Add rector rules for cakephp/authentication 4.x upgrade

Adds rules to automate the 3.x to 4.x migration for the authentication plugin:

- Rename CakeRouterUrlChecker to DefaultUrlChecker
- Rename DefaultUrlChecker (framework-agnostic) to GenericUrlChecker
- Rename Plugin to AuthenticationPlugin
- Remove loadIdentifier() method calls

See: cakephp/authentication#748

Author: dereuromark

config/rector/authentication40.php

@@ -0,0 +1,9 @@
+<?php
+declare(strict_types=1);
+
+use Cake\Upgrade\Rector\Set\CakePHPSetList;
+use Rector\Config\RectorConfig;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->sets([CakePHPSetList::AUTHENTICATION_40]);
+};

config/rector/sets/authentication40.php

@@ -0,0 +1,30 @@
+<?php
+declare(strict_types=1);
+
+use Cake\Upgrade\Rector\Rector\MethodCall\RemoveMethodCallRector;
+use Cake\Upgrade\Rector\ValueObject\RemoveMethodCall;
+use Rector\Config\RectorConfig;
+use Rector\Renaming\Rector\Name\RenameClassRector;
+
+/**
+ * @see https://github.com/cakephp/authentication/blob/4.x/docs/en/upgrade-3-to-4.rst
+ */
+return static function (RectorConfig $rectorConfig): void {
+    // URL checker class renames
+    // Note: Order matters - GenericUrlChecker rename must come first to avoid
+    // CakeRouterUrlChecker -> DefaultUrlChecker -> GenericUrlChecker chain
+    $rectorConfig->ruleWithConfiguration(RenameClassRector::class, [
+        // Old framework-agnostic DefaultUrlChecker renamed to GenericUrlChecker
+        'Authentication\UrlChecker\DefaultUrlChecker' => 'Authentication\UrlChecker\GenericUrlChecker',
+        // CakeRouterUrlChecker renamed to DefaultUrlChecker
+        'Authentication\UrlChecker\CakeRouterUrlChecker' => 'Authentication\UrlChecker\DefaultUrlChecker',
+        // Plugin class renamed
+        'Authentication\Plugin' => 'Authentication\AuthenticationPlugin',
+    ]);
+
+    // Remove loadIdentifier() method calls from AuthenticationService
+    $rectorConfig->ruleWithConfiguration(RemoveMethodCallRector::class, [
+        new RemoveMethodCall('Authentication\AuthenticationService', 'loadIdentifier'),
+        new RemoveMethodCall('Authentication\AuthenticationServiceInterface', 'loadIdentifier'),
+    ]);
+};

src/Rector/Set/CakePHPSetList.php

@@ -104,4 +104,9 @@ final class CakePHPSetList
      * @var string
      */
     public const CAKEPHP_FLUENT_OPTIONS = __DIR__ . '/../../../config/rector/sets/cakephp-fluent-options.php';
+
+    /**
+     * @var string
+     */
+    public const AUTHENTICATION_40 = __DIR__ . '/../../../config/rector/sets/authentication40.php';
 }