make it possible to change email and username

src/Controller/UserController.php

@@ -8,6 +8,7 @@ use SokoWeb\Interfaces\Response\IRedirect;
 use SokoWeb\OAuth\GoogleOAuth;
 use MapGuesser\PersistentData\Model\User;
 use MapGuesser\Repository\GuessRepository;
+use MapGuesser\Repository\UserRepository;
 use MapGuesser\Repository\UserConfirmationRepository;
 use MapGuesser\Repository\UserInChallengeRepository;
 use MapGuesser\Repository\UserPasswordResetterRepository;
@@ -19,6 +20,8 @@ use SokoWeb\Util\JwtParser;
 
 class UserController implements IAuthenticationRequired
 {
+    private UserRepository $userRepository;
+
     private UserConfirmationRepository $userConfirmationRepository;
 
     private UserPasswordResetterRepository $userPasswordResetterRepository;
@@ -31,6 +34,7 @@ class UserController implements IAuthenticationRequired
 
     public function __construct()
     {
+        $this->userRepository = new UserRepository();
         $this->userConfirmationRepository = new UserConfirmationRepository();
         $this->userPasswordResetterRepository = new UserPasswordResetterRepository();
         $this->userPlayedPlaceRepository = new UserPlayedPlaceRepository();
@@ -148,6 +152,32 @@ class UserController implements IAuthenticationRequired
             return new JsonContent(['error' => ['errorText' => $error]]);
         }
 
+        $newEmail = \Container::$request->post('email');
+        if ($newEmail !== $user->getEmail()) {
+            if (!filter_var($newEmail, FILTER_VALIDATE_EMAIL)) {
+                return new JsonContent(['error' => ['errorText' => 'The given email address is not valid.']]);
+            }
+
+            if ($this->userRepository->getByEmail($newEmail) !== null) {
+                return new JsonContent(['error' => ['errorText' => 'The given email address belongs to another account.']]);
+            }
+
+            $user->setEmail($newEmail);
+        }
+
+        $newUsername = \Container::$request->post('username');
+        if (strlen($newUsername) > 0 && $newUsername !== $user->getUsername()) {
+            if (preg_match('/^[a-zA-Z0-9_\-\.]+$/', $newUsername) !== 1) {
+                return new JsonContent(['error' => ['errorText' => 'Username can contain only english letters, digits, - (hyphen), . (dot), _ (underscore).']]);
+            }
+
+            if ($this->userRepository->getByUsername($newUsername) !== null) {
+                return new JsonContent(['error' => ['errorText' => 'The given username is already taken.']]);
+            }
+
+            $user->setUsername($newUsername);
+        }
+
         if (strlen(\Container::$request->post('password_new')) > 0) {
             if (strlen(\Container::$request->post('password_new')) < 6) {
                 return new JsonContent([