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<?php
class THiddenFieldPageStatePersister extends TComponent implements IPageStatePersister, IModule
{
private $_application;
private $_id='persister';
/**
* Initializes the service.
* This method is required by IModule interface.
* @param TApplication application
* @param TXmlElement module configuration
*/
public function init($application, $config)
{
$this->_application=$application;
$application->getService()->setPageStatePersister($this);
}
/**
* @return string id of this module
*/
public function getID()
{
return $this->_id;
}
/**
* @param string id of this module
*/
public function setID($value)
{
$this->_id=$value;
}
public function save($state)
{
$data=Prado::serialize($state);
$hmac=$this->computeHMAC($data,$this->getKey());
if(extension_loaded('zlib'))
$data=gzcompress($hmac.$data);
else
$data=$hmac.$data;
$this->_application->getService()->getRequestedPage()->getClientScript()->registerHiddenField(TPage::FIELD_PAGESTATE,base64_encode($data));
}
public function load()
{
$str=base64_decode($this->_application->getRequest()->getItems()->itemAt(TPage::FIELD_PAGESTATE));
if($str==='')
return null;
if(extension_loaded('zlib'))
$data=gzuncompress($str);
else
$data=$str;
if($data!==false && strlen($data)>32)
{
$hmac=substr($data,0,32);
$state=substr($data,32);
if($hmac===$this->computeHMAC($state,$this->getKey()))
return Prado::unserialize($state);
}
throw new Exception('viewstate data is corrupted.');
}
private function getKey()
{
return 'abcdefe';
}
private function computeHMAC($data,$key)
{
if (strlen($key) > 64)
$key = pack('H32', md5($key));
else if (strlen($key) < 64)
$key = str_pad($key, 64, "\0");
return md5((str_repeat("\x5c", 64) ^ substr($key, 0, 64)) . pack('H32', md5((str_repeat("\x36", 64) ^ substr($key, 0, 64)) . $data)));
}
}
?>
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