private ScrapeResponse HandleScrapeResponse(BEncoding.Dictionary info)
{
BEncoding.Dictionary files;
if (!info.TryGetDictionary("files", out files))
{
return(null);
}
var torrentInfos = new List <ScrapeResponse.TorrentInfo>(files.Count);
foreach (var torrentInfo in files)
{
var torrentInfoDict = (torrentInfo.Value as BEncoding.Dictionary);
if (torrentInfoDict == null)
{
continue;
}
long completeCount, incompleteCount, downloadedCount;
string torrentName;
if (!torrentInfoDict.TryGetInteger("complete", out completeCount))
{
completeCount = 0;
}
if (!torrentInfoDict.TryGetInteger("incomplete", out incompleteCount))
{
incompleteCount = 0;
}
if (!torrentInfoDict.TryGetInteger("downloaded", out downloadedCount))
{
downloadedCount = 0;
}
if (!torrentInfoDict.TryGetString("name", out torrentName))
{
torrentName = null;
}
byte[] infoHashBytes = Encoding.UTF8.GetBytes(torrentInfo.Key); // TODO: Is this okay to do?
var infoHash = new InfoHash(infoHashBytes);
torrentInfos.Add(new ScrapeResponse.TorrentInfo(infoHash, (int)completeCount, (int)incompleteCount, (int)downloadedCount, torrentName));
}
return(new ScrapeResponse(this, torrentInfos.ToArray()));
}
private void Load(BEncoding.Dictionary torrentInfo)
{
ClearInfo();
BEncoding.List announceList;
if (torrentInfo.TryGetList("announce-list", out announceList))
{
int announceCount = announceList.Count;
var newAnnounceList = new List <AnnounceItem>(announceCount);
for (int i = 0; i < announceCount; i++)
{
var urlList = (announceList[i] as BEncoding.List);
if (urlList != null)
{
int urlCount = urlList.Count;
var newUrlList = new List <string>(urlCount);
for (int j = 0; j < urlCount; j++)
{
string url = urlList.GetString(j);
if (!string.IsNullOrEmpty(url))
{
newUrlList.Add(url);
}
}
if (newUrlList.Count > 0)
{
newAnnounceList.Add(new AnnounceItem(newUrlList.ToArray()));
}
}
}
announces = newAnnounceList.ToArray();
}
else
{
string announceUrl;
if (torrentInfo.TryGetString("announce", out announceUrl))
{
announces = new AnnounceItem[]
{
new AnnounceItem(announceUrl)
};
}
}
long creationDateTimestamp;
if (!torrentInfo.TryGetString("comment", out comment))
{
comment = null;
}
if (!torrentInfo.TryGetString("created by", out createdBy))
{
createdBy = null;
}
if (torrentInfo.TryGetInteger("creation date", out creationDateTimestamp))
{
creationDate = TimeHelper.GetDateFromUnixTimestamp(creationDateTimestamp);
}
else
{
creationDate = DateTime.MinValue;
}
BEncoding.Dictionary info;
if (!torrentInfo.TryGetDictionary("info", out info))
{
throw new InvalidDataException("The info dictionary is missing in the torrent meta-data.");
}
infoHash = ComputeInfoHash(info);
long pieceSize;
if (!info.TryGetInteger("piece length", out pieceSize))
{
throw new InvalidDataException("The piece length is missing in the torrent meta-data. But it is required for all torrents.");
}
byte[] pieceHashData;
if (!info.TryGetByteArray("pieces", out pieceHashData))
{
throw new InvalidDataException("The piece hashes are missing in the torrent meta-data. But it is required for all torrents.");
}
else if ((pieceHashData.Length % 20) != 0)
{
throw new InvalidDataException("The piece hashes are invalid in the torrent meta-data. It must be a multiple of 20 (for SHA1 hashes).");
}
int pieceCount = (pieceHashData.Length / 20);
pieceHashes = new PieceHash[pieceCount];
for (int i = 0; i < pieceCount; i++)
{
byte[] pieceHashBytes = new byte[20];
Buffer.BlockCopy(pieceHashData, (i * 20), pieceHashBytes, 0, 20);
pieceHashes[i] = new PieceHash(pieceHashBytes);
}
long isPrivate;
if (info.TryGetInteger("private", out isPrivate) && isPrivate == 1)
{
this.isPrivate = true;
}
if (!info.TryGetString("source", out source))
{
source = null;
}
if (!info.TryGetString("name", out name) || string.IsNullOrEmpty(name))
{
throw new InvalidDataException("The name string is missing in the torrent meta-data. But it is required for all torrents.");
}
this.pieceSize = (int)pieceSize;
BEncoding.List fileList;
if (info.TryGetList("files", out fileList))
{
int fileCount = fileList.Count;
files = new FileItem[fileCount];
for (int i = 0; i < fileCount; i++)
{
var fileItem = fileList[i] as BEncoding.Dictionary;
if (fileItem == null)
{
throw new InvalidDataException("The format of the torrent meta-data is invalid. Expected a dictionary of file information.");
}
long fileSize;
if (!fileItem.TryGetInteger("length", out fileSize))
{
throw new InvalidDataException("The format of the torrent meta-data is invalid. Expected a file size.");
}
string fileMD5HashHex;
byte[] fileMD5Hash = null;
if (fileItem.TryGetString("md5sum", out fileMD5HashHex) && fileMD5HashHex.Length == 32)
{
fileMD5Hash = HexHelper.HexToBytes(fileMD5HashHex);
}
BEncoding.List pathList;
if (!fileItem.TryGetList("path", out pathList))
{
throw new InvalidDataException("The format of the torrent meta-data is invalid. Expected a file path.");
}
int pathPartCount = pathList.Count;
string[] pathParts = new string[pathPartCount];
for (int j = 0; j < pathPartCount; j++)
{
string pathPart = pathList.GetString(j);
if (string.IsNullOrEmpty(pathPart))
{
throw new InvalidDataException("The format of the torrent meta-data is invalid. Expected a file path.");
}
pathParts[j] = pathPart;
}
string filePath = string.Join("/", pathParts);
files[i] = new FileItem(filePath, fileSize, fileMD5Hash);
}
}
else
{
long fileSize;
if (!info.TryGetInteger("length", out fileSize))
{
throw new InvalidDataException("The file length is missing in the torrent meta-data. But it is required for single-file torrents.");
}
string fileMD5HashHex;
byte[] fileMD5Hash = null;
if (info.TryGetString("md5sum", out fileMD5HashHex) && fileMD5HashHex.Length == 32)
{
fileMD5Hash = HexHelper.HexToBytes(fileMD5HashHex);
}
files = new FileItem[]
{
new FileItem(name, fileSize, fileMD5Hash)
};
}
totalSize = ComputeTotalSize();
int expectedPieceCount = (int)((totalSize - 1) / pieceSize) + 1;
if (expectedPieceCount != pieceHashes.Length)
{
throw new InvalidOperationException(string.Format("The calculated number of pieces is {0} while there are {1} piece hashes.", expectedPieceCount, pieceHashes.Length));
}
}