/**
* Builds tracker announce response in bencoded format
*
* @param Torrent $torrent
* @param PeerTorrent $peerTorrent
* @param $compact
* @param int $no_peer_id
* @return string
*/
public static function buildAnnounceResponse(Torrent $torrent, PeerTorrent $peerTorrent, $compact, $no_peer_id = 0)
{
// Compact mode
if ($compact != 1) {
$resp = "d" . self::bencodeString("interval") . "i" . self::__INTERVAL . "e" . self::bencodeString("peers") . "l";
} else {
$resp = "d" . self::bencodeString("interval") . "i" . self::__INTERVAL . "e" . self::bencodeString("min interval") . "i" . 300 . "e5:" . "peers";
}
$peer = array();
$peer_num = 0;
foreach ($torrent->getPeersArray() as $row) {
if ($compact != 1) {
if ($row["peer_id"] === $peerTorrent->peerInstance()->hash) {
continue;
}
$resp .= "d" . self::bencodeString("ip") . self::bencodeString($row['ip']);
if ($no_peer_id == 0) {
$resp .= self::bencodeString("peer id") . self::bencodeString($row["peer_id"]);
}
$resp .= self::bencodeString("port") . "i" . $row["port"] . "e" . "e";
} else {
$peer_ip = explode('.', $row["ip"]);
$peer_ip = pack("C*", $peer_ip[0], $peer_ip[1], $peer_ip[2], $peer_ip[3]);
$peer_port = pack("n*", (int) $row["port"]);
$time = intval(time() % 7680 / 60);
if ($peerTorrent->left == 0) {
$time += 128;
}
$time = pack("C", $time);
$peer[] = $time . $peer_ip . $peer_port;
$peer_num++;
}
}
if ($compact != 1) {
$resp .= "ee";
} else {
$o = "";
for ($i = 0; $i < $peer_num; $i++) {
$o .= substr($peer[$i], 1, 6);
}
$resp .= strlen($o) . ':' . $o . 'e';
}
return $resp;
}
