Improve the provide function in order to allow passing a factory function

EXAMPLES.md

@@ -1,14 +1,20 @@
 # Examples using auth0-angular
 
-- [Add login to your application](#add-login-to-your-application)
-- [Add logout to your application](#add-logout-to-your-application)
-- [Checking if a user is authenticated](#checking-if-a-user-is-authenticated)
-- [Display the user profile](#display-the-user-profile)
-- [Protect a route](#protect-a-route)
-- [Call an API](#call-an-api)
-- [Handling errors](#handling-errors)
-- [Organizations](#organizations)
-- [Standalone Components and a more functional approach](#standalone-components-and-a-more-functional-approach)
+- [Examples using auth0-angular](#examples-using-auth0-angular)
+  - [Add login to your application](#add-login-to-your-application)
+  - [Add logout to your application](#add-logout-to-your-application)
+  - [Checking if a user is authenticated](#checking-if-a-user-is-authenticated)
+  - [Display the user profile](#display-the-user-profile)
+  - [Protect a route](#protect-a-route)
+  - [Call an API](#call-an-api)
+    - [Specify the audience](#specify-the-audience)
+    - [Register AuthHttpInterceptor](#register-authhttpinterceptor)
+    - [Configure AuthHttpInterceptor to attach access tokens](#configure-authhttpinterceptor-to-attach-access-tokens)
+  - [Handling errors](#handling-errors)
+  - [Organizations](#organizations)
+    - [Log in to an organization](#log-in-to-an-organization)
+    - [Accept user invitations](#accept-user-invitations)
+  - [Standalone components and a more functional approach](#standalone-components-and-a-more-functional-approach)
 
 ## Add login to your application
 
@@ -157,7 +163,7 @@ import { AuthModule } from '@auth0/auth0-angular';
       clientId: 'YOUR_AUTH0_CLIENT_ID',
       authorizationParams: {
         audience: 'YOUR_AUTH0_API_IDENTIFIER',
-      }
+      },
     }),
   ],
   // ...
@@ -278,7 +284,7 @@ AuthModule.forRoot({
           authorizationParams: {
             audience: 'http://my-api/',
             scope: 'write:orders',
-          }
+          },
         },
       },
     ],
@@ -381,6 +387,7 @@ export class AppComponent {
 ```
 
 ## Standalone components and a more functional approach
+
 As of Angular 15, the Angular team is putting standalone components, as well as a more functional approach, in favor of the traditional use of NgModules and class-based approach.
 
 There are a couple of difference with how you would traditionally implement our SDK:
@@ -398,18 +405,31 @@ const routes: Routes = [
     path: 'profile',
     component: ProfileComponent,
     canActivate: [authGuardFn],
-  }
+  },
 ];
 
 bootstrapApplication(AppComponent, {
-  providers: [
-    provideRouter(routes),
-    provideAuth0(/* Auth Config Goes Here */),
-    provideHttpClient(
-      withInterceptors([authHttpInterceptorFn])
-    ) 
-  ]
+  providers: [provideRouter(routes), provideAuth0(/* Auth Config Goes Here */), provideHttpClient(withInterceptors([authHttpInterceptorFn]))],
 });
 ```
 
 Note that `provideAuth0` should **never** be provided to components, but only at the root level of your application.
+
+`AuthConfig` can be omitted or it can be provided either as a basic config object, or a function that returns a config object:
+
+```ts
+provideAuth0({
+  clientId: 'clientId',
+  domain: 'domain',
+}),
+  // or
+  provideAuth0(() => {
+    const someProvider = inject(SomeProvider);
+    // you can inject as many providers as you want
+    return {
+      clientId: 'clientId',
+      domain: 'domain',
+      // use someProvider (or other porviders) to build your config object
+    };
+  });
+```

projects/auth0-angular/src/lib/provide.ts

@@ -5,6 +5,8 @@ import { AuthGuard } from './auth.guard';
 import { AuthHttpInterceptor } from './auth.interceptor';
 import { AuthService } from './auth.service';
 
+type AuthConfigFactory = () => AuthConfig;
+
 /**
  * Initialize the authentication system. Configuration can either be specified here,
  * or by calling AuthClientConfig.set (perhaps from an APP_INITIALIZER factory function).
@@ -20,19 +22,25 @@ import { AuthService } from './auth.service';
  *   ],
  * });
  */
-export function provideAuth0(config?: AuthConfig): Provider[] {
+export function provideAuth0(
+  config?: AuthConfig | AuthConfigFactory
+): Provider[] {
   return [
     AuthService,
     AuthHttpInterceptor,
     AuthGuard,
-    {
-      provide: AuthConfigService,
-      useValue: config,
-    },
+    provideAuthConfigService(config),
     {
       provide: Auth0ClientService,
       useFactory: Auth0ClientFactory.createClient,
       deps: [AuthClientConfig],
     },
   ];
 }
+
+function provideAuthConfigService(config?: AuthConfig | AuthConfigFactory) {
+  const provide = AuthConfigService;
+  return typeof config === 'function'
+    ? { provide, useFactory: config }
+    : { provide, useValue: config };
+}