/**
 * Implements hook_node_access().
 */
function {{ machine_name }}_node_access(\Drupal\node\NodeInterface $node, $op, \Drupal\Core\Session\AccountInterface $account) {
  $type = $node->bundle();

  switch ($op) {
    case 'create':
      return AccessResult::allowedIfHasPermission($account, 'create ' . $type . ' content');

    case 'update':
      if ($account->hasPermission('edit any ' . $type . ' content', $account)) {
        return AccessResult::allowed()->cachePerPermissions();
      }
      else {
        return AccessResult::allowedIf($account->hasPermission('edit own ' . $type . ' content', $account) && ($account->id() == $node->getOwnerId()))->cachePerPermissions()->cachePerUser()->addCacheableDependency($node);
      }

    case 'delete':
      if ($account->hasPermission('delete any ' . $type . ' content', $account)) {
        return AccessResult::allowed()->cachePerPermissions();
      }
      else {
        return AccessResult::allowedIf($account->hasPermission('delete own ' . $type . ' content', $account) && ($account->id() == $node->getOwnerId()))->cachePerPermissions()->cachePerUser()->addCacheableDependency($node);
      }

    default:
      // No opinion.
      return AccessResult::neutral();
  }
}
