/**
* Siteground Joomla Cache Plugin
*
* Flushes varnish cache when certain data change actions are invoked. Disables varnish cache
* on SiteGround servers when users are logged in.
*
* @author George Penkov
* @category Siteground Joomla Plugins
* @package Siteground Joomla Cache Plugin
*/
defined('_JEXEC') or die();
JLoader::import('joomla.plugin.plugin');
JLoader::import('joomla.error.log');
/**
* jSGCache Plugin
*
* @package jSGCache
* @subpackage System
*/
class plgSystemjSGCache extends JPlugin
{
/**
* JRegistry parameter object for the plugin.
* @var JRegistry
*/
public $params = null;
/**
* Web path to the joomla application.
* @var string
*/
private $_applicationPath = null;
/**
* Global cache flag.
* @var bool
*/
private $_cacheEnabled = false;
/**
* Auto flush flag
* @var bool
*/
private $_autoflush = false;
/**
* 3rd party auto flush flag
* @var bool
*/
private $_autoflush3rdParty = false;
/**
* Client side auto flush flag
* @var bool
*/
private $_autoflushClientSide = false;
/**
* Which tasks to ignore in the flush monitor
* @var array
*/
private static $_ignoreTasks = array('login','logout','user.login','user.logout');
/**
* Constructor
*
* @access public
* @param object &$subject The object to observe
*/
public function __construct( &$subject )
{
if(isset($_GET['sgCacheCheck']) && $_GET['sgCacheCheck'] == md5('joomlaCheck'))
die('OK');
parent::__construct( $subject );
$plugin = JPluginHelper::getPlugin('system','jSGCache');
$this->params= new JRegistry();
$this->params->loadString($plugin->params, 'JSON');
$this->_cacheEnabled = $this->params->get('cache_enabled');
if ($this->_cacheEnabled === null)
$this->_cacheEnabled == 1;
$this->_autoflush = $this->params->get('autoFlush');
if ($this->_autoflush === null)
$this->_autoflush = 1;
$this->_autoflush3rdParty = $this->params->get('autoFlush-ThirdParty');
if ($this->_autoflush3rdParty === null)
$this->_autoflush3rdParty = 1;
$this->_autoflushClientSide = $this->params->get('autoFlush-ClientSide');
if ($this->_autoflushClientSide === null)
$this->_autoflushClientSide = 0;
}
/**
* Heartbeat cache checking function. Will also monitor $_GET for the jSGCache parameter
* (pressing the purge cache button in admin)
*
*
* @access public
* @return null
*/
public function onAfterInitialise()
{
if (!$this->_cacheEnabled || $this->_isBlacklisted($this->_applicationPath))
{
JResponse::setHeader('X-Cache-Enabled','False',true);
return;
}
if ($this->_cacheEnabled)
{
JResponse::allowCache(true);
JResponse::setHeader('X-Cache-Enabled','True',true);
}
//Init the application url
$this->_applicationPath = str_replace(array('administrator/index.php','index.php'),'',str_replace($_SERVER['DOCUMENT_ROOT'],'',$_SERVER['SCRIPT_FILENAME']));
//Check for any admin action and proceed to flushMonitor and 3rd party plugins
if ( isset($_POST['task']) || isset($_GET['task']) || isset($_GET['cart_virtuemart_product_id']))
{
$this->_flushMonitor();
if ($this->_autoflush3rdParty)
$this->_monitorThirdPartyPlugins();
}
//Check if we have a logged in user and enable cache bypass cookie 'task' => string 'user.login'
$user = JFactory::getUser();
if (!$user->guest || (isset($_POST['task']) && preg_match('/login/i', $_POST['task'])))
{
$_POST[JSession::getFormToken()] = 1; //Force the correct token, since the login box on the page is cached with the 1st visitors' token
//Enable the cache bypass for logged users by setting a cache bypass cookie
setcookie('jSGCacheBypass',1,time() + 6000,'/');
}
if ($user->guest || (isset($_POST['task']) && $_POST['task'] == 'user.logout'))
{
//Remove the bypass cookie if not a logged user
if (isset($_COOKIE['jSGCacheBypass']))
setcookie('jSGCacheBypass',0, time() - 3600,'/');
}
// Handle purge button press when get has jSGCache=purge, but only in admin with a logged user
if(isset($_GET['jSGCache']) && $_GET['jSGCache'] == 'purge' && JFactory::getApplication()->isAdmin() && !$user->guest )
$this->_purgeCache(true);
}
/**
* Admin panel icon display
*
* @access public
* @param string $context
* @return array
*/
public function onGetIcons( $context )
{
return array(array(
'link'=>'?jSGCache=purge',
'image'=>'refresh',
'text'=>JText::_('Purge jSGCache'),
'id'=>'jSGCache'
));
}
/**
* Calls the cache server to purge the cache
*
* @access public
* @param string|bool $message Message to be displayed if purge is successful. If this param is false no output would be done
* @return null
*/
private function _purgeCache( $message = true )
{
$purgeRequest = $this->_applicationPath . '(.*)';
// Construct the PURGE request
$hostname = str_replace( 'www.', '', $_SERVER['HTTP_HOST'] );
$purge_method = "PURGE";
$cacheServerSocket = fsockopen($hostname, 80, $errno, $errstr, 2);
if(!$cacheServerSocket)
{
JError::raise(E_ERROR,500,JText::_('Connection to cache server failed!'));
JError::raise(E_ERROR,500,JText::_($errstr ($errno)));
return;
}
$request = "$purge_method {$purgeRequest} HTTP/1.0\r\nHost: {$_SERVER['SERVER_NAME']}\r\nConnection: Close\r\n\r\n";
if (preg_match('/^www\./',$_SERVER['SERVER_NAME']))
{
$domain_no_www = preg_replace('/^www\./', '', $_SERVER['SERVER_NAME']);
$request2 = "$purge_method {$purgeRequest} HTTP/1.0\r\nHost: {$domain_no_www}\r\nConnection: Close\r\n\r\n";
}
else
$request2 = "$purge_method {$purgeRequest} HTTP/1.0\r\nHost: www.{$_SERVER['SERVER_NAME']}\r\nConnection: Close\r\n\r\n";
fwrite($cacheServerSocket, $request);
$response = fgets($cacheServerSocket);
fclose($cacheServerSocket);
$cacheServerSocket = fsockopen($hostname, 80, $errno, $errstr, 2);
fwrite($cacheServerSocket, $request2);
fclose($cacheServerSocket);
if($message !== false)
{
if(preg_match('/200/',$response))
{
if ($message === true)
JFactory::getApplication()->enqueueMessage(JText::_('SG Cache Successfully Purged!'));
else
JFactory::getApplication()->enqueueMessage(JText::_( $message ));
}
else
{
JError::raise(E_NOTICE,501, JText::_('SG Cache: Purge was not successful!'));
JError::raise(E_NOTICE,501, jText::_('Error: ' . $response));
}
}
}
/**
* Check if url is in caching blacklist
*
* @param string $applicationPath
*
* @return bool
*/
private function _isBlacklisted($applicationPath)
{
$blacklistArray = explode("\n",$this->params->get('blacklist'));
$blacklistRegexArray = array();
$indexIsBlacklisted = false;
foreach($blacklistArray as $key=>$row)
{
$row = trim($row);
if ($row != '/' && $quoted = preg_quote($row,'/'))
$blacklistRegexArray[$key] = $quoted;
if ($row == '/')
$indexIsBlacklisted = true;
}
if ($indexIsBlacklisted && $_SERVER['REQUEST_URI'] == $applicationPath)
return true;
if (empty($blacklistRegexArray))
return false;
$blacklistRegex = '/('.implode('|',$blacklistRegexArray) . ')/i';
return preg_match($blacklistRegex, $_SERVER['REQUEST_URI']);
}
/**
* 3rd party plugin monitor
*
* @access private
* @return null
*/
private function _monitorThirdPartyPlugins()
{
// Kunena & K2
if ($this->params->get('autoFlush-ThirdParty') == 1 && isset($_POST['option']) &&
($_POST['option']=='com_k2' || $_POST['option' ]== 'com_kunena'))
{
$this->_purgeCache(false);
}
// VirtueMart
if ( (isset($_POST['option']) && $_POST['option'] == 'com_virtuemart') ||
( isset($_GET['option']) && $_GET['option'] == 'com_virtuemart' ) ||
isset($_GET['cart_virtuemart_product_id']) )
{
if($this->params->get('autoFlush-ThirdParty') == 1)
$this->_purgeCache(false);
}
}
/**
* Action monitor
*
* @access private
* @return null
*/
private function _flushMonitor()
{
$user = JFactory::getUser();
if ((!JFactory::getApplication()->isAdmin() && !$this->_autoflushClientSide) || $user->guest)
return;
$autoflush = $this->params->get('autoFlush');
if ($autoflush === null)
$autoflush = 1;
if (isset($_POST['task']) && $_POST['task'] && !in_array($_POST['task'],self::$_ignoreTasks) && $autoflush == 1)
$this->_purgeCache(false);
}
}
Infodynamica - Diensten / tarieven
Voor het ontwikkelen van een applicatie hanteer ik andere prijzen dan voor het ontwikkelen van een website.
Dit heeft vooral te maken met de inspanningen die ik moet leveren. De ene opdracht zal meer tijd in beslag nemen dan de andere. Het ontwikkelen van applicaties is dikwijls maatwerk. Ik maak een ontwerp dat is afgestemd op jouw huisstijl, waarmee jij efficiënt en prettig kunt werken. Bij het ontwikkelen van websites met Joomla! worden bestaande modules tot één geheel gesmeed, afgestemd op jouw persoonlijke wensen.
Omdat ik parttime ondernemer ben, kan ik de kosten voor het ontwikkelen van applicaties of websites laag houden. Na een vrijblijvend kennismakingsgesprek stel ik een offerte op. Accepteer je deze, dan gaan we aan de slag!
Alle genoemde prijzen zijn exclusief BTW.
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