prevent_homepage_deletion.module in Prevent homepage deletion 8

Code and functions for the Prevent homepage deletion module.

File

prevent_homepage_deletion.module

<?php

/**
 * @file
 * Code and functions for the Prevent homepage deletion module.
 */
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Url;
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function prevent_homepage_deletion_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {

    // Main module help for the prevent_homepage_deletion module.
    case 'help.page.prevent_homepage_deletion':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t("This module provides a new permission: delete\n        homepage node. Only users with this permission can delete the node that\n        is currently configured as the home page of the site. Other users will\n        not see the delete-tab, nor the delete option in the content overview.") . '</p>';
      return $output;
  }
}

/**
 * Implements hook_node_access().
 */
function prevent_homepage_deletion_node_access(EntityInterface $entity, $operation, AccountInterface $account) {
  if ($operation == 'delete') {
    if (!_prevent_homepage_deletion_check($entity, $account)) {
      return AccessResult::forbidden();
    }
    else {
      return AccessResult::neutral();
    }
  }
  return AccessResult::neutral();
}

/**
 * Helper function that checks if the current user can delete this node.
 *
 * @param \Drupal\Core\Entity\EntityInterface $entity
 * @param \Drupal\Core\Session\AccountInterface $account
 *
 * @return bool
 */
function _prevent_homepage_deletion_check(EntityInterface $entity, AccountInterface $account) {
  $candelete = TRUE;
  $entity_id = $entity
    ->id();
  $frontpage_id = 0;
  $config = \Drupal::config('system.site');
  $front_uri = $config
    ->get('page.front');
  $params = Url::fromUri("internal:" . $front_uri)
    ->getRouteParameters();
  if (!empty($params)) {
    $entity_type = key($params);
    $frontpage_id = $params[$entity_type];
  }
  if (\Drupal::service('path.matcher')
    ->isFrontPage() || $entity_id === $frontpage_id) {

    // Check for permission.
    if ($account
      ->hasPermission('delete_homepage_node')) {
      $candelete = TRUE;
    }
    else {
      $candelete = FALSE;
    }
  }
  return $candelete;
}

Functions

Name	Description
prevent_homepage_deletion_help	Implements hook_help().
prevent_homepage_deletion_node_access	Implements hook_node_access().
_prevent_homepage_deletion_check	Helper function that checks if the current user can delete this node.