public static TestTorrentManagerInfo Create(
int?pieceLength = null,
long?size = null,
InfoHashes infoHashes = null,
string name = null,
IList <ITorrentFile> files = null)
{
return(Create <TestTorrentManagerInfo> (pieceLength, size, infoHashes, name, files));
}
public MagnetLink(InfoHashes infoHashes, string?name = null, IList <string>?announceUrls = null, IEnumerable <string>?webSeeds = null, long?size = null)
{
InfoHashes = infoHashes ?? throw new ArgumentNullException(nameof(infoHashes));
Name = name;
AnnounceUrls = new List <string> (announceUrls ?? Array.Empty <string> ()).AsReadOnly();
Webseeds = new List <string> (webSeeds ?? Array.Empty <string> ()).AsReadOnly();
Size = size;
}
public static T Create <T> (
int?pieceLength = null,
long?size = null,
InfoHashes infoHashes = null,
string name = null,
IList <ITorrentFile> files = null)
where T : TestTorrentManagerInfo, new ()
{
return(new T {
TorrentInfo = new TestTorrentInfo {
Files = files ?? Array.Empty <ITorrentFile> (),
Name = name ?? "name",
PieceLength = pieceLength ?? (4 * 16 * 1024),
Size = size ?? (4 * 16 * 1024) * 32,
InfoHashes = new InfoHashes(new InfoHash(new byte[20]), null)
}
});
}
public MagnetLink(InfoHash infoHash, string?name = null, IList <string>?announceUrls = null, IEnumerable <string>?webSeeds = null, long?size = null)
: this(InfoHashes.FromInfoHash(infoHash), name, announceUrls, webSeeds, size)
{
}
/// <summary>
/// Parses a magnet link from the given Uri. The uri should be in the form magnet:?xt=urn:btih:
/// </summary>
/// <param name="uri"></param>
/// <returns></returns>
public static MagnetLink FromUri(Uri uri)
{
InfoHashes?infoHashes = null;
string? name = null;
var announceUrls = new List <string> ();
var webSeeds = new List <string> ();
long? size = null;
if (uri.Scheme != "magnet")
{
throw new FormatException("Magnet links must start with 'magnet:'.");
}
string[] parameters = uri.Query.Substring(1).Split('&');
for (int i = 0; i < parameters.Length; i++)
{
string[] keyval = parameters[i].Split('=');
if (keyval.Length != 2)
{
// Skip anything we don't understand. Urls could theoretically contain many
// unknown parameters.
continue;
}
switch (keyval[0].Substring(0, 2))
{
case "xt": //exact topic
string val = keyval[1].Substring(9);
switch (keyval[1].Substring(0, 9))
{
case "urn:sha1:": //base32 hash
case "urn:btih:":
if (infoHashes?.V1 != null)
{
throw new FormatException("More than one v1 infohash in magnet link is not allowed.");
}
if (val.Length == 32)
{
infoHashes = new InfoHashes(InfoHash.FromBase32(val), infoHashes?.V2);
}
else if (val.Length == 40)
{
infoHashes = new InfoHashes(InfoHash.FromHex(val), infoHashes?.V2);
}
else
{
throw new FormatException("Infohash must be base32 or hex encoded.");
}
break;
case "urn:btmh:":
if (infoHashes?.V2 != null)
{
throw new FormatException("More than one v2 multihash in magnet link is not allowed.");
}
// BEP52: Support v2 magnet links
infoHashes = new InfoHashes(infoHashes?.V1, InfoHash.FromMultiHash(val));
break;
}
break;
case "tr": //address tracker
announceUrls.Add(keyval[1].UrlDecodeUTF8());
break;
case "as": //Acceptable Source
webSeeds.Add(keyval[1].UrlDecodeUTF8());
break;
case "dn": //display name
name = keyval[1].UrlDecodeUTF8();
break;
case "xl": //exact length
size = long.Parse(keyval[1]);
break;
//case "xs":// eXact Source - P2P link.
//case "kt"://keyword topic
//case "mt"://manifest topic
// Unused
//break;
default:
// Unknown/unsupported
break;
}
}
if (infoHashes == null)
{
throw new FormatException("The magnet link did not contain a valid 'xt' parameter referencing the infohash");
}
return(new MagnetLink(infoHashes, name, announceUrls, webSeeds, size));
}
