#获取当前用户及扩展

public PigxUser getUser(Authentication authentication) {
  Object principal = authentication.getPrincipal();
  if (principal instanceof PigUser) {
    return (PigxUser) principal;
  }
  return null;
}

public class PigCustomOpaqueTokenIntrospector implements OpaqueTokenIntrospector {

  private final OAuth2AuthorizationService authorizationService;

  @Override
  public OAuth2AuthenticatedPrincipal introspect(String token) {
    OAuth2Authorization oldAuthorization = authorizationService.findByToken(token, OAuth2TokenType.ACCESS_TOKEN);
    if (Objects.isNull(oldAuthorization)) {
      throw new InvalidBearerTokenException(token);
    }

    // 客户端模式默认返回
    if (AuthorizationGrantType.CLIENT_CREDENTIALS.equals(oldAuthorization.getAuthorizationGrantType())) {
      return new PigClientCredentialsOAuth2AuthenticatedPrincipal(
        oldAuthorization.getAttributes(),
        AuthorityUtils.NO_AUTHORITIES,
        oldAuthorization.getPrincipalName()
      );
    }

    Map<String, PigxUserDetailsService> userDetailsServiceMap = SpringContextHolder
      .getBeansOfType(PigxUserDetailsService.class);

    Optional<PigxUserDetailsService> optional = userDetailsServiceMap.values().stream()
      .filter(service -> service.support(
        Objects.requireNonNull(oldAuthorization).getRegisteredClientId(),
        oldAuthorization.getAuthorizationGrantType().getValue()
      ))
      .max(Comparator.comparingInt(Ordered::getOrder));

    UserDetails userDetails = null;
    try {
      Object principal = Objects.requireNonNull(oldAuthorization).getAttributes().get(Principal.class.getName());
      UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = (UsernamePasswordAuthenticationToken) principal;
      Object tokenPrincipal = usernamePasswordAuthenticationToken.getPrincipal();
      userDetails = optional.get().loadUserByUser((PigxUser) tokenPrincipal);
    }
    catch (UsernameNotFoundException notFoundException) {
      log.warn("用户不存在 {}", notFoundException.getLocalizedMessage());
      throw notFoundException;
    }
    catch (Exception ex) {
      log.error("资源服务器 introspect Token error {}", ex.getLocalizedMessage());
    }
    return (PigxUser) userDetails;
  }
}

@Inner
@GetMapping("/info/{username}")
public R<UserInfo> info(@PathVariable("username") String username) {
  // ...
}

public class PigxUser extends User {
  @Getter
  private String newField; // 新增字段

  public PigxUser(String newField, ...) {
    super(...);
    this.newField = newField;
  }
}

private UserDetails getUserDetails(R<UserInfo> result) {
  // newField 从 remoteUserService.info 查询返回的 UserInfo 中获取
  return new PigxUser(newField, ...);
}