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<?php
/**
@author Nguyen Quoc Bao <quocbao.coder@gmail.com>
@version 1.3
@desc A simple object for processing download operation , support section downloading
Please send me an email if you find some bug or it doesn't work with download manager.
I've tested it with
- Reget
- FDM
- FlashGet
- GetRight
- DAP
@copyright It's free as long as you keep this header .
@example
1: File Download
$object = new JDownloader;
$object->set_byfile($filename); //Download from a file
$object->use_resume = true; //Enable Resume Mode
$object->use_autoexit = true;
$object->set_mime($mime); //File MIME (Default: application/otect-stream)
$object->set_speed($speed);
$object->download(); //Download File
2: Data Download
$object = new JDownloader;
$object->set_bydata($data); //Download from php data
$object->use_resume = true; //Enable Resume Mode
$object->set_filename($filename); //Set download name
$object->set_mime($mime); //File MIME (Default: application/otect-stream)
$object->download(); //Download File
3: Manual Download
$object = new JDownloader;
$object->set_filename($filename);
$object->download_ex($size);
//output your data here , remember to use $this->seek_start and $this->seek_end value :)
Modified for jDownloads by Arno Betz
**/
namespace JDownloads\Component\JDownloads\Site\Helper;
\defined('_JEXEC') or die;
setlocale(LC_ALL, 'C.UTF-8', 'C');
class JDownloader {
var $data = null;
var $data_len = 0;
var $data_mod = 0;
var $data_type = 0;
var $data_section = 0; //section download
/**
* @var ObjectHandler
**/
var $handler = array('auth' => null);
var $use_resume = true;
var $use_autoexit = false;
var $use_ssl = false;
var $use_auth = false;
var $filename = null;
var $mime = null;
var $bufsize = 2048;
var $seek_start = 0;
var $seek_end = -1;
var $open_in_browser = false;
var $refresh_time = null;
var $refresh_url = null;
/**
* Total bandwidth has been used for this download
* @var int
*/
var $bandwidth = 0;
/**
* Speed limit
* @var float
*/
var $speed = 0;
/*-------------------
| Download Function |
-------------------*/
/**
* Check authentication and get seek position
* @return bool
**/
function initialize() {
global $HTTP_SERVER_VARS;
if ($this->use_auth) {
// Use authentication
if (!$this->_auth()){
// No authentication
header('WWW-Authenticate: Basic realm="Please enter your username and password"');
header('HTTP/1.0 401 Unauthorized');
header('status: 401 Unauthorized');
if ($this->use_autoexit) exit();
return false;
}
}
// Default mime
if ($this->mime == null) $this->mime = "application/octet-stream";
if (isset($_SERVER['HTTP_RANGE']) || isset($HTTP_SERVER_VARS['HTTP_RANGE'])){
if (isset($HTTP_SERVER_VARS['HTTP_RANGE'])) $seek_range = substr($HTTP_SERVER_VARS['HTTP_RANGE'] , strlen('bytes='));
else $seek_range = substr($_SERVER['HTTP_RANGE'] , strlen('bytes='));
$range = explode('-',$seek_range);
if ($range[0] > 0){
$this->seek_start = intval($range[0]);
}
if ($range[1] > 0) $this->seek_end = intval($range[1]);
else $this->seek_end = -1;
if (!$this->use_resume){
$this->seek_start = 0;
//header("HTTP/1.0 404 Bad Request");
//header("Status: 400 Bad Request");
//exit;
//return false;
} else {
$this->data_section = 1;
}
} else {
$this->seek_start = 0;
$this->seek_end = -1;
}
return true;
}
/**
* Send download information header
**/
function header($size, $seek_start=null, $seek_end=null) {
if ($this->use_ssl){
header('Cache-Control: private, max-age=0, must-revalidate, no-store');
}
header('Content-type: ' . $this->mime);
if ($this->open_in_browser){
header('Content-Disposition: inline; filename="' . $this->filename . '"');
} else {
header('Content-Disposition: attachment; filename="' . $this->filename . '"');
}
header('Last-Modified: ' . date('D, d M Y H:i:s \G\M\T' , $this->data_mod));
if ($this->data_section && $this->use_resume){
header("HTTP/1.0 206 Partial Content");
header("Status: 206 Partial Content");
header('Accept-Ranges: bytes');
header("Content-Range: bytes $seek_start-$seek_end/$size");
header("Content-Length: " . ($seek_end - $seek_start + 1));
} else {
header("Content-Length: $size");
}
if ($this->refresh_time !== null){
header("refresh:$this->refresh_time; url=$this->refresh_url");
}
}
function download_ex($size)
{
if (!$this->initialize()) return false;
if (function_exists('ignore_user_abort')){
ignore_user_abort(true);
}
//Use seek end here
if ($this->seek_start > ($size - 1)) $this->seek_start = 0;
if ($this->seek_end <= 0) $this->seek_end = $size - 1;
$this->header($size, $seek, $this->seek_end);
$this->data_mod = time();
return true;
}
/**
* Start download
* @return bool
**/
function download() {
if (!$this->initialize()) return false;
$seek = $this->seek_start;
$speed = $this->speed;
$bufsize = $this->bufsize;
$packet = 1;
// Do clean up the output buffer
while (ob_get_level() > 0)
@ob_end_clean();
if (function_exists('ignore_user_abort')) {
$old_status = ignore_user_abort(true);
} else {
$old_status = null;
}
if (!ini_get('safe_mode')){
@set_time_limit(0);
}
$this->bandwidth = 0;
$size = $this->data_len;
if ($this->data_type == 0){
// Download from a file
// $size = filesize($this->data);
if ($seek > ($size - 1)) $seek = 0;
if ($this->filename == null) $this->filename = basename($this->data);
$res = fopen($this->data,'rb');
if ($seek) fseek($res , $seek);
if ($this->seek_end < $seek) $this->seek_end = $size - 1;
$this->header($size,$seek,$this->seek_end); //always use the last seek
$size = $this->seek_end - $seek + 1;
while (!(connection_aborted() || connection_status() == 1) && $size > 0){
if ($size < $bufsize){
echo fread($res, $size);
$this->bandwidth += $size;
} else {
echo fread($res, $bufsize);
$this->bandwidth += $bufsize;
}
$size -= $bufsize;
flush();
if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024)){
sleep(1);
$packet++;
}
}
fclose($res);
} elseif ($this->data_type == 1){
// Download from a string
if ($seek > ($size - 1)) $seek = 0;
if ($this->seek_end < $seek) $this->seek_end = $this->data_len - 1;
$this->data = substr($this->data, $seek, $this->seek_end - $seek + 1);
if ($this->filename == null) $this->filename = time();
$size = strlen($this->data);
$this->header($this->data_len, $seek, $this->seek_end);
while (!connection_aborted() && $size > 0){
if ($size < $bufsize){
$this->bandwidth += $size;
} else {
$this->bandwidth += $bufsize;
}
echo substr($this->data, 0, $bufsize);
$this->data = substr($this->data, $bufsize);
$size -= $bufsize;
flush();
if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024)){
sleep(1);
$packet++;
}
}
} else if ($this->data_type == 2){
// Just send a redirect header
header('location: ' . $this->data);
}
if ($this->use_autoexit) exit();
// Restore old status
if (function_exists('ignore_user_abort')) {
ignore_user_abort($old_status);
}
if (!ini_get('safe_mode')) {
@set_time_limit(ini_get("max_execution_time"));
}
return true;
}
function set_byfile($dir) {
$this->data_len = 0;
$this->data = $dir;
$this->data_type = 0;
$this->data_mod = filemtime($dir);
return true;
}
function set_bydata($data) {
if ($data == '') return false;
$this->data = $data;
$this->data_len = strlen($data);
$this->data_type = 1;
$this->data_mod = time();
return true;
}
function set_byurl($data) {
$this->data = $data;
$this->data_len = 0;
$this->data_type = 2;
return true;
}
function set_filename($filename) {
$this->filename = $filename;
}
function set_filesize($filesize) {
$this->data_len = $filesize;
}
function set_refresh($url, $time) {
if ($time > 0){
$this->refresh_url = $url;
$this->refresh_time = $time;
}
}
function set_mime($mime) {
$this->mime = $mime;
}
function set_speed($speed) {
$this->speed = $speed;
}
function set_lastmodtime($time) {
$time = intval($time);
if ($time <= 0) $time = time();
$this->data_mod = $time;
}
/**
* Check authentication
* @return bool
**/
function _auth() {
if (!isset($_SERVER['PHP_AUTH_USER'])) return false;
if (isset($this->handler['auth']) && function_exists($this->handler['auth'])){
return $this->handler['auth']('auth' , $_SERVER['PHP_AUTH_USER'],$_SERVER['PHP_AUTH_PW']);
} else {
// You must use a handler
return true;
}
}
}
?>