我想自定义Spirng Oauth2授权服务器的端点

Question

我想将我的自定义端点添加到spring oauth2授权服务器，并且我创建一个端点

@FrameworkEndpoint
public class LoginEndpoint extends AbstractEndpoint {

    @Autowired
    private AuthenticationManager authenticationManager;

    @RequestMapping("/sys/username")
    public ResponseEntity<OAuth2AccessToken> login(Principal principal, @RequestParam Map<String, String> parameters) {
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();

        UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = new UsernamePasswordAuthenticationToken("", "");

    }
}

并像

一样注册到授权服务器

    @Bean
    public LoginEndpoint loginEndpoint() throws Exception {
        LoginEndpoint tokenEndpoint = new LoginEndpoint();
        tokenEndpoint.setClientDetailsService(clientDetailsService);
        tokenEndpoint.setProviderExceptionHandler(configuration.getEndpointsConfigurer().getExceptionTranslator());
        tokenEndpoint.setTokenGranter(configuration.getEndpointsConfigurer().getTokenGranter());
        tokenEndpoint.setOAuth2RequestFactory(configuration.getEndpointsConfigurer().getOAuth2RequestFactory());
//        tokenEndpoint.setOAuth2RequestValidator(configuration.getEndpointsConfigurer().getOAuth2RequestValidator());
//        tokenEndpoint.setAllowedRequestMethods(configuration.getEndpointsConfigurer().getAllowedTokenEndpointRequestMethods());
        return tokenEndpoint;
    }

但是，我为此进行调试，并且principal为null，因此如何在@Requstmapping("/sys/username")之前使用clientId和client secret保护该配置。