show correct error message if google login fails

src/Controller/LoginController.php

@@ -121,6 +121,7 @@ class LoginController
         if ($redirectUrl === null) {
             $redirectUrl = \Container::$routeCollection->getRoute('index')->generateLink();
         }
+        $defaultError = 'Authentication with Google failed. Please <a href="/login/google" title="Login with Google">try again</a>!';
 
         if ($this->request->user() !== null) {
             $this->request->session()->delete('redirect_after_login');
@@ -128,7 +129,7 @@ class LoginController
         }
 
         if ($this->request->query('state') !== $this->request->session()->get('oauth_state')) {
-            return new HtmlContent('login/google_login');
+            return new HtmlContent('login/google_login_error', ['error' => $defaultError]);
         }
 
         $oAuth = new GoogleOAuth(new Request());
@@ -138,27 +139,23 @@ class LoginController
         );
 
         if (!isset($tokenData['id_token'])) {
-            return new HtmlContent('login/google_login');
+            return new HtmlContent('login/google_login_error', ['error' => $defaultError]);
         }
 
         $jwtParser = new JwtParser($tokenData['id_token']);
         $idToken = $jwtParser->getPayload();
 
         if ($idToken['nonce'] !== $this->request->session()->get('oauth_nonce')) {
-            return new HtmlContent('login/google_login');
+            return new HtmlContent('login/google_login_error', ['error' => $defaultError]);
         }
 
         if (!$idToken['email_verified']) {
-            return new HtmlContent('login/google_login');
+            return new HtmlContent('login/google_login_error', ['error' => $defaultError]);
         }
 
         $user = $this->userRepository->getByGoogleSub($idToken['sub']);
         if ($user === null) {
-            return new JsonContent([
-                'error' => [
-                    'errorText' => 'No user found for this Google account.'
-                ]
-            ]);
+            return new HtmlContent('login/google_login_error', ['error' => 'No user found for this Google account.']);
         }
 
         $this->request->setUser($user);