private void Process(IAsyncResult ar)
{
HttpListenerContext ctx = null;
try
{
ctx = _listener.EndGetContext(ar);
}
catch (HttpListenerException ex) when(ex.ErrorCode == 995) // ERROR_OPERATION_ABORTED = 995
{
// Request was aborted. Most likely the listener has been stopped
// Ignore these
}
if (_isRunning)
{
_listener.BeginGetContext(Process, null);
}
if (ctx == null)
{
return;
}
// Process the current context
HttpMethod requestedMethod = new HttpMethod(ctx.Request.HttpMethod);
if (requestedMethod != HttpMethod.Get && requestedMethod != HttpMethod.Post)
{
ctx.Response.StatusCode = (int)HttpStatusCode.MethodNotAllowed;
ctx.Response.OutputStream.WriteString($"Unsupported method: {requestedMethod}");
return;
}
if (ctx.Request.Url.PathAndQuery == "/")
{
// Asked for root - send the client to the overview page
ctx.Response.StatusCode = (int)HttpStatusCode.TemporaryRedirect;
ctx.Response.RedirectLocation = "/game/index.php?page=overview";
ctx.Response.OutputStream.WriteString("Redirecting to Overview");
// Return
ctx.Response.Close();
return;
}
// Prepare uri
Uri targetUri = new Uri(SubstituteRoot, ctx.Request.Url.PathAndQuery);
// NOTE: Enable this to load external ressources through proxy
//if (targetUri.AbsolutePath.StartsWith("/SPECIAL/"))
//{
// // Request is not for our target. It's for elsewhere
// string rest = string.Join("", targetUri.Segments.Skip(2));
// rest = rest.Replace(":/", "://");
// targetUri = new Uri(rest);
//}
// Prepare request
HttpRequestMessage proxyReq = _client.BuildRequest(targetUri);
proxyReq.Method = requestedMethod;
if (requestedMethod == HttpMethod.Post)
{
MemoryStream ms = new MemoryStream();
ctx.Request.InputStream.CopyTo(ms);
ms.Seek(0, SeekOrigin.Begin);
proxyReq.Content = new StreamContent(ms);
proxyReq.Content.Headers.ContentType = MediaTypeHeaderValue.Parse(ctx.Request.ContentType);
}
// Issue
ResponseContainer resp = _client.IssueRequest(proxyReq);
byte[] data = resp.ResponseMessage.Content.ReadAsByteArrayAsync().Sync();
foreach (string encoding in resp.ResponseMessage.Content.Headers.ContentEncoding)
{
if (encoding == "gzip")
{
using (var ms = new MemoryStream(data))
using (var gzip = new GZipStream(ms, CompressionMode.Decompress))
using (var msTarget = new MemoryStream())
{
gzip.CopyTo(msTarget);
data = msTarget.ToArray();
}
}
}
// Rewrite html/js
if (resp.IsHtmlResponse || resp.ResponseMessage.Content.Headers.ContentType.MediaType == "application/x-javascript")
{
string str = Encoding.UTF8.GetString(data);
// NOTE: Enable this to load external ressources through proxy
//str = Regex.Replace(str, @"(https://gf[\d]+.geo.gfsrv.net/)", $"http://{_listenHost}:{_listenPort}/SPECIAL/$0", RegexOptions.Compiled);
str = str.Replace(SubstituteRoot.ToString().Replace("/", "\\/"), $@"http:\/\/{_listenHost}:{_listenPort}\/"); // In JS strings
str = str.Replace(SubstituteRoot.ToString(), $"http://{_listenHost}:{_listenPort}/"); // In links
str = str.Replace(SubstituteRoot.Host + ":" + SubstituteRoot.Port, $"{_listenHost}:{_listenPort}"); // Without scheme
str = str.Replace(SubstituteRoot.Host, $"{_listenHost}:{_listenPort}"); // Remainders
data = Encoding.UTF8.GetBytes(str);
}
// Write headers
ctx.Response.StatusCode = (int)resp.StatusCode;
foreach (KeyValuePair <string, IEnumerable <string> > header in resp.ResponseMessage.Headers)
{
foreach (string value in header.Value)
{
ctx.Response.AddHeader(header.Key, value);
}
}
ctx.Response.ContentType = resp.ResponseMessage.Content.Headers.ContentType.ToString();
// Write content
ctx.Response.OutputStream.Write(data, 0, data.Length);
// Return
ctx.Response.Close();
}
private void Process(IAsyncResult ar)
{
HttpListenerContext ctx = null;
try
{
ctx = _listener.EndGetContext(ar);
}
catch (HttpListenerException ex) when(ex.ErrorCode == 995) // ERROR_OPERATION_ABORTED = 995
{
// Request was aborted. Most likely the listener has been stopped
// Ignore these
}
if (_isRunning)
{
_listener.BeginGetContext(Process, null);
}
if (ctx == null)
{
return;
}
string host = ctx.Request.Url.DnsSafeHost;
int port = ctx.Request.Url.Port;
string referer = ctx.Request.Headers.Get("Referer");
string requestedWith = ctx.Request.Headers.Get("X-Requested-With");
// Process the current context
HttpMethod requestedMethod = new HttpMethod(ctx.Request.HttpMethod);
if (requestedMethod != HttpMethod.Get && requestedMethod != HttpMethod.Post)
{
ctx.Response.StatusCode = (int)HttpStatusCode.MethodNotAllowed;
ctx.Response.OutputStream.WriteString($"Unsupported method: {requestedMethod}");
return;
}
Action <string> Redirect = (location) =>
{
ctx.Response.StatusCode = (int)HttpStatusCode.TemporaryRedirect;
ctx.Response.RedirectLocation = location;
ctx.Response.OutputStream.WriteString("Redirecting to Overview");
// Return
ctx.Response.Close();
};
string overview = "/game/index.php?page=overview";
if (ctx.Request.Url.PathAndQuery == "/")
{
// Asked for root - pretend there's nothing here for public addresses, redirect to overview for local
var localEndPoint = ctx.Request.LocalEndPoint;
if (IsLocal(localEndPoint.Address))
{
Redirect(overview);
}
else
{
ctx.Response.Close();
}
return;
}
else if (ctx.Request.Url.PathAndQuery.StartsWith($"/{CommandPrefix}/"))
{
bool result = ParseAndRunCommand(ctx.Request.Url.AbsolutePath, ctx.Request.QueryString);
if (requestedWith == "XMLHttpRequest")
{
ctx.Response.StatusCode = (int)(result ? HttpStatusCode.OK : HttpStatusCode.BadRequest);
ctx.Response.Close();
return;
}
Redirect(referer != null ? referer : overview);
return;
}
// Prepare uri
var pathAndQuery = ctx.Request.Url.PathAndQuery;
if (pathAndQuery.Contains("redir.php"))
{
pathAndQuery = pathAndQuery.Replace(Uri.EscapeDataString($"http://{host}:{port}/"), Uri.EscapeDataString(SubstituteRoot.ToString()));
}
Uri targetUri = new Uri(SubstituteRoot, pathAndQuery);
// NOTE: Enable this to load external ressources through proxy
//if (targetUri.AbsolutePath.StartsWith("/SPECIAL/"))
//{
// // Request is not for our target. It's for elsewhere
// string rest = string.Join("", targetUri.Segments.Skip(2));
// rest = rest.Replace(":/", "://");
// targetUri = new Uri(rest);
//}
// Prepare request
HttpRequestMessage proxyReq = _client.BuildRequest(targetUri);
proxyReq.Method = requestedMethod;
if (referer != null)
{
referer = referer.Replace($"http://{host}:{port}/", SubstituteRoot.ToString());
proxyReq.Headers.TryAddWithoutValidation("Referer", referer);
}
if (requestedWith != null)
{
proxyReq.Headers.TryAddWithoutValidation("X-Requested-With", requestedWith);
}
if (requestedMethod == HttpMethod.Post)
{
proxyReq.Content = CopyPostContent(ctx.Request.InputStream);
if (ctx.Request.ContentType != null)
{
proxyReq.Content.Headers.ContentType = MediaTypeHeaderValue.Parse(ctx.Request.ContentType);
}
}
// Issue
ResponseContainer resp = _client.IssueRequest(proxyReq);
byte[] data = resp.ResponseMessage.Content.ReadAsByteArrayAsync().Sync();
foreach (string encoding in resp.ResponseMessage.Content.Headers.ContentEncoding)
{
if (encoding == "gzip")
{
using (var ms = new MemoryStream(data))
using (var gzip = new GZipStream(ms, CompressionMode.Decompress))
using (var msTarget = new MemoryStream())
{
gzip.CopyTo(msTarget);
data = msTarget.ToArray();
}
}
}
// Rewrite html/js
if (resp.IsHtmlResponse || resp.ResponseMessage.Content?.Headers?.ContentType?.MediaType == "application/x-javascript")
{
string str = Encoding.UTF8.GetString(data);
// NOTE: Enable this to load external ressources through proxy
//str = Regex.Replace(str, @"(https://gf[\d]+.geo.gfsrv.net/)", $"http://{_listenHost}:{_listenPort}/SPECIAL/$0", RegexOptions.Compiled);
str = str.Replace(SubstituteRoot.ToString().Replace("/", "\\/"), $@"http:\/\/{host}:{port}\/"); // In JS strings
str = str.Replace(SubstituteRoot.ToString(), $"http://{host}:{port}/"); // In links
str = str.Replace(SubstituteRoot.Host + ":" + SubstituteRoot.Port, $"{host}:{port}"); // Without scheme
str = str.Replace(SubstituteRoot.Host, $"{host}:{port}"); // Remainders
// To make overlays work, there is a check against ogameUrl in javascript
str = _client.Inject(str, resp, host, port);
data = Encoding.UTF8.GetBytes(str);
}
// Write headers
ctx.Response.StatusCode = (int)resp.StatusCode;
foreach (KeyValuePair <string, IEnumerable <string> > header in resp.ResponseMessage.Headers)
{
foreach (string value in header.Value)
{
ctx.Response.AddHeader(header.Key, value);
}
}
ctx.Response.ContentType = resp.ResponseMessage.Content?.Headers?.ContentType?.ToString();
// Write content
try
{
ctx.Response.OutputStream.Write(data, 0, data.Length);
ctx.Response.Close();
}
// Specified name is no longer available, ignore, another request was made
catch (HttpListenerException ex) when(ex.ErrorCode == 64)
{
}
catch (HttpListenerException ex)
{
Logger.Instance.LogException(ex);
}
}