<?php

/**
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Andreas Gohr <andi@splitbrain.org>
 */

if (!defined('DOKU_INC')) define('DOKU_INC', __DIR__ . '/../../../');
define('NOSESSION', true);
require_once(DOKU_INC . 'inc/init.php');

global $conf;

// let the syntax plugin do the work
$data = $_REQUEST;
$plugin = plugin_load('syntax', 'graphviz');
$cache = $plugin->imgFile($data);
if (!$cache) fail();
$time = filemtime($cache);

header('Content-Type: image/svg+xml');
header('Expires: ' . gmdate("D, d M Y H:i:s", time() + max($conf['cachetime'], 3600)) . ' GMT');
header('Cache-Control: public, proxy-revalidate, no-transform, max-age=' . max($conf['cachetime'], 3600));
header('Pragma: public');
http_conditionalRequest($time);
echo io_readFile($cache, false);


function fail()
{
    header("HTTP/1.0 404 Not Found");
    header('Content-Type: image/png');
    echo io_readFile('broken.png', false);
    exit;
}