minor #37207 [Ssi] Move configuration to PHP (50bhan)

This PR was squashed before being merged into the 5.2-dev branch.

Discussion
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[Ssi] Move configuration to PHP

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | Ref #37186
| License       | MIT
| Doc PR        | n/a

Commits
-------

5a4d667369 [Ssi] Move configuration to PHP

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -366,7 +366,7 @@ public function load(array $configs, ContainerBuilder $container)
         $propertyInfoEnabled = $this->isConfigEnabled($container, $config['property_info']);
         $this->registerValidationConfiguration($config['validation'], $container, $loader, $propertyInfoEnabled);
         $this->registerEsiConfiguration($config['esi'], $container, $loader);
-        $this->registerSsiConfiguration($config['ssi'], $container, $loader);
+        $this->registerSsiConfiguration($config['ssi'], $container, $phpLoader);
         $this->registerFragmentsConfiguration($config['fragments'], $container, $loader);
         $this->registerTranslatorConfiguration($config['translator'], $container, $loader, $config['default_locale']);
         $this->registerProfilerConfiguration($config['profiler'], $container, $loader);
@@ -543,15 +543,15 @@ private function registerEsiConfiguration(array $config, ContainerBuilder $conta
         $loader->load('esi.xml');
     }
 
-    private function registerSsiConfiguration(array $config, ContainerBuilder $container, XmlFileLoader $loader)
+    private function registerSsiConfiguration(array $config, ContainerBuilder $container, PhpFileLoader $loader)
     {
         if (!$this->isConfigEnabled($container, $config)) {
             $container->removeDefinition('fragment.renderer.ssi');
 
             return;
         }
 
-        $loader->load('ssi.xml');
+        $loader->load('ssi.php');
     }
 
     private function registerFragmentsConfiguration(array $config, ContainerBuilder $container, XmlFileLoader $loader)

Resources/config/ssi.php

@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Loader\Configurator;
+
+use Symfony\Component\HttpKernel\EventListener\SurrogateListener;
+use Symfony\Component\HttpKernel\HttpCache\Ssi;
+
+return static function (ContainerConfigurator $container) {
+    $container->services()
+        ->set('ssi', Ssi::class)
+
+        ->set('ssi_listener', SurrogateListener::class)
+            ->args([service('ssi')->ignoreOnInvalid()])
+            ->tag('kernel.event_subscriber')
+    ;
+};