fix the config option to remove the ability for users to set their displayname

lib/private/server.php

@@ -69,10 +69,18 @@ class Server extends SimpleContainer implements IServerContainer {
 			return new Root($manager, $view, $user);
 		});
 		$this->registerService('UserManager', function($c) {
-			return new \OC\User\Manager();
+			/**
+			 * @var SimpleContainer $c
+			 * @var \OC\AllConfig $config
+			 */
+			$config = $c->query('AllConfig');
+			return new \OC\User\Manager($config);
 		});
 		$this->registerService('UserSession', function($c) {
-			/** @var $c SimpleContainer */
+			/**
+			 * @var SimpleContainer $c
+			 * @var \OC\User\Manager $manager
+			 */
 			$manager = $c->query('UserManager');
 			$userSession = new \OC\User\Session($manager, \OC::$session);
 			$userSession->listen('\OC\User', 'preCreateUser', function ($uid, $password) {

lib/private/user/manager.php

@@ -35,7 +35,16 @@ class Manager extends PublicEmitter {
 	 */
 	private $cachedUsers = array();
 
-	public function __construct() {
+	/**
+	 * @var \OC\AllConfig $config
+	 */
+	private $config;
+
+	/**
+	 * @param \OC\AllConfig $config
+	 */
+	public function __construct($config = null) {
+		$this->config = $config;
 		$cachedUsers = $this->cachedUsers;
 		$this->listen('\OC\User', 'postDelete', function ($user) use (&$cachedUsers) {
 			$i = array_search($user, $cachedUsers);
@@ -103,7 +112,7 @@ class Manager extends PublicEmitter {
 		if (isset($this->cachedUsers[$uid])) {
 			return $this->cachedUsers[$uid];
 		}
-		$this->cachedUsers[$uid] = new User($uid, $backend, $this);
+		$this->cachedUsers[$uid] = new User($uid, $backend, $this, $this->config);
 		return $this->cachedUsers[$uid];
 	}
 

lib/private/user/user.php

@@ -42,12 +42,18 @@ class User {
 	 */
 	private $home;
 
+	/**
+	 * @var \OC\AllConfig $config
+	 */
+	private $config;
+
 	/**
 	 * @param string $uid
 	 * @param \OC_User_Backend $backend
-	 * @param Emitter $emitter
+	 * @param \OC\Hooks\Emitter $emitter
+	 * @param \OC\AllConfig $config
 	 */
-	public function __construct($uid, $backend, $emitter = null) {
+	public function __construct($uid, $backend, $emitter = null, $config = null) {
 		$this->uid = $uid;
 		if ($backend and $backend->implementsActions(OC_USER_BACKEND_GET_DISPLAYNAME)) {
 			$this->displayName = $backend->getDisplayName($uid);
@@ -58,6 +64,7 @@ class User {
 		$this->emitter = $emitter;
 		$enabled = \OC_Preferences::getValue($uid, 'core', 'enabled', 'true'); //TODO: DI for OC_Preferences
 		$this->enabled = ($enabled === 'true');
+		$this->config = $config;
 	}
 
 	/**
@@ -175,8 +182,12 @@ class User {
 	 * @return bool
 	 */
 	public function canChangeDisplayName() {
+		if ($this->config and $this->config->getSystemValue('allow_user_to_change_display_name') === false) {
+			return false;
+		} else {
 			return $this->backend->implementsActions(\OC_USER_BACKEND_SET_DISPLAYNAME);
 		}
+	}
 
 	/**
 	 * check if the user is enabled