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;
}
}
}
public static InfoHash UrlDecode(string infoHash)
{
Check.InfoHash(infoHash);
return(new InfoHash(UriHelper.UrlDecode(infoHash)));
}
public static InfoHash UrlDecode(string infoHash)
{
infoHash = infoHash ?? throw new ArgumentNullException(nameof(infoHash));
return(new InfoHash(UriHelper.UrlDecode(infoHash)));
}
public static string UrlDecodeUTF8(this string str)
{
return(UTF8.GetString(UriHelper.UrlDecode(str)));
}
public static string UrlDecodeUTF8(this string str) => UTF8.GetString(UriHelper.UrlDecode(str));