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<?php
/**
* @package Joomla.Platform
* @subpackage Cache
*
* @copyright Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Joomla! Cache page type object
*
* @since 11.1
*/
class JCacheControllerPage extends JCacheController
{
/**
* ID property for the cache page object.
*
* @var integer
* @since 11.1
*/
protected $_id;
/**
* Cache group
*
* @var string
* @since 11.1
*/
protected $_group;
/**
* Cache lock test
*
* @var stdClass
* @since 11.1
*/
protected $_locktest = null;
/**
* Get the cached page data
*
* @param boolean $id The cache data ID
* @param string $group The cache data group
*
* @return mixed Boolean false on no result, cached object otherwise
*
* @since 11.1
*/
public function get($id = false, $group = 'page')
{
// If an id is not given, generate it from the request
if ($id == false)
{
$id = $this->_makeId();
}
// If the etag matches the page id ... set a no change header and exit : utilize browser cache
if (!headers_sent() && isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
$etag = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
if ($etag == $id)
{
$browserCache = isset($this->options['browsercache']) ? $this->options['browsercache'] : false;
if ($browserCache)
{
$this->_noChange();
}
}
}
// We got a cache hit... set the etag header and echo the page data
$data = $this->cache->get($id, $group);
$this->_locktest = new stdClass;
$this->_locktest->locked = null;
$this->_locktest->locklooped = null;
if ($data === false)
{
$this->_locktest = $this->cache->lock($id, $group);
if ($this->_locktest->locked == true && $this->_locktest->locklooped == true)
{
$data = $this->cache->get($id, $group);
}
}
if ($data !== false)
{
$data = unserialize(trim($data));
$data = JCache::getWorkarounds($data);
$this->_setEtag($id);
if ($this->_locktest->locked == true)
{
$this->cache->unlock($id, $group);
}
return $data;
}
// Set ID and group placeholders
$this->_id = $id;
$this->_group = $group;
return false;
}
/**
* Stop the cache buffer and store the cached data
*
* @param mixed $data The data to store
* @param string $id The cache data ID
* @param string $group The cache data group
* @param boolean $wrkarounds True to use wrkarounds
*
* @return boolean
*
* @since 11.1
*/
public function store($data, $id, $group = null, $wrkarounds = true)
{
// Get page data from the application object
if (empty($data))
{
$data = JFactory::getApplication()->getBody();
}
// Get id and group and reset the placeholders
if (empty($id))
{
$id = $this->_id;
}
if (empty($group))
{
$group = $this->_group;
}
// Only attempt to store if page data exists
if ($data)
{
if ($wrkarounds)
{
$data = JCache::setWorkarounds(
$data,
array(
'nopathway' => 1,
'nohead' => 1,
'nomodules' => 1,
'headers' => true,
)
);
}
if ($this->_locktest->locked == false)
{
$this->_locktest = $this->cache->lock($id, $group);
}
$sucess = $this->cache->store(serialize($data), $id, $group);
if ($this->_locktest->locked == true)
{
$this->cache->unlock($id, $group);
}
return $sucess;
}
return false;
}
/**
* Generate a page cache id
*
* @return string MD5 Hash
*
* @since 11.1
* @todo Discuss whether this should be coupled to a data hash or a request hash ... perhaps hashed with a serialized request
*/
protected function _makeId()
{
return JCache::makeId();
}
/**
* There is no change in page data so send an unmodified header and die gracefully
*
* @return void
*
* @since 11.1
*/
protected function _noChange()
{
$app = JFactory::getApplication();
// Send not modified header and exit gracefully
header('HTTP/1.x 304 Not Modified', true);
$app->close();
}
/**
* Set the ETag header in the response
*
* @param string $etag The entity tag (etag) to set
*
* @return void
*
* @since 11.1
*/
protected function _setEtag($etag)
{
JFactory::getApplication()->setHeader('ETag', $etag, true);
}
}
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