<?php
/* See license terms in /license.txt */
/**
 * Script that allows download of a specific file from external applications
 * @author Arnaud Ligot <arnaud@cblue.be>, Based on work done for old videoconference application (I have about 30 minutes to write this peace of code so if somebody has more time, feel free to rewrite it...)
 */
/**
 * Script that allows remote download of a file
 * @param string Action parameter (action=...)
 * @param string Course code (cidReq=...)
 * @param string Current working directory (cwd=...)
 * @return string JSON output
 */ 
/* FIX for IE cache when using https */
session_cache_limiter('none');
/*==== DEBUG ====*/
$debug=0;
if ($debug>0) {
    // dump the request
    $v = array_keys(get_defined_vars());
    error_log(var_export($v, true),3, '/tmp/log');
    foreach (array_keys(get_defined_vars()) as $k) {
        if ($k == 'GLOBALS') {
            continue;
        }
        error_log($k, 3, '/tmp/log');
        error_log(var_export($$k, true), 3, '/tmp/log');
    }
}
/*==== INCLUDE ====*/
require_once '../inc/global.inc.php';
api_block_anonymous_users();
require_once (api_get_path(LIBRARY_PATH).'course.lib.php');
require_once (api_get_path(LIBRARY_PATH).'document.lib.php');
require_once ('../newscorm/learnpath.class.php');
/*==== Variables initialisation ====*/
$action = $_REQUEST['action']; //safe as only used in if()'s
$seek = array('/','%2F','..');
$destroy = array('','','');
$cidReq = str_replace($seek,$destroy,$_REQUEST["cidReq"]);
$cidReq = Security::remove_XSS($cidReq);
$user_id = api_get_user_id();
$coursePath = api_get_path(SYS_COURSE_PATH).$cidReq.'/document';
$_course = CourseManager::get_course_information($cidReq);
if ($_course == null) die ("problem when fetching course information");
// stupid variable initialisation for old version of DocumentManager functions.
$_course['path'] = $_course['directory'];
$_course['dbName'] = $_course['db_name'];
$is_manager = (CourseManager::get_user_in_course_status($user_id, $cidReq) == COURSEMANAGER);
if ($debug>0) { error_log($coursePath, 0); }
// FIXME: check security around $_REQUEST["cwd"]
$cwd = $_REQUEST['cwd'];
// treat /..
$nParent = 0; // the number of /.. into the url
while (substr($cwd, -3, 3) == '/..') {
    // go to parent directory
    $cwd= substr($cwd, 0, -3);
    if (strlen($cwd) == 0) { $cwd='/'; }
    $nParent++;
}
for (;$nParent >0; $nParent--) {
    $cwd = (strrpos($cwd,'/')>-1 ? substr($cwd, 0, strrpos($cwd,'/')) : $cwd);
}
if (strlen($cwd) == 0) { $cwd='/'; }
if (Security::check_abs_path($cwd,api_get_path(SYS_PATH))) {
    die();
}
if ($action == 'list') {
    /*==== List files ====*/
    if ($debug>0) { error_log("sending file list",0); }

    // get files list
    $files = DocumentManager::get_all_document_data($_course, $cwd, 0, NULL, false);

    // adding download link to files
    foreach ($files as $k=>$f) {
        if ($f['filetype'] == 'file') {
            //$files[$k]['download'] = api_get_path(WEB_CODE_PATH)."/document/document.php?cidReq=$cidReq&action=download&id=".urlencode($f['path']);
            $files[$k]['download'] = api_get_path(WEB_COURSE_PATH).$cidReq."/document".$f['path'];
        }
        print json_encode($files);
        exit;
    }
}