owncloud/core

<?php
/**
 * @author Lukas Reschke <lukas@statuscode.ch>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @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 OC\Updater;

use OCP\Http\Client\IClientService;
use OCP\IConfig;
use OCP\Util;

class VersionCheck {
    /** @var IClientService */
    private $clientService;
    
    /** @var IConfig */
    private $config;

    /**
     * @param IClientService $clientService
     * @param IConfig $config
     */
    public function __construct(
        IClientService $clientService,
        IConfig $config
    ) {
        $this->clientService = $clientService;
        $this->config = $config;
    }

    /**
     * Check if a new version is available
     *
     * @return array|bool
     */
    public function check() {
        // Look up the cache - it is invalidated all 30 minutes
        if (((int)$this->config->getAppValue('core', 'lastupdatedat') + 1800) > \time()) {
            return \json_decode($this->config->getAppValue('core', 'lastupdateResult'), true);
        }

        $updaterUrl = $this->config->getSystemValue('updater.server.url', 'https://updates.owncloud.com/server/');

        $this->config->setAppValue('core', 'lastupdatedat', \time());

        if ($this->config->getAppValue('core', 'installedat', '') === '') {
            $this->config->setAppValue('core', 'installedat', \microtime(true));
        }

        $version = Util::getVersion();
        $version['installed'] = $this->config->getAppValue('core', 'installedat');
        $version['updated'] = $this->config->getAppValue('core', 'lastupdatedat');
        $version['updatechannel'] = \OC_Util::getChannel();
        $version['edition'] = \OC_Util::getEditionString();
        $version['build'] = \OC_Util::getBuild();
        $versionString = \implode('x', $version);

        //fetch xml data from updater
        $url = $updaterUrl . '?version=' . $versionString;

        $tmp = [];
        $xml = $this->getUrlContent($url);
        if ($xml) {
            $loadEntities = \libxml_disable_entity_loader(true);
            $data = @\simplexml_load_string($xml);
            \libxml_disable_entity_loader($loadEntities);
            if ($data !== false) {
                $tmp['version'] = (string)$data->version;
                $tmp['versionstring'] = (string)$data->versionstring;
                $tmp['url'] = (string)$data->url;
                $tmp['web'] = (string)$data->web;
            } else {
                \libxml_clear_errors();
            }
        } else {
            $data = [];
        }

        // Cache the result
        $this->config->setAppValue('core', 'lastupdateResult', \json_encode($data));
        return $tmp;
    }

    /**
     * @codeCoverageIgnore
     * @param string $url
     * @return bool|resource|string
     */
    protected function getUrlContent($url) {
        try {
            $client = $this->clientService->newClient();
            $response = $client->get($url);
            return $response->getBody();
        } catch (\Exception $e) {
            return false;
        }
    }
}