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 <?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) 2005-2015 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) 2005-2015 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;
     }
 }