File Source for download.php

<?php // $Id: download.php 12218 2007-05-01 18:27:14Z yannoo $
/*
==============================================================================
Dokeos - elearning and course management software
Copyright (c) 2008 Dokeos SPRL
For a full list of contributors, see "credits.txt".
The full license can be read in "license.txt".
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
See the GNU General Public License for more details.
Contact address: Dokeos, rue du Corbeau, 108, B-1030 Brussels, Belgium
info@dokeos.com
==============================================================================
*/
/**
==============================================================================
* This file is responsible for passing requested documents to the browser.
* Html files are parsed to fix a few problems with URLs,
* but this code will hopefully be replaced soon by an Apache URL
* rewrite mechanism.
*
* @package dokeos.document
==============================================================================
*/
/*
==============================================================================
MAIN CODE
==============================================================================
*/
session_cache_limiter('public');
include('../inc/global.inc.php');
$this_section=SECTION_COURSES;
include(api_get_path(LIBRARY_PATH).'document.lib.php');
// IMPORTANT to avoid caching of documents
header('Expires: Wed, 01 Jan 1990 00:00:00 GMT');
header('Cache-Control: public');
header('Pragma: no-cache');
//protection
api_protect_course_script(true);
$doc_url = $_GET['file'];
//change the '&' that got rewritten to '///' by mod_rewrite back to '&'
$doc_url = str_replace('///', '&', $doc_url);
//still a space present? it must be a '+' (that got replaced by mod_rewrite)
$doc_url = str_replace(' ', '+', $doc_url);
$doc_url = str_replace('/..', '', $doc_url); //echo $doc_url;
include(api_get_path(LIBRARY_PATH).'events.lib.inc.php');
if (! isset($_course))
{
api_not_allowed(true);
}
$full_file_name = api_get_path(SYS_COURSE_PATH).api_get_course_path().'/upload/blog/'.$doc_url;
//if the rewrite rule asks for a directory, we redirect to the course view
if (is_dir($full_file_name))
{
//remove last slash if present
while ($doc_url{$dul = strlen($doc_url)-1}=='/') $doc_url = substr($doc_url,0,$dul);
//create the path
$document_explorer = api_get_path(WEB_COURSE_PATH).api_get_course_path(); // home course path
//redirect
header('Location: '.$document_explorer);
}
$tbl_blogs_attachment = Database::get_course_table(TABLE_BLOGS_ATTACHMENT);
// launch event
event_download($doc_url);
$sql = 'SELECT filename FROM '.$tbl_blogs_attachment.' WHERE path LIKE BINARY "'.$doc_url.'"';
$result= api_sql_query($sql, __FILE__, __LINE__);
$row= Database::fetch_array($result);
DocumentManager::file_send_for_download($full_file_name,TRUE, $row['filename']);
exit;
?>

Source for file download.php