Add daily cron job to sync system address book

apps/dav/appinfo/app.php

@@ -24,6 +24,7 @@ use OCA\DAV\CardDAV\SyncService;
 
 $app = new \OCA\Dav\AppInfo\Application();
 $app->registerHooks();
+$app->setupCron();
 
 \OC::$server->registerService('CardDAVSyncService', function() use ($app) {
 

apps/dav/appinfo/application.php

@@ -22,6 +22,7 @@ namespace OCA\Dav\AppInfo;
 
 use OCA\DAV\CardDAV\CardDavBackend;
 use OCA\DAV\CardDAV\ContactsManager;
+use OCA\DAV\CardDAV\SyncJob;
 use OCA\DAV\CardDAV\SyncService;
 use OCA\DAV\HookManager;
 use \OCP\AppFramework\App;
@@ -94,4 +95,9 @@ class Application extends App {
 		return $this->getContainer()->query('SyncService');
 	}
 
+	public function setupCron() {
+		$jl = $this->getContainer()->getServer()->getJobList();
+		$jl->add(new SyncJob());
+	}
+
 }

apps/dav/lib/carddav/syncjob.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * @author Thomas Müller <thomas.mueller@tmit.eu>
+ *
+ * @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\DAV\CardDAV;
+
+use OC\BackgroundJob\TimedJob;
+use OCA\Dav\AppInfo\Application;
+
+class SyncJob extends TimedJob {
+
+	public function __construct() {
+		// Run once a day
+		$this->setInterval(24 * 60 * 60);
+	}
+
+	protected function run($argument) {
+		$app = new Application();
+		/** @var SyncService $ss */
+		$ss = $app->getSyncService();
+		$ss->syncInstance();
+	}
+}

apps/dav/lib/carddav/syncservice.php

@@ -240,11 +240,13 @@ class SyncService {
 		return $this->localSystemAddressBook;
 	}
 
-	public function syncInstance(\Closure $progressCallback) {
+	public function syncInstance(\Closure $progressCallback = null) {
 		$systemAddressBook = $this->getLocalSystemAddressBook();
 		$this->userManager->callForAllUsers(function($user) use ($systemAddressBook, $progressCallback) {
 			$this->updateUser($user);
-			$progressCallback();
+			if (!is_null($progressCallback)) {
+				$progressCallback();
+			}
 		});
 
 		// remove no longer existing