string ToString(int formatVersion)
{
var sb = new StringBuilder();
sb.Append("magnet:?");
if (formatVersion == 1)
{
sb.Append("xt=urn:btih:");
sb.Append(InfoHash.ToHex());
}
else if (formatVersion == 2)
{
sb.Append("xt=urn:btmh");
throw new NotSupportedException("Need to add support for the new 'multihash' thing");
}
else
{
throw new NotSupportedException();
}
if (!string.IsNullOrEmpty(Name))
{
sb.Append("&dn=");
sb.Append(Name.UrlEncodeUTF8());
}
foreach (var tracker in AnnounceUrls)
{
sb.Append("&tr=");
sb.Append(tracker.UrlEncodeUTF8());
}
foreach (var webseed in Webseeds)
{
sb.Append("&as=");
sb.Append(webseed.UrlEncodeUTF8());
}
return(sb.ToString());
}
void ParseMagnetLink(string url)
{
string[] splitStr = url.Split('?');
if (splitStr.Length == 0 || splitStr[0] != "magnet:")
{
throw new FormatException("The magnet link must start with 'magnet:?'.");
}
if (splitStr.Length == 1)
{
return;//no parametter
}
string[] parameters = splitStr[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
var bytes = UriHelper.UrlDecode(keyval[1]);
AnnounceUrls.Add(Encoding.UTF8.GetString(bytes, 0, bytes.Length));
break;
case "as": //Acceptable Source
Webseeds.Add(keyval[1]);
break;
case "dn": //display name
var name = UriHelper.UrlDecode(keyval[1]);
Name = Encoding.UTF8.GetString(name, 0, name.Length);
break;
case "xl": //exact length
case "xs": // eXact Source - P2P link.
case "kt": //keyword topic
case "mt": //manifest topic
//not supported for moment
break;
default:
//not supported
break;
}
}
}
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 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 (infoHash != null)
{
throw new FormatException("More than one infohash in magnet link is not allowed.");
}
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;
case "urn:btmh:":
// placeholder to parse v2 multihash
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("The magnet link did not contain a valid 'xt' parameter referencing the infohash");
}
return(new MagnetLink(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)
{
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
//not supported for moment
break;
default:
//not supported
break;
}
}
return(new MagnetLink(infoHash, name, announceUrls, webSeeds, size));
}
public void InvalidHex()
{
Assert.Throws <ArgumentException> (() => {
InfoHash.FromHex("123123123123123123123");
});
}
public void NullHex()
{
Assert.Throws <ArgumentNullException> (() => {
InfoHash.FromHex(null);
});
}
public PeersFoundEventArgs(InfoHash infoHash, List <Peer> peers)
{
this.peers = peers;
this.infoHash = infoHash;
}
public void InvalidBase32()
{
Assert.Throws <ArgumentException> (() => InfoHash.FromBase32("YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5"));
Assert.Throws <ArgumentException> (() => InfoHash.FromBase32("YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5?"));
}
public static InfoHashes FromV1(InfoHash infoHash) => new InfoHashes(infoHash, null);
public static InfoHashes FromV2(InfoHash infoHash) => new InfoHashes(null, infoHash);
void LoadInternal(BEncodedDictionary torrentInformation, InfoHash infoHash)
{
Check.TorrentInformation(torrentInformation);
AnnounceUrls = new List <IList <string> > ().AsReadOnly();
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 = new List <IList <string> > {
new List <string> {
keypair.Value.ToString()
}.AsReadOnly()
}.AsReadOnly();
break;
case ("creation date"):
try {
try {
CreationDate = UnixEpoch.AddSeconds(long.Parse(keypair.Value.ToString()));
} catch (Exception e) {
if (e is ArgumentOutOfRangeException)
{
CreationDate = UnixEpoch.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($"Could not parse {keypair.Value} into a number", e);
}
else
{
throw;
}
}
break;
case ("nodes"):
if (keypair.Value is BEncodedList list)
{
Nodes = list;
}
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 ("created by"):
CreatedBy = keypair.Value.ToString();
break;
case ("encoding"):
Encoding = keypair.Value.ToString();
break;
case ("info"):
InfoHash = infoHash;
ProcessInfo(((BEncodedDictionary)keypair.Value));
break;
case ("name"): // Handled elsewhere
break;
case ("announce-list"):
if (keypair.Value is BEncodedString)
{
break;
}
var result = new List <IList <string> > ();
var announces = (BEncodedList)keypair.Value;
for (int j = 0; j < announces.Count; j++)
{
if (announces[j] is BEncodedList bencodedTier)
{
var tier = new List <string> (bencodedTier.Count);
for (int k = 0; k < bencodedTier.Count; k++)
{
tier.Add(bencodedTier[k].ToString());
}
Toolbox.Randomize(tier);
var resultTier = new List <string> ();
for (int k = 0; k < tier.Count; k++)
{
resultTier.Add(tier[k]);
}
if (resultTier.Count != 0)
{
result.Add(tier.AsReadOnly());
}
}
else
{
throw new BEncodingException(
$"Non-BEncodedList found in announce-list (found {announces[j].GetType ()})");
}
}
if (result.Count > 0)
{
AnnounceUrls = result.AsReadOnly();
}
break;
case ("httpseeds"):
// This form of web-seeding is not supported.
break;
case ("url-list"):
if (keypair.Value is BEncodedString httpSeedString)
{
HttpSeeds.Add(httpSeedString.Text);
}
else if (keypair.Value is BEncodedList httpSeedList)
{
foreach (BEncodedString str in httpSeedList)
{
HttpSeeds.Add(str.Text);
}
}
break;
default:
break;
}
}
}
public override int GetHashCode() => InfoHash.GetHashCode();
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>
/// 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));
}
void ParseMagnetLink(string url)
{
string[] splitStr = url.Split('?');
if (splitStr.Length == 0 || splitStr[0] != "magnet:")
{
throw new FormatException("The magnet link must start with 'magnet:?'.");
}
if (splitStr.Length == 1)
{
return;//no parametter
}
string[] parameters = splitStr[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);
//TODO: Support more hash encoding scheme
//https://en.wikipedia.org/wiki/Magnet_URI_scheme#URN.2C_containing_hash_.28xt.29
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;
default:
throw new FormatException("Infohash must be base32 or hex encoded.");
}
break;
case "dn": //display name
Name = System.Web.HttpUtility.UrlDecode(keyval[1]);
break;
default:
//not supported
break;
}
}
}
