OAuthService not registered for DI if used in custom wrapper library

Describe the bug OAuthService cannot be resolved by dependency injection. I have the need to provide a custom wrapper around your API for company specific use cases. Therefore I want to use this library through a self written library.

Angular Project A should use OpenId

MyOpenIdWrapper is a wrapper around this library.

OAuthService is only used within MyOpenIdWrapper and cannot be resolved inside a service in the MyOpenIdWrapper library.

Using this library directly in Angular Project A is no problem.

Stackblitz example Not provided, since it would require a custom library in between.

To Reproduce Steps to reproduce the behavior:

1. Create a library project
2. Add a simple wrapper for initialization of the client
3. Create an application project
4. Include the library into the application
5. Try to call the wrapper from the application.
6. Exception that OAuthService is not registerd

Expected behavior Possibility to use the library through a custom wrapper library.

Desktop (please complete the following information):

• OS: Windows
• Browser chrome
• Version 81.0.4044.122 (Official Build) (64-bit)

Additional context The following change fixes the Problem: Change

@Injectable()

to

@Injectable({
  providedIn: 'root'
})

in oauth-service.ts and remove OAuthService registration from angular-oauth-oidc.module.ts

[steffbeckers]

@steffbeckers do you mind sharing your implementation code snippet or gist?

@ruvan83, the following solution worked for me, not sure if this is a best practice. I’ve added the following provider to the module where the OAuthModule.forRoot() is imported:

@NgModule({
  imports: [
    OAuthModule.forRoot()
  ],
  providers: [
    {
      provide: 'OAUTH_SERVICE',
      useExisting: OAuthService
    }
  ]
})
export class AppModule {}

You can now inject the OAuthService in another library (which is used by the app) using the existing instance of the service.

@Injectable()
export class SomeServiceInOtherLib {
  constructor(@Inject('OAUTH_SERVICE') private oAuthService: OAuthService) {}
}

For the ‘OAUTH_SERVICE’ string you could also use an injection token: https://angular.io/api/core/InjectionToken

I hope this works for you 😄

[ruvan83]

@steffbeckers do you mind sharing your implementation code snippet or gist?