private static PeerInfo[] DecodePeers(BEncoding.List peerList)
{
var peerInfoList = new List <PeerInfo>(peerList.Count);
foreach (var peer in peerList)
{
if (peer is BEncoding.Dictionary)
{
var peerDict = (peer as BEncoding.Dictionary);
byte[] peerIDBytes;
if (!peerDict.TryGetByteArray("peer id", out peerIDBytes) && !peerDict.TryGetByteArray("peer_id", out peerIDBytes))
{
peerIDBytes = null;
}
string peerIP;
long peerPort;
if (peerDict.TryGetString("ip", out peerIP) && peerDict.TryGetInteger("port", out peerPort) && peerPort > 0 && peerPort <= ushort.MaxValue)
{
IPAddress ipAddress;
if (IPAddress.TryParse(peerIP, out ipAddress))
{
var endPoint = new IPEndPoint(ipAddress, (int)peerPort);
if (peerIDBytes != null && peerIDBytes.Length == 20)
{
var peerID = new PeerID(peerIDBytes);
peerInfoList.Add(new PeerInfo(peerID, endPoint));
}
else
{
peerInfoList.Add(new PeerInfo(endPoint));
}
}
else
{
Log.LogError("[HTTP Tracker] Unable to parse peer IP: {0}", peerIP);
}
}
}
else if (peer is byte[])
{
var peerBytes = peer as byte[];
var decodedPeers = DecodePeers(peerBytes);
if (decodedPeers != null)
{
peerInfoList.AddRange(decodedPeers);
}
else
{
Log.LogError("[HTTP Tracker] Unable to decode peer information from {0} bytes of compact data.", peerBytes.Length);
}
}
else
{
Log.LogError("[HTTP Tracker] Unable decode get peer information with invalid BEncode type: {0}", (peer != null ? peer.GetType().Name : "<null>"));
}
}
return(peerInfoList.ToArray());
}
private BEncoding.Dictionary Save()
{
var torrentInfo = new BEncoding.Dictionary();
// Make sure that there is a piece size
if (pieceSize == 0)
{
throw new InvalidOperationException("No piece size has been set yet.");
}
else if (!MathHelper.IsPowerOfTwo(pieceSize))
{
throw new InvalidOperationException("The piece size must be a power of two.");
}
else if (files == null || files.Length == 0)
{
throw new InvalidOperationException("No files have been defined yet.");
}
else if (totalSize == 0L)
{
throw new InvalidOperationException("The total size of the torrent cannot be 0.");
}
int pieceCount = (int)((totalSize - 1) / pieceSize) + 1;
if (pieceCount != pieceHashes.Length)
{
throw new InvalidOperationException(string.Format("The calculated number of pieces is {0} while there are {1} piece hashes.", pieceCount, pieceHashes.Length));
}
if (announces != null && announces.Length > 0)
{
if (!string.IsNullOrEmpty(announces[0].Url))
{
torrentInfo.Add("announce", announces[0].Url);
}
var trackerList = new BEncoding.List();
for (int i = 0; i < announces.Length; i++)
{
var urls = announces[i].Urls;
if (urls == null || urls.Length == 0)
{
continue;
}
var urlList = new BEncoding.List();
for (int j = 0; j < urls.Length; j++)
{
if (!string.IsNullOrEmpty(urls[j]))
{
urlList.Add(urls[j]);
}
}
if (urlList.Count > 0)
{
trackerList.Add(urlList);
}
}
if (trackerList.Count > 0)
{
torrentInfo.Add("announce-list", trackerList);
}
}
if (!string.IsNullOrEmpty(comment))
{
torrentInfo.Add("comment", comment);
}
if (!string.IsNullOrEmpty(createdBy))
{
torrentInfo.Add("created by", createdBy);
}
if (creationDate != DateTime.MinValue)
{
long creationDateTimestamp = TimeHelper.GetUnixTimestampFromDate(creationDate);
torrentInfo.Add("creation date", creationDateTimestamp);
}
// Get the piece hash data
byte[] pieceHashData = new byte[20 * pieceCount];
for (int i = 0; i < pieceCount; i++)
{
Buffer.BlockCopy(pieceHashes[i].Hash, 0, pieceHashData, (i * 20), 20);
}
var info = new BEncoding.Dictionary();
info.Add("piece length", pieceSize);
info.Add("pieces", pieceHashData);
info.Add("private", (isPrivate ? 1 : 0));
if (!string.IsNullOrEmpty(source))
{
info.Add("source", source);
}
if (files != null)
{
if (files.Length == 1)
{
var fileItem = files[0];
info.Add("length", fileItem.Size);
if (fileItem.MD5Hash != null && fileItem.MD5Hash.Length == 16)
{
string fileMD5HashHex = HexHelper.BytesToHex(fileItem.MD5Hash);
info.Add("md5sum", fileMD5HashHex);
}
info.Add("name", GetFileName(fileItem.Path));
}
else if (files.Length > 1)
{
info.Add("name", name ?? "Unnamed");
var fileList = new BEncoding.List();
for (int i = 0; i < files.Length; i++)
{
var fileItem = files[i];
var fileDictionary = new BEncoding.Dictionary();
fileDictionary.Add("length", fileItem.Size);
if (fileItem.MD5Hash != null && fileItem.MD5Hash.Length == 16)
{
string fileMD5HashHex = HexHelper.BytesToHex(fileItem.MD5Hash);
info.Add("md5sum", fileMD5HashHex);
}
string[] pathParts = fileItem.Path.Split(new char[] { '/' });
var pathList = new BEncoding.List(pathParts);
fileDictionary.Add("path", pathList);
fileList.Add(fileDictionary);
}
info.Add("files", fileList);
}
}
infoHash = ComputeInfoHash(info);
torrentInfo.Add("info", info);
return(torrentInfo);
}
