private bool IsIdValid(Message message)
{
if (message.Id <= 0)
throw new ArgumentException("Message Id should be positive");
return true;
}
public int AddMessage(Message message)
{
if (!IsMessageValid(message)) return -1;
else if(!IsIdValid(message)) return -1;
return Model.AddMessage(message);
}
private bool IsDateValid(Message message)
{
if (message.Date == null)
message.Date = DateTime.Now;
if(message.Date.)
return true;
}
public void Notify(Messages.Message message)
{
string json = JsonConvert.SerializeObject(message);
Console.WriteLine($"sending message to topic {_topic}");
var dr = _producer.ProduceAsync(_topic, null, json).Result;
Console.WriteLine("message sent");
}
public int AddMessage(Message message)
{
var index = messages.FindIndex(msg => msg.Id == message.Id);
if (index >= 0)
{
message.Id = messages.Max(msg => msg.Id) + 1;
}
messages.Add(message);
return message.Id;
}
public static byte[] GetSerializedMessage(Message message)
{
BinaryFormatter bFormatter = new BinaryFormatter();
using (MemoryStream stream = new MemoryStream())
{
bFormatter.Serialize(stream, message);
byte[] buffer = stream.ToArray();
//int count = await stream.ReadAsync(buffer, 0, buffer.Length);
return buffer;
}
}
protected void AddMessage_Click(object sender, EventArgs e)
{
MessagesEntities context = new MessagesEntities();
Message newMessage = new Message()
{
Text = this.NewMessage.Text
};
context.Messages.Add(newMessage);
context.SaveChanges();
this.NewMessage.Text = "";
}
public void getlogs()
{
LogRequest objlogRequest = new LogRequest();
objlogRequest.author = "Karthik";
objlogRequest.TestRequestName = "TestRequest1";
Messages.Message logMessage = new Messages.Message();
logMessage.author = "karu";
logMessage.body = objlogRequest.ToXml();
logMessage.to = Comm <Client> .makeEndPoint(url, repoPort);
logMessage.from = Comm <Client> .makeEndPoint(url, clientPort);
logMessage.type = "LogRequest";
logMessage.time = DateTime.Now;
objComm.sndr.PostMessage(logMessage);
}
private bool IsMessageValid(Message message)
{
if (message.Text == null)
{
throw new ArgumentNullException("message", "message.Text should not be null");
}
if (message.Text.Length <= 0)
{
throw new ArgumentOutOfRangeException("message", "message text should not be empty");
}
if (message.Text.Length > 20)
{
throw new ArgumentOutOfRangeException("message", "message text length should not be > 20");
}
return true;
}
/// <summary>
/// metoda sluzaca do wyslania prosby o klucz danego uzytkownika do serwera
/// </summary>
private void GetAesKey()
{
var selected = (User)onlineUsersListBox.SelectedItem;
var writer = new BinaryWriter(client.GetStream());
var start = new Messages.Message(user.Username, "server", selected.Username, SignString(selected.Username));
var startEncrypted = Security.EncryptMessage(start, serverPK.ExportParameters(false));
writer.Write(startEncrypted);
}
/// <summary>
/// metoda sluzaca do wyslania wiadomosci do drugiego uzytkownika
/// </summary>
private void SendMessage()
{
if (!string.IsNullOrEmpty(MessageInputTextBox.Text))
{
var selected = (User)onlineUsersListBox.SelectedItem;
var writer = new BinaryWriter(client.GetStream());
var aes = GetAes(selected.Username);
var message = new Messages.Message(user.Username, selected.Username, MessageInputTextBox.Text, SignString(MessageInputTextBox.Text));
var encryptedMessage = Security.EncryptMessage(message, serverPK.ExportParameters(false), aes.Key, aes.IV);
var text = string.Format("{0} You wrote: {1} ", DateTime.Now.ToString(), MessageInputTextBox.Text);
AddOrUpdateDictionary(selected.Username, text);
messengerRichTextBox.ChangeText(text, true);
MessageInputTextBox.Text = string.Empty;
writer.Write(encryptedMessage);
}
}
// Получить пакет.
public byte[] Encrypt(Message m)
{
int type = -1;
if (m is Inform_of_Down_Message)
{
type = 0;
}
if (m is Inform_of_Rec_Message)
{
type = 1;
}
if (m is ListMessage)
{
type = 2;
}
if (m is RequestMessage)
{
type = 3;
}
if (m is FilePartMessage)
{
type = 4;
}
if (m is EndMessage)
{
type = 5;
}
if (m is ResponseMessage)
{
type = 6;
}
if (m is ErrorMessage)
{
type = 7;
}
if (m is HubInformMessage)
{
type = 8;
}
// Буффер для передачи данных.
byte[] bytes = new byte[1024];
// Вспомогательная строка для составления пакета.
string assis = string.Empty;
// Формирование пакета.
assis += type.ToString();
assis += m.Get_Data();
// Кодировка пакета.
bytes = Encoding.ASCII.GetBytes(assis);
return bytes;
}
// Раскрыть пакет.
public Message Decrypt(byte[] b)
{
// Возвращаемое значение.
Message mes;
// Строка, полученная из полученного массива байт.
string str = Encoding.ASCII.GetString(b);
// Тип сообщений.
if (str[0] != '\0')
{
int type = int.Parse(str[0].ToString());
int border = str.IndexOf('\0');
if (border==(-1))
{
border = str.Length;
}
if (type != -1)
{
// Строка данных.
string assis = str.Substring(1, border - 1);
// Определение типа сообщения.
switch (type)
{
case 0:
mes = new Inform_of_Down_Message(assis);
break;
case 1:
mes = new Inform_of_Rec_Message(assis);
break;
case 2:
mes = new ListMessage(assis);
break;
case 3:
mes = new RequestMessage(assis);
break;
case 4:
mes = new FilePartMessage(assis);
break;
case 5:
mes = new EndMessage(assis);
break;
case 6:
mes = new ResponseMessage(assis);
break;
case 7:
mes = new ErrorMessage(assis);
break;
case 8:
mes = new HubInformMessage(assis);
break;
default:
mes = new Message(assis);
break;
}
}
else
mes = new Message(string.Empty);
return mes;
}
else
return new Message(string.Empty);
}
public void Change_Data(string s, Message m)
{
m.Set_Data(s);
}
static void HandleTextMessage(Message textMessage)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Got message: {0}", textMessage.Text);
Console.ResetColor();
}
public Chat(Model.Contact i)
{
hilo = new Thread(new ThreadStart(up));
contact = i;
viewModel = new Message(i);
hilo.Start();
DataContext = viewModel;
InitializeComponent();
ScrollViewer Scr = (ScrollViewer)scroll;
Scr.ScrollToEnd();
Title = i.userName;
}
/// <summary>
/// metoda do szyfrowania wiadomosci algorytmen AES
/// </summary>
/// <param name="message">wiadomosc do zaszyfrowania</param>
/// <param name="rsaKeyInfo">klucze RSA</param>
/// <param name="aesKey">klucz tajny AES</param>
/// <param name="aesIV">wektor inicjalizacji</param>
/// <returns>zserializowana i zaszyfrowana wiadomosc</returns>
public static string EncryptMessage(Message message, RSAParameters rsaKeyInfo, byte[] aesKey, byte[] aesIV)
{
var converter = new UnicodeEncoding();
var sender = converter.GetBytes(message.Sender);
var receiver = converter.GetBytes(message.Receiver);
string encryptedSender = Convert.ToBase64String(RSAEncrypt(sender, rsaKeyInfo, false));
string encryptedReceiver = Convert.ToBase64String(RSAEncrypt(receiver, rsaKeyInfo, false));
string encryptedData = Convert.ToBase64String(AESEncrypt(message.data, aesKey, aesIV));
return MessageSerializer.Serialize(new Message(encryptedSender, encryptedReceiver, encryptedData, message.Signature), typeof(Message));
}
/// <summary>
/// metoda do deszyfrowania wiadomosci algorytmen AES
/// </summary>
/// <param name="message">wiadomosc do odszyfrowania</param>
/// <param name="rsaKeyInfo">klucze RSA</param>
/// <param name="aesKey">klucz tajny AES</param>
/// <param name="aesIV">wektor inicjalizacji</param>
/// <returns>zserializowana i odszyfrowana wiadomosc</returns>
public static string DecryptMessage(Message message, RSAParameters rsaKeyInfo, byte[] aesKey, byte[] aesIV)
{
var converter = new UnicodeEncoding();
var encryptedSender = Convert.FromBase64String(message.Sender);
var encryptedReceiver = Convert.FromBase64String(message.Receiver);
string decryptedSender = converter.GetString(RSADecrypt(encryptedSender, rsaKeyInfo, false));
string decryptedReceiver = converter.GetString(RSADecrypt(encryptedReceiver, rsaKeyInfo, false));
string decryptedData = AESDecrypt(Convert.FromBase64String(message.data), aesKey, aesIV);
return MessageSerializer.Serialize(new Message(decryptedSender, decryptedReceiver, decryptedData, message.Signature), typeof(Message));
}
