Fix errors when enable_authenticator_manager is not set

src/Maker/MakeAuthenticator.php

@@ -43,6 +43,7 @@
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Exception\AuthenticationException;
 use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Security\Guard\AuthenticatorInterface as GuardAuthenticatorInterface;
 use Symfony\Component\Security\Http\Authentication\AuthenticationUtils;
 use Symfony\Component\Security\Http\Authenticator\AbstractAuthenticator;
 use Symfony\Component\Security\Http\Authenticator\AbstractLoginFormAuthenticator;
@@ -103,7 +104,8 @@ public function interact(InputInterface $input, ConsoleStyle $io, Command $comma
         $manipulator = new YamlSourceManipulator($this->fileManager->getFileContents($path));
         $securityData = $manipulator->getData();
 
-        if (!($securityData['security']['enable_authenticator_manager'] ?? false)) {
+        // @legacy - Can be removed when Symfony 5.4 support is dropped
+        if (interface_exists(GuardAuthenticatorInterface::class) && !($securityData['security']['enable_authenticator_manager'] ?? false)) {
             throw new RuntimeCommandException('MakerBundle only supports the new authenticator based security system. See https://symfony.com/doc/current/security.html');
         }
 

src/Maker/MakeRegistrationForm.php

@@ -49,6 +49,7 @@
 use Symfony\Component\Routing\Annotation\Route;
 use Symfony\Component\Routing\RouterInterface;
 use Symfony\Component\Security\Core\User\UserInterface;
+use Symfony\Component\Security\Guard\AuthenticatorInterface as GuardAuthenticatorInterface;
 use Symfony\Component\Security\Http\Authentication\UserAuthenticatorInterface;
 use Symfony\Component\Translation\Translator;
 use Symfony\Component\Validator\Validation;
@@ -124,7 +125,8 @@ public function interact(InputInterface $input, ConsoleStyle $io, Command $comma
         $providersData = $securityData['security']['providers'] ?? [];
 
         // Determine if we should use new security features introduced in Symfony 5.2
-        if ($securityData['security']['enable_authenticator_manager'] ?? false) {
+        // @legacy - Can be removed when Symfony 5.4 support is dropped
+        if (!interface_exists(GuardAuthenticatorInterface::class) || ($securityData['security']['enable_authenticator_manager'] ?? false)) {
             $this->useNewAuthenticatorSystem = true;
         }