Add custom UserDetailsService to Spring Security OAuth2 app

Question

How do I add the custom UserDetailsService below to this Spring OAuth2 sample?

The default user with default password is def

Answer 1

My requirement was to get a database object off the back of the oauth2 email attribute. I found this question as I assumed that I need to create a custom user details service. Actually I need to implment the OidcUser interface and hook into that process.

Initially I thought it was the OAuth2UserService, but I've set up my AWS Cognito authentication provider so that it's open id connect..

//inside WebSecurityConfigurerAdapter

http
.oauth2Login()
.userInfoEndpoint()
.oidcUserService(new CustomOidcUserServiceImpl());

...

public class CustomOidcUserServiceImpl implements OAuth2UserService {

    private OidcUserService oidcUserService = new OidcUserService();

    @Override
    public OidcUser loadUser(OidcUserRequest userRequest) throws OAuth2AuthenticationException {
        OidcUser oidcUser = oidcUserService.loadUser(userRequest);
        return new CustomUserPrincipal(oidcUser);
    }
}

...

public class CustomUserPrincipal implements OidcUser {

    private OidcUser oidcUser;

    //forward all calls onto the included oidcUser
}

The custom service is where any bespoke logic can go. I plan on implementing UserDetails interface on my CustomUserPrincipal so that I can have different authentication mechanisms for live and test to facilitate automated ui testing.