private void ParseMagnetLink(string url)
{
var 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
var parameters = splitStr[1].Split('&', ';');
foreach (var keyval in parameters.Select(t => t.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.");
var val = keyval[1].Substring(9);
if (keyval[1].Substring(0, 9) == "urn:sha1:" || keyval[1].Substring(0, 9) == "urn:btih:")
{
switch (val.Length)
{
case 32:
InfoHash = InfoHash.FromBase32(val);
break;
case 40:
InfoHash = InfoHash.FromHex(val);
break;
default:
throw new FormatException("Infohash must be base32 or hex encoded.");
}
}
break;
case "tr": //address tracker
var bytes = UriHelper.UrlDecode(keyval[1]);
AnnounceUrls.Add(Encoding.UTF8.GetString(bytes));
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);
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;
}
}
}
}
