Role-based Authentication in Angular 15
Role-based authentication is a crucial aspect of most web applications, as it ensures that only authorized users have access to certain resources and functionalities. In this article, we will explore how to implement role-based authentication in an Angular 15 application, and how to call APIs using the Angular HTTP service.
Setting up Role-based Authentication
To start with, we need to define the roles that will be used in our application. This can be done by creating a role enum or a constant array of roles in a dedicated file. For example:
export enum Role {
Admin = 'Admin',
User = 'User',
Guest = 'Guest'
}
Next, we need to create a service that will handle the authentication logic. This service will be responsible for storing the current user’s role and verifying access to certain resources based on their role. It can also handle the logic for logging in and logging out. Here’s an example of how this service might look like:
export class AuthService {
private currentUserSubject: BehaviorSubject
public currentUser: Observable
constructor(private http: HttpClient) {
this.currentUserSubject = new BehaviorSubject
this.currentUser = this.currentUserSubject.asObservable();
}
public get currentUserValue(): User {
return this.currentUserSubject.value;
}
login(username: string, password: string) {
// ... logic to authenticate user
}
logout() {
// ... logic to log user out
}
hasRole(role: Role): boolean {
// ... logic to check if user has the specified role
}
}
Calling APIs Using the HTTP Service
Once the role-based authentication is set up, we can then use the Angular HTTP service to call APIs and retrieve data. Here’s an example of how to make a GET request to an API endpoint:
import { HttpClient } from '@angular/common/http';
export class MyDataService {
constructor(private http: HttpClient) { }
getData() {
return this.http.get('/api/data');
}
}
With the above service, we can then use it in our components to fetch data from the API and display it to the user.
Conclusion
Role-based authentication is an important aspect of modern web applications, and Angular 15 provides the tools and utilities to easily implement this functionality. By using the Angular HTTP service, we can also make API calls to retrieve data and integrate it into our application. With these features, we can build secure and robust web applications that cater to the needs of different user roles.
Helpful video
bro, what language are you speaking? 😯