How can I utilize the code flow for authentication with angular-oauth2-oidc in Angular 8?

Currently, I am utilizing the oAuth2 framework by following this documentation:

I am specifically using the authentication flow grant method.

In my application, there is a main page where users can click a button to be redirected to the authentication server. Upon entering their credentials, they are then redirected to a temporary page where I need to extract the authorization code to obtain the access token.

However, I am currently facing challenges in extracting the code from the temporary page.

I have a couple of questions:

  1. How can I implement the process of obtaining the access code and subsequently retrieving the access token?
  2. After acquiring the access token, how do I redirect the user back to the home page of the application?

-

This is the desired workflow:

Prelogin -> authentication server login page -> post-login processing -> application home page

-

PreLoginComponent.ts:

export class PreLoginComponent implements OnInit {
  constructor(private oauthService: OAuthService) {}

  ngOnInit() {}

  public login() {
    this.oauthService.initCodeFlow();
  }
}

authConfig.ts:

export const authConfig: AuthConfig = {

  responseType: environment.authRequestType,

  loginUrl: environment.authServerUrl,

  redirectUri: environment.redirectUrl,

  clientId: environment.clientId,

  scope: environment.scope,

  requireHttps: false,

  showDebugInformation: true
};

AppComponent.ts:

import { OAuthService, JwksValidationHandler } from 'angular-oauth2-oidc';
import { authConfig } from './core/authentication/auth.config';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit, OnDestroy {

  constructor(
    private oauthService: OAuthService
  ) {
    this.configure();
  }

  ngOnInit() {
    }

  private configure() {
    this.oauthService.configure(authConfig);
    this.oauthService.tokenValidationHandler = new JwksValidationHandler();
  }
}

PostLoginComponent.ts:

import { Component, OnInit } from '@angular/core';
import { OAuthService, JwksValidationHandler } from 'angular-oauth2-oidc';

@Component({
  selector: 'app-post-login',
  templateUrl: './post-login.component.html',
  styleUrls: ['./post-login.component.scss']
})
export class PostLoginComponent implements OnInit {
  constructor(private oauthService: OAuthService) {

  }

  ngOnInit() {
  // How can I capture the code for access token and handle redirection upon success?
  // This may involve using the method this.oauthService.tryLoginCodeFlow();
  }
}

Answer №1

Are you referring to the Authorization Code Grant method? If so, I have personally found it very helpful to refer back to the official standard for guidance: https://www.rfc-editor.org/rfc/rfc6749#section-4.1

To address your specific questions:

  1. How can I implement obtaining the access code and getting the access token?

In theory, the page you are redirected to is within your domain's control. The authorization code will be passed in the URL during redirection, allowing you to extract it from there. Refer to step C) in the provided link.

  1. How do I redirect to the homepage after acquiring the access token?

Once again, since the redirect page belongs to your domain, you have options such as performing a 301 redirect to your homepage or executing the entire process in another window (common practice), closing it upon reaching the redirect page...

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