apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/configuration/AuthConfiguration.java/AuthConfiguration/SpringSecurityLDAPConfigurer
class AuthConfiguration:    public SpringSecurityLDAPConfigurer(final LdapProperties ldapProperties,
        final LdapContextSource ldapContextSource,
        final LdapExtendProperties ldapExtendProperties) {
      this.ldapProperties = ldapProperties;
      this.ldapContextSource = ldapContextSource;
      this.ldapExtendProperties = ldapExtendProperties;
    }