source: extensions/captcha/main.inc.php @ 8030

<?php
/*
Plugin Name: Captcha
Version: auto
Description: Add captcha to registration form
Plugin URI: auto
Author: P@t
Author URI: http://piwigo.org
*/

if (!defined('PHPWG_ROOT_PATH')) die('Hacking attempt!');
define('CAPTCHA_PATH' , PHPWG_PLUGINS_PATH . basename(dirname(__FILE__)) . '/');

global $conf;

if (script_basename() == 'register'
  and !empty($conf['captcha_publickey'])
  and !empty($conf['captcha_privatekey']))
{
  include(CAPTCHA_PATH.'recaptchalib.php');
  add_event_handler('loc_end_page_header', 'add_captcha');
  add_event_handler('register_user_check', 'check_captcha');
}

if (script_basename() == 'admin')
{
  add_event_handler('get_admin_plugin_menu_links', 'captcha_plugin_admin_menu' );
}

function add_captcha()
{
  global $template, $conf;
  $template->set_prefilter('register', 'captcha_prefilter');
  $template->assign('CAPTCHA', recaptcha_get_html($conf['captcha_publickey'], get_plugin_data('captcha')));
}

function captcha_prefilter($content, $smarty)
{
  $search = '<p class="bottomButtons">';
  $captcha = '<div>{$CAPTCHA}</div>';
  $js = '<script type= "text/javascript">var RecaptchaOptions = {ldelim} theme: "white", lang : "{$lang_info.code}" };</script>';
  $css = '{html_head}<style type="text/css">#recaptcha_area {ldelim} margin: 25px auto; }</style>{/html_head}';

  return str_replace($search, $js."\n".$css."\n".$captcha."\n".$search, $content);
}

function check_captcha($errors)
{
  global $conf;

  $resp = recaptcha_check_answer(
    $conf['captcha_privatekey'],
    $_SERVER["REMOTE_ADDR"],
    $_POST["recaptcha_challenge_field"],
    $_POST["recaptcha_response_field"]
  );

  if (!$resp->is_valid)
  {
    load_language('plugin.lang', CAPTCHA_PATH);
    array_push($errors, l10n('Invalid Captcha'));
    set_plugin_data('captcha', $resp->error);
  }

  return $errors;
}

function captcha_plugin_admin_menu($menu)
{
        global $page,$conf;

        if ( (empty($conf['captcha_publickey']) or empty($conf['captcha_publickey']))
    and in_array($page['page'], array('intro','plugins_list')) )
        {
                load_language('plugin.lang', CAPTCHA_PATH);
                $page['errors'][] = l10n('You need to define Captcha keys');
        }

        array_push($menu,
                        array(
                                'NAME' => 'Captcha',
                                'URL' => get_admin_plugin_menu_link(dirname(__FILE__).'/admin.php')
                        )
                );
        return $menu;
}

?>