void WebSocketOpen(string[] args)
{
// new websocket connection with conntionID, uri, and optional UTF16 arguments
try
{
int connectionID = Int32.Parse(args[2]);
string uriDecoded = Encoding.Unicode.GetString(Convert.FromBase64String(args[3]));
Uri webUri;
try
{
webUri = new Uri(uriDecoded);
}
catch (UriFormatException e)
{
Console.WriteLine("URI incorrectly formatted: " + e.Message);
Console.WriteLine("Closing websocket connection " + connectionID);
midiManager.SendWebSocketClosedResponse(connectionID);
return;
}
bool autoConvertResponse = false;
if (args.Length > 4)
{
autoConvertResponse = args[4] == "UTF16";
}
Console.WriteLine("Opening websocket (" + connectionID + "): " + uriDecoded);
webManager.OpenWebSocketConnection(connectionID, webUri, autoConvertResponse);
}
catch (Exception e)
{
Console.WriteLine("Error parsing web request: " + e.Message);
}
}
public async void OpenWebSocketConnection(int connectionID, Uri webUri, bool autoConvertResponses)
{
// Block all non-internet IP address
if (HostnameIsPrivateIPAddress(webUri))
{
Console.WriteLine("Closing websocket connection " + connectionID);
midiManager.SendWebSocketClosedResponse(connectionID);
return;
}
if (webUri.Scheme != "ws" && webUri.Scheme != "wss")
{
Console.WriteLine("Error: World attempted to open unsupported URI: " + webUri.Scheme);
Console.WriteLine("Closing websocket connection " + connectionID);
midiManager.SendWebSocketClosedResponse(connectionID);
return;
}
// Block all rate limited domain+path combos
var hostAndPath = new HostnameAndPath(webUri.Host, "");
if (rateLimitedURIs.ContainsKey(hostAndPath))
{
if (DateTime.Now < rateLimitedURIs[hostAndPath])
{
Console.WriteLine("ERROR: Could not open websocket connection, currently rate limited.");
Console.WriteLine("Closing websocket connection " + connectionID);
midiManager.SendWebSocketClosedResponse(connectionID);
return;
}
else
{
rateLimitedURIs.Remove(hostAndPath);
}
}
webSockets[connectionID] = new ClientWebSocket();
ClientWebSocket cws = webSockets[connectionID];
try
{
await cws.ConnectAsync(webUri, ctSource.Token);
}
catch (WebSocketException e)
{
rateLimitedURIs.Add(hostAndPath, DateTime.Now.AddSeconds(RATE_LIMIT_TIMEOUT_SECONDS));
Console.WriteLine("Failed to open websocket: " + e.Message);
Console.WriteLine("Closing websocket connection " + connectionID);
midiManager.SendWebSocketClosedResponse(connectionID);
webSockets[connectionID] = null;
return;
}
catch (OperationCanceledException)
{
return;
}
while (cws.State == WebSocketState.Connecting)
{
;
}
if (cws.State == WebSocketState.Open)
{
midiManager.SendWebSocketOpenedResponse(connectionID);
}
wsBuffers[connectionID] = new ArraySegment <byte>(new byte[WEBSOCKET_BUFFER_SIZE]);
wsAutoConvertMessages[connectionID] = autoConvertResponses;
while (cws.State == WebSocketState.Open)
{
WebSocketReceiveResult wssr = null;
try
{
wssr = await cws.ReceiveAsync(wsBuffers[connectionID], ctSource.Token);
}
catch (WebSocketException e)
{
// Aborted state. To or to not rate limit, because twitch likes to
// abort any connection when a nickname is already taken...
Console.WriteLine("WebSocketException: " + e.Message);
Console.WriteLine("Closing websocket connection " + connectionID);
midiManager.SendWebSocketClosedResponse(connectionID);
webSockets[connectionID] = null;
break;
}
catch (OperationCanceledException)
{
break;
}
catch (Exception e)
{
Console.WriteLine("Exception: " + e.Message);
Console.WriteLine("Closing websocket connection " + connectionID);
midiManager.SendWebSocketClosedResponse(connectionID);
webSockets[connectionID] = null;
break;
}
// Copy data to an intermediate array in case it needs to be converted from UTF8 to UTF16
byte[] message = new byte[wssr.Count];
Array.Copy(wsBuffers[connectionID].Array, 0, message, 0, wssr.Count);
Console.WriteLine("Received websocket message: " + Encoding.UTF8.GetString(message));
if (wsAutoConvertMessages[connectionID] && (wssr.MessageType == WebSocketMessageType.Text))
{
message = Encoding.Convert(Encoding.UTF8, Encoding.Unicode, message);
}
// Send 4 bytes for response length, 1 bytes for txt/bin flag, and then response data
byte[] responseData = new byte[4 + 1 + message.Length];
Array.Copy(BitConverter.GetBytes(message.Length + 1), 0, responseData, 0, 4);
responseData[4] = wssr.MessageType == WebSocketMessageType.Text ? (byte)0x0 :(byte)0x1;
Array.Copy(message, 0, responseData, 5, message.Length);
midiManager.AddConnectionResponse((byte)connectionID, responseData);
}
}