </div>
  </div>

</div>

9. How to Create Firebase Forgot Password Service using Firebase API in Angular 7|8|9?

We are going to create Firebase forgot password service using Firebase API in Angular 7|8|9 using our custom made AuthService API.

Go to src/app/components/forgot-password/forgot-password.component.ts add the following code.

import { Component, OnInit } from '@angular/core';
import { AuthService } from "../../shared/services/auth.service";

@Component({
  selector: 'app-forgot-password',
  templateUrl: './forgot-password.component.html',
  styleUrls: ['./forgot-password.component.css']
})

export class ForgotPasswordComponent implements OnInit {

  constructor(
    public authService: AuthService
  ) { }

  ngOnInit() {
  }

}

Go to src/app/components/forgot-password/forgot-password.component.html add the following code.

<div class="displayTable">
  <div class="displayTableCell">
    <div class="authBlock">
      <h3>Reset Password</h3>

      <p class="text-center">Please enter your email address to request a password reset.</p>

      <div class="formGroup">
        <input type="email" class="formControl" placeholder="Email Address" #passwordResetEmail required>
      </div>

      <!-- Calling ForgotPassword from AuthService Api -->
      <div class="formGroup">
        <input type="submit" class="btn btnPrimary" value="Reset Password" (click)="authService.ForgotPassword(passwordResetEmail.value)">
      </div>
    </div>

    <div class="redirectToLogin">
      <span>Go back to ? <span class="redirect" routerLink="/sign-in">Log In</span></span>
    </div>

  </div>
</div>

10. How to Send Email Verification using Firebase API in Angular 7|8|9?

Firebase allows us to send email verification smoothly. I am going to show you how you can achieve this functionality easily using Firebase API.

Go to src/app/components/verify-email/verify-email.component.ts file and add the given below code.

import { Component, OnInit } from '@angular/core';
import { AuthService } from "../../shared/services/auth.service";

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

  constructor(
    public authService: AuthService
  ) { }

  ngOnInit() {
  }

}

Go to src/app/components/verify-email/verify-email.component.html file and add the given below code.

<div class="displayTable">
  <div class="displayTableCell">

    <div class="authBlock">
      <h3>Thank You for Registering</h3>

      <div class="formGroup" *ngIf="authService.userData as user">
        <p class="text-center">We have sent a confirmation email to <strong>{{user.email}}</strong>.</p>
        <p class="text-center">Please check your email and click on the link to verfiy your email address.</p>
      </div>

      <!-- Calling SendVerificationMail() method using authService Api -->
      <div class="formGroup">
        <button type="button" class="btn btnPrimary" (click)="authService.SendVerificationMail()">
          <i class="fas fa-redo-alt"></i>
          Resend Verification Email
        </button>
      </div>

    </div>

    <div class="redirectToLogin">
      <span>Go back to?<span class="redirect" routerLink="/sign-in"> Sign in</span></span>
    </div>

  </div>
</div>

11. How to Use CanActivate method to Prevent Access of URL in Angular 7|8|9 App using Route Guards?

In this section, I will be showing you how you can secure your app’s routes from unauthorized access using canActivate() route guard method. This method is pretty helpful when we need to secure our app’s URL.

First, go to src/app/shared/services/auth.service.ts file and look for the isLoggedIn() method. This function returns the boolean result to true when the user is logged in && user’s email is verified. If either condition doesn’t match it will return false and doesn’t allow users to access the desired pages.

import { AngularFireAuth } from "@angular/fire/auth";

export class AuthService {
  userData: any; // Save logged in user data

  constructor(
    public afAuth: AngularFireAuth, // Inject Firebase auth service
  ) {    
    /* Saving user data in localstorage when 
    logged in and setting up null when logged out */
    this.afAuth.authState.subscribe(user => {
      if (user) {
        this.userData = user;
        localStorage.setItem('user', JSON.stringify(this.userData));
        JSON.parse(localStorage.getItem('user'));
      } else {
        localStorage.setItem('user', null);
        JSON.parse(localStorage.getItem('user'));
      }
    })
  }

  // Returns true when user is looged in and email is verified
  get isLoggedIn(): boolean {
    const user = JSON.parse(localStorage.getItem('user'));
    return (user !== null && user.emailVerified !== false) ? true : false;
  }

}

We have to secure all the inner pages in the app which are only accessible to logged in users.

To get this functionality, we have to generate route guard files. Run the below command to create route guards.

ng generate guard shared/guard/auth

Go to src/app/shared/guard/auth.guard.ts file and include the following code.

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

@Injectable({
  providedIn: 'root'
})

export class AuthGuard implements CanActivate {

  constructor(
    public authService: AuthService,
    public router: Router
  ){ }

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean {
    if(this.authService.isLoggedIn !== true) {
      this.router.navigate(['sign-in'])
    }
    return true;
  }

}

We have successfully secured our app’s inner pages now if no user will be able to access our app’s inner pages unless they are logged in. If anybody puts the inner page’s URL in the browser directly then they will be redirected to the sign-in page.

Let’s create another guard which will prevent access for sign in, sign up, password recovery and email verification pages when the user is already logged in.

Run the below command to generate route guard.

ng generate guard shared/guard/secure-inner-pages.guard.ts

Go to src/app/shared/guard/secure-inner-pages.guard.ts file and include the following code.

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

@Injectable({
  providedIn: 'root'
})

export class SecureInnerPagesGuard implements CanActivate {

  constructor(
    public authService: AuthService,
    public router: Router
  ) { }

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean {
    if(this.authService.isLoggedIn) {
      window.alert("You are not allowed to access this URL!");
       this.router.navigate(['dashboard'])
    }
    return true;
  }

}

We’ve successfully created canActivated guards now we have to include these guards in routes services.

Go to src/app/shared/routing/app-routing.module.ts file.

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

// Required components for which route services to be activated
import { SignInComponent } from '../../components/sign-in/sign-in.component';
import { SignUpComponent } from '../../components/sign-up/sign-up.component';
import { DashboardComponent } from '../../components/dashboard/dashboard.component';
import { ForgotPasswordComponent } from '../../components/forgot-password/forgot-password.component';
import { VerifyEmailComponent } from '../../components/verify-email/verify-email.component';

// Import canActivate guard services
import { AuthGuard } from "../../shared/guard/auth.guard";
import { SecureInnerPagesGuard } from "../../shared/guard/secure-inner-pages.guard";

// Include route guard in routes array
const routes: Routes = [
  { path: '', redirectTo: '/sign-in', pathMatch: 'full'},
  { path: 'sign-in', component: SignInComponent, canActivate: [SecureInnerPagesGuard]},
  { path: 'register-user', component: SignUpComponent, canActivate: [SecureInnerPagesGuard]},
  { path: 'dashboard', component: DashboardComponent, canActivate: [AuthGuard] },
  { path: 'forgot-password', component: ForgotPasswordComponent, canActivate: [SecureInnerPagesGuard] },
  { path: 'verify-email-address', component: VerifyEmailComponent, canActivate: [SecureInnerPagesGuard] }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})

export class AppRoutingModule { }

12. How to Maintain Logged in State of Firebase User in localStorage with Angular 7|8|9?

I will be discussing with you how you can maintain the logged in user data in Local Storage with Angular.

Our logic is pretty straightforward when the user is logged in we will save the user data in Local Storage, user details will be available even if we refresh the page. We will remove the user data from local storage if we log out from the app.

Without wasting time let’s write our logic.

Go to src/app/services/auth.service.ts file and add the given below code.

import { Injectable, NgZone } from '@angular/core';
import { User } from "../services/user";
import { auth } from 'firebase/app';
import { AngularFireAuth } from "@angular/fire/auth";
import { AngularFirestore, AngularFirestoreDocument } from '@angular/fire/firestore';
import { Router } from "@angular/router";

@Injectable({
  providedIn: 'root'
})

export class AuthService {
  userData: any; // Save logged in user data

  constructor(
    public afs: AngularFirestore,   // Inject Firestore service
    public afAuth: AngularFireAuth, // Inject Firebase auth service
    public router: Router,  
    public ngZone: NgZone // NgZone service to remove outside scope warning
  ) {    
    /* Saving user data in localstorage when 
    logged in and setting up null when logged out */
    this.afAuth.authState.subscribe(user => {
      if (user) {
        this.userData = user;
        localStorage.setItem('user', JSON.stringify(this.userData));
        JSON.parse(localStorage.getItem('user'));
      } else {
        localStorage.setItem('user', null);
        JSON.parse(localStorage.getItem('user'));
      }
    })
  }

  // Sign in with email/password
  SignIn(email, password) {
    return this.afAuth.auth.signInWithEmailAndPassword(email, password)
      .then((result) => {
        this.ngZone.run(() => {
          this.router.navigate(['dashboard']);
        });
        this.SetUserData(result.user);
      }).catch((error) => {
        window.alert(error.message)
      })
  }

  // Sign up with email/password
  SignUp(email, password) {
    return this.afAuth.auth.createUserWithEmailAndPassword(email, password)
      .then((result) => {
        /* Call the SendVerificaitonMail() function when new user sign 
        up and returns promise */
        this.SendVerificationMail();
        this.SetUserData(result.user);
      }).catch((error) => {
        window.alert(error.message)
      })
  }

  // Sign in with Google
  GoogleAuth() {
    return this.AuthLogin(new auth.GoogleAuthProvider());
  }  

  // Auth logic to run auth providers
  AuthLogin(provider) {
    return this.afAuth.auth.signInWithPopup(provider)
    .then((result) => {
       this.ngZone.run(() => {
          this.router.navigate(['dashboard']);
        })
      this.SetUserData(result.user);
    }).catch((error) => {
      window.alert(error)
    })
  }

  /* Setting up user data when sign in with username/password, 
  sign up with username/password and sign in with social auth  
  provider in Firestore database using AngularFirestore + AngularFirestoreDocument service */
  SetUserData(user) {
    const userRef: AngularFirestoreDocument<any> = this.afs.doc(`users/${user.uid}`);
    const userData: User = {
      uid: user.uid,
      email: user.email,
      displayName: user.displayName,
      photoURL: user.photoURL,
      emailVerified: user.emailVerified
    }
    return userRef.set(userData, {
      merge: true
    })
  }

  // Sign out 
  SignOut() {
    return this.afAuth.auth.signOut().then(() => {
      localStorage.removeItem('user');
      this.router.navigate(['sign-in']);
    })
  }

}

Consume AuthService API just go to src/app/components/dashboard/dashboard.component.html file and add the following code.

<!-- Top navigation -->
<nav class="navbar navbar-dark fixed-top bg-dark flex-md-nowrap p-0 shadow">
  <a class="navbar-brand col-sm-3 col-md-2 mr-0" routerLink="/register-student">
    <img class="brand-logo" src="assets/logo-positronx-white.svg" alt="positronX.io Logo">
    <span class="dasboard-text">Dashboard</span>
  </a>
</nav>

<!-- Sidebar navigation -->
<div class="container-fluid">
  <div class="row">

    <nav class="col-md-2 d-md-block bg-light sidebar">
      <div class="sidebar-sticky">
        <ul class="nav flex-column">
          <li class="nav-item">
            <a class="nav-link active">
              <i class="fas fa-user"></i>User Profile
            </a>
          </li>
          <!-- Calling SignOut() Api from AuthService -->
          <li class="nav-item">
            <a class="nav-link" (click)="authService.SignOut()">
              <i class="fas fa-sign-out-alt"></i>Log out
            </a>
          </li>
        </ul>
      </div>
    </nav>

    <!-- Main content -->
    <main role="main" class="col-md-9 ml-sm-auto col-lg-10 px-4">
      <div class="inner-adjust">

        <div class="pt-3 pb-2 mb-3 border-bottom">
          <h1 class="h2">User Profile</h1>
        </div>
        <!-- Show user data when logged in -->
        <div class="row" *ngIf="authService.userData as user">
          <div class="col-md-12">
            <div class="media">
              <img class="align-self-start mr-5 img-thumbnail rounded-circle" src="{{(user.photoURL) ? user.photoURL : '/assets/dummy-user.png'}}"
                alt="{{user.displayName}}">
              <div class="media-body">
                <h1>Hello: <strong>{{(user.displayName) ? user.displayName : 'User'}}</strong></h1>
                <p>User ID: <strong>{{user.uid}}</strong></p>
                <p>Email: <strong>{{user.email}}</strong></p>
                <p>Email Verified: <strong>{{user.emailVerified}}</strong></p>
              </div>
            </div>
          </div>
        </div>

      </div>
    </main>

  </div>
</div>

It will look like this.

Logged in State of Firebase User in localStorage

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#Angular #Firebase #Security #WebDev #JavaScript

Building Angular 9 Authentication System from scratch using Firebase
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