我希望能够将其他参数从客户端传递到oauth2用户服务。在这个Spring之后https://docs.spring.io/spring-security/site/docs/5.1.1.release/reference/htmlsingle/#oauth2client-授权请求解析器，我可以向oauth2authorizationrequest添加额外的参数。当我尝试在自定义defaultoauth2userservice中检索参数时，它不再是oauth2userrequest的一部分。
我认为这个问题与oauth2authorizationrequest的resolve方法有关，它被调用了两次，第二次authorizationrequest为null。请参阅下面的调试日志
关于如何解决这个问题有什么建议吗？
客户请求

http://localhost:8080/oauth2/authorize/github?redirect_uri=http://localhost:3000/oauth2/redirect&action=signup

详细日志

CustomAuthorizationRequestResolver : in CustomAuthorizationRequestResolver.resolve() authorizationRequest is [Initialized]
CustomAuthorizationRequestResolver: action parameter from HttpServletRequest is [signup]
CustomAuthorizationRequestResolver: number of additional parameters added to OAuth2AuthorizationRequest is [1]
CustomAuthorizationRequestResolver: in CustomAuthorizationRequestResolver.resolve() authorizationRequest is [null]
CustomOAuth2UserService: in CustomOAuth2UserService.loadUser() size of additional parameters [0]

customauthorizationrequestresolver

public class CustomAuthorizationRequestResolver implements OAuth2AuthorizationRequestResolver {
    private final static Logger logger = LoggerFactory.getLogger(CustomAuthorizationRequestResolver.class);
    private final OAuth2AuthorizationRequestResolver defaultAuthorizationRequestResolver;

    public CustomAuthorizationRequestResolver(ClientRegistrationRepository clientRegistrationRepository) {
        this.defaultAuthorizationRequestResolver = new DefaultOAuth2AuthorizationRequestResolver(clientRegistrationRepository,
                "/oauth2/authorize");
    }

    @Override
    public OAuth2AuthorizationRequest resolve(HttpServletRequest request) {
        OAuth2AuthorizationRequest authorizationRequest = this.defaultAuthorizationRequestResolver.resolve(request);
        logger.debug("in CustomAuthorizationRequestResolver.resolve() authorizationRequest is [{}]", 
            authorizationRequest == null ? "null" : "Initialized");
        return authorizationRequest != null ? customAuthorizationRequest(request, authorizationRequest) : null;
    }

    @Override
    public OAuth2AuthorizationRequest resolve(HttpServletRequest request, String clientRegistrationId) {
        OAuth2AuthorizationRequest authorizationRequest = this.defaultAuthorizationRequestResolver.resolve(
                request, clientRegistrationId);
        return authorizationRequest != null ? customAuthorizationRequest(request, authorizationRequest) : null;
    }

    private OAuth2AuthorizationRequest customAuthorizationRequest(HttpServletRequest request,
            OAuth2AuthorizationRequest authorizationRequest) {
        String action = request.getParameter("action");
        logger.debug("action parameter from HttpServletRequest is [{}]", action);

        Map<String, Object> additionalParameters = new LinkedHashMap<>(authorizationRequest.getAdditionalParameters());
        additionalParameters.put("action", action);

        OAuth2AuthorizationRequest rtn = OAuth2AuthorizationRequest.from(authorizationRequest).additionalParameters(
                additionalParameters).build();

        logger.debug("number of additional parameters added to OAuth2AuthorizationRequest is [{}]", rtn.getAdditionalParameters()
                .size());

        return rtn;
    }
}

customoauth2userservice

public class CustomOAuth2UserService extends DefaultOAuth2UserService {
    private final Logger logger = LoggerFactory.getLogger(CustomOAuth2UserService.class);

    @Autowired
    private UserRepository userRepository;

    @Override
    public OAuth2User loadUser(OAuth2UserRequest oAuth2UserRequest) throws OAuth2AuthenticationException {
        OAuth2User oAuth2User = super.loadUser(oAuth2UserRequest);

        logger.debug("in CustomOAuth2UserService.loadUser() size of additional parameters [{}]", oAuth2UserRequest
                .getAdditionalParameters().size());
        // other processing
    }

    // other methods
}