apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/configuration/AuthConfiguration.java/AuthConfiguration/springSecurityUserInfoHolder
class AuthConfiguration:    @Bean
    @ConditionalOnMissingBean(UserInfoHolder.class)
    public UserInfoHolder springSecurityUserInfoHolder(UserService userService) {
      return new SpringSecurityUserInfoHolder(userService);
    }