Resolve #5092 "Verloren gegangene Änderungen ais Login/Logout"

Closes #5092

Merge request studip/studip!3807

app/controllers/login.php

@@ -49,7 +49,7 @@ class LoginController extends AuthenticatedController
 
 
             foreach (array_keys($GLOBALS['INSTALLED_LANGUAGES']) as $language_key) {
-                if (Request::submitted('set_language_' . $language_key)) {
+                if (Request::get('set_language') === $language_key) {
                     $_SESSION['forced_language'] = $language_key;
                     $_SESSION['_language'] = $language_key;
                     init_i18n($_SESSION['_language']);
@@ -60,7 +60,8 @@ class LoginController extends AuthenticatedController
             }
 
         }
-        if (Request::isPost()) {
+
+        if (Request::submitted('Login')) {
             CSRFProtection::verifyUnsafeRequest();
 
             $check_auth = StudipAuthAbstract::CheckAuthentication(

app/controllers/logout.php

@@ -18,15 +18,25 @@ class LogoutController extends AuthenticatedController
 
     public function index_action()
     {
+        if (
+            !Request::isPost()
+            && !(
+                isset($_SESSION['logout_ticket'])
+                && check_ticket($_SESSION['logout_ticket'])
+            )
+        ) {
+            $this->redirect(URLHelper::getURL('dispatch.php/start'));
+            return;
+        }
+
         if ($GLOBALS['user']->id !== 'nobody') {
             $my_messaging_settings = $GLOBALS['user']->cfg->MESSAGING_SETTINGS;
 
             //Wenn Option dafuer gewaehlt, alle ungelsesenen Nachrichten als gelesen speichern
-            if ($my_messaging_settings["logout_markreaded"]) {
+            if (!empty($my_messaging_settings['logout_markreaded'])) {
                 Message::markAllAs();
             }
 
-            $logout_user = $GLOBALS['user']->id;
             $_language = $_SESSION['_language'];
             $contrast = UserConfig::get($GLOBALS['user']->id)->USER_HIGH_CONTRAST;