getSearchDn example

$presentedPassword = $passwordCredentials->getPassword();
        if ('' === $presentedPassword) {
            throw new BadCredentialsException('The presented password cannot be empty.');
        }

        $user = $passport->getUser();

        /** @var LdapInterface $ldap */
        $ldap = $this->ldapLocator->get($ldapBadge->getLdapServiceId());
        try {
            if ($ldapBadge->getQueryString()) {
                if ('' !== $ldapBadge->getSearchDn() && '' !== $ldapBadge->getSearchPassword()) {
                    try {
                        $ldap->bind($ldapBadge->getSearchDn(), $ldapBadge->getSearchPassword());
                    } catch (InvalidCredentialsException) {
                        throw new InvalidSearchCredentialsException();
                    }
                } else {
                    throw new LogicException('Using the "query_string" config without using a "search_dn" and a "search_password" is not supported.');
                }
                $identifier = $ldap->escape($user->getUserIdentifier(), '', LdapInterface::ESCAPE_FILTER);
                $query = str_replace('{user_identifier}', $identifier, $ldapBadge->getQueryString());
                $result = $ldap->query($ldapBadge->getDnString(), $query)->execute();