book_breadcrumb_test.module

<?php


/**
 * @file
 * Test module for testing the book module breadcrumb.
 */
use Drupal\Core\Access\AccessResultForbidden;
use Drupal\Core\Access\AccessResultNeutral;
use Drupal\Core\Session\AccountInterface;
use Drupal\node\NodeInterface;

/**
 * Implements hook_node_access().
 */
function book_breadcrumb_test_node_access(NodeInterface $node, $operation, AccountInterface $account) {
    $config = \Drupal::config('book_breadcrumb_test.settings');
    if ($config->get('hide') && $node->getTitle() == "you can't see me" && $operation == 'view') {
        $access = new AccessResultForbidden();
    }
    else {
        $access = new AccessResultNeutral();
    }
    $access->addCacheableDependency($config);
    $access->addCacheableDependency($node);
    return $access;
}