This tutorial will guide you through the process of setting up and implementing Firebase Authentication in an Angular project. Firebase Authentication provides a secure and easy way to manage user authentication in your application, including features such as email/password authentication, social media authentication, and user roles. By the end of this tutorial, you will have a fully functional authentication system in your Angular application using Firebase.

![angular firebase authentication guide](https://dopebase.com/media/cover2.jpg)
## Introduction
### What is Angular?
Angular is a popular JavaScript framework for building web applications. It allows developers to build dynamic and interactive web pages using a component-based architecture. Angular provides a wide range of features and tools that make it easy to develop scalable and maintainable applications.

### What is Firebase Authentication?
Firebase Authentication is a service provided by Google Firebase that allows developers to easily add authentication functionality to their applications. It provides a secure way to authenticate users using email/password, social media logins, and more. Firebase Authentication also handles user management tasks such as user registration, password reset, and email verification.

### Setting up Angular Project
Before we can start implementing Firebase Authentication in our Angular project, we need to set up the project itself. This involves installing the Angular CLI and creating a new Angular project. We will also need to add Firebase to our project.

#### Installing Angular CLI
To install the Angular CLI, open your terminal or command prompt and run the following command:

```bash
npm install -g @angular/cli
```

#### Creating a new Angular project
Once the Angular CLI is installed, we can create a new Angular project by running the following command:

```bash
ng new my-project
```

This will create a new directory called "my-project" with the basic structure of an Angular project.

#### Adding Firebase to the project
To add Firebase to our Angular project, we need to install the Firebase SDK. Run the following command in your terminal or command prompt:

```bash
npm install firebase
```

Now that we have our Angular project set up and Firebase installed, we can move on to implementing Firebase Authentication.

## Firebase Authentication
In this section, we will configure Firebase Authentication in our Angular project and implement the necessary functionality for user sign up, sign in, sign out, and handling user authentication state.

### Configuring Firebase Authentication
To configure Firebase Authentication, we need to create a new Firebase project and enable the Authentication service. 

1. Visit the [Firebase Console](https://console.firebase.google.com/) and create a new project.
2. Once the project is created, navigate to the "Authentication" section in the Firebase Console.
3. Click on the "Sign-in method" tab and enable the desired authentication providers (e.g., email/password, Google, Facebook, etc.).

### Implementing Sign Up functionality
To allow users to sign up for our application, we need to create a sign-up form and handle the form submission in our Angular project. 

1. In your Angular project, create a new component called "SignUp" using the Angular CLI:

```bash
ng generate component SignUp
```

2. Open the "sign-up.component.html" file and add the following form:

```html
<form (ngSubmit)="onSubmit()">
  <input type="email" [(ngModel)]="email" name="email" placeholder="Email" required>
  <input type="password" [(ngModel)]="password" name="password" placeholder="Password" required>
  <button type="submit">Sign Up</button>
</form>
```

3. In the "sign-up.component.ts" file, add the following code:

```typescript
import { Component } from '@angular/core';
import { AngularFireAuth } from '@angular/fire/auth';

@Component({
  selector: 'app-sign-up',
  templateUrl: './sign-up.component.html',
  styleUrls: ['./sign-up.component.css']
})
export class SignUpComponent {
  email: string;
  password: string;

  constructor(private afAuth: AngularFireAuth) {}

  onSubmit() {
    this.afAuth.createUserWithEmailAndPassword(this.email, this.password)
      .then((userCredential) => {
        // Handle successful sign up
      })
      .catch((error) => {
        // Handle error
      });
  }
}
```

In this code, we import the `AngularFireAuth` module from `@angular/fire/auth` and inject it into our component. In the `onSubmit()` method, we use the `createUserWithEmailAndPassword()` method to create a new user with the provided email and password.

### Implementing Sign In functionality
To allow users to sign in to our application, we need to create a sign-in form and handle the form submission in our Angular project.

1. In your Angular project, create a new component called "SignIn" using the Angular CLI:

```bash
ng generate component SignIn
```

2. Open the "sign-in.component.html" file and add the following form:

```html
<form (ngSubmit)="onSubmit()">
  <input type="email" [(ngModel)]="email" name="email" placeholder="Email" required>
  <input type="password" [(ngModel)]="password" name="password" placeholder="Password" required>
  <button type="submit">Sign In</button>
</form>
```

3. In the "sign-in.component.ts" file, add the following code:

```typescript
import { Component } from '@angular/core';
import { AngularFireAuth } from '@angular/fire/auth';

@Component({
  selector: 'app-sign-in',
  templateUrl: './sign-in.component.html',
  styleUrls: ['./sign-in.component.css']
})
export class SignInComponent {
  email: string;
  password: string;

  constructor(private afAuth: AngularFireAuth) {}

  onSubmit() {
    this.afAuth.signInWithEmailAndPassword(this.email, this.password)
      .then((userCredential) => {
        // Handle successful sign in
      })
      .catch((error) => {
        // Handle error
      });
  }
}
```

In this code, we import the `AngularFireAuth` module from `@angular/fire/auth` and inject it into our component. In the `onSubmit()` method, we use the `signInWithEmailAndPassword()` method to sign in the user with the provided email and password.

### Implementing Sign Out functionality
To allow users to sign out of our application, we need to create a sign-out button and handle the sign-out action in our Angular project.

1. In your Angular project, open the "app.component.html" file and add the following button:

```html
<button (click)="signOut()">Sign Out</button>
```

2. In the "app.component.ts" file, add the following code:

```typescript
import { Component } from '@angular/core';
import { AngularFireAuth } from '@angular/fire/auth';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  constructor(private afAuth: AngularFireAuth) {}

  signOut() {
    this.afAuth.signOut()
      .then(() => {
        // Handle successful sign out
      })
      .catch((error) => {
        // Handle error
      });
  }
}
```

In this code, we import the `AngularFireAuth` module from `@angular/fire/auth` and inject it into our component. In the `signOut()` method, we use the `signOut()` method to sign out the currently authenticated user.

### Handling User Authentication State
To handle the user authentication state in our Angular project, we can use the `authState` observable provided by Firebase Authentication.

1. In your Angular project, open the "app.component.ts" file and add the following code:

```typescript
import { Component } from '@angular/core';
import { AngularFireAuth } from '@angular/fire/auth';
import { Observable } from 'rxjs';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  user: Observable<firebase.User>;

  constructor(private afAuth: AngularFireAuth) {
    this.user = afAuth.authState;
  }
}
```

In this code, we import the `AngularFireAuth` module from `@angular/fire/auth` and inject it into our component. We also import the `Observable` class from `rxjs` to handle the asynchronous nature of the `authState` observable. In the constructor, we assign the `authState` observable to the `user` property.

## Additional Authentication Features
In addition to the basic sign up, sign in, and sign out functionality, Firebase Authentication provides additional features such as resetting passwords, email verification, social media authentication, securing Angular routes, and handling user roles.

### Resetting Password
To allow users to reset their passwords, we can use the `sendPasswordResetEmail()` method provided by Firebase Authentication.

1. In your Angular project, create a new component called "ResetPassword" using the Angular CLI:

```bash
ng generate component ResetPassword
```

2. Open the "reset-password.component.html" file and add the following form:

```html
<form (ngSubmit)="onSubmit()">
  <input type="email" [(ngModel)]="email" name="email" placeholder="Email" required>
  <button type="submit">Reset Password</button>
</form>
```

3. In the "reset-password.component.ts" file, add the following code:

```typescript
import { Component } from '@angular/core';
import { AngularFireAuth } from '@angular/fire/auth';

@Component({
  selector: 'app-reset-password',
  templateUrl: './reset-password.component.html',
  styleUrls: ['./reset-password.component.css']
})
export class ResetPasswordComponent {
  email: string;

  constructor(private afAuth: AngularFireAuth) {}

  onSubmit() {
    this.afAuth.sendPasswordResetEmail(this.email)
      .then(() => {
        // Handle successful password reset email
      })
      .catch((error) => {
        // Handle error
      });
  }
}
```

In this code, we import the `AngularFireAuth` module from `@angular/fire/auth` and inject it into our component. In the `onSubmit()` method, we use the `sendPasswordResetEmail()` method to send a password reset email to the user with the provided email.

### Email Verification
To verify user email addresses, we can use the `sendEmailVerification()` method provided by Firebase Authentication.

1. In your Angular project, open the "sign-up.component.ts" file and add the following code to the `onSubmit()` method:

```typescript
onSubmit() {
  this.afAuth.createUserWithEmailAndPassword(this.email, this.password)
    .then((userCredential) => {
      userCredential.user.sendEmailVerification();
      // Handle successful sign up
    })
    .catch((error) => {
      // Handle error
    });
}
```

In this code, we call the `sendEmailVerification()` method on the `user` object returned by the `createUserWithEmailAndPassword()` method to send a verification email to the user.

### Social Media Authentication
Firebase Authentication supports social media logins such as Google, Facebook, Twitter, and more. To implement social media authentication in our Angular project, we need to enable the desired authentication providers in the Firebase Console and use the corresponding methods provided by Firebase Authentication.

1. In your Angular project, open the "sign-in.component.ts" file and add the following code to the `onSubmit()` method:

```typescript
onSubmit() {
  this.afAuth.signInWithPopup(new firebase.auth.GoogleAuthProvider())
    .then((userCredential) => {
      // Handle successful sign in
    })
    .catch((error) => {
      // Handle error
    });
}
```

In this code, we use the `signInWithPopup()` method with the `GoogleAuthProvider` to sign in the user using their Google account. You can replace `GoogleAuthProvider` with the desired provider (e.g., `FacebookAuthProvider`, `TwitterAuthProvider`, etc.).

## Securing Angular Routes
To secure certain routes in our Angular application and restrict access to authenticated users, we can use route guards provided by Angular.

### Implementing Route Guards
1. In your Angular project, create a new service called "AuthGuard" using the Angular CLI:

```bash
ng generate service AuthGuard
```

2. Open the "auth-guard.service.ts" file and add the following code:

```typescript
import { Injectable } from '@angular/core';
import { CanActivate, Router } from '@angular/router';
import { AngularFireAuth } from '@angular/fire/auth';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

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

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

  canActivate(): Observable<boolean> {
    return this.afAuth.authState.pipe(
      map((user) => {
        if (user) {
          return true;
        } else {
          this.router.navigate(['/sign-in']);
          return false;
        }
      })
    );
  }
}
```

In this code, we import the `CanActivate` interface and the `Router` module from `@angular/router`, the `AngularFireAuth` module from `@angular/fire/auth`, and the `Observable` and `map` operators from `rxjs`. We then implement the `CanActivate` interface and define the `canActivate()` method. In this method, we use the `authState` observable to check if the user is authenticated. If the user is authenticated, we return `true` to allow access to the route. If the user is not authenticated, we navigate the user to the sign-in page and return `false`.

### Restricting Access to Authenticated Users
To restrict access to certain routes in our Angular application to only authenticated users, we can use the `canActivate` property in the route configuration.

1. In your Angular project, open the "app-routing.module.ts" file and add the following code:

```typescript
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { AuthGuard } from './auth-guard.service';

const routes: Routes = [
  { path: 'dashboard', component: DashboardComponent, canActivate: [AuthGuard] },
  { path: 'profile', component: ProfileComponent, canActivate: [AuthGuard] },
  // ...
];

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

In this code, we import the `Routes` and `RouterModule` modules from `@angular/router` and the `AuthGuard` service we created earlier. We define our routes and use the `canActivate` property to specify that the route can only be accessed by authenticated users.

## Handling User Roles
To handle user roles in our Angular application, we can create user roles and restrict access to certain routes based on those roles.

### Creating User Roles
1. In your Angular project, create a new service called "RoleService" using the Angular CLI:

```bash
ng generate service RoleService
```

2. Open the "role.service.ts" file and add the following code:

```typescript
import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class RoleService {
  private roles: string[] = [];

  constructor() {}

  getRoles(): string[] {
    return this.roles;
  }

  setRoles(roles: string[]): void {
    this.roles = roles;
  }

  hasRole(role: string): boolean {
    return this.roles.includes(role);
  }
}
```

In this code, we create a `RoleService` with methods to get the user roles, set the user roles, and check if the user has a specific role.

### Restricting Access based on User Roles
To restrict access to certain routes based on user roles, we can modify the `canActivate` method in our `AuthGuard` service.

1. In your Angular project, open the "auth-guard.service.ts" file and modify the `canActivate()` method as follows:

```typescript
canActivate(): Observable<boolean> {
  return this.afAuth.authState.pipe(
    map((user) => {
      if (user) {
        const roles = this.roleService.getRoles();
        if (roles.includes('admin')) {
          return true;
        } else {
          this.router.navigate(['/access-denied']);
          return false;
        }
      } else {
        this.router.navigate(['/sign-in']);
        return false;
      }
    })
  );
}
```

In this code, we import the `RoleService` and inject it into our `AuthGuard` service. We then check if the user has the "admin" role before allowing access to the route. If the user does not have the "admin" role, they will be redirected to the "access-denied" page.

## Conclusion
In this tutorial, we have learned how to set up and implement Firebase Authentication in an Angular project. We have covered the basics of Firebase Authentication, including sign up, sign in, and sign out functionality, as well as additional features such as resetting passwords, email verification, social media authentication, securing routes, and handling user roles. By following the steps in this tutorial, you should now have a solid foundation for implementing user authentication in your Angular applications using Firebase Authentication.

Learn how to implement Firebase Authentication in Angular applications. Complete guide with step-by-step instructions and code examples.

This article provides a comprehensive guide on implementing Firebase Authentication in Angular applications. It covers topics such as setting up the Angular project, configuring Firebase Authentication, implementing sign up, sign in, and sign out functionality, handling user authentication state, additional authentication features like resetting password and email verification, securing Angular routes with route guards, and handling user roles. If you're looking to add authentication to your Angular app using Firebase, this guide is for you.

Angular and Firebase Authentication: A Complete Guide

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