import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class ExampleController {

	@GetMapping("/")
	public Object index() {
		return getCurrentUser();
	}


	public Object getCurrentUser() {
		Authentication auth = SecurityContextHolder.getContext().getAuthentication();
		return auth.getPrincipal();
	}

}