public MagnetLink(string url)
{
Check.Url(url);
AnnounceUrls = new RawTrackerTier();
Webseeds = new List <string> ();
ParseMagnetLink(url);
}
public MagnetLink(InfoHash infoHash, string name = null, IList <string> announceUrls = null, IEnumerable <string> webSeeds = null, long?size = null)
{
InfoHash = infoHash ?? throw new ArgumentNullException(nameof(infoHash));
Name = name;
AnnounceUrls = new RawTrackerTier(announceUrls ?? Array.Empty <string> ());
Webseeds = new List <string> (webSeeds ?? Array.Empty <string> ()).AsReadOnly();
Size = size;
}
protected void LoadInternal(BEncodedDictionary torrentInformation)
{
Check.TorrentInformation(torrentInformation);
originalDictionary = torrentInformation;
torrentPath = "";
try
{
foreach (KeyValuePair <BEncodedString, BEncodedValue> keypair in torrentInformation)
{
switch (keypair.Key.Text)
{
case ("announce"):
// Ignore this if we have an announce-list
if (torrentInformation.ContainsKey("announce-list"))
{
break;
}
announceUrls.Add(new RawTrackerTier());
announceUrls[0].Add(keypair.Value.ToString());
break;
case ("creation date"):
try
{
try
{
creationDate = creationDate.AddSeconds(long.Parse(keypair.Value.ToString()));
}
catch (Exception e)
{
if (e is ArgumentOutOfRangeException)
{
creationDate = creationDate.AddMilliseconds(long.Parse(keypair.Value.ToString()));
}
else
{
throw;
}
}
}
catch (Exception e)
{
if (e is ArgumentOutOfRangeException)
{
throw new BEncodingException("Argument out of range exception when adding seconds to creation date.", e);
}
else if (e is FormatException)
{
throw new BEncodingException(String.Format("Could not parse {0} into a number", keypair.Value), e);
}
else
{
throw;
}
}
break;
case ("nodes"):
nodes = (BEncodedList)keypair.Value;
break;
case ("comment.utf-8"):
if (keypair.Value.ToString().Length != 0)
{
comment = keypair.Value.ToString(); // Always take the UTF-8 version
}
break; // even if there's an existing value
case ("comment"):
if (String.IsNullOrEmpty(comment))
{
comment = keypair.Value.ToString();
}
break;
case ("publisher-url.utf-8"): // Always take the UTF-8 version
publisherUrl = keypair.Value.ToString(); // even if there's an existing value
break;
case ("publisher-url"):
if (String.IsNullOrEmpty(publisherUrl))
{
publisherUrl = keypair.Value.ToString();
}
break;
case ("azureus_properties"):
azureusProperties = keypair.Value;
break;
case ("created by"):
createdBy = keypair.Value.ToString();
break;
case ("encoding"):
encoding = keypair.Value.ToString();
break;
case ("info"):
using (SHA1 s = HashAlgoFactory.Create <SHA1>())
infoHash = new InfoHash(s.ComputeHash(keypair.Value.Encode()));
ProcessInfo(((BEncodedDictionary)keypair.Value));
break;
case ("name"): // Handled elsewhere
break;
case ("announce-list"):
if (keypair.Value is BEncodedString)
{
break;
}
BEncodedList announces = (BEncodedList)keypair.Value;
for (int j = 0; j < announces.Count; j++)
{
if (announces[j] is BEncodedList)
{
BEncodedList bencodedTier = (BEncodedList)announces[j];
List <string> tier = new List <string>(bencodedTier.Count);
for (int k = 0; k < bencodedTier.Count; k++)
{
tier.Add(bencodedTier[k].ToString());
}
Toolbox.Randomize <string>(tier);
RawTrackerTier collection = new RawTrackerTier();
for (int k = 0; k < tier.Count; k++)
{
collection.Add(tier[k]);
}
if (collection.Count != 0)
{
announceUrls.Add(collection);
}
}
else
{
throw new BEncodingException(String.Format("Non-BEncodedList found in announce-list (found {0})",
announces[j].GetType()));
}
}
break;
case ("httpseeds"):
// This form of web-seeding is not supported.
break;
case ("url-list"):
if (keypair.Value is BEncodedString)
{
getRightHttpSeeds.Add(((BEncodedString)keypair.Value).Text);
}
else if (keypair.Value is BEncodedList)
{
foreach (BEncodedString str in (BEncodedList)keypair.Value)
{
GetRightHttpSeeds.Add(str.Text);
}
}
break;
default:
break;
}
}
}
catch (Exception e)
{
if (e is BEncodingException)
{
throw;
}
else
{
throw new BEncodingException("", e);
}
}
}
/// <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)
{
InfoHash infoHash = null;
string name = null;
var announceUrls = new RawTrackerTier();
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)
{
throw new FormatException("A field-value pair of the magnet link contain more than one equal'.");
}
switch (keyval[0].Substring(0, 2))
{
case "xt": //exact topic
if (infoHash != null)
{
throw new FormatException("More than one infohash in magnet link is not allowed.");
}
string val = keyval[1].Substring(9);
switch (keyval[1].Substring(0, 9))
{
case "urn:sha1:": //base32 hash
case "urn:btih:":
if (val.Length == 32)
{
infoHash = InfoHash.FromBase32(val);
}
else if (val.Length == 40)
{
infoHash = InfoHash.FromHex(val);
}
else
{
throw new FormatException("Infohash must be base32 or hex encoded.");
}
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;
}
}
return(new MagnetLink(infoHash, name, announceUrls, webSeeds, size));
}
/// <summary>
/// 从给定的Uri解析磁铁链接. uri必须为[magnet:?xt=urn:btih:]开头的Uri对象
/// </summary>
/// <param name="uri">以[magnet:?xt=urn:btih:]开头的Uri对象</param>
/// <returns></returns>
public static MagnetLink FromUri(Uri uri)
{
InfoHash infoHash = null;
string name = null;
var announceUrls = new RawTrackerTier();
var webSeeds = new List <string> ();
long? size = null;
if (uri.Scheme != "magnet")
{
throw new FormatException("磁力链接必须为'magnet:'开头.");
}
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
if (infoHash != null)
{
throw new FormatException("磁铁链接中不允许有多个infohash.");
}
string val = keyval[1].Substring(9);
switch (keyval[1].Substring(0, 9))
{
case "urn:sha1:": //base32 hash
case "urn:btih:":
if (val.Length == 32)
{
infoHash = InfoHash.FromBase32(val);
}
else if (val.Length == 40)
{
infoHash = InfoHash.FromHex(val);
}
else
{
throw new FormatException("Infohash必须是Base32或十六进制编码.");
}
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 (infoHash == null)
{
throw new FormatException("磁铁链接不包含引用infohash的有效\"xt\"参数");
}
return(new MagnetLink(infoHash, name, announceUrls, webSeeds, size));
}
