Angular Complete Role Based Authentication Tutorial

Role-based authentication is an important aspect of web applications, especially when dealing with user roles and permissions. In this tutorial, we will explore how to implement role-based authentication using the Angular framework.

Prerequisites

Before we get started, make sure you have the following installed:

• Node.js
• Angular CLI
• An IDE of your choice (e.g., Visual Studio Code)

Step 1: Set up a new Angular project

Open your terminal or command prompt and navigate to the desired directory for your project. Run the following command to create a new Angular project:

“`bash
ng new role-based-authentication-tutorial
“`

Navigate to the project directory:

“`bash
cd role-based-authentication-tutorial
“`

Start the application:

“`bash
ng serve
“`

Visit “http://localhost:4200” in your browser to verify that the project is running successfully.

Step 2: Create the authentication service

In this step, we will create a service that handles authentication logic. Run the following command to generate a new service:

“`bash
ng generate service auth
“`

Open the newly created “auth.service.ts” file in your IDE. Implement the necessary methods, such as login, logout, and isAuthenticated.

Step 3: Create the authentication guard

In this step, we will create a guard to protect routes based on user roles. Run the following command to generate a new guard:

“`bash
ng generate guard auth
“`

Open the newly created “auth.guard.ts” file in your IDE. Implement the canActivate method to check if the user has the required role to access a particular route.

Step 4: Create the user service

Next, we will create a service to manage user-related operations. Run the following command to generate a new service:

“`bash
ng generate service user
“`

Open the newly created “user.service.ts” file in your IDE. Implement methods to retrieve user information, such as getUserById and getUserRoles.

Step 5: Implement the login and registration components

In this step, we will create the login and registration components. Run the following commands to generate these components:

“`bash
ng generate component login
ng generate component registration
“`

Open the newly created component files in your IDE. Implement the necessary logic to handle user login and registration.

Step 6: Implement protected routes

Now, let’s create some protected routes that can only be accessed by authenticated users with specific roles. Open the “app-routing.module.ts” file in your IDE and modify the routes to include the authentication guard.

Step 7: Display user-specific content

Finally, let’s update our components to display user-specific content based on their roles. Use Angular’s structural directives (e.g., *ngIf) to conditionally show or hide content based on user roles.

Conclusion

Implementing role-based authentication in Angular is crucial for building secure web applications. In this tutorial, we learned how to create an authentication service, guard, and user service, as well as how to implement protected routes and display user-specific content. This is just the beginning, and you can enhance the authentication system further based on your application requirements.