public static void RepeatToAllClientsInChannel <T>(List <T> list, ClientInstance instance)
{
// Get the index of the client initially sending the message.
// This is to get the channel ID from the user, and to only transmit to others with that channel ID.
int index = ServerMessage.FindClientKeysIndex(instance.client);
string json = Serialization.Serialize(list, false);
byte[] data = Serialization.AddEndCharToMessage(json);
for (int i = 0; i < ServerHandler.activeClients.Count; i++)
{
// Same channel check.
if (ServerHandler.activeClients[i].ChannelID == ServerHandler.activeClients[index].ChannelID)
{
byte[] encrypted = EncryptMessage(data, ServerHandler.activeClients[i].RSAModulus, ServerHandler.activeClients[i].RSAExponent);
// Try to send to [i] client, if the client does not exist anymore, remove from activeClients.
try
{
StreamHandler.WriteToStream(ServerHandler.activeClients[i].TCPClient.GetStream(), encrypted);
}
catch (ObjectDisposedException)
{
ServerHandler.activeClients.RemoveAt(i);
}
catch (InvalidOperationException)
{
ServerHandler.activeClients.RemoveAt(i);
}
}
}
}
public static void ClientPrivateMessage(ClientInstance instance, string parameters)
{
string[] args = parameters.Split(',');
for (int i = 0; i < ServerHandler.activeClients.Count; i++)
{
if (args[0] == ServerHandler.activeClients[i].ID.ToString() && !String.IsNullOrEmpty(args[1]))
{
// Get the index of the client sending the message.
int index = ServerMessage.FindClientKeysIndex(instance.client);
// Send the message to the reciever.
ServerMessage.ClientPrivateMessage(
ServerHandler.activeClients[i].TCPClient,
ConsoleColor.Yellow,
args[1],
ServerHandler.activeClients[index].ID,
ServerHandler.activeClients[index].Username
);
// Send a message to the sender to confirm the message has been sent.
ServerMessage.ServerClientMessage(instance.client, ConsoleColor.Yellow, "Message has been sent.");
}
}
}
public static void Serialize <T>(List <T> message, ClientInstance instance, bool encrypt)
{
string json = Serialization.Serialize(message, false);
byte[] data = Serialization.AddEndCharToMessage(json);
if (encrypt)
{
int index = ServerMessage.FindClientKeysIndex(instance.client);
data = EncryptMessage(data, ServerHandler.activeClients[index].RSAModulus, ServerHandler.activeClients[index].RSAExponent);
}
StreamHandler.WriteToStream(instance.stream, data);
}
public static void ClientRequestsChannelSwitch(ClientInstance instance, string parameters)
{
bool parse = int.TryParse(parameters, out int outNum);
int index = ServerMessage.FindClientKeysIndex(instance.client);
// If client has sent an invalid id.
if (!parse)
{
// Simply send back the users current channel id, which has not changed.
CommandHandler.ReplyToDataRequest(instance, ServerHandler.activeClients[index].ChannelID.ToString(), CommandDataTypes.CHANNELSWITCH);
return;
}
// Check if the client's requested new channel id actually exists.
bool foundID = false;
for (int i = 0; i < serverChannels.Count; i++)
{
if (serverChannels[i].ID == outNum)
{
foundID = true;
}
}
if (!foundID)
{
// Simply send back the users current channel id, which has not changed.
CommandHandler.ReplyToDataRequest(instance, ServerHandler.activeClients[index].ChannelID.ToString(), CommandDataTypes.CHANNELSWITCH);
return;
}
// Check if client is trying to switch to the channel they are currently in.
if (ServerHandler.activeClients[index].ChannelID == outNum)
{
// Simply send back the users current channel id, which has not changed.
CommandHandler.ReplyToDataRequest(instance, ServerHandler.activeClients[index].ChannelID.ToString(), CommandDataTypes.CHANNELSWITCH);
return;
}
ServerHandler.activeClients[index].ChannelID = outNum;
CommandHandler.ReplyToDataRequest(instance, outNum.ToString(), CommandDataTypes.CHANNELSWITCH);
string message = String.Format("({0}) {1} switched channel to: {2}", ServerHandler.activeClients[index].ID, ServerHandler.activeClients[index].Username, outNum.ToString());
ServerMessage.ServerGlobalMessage(ConsoleColor.Yellow, message);
}
public static void ReplyToDataRequest(ClientInstance instance, string message, CommandDataTypes dataType)
{
List <DataReplyFormat> serverMessage = new();
serverMessage.Add(new DataReplyFormat
{
MessageType = MessageTypes.DATAREPLY,
DataType = dataType,
Data = message,
});
string json = Serialization.Serialize(serverMessage, false);
byte[] data = Serialization.AddEndCharToMessage(json);
int index = ServerMessage.FindClientKeysIndex(instance.client);
byte[] encrypted = MessageHandler.EncryptMessage(data, ServerHandler.activeClients[index].RSAModulus, ServerHandler.activeClients[index].RSAExponent);
StreamHandler.WriteToStream(instance.stream, encrypted);
}
public static void VerifiedRecieve(ClientInstance instance, byte[] bytes)
{
// Random CryptographicException that i am not able to replicate
// TODO Investigate reason for exception.
string message = "";
try
{
message = Encryption.DecryptMessageData(bytes);
}
catch (CryptographicException)
{
int index = ServerMessage.FindClientKeysIndex(instance.client);
string serverMessage = String.Format("{0} Was kicked due to a cryptography error.", ServerHandler.activeClients[index].Username);
ServerMessage.ServerGlobalMessage(ConsoleColor.Yellow, serverMessage);
instance.client.Close();
}
string messageFormatted = Common.ReturnEndOfStream(message);
byte[] messageBytes = Encoding.ASCII.GetBytes(messageFormatted);
List <MessageFormat> messageList;
switch (Common.ReturnMessageType(messageBytes))
{
case MessageTypes.MESSAGE:
int index = ServerMessage.FindClientKeysIndex(instance.client);
// Error when deserializing message.
// Could mean corrupt or icorrect data has been transmitted.
try
{
messageList = Serialization.DeserializeMessageFormat(messageFormatted);
List <MessageReplyFormat> replyFormat = new();
replyFormat.Add(new MessageReplyFormat
{
MessageType = MessageTypes.MESSAGEREPLY,
Message = messageList[0].Message,
ID = ServerHandler.activeClients[index].ID,
Username = ServerHandler.activeClients[index].Username,
UsernameColor = ServerHandler.activeClients[index].UsernameColor,
});
ConsoleOutput.RecievedMessageReplyFormat(replyFormat, ServerHandler.activeClients[index].ChannelID);
// Encrypts the message and sends it to all clients.
RepeatToAllClientsInChannel(replyFormat, instance);
}
catch (JsonException)
{
string serverMessage = String.Format("({0}) {1} Was kicked due to an invalid message.", ServerHandler.activeClients[index].ID, ServerHandler.activeClients[index].Username);
ServerMessage.ServerGlobalMessage(ConsoleColor.Yellow, serverMessage);
instance.client.Close();
}
break;
case MessageTypes.DATAREQUEST:
List <DataRequestFormat> dataList = Serialization.DeserializeDataRequestFormat(messageFormatted);
CommandHandler.RecievedDataRequest(instance, dataList);
break;
}
}
