[Security] Deprecate simple_preauth and simple_form in favor of Guard

Author: Robin Chalas

Authentication/Provider/SimpleAuthenticationProvider.php

@@ -19,8 +19,12 @@
 use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 
+@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.2, use Guard instead.', SimpleAuthenticationProvider::class), E_USER_DEPRECATED);
+
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * @deprecated since Symfony 4.2, use Guard instead.
  */
 class SimpleAuthenticationProvider implements AuthenticationProviderInterface
 {

Authentication/SimpleAuthenticatorInterface.php

@@ -16,6 +16,8 @@
 
 /**
  * @author Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * @deprecated since Symfony 4.2, use Guard instead.
  */
 interface SimpleAuthenticatorInterface
 {

Tests/Authentication/Provider/SimpleAuthenticationProviderTest.php

@@ -17,6 +17,9 @@
 use Symfony\Component\Security\Core\Exception\LockedException;
 use Symfony\Component\Security\Core\User\UserChecker;
 
+/**
+ * @group legacy
+ */
 class SimpleAuthenticationProviderTest extends TestCase
 {
     /**