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Name File: download.php

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<?php
/*
  $Id: download.php 1739 2007-12-20 00:52:16Z hpdl $

  osCommerce, Open Source E-Commerce Solutions
  http://www.oscommerce.com

  Copyright (c) 2007 osCommerce

  Released under the GNU General Public License
*/

  include('includes/application_top.php');

  if (!tep_session_is_registered('customer_id')) die;

// Check download.php was called with proper GET parameters
  if ((isset($HTTP_GET_VARS['order']) && !is_numeric($HTTP_GET_VARS['order'])) || (isset($HTTP_GET_VARS['id']) && !is_numeric($HTTP_GET_VARS['id'])) ) {
    die;
  }
  
// Check that order_id, customer_id and filename match
  $downloads_query = tep_db_query("select date_format(o.date_purchased, '%Y-%m-%d') as date_purchased_day, opd.download_maxdays, opd.download_count, opd.download_maxdays, opd.orders_products_filename from " . TABLE_ORDERS . " o, " . TABLE_ORDERS_PRODUCTS . " op, " . TABLE_ORDERS_PRODUCTS_DOWNLOAD . " opd, " . TABLE_ORDERS_STATUS . " os where o.customers_id = '" . $customer_id . "' and o.orders_id = '" . (int)$HTTP_GET_VARS['order'] . "' and o.orders_id = op.orders_id and op.orders_products_id = opd.orders_products_id and opd.orders_products_download_id = '" . (int)$HTTP_GET_VARS['id'] . "' and opd.orders_products_filename != '' and o.orders_status = os.orders_status_id and os.downloads_flag = '1' and os.language_id = '" . (int)$languages_id . "'");
  if (!tep_db_num_rows($downloads_query)) die;
  $downloads = tep_db_fetch_array($downloads_query);
// MySQL 3.22 does not have INTERVAL
  list($dt_year, $dt_month, $dt_day) = explode('-', $downloads['date_purchased_day']);
  $download_timestamp = mktime(23, 59, 59, $dt_month, $dt_day + $downloads['download_maxdays'], $dt_year);

// Die if time expired (maxdays = 0 means no time limit)
  if (($downloads['download_maxdays'] != 0) && ($download_timestamp <= time())) die;
// Die if remaining count is <=0
  if ($downloads['download_count'] <= 0) die;
// Die if file is not there
  if (!file_exists(DIR_FS_DOWNLOAD . $downloads['orders_products_filename'])) die;
  
// Now decrement counter
  tep_db_query("update " . TABLE_ORDERS_PRODUCTS_DOWNLOAD . " set download_count = download_count-1 where orders_products_download_id = '" . (int)$HTTP_GET_VARS['id'] . "'");

// Returns a random name, 16 to 20 characters long
// There are more than 10^28 combinations
// The directory is "hidden", i.e. starts with '.'
function tep_random_name()
{
  $letters = 'abcdefghijklmnopqrstuvwxyz';
  $dirname = '.';
  $length = floor(tep_rand(16,20));
  for ($i = 1; $i <= $length; $i++) {
   $q = floor(tep_rand(1,26));
   $dirname .= $letters[$q];
  }
  return $dirname;
}

// Unlinks all subdirectories and files in $dir
// Works only on one subdir level, will not recurse
function tep_unlink_temp_dir($dir)
{
  $h1 = opendir($dir);
  while ($subdir = readdir($h1)) {
// Ignore non directories
    if (!is_dir($dir . $subdir)) continue;
// Ignore . and .. and CVS
    if ($subdir == '.' || $subdir == '..' || $subdir == 'CVS') continue;
// Loop and unlink files in subdirectory
    $h2 = opendir($dir . $subdir);
    while ($file = readdir($h2)) {
      if ($file == '.' || $file == '..') continue;
      @unlink($dir . $subdir . '/' . $file);
    }
    closedir($h2); 
    @rmdir($dir . $subdir);
  }
  closedir($h1);
}


// Now send the file with header() magic
  header("Expires: Mon, 26 Nov 1962 00:00:00 GMT");
  header("Last-Modified: " . gmdate("D,d M Y H:i:s") . " GMT");
  header("Cache-Control: no-cache, must-revalidate");
  header("Pragma: no-cache");
  header("Content-Type: Application/octet-stream");
  header("Content-disposition: attachment; filename=" . $downloads['orders_products_filename']);

  if (DOWNLOAD_BY_REDIRECT == 'true') {
// This will work only on Unix/Linux hosts
    tep_unlink_temp_dir(DIR_FS_DOWNLOAD_PUBLIC);
    $tempdir = tep_random_name();
    umask(0000);
    mkdir(DIR_FS_DOWNLOAD_PUBLIC . $tempdir, 0777);
    symlink(DIR_FS_DOWNLOAD . $downloads['orders_products_filename'], DIR_FS_DOWNLOAD_PUBLIC . $tempdir . '/' . $downloads['orders_products_filename']);
    if (file_exists(DIR_FS_DOWNLOAD_PUBLIC . $tempdir . '/' . $downloads['orders_products_filename'])) {
      tep_redirect(tep_href_link(DIR_WS_DOWNLOAD_PUBLIC . $tempdir . '/' . $downloads['orders_products_filename']));
    }
  }

// Fallback to readfile() delivery method. This will work on all systems, but will need considerable resources
  readfile(DIR_FS_DOWNLOAD . $downloads['orders_products_filename']);
?>