nextcloud/apps/external/ajax/setsites.php

<?php

/**
 * 2012 Frank Karlitschek frank@owncloud.org
 * This file is licensed under the Affero General Public License version 3 or later.
 * See the COPYING-README file.
 */

 
OCP\User::checkAdminUser();

$sites = array();
for ($i = 0; $i < sizeof($_POST['site_name']); $i++) {
	if (!empty($_POST['site_name'][$i]) && !empty($_POST['site_url'][$i])) {
		array_push($sites, array(strip_tags($_POST['site_name'][$i]), strip_tags($_POST['site_url'][$i])));
	}
}

if (sizeof($sites) == 0)
	OC_Appconfig::deleteKey('external', 'sites');
else
	OCP\Config::setAppValue('external', 'sites', json_encode($sites));

echo 'true';
?>