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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="HttpServer.cs" company="HandBrake Project (http://handbrake.fr)">
// This file is part of the HandBrake source code - It may be used under the terms of the GNU General Public License.
// </copyright>
// <summary>
// This is a service worker for the HandBrake app. It allows us to run encodes / scans in a separate process easily.
// All API's expose the ApplicationServices models as JSON.
// </summary>
// --------------------------------------------------------------------------------------------------------------------
namespace HandBrake.Worker
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Net;
using System.Text;
using System.Threading;
using HandBrake.Worker.Services.Interfaces;
public class HttpServer
{
private readonly ITokenService tokenService;
private readonly HttpListener httpListener = new HttpListener();
private readonly Dictionary<string, Func<HttpListenerRequest, string>> apiHandlers;
private readonly bool failedStart;
public HttpServer(Dictionary<string, Func<HttpListenerRequest, string>> apiCalls, int port, ITokenService tokenService)
{
if (!HttpListener.IsSupported)
{
throw new NotSupportedException("HttpListener not supported on this computer.");
}
this.tokenService = tokenService;
// Store the Handlers
this.apiHandlers = new Dictionary<string, Func<HttpListenerRequest, string>>(apiCalls);
if (!tokenService.IsTokenSet())
{
Console.WriteLine("Worker: No Token Set.");
Console.WriteLine();
Console.WriteLine("API Information: ");
Console.WriteLine("All calls require a 'token' in the HTTP header ");
}
foreach (KeyValuePair<string, Func<HttpListenerRequest, string>> api in apiCalls)
{
string url = string.Format("http://127.0.0.1:{0}/{1}/", port, api.Key);
this.httpListener.Prefixes.Add(url);
if (!tokenService.IsTokenSet())
{
Console.WriteLine(url);
}
}
if (!tokenService.IsTokenSet())
{
Console.WriteLine();
}
try
{
this.httpListener.Start();
}
catch (Exception e)
{
this.failedStart = true;
Console.WriteLine("Worker: Unable to start HTTP Server. Maybe the port {0} is in use?", port);
Console.WriteLine("Worker Exception: " + e);
}
}
public bool Run()
{
if (this.failedStart)
{
return false;
}
ThreadPool.QueueUserWorkItem(o =>
{
try
{
while (this.httpListener.IsListening)
{
ThreadPool.QueueUserWorkItem(
(c) =>
{
var context = c as HttpListenerContext;
if (context == null)
{
return;
}
try
{
string path = context.Request.RawUrl.TrimStart('/').TrimEnd('/');
string token = context.Request.Headers.Get("token");
if (!path.Equals("Version") && !tokenService.IsAuthenticated(token))
{
string rstr = "Worker: Access Denied. The token provided in the HTTP header was not valid.";
Console.WriteLine(rstr);
byte[] buf = Encoding.UTF8.GetBytes(rstr);
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
context.Response.ContentLength64 = buf.Length;
context.Response.OutputStream.Write(buf, 0, buf.Length);
return;
}
Debug.WriteLine("Handling call to: " + path);
if (this.apiHandlers.TryGetValue(path, out var actionToPerform))
{
string rstr = actionToPerform(context.Request);
if (!string.IsNullOrEmpty(rstr))
{
byte[] buf = Encoding.UTF8.GetBytes(rstr);
context.Response.ContentLength64 = buf.Length;
context.Response.OutputStream.Write(buf, 0, buf.Length);
}
}
else
{
string rstr = "Error, There is a missing API handler.";
byte[] buf = Encoding.UTF8.GetBytes(rstr);
context.Response.ContentLength64 = buf.Length;
context.Response.OutputStream.Write(buf, 0, buf.Length);
}
}
catch (Exception exc)
{
Console.WriteLine("Worker: Listener Thread: " + exc);
}
finally
{
context?.Response.OutputStream.Close();
}
},
this.httpListener.GetContext());
}
}
catch (Exception exc)
{
Console.WriteLine("Worker: " + exc);
}
});
return true;
}
public void Stop()
{
this.httpListener.Stop();
this.httpListener.Close();
}
}
}
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