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<?php |
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/** |
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* Xyster Framework |
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* |
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* LICENSE |
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* |
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* This source file is subject to the new BSD license that is bundled |
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* with this package in the file LICENSE.txt. |
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* It is also available through the world-wide-web at this URL: |
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* http://www.opensource.org/licenses/bsd-license.php |
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* If you did not receive a copy of the license and are unable to |
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* obtain it through the world-wide-web, please send an email |
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* to xyster@devweblog.org so we can send you a copy immediately. |
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* |
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* @category Xyster |
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* @package Xyster_Controller |
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* @copyright Copyright (c) 2007 Irrational Logic (http://devweblog.org) |
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* @license http://www.opensource.org/licenses/bsd-license.php New BSD License |
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* @version $Id: Cache.php 85 2007-09-13 00:07:24Z doublecompile $ |
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*/ |
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/** |
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* Zend_Controller_Action_Helper_Abstract |
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*/ |
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require_once 'Zend/Controller/Action/Helper/Abstract.php'; |
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/** |
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* Cache control action helper |
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* |
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* @category Xyster |
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* @package Xyster_Controller |
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* @subpackage Helpers |
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* @copyright Copyright (c) 2007 Irrational Logic (http://devweblog.org) |
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* @license http://www.opensource.org/licenses/bsd-license.php New BSD License |
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*/ |
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class Xyster_Controller_Action_Helper_Cache extends Zend_Controller_Action_Helper_Abstract |
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{ |
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/** |
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* The cache-control header to send |
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* |
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* This header has been tested to work successfully over SSL |
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*/ |
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const CACHE_CONTROL_HEADER = 'Cache-Control: private, must-revalidate, max-age=0, pre-check=0'; |
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|
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/** |
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* Checks the user's last mod date against the date supplied |
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* |
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* @param int $date |
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* @return boolean |
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*/ |
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public function direct( $date ) |
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{ |
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return $this->checkModifiedSince($date); |
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} |
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|
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/** |
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* Checks the user's last mod date against the date supplied |
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* |
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* All appropriate headers are sent. In the event the page hasn't been |
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* modified, the view renderer is disabled through the front controller. |
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* |
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* @param int $date |
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* @return boolean |
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*/ |
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public function checkModifiedSince( $date ) |
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{ |
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if ( $this->_wasModifiedSince($date) ) { |
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return true; |
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} |
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$this->_lastModified($date); |
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return false; |
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} |
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|
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/** |
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* Formats a date in GMT syntax suitable for HTTP headers |
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* |
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* @param int $date |
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* @return string |
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*/ |
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protected function _getGmDate( $date ) |
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{ |
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return gmdate('D, d M Y H:i:s', $date) . ' GMT'; |
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} |
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|
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/** |
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* Sends cache-control, last-modified, and etag headers |
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* |
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* @param int $date |
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*/ |
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protected function _lastModified($date) |
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{ |
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$gmdate = $this->_getGmDate($date); |
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|
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$this->getResponse()->setRawHeader(self::CACHE_CONTROL_HEADER) |
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->setRawHeader('Last-Modified: ' . $gmdate) |
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->setHeader('Etag', md5($gmdate)); |
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} |
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|
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/** |
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* Checks the date supplied against the if-modified-since header |
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* |
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* @param int $date |
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* @return boolean |
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*/ |
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protected function _wasModifiedSince( $date ) |
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{ |
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$since = $this->getRequest()->getServer('HTTP_IF_MODIFIED_SINCE'); |
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if ( $since && $this->_getGmDate($date) == preg_replace('/;.*$/', '', $since) ) { |
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// send the not modified headers |
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$this->getResponse()->setHttpResponseCode(304) |
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->setRawHeader('Status: 304 Not Modified') |
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->setHeader('Content-Length', 0, true); |
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// make sure the view renderer doesn't fire |
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require_once 'Zend/Controller/Front.php'; |
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Zend_Controller_Front::getInstance()->setParam('noViewRenderer', true); |
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return true; |
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} |
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return false; |
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} |
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} |
