egroupware_official/api/anon_images.php

53 lines
1.6 KiB
PHP

<?php
/**
* EGroupware - Anonymous images for login page
*
* Images are store in EGroupware files-directory in subdirectory "anon-images"
*
* @link http://www.egroupware.org
* @author Ralf Becker <rb-at-egroupware.org>
* @license http://opensource.org/licenses/lgpl-license.php LGPL - GNU Lesser General Public License
* @package api
* @subpackage login
*/
use EGroupware\Api;
$GLOBALS['egw_info'] = array('flags' => array(
'disable_Template_class' => True,
'noheader' => True,
// misuse session creation callback to send the image, in case we have no session
'autocreate_session_callback' => 'send_image',
'currentapp' => 'api',
));
require('../header.inc.php');
send_image();
function send_image()
{
$path = $GLOBALS['egw_info']['server']['files_dir'] . '/anon-images';
if (!file_exists($path) || empty($_GET['src']) ||
basename($_GET['src']) !== $_GET['src'] || // make sure no directory traversal
!preg_match('/^[a-z 0-9._-]+\.(jpe?g|png|gif|svg|ico)$/i', $_GET['src']) || // only allow images, not eg. Javascript!
!file_exists($path .= '/' . $_GET['src']) ||
!($fp = fopen($path, 'r')))
{
error_log(__FILE__ . ": _GET[src]='$_GET[src]', path=$path returning HTTP status 404 Not Found");
http_response_code(404);
}
else
{
Api\Session::cache_control(864000); // 10 days
$size = filesize($path);
header('ETag: "' . md5($_GET['src'] . $size . filemtime($path)) . '"');
header('Content-Type: ' . Api\MimeMagic::filename2mime($_GET['src']));
header('Content-Length: ' . $size);
fpassthru($fp);
fclose($fp);
}
exit;
}