/// <summary>
/// Invoked whenever a 'Stream Initiation' request for file transfers
/// is received.
/// </summary>
/// <param name="from">The JID of the XMPP entity that wishes to initiate
/// the data-stream.</param>
/// <param name="si">The 'si' element of the request.</param>
/// <param name="result">The response to the SI request or an error element to include
/// in the IQ response.</param>
private void OnStreamInitiationRequest(Jid from, XmlElement si, Action <XmlElement> result)
{
try
{
string method = SelectStreamMethod(si["feature"]);
// If the session-id is already in use, we cannot process the request.
string sid = si.GetAttribute("id");
if (String.IsNullOrEmpty(sid) || siSessions.ContainsKey(sid))
{
result(new XmppError(ErrorType.Cancel, ErrorCondition.Conflict).Data);
}
// Extract file information and hand to user.
var file = si["file"];
string desc = file["desc"] != null ? file["desc"].InnerText : null,
name = file.GetAttribute("name");
int size = int.Parse(file.GetAttribute("size"));
FileTransfer transfer = new FileTransfer(from, im.Jid, name, size,
sid, desc);
TransferRequest.Invoke(transfer, (string savePath) =>
{
try
{
// User has rejected the request.
if (savePath == null)
{
result(new XmppError(ErrorType.Cancel, ErrorCondition.NotAcceptable).Data);
}
else
{
// Create an SI session instance.
SISession session = new SISession(sid, File.OpenWrite(savePath),
size, true, from, im.Jid, im.GetExtension(method) as IDataStream);
siSessions.TryAdd(sid, session);
// Store the file's meta data.
metaData.TryAdd(sid, new FileMetaData(name, desc));
// Construct and return the negotiation result.
result(Xml.Element("si", "http://jabber.org/protocol/si").Child(
FeatureNegotiation.Create(new SubmitForm(
new ListField("stream-method", method)))));
}
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Exception raised", e.ToString() + e.StackTrace);
result(new XmppError(ErrorType.Cancel, ErrorCondition.BadRequest).Data);
}
});
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("Exception raised", e.ToString() + e.StackTrace);
result(new XmppError(ErrorType.Cancel, ErrorCondition.BadRequest).Data);
}
}
