server/apps/updatenotification/controller/admincontroller.php

<?php
/**
 * @author Lukas Reschke <lukas@owncloud.com>
 *
 * @copyright Copyright (c) 2016, ownCloud, Inc.
 * @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/>
 *
 */

namespace OCA\UpdateNotification\Controller;

use OCP\AppFramework\Controller;
use OCP\AppFramework\Http\DataResponse;
use OCP\AppFramework\Http\TemplateResponse;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\BackgroundJob\IJobList;
use OCP\IConfig;
use OCP\IRequest;
use OCP\Security\ISecureRandom;

class AdminController extends Controller {
	/** @var IJobList */
	private $jobList;
	/** @var ISecureRandom */
	private $secureRandom;
	/** @var IConfig */
	private $config;
	/** @var ITimeFactory */
	private $timeFactory;

	/**
	 * @param string $appName
	 * @param IRequest $request
	 * @param IJobList $jobList
	 * @param ISecureRandom $secureRandom
	 * @param IConfig $config
	 * @param ITimeFactory $timeFactory
	 */
	public function __construct($appName,
								IRequest $request,
								IJobList $jobList,
								ISecureRandom $secureRandom,
								IConfig $config,
								ITimeFactory $timeFactory) {
		parent::__construct($appName, $request);
		$this->jobList = $jobList;
		$this->secureRandom = $secureRandom;
		$this->config = $config;
		$this->timeFactory = $timeFactory;
	}

	/**
	 * @return TemplateResponse
	 */
	public function displayPanel() {
		return new TemplateResponse($this->appName, 'admin', [], '');
	}

	/**
	 * @return DataResponse
	 */
	public function createCredentials() {
		// Create a new job and store the creation date
		$this->jobList->add('OCA\UpdateNotification\ResetTokenBackgroundJob');
		$this->config->setAppValue('core', 'updater.secret.created', $this->timeFactory->getTime());

		// Create a new token
		$newToken = $this->secureRandom->generate(64);
		$this->config->setSystemValue('updater.secret', password_hash($newToken, PASSWORD_DEFAULT));

		return new DataResponse($newToken);
	}
}