## Relevant articles:

- [Spring Security 5 -OAuth2 Login](http://www.baeldung.com/spring-security-5-oauth2-login)
- [Extra Login Fields with Spring Security](https://github.com/eugenp/tutorials/tree/master/spring-5-security)
- [A Custom Spring SecurityConfigurer](http://www.baeldung.com/spring-security-custom-configurer)