Spring OAUTH: Override CheckTokenEndpoint 'check_token?token=' response map - spring

Question

I would like to override the CheckTokenEndpoint to provide my own custom output as Map to the resource server. I have tried the following, but not working.
Introducing new custom controller for (/oauth/check_token), but Spring rejects this custom and registers its own.
Overriding bean definition for bean 'checkTokenEndpoint' with a
different definition: replacing [Generic bean: class
[com.datami.auth.security.CheckTokenEndpoint]; scope=singleton;
abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0;
autowireCandidate=true; primary=false; factoryBeanName=null;
factoryMethodName=null; initMethodName=null; destroyMethodName=null;
defined in file
[/usr/local/Cellar/tomcat/8.5.5/libexec/webapps/oauth-server/WEB-INF/classes/com/datami/auth/security/CheckTokenEndpoint.class]]
with [Root bean: class [null]; scope=; abstract=false; lazyInit=false;
autowireMode=3; dependencyCheck=0; autowireCandidate=true;
primary=false;
factoryBeanName=org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerEndpointsConfiguration;
factoryMethodName=checkTokenEndpoint; initMethodName=null;
destroyMethodName=(inferred); defined in class path resource
[org/springframework/security/oauth2/config/annotation/web/configuration/AuthorizationServerEndpointsConfiguration.class]]
Created my own endpoint with (/oauth/check_custom_token) but not sure autowiring resourceServerTokenServices in the below, #autowire doesn't helped me.
#autowire
private ResourceServerTokenServices resourceServerTokenServices;
Spring has autowired this with DefaultTokenServices.
I can also create new DefaultTokenServices() in my code, but then how to autowire the below inside DefaultTokenServices? again the same problem.
private TokenStore tokenStore;
private ClientDetailsService clientDetailsService;
private TokenEnhancer accessTokenEnhancer;
private AuthenticationManager authenticationManager;
Coul you please help me out.

Answer 1

CheckTokenEndpoint depends on its accessTokenConverter instance to create and return the map.
You could create a custom AccessTokenConverter (maybe extending from OOTB DefaultAccessTokenConverter if needed) and use it like so:
#Configuration
#EnableAuthorizationServer
public class MyAuthConfig extends AuthorizationServerConfigurerAdapter {
...
#Override
public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
endpoints.accessTokenConverter(new MyAccessTokenConverter())...
....
Of course, you might want to use a factory method to create your accessTokenConverter instance, which allows you to inject a few properties into the instance etc.
Once done, inside AuthorizationServerEndpointsConfiguration.checkTokenEndpoint you can see that the accessTokenConverter you set above will be passed to the OOTB instance of CheckTokenEndpoint and used to create the map.