Translate failure messages of json authentication

src/Symfony/Bundle/SecurityBundle/Resources/config/security_authenticator.php

@@ -143,6 +143,7 @@ return static function (ContainerConfigurator $container) {
                 abstract_arg('options'),
                 service('property_accessor')->nullOnInvalid(),
             ])
+            ->call('setTranslator', [service('translator')->ignoreOnInvalid()])
 
         ->set('security.authenticator.remember_me', RememberMeAuthenticator::class)
             ->abstract()

src/Symfony/Bundle/SecurityBundle/Resources/config/security_listeners.php

@@ -189,6 +189,7 @@ return static function (ContainerConfigurator $container) {
                 service('event_dispatcher')->nullOnInvalid(),
                 service('property_accessor')->nullOnInvalid(),
             ])
+            ->call('setTranslator', [service('translator')->ignoreOnInvalid()])
             ->tag('monolog.logger', ['channel' => 'security'])
 
         ->set('security.authentication.listener.remote_user', RemoteUserAuthenticationListener::class)

src/Symfony/Component/Security/CHANGELOG.md

@@ -10,6 +10,7 @@ CHANGELOG
  * Added `Passport` to `LoginFailureEvent`.
  * Deprecated `setProviderKey()`/`getProviderKey()` in favor of `setFirewallName()/getFirewallName()` in `PreAuthenticatedToken`, `RememberMeToken`, `SwitchUserToken`, `UsernamePasswordToken`, `DefaultAuthenticationSuccessHandler`; and deprecated the `AbstractRememberMeServices::$providerKey` property in favor of `AbstractRememberMeServices::$firewallName`
  * Added `FirewallListenerInterface` to make the execution order of firewall listeners configurable
+ * Added translator to `\Symfony\Component\Security\Http\Authenticator\JsonLoginAuthenticator` and `\Symfony\Component\Security\Http\Firewall\UsernamePasswordJsonAuthenticationListener` to translate authentication failure messages
 
 5.1.0
 -----

src/Symfony/Component/Security/Http/Authenticator/JsonLoginAuthenticator.php

@@ -35,6 +35,7 @@ use Symfony\Component\Security\Http\Authenticator\Passport\Credentials\PasswordC
 use Symfony\Component\Security\Http\Authenticator\Passport\Passport;
 use Symfony\Component\Security\Http\Authenticator\Passport\PassportInterface;
 use Symfony\Component\Security\Http\HttpUtils;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * Provides a stateless implementation of an authentication via
@@ -55,6 +56,11 @@ class JsonLoginAuthenticator implements InteractiveAuthenticatorInterface
     private $successHandler;
     private $failureHandler;
 
+    /**
+     * @var TranslatorInterface|null
+     */
+    private $translator;
+
     public function __construct(HttpUtils $httpUtils, UserProviderInterface $userProvider, ?AuthenticationSuccessHandlerInterface $successHandler = null, ?AuthenticationFailureHandlerInterface $failureHandler = null, array $options = [], ?PropertyAccessorInterface $propertyAccessor = null)
     {
         $this->options = array_merge(['username_path' => 'username', 'password_path' => 'password'], $options);
@@ -120,7 +126,13 @@ class JsonLoginAuthenticator implements InteractiveAuthenticatorInterface
     public function onAuthenticationFailure(Request $request, AuthenticationException $exception): ?Response
     {
         if (null === $this->failureHandler) {
-            return new JsonResponse(['error' => $exception->getMessageKey()], JsonResponse::HTTP_UNAUTHORIZED);
+            $errorMessage = $exception->getMessageKey();
+
+            if (null !== $this->translator) {
+                $errorMessage = $this->translator->trans($exception->getMessageKey(), $exception->getMessageData(), 'security');
+            }
+
+            return new JsonResponse(['error' => $errorMessage], JsonResponse::HTTP_UNAUTHORIZED);
         }
 
         return $this->failureHandler->onAuthenticationFailure($request, $exception);
@@ -131,6 +143,11 @@ class JsonLoginAuthenticator implements InteractiveAuthenticatorInterface
         return true;
     }
 
+    public function setTranslator(TranslatorInterface $translator)
+    {
+        $this->translator = $translator;
+    }
+
     private function getCredentials(Request $request)
     {
         $data = json_decode($request->getContent());

src/Symfony/Component/Security/Http/Firewall/UsernamePasswordJsonAuthenticationListener.php

@@ -34,6 +34,7 @@ use Symfony\Component\Security\Http\HttpUtils;
 use Symfony\Component\Security\Http\SecurityEvents;
 use Symfony\Component\Security\Http\Session\SessionAuthenticationStrategyInterface;
 use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 /**
  * UsernamePasswordJsonAuthenticationListener is a stateless implementation of
@@ -57,6 +58,11 @@ class UsernamePasswordJsonAuthenticationListener extends AbstractListener
     private $propertyAccessor;
     private $sessionStrategy;
 
+    /**
+     * @var TranslatorInterface|null
+     */
+    private $translator;
+
     public function __construct(TokenStorageInterface $tokenStorage, AuthenticationManagerInterface $authenticationManager, HttpUtils $httpUtils, string $providerKey, AuthenticationSuccessHandlerInterface $successHandler = null, AuthenticationFailureHandlerInterface $failureHandler = null, array $options = [], LoggerInterface $logger = null, EventDispatcherInterface $eventDispatcher = null, PropertyAccessorInterface $propertyAccessor = null)
     {
         $this->tokenStorage = $tokenStorage;
@@ -182,7 +188,13 @@ class UsernamePasswordJsonAuthenticationListener extends AbstractListener
         }
 
         if (!$this->failureHandler) {
-            return new JsonResponse(['error' => $failed->getMessageKey()], 401);
+            $errorMessage = $failed->getMessageKey();
+
+            if (null !== $this->translator) {
+                $errorMessage = $this->translator->trans($failed->getMessageKey(), $failed->getMessageData(), 'security');
+            }
+
+            return new JsonResponse(['error' => $errorMessage], 401);
         }
 
         $response = $this->failureHandler->onAuthenticationFailure($request, $failed);
@@ -204,6 +216,11 @@ class UsernamePasswordJsonAuthenticationListener extends AbstractListener
         $this->sessionStrategy = $sessionStrategy;
     }
 
+    public function setTranslator(TranslatorInterface $translator)
+    {
+        $this->translator = $translator;
+    }
+
     private function migrateSession(Request $request, TokenInterface $token)
     {
         if (!$this->sessionStrategy || !$request->hasSession() || !$request->hasPreviousSession()) {