private void TabDynamic_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (tabControl.SelectedItem is ChatRoomView tab && tab.Name != null)
{
if (tab.Name.Equals("+"))
{
PopupDialog popup = new PopupDialog();
popup.ShowDialog();
string name;
if (popup.Canceled == true)
{
return;
}
else
{
string result = popup.RoomName;
name = result;
}
if (!(name.Equals("+") || name == string.Empty))
{
ChatRoomView newTab = new ChatRoomView(name);
Tabs.Insert(Tabs.Count - 1, newTab);
tabControl.ItemsSource = Tabs;
tabControl.SelectedItem = newTab;
BinaryWriter writer = new BinaryWriter(_sslStream);
writer.Write((int)Opcode.Join);
writer.Write(name);
writer.Flush();
}
}
}
}
/// <summary>
/// Updates the UI thread whenever the server sends a message or user status update.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BgCheck_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (_client.Connected)
{
/*listBox.ItemsSource = null;
* lock (_syncLock)
* {
* listBox.ItemsSource = users;
* }*/
// Update UI
if (e.Result is Tuple <string, string> )
{
// if it is not string, it assigns null
if (e.Result is Tuple <string, string> response)
{
ChatRoomView tab = Tabs.FirstOrDefault(i => i.Name == response.Item1);
if (tab != null)
{
lock (tab._syncLock2)
{
tab.Messages.Add(new Message(null, tab.Name, null, DateTime.Now, null, response.Item2, Brushes.Blue.ToString()));
}
}
}
}
else if (e.Result is Message)
{
if (e.Result is Message message)
{
Console.Write(message.Chatroom);
ChatRoomView tab = Tabs.FirstOrDefault(i => i.Name == message.Chatroom);
if (tab != null)
{
lock (tab._syncLock2)
{
tab.Messages.Add(message);
}
}
}
}
// Continue listening on server stream
_backgroundWorker.RunWorkerAsync();
}
else
{
// SEND TO ALL TABS
foreach (ChatRoomView tab in Tabs)
{
if (tab != null)
{
lock (tab._syncLock2)
{
tab.Messages.Add(new Message(null, tab.Name, null, DateTime.Now, null, "You have been disconnected from the server.", Brushes.Red.ToString()));
}
}
}
DropClient();
}
}
/// <summary>
/// Sends encrypted message to each user currently connected to the server.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
///
private void TextBox_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
if (e.Key == Key.Enter && Keyboard.Modifiers != ModifierKeys.Shift)
{
e.Handled = true;
//TabItem ti = (TabItem)tabControl.SelectedItem;
//var tab = Tabs.FirstOrDefault(i => i.Name == ti.Header.ToString());
Console.WriteLine("Click: ");
ChatRoomView tab = tabControl.SelectedItem as ChatRoomView;
Console.WriteLine("Click: " + tab.Name);
try
{
if (_client.Connected)
{
BinaryWriter writer = new BinaryWriter(_sslStream);
foreach (User user in tab.Users)
{
Console.WriteLine("Sending message to: " + user.UserName);
Message message = new Message(_currentUser.UserName, tab.Name, user, DateTime.UtcNow, null, tab.Message, ClrPcker_Background.SelectedColor.Value.ToString());
message.Encrypt();
byte[] encryptedMessage = Serialize(message);
int count = encryptedMessage.Count();
writer.Write((int)Opcode.SendMessage);
writer.Write(tab.Name); // add chat room
writer.Write(user.UserName);
writer.Write(count);
writer.Write(encryptedMessage);
writer.Flush();
}
tab.Messages.Add(new Message(_currentUser.UserName, tab.Name, null, DateTime.UtcNow, null, tab.Message, ClrPcker_Background.SelectedColor.Value.ToString()));
tab.Message = string.Empty;
// textBox.Clear();
}
}
catch (SocketException ex)
{
Console.WriteLine("SocketException: {0}", ex);
}
catch (Exception ex)
{
Console.WriteLine("Exception: {0}", ex);
tab.Messages.Add(new Message(null, tab.Name, null, DateTime.Now, null, "There was an exception in encrypting and sending the message. Make sure the private key is not corrupt or missing", Brushes.Red.ToString()));
}
}
}
/// <summary>
/// Listens for any communication from the server.
/// Three opcodes are used for communication from the server.
/// OpCode 1 - Update entire User list
/// OpCode 2 - Add/Remove single user
/// OpCode 3 - New Message
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ServerListener(object sender, DoWorkEventArgs e)
{
try
{
BinaryReader reader = new BinaryReader(_sslStream);
int OpCode = reader.ReadInt32();
Console.WriteLine("reading opcode: " + OpCode);
if (OpCode == (int)ServerOpcode.GetUsers)
{
Console.WriteLine("OPCODE 2 HAS BEEN ACCEPTED");
string userName = reader.ReadString();
string publicKey = reader.ReadString();
string chatRoom = reader.ReadString();
User user = new User(userName, publicKey);
Console.WriteLine("adding user: "******" to : " + chatRoom);
ChatRoomView tab = Tabs.FirstOrDefault(i => i.Name == chatRoom);
if (tab != null)
{
lock (tab._syncLock)
{
tab.Users.Add(user);
}
}
e.Result = null; //no message is passed on to UI
}
else if (OpCode == (int)ServerOpcode.UpdateUser)
{
Console.WriteLine("OPCODE 2 HAS BEEN ACCEPTED");
string userName = reader.ReadString(); //username of other client
string publicKey = reader.ReadString();
bool status = reader.ReadBoolean(); //connecting (true) or disconnecting (false)
string chatRoom = reader.ReadString();
string message = null;
User user = new User(userName, publicKey);
if (status)
{
ChatRoomView tab = Tabs.FirstOrDefault(i => i.Name == chatRoom);
if (tab != null)
{
lock (tab._syncLock)
{
Console.WriteLine("Adding " + user.UserName + " to " + chatRoom);
tab.Users.Add(user);
}
}
message = userName + " has joined the chat.";
}
else
{
ChatRoomView tab = Tabs.FirstOrDefault(i => i.Name == chatRoom);
if (tab != null)
{
List <User> usersCopy = new List <User>(tab.Users);
foreach (User item in usersCopy)
{
if (item.UserName == userName)
{
lock (tab._syncLock)
{
tab.Users.Remove(item);
}
}
}
}
message = userName + " has left the chat.";
}
e.Result = new Tuple <string, string>(chatRoom, message); //pass on message to UI
}
else if (OpCode == (int)ServerOpcode.UserMessage)
{
string chatRoom = reader.ReadString();
string username = reader.ReadString();
int count = reader.ReadInt32();
byte[] encryptedMessage = reader.ReadBytes(count);
Message message = (Message)Deserialize(encryptedMessage);
message.Decrypt();
//string decryptedMessage = RSADecrypt(encryptedMessage, privateKey);
//string message = username + ": " + decryptedMessage;
e.Result = message; //pass on message to UI
}
else if (OpCode == (int)ServerOpcode.SystemMessage) //System message
{
string chatRoom = reader.ReadString();
string message = reader.ReadString();
e.Result = new Tuple <string, string>(chatRoom, message); //pass on message to UI
}
}
catch (IOException ex)
{
Console.WriteLine("ServerListener IOException: " + ex);
}
catch (Exception ex)
{
Console.WriteLine("ServerListener exception: " + ex);
}
}
/// <summary>
/// Connects to the server and authenticates the user. If the user is authenticated, a background worker thread is created
/// to listen to any server communication. This is done in a background thread to free up the main UI thread, as to prevent freezing.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ButtonConnect_Click(object sender, RoutedEventArgs e)
{
/*
* TabItem ti = (TabItem)tabControl.SelectedItem;
* var tab = Tabs.FirstOrDefault(i => i.Name == ti.Header.ToString()); */
ChatRoomView tab = tabControl.SelectedItem as ChatRoomView;
try
{
tab.Messages.Add(new Message(null, tab.Name, null, DateTime.Now, "Connecting to Server...", "Connecting to Server...", Brushes.Blue.ToString()));
_serverIP = textBoxIP.Text;
_port = Convert.ToInt32(textBoxPort.Text);
_client = new TcpClient(); //causes the handle of the previous TcpClient to be lost
_client.Connect(_serverIP, _port);
var clientCertificateCollection = new X509CertificateCollection(new X509Certificate[] { new X509Certificate2(_clientCertificateFile, _clientCertificatePassword) });
//creates an SSL Stream that contains the TCP client socket as the underlying stream.
_sslStream = new SslStream(_client.GetStream(), false, App_CertificateValidation);
_sslStream.AuthenticateAsClient(_serverCertificateName, clientCertificateCollection, SslProtocols.Tls12, false);
tab.Messages.Add(new Message(null, tab.Name, null, DateTime.Now, null, "Authenticating User...", Brushes.Blue.ToString()));
// Send username and password to sever for authentication
var writer = new BinaryWriter(_sslStream);
writer.Write(textBoxUsername.Text);
writer.Write(passwordBox.Password);
writer.Write("Global"); // Chat group name sent
writer.Flush();
// Receieve response from server about authentication
var reader = new BinaryReader(_sslStream);
bool result = reader.ReadBoolean();
string response = reader.ReadString();
if (result == false)
{
tab.Messages.Add(new Message(null, tab.Name, null, DateTime.Now, null, response, Brushes.Red.ToString()));
_sslStream.Close();
writer.Close();
DropClient();
}
else
{
_currentUser = new User(textBoxUsername.Text, null);
_currentUser.PublicKey = GetOrGenerateKeyPair(_currentUser.UserName);
// send public key
writer.Write(_currentUser.PublicKey);
writer.Flush();
buttonDisconnect.IsEnabled = true;
buttonConnect.IsEnabled = false;
tab.Messages.Add(new Message(null, tab.Name, null, DateTime.Now, null, "Connected to Server: " + textBoxIP.Text, Brushes.Blue.ToString()));
_backgroundWorker = new BackgroundWorker();
Console.WriteLine("Starting background worker listener");
_backgroundWorker.DoWork += ServerListener;
_backgroundWorker.RunWorkerCompleted += BgCheck_RunWorkerCompleted;
_backgroundWorker.RunWorkerAsync();
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
DropClient();
}
}
