What is the process for being directed to the identity server login within an Angular application?

Immediately redirecting users to the identity server upon accessing the application is my goal. Currently, there is a login button that directs users to the ID server with a click, but I want to eliminate this button and have the redirection occur automatically when the application is opened.

Below is the code from my app.component.ts file:

import { OidcSecurityService } from 'angular-auth-oidc-client';

export class AppComponent implements OnInit {

  constructor(private ref: ChangeDetectorRef, public oidcSecurityService: OidcSecurityService) {
  }
  
  ngOnInit() {
    this.oidcSecurityService
    .checkAuth()
    .subscribe((auth) => console.log('is authenticated', auth));
    
  login() {
    this.oidcSecurityService.authorize();
  }
}

And here is the corresponding HTML:

<div>
    <button (click)="login()">Login</button>
</div>

Answer №1

If you're looking for a solid solution, my personal recommendation is to make the switch to angular-oauth2-oidc. Take a look at it here: https://www.npmjs.com/package/angular-oauth2-oidc

To implement this in your app.component.ts file, you can use the following code snippet:

this.oauthService.tryLogin().then((success: boolean) => {
  if (!success) this.oauthService.initCodeFlow();
});

Answer №2

Bring in the Router module and set it up in your constructor with router: Router. Then, use the following code snippet:

this.oidcSecurityService.checkAuth().subscribe((auth) => router.navigateByUrl('Your URL');

Answer №3

If you're facing a problem, consider utilizing an authentication guard by incorporating the CanActivate interface. When canActivate returns false, it cancels route navigation, allowing us to manage user authorization and redirect them to a login page.

For any route that necessitates an authenticated user, simply specify your auth guard in the canActivate property within the route definition:

{ 
    path: 'admin', 
    component: AdminComponent, 
    canActivate: [AuthGuard]
}

Here's the Auth Guard implementation:

@Injectable({
  providedIn: 'root',
})
export class AuthGuard implements CanActivate {
constructor(private oidcSecurityService: OidcSecurityService ) {}

  canActivate(next: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> {
    return this.oidcSecurityService.checkAuth().pipe(
     tap(isAuthenticated => {
         if (!isAuthenticated) {
             this.oidcSecurityService.authorize();
         }
     })
   );
  }

If you require more guidance, refer to the documentation here. However, note that the documentation does not feature an example involving observables.

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