using System.Net; using System.Text; using System.Web; using System.IO; namespace TwitchDesktopNotifications.Core { internal class WebServer { public int Port = 32584; private HttpListener listener; private static WebServer Instance; public static WebServer GetInstance() { if(Instance == null) { Instance= new WebServer(); } return Instance; } public String TwitchCode { get; private set; } public String TwitchState { get; set; } public void Start() { listener = new HttpListener(); listener.Prefixes.Add("http://127.0.0.1:" + Port.ToString() + "/"); listener.Prefixes.Add("http://localhost:" + Port.ToString() + "/"); listener.Start(); new Thread(new ThreadStart(ThreadManagedServer)).Start(); } public event EventHandler CodeRecived; public void Stop() { listener.Stop(); } private void RespondConnection(HttpListenerRequest request, HttpListenerResponse response) { var query = HttpUtility.ParseQueryString(request.Url.Query); if (request.HttpMethod == "GET" && query["state"] == this.TwitchState) { this.TwitchCode = query["code"]; response.StatusCode = (int)HttpStatusCode.OK; response.ContentType = "text/html"; response.OutputStream.Write(Encoding.ASCII.GetBytes("Twitch Connected!

Twitch Desktop Notification

Twitch has been success fully connected. Please close this tab.

")); response.OutputStream.Close(); CodeRecived?.Invoke(this, new EventArgs()); } else {; response.StatusCode = (int)HttpStatusCode.Forbidden; response.ContentType = "text/html"; response.OutputStream.Write(Encoding.ASCII.GetBytes("State Missmatch

State Missmatch

State does not match up preventing XSS.

")); response.OutputStream.Close(); } } private void RespondFavicon(HttpListenerResponse response) { response.StatusCode = (int)HttpStatusCode.OK; response.ContentType = "image/x-icon"; response.OutputStream.Write(File.ReadAllBytes("Assets/icon.ico")); response.OutputStream.Close(); } private void processRequestThread(object? obj) { HttpListenerContext context = (HttpListenerContext)obj; HttpListenerRequest request = context.Request; if (request.Url.AbsolutePath == "/favicon.ico") { RespondFavicon(context.Response); } else if (request.Url.AbsolutePath == "/twitchRedirect") { RespondConnection(request, context.Response); } else { HttpListenerResponse response = context.Response; response.StatusCode = (int)HttpStatusCode.NotFound; response.ContentType = "text/html"; response.OutputStream.Write(Encoding.ASCII.GetBytes("Not Found

Not Found

File not found

")); response.OutputStream.Close(); } } private void ThreadManagedServer() { while (listener.IsListening) { try { HttpListenerContext context = listener.GetContext(); ParameterizedThreadStart pts = new ParameterizedThreadStart(processRequestThread); pts.Invoke(context); } catch (Exception e) { } } } } }