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;
}
}
}
/// <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 InvalidBase32()
{
Assert.Throws <ArgumentException> (() => InfoHash.FromBase32("YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5"));
Assert.Throws <ArgumentException> (() => InfoHash.FromBase32("YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5?"));
}
/// <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;
}
}
}