<?php
/**
 * Deliver Tracking Pixel
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage service
 */

WBClass::load('WBService');

/**
 * Deliver Tracking Pixel
 *
 * @version 0.1.1
 * @package WB
 * @subpackage service
 */
class WBService_Pixel extends WBService
{
   /**
    * Display
    *
    * @param int $status
    * @param mixed $data to be send
    * @param string $checksum
    * @return bool true
    */
    public function run(&$status, &$data, &$checksum = null)
    {
        // browser must revalidate
        $this->res->setCacheControl(WBResponse::CACHECONTROL_MUSTREVALIDATE);
        $this->res->setMaxAge(null);

        $lt =   WBClass::create('WBStatistic_LinkTracker');
        $lt->add();

        $stat   =   WBClass::create('WBStatistic_View');
        $stat->addPath(implode('/', $this->path), WBStatistic_View::NS_PIXEL);

        // make session read only to avoid blocking further requests
        $this->sess->close();

        $this->res->addHeader('Content-Disposition', 'inline; filename="px.gif"');
        $this->res->addHeader('Content-Type', 'image/gif');

        // Keep image in code
        //$file   =   WBParam::get('wb/dir/base') . '/htdoc/s/px.gif';
        //$px     =   base64_encode(file_get_contents($file));
        $px     =   'R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==';
        $data   =   base64_decode($px);

        /*
         * caching time in seconds
         * 60 * 60
         *  = 3600
         *  = 1 hour
         */
        $this->res->setMaxAge(3600);
        $this->res->addHeader('Content-Length', strlen($data));
        $this->res->addHeader('Accept-Ranges', 'bytes');

        $checksum   =   md5($data);
        $status     =   200;
        return true;
    }
}