stanford_courses.module

<?php

/**
 * @file
 * Stanford_courses.module.
 */

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
use Drupal\Component\Utility\UrlHelper;
use Drupal\views\ViewExecutable;

/**
 * Implements hook_views_pre_render().
 */
function stanford_courses_views_pre_render(ViewExecutable $view) {
  if (isset($view) && ($view->storage->id() == 'stanford_courses')) {
    $view->element['#attached']['library'][] = 'stanford_courses/courses_page';
  }
}

/**
 * Implements hook_ENTITY_TYPE_view().
 */
function stanford_courses_node_view(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
  // Only run on stanford course items.
  if ($entity->bundle() !== "stanford_course" || !node_is_page($entity)) {
    return;
  }

  $rh_action = $entity->get('rh_action')->getString();
  $rh_redirect = $entity->get('rh_redirect')->getString();

  // Display a message to the user that this page would redirect to another
  // location for other users.
  if ($rh_action == "page_redirect" && !empty($rh_redirect)) {
    \Drupal::messenger()
      ->addWarning(t('This page will redirect to @url for other visitors.', ['@url' => $rh_redirect]));
  }

}

/**
 * Implements hook_ENTITY_TYPE_presave().
 */
function stanford_courses_node_presave(EntityInterface $entity) {
  if ($entity->bundle() != "stanford_course") {
    return;
  }
  $rabbit_hole = \Drupal::config('rabbit_hole.behavior_settings.node_type_' . $entity->bundle());
  $token_service = \Drupal::service('token');

  // When the su_course_link field is filled out on an item we want to set the
  // redirect options so it doesn't get indexed.
  if ($rabbit_hole) {
    /** @var \Drupal\Core\Utility\Token $token_service */
    $target = $token_service->replace("[node:su_course_link:uri]", ['node' => $entity]);

    // Check if the token that was provided is actually a url. If it is, then we
    // can set the rabbit hole action to redirect to that url.
    if (is_string($target) && UrlHelper::isValid($target, TRUE)) {
      $entity->set('rh_action', 'page_redirect');
      $entity->set('rh_redirect', $target);
      $entity->set('rh_redirect_response', 301);
    }
    else {
      $entity->set('rh_action', 'bundle_default');
      $entity->set('rh_redirect', '');
    }
  }

}