<?
/**
 * 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::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'=>'header/icon-48-purge.png',
			'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 . '(.*)';

		// Check if caching server is varnish or nginx.
		$sgcache_ip = '/etc/sgcache_ip';
		$hostname = $_SERVER['SERVER_ADDR'];
		$purge_method = "PURGE";
		if (file_exists($sgcache_ip)) {
			$hostname = trim( file_get_contents( $sgcache_ip, true ) );
			$purge_method = "BAN";
		}

		$cacheServerSocket = fsockopen($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);
	}
}
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						Gestalt, Brobygging og Intersubjektivitet, Intervju med Frank M. Staemmler					</span>
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							Gestalt, Brobygging og Intersubjektivitet, Intervju med Frank M. Staemmler					</h2>
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						<div itemprop="articleBody">
		<p>av Elisabeth Eie</p>
<p><img src="/images/FrankStaemmler.jpg" alt="" width="62" height="62" /></p>
<p>Frank Staemmler er etter hvert blitt godt kjent i gestaltmiljøet i Norge. Mange av oss har studert hans artikler og deltatt på hans workshops om blant annet empati og aggresjon (Staemmler, 2007; 2009a). Dagens studenter kan også oppleve ham som lærer i undervisningen på Norsk Gestaltinstitutt.  Frank er en belest og grundig teoretiker og en særdeles produktiv skribent. Han har så langt skrevet over 70 artikler og seks bøker om gestaltterapi. Han bidrar i stor grad til formidling av våre gestaltteoretiske røtter og til videreutvikling av disse, samt til å knytte gestaltteorien til filosofi og andre humanistiske og terapeutiske fagfelt.  I anledning hans gjesteundervisning på NGI i mai i år takket han ja til å bli intervjuet av Norsk Gestalttidsskrift.</p>
<p><em>(Last ned artikkelen for å lese mer...)</em></p> <div class="attachmentsContainer">

<div class="attachmentsList" id="attachmentsList_com_content_article_26">
<table>
<caption>Attachments:</caption>
<tbody>
<tr class="odd"><td class="at_filename"><a class="at_icon" href="http://gestaltsentrum.kombinasjoner.no/attachments/article/26/NGT-intrevju F. Stämmler-09.doc" title="Download this file (NGT-intrevju F. Stämmler-09.doc)"><img src="/media/com_attachments/images/file_icons/word.gif" alt="Download this file (NGT-intrevju F. Stämmler-09.doc)" /></a><a class="at_url" href="http://gestaltsentrum.kombinasjoner.no/attachments/article/26/NGT-intrevju F. Stämmler-09.doc" title="Download this file (NGT-intrevju F. Stämmler-09.doc)">Gestalt, Brobygging og Intersubjektivitet, Intervju med Frank M. Staemmler</a></td><td class="at_description">[Gestalt, Brobygging og Intersubjektivitet, Intervju med Frank M. Staemmler]</td><td class="at_file_size">1191 kB</td></tr>
</tbody></table>
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