<?php

/**
 * CKEditor - The text editor for the Internet - http://ckeditor.com
 * Copyright (c) 2003-2013, CKSource - Frederico Knabben. All rights reserved.
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses of your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * @file
 * CKEditor Module for Drupal 7.x
 *
 * This module allows Drupal to replace textarea fields with CKEditor.
 *
 * CKEditor is an online rich text editor that can be embedded inside web pages.
 * It is a WYSIWYG (What You See Is What You Get) editor which means that the
 * text edited in it looks as similar as possible to the results end users will
 * see after the document gets published. It brings to the Web popular editing
 * features found in desktop word processors such as Microsoft Word and
 * OpenOffice.org Writer. CKEditor is truly lightweight and does not require any
 * kind of installation on the client computer.
 */
/**
 * The name of the simplified toolbar that should be forced.
 * Make sure that this toolbar is defined in ckeditor.config.js or fckconfig.js.
 */
define('CKEDITOR_FORCE_SIMPLE_TOOLBAR_NAME', 'DrupalBasic');
define('CKEDITOR_ENTERMODE_P', 1);
define('CKEDITOR_ENTERMODE_BR', 2);
define('CKEDITOR_ENTERMODE_DIV', 3);
define('CKEDITOR_LATEST', '4.5.4');

global $_ckeditor_configuration;
global $_ckeditor_ids;

module_load_include('inc', 'ckeditor', 'includes/ckeditor.user');

$_ckeditor_configuration = array();
$_ckeditor_ids = array();

/**
 * Implements hook_hook_info().
 */
function ckeditor_hook_info() {
  $hooks = array(
    'ckeditor_plugin',
    'ckeditor_plugin_alter',
    'ckeditor_security_filter',
    'ckeditor_security_filter_alter',
    'ckeditor_settings_alter',
  );

  return array_fill_keys($hooks, array('group' => 'ckeditor'));
}

/**
 * Implementation of hook_menu().
 */
function ckeditor_menu() {
  $items = array();

  $items['ckeditor/xss'] = array(
    'title' => 'XSS Filter',
    'description' => 'XSS Filter.',
    'page callback' => 'ckeditor_filter_xss',
    'file' => 'includes/ckeditor.page.inc',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  $items['ckeditor/disable/wysiwyg/%'] = array(
    'title' => 'Disable the WYSIWYG module',
    'description' => 'Disable WYSIWYG module.',
    'page callback' => 'ckeditor_disable_wysiwyg',
    'page arguments' => array(3),
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  $items['admin/config/content/ckeditor'] = array(
    'title' => 'CKEditor',
    'description' => 'Configure the rich text editor.',
    'page callback' => 'ckeditor_admin_main',
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_NORMAL_ITEM,
  );

  $items['admin/config/content/ckeditor/skinframe'] = array(
    'title' => 'Change skin of CKEditor',
    'description' => 'Configure skin for CKEditor.',
    'page callback' => 'ckeditor_skinframe',
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_CALLBACK,
  );

  $items['admin/config/content/ckeditor/add'] = array(
    'title' => 'Add a new CKEditor profile',
    'description' => 'Configure the rich text editor.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ckeditor_admin_profile_form', 'add'),
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_CALLBACK,
  );

  $items['admin/config/content/ckeditor/clone/%ckeditor_profile'] = array(
    'title' => 'Clone the CKEditor profile',
    'description' => 'Configure the rich text editor.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ckeditor_admin_profile_clone_form', 'clone', 5),
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_CALLBACK,
  );

  $items['admin/config/content/ckeditor/edit/%ckeditor_profile'] = array(
    'title' => 'Edit the CKEditor profile',
    'description' => 'Configure the rich text editor.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ckeditor_admin_profile_form', 'edit', 5),
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_CALLBACK,
  );

  $items['admin/config/content/ckeditor/delete/%ckeditor_profile'] = array(
    'title' => 'Delete the CKEditor profile',
    'description' => 'Configure the rich text editor.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ckeditor_admin_profile_delete_form', 5),
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_CALLBACK,
  );

  $items['admin/config/content/ckeditor/addg'] = array(
    'title' => 'Add the CKEditor Global profile',
    'description' => 'Configure the rich text editor.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ckeditor_admin_global_profile_form', 'add'),
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_CALLBACK,
  );

  $items['admin/config/content/ckeditor/editg'] = array(
    'title' => 'Edit the CKEditor Global profile',
    'description' => 'Configure the rich text editor.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('ckeditor_admin_global_profile_form', 'edit'),
    'file' => 'includes/ckeditor.admin.inc',
    'access arguments' => array('administer ckeditor'),
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Implementation of hook_permission().
 *
 * People -> Permissions
 */
function ckeditor_permission() {
  $arr = array();
  $arr['administer ckeditor'] = array(
    'title' => t('Administer CKEditor access'),
    'description' => t('Allow users to change CKEditor settings.')
  );

  $arr['customize ckeditor'] = array(
    'title' => t('Customize CKEditor appearance'),
    'description' => t('Allow users to customize CKEditor appearance.')
  );

  if (file_exists(ckfinder_path('local'))) {
    $arr['allow CKFinder file uploads'] = array(
      'title' => t('CKFinder access'),
      'description' => t('Allow users to use CKFinder.')
    );
  }
  return $arr;
}

/**
 * Implementation of hook_help().
 *
 * This function delegates the execution to ckeditor_help_delegate() in includes/ckeditor.page.inc to
 * lower the amount of code in ckeditor.module.
 */
function ckeditor_help($path, $arg) {
  module_load_include('inc', 'ckeditor', 'includes/ckeditor.page');
  return module_invoke('ckeditor', 'help_delegate', $path, $arg);
}

/**
 * Check CKEditor version
 */
function ckeditor_get_version($main_version = FALSE) {
  static $ckeditor_version = FALSE;

  if ($ckeditor_version !== FALSE) {
    if (!$main_version) {
      return $ckeditor_version;
    }
    $version = explode('.', $ckeditor_version);
    return trim($version[0]);
  }

  $editor_path = ckeditor_path('local', TRUE);
  if ($editor_path == '<URL>') {
    $url = ckeditor_path('url', TRUE);
    $matches = array();
    if (preg_match("|cdn.ckeditor.com/(\d(\.\d+)+.*)/|i", $url, $matches)) {
      $ckeditor_version = $matches[1];
      return $matches[1];
    }
    return $ckeditor_version = NULL;
  }

  $jspath = $editor_path . '/ckeditor.js';

  $configcontents = @file_get_contents($jspath);
  if (!$configcontents) {
    return $ckeditor_version = NULL;
  }
  $matches = array();
  if (preg_match('#,version:[\'\"]{1}(.*?)[\'\"]{1},#', $configcontents, $matches)) {
    $ckeditor_version = $matches[1];
    if ($ckeditor_version == '%VERSION%') {
      $ckeditor_version = '4.0.0';
    }
    if (!$main_version) {
      return $ckeditor_version;
    }
    $version = explode('.', $ckeditor_version);
    return trim($version[0]);
  }
  return $ckeditor_version = NULL;
}

/**
 * Implements hook_page_build().
 */
function ckeditor_page_build(&$page) {
  // Add our CSS file that adds common needed classes, such as align-left,
  // align-right, underline, indent, etc.
  $page['page_bottom']['ckeditor']['#attached']['css'] = array(
    drupal_get_path('module', 'ckeditor') . '/css/ckeditor.css' => array(
      'every_page' => TRUE,
    ),
  );
}

/**
 * Implements hook_form_FORM_ID_alter() for user_profile_form().
 */
function ckeditor_form_user_profile_form_alter(&$form, &$form_state) {
  if ($form['#user_category'] == 'account') {
    ckeditor_user_customize($form, $form_state, 'user_profile_form');
  }
}

/**
 * Implementation of hook_element_info_alter().
 *
 * Replace the textarea with CKEditor using a callback function (ckeditor_pre_render_text_format).
 */
function ckeditor_element_info_alter(&$types) {
  $types['text_format']['#pre_render'][] = 'ckeditor_pre_render_text_format';
}

/**
 * This function creates the HTML objects required for CKEditor.
 *
 * @param $element
 *   A fully populated form element to add the editor to.
 * @return
 *   The same $element with extra CKEditor markup and initialization.
 */
function ckeditor_pre_render_text_format($element) {
  static $init = FALSE;
  if (!isset($element['#format'])) {
    return $element;
  }

  module_load_include('inc', 'ckeditor', 'includes/ckeditor.lib');
  if ($init === FALSE) {
    $input_formats = ckeditor_profiles_compile();
    drupal_add_js(array('ckeditor' => array('input_formats' => $input_formats, 'plugins' => array())), 'setting');
    $init = TRUE;
  }

  if (isset($element['value'])) {
    if (!isset($element['format'])) {
      return $element;
    }
    if (isset($element['summary'])) {
      $element['value'] = ckeditor_load_by_field($element['value'], $element['format']['format'], TRUE, $element['summary']['#id']);
      $element['summary'] = ckeditor_load_by_field($element['summary'], $element['format']['format'], FALSE);
    }
    else {
      $element['value'] = ckeditor_load_by_field($element['value'], $element['format']['format']);
    }
  }
  else {
    $element = ckeditor_load_by_field($element, $element['#format']);
  }

  return $element;
}

/**
 * Load all profiles. Just load one profile if $name is passed in.
 */
function ckeditor_profile_load($name = '', $clear = FALSE, $check_access = TRUE) {
  static $profiles = array();
  global $user;

  if (empty($profiles) || $clear === TRUE) {
    $result = db_select('ckeditor_settings', 's')->fields('s')->execute();
    foreach ($result as $data) {
      $data->settings = unserialize($data->settings);
      $data->input_formats = array();

      $profiles[$data->name] = $data;
    }
    if ($check_access === FALSE) {
      // don't check if user has access to filter formats, needed for exporting as feature with drush
      $input_formats = filter_formats();
    } else {
      $input_formats = filter_formats($user);
    }
    $result = db_select('ckeditor_input_format', 'f')->fields('f')->execute();
    foreach ($result as $data) {
      if (isset($input_formats[$data->format])) {
        $profiles[$data->name]->input_formats[$data->format] = $input_formats[$data->format]->name;
      }
    }
  }

  return ($name ? (isset($profiles[urldecode($name)]) ? $profiles[urldecode($name)] : FALSE) : $profiles);
}

/**
 * Generate base path of the Drupal installation.
 *
 * @return
 *   Path of the Drupal installation.
 */
function ckeditor_base_path($mode = 'relative') {
  if ($mode == 'local') {
    return $cke_base_local_path = '.';
  }
  return rtrim(base_path(), '/');
}

/**
 * Generate module path of the CKEditor module.
 *
 * @return
 *   Path of CKEditor module.
 */
function ckeditor_module_path($mode = 'relative') {
  switch ($mode) {
    default:
    case 'relative':
      return ckeditor_base_path('relative') . '/' . drupal_get_path('module', 'ckeditor');
    case 'local':
      return ckeditor_base_path('local') . '/' . drupal_get_path('module', 'ckeditor');
    case 'url':
      return drupal_get_path('module', 'ckeditor');
  }
}

/**
 * Generate library path of the Drupal installation.
 *
 * @return
 *   Path of library in the Drupal installation.
 */
function ckeditor_library_path($mode = 'relative') {
  $lib_path = 'sites/all/libraries';

  if (function_exists('libraries_get_path')) {
    $path = libraries_get_path('ckeditor');
    if ($path !== FALSE) {
      $lib_path = drupal_substr($path, 0, strlen($path) - 9);
    }
  }
  switch ($mode) {
    default:
    case 'relative':
      return ckeditor_base_path('relative') . '/' . $lib_path;
    case 'local':
      return ckeditor_base_path('local') . '/' . $lib_path;
    case 'url':
      return $lib_path;
  }
}

/**
 * Read the CKEditor path from the Global profile.
 *
 * @return
 *   Path to CKEditor folder.
 */
function ckeditor_path($mode = 'relative', $refresh = FALSE) {
  static $cke_static;

  if (!isset($cke_static)) {
    $cke_static = array();
  }

  if ($refresh || !isset($cke_static[$mode])) {
    $global_profile = ckeditor_profile_load('CKEditor Global Profile', $refresh);
    switch ($mode) {
      default:
      case 'relative':
        if ($global_profile && isset($global_profile->settings['ckeditor_path'])) {
          // http:// OR https:// OR //
          if (preg_match("|^(http(s)?:)?//|i", $global_profile->settings['ckeditor_path'])) {
            return '<URL>';
          }
          $cke_path = $global_profile->settings['ckeditor_path'];
          $cke_path = strtr($cke_path, array("%b" => ckeditor_base_path('relative'), "%m" => ckeditor_module_path('relative'), "%l" => ckeditor_library_path('relative')));
          $cke_path = str_replace('\\', '/', $cke_path);
          $cke_path = str_replace('//', '/', $cke_path);
          return $cke_static[$mode] = $cke_path;
        }
        return $cke_static[$mode] = ckeditor_module_path('relative') . '/ckeditor';
      case 'local':
        if ($global_profile) {
          if (!empty($global_profile->settings['ckeditor_local_path'])) {
            return $cke_static[$mode] = $global_profile->settings['ckeditor_local_path'];
          }
          if (isset($global_profile->settings['ckeditor_path'])) {
            // http:// OR https:// OR //
            if (preg_match("|^(http(s)?:)?//|i", $global_profile->settings['ckeditor_path'])) {
              return '<URL>';
            }
            $cke_local_path = $global_profile->settings['ckeditor_path'];
            $cke_local_path = strtr($cke_local_path, array("%b" => ckeditor_base_path('local'), "%m" => ckeditor_module_path('local'), "%l" => ckeditor_library_path('local')));
            return $cke_static[$mode] = $cke_local_path;
          }
        }
        return $cke_static[$mode] = ckeditor_module_path('local') . '/ckeditor';
      case 'url':
        if ($global_profile && isset($global_profile->settings['ckeditor_path'])) {
          // http:// OR https:// OR //
          if (preg_match("|^(http(s)?:)?//|i", $global_profile->settings['ckeditor_path'])) {
            $cke_path = $global_profile->settings['ckeditor_path'];
          }
          else {
            $cke_path = $global_profile->settings['ckeditor_path'];
            $cke_path = strtr($cke_path, array("%m" => ckeditor_module_path('url'), "%l" => ckeditor_library_path('url')));
            $cke_path = str_replace('\\', '/', $cke_path);
            $cke_path = str_replace('//', '/', $cke_path);
            //In D7 base path in URL mode is not needed, so we need to remove it with trailing slash (if exists)
            $cke_path = str_replace(array("%b/", "%b"), '', $cke_path);
          }
          return $cke_static[$mode] = $cke_path;
        }
        return $cke_static[$mode] = ckeditor_module_path('url') . '/ckeditor';
    }
  }
  return $cke_static[$mode];
}

/**
 * Read the CKEditor plugins path from the Global profile.
 *
 * @return
 *   Path to CKEditor plugins folder.
 */
function ckeditor_plugins_path($mode = 'relative', $refresh = FALSE) {
  static $cke_static;

  if (!isset($cke_static)) {
    $cke_static = array();
  }

  if ($refresh || !isset($cke_static[$mode])) {
    $global_profile = ckeditor_profile_load('CKEditor Global Profile', $refresh);
    switch ($mode) {
      default:
      case 'relative':
        if ($global_profile && isset($global_profile->settings['ckeditor_plugins_path'])) {
          $cke_plugins_path = $global_profile->settings['ckeditor_plugins_path'];
          $cke_plugins_path = strtr($cke_plugins_path, array("%b" => ckeditor_base_path('relative'), "%m" => ckeditor_module_path('relative'), "%l" => ckeditor_library_path('relative')));
          $cke_plugins_path = str_replace('\\', '/', $cke_plugins_path);
          $cke_plugins_path = str_replace('//', '/', $cke_plugins_path);
          $cke_plugins_path = rtrim($cke_plugins_path, ' \/');
          return $cke_static[$mode] = $cke_plugins_path;
        }
        return $cke_static[$mode] = ckeditor_module_path('relative') . '/plugins';
      case 'local':
        if ($global_profile) {
          if (!empty($global_profile->settings['ckeditor_plugins_local_path'])) {
            return $cke_static[$mode] = $global_profile->settings['ckeditor_plugins_local_path'];
          }
          if (isset($global_profile->settings['ckeditor_plugins_path'])) {
            $cke_plugins_local_path = $global_profile->settings['ckeditor_plugins_path'];
            $cke_plugins_local_path = strtr($cke_plugins_local_path, array("%b" => ckeditor_base_path('local'), "%m" => ckeditor_module_path('local'), "%l" => ckeditor_library_path('local')));
            return $cke_static[$mode] = $cke_plugins_local_path;
          }
        }
        return $cke_static[$mode] = ckeditor_module_path('local') . '/plugins';
      case 'url':
        if ($global_profile && isset($global_profile->settings['ckeditor_plugins_path'])) {
          $cke_plugins_path = $global_profile->settings['ckeditor_plugins_path'];
          $cke_plugins_path = strtr($cke_plugins_path, array("%m" => ckeditor_module_path('url'), "%l" => ckeditor_library_path('url')));
          $cke_plugins_path = str_replace('\\', '/', $cke_plugins_path);
          $cke_plugins_path = str_replace('//', '/', $cke_plugins_path);
          $cke_plugins_path = rtrim($cke_plugins_path, ' \/');
          //In D7 base path in URL mode is not needed, so we need to remove it with trailing slash (if exists)
          $cke_plugins_path = str_replace(array("%b/", "%b"), '', $cke_plugins_path);
          return $cke_static[$mode] = $cke_plugins_path;
        }
        return $cke_static[$mode] = ckeditor_module_path('url') . '/plugins';
    }
  }
  return $cke_static[$mode];
}

/**
 * Read the CKFinder path from the Global profile.
 *
 * @return
 *   Path to CKFinder folder.
 */
function ckfinder_path($mode = 'relative', $refresh = FALSE) {
 static $cke_static;

  if (!isset($cke_static)) {
    $cke_static = array();
  }

  if ($refresh || !isset($cke_static[$mode])) {
    $global_profile = ckeditor_profile_load('CKEditor Global Profile', $refresh);
    switch ($mode) {
      default:
      case 'relative':
        if ($global_profile && isset($global_profile->settings['ckfinder_path'])) {
          $ckfinder_path = $global_profile->settings['ckfinder_path'];
          $ckfinder_path = strtr($ckfinder_path, array("%b" => ckeditor_base_path('relative'), "%m" => ckeditor_module_path('relative'), "%l" => ckeditor_library_path('relative')));
          $ckfinder_path = str_replace('\\', '/', $ckfinder_path);
          $ckfinder_path = str_replace('//', '/', $ckfinder_path);
          return $cke_static[$mode] = $ckfinder_path;
        }
        return $cke_static[$mode] = ckeditor_module_path('relative') . '/ckfinder';
      case 'local':
        if ($global_profile) {
          if (!empty($global_profile->settings['ckfinder_local_path'])) {
            return $cke_static[$mode] = $global_profile->settings['ckfinder_local_path'];
          }
          if (isset($global_profile->settings['ckfinder_path'])) {
            $ckfinder_path = $global_profile->settings['ckfinder_path'];
            $ckfinder_path = strtr($ckfinder_path, array("%b" => ckeditor_base_path('local'), "%m" => ckeditor_module_path('local'), "%l" => ckeditor_library_path('local')));
            return $cke_static[$mode] = $ckfinder_path;
          }
        }
        return $cke_static[$mode] = ckeditor_module_path('local') . '/ckfinder';
      case 'url':
        if ($global_profile && isset($global_profile->settings['ckfinder_path'])) {
          $ckfinder_path = $global_profile->settings['ckfinder_path'];
          $ckfinder_path = strtr($ckfinder_path, array("%m" => ckeditor_module_path('url'), "%l" => ckeditor_library_path('url')));
          $ckfinder_path = str_replace('\\', '/', $cke_plugins_path);
          $ckfinder_path = str_replace('//', '/', $cke_plugins_path);
          //In D7 base path in URL mode is not needed, so we need to remove it with trailing slash (if exists)
          $ckfinder_path = str_replace(array("%b/", "%b"), '', $ckfinder_path);
          return $cke_static[$mode] = $ckfinder_path;
        }
        return $cke_static[$mode] = ckeditor_module_path('url') . '/ckfinder';
    }
  }
  return $cke_static[$mode];
}

/**
 * Implementation of hook_features_api().
 *
 * Allow exporting of CKEditor profiles by the Features module.
 */
function ckeditor_features_api() {
  return array(
    'ckeditor_profile' => array(
      'name' => t('CKEditor profiles'),
      'feature_source' => TRUE,
      'default_hook' => 'ckeditor_profile_defaults',
      'default_file' => FEATURES_DEFAULTS_INCLUDED,
      'file' => drupal_get_path('module', 'ckeditor') . '/includes/ckeditor.features.inc',
    )
  );
}

/**
 * Implementation of hook_file_download().
 * Support for private downloads.
 * CKEditor does not implement any kind of potection on private files.
 */
function ckeditor_file_download($uri) {
  $result = db_query("SELECT f.* FROM {file_managed} f WHERE uri = :uri", array(':uri' => $uri));
  foreach ($result as $record) {
    return NULL;
  }
  if ($path = file_create_url($uri)) {
    //No info in DB? Probably a file uploaded with FCKeditor / CKFinder
    $global_profile = ckeditor_profile_load("CKEditor Global Profile");
    //Assume that files inside of ckeditor directory belong to the CKEditor. If private directory is set, let the decision about protection to the user.
    $private_dir_db = $private_dir = isset($global_profile->settings['private_dir']) ? trim($global_profile->settings['private_dir'], '\/') : '';
    $private_dir_db = str_replace(array('\\%u', '\\%n'), array('', ''), $private_dir_db);
    $private_dir = preg_quote($private_dir, '#');
    $private_dir = strtr($private_dir, array('%u' => '(\d+)', '%n' => '([\x80-\xF7 \w@.-]+)')); // regex for %n taken from user_validate_name() in user.module
    $private_dir = trim($private_dir, '\/');

    $regex = '#^' . preg_quote('private://', '#') . $private_dir . '#';

    if (!strstr($uri, 'private://') && !strstr($uri, 'public://')) {
      $path = 'private://' . $uri;
    }
    else {
      $path = $uri;
    }
    //check if CKEditor's "Enable access to files located in the private folder" option is disabled or enabled
    $allow_download_private_files = FALSE;
    if (isset($global_profile->settings['ckeditor_allow_download_private_files']) && $global_profile->settings['ckeditor_allow_download_private_files'] === 't') {
      $allow_download_private_files = TRUE;
    }
    //denied access to file if private upload is set and CKEditor's "Enable access to files located in the private folder" option is disabled
    if ($allow_download_private_files == FALSE)
      return NULL;
    //check if file can be served by comparing regex and path to file
    if (preg_match($regex, $path)) {
      $info = image_get_info($uri);
      return array('Content-Type' => $info['mime_type']);
    }
  }
}

/**
 * Implementation of hook_modules_uninstalled().
 *
 * Remove enabled plugins in CKEditor profiles added by uninstalled modules.
 */
function ckeditor_modules_uninstalled($modules) {
  module_load_include('inc', 'ckeditor', 'includes/ckeditor.lib');
  $profiles_list = ckeditor_profile_input_formats();
  $plugins_list = ckeditor_load_plugins();
  foreach ($profiles_list as $_profile => $_inputs) {
    $changed = FALSE;
    $profile = ckeditor_profile_load($_profile);
    if (!isset($profile->settings['loadPlugins'])) continue;
    foreach (array_keys((array) $profile->settings['loadPlugins']) as $plugin_name) {
      if (!array_key_exists($plugin_name, $plugins_list)) {
        unset($profile->settings['loadPlugins'][$plugin_name]);
        $changed = TRUE;
      }
    }
    if ($changed) {
      db_update('ckeditor_settings')
        ->fields(array(
          'settings' => serialize($profile->settings)
        ))
        ->condition('name', $profile->name, '=')
        ->execute();
    }
  }
}

/**
 * Implements hook_field_extra_fields().
 */
function ckeditor_field_extra_fields() {
  $fields['user']['user']['form']['ckeditor'] = array(
    'label' => t('Rich text editor settings'),
    'description' => t('Rich text editor settings'),
    'weight' => 10,
  );
  return $fields;
}