// Private methods
private async Task HandleMessage(string message)
{
WsClient[] clientSockets = WsManager.GetClientsByUser(this.UserId);
if (clientSockets == null || clientSockets.Length < 1)
{
return;
}
var sockets = clientSockets.Select(c => c.Socket).ToArray();
await BroadcastMessage(message, sockets);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseWebSockets(new WebSocketOptions()
{
KeepAliveInterval = TimeSpan.FromSeconds(120),
ReceiveBufferSize = 4 * 1024
});
app.UseMiddleware <SimpleWsMiddleware>();
app.UseFileServer();
int cleanUpRate = 3; // sec
Task.Run(() => WsManager.CheckExpired(cleanUpRate));
}
public async Task Invoke(HttpContext context)
{
// If not WebSockets request - ignore this and go to next middleware
if (!context.WebSockets.IsWebSocketRequest)
{
await _next.Invoke(context);
return;
}
// Establishing WebSocket connection
CancellationToken ct = context.RequestAborted;
WebSocket currentSocket = await context.WebSockets.AcceptWebSocketAsync();
if (currentSocket == null || currentSocket.State != WebSocketState.Open)
{
return;
}
// Getting token from which determine a user/owner
string userIdCookie;
string tokenCookie;
DateTime expirationTime;
try
{
userIdCookie = context.Request.Query[COOKIE_USER_KEY].ToString();
tokenCookie = context.Request.Query[COOKIE_TOKEN_KEY].ToString();
expirationTime = new JwtSecurityTokenHandler().ReadJwtToken(tokenCookie).ValidTo;
}
catch (Exception)
{
await currentSocket.CloseAsync(
WebSocketCloseStatus.PolicyViolation, "Wrong cookies or damaged JWT.", default(CancellationToken));
return;
}
if (expirationTime < DateTime.UtcNow)
{
await currentSocket.CloseAsync(
WebSocketCloseStatus.PolicyViolation, "JWT expired.", default(CancellationToken));
return;
}
if (!TokenIsValid(userIdCookie, tokenCookie))
{
await currentSocket.CloseAsync(
WebSocketCloseStatus.PolicyViolation, "Not authorized.", default(CancellationToken));
return;
}
WsClient wsClient = new WsClient(currentSocket, userIdCookie, expirationTime);
// Adding socket to Manager and subscribing for new messages.
try
{
WsManager.AddClient(wsClient);
await wsClient.Listen(ct);
}
catch (Exception ex)
{
// TODO: Cleanup - remove socket if Aborted
Console.WriteLine(ex.Message);
WsManager.RemoveClient(wsClient);
}
}
