<?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_Adminhtml
 * @copyright   Copyright (c) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Encrypted config field backend model
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 */
class Mage_Adminhtml_Model_System_Config_Backend_Encrypted extends Mage_Core_Model_Config_Data
{

    /**
     * Decrypt value after loading
     *
     */
    protected function _afterLoad()
    {
        $value = (string)$this->getValue();
        if (!empty($value) && ($decrypted = Mage::helper('core')->decrypt($value))) {
            $this->setValue($decrypted);
        }
    }

    /**
     * Encrypt value before saving
     *
     */
    protected function _beforeSave()
    {
        $value = (string)$this->getValue();
        // don't change value, if an obscured value came
        if (preg_match('/^\*+$/', $this->getValue())) {
            $value = $this->getOldValue();
        }
        if (!empty($value) && ($encrypted = Mage::helper('core')->encrypt($value))) {
            $this->setValue($encrypted);
        }
    }

    /**
     * Get & decrypt old value from configuration
     *
     * @return string
     */
    public function getOldValue()
    {
        return Mage::helper('core')->decrypt(parent::getOldValue());
    }
}