Can't Get Auth Code for Auth0/Okta Angular App Using angular-oauth2-oidc

Can't Get Auth Code with Auth0 and Okta Angular App Using angular-oauth2-oidc: A Comprehensive Guide

In this article, we will explore the typical login flow for an Angular application that uses the angular-oauth2-oidc library in conjunction with either Auth0 or Okta authentication providers. We'll also troubleshoot and provide solutions for the common issue of not receiving an authorization code.

Typical Login Flow

The typical login flow consists of the following steps:

1. User accesses the site: The user navigates to the Angular application running on localhost:4200/.
2. User is redirected: The user is redirected to the Auth0 or Okta authentication server to enter their credentials.
3. Authorization code is generated: Once the user's credentials are verified, an authorization code is generated.
4. User is redirected back: The user is redirected back to the Angular application, and the authorization code is exchanged for an access token.

Troubleshooting: No Authorization Code Received

If you follow the typical login flow and do not receive an authorization code, there could be several potential issues:

• Incorrect client ID: Ensure that the client ID in your Angular application matches the client ID in the Auth0 or Okta dashboard.
• Incorrect issuer: Verify that the issuer URL in your Angular application matches the issuer URL in the Auth0 or Okta dashboard.
• Incorrect scopes: Check that the scopes requested in your Angular application match the allowed scopes in the Auth0 or Okta dashboard.
• Redirect URI mismatch: Make sure that the redirect URI in your Angular application matches the allowed redirect URIs in the Auth0 or Okta dashboard.

Example: Configuring Auth0 with Angular and angular-oauth2-oidc

To configure Auth0 with your Angular application and the angular-oauth2-oidc library, follow these steps:

1. Create an Auth0 application: Log in to your Auth0 dashboard, and create a new application.
2. Configure Angular application: In your Angular application, install the angular-oauth2-oidc library:

   npm install angular-oauth2-oidc

   Configure your Angular application with the Auth0 settings. In your app.module.ts file:

   import { NgModule, } from '@angular/core';
   import { AuthModule } from 'angular-oauth2-oidc';
   
   @NgModule({
     imports: [
       AuthModule.forRoot({
         config: {
           issuer: 'https://your-auth0-domain.auth0.com',
           clientId: 'your-client-id',
           redirectUri: 'http://localhost:4200/',
           scope: 'openid profile email',
           disableAtHash: true,
         },
       }),
     ],
   })
   export class AppModule { }
   

3. Configure Auth0 login: To configure Auth0 login, you need an Auth0 guard to protect specific routes. In your app-routing.module.ts file:

   import { NgModule } from '@angular/core';
   import { Routes, RouterModule, CanActivate } from '@angular/router';
   import { AuthGuard } from './auth.guard';
   
   const routes: Routes = [
     {
       path: 'profile',
       component: ProfileComponent,
       canActivate: [AuthGuard],
     },
   ];
   
   @NgModule({
     imports: [RouterModule.forRoot(routes)],
     exports: [RouterModule],
   })
   export class AppRoutingModule { }
   

   Now, create the AuthGuard:

   import { Injectable } from '@angular/core';
   import {
     AuthConfig,
     AuthState,
     AuthAction,
     AuthActions,
     OAuthService,
   } from 'angular-oauth2-oidc';
   import { Router, CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
   
   @Injectable()
   export class AuthGuard implements CanActivate {
     constructor(
       private router: Router,
       private oauthService: OAuthService,
     ) {}
   
     canActivate(
       next: ActivatedRouteSnapshot,
       state: RouterStateSnapshot
     ): boolean {
       if (this.oauthService.hasValidAccessToken()) {
         return true;
       }
       this.router.navigate(['/login']);
       return false;
     }
   }
   

References

• TypeScript: typescriptlang.org
• Angular: angular.io
• angular-oauth2-oidc: github.com/manfredsteyer/angular-oauth2-oidc
• Auth0: auth0.com
• Okta: developer.okta.com

By following the steps outlined above, you should be able to resolve the common issue of not receiving an authorization code with Auth0 and Okta Angular Apps using the angular-oauth2-oidc library. Happy coding!