public void SendMessageToKnownServer(string message)
{
try
{
if (string.IsNullOrEmpty(message))
{
return;
}
ChatPacket packet = new ChatPacket();
packet.Message = message;
if (string.IsNullOrEmpty(nickname))
{
packet.PacketType = PACKET_TYPE.SETUP;
packet.Nickname = string.Empty;
}
else
{
packet.PacketType = PACKET_TYPE.TEXT;
packet.Nickname = nickname;
}
string jsonPacket = JsonConvert.SerializeObject(packet);
var bytesToSend = Encoding.UTF8.GetBytes(jsonPacket);
SocketAsyncEventArgs args = new SocketAsyncEventArgs();
args.SetBuffer(bytesToSend, 0, bytesToSend.Length);
args.RemoteEndPoint = mChatServerEP;
args.UserToken = packet;
args.Completed += SendMessageToKnownServerCompleted;
mBroadcastSender.SendToAsync(args);
}
catch (Exception e)
{
OnRaisePrintStringEvent(new PrintStringEventArgs($"Error: {e.ToString()}"));
throw;
}
}
private void ReceiveCompletedCallback(object sender, SocketAsyncEventArgs e)
{
string textReceived = Encoding.UTF8.GetString(e.Buffer, 0, e.BytesTransferred);
ChatPacket packet = JsonConvert.DeserializeObject <ChatPacket>(textReceived);
packet.Message = packet.Message.Trim();
if (packet.PacketType == PACKET_TYPE.DISCOVERY && packet.Message.Equals("<DISCOVER>"))
{
if (!mListOfClients.ContainsValue(e.RemoteEndPoint))
{
mListOfClients.Add(e.RemoteEndPoint.ToString(), e.RemoteEndPoint);
OnRaisePrintStringEvent(new PrintStringEventArgs($"New client connected: {e.RemoteEndPoint.ToString()}"));
ChatPacket confirmationPacket = new ChatPacket();
confirmationPacket.Message = "Inform your nickname";
confirmationPacket.PacketType = PACKET_TYPE.CONFIRMATION;
confirmationPacket.Nickname = "Server";
SendTextToEndPoint(JsonConvert.SerializeObject(confirmationPacket), e.RemoteEndPoint);
}
}
else if (packet.PacketType == PACKET_TYPE.SETUP)
{
string choosenNickname = packet.Message;
if (mListOfClients.ContainsKey(choosenNickname))
{
packet.Message = "The choosen nickname already exists. Please choose another one";
packet.PacketType = PACKET_TYPE.SETUP_ERROR;
SendTextToEndPoint(JsonConvert.SerializeObject(packet), e.RemoteEndPoint);
}
else
{
mListOfClients.Remove(e.RemoteEndPoint.ToString());
mListOfClients.Add(choosenNickname, e.RemoteEndPoint);
packet.Message = "Welcome to the chat";
packet.PacketType = PACKET_TYPE.SETUP_CONFIRMATION;
packet.Nickname = choosenNickname;
SendTextToEndPoint(JsonConvert.SerializeObject(packet), e.RemoteEndPoint);
}
}
else if (packet.PacketType == PACKET_TYPE.TEXT)
{
if (packet.Message.StartsWith("/help"))
{
packet.Nickname = "Server";
packet.Message = $"To send a message to someone start the message with a @ followed by the nickname (e.g.: @paulo Oi){Environment.NewLine}To send a private message to someone start the message with a # followed by the nickname (e.g.: #paulo essa mensagem é só pra você){Environment.NewLine}";
SendTextToEndPoint(JsonConvert.SerializeObject(packet), e.RemoteEndPoint);
}
else if (packet.Message.StartsWith("@"))
{
string targetNick = packet.Message.Substring(0, packet.Message.IndexOf(' ')).Replace("@", "");
if (mListOfClients.ContainsKey(targetNick))
{
packet.Nickname += $" says to {targetNick}";
packet.Message = packet.Message.Remove(0, packet.Message.IndexOf(' '));
SendToAll(JsonConvert.SerializeObject(packet));
}
else
{
packet.Nickname = "Server";
packet.Message = "User not found on this room";
SendTextToEndPoint(JsonConvert.SerializeObject(packet), e.RemoteEndPoint);
}
}
else if (packet.Message.Trim().StartsWith("#"))
{
string targetNick = packet.Message.Substring(0, packet.Message.IndexOf(' ')).Replace("#", "");
if (mListOfClients.ContainsKey(targetNick))
{
packet.Nickname += $" privately says to {targetNick}";
packet.Message = packet.Message.Remove(0, packet.Message.IndexOf(' '));
SendTextToEndPoint(JsonConvert.SerializeObject(packet), e.RemoteEndPoint);
SendTextToEndPoint(JsonConvert.SerializeObject(packet), mListOfClients[targetNick]);
}
else
{
packet.Nickname = "Server";
packet.Message = "User not found on this room";
SendTextToEndPoint(JsonConvert.SerializeObject(packet), e.RemoteEndPoint);
}
}
else
{
SendToAll(textReceived);
}
}
StartReceivingData();
}
