*/
class action_plugin_recaptcha extends DokuWiki_Action_Plugin {
private $recaptchaLangs = array('en', 'nl', 'fr', 'de', 'pt', 'ru', 'es', 'tr');
/**
* get plugin info
*
*/
function getInfo()
{
return confToHash(dirname(__FILE__).'../info.txt');
}
/**
* register an event hook
*
*/
function register(&$controller)
{
// only register the hooks if the necessary config paramters exist
if($this->getConf('publickey') && $this->getConf('privatekey')) {
$controller->register_hook('ACTION_ACT_PREPROCESS',
'BEFORE',
$this,
'preprocess',
array());
// new hook
$controller->register_hook('HTML_REGISTERFORM_OUTPUT',
'BEFORE',
$this,
'insert',
array('oldhook' => false));
// old hook
$controller->register_hook('HTML_REGISTERFORM_INJECTION',
'BEFORE',
$this,
'insert',
array('oldhook' => true));
// old hook
$controller->register_hook('HTML_EDITFORM_INJECTION',
'BEFORE',
$this,
'insert',
array('editform' => true, 'oldhook' => true));
// new hook
$controller->register_hook('HTML_EDITFORM_OUTPUT',
'BEFORE',
$this,
'insert',
array('editform' => true, 'oldhook' => false));
}
}
/**
* insert html code for recaptcha into the register form
*
* @param obj $event
* @param array $param
*/
function insert(&$event, $param) {
global $conf;
// do nothing if logged in user and no CAPTCHA required
if(!$this->getConf('forusers') && $_SERVER['REMOTE_USER']){
return;
}
$recaptcha = '';
// see first if a language is defined for the plugin, if not try to use the language defined for dokuwiki
$lang = $this->getConf('lang') ? $this->getConf('lang') : (in_array($conf['lang'], $this->recaptchaLangs) ? $conf['lang'] : 'en');
$recaptcha .= "";
$recaptcha .= recaptcha_get_html($this->getConf('publickey'));
if($param['oldhook']) {
echo $recaptcha;
} else {
$pos = $event->data->findElementByAttribute('type','submit');
$event->data->insertElement($pos++, $recaptcha);
}
}
/**
* process the answer to the captcha
*
* @param obj $event
* @param array $param
*
*/
function preprocess(&$event, $param) {
// get and clean the action
$act = $this->_act_clean($event->data);
// do nothing if logged in user and no CAPTCHA required
if(!$this->getConf('forusers') && $_SERVER['REMOTE_USER']){
return(0);
}
if (($act == 'register' && $_POST['save']) || ($act == 'show' && $_REQUEST['comment'] == 'add')) {
$resp = recaptcha_check_answer ($this->getConf('privatekey'),
$_SERVER["REMOTE_ADDR"],
$_POST["recaptcha_challenge_field"],
$_POST["recaptcha_response_field"]);
if (!$resp->is_valid) {
msg($this->getLang('testfailed'),-1);
$_POST['save'] = 0; #for register
return 'recapchta not valid';
}
return (0);
}
return 'unknown action';
}
/**
* Pre-Sanitize the action command
*
* Similar to act_clean in action.php but simplified and without
* error messages
* (taken from Andreas Gohrs captcha plugin)
*/
function _act_clean($act){
// check if the action was given as array key
if(is_array($act)){
list($act) = array_keys($act);
}
//remove all bad chars
$act = strtolower($act);
$act = preg_replace('/[^a-z_]+/','',$act);
return $act;
}
} //end of action class