<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Form
* @subpackage Decorator
* @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/** @see Zend_Form_Decorator_Abstract */
require_once 'Zend/Form/Decorator/Abstract.php';
/**
* ReCaptcha-based captcha decorator
*
* Adds hidden fields for challenge and response input, and JS for populating
* from known recaptcha IDs
*
* @category Zend
* @package Zend_Form
* @subpackage Element
* @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Form_Decorator_Captcha_ReCaptcha extends Zend_Form_Decorator_Abstract
{
/**
* Render captcha
*
* @param string $content
* @return string
*/
public function render($content)
{
$element = $this->getElement();
if (!$element instanceof Zend_Form_Element_Captcha) {
return $content;
}
$view = $element->getView();
if (null === $view) {
return $content;
}
$id = $element->getId();
$name = $element->getBelongsTo();
$placement = $this->getPlacement();
$separator = $this->getSeparator();
$challengeName = empty($name) ? 'recaptcha_challenge_field' : $name . '[recaptcha_challenge_field]';
$responseName = empty($name) ? 'recaptcha_response_field' : $name . '[recaptcha_response_field]';
$challengeId = $id . '-challenge';
$responseId = $id . '-response';
$captcha = $element->getCaptcha();
$markup = $captcha->render($view, $element);
// Create hidden fields for holding the final recaptcha values
// Placing "id" in "attribs" to ensure it is not overwritten with the name
$hidden = $view->formHidden(array(
'name' => $challengeName,
'attribs' => array('id' => $challengeId),
));
$hidden .= $view->formHidden(array(
'name' => $responseName,
'attribs' => array('id' => $responseId),
));
// Create a window.onload event so that we can bind to the form.
// Once bound, add an onsubmit event that will replace the hidden field
// values with those produced by ReCaptcha
// zendBindEvent mediates between Mozilla's addEventListener and
// IE's sole support for addEvent.
$js =<<<EOJ
<script type="text/javascript" language="JavaScript">
function windowOnLoad(fn) {
var old = window.onload;
window.onload = function() {
if (old) {
old();
}
fn();
};
}
function zendBindEvent(el, eventName, eventHandler) {
if (el.addEventListener){
el.addEventListener(eventName, eventHandler, false);
} else if (el.attachEvent){
el.attachEvent('on'+eventName, eventHandler);
}
}
windowOnLoad(function(){
zendBindEvent(
document.getElementById("$challengeId").form,
'submit',
function(e) {
document.getElementById("$challengeId").value = document.getElementById("recaptcha_challenge_field").value;
document.getElementById("$responseId").value = document.getElementById("recaptcha_response_field").value;
}
);
});
</script>
EOJ;
// Always place the hidden fields before the captcha markup, and follow
// with the JS from above
switch ($placement) {
case 'PREPEND':
$content = $hidden . $markup . $js . $separator . $content;
break;
case 'APPEND':
default:
$content = $content . $separator . $hidden . $markup . $js;
}
return $content;
}
}