copyprevention.module in Copy Prevention 8

Main file for Copy Prevention module.

File

copyprevention.module

<?php

/**
 * @file
 * Main file for Copy Prevention module.
 */
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function copyprevention_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.copyprevention':
      $output = '<p>' . t('This module includes several different technical ways/methods to make
copying/stealing information/images from your site harder than it usually is
Disable text selection
Disable copy to clipboard
Disable right-click context menu on all site content
Disable right-click context menu only on images (<img> tag)
Place transparent image above all your images - this will protect your real
images from being saved using context menu or drag-and-drop to desktop.
Protect/hide your images from search engine indexes so that your images don\'t
show up in image searches - add "noimageindex" robots tag and disallow image
files indexing in robots.txt') . '</p>';
      return $output;
  }
}

/**
 * Implements hook_preprocess_html().
 */
function copyprevention_preprocess_html(&$vars) {
  if (!_copyprevention_is_enabled()) {
    return;
  }
  $body_settings = array_filter(\Drupal::configFactory()
    ->getEditable('copyprevention.settings')
    ->get('copyprevention_body'));
  foreach ($body_settings as $value) {
    $vars['attributes']['on' . $value] = 'return false';
  }
}

/**
 * Implements hook_page_attachments().
 */
function copyprevention_page_attachments(&$page) {
  global $base_url;
  $copyprevention_images_search = array_filter(\Drupal::configFactory()
    ->getEditable('copyprevention.settings')
    ->get('copyprevention_images_search'));
  if (array_key_exists('httpheader', $copyprevention_images_search)) {
    $page['#attached']['http_header'][] = [
      'X-Robots-Tag',
      'noimageindex',
      TRUE,
    ];
  }
  if (array_key_exists('pagehead', $copyprevention_images_search)) {
    $data = [
      '#tag' => 'meta',
      '#attributes' => [
        'name' => 'robots',
        'content' => 'noimageindex',
      ],
    ];
    $page['#attached']['html_head'][] = [
      $data,
      'copyprevention_images_search',
    ];
  }
  if (!_copyprevention_is_enabled()) {
    return;
  }
  $path = $base_url . '/' . drupal_get_path('module', 'copyprevention');
  $settings = [
    'body' => array_filter(\Drupal::configFactory()
      ->getEditable('copyprevention.settings')
      ->get('copyprevention_body')),
    'images' => array_filter(\Drupal::configFactory()
      ->getEditable('copyprevention.settings')
      ->get('copyprevention_images')),
    'images_min_dimension' => \Drupal::configFactory()
      ->getEditable('copyprevention.settings')
      ->get('copyprevention_images_min_dimension'),
    'transparentgif' => file_create_url($path . '/transparent.gif'),
  ];
  $page['#attached']['drupalSettings']['copyprevention'] = $settings;
  $page['#attached']['library'][] = 'copyprevention/copyprevention';
}

/**
 * Returns whether or not copyprevention should be enabled.
 *
 * @return bool
 */
function _copyprevention_is_enabled() {
  $enable =& drupal_static(__FUNCTION__);
  if (isset($enable)) {
    return $enable;
  }
  $enable = TRUE;
  if (\Drupal::currentUser()
    ->hasPermission('bypass copy prevention')) {
    $enable = FALSE;
  }
  else {
    $module_handler = \Drupal::moduleHandler();
    $module_handler
      ->alter('copyprevention_enable', $enable);
  }
  return $enable;
}

/**
 * Implements hook_robotstxt().
 */
function copyprevention_robotstxt() {
  $copyprevention_images_search = array_filter(\Drupal::configFactory()
    ->getEditable('copyprevention.settings')
    ->get('copyprevention_images_search'));
  if (array_key_exists('robotstxt', $copyprevention_images_search)) {
    return [
      '#Copy Prevention: protect/hide images from search engines indexing',
      'Disallow: *.jpg',
      'Disallow: *.JPG',
      'Disallow: *.jpeg',
      'Disallow: *.JPEG',
      'Disallow: *.png',
      'Disallow: *.PNG',
      'Disallow: *.gif',
      'Disallow: *.GIF',
    ];
  }
  return [];
}

Functions

Name	Description
copyprevention_help	Implements hook_help().
copyprevention_page_attachments	Implements hook_page_attachments().
copyprevention_preprocess_html	Implements hook_preprocess_html().
copyprevention_robotstxt	Implements hook_robotstxt().
_copyprevention_is_enabled	Returns whether or not copyprevention should be enabled.