nextcloud/apps/files_encryption/ajax/adminrecovery.php

<?php

/**
 * Copyright (c) 2013, Sam Tuke <samtuke@owncloud.com>
 * This file is licensed under the Affero General Public License version 3 or later.
 * See the COPYING-README file.
 *
 * @brief Script to handle admin settings for encrypted key recovery
 */
use OCA\Encryption;

\OCP\JSON::checkAdminUser();
\OCP\JSON::checkAppEnabled('files_encryption');
\OCP\JSON::callCheck();

$l = OC_L10N::get('files_encryption');

$return = false;
$action = '';
// Enable recoveryAdmin

$recoveryKeyId = OC_Appconfig::getValue('files_encryption', 'recoveryKeyId');

if (isset($_POST['adminEnableRecovery']) && $_POST['adminEnableRecovery'] === "1") {

	$return = \OCA\Encryption\Helper::adminEnableRecovery($recoveryKeyId, $_POST['recoveryPassword']);
	$action = $l->t('enable');

// Disable recoveryAdmin
} elseif (
	isset($_POST['adminEnableRecovery'])
	&& "0" === $_POST['adminEnableRecovery']
) {
	$return = \OCA\Encryption\Helper::adminDisableRecovery($_POST['recoveryPassword']);
	$action = $l->t('disable');
}

// Return success or failure
if ($return) {
	\OCP\JSON::success(array("data" => array("message" => $l->t('Recovery key successfully %sd', array($action)))));
} else {
	\OCP\JSON::error(array(
						  "data" => array(
							  "message" => $l->t(
								  'Could not %s recovery key. Please check your recovery key password!', array($action))
						  )
					 ));
}