Add HTTP Server
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netstandard1.4</TargetFramework>
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</PropertyGroup>
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</Project>
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netstandard2.0</TargetFramework>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Newtonsoft.Json" Version="10.0.2" />
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</ItemGroup>
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</Project>
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@ -0,0 +1,92 @@
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using System;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using System.Net;
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using System.Net.WebSockets;
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namespace Ooui
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{
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public class Server
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{
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public Task RunAsync (string listenerPrefix)
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{
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return RunAsync (listenerPrefix, CancellationToken.None);
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}
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public async Task RunAsync (string listenerPrefix, CancellationToken token)
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{
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var listener = new HttpListener ();
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listener.Prefixes.Add (listenerPrefix);
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listener.Start ();
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Console.WriteLine ($"Listening at {listenerPrefix}...");
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while (!token.IsCancellationRequested) {
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var listenerContext = await listener.GetContextAsync ();
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if (listenerContext.Request.IsWebSocketRequest) {
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ProcessWebSocketRequest (listenerContext, token);
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}
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else {
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listenerContext.Response.StatusCode = 400;
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listenerContext.Response.Close ();
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}
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}
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}
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async void ProcessWebSocketRequest (HttpListenerContext listenerContext, CancellationToken token)
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{
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WebSocketContext webSocketContext = null;
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try {
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webSocketContext = await listenerContext.AcceptWebSocketAsync(subProtocol: null);
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Console.WriteLine ("Accepted WebSocket: {0}", webSocketContext);
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}
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catch (Exception e) {
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listenerContext.Response.StatusCode = 500;
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listenerContext.Response.Close();
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Console.WriteLine ("Failed to accept WebSocket: {0}", e);
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return;
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}
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WebSocket webSocket = null;
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try {
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webSocket = webSocketContext.WebSocket;
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var receiveBuffer = new byte[1024];
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while (webSocket.State == WebSocketState.Open && !token.IsCancellationRequested) {
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var receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(receiveBuffer), token);
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if (receiveResult.MessageType == WebSocketMessageType.Close) {
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await webSocket.CloseAsync (WebSocketCloseStatus.NormalClosure, "", token);
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}
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else if (receiveResult.MessageType == WebSocketMessageType.Binary) {
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await webSocket.CloseAsync (WebSocketCloseStatus.InvalidMessageType, "Cannot accept binary frame", token);
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}
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else {
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var size = receiveResult.Count;
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while (!receiveResult.EndOfMessage) {
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if (size >= receiveBuffer.Length) {
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await webSocket.CloseAsync (WebSocketCloseStatus.MessageTooBig, "Message too big", token);
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return;
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}
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receiveResult = await webSocket.ReceiveAsync (new ArraySegment<byte>(receiveBuffer, size, receiveBuffer.Length - size), token);
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size += receiveResult.Count;
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}
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var receivedString = Encoding.UTF8.GetString (receiveBuffer, 0, size);
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Console.WriteLine ("RECEIVED: {0}", receivedString);
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var outputBuffer = new ArraySegment<byte> (Encoding.UTF8.GetBytes ($"You said: {receivedString}"));
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await webSocket.SendAsync (outputBuffer, WebSocketMessageType.Text, true, token);
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}
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}
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}
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catch (Exception e) {
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Console.WriteLine ("Exception: {0}", e);
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}
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finally {
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webSocket?.Dispose();
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}
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}
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}
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}
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