Build a CRUD App with Angular 8 and Firebase

Build a CRUD App with Angular 8 and Firebase

This Angular 8/9 tutorial explains how to use Angular 8/9 with Firebase and Firestore to create an app that implements the common CRUD operations. How to add Firebase CRUD operations to your Angular 8 project that allow you to create, read, update and delete data from a Firestore database. How to set up Firebase in our Angular 8 project, and create a service for implementing Firebase CRUD operations using the Firestore realtime database.

In this tutorial, you'll be using Angular 8/9 with Firebase and Firestore to create an app that implements the common CRUD operations.

We'll see setp by step how to set up Firebase in our Angular 8 project, and create a service for implementing Firebase CRUD operations using the Firestore realtime database.

These are the steps of our Angular Firebase CRUD tutorial:

  • Step 1 - Creating your Angular 8 Project
  • Step 2 - Creating a Firebase Project and a Firestore Database
  • Step 3 - Installing and Adding Firebase to your Angular 8 Project.
  • Step 4 - Create an Angular 8 Model
  • Step 5 - Creating an Angular 8 Service
  • Step 6 - Creating a Component for Making CRUD Operations
What is CRUD?

CRUD stands for Create, Read, Update and Delete and refer to the operations that we run against a database to createn retrieve and update data. In this example, the database is a Firestore database that exists on the cloud.

Note: This tutorial works with Angular 9.

Prerequisites

Before starting this tutorial, you first need to make sure, you have:

  • A recent version of Node.js (v10+) and NPM installed on your system,
  • The latest Angular CLI 8 installed on your system.

If you have the prerequisites, you are ready to start creating your project!

Step 1 - Creating your Angular 8 Project

The first step in this tutorial is creating a new Angular 8 project using the CLI.

Head over to your terminal and run the following command:

$ ng new angular-firebase-crud

The CLI will ask if you want to add routing to your project (you can choose any option you want) and which style sheet format you want to use (You can select CSS).

After that, your project files will be generated and your project's dependencies will be installed.

Step 2 - Creating a Firebase Project and a Firestore Database

Now that your project is generated, you need to proceed with creating a Firebase project and a Firestore database. For this matter, you simply need to go to the Firebase Console and create a new Firebase project.

Next head to the Project Overview >Develop >Database page and create a new Firestore database. For now, make sure you enable test mode so you don't need any permissions to access the database.

Step 3 - Installing and Adding Firebase to your Angular 8 Project.

After creating your Firebase project and your Firestore database you next need to install the firebase and @angular/fire packages as follows:

$ cd ./angular-firebase-crud
$ npm install --save firebase @angular/fire

Next go to your Firebase project overview then click on web and copy the config data.

Next, open the environments/environment.ts file in your Angular 8 project and add the firebaseConfig object inside the environment object.

export const environment = {
  production: false,
  firebaseConfig : {
    apiKey: "YOUR_API_KEY",
    authDomain: "YOUR_AUTH_DOMAIN",
    databaseURL: "YOUR_DATABASE_URL",
    projectId: "YOUR_PROJECT_ID",
    storageBucket: "YOUR_STORAGE_BUCKET",
    messagingSenderId: "YOUR_MESSAGING_SENDER_ID"
  }
};

Finally, you have to set up Firebase in your project. Open the src/app/app.module.ts file and update it accordingly:

import { AngularFireModule } from '@angular/fire';
import { AngularFireDatabaseModule } from '@angular/fire/database';
import { environment } from '../environments/environment';

@NgModule({
        // [...]
    imports: [
        // [...]
        AngularFireModule.initializeApp(environment.firebaseConfig),
        AngularFireDatabaseModule
    ],

You simply import AngularFireModule and AngularFireDatabaseModule and you add them to the imports array of the main application module.

You also call the initializeApp() method of AngularFireModule to pass the configuration object that you added earlier to the environments/environment.ts file.

That's it, you now have added Firebase and Firestore to your Angular 8 project.

Step 4 - Create an Angular 8 Model

After setting up Firestore in your project, you can proceed with creating a model class. In the simple example, we suppose that you are creating an insurance app where we need to manage a set of policies.

An insurance application will often contain more that one type of data like clients, employees and policies etc. In this example, we'll just focus on the policy entity.

Let's create a model for our insurance policy entity as follows:

$ ng g class policy --type=model

Next, open the src/policy.model.ts file and update it as follows:

export class Policy {
    id: string;
    policyNumber: string;
    creationDate: Date;
    effectiveDate: Date;
    expireDate: Date;
    paymentOption: string;
    policyAmount: number;
    extraInfo: string;
}

This is an example of an insurance policy with many fields and relationships with other entities omitted for the sake of simplicity.

Step 5 - Creating an Angular 8 Service

An Angular service allows you to encapsulate the code that could be repeated in many places in your project. Using the Angular CLI, run the following command to generate a service:

$ ng g service policy

Next, open the src/policy.service.ts file and update it accordingly.

First, import AngularFirestore and the Policy model as follows:

import { AngularFirestore } from '@angular/fire/firestore';
import { Policy } from 'src/app/policy.model';

Next, inject AngularFirestore in your service via its constructor:

export class PolicyService {
  constructor(private firestore: AngularFirestore) { }
}

Next, add the getPolicies() method to retrieve the available policies from the Firestore collection:

getPolicies() {
    return this.firestore.collection('policies').snapshotChanges();
}

You also need to add the createPolicy() method to persist an insurance policy in the Firestore database:

createPolicy(policy: Policy){
    return this.firestore.collection('policies').add(policy);
}

Next, you need to add the updatePolicy() method to update an insurance policy by its identifier:

updatePolicy(policy: Policy){
    delete policy.id;
    this.firestore.doc('policies/' + policy.id).update(policy);
}

Finally, you can add the deletePolicy() method to delete an insurance policy by its identifier:

deletePolicy(policyId: string){
    this.firestore.doc('policies/' + policyId).delete();
}

Step 6 - Creating a Component for Making CRUD Operations

After creating the model and service for creating, reading, updating and deleting insurance policies, you now need to create the component for testing our methods:

Using Angular CLI 8 run the following command to generate a component:

$ ng g c policy-list

Now, open the src/app/policy-list/policy-list.component.ts file and update it accordingly:

import { Component, OnInit } from '@angular/core';
import { PolicyService } from 'src/app/policy.service';
import { Policy } from 'src/app/policy.model';

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

  policies: Policy[];
  constructor(private policyService: PolicyService) { }

  ngOnInit() {
    this.policyService.getPolicies().subscribe(data => {
      this.policies = data.map(e => {
        return {
          id: e.payload.doc.id,
          ...e.payload.doc.data()
        } as Policy;
      })
    });
  }

  create(policy: Policy){
      this.policyService.createPolicy(policy);
  }

  update(policy: Policy) {
    this.policyService.updatePolicy(policy);
  }

  delete(id: string) {
    this.policyService.deletePolicy(id);
  }
}

Updating the Component Template

Now let's update the component's template to display the insurance policies and also display buttons that can be used to create, update and delete policies:

Open the src/app/policy-list.component.html file and add the following HTML markup:

<table>
  <thead>
    <th>Number</th>
    <th>Created At</th>
    <th>Expire At</th>
    <th>Amount</th>
  </thead>
  <tbody>
    <tr *ngFor="let policy of policies">

      <td>{{policy.policyNumber}}</td>
      <td>{{policy.creationDate}}</td>
      <td>{{policy.expireDate}}</td>
      <td>{{policy.policyAmount}}</td>
      <td>
          <button (click)="delete(policy.id)">Delete</button>
      </td>
    </tr>
  </tbody>
</table>

Below the <table> markup, you can also add a form to create an insurance policy.

Conclusion

In this tutorial, we've seen by example how to add Firebase CRUD operations to your Angular 8 project that allow you to create, read, update and delete data from a Firestore database.

Building Angular 9 Authentication System from scratch using Firebase

Building Angular 9 Authentication System from scratch using Firebase

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

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.

Thank a lot for taking time to read this tutorial, I believe this tutorial has been helpful to you. If you think this tutorial has been helpful then please consider putting a star on my Git repo.

How to deploy Angular App to Firebase using Angular CLI 8.3+

How to deploy Angular App to Firebase using Angular CLI 8.3+

In this tutorial, we’ll create the production bundles of our Angular application and deploy it to Firebase using Angular CLI 8.3+.

You have finally developed your Angular application and you are ready to deploy it to a hosting provider and show it to the world! But, you think, you still have to do so much work to host the application. Fortunately for you, that's not true any more thanks to the latest 8.3+ version of Angular CLI which added a new command to the Angular developer arsenal, just like the ng add command introduced in Angular 7.

The command is ng deploy and as you can guess, it allows you to deploy your Angular application from the command-line using Angular CLI. The command doesn't work out of the box as you need to use it with the ng add command to install a |CLI builder](https://angular.io/guide/cli-builder) that gives your project the required deployment capability to work with a specific hosting provider. This is quite expected since there are various providers, each one with its own configuration.

In this tutorial, we’ll create the production bundles of our Angular application and deploy it to Firebase using Angular CLI 8.3+.

We assume that you already have initialized a project with Angular CLI and that you have installed or updated your project to the latest version of Angular CLI.

How to automatically deploy your Angular project to Firebase? This can be done in 5 easy steps:

  • Step 0 - Setting up your Firebase account and creating a project
  • Step 1 - Adding the Firebase deployment capability to your Angular project
  • Step 2 - Providing the authorization code to Firebase CLI
  • Step 3 - Selecting a Firebase project
  • Step 4 - Building & deploying your Angular project to Firebase
Step 0 - Setting up your Firebase account and creating a project

In the first step, you need to set up a Firebase account and create a project.

Go to the Getting started page and simply follow the instructions there to set up a Firebase account.

Once you have created a Firebase account, you need to create a project in Firebase's dashboard. Simply click on Add project to create a new project.

A box will show up asking you to provide some information about your project. Provide a name for your project and click on the CREATE PROJECT button.

That's it! You have successfully created a Firebase account and project. Let's now head back to the Angular project.

Step 1 - Adding the Firebase deployment capability to your Angular project

The first step is to navigate to your Angular project and add the deployment capability for your target hosting provider. In our case, it's Firebase.

Go to your terminal, and run the following command from the root of your project:

$ ng add @angular/fire

This will add the Firebase deployment capability to your project.

Step 2 - Providing the authorization code to Firebase CLI

The CLI will ask you to Paste authorization code here:**** and will open your default web browser and ask you to give Firebase CLI permissions to administer your Firebase account:

After you log in with the Google account, you’ll be provided with the authorization code:

Step 3 - Selecting a Firebase project

Next, you’ll be asked: Please select a project: (Use arrow keys or type to search). You should have created a Firebase project before.

The CLI will create the firebase.json and .firebaserc files and update the angular.json file accordingly.

Step 4 - Building & deploying your Angular project to Firebase

Finally, you can deploy your application to Firebase, using the following command:

$ ng deploy

The command will build your application (similarly to the ng deploy --prod command), and send the production assets to Firebase.

Conclusion

Thanks to Angular CLI 8.3+, it's now easier than ever to deploy your Angular project to popular hosting and cloud platforms such as Firebase, GitHub, Now and Netlify. You can also search npm for the required package to target your platform, if one doesn't exist or if you're deploying to a self-managed server, you can either create a builder that allows you to use the ng deploy command or manually deploy your app. Check out the official docs for more information.

How to Use Algolia with Firebase Angular Apps

How to Use Algolia with Firebase Angular Apps

Algolia is a super powerful, scalable API service that allows developers to send different forms of data into their platform and quickly perform search, sort and complex filter queries on top of it.

What is Algolia?

Algolia is a super powerful, scalable API service that allows developers to send different forms of data into their platform and quickly perform search, sort and complex filter queries on top of it. The service is incredibly fast, by using replica indexes to pre-build common query conditions to send your data back as quick as possible.

Why use Algolia with Firebase?

Firebase has come a long way in terms of its accessibility with querying data structures, especially in Firestore. Even with these advancements, it has limitations and often time requires pre-sorted data, using Firebase’s syntax sugar with push ids (push ids contain a date hash in their generation) and sacrificing extra reads/writes and straight forward object structure. Firebase also officially recommends Algolia for performing full-text search operations in Firestore.

Getting Started

In this working example, we will be using Firebase Cloud Functions with triggers to help assist with syncing data changes from Firestore over to Algolia. We will also be using the Algolia Node.JS and JavaScript client module for interacting with their service.

Firebase Cloud Functions

In your functions directory you will need to install the following dependencies to leverage Algolia.

npm install --save algoliasearch @types/algoliasearch

For this example we will listen for whenever a new user document is created, updated or deleted in our custom Firestore collection “users”.

For each of the below examples you will need to replace appId and apiKey with your own access tokens generated through Algolia’s admin panel.

user.onCreate.ts

The userOnCreate trigger is dispatched every time a new document is created in the users collection. In the example below we initialize Algolia with our app’s id and unique API key and initialize the index we want to use in Algolia. Algolia recommends naming your index by the instance/environment you are working with (i.e. dev_, prod_, staging_, next_).

We are also replicating to indexes so that we can sort by the user’s name in either ascending or descending order. Algolia reserves objectID for correlating records in their world; we will use the new document’s path id.

import * as algoliasearch from 'algoliasearch';
import * as functions from 'firebase-functions';

export const userOnCreate = functions.firestore
.document('users/{id}')
.onCreate(async (change, context) => {
const user = change.data();
const client = algoliasearch('appId', 'apiKey');
const index = client.initIndex('dev_users');
await index.setSettings({
replicas: [
'dev_users_name_desc',
'dev_users_name_asc'
]
});
return index.addObject({
objectID: change.id,
...user
});
});

user.onUpdate.ts

The userOnUpdate trigger is very similar to the create trigger. The difference is that we do not need to re-specify the replica indexes since once we register them; they will automatically push data over to the replica indexes any time we write to the parent index (dev_users).

To reduce the operation cost, Algolia allows partial updates to only change specific properties on an index’s object.

import * as algoliasearch from 'algoliasearch';
import * as functions from 'firebase-functions';

export const userOnUpdate = functions.firestore
.document('users/{id}')
.onCreate(async (change, context) => {
const user = change.data();
const client = algoliasearch('appId', 'apiKey');
const index = client.initIndex('dev_users');
return index.partialUpdateObject({
objectID: change.id,
...user
});
});

user.onDelete.ts

The userOnDelete trigger is the simplest operation with an initialize and delete object call to remove the Algolia object by the objectID we defined earlier.

import * as algoliasearch from 'algoliasearch';
import * as functions from 'firebase-functions';

export const userOnDelete = functions.firestore
.document('users/{id}')
.onCreate(async (change, context) => {
const client = algoliasearch('appId', 'apiKey');
const index = client.initIndex('dev_users');
return index.deleteObject(change.id);
});

Export all of these constants to your root index.ts file. This will register them as new Firebase Cloud Functions when you build and deploy. At this point any time you change documents in Firestore (either directly through the Firebase Console or with your app) it will trigger these functions to push and sync data across to Algolia.

firebase deploy --only functions:userOnCreate,functions:userOnUpdate,functions:userOnDelete
Application Side
You can store Algolia’s search-only access token (this is different than the apiKey used in Cloud Functions) in your environments file to easily access/import it.

Create a simple service to easily interact with your Algolia indexes.

user.service.ts

import * as algoliasearch from 'algoliasearch';

@Injectable()
export class UserService {

client: algoliasearch.Client;

init(config: {
appId: string,
apiKey: string
}) {
this.client = algoliasearch('appId', 'apiKey');
}

fetchUsers(options: algoliasearch.QueryParameters) {
const userSearch = this.client.initIndex('dev_users');
return userSearch.search(options);
}

fetchUsersByNameAsc(options: algoliasearch.QueryParameters) {
const userSearch = this.client.initIndex('dev_users_name_asc');
return userSearch.search(options);
}

fetchUsersByNameDesc(options: algoliasearch.QueryParameters) {
const userSearch = this.client.initIndex('dev_users_name_desc');
return userSearch.search(options);
}

}

In your component, provide UserService and make the following method calls to test the response back from Algolia.

async ngOnInit() {
this.init({ appId: 'foo', apiKey: 'bar' });
const res = await this.fetchUsers({
page: 0,
length: 10,
query: 'Sean'
});
console.log('res', res);
}

This method call will attempt to load the first page of results, up to 10 records that has a searchable attribute that matches “Sean”.

Final Thoughts

Without getting too far into the weeds of Algolia’s client and explicitly focusing on syncing data over and quickly logging that information out; we can see that Algolia serves as a powerful interface to receive the exact data we need.

In our implementation on Hive, we use Algolia to handle paginated admin tables, infinite scroll experiences, pre-filtering collection records by specific conditions and sorting table data. You can also leverage Algolia as a read-only database, only storing/syncing documents that the client should have access to. This is powerful when using concepts such as soft deletes, where you stamp a document with a deletedAt timestamp in Firestore and remove the object from Algolia. By doing this, you can always recover the document back, but all querying logic from Algolia will treat the document as being deleted.

Thanks for reading. If you liked this post, share it with all of your programming buddies!

Further reading

☞ Learn and Understand AngularJS

☞ The Complete Angular Course: Beginner to Advanced

☞ Angular Crash Course for Busy Developers


Originally published on medium.com