<?php
/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
# ***** BEGIN LICENSE BLOCK *****
# This file is part of Plume Framework, a simple PHP Application Framework.
# Copyright (C) 2001-2007 Loic d'Anterroches and contributors.
#
# Plume Framework is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Plume Framework is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
# ***** END LICENSE BLOCK ***** */

/**
 * GoogleAnalytics middleware.
 *
 * Add the googleanalytics tracking code to the pages.
 */
class Pluf_Middleware_GoogleAnalytics
{
    /**
     * Process the response of a view.
     *
     * If the status code and content type are allowed, add the
     * tracking code.
     *
     * @param Pluf_HTTP_Request The request
     * @param Pluf_HTTP_Response The response
     * @return Pluf_HTTP_Response The response
     */
    function process_response($request, $response)
    {
        if (!Pluf::f('google_analytics_id', false)) {
            return $response;
        }
        if (!in_array($response->status_code, 
                     array(200, 201, 202, 203, 204, 205, 206, 404, 501))) {
            return $response;
        }
        $ok = false;
        $cts = array('text/html', 'text/html', 'application/xhtml+xml');
        foreach ($cts as $ct) {
            if (false !== strripos($response->headers['Content-Type'], $ct)) {
                $ok = true;
                break;
            }
        }
        if ($ok == false) {
            return $response;
        }
        $js = '<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src=\'" + gaJsHost + "google-analytics.com/ga.js\' type=\'text/javascript\'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
var pageTracker = _gat._getTracker("'.Pluf::f('google_analytics_id').'");
pageTracker._trackPageview();
</script>';
        $response->content = str_replace('</body>', $js.'</body>', $response->content);
        return $response;
    }
}