linkback.module

<?php

/**
 * @file
 * Contains linkback.module..
 */

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Queue\QueueFactory;
use Drupal\Core\Queue\QueueInterface;
use Symfony\Component\DomCrawler\Crawler;

use Drupal\Core\Routing\RouteMatchInterface;

// User-agent used when extracting titles and excerpts.
define('LINKBACK_UA', 'Drupal Linkback (+http://drupal.org/project/linkback)');

// The local node could not be found.
define('LINKBACK_ERROR_LOCAL_NODE_NOT_FOUND', 1);

// The local node could not be used as a linkback resource (e.g., linkbacks are
// disabled on the node).
define('LINKBACK_ERROR_LOCAL_NODE_REFBACK_NOT_ALLOWED', 2);

// The linkback has previously been registered.
define('LINKBACK_ERROR_REFBACK_ALREADY_REGISTERED', 3);

// The linkback source does not contain the link to target.
define('LINKBACK_ERROR_REMOTE_URL_MISSING_LINK', 4);

/**
 * Implements hook_help().
 * @param string $route_name
 */
function linkback_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the linkback module.
    case 'help.page.linkback':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('linkback raw functionality') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_ENTITY_TYPE_insert().
 */
function linkback_entity_insert(EntityInterface $entity) {

  // TODO allow other entities to use linkbacks.
  if ($entity->getEntityTypeId() != 'node') {
    return;
  }

  if (!(bool) $entity->get('status')) {
    return;
  }
  /** @var QueueFactory $queue_factory */
  $queue_factory = \Drupal::service('queue');
  /** @var QueueInterface $queue */
  $queue = $queue_factory->get(\Drupal::config('linkback.settings')->get('use_cron') ? 'cron_linkback_sender' : 'manual_linkback_sender');
  $item = new \stdClass();
  $item->nid = $entity->id();
  $queue->createItem($entity);

}

/**
 * Implements hook_ENTITY_TYPE_update().
 */
function linkback_entity_update(EntityInterface $entity) {
  linkback_entity_insert($entity);
}