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<?php
/**
* TPage class file
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Web\UI
*/
namespace Prado\Web\UI;
/**
* TPageStateFormatter class.
*
* TPageStateFormatter is a utility class to transform the page state
* into and from a string that can be properly saved in persistent storage.
*
* Depending on the {@link TPage::getEnableStateValidation() EnableStateValidation}
* and {@link TPage::getEnableStateEncryption() EnableStateEncryption},
* TPageStateFormatter may do HMAC validation and encryption to prevent
* the state data from being tampered or viewed.
* The private keys and hashing/encryption methods are determined by
* {@link TApplication::getSecurityManager() SecurityManager}.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package Prado\Web\UI
* @since 3.1
*/
class TPageStateFormatter
{
/**
* @param TPage
* @param mixed state data
* @return string serialized data
*/
public static function serialize($page,$data)
{
$sm=$page->getApplication()->getSecurityManager();
if($page->getEnableStateValidation())
$str=$sm->hashData(serialize($data));
else
$str=serialize($data);
if($page->getEnableStateCompression() && extension_loaded('zlib'))
$str=gzcompress($str);
if($page->getEnableStateEncryption())
$str=$sm->encrypt($str);
return base64_encode($str);
}
/**
* @param TPage
* @param string serialized data
* @return mixed unserialized state data, null if data is corrupted
*/
public static function unserialize($page,$data)
{
$str=base64_decode($data);
if($str==='')
return null;
if($str!==false)
{
$sm=$page->getApplication()->getSecurityManager();
if($page->getEnableStateEncryption())
$str=$sm->decrypt($str);
if($page->getEnableStateCompression() && extension_loaded('zlib'))
$str=@gzuncompress($str);
if($page->getEnableStateValidation())
{
if(($str=$sm->validateData($str))!==false)
return unserialize($str);
}
else
return unserialize($str);
}
return null;
}
}
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