add lookup route for displaynames

core/routes.php

@@ -35,6 +35,10 @@ $this->create('core_ajax_share', '/core/ajax/share.php')
 // Translations
 $this->create('core_ajax_translations', '/core/ajax/translations.php')
 	->actionInclude('core/ajax/translations.php');
+// User display names
+$this->create('core_user_displaynames', '/displaynames')
+	->get()
+	->action('OC\Core\User\Controller', 'getDisplayNames');
 // Tags
 $this->create('core_tags_tags', '/tags/{type}')
 	->get()

core/user/controller.php

@@ -0,0 +1,31 @@
+<?php
+/**
+ * Copyright (c) 2014 Jörn Dreyer <jfd@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OC\Core\User;
+
+class Controller {
+	public static function getDisplayNames($args) {
+		\OC_JSON::checkLoggedIn();
+		\OC_JSON::callCheck();
+
+		$users = $_GET['users'];
+		$result = array();
+		$userManager = \OC::$server->getUserManager();
+
+		foreach ($users as $user) {
+			$userObject = $userManager->get($user);
+			if (is_object($userObject)) {
+				$result[$user] = $userObject->getDisplayName();
+			} else {
+				$result[$user] = false;
+			}
+		}
+
+		\OC_JSON::success(array('users'=>$result));
+	}
+}