diff --git a/apps/files_external/js/settings.js b/apps/files_external/js/settings.js
index 27ed0254dd..6c287d6a76 100644
--- a/apps/files_external/js/settings.js
+++ b/apps/files_external/js/settings.js
@@ -233,10 +233,17 @@ $(document).ready(function() {
 					}
 				},
 				initSelection: function(element, callback) {
+					var users = {};
+					users['users'] = [];
+					var toSplit = element.val().split(",");
+					for (var i = 0; i < toSplit.length; i++) {
+						users['users'].push(toSplit[i]);
+					}
+
 					$.ajax(OC.generateUrl('displaynames'), {
-						data: {
-							users: element.val().split(",")
-						},
+						type: 'POST',
+						contentType: 'application/json',
+						data: JSON.stringify(users),
 						dataType: "json"
 					}).done(function(data) {
 						var results = [];
diff --git a/core/lostpassword/application.php b/core/application.php
similarity index 78%
rename from core/lostpassword/application.php
rename to core/application.php
index ba2f3fc633..3380184775 100644
--- a/core/lostpassword/application.php
+++ b/core/application.php
@@ -8,10 +8,11 @@
  * See the COPYING-README file.
  */
 
-namespace OC\Core\LostPassword;
+namespace OC\Core;
 
 use \OCP\AppFramework\App;
 use OC\Core\LostPassword\Controller\LostController;
+use OC\Core\User\UserController;
 
 class Application extends App {
 
@@ -38,6 +39,14 @@ class Application extends App {
 				\OC_App::isEnabled('files_encryption')
 			);
 		});
+		$container->registerService('UserController', function($c) {
+			return new UserController(
+				$c->query('AppName'),
+				$c->query('Request'),
+				$c->query('ServerContainer')->getUserManager(),
+				new \OC_Defaults()
+			);
+		});
 	}
 
 
diff --git a/core/routes.php b/core/routes.php
index 37eb2f8a56..28a3680dd9 100644
--- a/core/routes.php
+++ b/core/routes.php
@@ -6,13 +6,14 @@
  * See the COPYING-README file.
  */
 
-use OC\Core\LostPassword\Application;
+use OC\Core\Application;
 
 $application = new Application();
 $application->registerRoutes($this, array('routes' => array(
 		array('name' => 'lost#email', 'url' => '/lostpassword/email', 'verb' => 'POST'),
 		array('name' => 'lost#resetform', 'url' => '/lostpassword/reset/form/{token}/{userId}', 'verb' => 'GET'),
 		array('name' => 'lost#setPassword', 'url' => '/lostpassword/set/{token}/{userId}', 'verb' => 'POST'),
+		array('name' => 'user#getDisplayNames', 'url' => '/displaynames', 'verb' => 'POST'),
 	)
 ));
 
@@ -35,10 +36,6 @@ $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
 $this->create('core_tags_tags', '/tags/{type}')
 	->get()
diff --git a/core/user/controller.php b/core/user/controller.php
deleted file mode 100644
index cbcbd93618..0000000000
--- a/core/user/controller.php
+++ /dev/null
@@ -1,31 +0,0 @@
-<?php
-/**
- * Copyright (c) 2014 Jörn Dreyer <jfd@owncloud.com>
- * This file is licensed under the Affero General Public License version 3 or
- * later.
- * See the COPYING-README file.
- */
-
-namespace OC\Core\User;
-
-class Controller {
-	public static function getDisplayNames($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));
-	}
-}
diff --git a/core/user/usercontroller.php b/core/user/usercontroller.php
new file mode 100644
index 0000000000..2570e3b5b0
--- /dev/null
+++ b/core/user/usercontroller.php
@@ -0,0 +1,66 @@
+<?php
+/**
+ * Copyright (c) 2014 Jörn Dreyer <jfd@owncloud.com>
+ * Copyright (c) 2014 Lukas Reschke <lukas@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;
+
+use \OCP\AppFramework\Controller;
+use \OCP\AppFramework\Http\JSONResponse;
+use \OCP\IRequest;
+
+class UserController extends Controller {
+	/**
+	 * @var \OCP\IUserManager
+	 */
+	protected $userManager;
+
+	/**
+	 * @var \OC_Defaults
+	 */
+	protected $defaults;
+
+	public function __construct($appName,
+								IRequest $request,
+								$userManager,
+								$defaults
+	) {
+		parent::__construct($appName, $request);
+		$this->userManager = $userManager;
+		$this->defaults = $defaults;
+	}
+
+	/**
+	 * Lookup user display names
+	 *
+	 * @NoAdminRequired
+	 *
+	 * @param array $users
+	 *
+	 * @return JSONResponse
+	 */
+	public function getDisplayNames($users) {
+		$result = array();
+
+		foreach ($users as $user) {
+			$userObject = $this->userManager->get($user);
+			if (is_object($userObject)) {
+				$result[$user] = $userObject->getDisplayName();
+			} else {
+				$result[$user] = $user;
+			}
+		}
+
+		$json = array(
+			'users' => $result,
+			'status' => 'success'
+		);
+
+		return new JSONResponse($json);
+
+	}
+}