fill email or username on failed-login-signup

src/Controller/LoginController.php

@@ -81,13 +81,11 @@ class LoginController
 
         if (\Container::$request->session()->has('tmp_user_data')) {
             $tmpUserData = \Container::$request->session()->get('tmp_user_data');
-
-            $data = ['email' => $tmpUserData['email']];
         } else {
-            $data = [];
+            $tmpUserData = [];
         }
 
-        return new HtmlContent('login/signup', $data);
+        return new HtmlContent('login/signup', $tmpUserData);
     }
 
     public function getSignupSuccess()
@@ -173,10 +171,14 @@ class LoginController
             $tmpUser = new User();
             $tmpUser->setPlainPassword(\Container::$request->post('password'));
 
-            \Container::$request->session()->set('tmp_user_data', [
-                'email' => \Container::$request->post('email'),
-                'password_hashed' => $tmpUser->getPassword()
-            ]);
+            $tmpUserData = ['password_hashed' => $tmpUser->getPassword()];
+            if (filter_var(\Container::$request->post('email'), FILTER_VALIDATE_EMAIL) === false) {
+                $tmpUserData['username'] = \Container::$request->post('email');
+            } else {
+                $tmpUserData['email'] = \Container::$request->post('email');
+            }
+
+            \Container::$request->session()->set('tmp_user_data', $tmpUserData);
 
             return new JsonContent([
                 'redirect' => [