Drupal 8 module that hides entities that has no translation in the currently viewed language. Also redirects untranslated node views to frontpage

hide_untranslated.php

<?php

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Url;


/**
 * Implements HOOK_entity_access
 * Hide entities in $check_types
 * if they don't match the current language.
 * If viewing an untranslated node,
 * redirect to front page in current language
 */
function hide_untranslated_entity_access(EntityInterface $entity, $operation, AccountInterface $account) {
  $type = $entity->getEntityTypeId();
  $check_types = ['node', 'inline_entity', 'paragraph'];

  if($operation != 'view' || !in_array($type, $check_types)) {
    return AccessResult::neutral();
  }

  $language = Drupal::languageManager()->getCurrentLanguage();
  if ($entity->language()->getId() == $language->getId()) {
    return AccessResult::neutral();
  }

  // If viewing a node that is not translated
  // to current language, redirect user to frontpage
  if ($type == 'node') {
    $node = Drupal::routeMatch()->getParameter('node');

    if (isset($node) && $node->id() == $entity->id()) {
      $url = Url::fromRoute('<front>', [], ['language' => $language]);
      $response = new RedirectResponse($url->toString());
      $response->send();
    }
  }

  return AccessResult::forbidden();
}