PHP模块，用于读取种子文件 [英] PHP Module for reading torrent files
问题描述
是否有一个PHP模块可用于以编程方式读取torrent来查找有关该种子的信息(例如，Seeders)?
Is there a PHP module that you can use to programmatically read a torrent to find out information about it, Seeders for instance?
推荐答案
我已经在一个曾经制作的小型网站中使用了这些功能.想想我是用一个名为OpenTracker的php bittorrent跟踪器找到它们的，但是找不到网站...
I have used these functions in a small website I made once. Think I found them with a php bittorrent tracker called OpenTracker or something, but can't find the website...
虽然您在torrent文件中找不到播种机.种子文件仅包含有关文件，哈希码和长度等的信息.还有一些我相信的跟踪器信息.您必须从跟踪器中获得多少个播种机等等.您可以在 BitTorrent.org 中了解该协议.我相信通信是经过编码的，因此您也可以使用这些功能.这意味着您只需要弄清楚要发送的内容就可以得到想要的东西.
You wont find the seeders in the torrent file though. The torrent file just contain info about the files, hash codes and lengths etc. And some tracker information I believe. How many seeders and such you will have to get from the tracker. You can read about the protocal at BitTorrent.org. The communication is, I believe, bencoded, so you can use these functions for that as well. Which means you just have to figure out what to send to get what you want back.
注意::我没有编写这三个函数.就像我说的，我是在一个开源洪流跟踪器的源代码中找到它们的.这些函数没有注释，但是在您知道种子文件的结果之后，函数名称和print_r一起就足以理解该如何使用它们.我在底部添加了一些示例代码以展示如何使用它们.他们工作了.
NOTE: I did not write these three functions. Like I said, I found them in the source of an open source torrent tracker. The functions are not commented, but the function names together with a print_r on the result of a torrent file you know the info inshould be enough to understand how to use them. I added some example code at the bottom to show how I used them. And they worked.
function bdecode($str) {
$pos = 0;
return bdecode_r($str, $pos);
}
function bdecode_r($str, &$pos) {
$strlen = strlen($str);
if (($pos < 0) || ($pos >= $strlen)) {
return null;
}
else if ($str{$pos} == 'i') {
$pos++;
$numlen = strspn($str, '-0123456789', $pos);
$spos = $pos;
$pos += $numlen;
if (($pos >= $strlen) || ($str{$pos} != 'e')) {
return null;
}
else {
$pos++;
return intval(substr($str, $spos, $numlen));
}
}
else if ($str{$pos} == 'd') {
$pos++;
$ret = array();
while ($pos < $strlen) {
if ($str{$pos} == 'e') {
$pos++;
return $ret;
}
else {
$key = bdecode_r($str, $pos);
if ($key == null) {
return null;
}
else {
$val = bdecode_r($str, $pos);
if ($val == null) {
return null;
}
else if (!is_array($key)) {
$ret[$key] = $val;
}
}
}
}
return null;
}
else if ($str{$pos} == 'l') {
$pos++;
$ret = array();
while ($pos < $strlen) {
if ($str{$pos} == 'e') {
$pos++;
return $ret;
}
else {
$val = bdecode_r($str, $pos);
if ($val == null) {
return null;
}
else {
$ret[] = $val;
}
}
}
return null;
}
else {
$numlen = strspn($str, '0123456789', $pos);
$spos = $pos;
$pos += $numlen;
if (($pos >= $strlen) || ($str{$pos} != ':')) {
return null;
}
else {
$vallen = intval(substr($str, $spos, $numlen));
$pos++;
$val = substr($str, $pos, $vallen);
if (strlen($val) != $vallen) {
return null;
}
else {
$pos += $vallen;
return $val;
}
}
}
}
function bencode($var) {
if (is_int($var)) {
return 'i' . $var . 'e';
}
else if (is_array($var)) {
if (count($var) == 0) {
return 'de';
}
else {
$assoc = false;
foreach ($var as $key => $val) {
if (!is_int($key)) {
$assoc = true;
break;
}
}
if ($assoc) {
ksort($var, SORT_REGULAR);
$ret = 'd';
foreach ($var as $key => $val) {
$ret .= bencode($key) . bencode($val);
}
return $ret . 'e';
}
else {
$ret = 'l';
foreach ($var as $val) {
$ret .= bencode($val);
}
return $ret . 'e';
}
}
}
else {
return strlen($var) . ':' . $var;
}
}
一些用法示例:
Some example usage:
# Read a file
$content = file_get_contents("file.torrent");
$content_d = bdecode($content);
# Check if bdecode succeeded
if(empty($content_d)) exit('Something is wrong with the torrent. BDecode failed.');
# Calculate info_hash
$info_hash = sha1(bencode($content_d['info']), true);
# Calculate length
$length = 0;
function add_length($value, $key)
{
global $length;
if($key == 'length') $length += $value;
}
array_walk_recursive($content_d, 'add_length');
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