Spring Instagram clone (Facebook login - OAuth)

OAuth2DetailsService

Get facebook social username, email, name and process password -> build

public class OAuth2DetailsService extends DefaultOAuth2UserService {

    private final UserRepository userRepository;

    @Override
    public OAuth2User loadUser(OAuth2UserRequest userRequest) throws OAuth2AuthenticationException {

        OAuth2User oAuth2User = super.loadUser(userRequest);

        Map<String, Object> userInfo = oAuth2User.getAttributes();

        String username = "facebook_" + (String) userInfo.get("id");
        String password = new BCryptPasswordEncoder().encode(UUID.randomUUID().toString());
        String email = (String) userInfo.get("email");
        String name = (String) userInfo.get("name");

        User userEntity = userRepository.findByUsername(username);
        if(userEntity == null) {
            User user = User.builder()
                    .username(username)
                    .password(password)
                    .email(email)
                    .name(name)
                    .role("ROLE_USER")
                    .build();
            return new PrincipalDetails(userRepository.save(user), oAuth2User.getAttributes());
        } else {
            return new PrincipalDetails(userEntity, oAuth2User.getAttributes());
        }
    }

}

Make an overload

public PrincipalDetails(User user, Map<String, Object> attributes) {
        this.user = user;
    }

Catch the facebook login users to append at PrincipalDetails data.