Issue #3170810 by aimai, joaopauloscho: "Render #pre_render callbacks must be...

Issue #3170810 by aimai, joaopauloscho: "Render #pre_render callbacks must be methods of a class that implements \\Drupal\\Core\\Security\\TrustedCallbackInterface or be an anonymous function" PHP error after installation

redirect_node.module

@@ -9,6 +9,7 @@ use Drupal\Component\Utility\UrlHelper;
 use Drupal\Core\Block\BlockPluginInterface;
 use Drupal\Core\Url;
 use Drupal\node\Entity\Node;
+use Drupal\redirect_node\RedirectNodeRenderCallback;
 
 /**
  * Implements hook_block_view_BASE_BLOCK_ID_alter().
@@ -16,29 +17,9 @@ use Drupal\node\Entity\Node;
  * Add a prerender callback after all other callbacks to rewrite the displayed
  * url in menus blocks.
  *
- * @See _redirect_node_block_render_alter().
  */
 function redirect_node_block_view_system_menu_block_alter(array &$build, BlockPluginInterface $block) {
-  $build['#pre_render'][] = '_redirect_node_block_render_alter';
-}
-
-/**
- * Pre render callback callback to alter urls for redirect nodes in menus.
- *
- * Calls _redirect_node_replace_node_url_walk_array() recursively on all menu
- * items and their children. If the url for a menu item is rewritten, then a js
- * script is attached that will inject edit links on each of the menu items.
- *
- * @See _redirect_node_replace_node_url_walk_array().
- */
-function _redirect_node_block_render_alter(array $build) {
-  if (isset($build['content']['#items'])) {
-    $includeLibrary = _redirect_node_replace_node_url_walk_array($build['content']['#items']);
-    if ($includeLibrary) {
-      $build['#attached']['library'][] = 'redirect_node/redirect_node.edit_link';
-    }
-  }
-  return $build;
+  $build['#pre_render'][] = [RedirectNodeRenderCallback::class, 'preRender'];
 }
 
 /**

src/RedirectNodeRenderCallback.php

+<?php
+
+namespace Drupal\redirect_node;
+
+use Drupal\Core\Render\Element\RenderCallbackInterface;
+
+/**
+ * Implements a trusted preRender callback.
+ */
+class RedirectNodeRenderCallback implements RenderCallbackInterface {
+
+  /**
+   * Pre render callback callback to alter urls for redirect nodes in menus.
+   *
+   * @param array $build
+   *   The render array.
+   *
+   * @See \Drupal\redirect_node\RedirectNodeRenderCallback::preRender().
+   *
+   * @return array
+   *   The altered render array.
+   */
+  public static function preRender(array $build) {
+    // Calls _redirect_node_replace_node_url_walk_array() recursively on all menu
+    // items and their children. If the url for a menu item is rewritten, then a js
+    // script is attached that will inject edit links on each of the menu items.
+    if (isset($build['content']['#items'])) {
+      $includeLibrary = _redirect_node_replace_node_url_walk_array($build['content']['#items']);
+      if ($includeLibrary) {
+        $build['#attached']['library'][] = 'redirect_node/redirect_node.edit_link';
+      }
+    }
+    return $build;
+  }
+
+}