chamilo-lms/main/dropbox/dropbox_download.php

<?php
/* For licensing terms, see /license.txt */
/**
 * @package chamilo.dropbox
 */

// including the basic Chamilo initialisation file
require_once '../inc/global.inc.php';

// the dropbox configuration parameters
require_once 'dropbox_config.inc.php';

// the dropbox file that contains additional functions
require_once 'dropbox_functions.inc.php';

/*	DOWNLOAD A FOLDER */
$course_id = api_get_course_int_id();
$user_id = api_get_user_id();

if (isset($_GET['cat_id']) AND
    is_numeric($_GET['cat_id']) AND
    $_GET['action'] == 'downloadcategory' AND
    isset($_GET['sent_received'])
) {
    /** step 1: constructing the sql statement.
    Due to the nature off the classes of the dropbox the categories for sent files are stored in the table
    dropbox_file while the categories for the received files are stored in dropbox_post.
    It would have been more elegant if these could be stored in dropbox_person (which stores the link file-person)
    Therefore we have to create to separate sql statements to find which files are in the category
    (depending if we zip-download a sent category or a received category)*/

    if ($_GET['sent_received'] == 'sent') {
        // here we also incorporate the person table to make sure that deleted sent documents are not included.
        $sql = "SELECT DISTINCT file.id, file.filename, file.title
                FROM ".$dropbox_cnf['tbl_file']." file
                INNER JOIN ".$dropbox_cnf['tbl_person']." person
                ON (person.file_id=file.id AND file.c_id = $course_id AND person.c_id = $course_id)
                WHERE
                    file.uploader_id = $user_id AND
                    file.cat_id='".intval($_GET['cat_id'])."'  AND
                    person.user_id = $user_id";
    }

    if ($_GET['sent_received'] == 'received') {
        $sql = "SELECT DISTINCT file.id, file.filename, file.title
                FROM ".$dropbox_cnf['tbl_file']." file
                INNER JOIN ".$dropbox_cnf['tbl_person']." person
                ON (person.file_id=file.id AND file.c_id = $course_id AND person.c_id = $course_id)
                INNER JOIN ".$dropbox_cnf['tbl_post']." post
                ON (post.file_id = file.id AND post.c_id = $course_id AND file.c_id = $course_id)
                WHERE
                    post.cat_id = ".intval($_GET['cat_id'])." AND
                    post.dest_user_id = $user_id" ;
    }
    $files_to_download = array();
    $result = Database::query($sql);
    while ($row = Database::fetch_array($result)) {
        $files_to_download[] = $row['id'];
    }
    if (!is_array($files_to_download) OR empty($files_to_download)) {
        header('location: index.php?view='.Security::remove_XSS($_GET['sent_received']).'&error=ErrorNoFilesInFolder');
        exit;
    }
    zip_download($files_to_download);
    exit;
}
/*	DOWNLOAD A FILE */
/* AUTHORIZATION */

// Check if the id makes sense
if (!isset($_GET['id']) || !is_numeric($_GET['id'])) {
    Display::display_header($nameTools, 'Dropbox');
    Display :: display_error_message(get_lang('Error'));
    Display::display_footer();
    exit;
}

// Check if the user is allowed to download the file
$allowed_to_download = false;
if (user_can_download_file($_GET['id'], api_get_user_id())) {
    $allowed_to_download = true;
}

/*		ERROR IF NOT ALLOWED TO DOWNLOAD */

if (!$allowed_to_download) {
    Display::display_header($nameTools, 'Dropbox');
    Display::display_error_message(get_lang('YouAreNotAllowedToDownloadThisFile'));
    Display::display_footer();
	exit;
} else {
    /*      DOWNLOAD THE FILE */
    // the user is allowed to download the file
    $_SESSION['_seen'][$_course['id']][TOOL_DROPBOX][] = intval($_GET['id']);

    $work = new Dropbox_Work($_GET['id']);
    $path = dropbox_cnf('sysPath') . '/' . $work -> filename; //path to file as stored on server

    if (!Security::check_abs_path($path, dropbox_cnf('sysPath').'/')) {
        exit;
    }
    $file = $work->title;
    $mimetype = DocumentManager::file_get_mime_type(true);
    $fileinfo = pathinfo($file);
    $extension = $fileinfo['extension'];

    if (!empty($extension) && isset($mimetype[$extension]) && $_GET['action'] != 'download') {
        // give hint to browser about filetype
        header( 'Content-type: ' . $mimetype[$extension] . "\n");
    } else {
        //no information about filetype: force a download dialog window in browser
        header( "Content-type: application/octet-stream\n");
    }
    header('Content-Disposition: attachment; filename='.$file);

    /**
     * Note that if you use these two headers from a previous example:
     * header('Cache-Control: no-cache, must-revalidate');
     * header('Pragma: no-cache');
     * before sending a file to the browser, the "Open" option on Internet Explorer's file download dialog will not work properly. If the user clicks "Open" instead of "Save," the target application will open an empty file, because the downloaded file was not cached. The user will have to save the file to their hard drive in order to use it.
     * Make sure to leave these headers out if you'd like your visitors to be able to use IE's "Open" option.
     */
    header("Pragma: \n");
    header("Cache-Control: \n");
    header("Cache-Control: public\n"); // IE cannot download from sessions without a cache

    /*if (isset($_SERVER['HTTPS'])) {
        /**
         * We need to set the following headers to make downloads work using IE in HTTPS mode.
         *
        //header('Pragma: ');
        //header('Cache-Control: ');
        header("Expires: Mon, 26 Jul 1997 05:00:00 GMT\n");
        header("Last-Modified: " . gmdate( "D, d M Y H:i:s") . " GMT\n");
        header("Cache-Control: no-store, no-cache, must-revalidate\n"); // HTTP/1.1
        header("Cache-Control: post-check=0, pre-check=0\n", false);
    }*/

    header('Content-Description: '.trim(htmlentities($file)));
    header('Content-transfer-encoding: binary');

    header("Content-Length: " . filesize($path)."\n" );

    $fp = fopen( $path, 'rb');
    fpassthru($fp);
    exit();
}
//@todo clean this file the code below is useless there are 2 exits in previous conditions ... maybe a bad copy/paste/merge?
exit;