<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * 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@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Captcha
 * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Captcha controller
 *
 * @category   Mage
 * @package    Mage_Core
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Captcha_Adminhtml_RefreshController extends Mage_Adminhtml_Controller_Action
{
    /**
     * Refreshes captcha and returns JSON encoded URL to image (AJAX action)
     * Example: {'imgSrc': 'http://example.com/media/captcha/67842gh187612ngf8s.png'}
     *
     * @return null
     */
    public function refreshAction()
    {
        $formId = $this->getRequest()->getPost('formId');
        $captchaModel = Mage::helper('captcha')->getCaptcha($formId);
        $this->getLayout()->createBlock($captchaModel->getBlockName())->setFormId($formId)->setIsAjax(true)->toHtml();
        $this->getResponse()->setBody(json_encode(array('imgSrc' => $captchaModel->getImgSrc())));
        $this->setFlag('', self::FLAG_NO_POST_DISPATCH, true);
    }
}