nextcloud-server/apps/user_ldap/ajax/setConfiguration.php

<?php
/**
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 *
 * @author Arthur Schiwon <blizzz@arthur-schiwon.de>
 * @author Christoph Wurst <christoph@winzerhof-wurst.at>
 * @author Joas Schilling <coding@schilljs.com>
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Roeland Jago Douma <roeland@famdouma.nl>
 *
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program. If not, see <http://www.gnu.org/licenses/>
 *
 */
// Check user and app status
\OC_JSON::checkAdminUser();
\OC_JSON::checkAppEnabled('user_ldap');
\OC_JSON::callCheck();

$prefix = (string)$_POST['ldap_serverconfig_chooser'];

// Checkboxes are not submitted, when they are unchecked. Set them manually.
// only legacy checkboxes (Advanced and Expert tab) need to be handled here,
// the Wizard-like tabs handle it on their own
$chkboxes = ['ldap_configuration_active', 'ldap_override_main_server',
	'ldap_turn_off_cert_check'];
foreach ($chkboxes as $boxid) {
	if (!isset($_POST[$boxid])) {
		$_POST[$boxid] = 0;
	}
}

$ldapWrapper = new OCA\User_LDAP\LDAP();
$connection = new \OCA\User_LDAP\Connection($ldapWrapper, $prefix);
$connection->setConfiguration($_POST);
$connection->saveConfiguration();
\OC_JSON::success();