/*
* Commands are received asynchronously. OnReceive is the handler for them.
*/
private void OnReceive(IAsyncResult ar)
{
try
{
EndPoint receivedFromEP = new IPEndPoint(IPAddress.Any, 0);
//Get the IP from where we got a message.
clientSocket.EndReceiveFrom(ar, ref receivedFromEP);
//Convert the bytes received into an object of type Data.
Data msgReceived = new Data(byteData);
//Act according to the received message.
switch (msgReceived.cmdCommand)
{
//We have an incoming call.
case Command.Invite:
{
if (IsCallActive == false)
{
//We have no active call.
//Ask the user to accept the call or not.
if (MessageBox.Show("Call coming from " + msgReceived.strName + ".\r\n\r\nAccept it?",
"VoiceChat", MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.Yes) == MessageBoxResult.Yes)
{
//Get someones crypto information
var cryptoTuple = UserRepo.fetchUsersCrypto(msgReceived.strName);
CallCurrentPass = cryptoTuple.Item1;
CallCurrentSalt = cryptoTuple.Item2;
SendMessage(Command.OK, receivedFromEP);
otherPartyEP = receivedFromEP;
otherPartyIP = (IPEndPoint)receivedFromEP;
InitializeCall();
}
else
{
//The call is declined. Send a busy response.
SendMessage(Command.Busy, receivedFromEP);
}
}
else
{
//We already have an existing call. Send a busy response.
SendMessage(Command.Busy, receivedFromEP);
}
break;
}
//OK is received in response to an Invite.
case Command.OK:
{
//Start a call.
InitializeCall();
MessageBox.Show("Person has answered. Call started.", "Call handler", MessageBoxButton.OK, MessageBoxImage.Information, MessageBoxResult.OK);
break;
}
//Remote party is busy.
case Command.Busy:
{
MessageBox.Show("User busy.", "VoiceChat", MessageBoxButton.OK, MessageBoxImage.Exclamation, MessageBoxResult.OK);
CallRepo.createCall(Globals.currentUserId, ReceiverID, CallDate.ToString("yyyy-MM-dd hh:mm:ss"), 5);
IsCaller = false;
window.ButtonSetAsync(true, false, false);
//Reinitialize crypto properties after the call
MyCurrentPass = AES_Crypto.CreatePass();
MyCurrentSalt = AES_Crypto.CreateSalt();
CallCurrentPass = null;
CallCurrentSalt = null;
UserRepo.updateCrypto(MyCurrentPass, MyCurrentSalt);
break;
}
case Command.Bye:
{
//Check if the Bye command has indeed come from the user/IP with which we have
//a call established. This is used to prevent other users from sending a Bye, which
//would otherwise end the call.
if (receivedFromEP.Equals(otherPartyEP) == true)
{
//End the call.
UninitializeCall();
}
MessageBox.Show("Person has disconnected", "Call handler", MessageBoxButton.OK, MessageBoxImage.Information, MessageBoxResult.OK);
break;
}
}
byteData = new byte[1024];
//Get ready to receive more commands.
clientSocket.BeginReceiveFrom(byteData, 0, byteData.Length, SocketFlags.None, ref receivedFromEP, new AsyncCallback(OnReceive), null);
}
catch (Exception e)
{
MessageBox.Show(e.Message, "VoiceChat-OnReceive ()", MessageBoxButton.OK, MessageBoxImage.Error, MessageBoxResult.OK);
}
}