og-8.x-1.x-dev/src/Controller/OgAutocompleteController.php

<?php

declare(strict_types=1);

namespace Drupal\og\Controller;

use Drupal\Component\Utility\Crypt;
use Drupal\Component\Utility\Tags;
use Drupal\Core\Controller\ControllerBase;
use Drupal\Core\Entity\EntityAutocompleteMatcherInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\PrivateKey;
use Drupal\Core\Site\Settings;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;

/**
 * Defines a route controller for OG autocomplete form elements.
 */
class OgAutocompleteController extends ControllerBase {

  public function __construct(
    protected readonly EntityAutocompleteMatcherInterface $matcher,
    protected readonly PrivateKey $privateKey,
  ) {}

  /**
   * Autocomplete the label of an entity.
   *
   * @param \Symfony\Component\HttpFoundation\Request $request
   *   The request object that contains the typed tags.
   * @param \Drupal\Core\Entity\EntityInterface $group
   *   The group context for this autocomplete.
   * @param string $target_type
   *   The ID of the target entity type.
   * @param string $selection_handler
   *   The plugin ID of the entity reference selection handler.
   * @param string $selection_settings_key
   *   The hashed key of the key/value entry that holds the selection handler
   *   settings.
   *
   * @return \Symfony\Component\HttpFoundation\JsonResponse
   *   The matched entity labels as a JSON response.
   *
   * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
   *   Thrown if the selection settings key is not found in the key/value store
   *   or if it does not match the stored data.
   */
  public function handleAutocomplete(Request $request, EntityInterface $group, $target_type, $selection_handler, $selection_settings_key) {
    $matches = [];
    // Get the typed string from the URL, if it exists.
    if ($input = $request->query->get('q')) {
      $typed_string = Tags::explode($input);
      $typed_string = mb_strtolower(array_pop($typed_string));

      // Selection settings are passed in as a hashed key of a serialized array
      // stored in the key/value store.
      $selection_settings = $this->keyValue('entity_autocomplete')->get($selection_settings_key, FALSE);
      if ($selection_settings !== FALSE) {
        $data = serialize($selection_settings) . $target_type . $selection_handler;
        $selection_settings_hash = Crypt::hmacBase64($data, $this->privateKey->get() . Settings::getHashSalt());
        if ($selection_settings_hash !== $selection_settings_key) {
          // Disallow access when the selection settings hash does not match the
          // passed-in key.
          throw new AccessDeniedHttpException('Invalid selection settings key.');
        }
      }
      else {
        // Disallow access when the selection settings key is not found in the
        // key/value store.
        throw new AccessDeniedHttpException();
      }

      $selection_settings['group'] = $group;
      $matches = $this->matcher->getMatches($target_type, $selection_handler, $selection_settings, $typed_string);
    }

    return new JsonResponse($matches);
  }

}