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* @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\WebAsset\AssetItem; \defined('JPATH_PLATFORM') or die; use Joomla\CMS\Document\Document; use Joomla\CMS\Factory; use Joomla\CMS\Router\Route; use Joomla\CMS\WebAsset\WebAssetAttachBehaviorInterface; use Joomla\CMS\WebAsset\WebAssetItem; /** * Web Asset Item class for Keepalive asset * * @since 4.0.0 */ class KeepaliveAssetItem extends WebAssetItem implements WebAssetAttachBehaviorInterface { /** * Method called when asset attached to the Document. * Useful for Asset to add a Script options. * * @param Document $doc Active document * * @return void * * @since 4.0.0 */ public function onAttachCallback(Document $doc) { $app = Factory::getApplication(); $sessionHandler = $app->get('session_handler', 'database'); // If the handler is not 'Database', we set a fixed, small refresh value (here: 5 min) $refreshTime = 300; if ($sessionHandler === 'database') { $lifeTime = $app->getSession()->getExpire(); $refreshTime = $lifeTime <= 60 ? 45 : $lifeTime - 60; // The longest refresh period is one hour to prevent integer overflow. if ($refreshTime > 3600 || $refreshTime <= 0) { $refreshTime = 3600; } } // If we are in the frontend or logged in as a user, we can use the ajax component to reduce the load $uri = 'index.php' . ($app->isClient('site') || !Factory::getUser()->guest ? '?option=com_ajax&format=json' : ''); // Add keepalive script options. $doc->addScriptOptions('system.keepalive', array('interval' => $refreshTime * 1000, 'uri' => Route::_($uri))); } }