Fixes #3678 Add Generator Metatag (#3680)

modules/custom/az_core/az_core.module

@@ -372,6 +372,26 @@ function _az_core_check_attribute_form(array &$form, FormStateInterface $form_st
   }
 }
 
+/**
+ * Implements hook_page_attachments_alter().
+ *
+ * Override Drupal core generator metatag for distribution.
+ */
+function az_core_page_attachments_alter(array &$page) {
+  // Verify we're not trying to add tag to some page that should not have it.
+  if (!empty($page['#attached']['html_head'])) {
+    foreach ($page['#attached']['html_head'] as &$head_item) {
+      // Check if the current item is the meta generator.
+      if (is_array($head_item) && in_array('system_meta_generator', $head_item, TRUE)) {
+        // Update the tag if it's present.
+        if (!empty($head_item[0]['#attributes']['content'])) {
+          $head_item[0]['#attributes']['content'] = 'Arizona Quickstart (https://quickstart.arizona.edu)';
+        }
+      }
+    }
+  }
+}
+
 /**
  * Form validation that fails validation on protected term pages.
  *

modules/custom/az_core/az_core.services.yml

@@ -7,6 +7,10 @@ services:
       - '@current_route_match'
     tags:
       - { name: page_cache_response_policy }
+  az_core_generator:
+    public: false
+    class: Drupal\az_core\EventSubscriber\AZGeneratorSubscriber
+    decorates: response_generator_subscriber
   logger.channel.az_core:
     parent: logger.channel_base
     arguments:

modules/custom/az_core/src/EventSubscriber/AZGeneratorSubscriber.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\az_core\EventSubscriber;
+
+use Drupal\Core\EventSubscriber\ResponseGeneratorSubscriber;
+use Symfony\Component\HttpKernel\Event\ResponseEvent;
+
+/**
+ * Subscriber to add distribution X-Generator header tag.
+ */
+class AZGeneratorSubscriber extends ResponseGeneratorSubscriber {
+
+  /**
+   * Sets replacement X-Generator header on successful responses.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\ResponseEvent $event
+   *   The event to process.
+   */
+  public function onRespond(ResponseEvent $event) {
+    if (!$event->isMainRequest()) {
+      return;
+    }
+
+    $response = $event->getResponse();
+
+    $response->headers->set('X-Generator', 'Arizona Quickstart (https://quickstart.arizona.edu)');
+  }
+
+}