public void JoinChat(string chatRoomName, string UserName)
{
if (!String.IsNullOrEmpty(UserName) && LoginUsers.Any(x => x.DisplayUserName == UserName))
{
if (!ChatingUsers.Any(x => x.DisplayUserName == UserName && x.ChatRoomName == chatRoomName))
{
ChatUser currentUser = new ChatUser {
ChatUserName = Context.User.Identity.Name, ChatRoomName = chatRoomName, DisplayUserName = UserName
};
ChatUser reciver = ChatingUsers.Find(x => x.ChatUserName != Context.User.Identity.Name && x.ChatRoomName == chatRoomName);
if (reciver != null)
{
// Ako postoji sugovornik u grupi uzmi javni ključ i napravi novi dervirani ključ
currentUser.SetDeriveKey(reciver.PublicKey);
// Ako sugovornik ima već ključ za potpisivanje uzmi i stavi za ključ za potpisivanje trenutnog korisnika
// Ako nema napravi novi ključ i postavi ga
if (reciver.KeyForSigning != null)
{
currentUser.KeyForSigning = reciver.KeyForSigning;
}
else
{
currentUser.SetKeyForSigning(Guid.NewGuid().ToString());
reciver.KeyForSigning = currentUser.KeyForSigning;
}
// Ako sugovornik nema dervirani ključ postavi ga koristeči javni ključ trenutnog korisnika
if (reciver.CurrentDeriveKey == null)
{
reciver.SetDeriveKey(currentUser.PublicKey);
ChatingUsers[ChatingUsers.IndexOf(reciver)] = reciver;
}
}
else
{
// Ako sugovornik još nema napravi novi ključ za potpisivanje
currentUser.SetKeyForSigning(Guid.NewGuid().ToString());
}
ChatingUsers.Add(currentUser);
Groups.Add(Context.ConnectionId, chatRoomName);
}
else
{
ChatUser currentUser = ChatingUsers.Find(x => x.DisplayUserName == UserName && x.ChatRoomName == chatRoomName);
ChatingUsers.Find(x => x.DisplayUserName == UserName && x.ChatRoomName == chatRoomName).ChatUserName = Context.User.Identity.Name;
if (currentUser.CurrentDeriveKey == null)
{
ChatUser reciver = ChatingUsers.Find(x => x.ChatUserName != Context.User.Identity.Name && x.ChatRoomName == chatRoomName);
if (reciver != null)
{
ChatingUsers.Find(x => x.DisplayUserName == UserName && x.ChatRoomName == chatRoomName).SetDeriveKey(reciver.PublicKey);
}
}
}
}
GetListOfUsersInRoom(chatRoomName);
}
public void NewsDeriveKey(string chatRoomName)
{
ChatUser Bob = ChatingUsers.Find(x => x.ChatUserName == Context.User.Identity.Name);
ChatUser Alice = ChatingUsers.Find(x => x.ChatUserName != Context.User.Identity.Name && x.ChatRoomName == chatRoomName);
Clients.Group(chatRoomName).blockChat();
Alice.GenerateNewKey();
Bob.GenerateNewKey(Alice.PublicKey);
Alice.SetDeriveKey(Bob.PublicKey);
Alice.PreviousDeriveKey = null;
Bob.PreviousDeriveKey = null;
ChatingUsers[ChatingUsers.IndexOf(Alice)] = Alice;
ChatingUsers[ChatingUsers.IndexOf(Bob)] = Bob;
Clients.Group(chatRoomName).allowChat();
}