/// <summary>
/// Accept a new user, search a free user name and inform the other users
/// </summary>
/// <param name="socket"></param>
/// <param name="socketId"></param>
/// <returns></returns>
private async Task AcceptNewUser(WebSocket socket, string socketId)
{
ChatPartner newChatPartner = new ChatPartner()
{
WebSocket = socket,
};
lock (_sockets)
{
newChatPartner.Nickname = GetFreeNickname("anonymous");
newChatPartner.Identifier = socketId;
_sockets.TryAdd(socketId, newChatPartner);
}
_globalRoom.ConnectedUsers.Add(newChatPartner.Identifier);
UserJoinMessage joinMessage = new UserJoinMessage()
{
SenderGuid = socketId,
IsOriginOfMessage = false,
ChatUser = newChatPartner
};
await InformUsersAboutJoin(joinMessage, _globalRoom);
}
/// <summary>
/// Inform all users about a joining user
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
private async Task InformUsersAboutJoin(UserJoinMessage message, ChatRoom targetRoom)
{
//send the joining user his user name and all other users that he joined the server
await Task.WhenAll(targetRoom.ConnectedUsers.Select(userKey =>
{
if (_sockets.TryGetValue(userKey, out ChatPartner user))
{
message.IsOriginOfMessage = user.Identifier == message.SenderGuid;
string serialized = JsonConvert.SerializeObject(message, Global.SerializerSettings);
return(SendStringAsync(user.WebSocket, user.Identifier, serialized, CancellationToken.None));
}
return(Task.CompletedTask);
}).ToArray());
}
/// <summary>
/// Handles the room join request of a user and adds him to the room if the password is correct
/// </summary>
/// <param name="joinRequest"></param>
/// <returns></returns>
private async Task HandleRoomJoinRequest(RoomJoinRequest joinRequest)
{
//send the user the result of his request (helper method to avoid duplicate code9
async Task sendRequestResult(bool success)
{
//send the user a message back that the password was wrong
if (_sockets.TryGetValue(joinRequest.SenderGuid, out ChatPartner user))
{
joinRequest.IsSuccessful = success;
string serialized = JsonConvert.SerializeObject(joinRequest, Global.SerializerSettings);
await SendStringAsync(user.WebSocket, user.Identifier, serialized, CancellationToken.None);
}
}
//check if the room exists and if the correct password is supplied (if the room is password protected)
if (_chatrooms.TryGetValue(joinRequest.RoomIdentifier, out ChatRoom joinRoom))
{
if ((!joinRoom.IsPasswordProtected || joinRoom.Password == joinRequest.Password) &&
!joinRoom.ConnectedUsers.Contains(joinRequest.SenderGuid))
{
joinRoom.ConnectedUsers.Add(joinRequest.SenderGuid);
var joinMessage = new UserJoinMessage()
{
SenderGuid = joinRequest.SenderGuid,
RoomIdentifier = joinRequest.RoomIdentifier,
Timestamp = DateTime.Now
};
await sendRequestResult(true);
await InformUsersAboutJoin(joinMessage, joinRoom);
}
else
{
await sendRequestResult(false);
}
}
}
