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//O2Ref:System.Configuration.dll
using System;
using System.Configuration;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Net.Security;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;

using O2.Kernel.ExtensionMethods;

namespace HTTPProxyServer
{
public class Tuple<T>
{
public Tuple(T first)
{
Item1 = first;
}

public T Item1 { get; set; }
}

public class Tuple<T, T2> : Tuple<T>
{
public Tuple(T first, T2 second)
: base(first)
{
Item2 = second;
}

public T2 Item2 { get; set; }

}

public class Tuple<T, T2, T3> : Tuple<T, T2>
{
public Tuple(T first, T2 second, T3 third)
: base(first, second)
{
Third = third;
}

public T3 Third { get; set; }
}

public class Tuple<T, T2, T3, T4> : Tuple<T, T2, T3>
{
public Tuple(T first, T2 second, T3 third, T4 fourth)
: base(first, second, third)
{
Fourth = fourth;
}

public T4 Fourth { get; set; }
}


public sealed class ProxyServer
{
public static Func<string, string> InterceptRemoteUrl;
public static Func<Uri, bool> InterceptResponseHtml;
public static Func<Uri,string, string> HtmlContentReplace;
public static Action<HttpWebRequest> InterceptWebRequest;

private static readonly ProxyServer _server = new ProxyServer();

private static readonly int BUFFER_SIZE = 8192;
private static readonly char[] semiSplit = new char[] { ';' };
private static readonly char[] equalSplit = new char[] { '=' };
private static readonly String[] colonSpaceSplit = new string[] { ": " };
private static readonly char[] spaceSplit = new char[] { ' ' };
private static readonly char[] commaSplit = new char[] { ',' };
private static readonly Regex cookieSplitRegEx = new Regex(@",(?! )");
private static X509Certificate2 _certificate;
private static object _outputLockObj = new object();


private TcpListener _listener;
private Thread _listenerThread;
private Thread _cacheMaintenanceThread;

public IPAddress ListeningIPInterface
{
get
{
IPAddress addr = IPAddress.Loopback;
if (ConfigurationManager.AppSettings["ListeningIPInterface"] != null)
IPAddress.TryParse(ConfigurationManager.AppSettings["ListeningIPInterface"], out addr);

return addr;
}
}

public Int32 ListeningPort
{
get
{
Int32 port = 8081;
if(ConfigurationManager.AppSettings["ListeningPort"] != null)
Int32.TryParse(ConfigurationManager.AppSettings["ListeningPort"],out port);

return port;
}
}

private ProxyServer()
{
ServicePointManager.ServerCertificateValidationCallback =
delegate {
return true;
} ;
_listener = new TcpListener(ListeningIPInterface, ListeningPort);
// ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };
}

public Boolean DumpHeaders { get; set; }
public Boolean DumpPostData { get; set; }
public Boolean DumpResponseData { get; set; }

public static ProxyServer Server
{
get { return _server; }
}

public bool Start()
{
String certFilePath = String.Empty;
if (ConfigurationManager.AppSettings["CertificateFile"] != null)
certFilePath = ConfigurationManager.AppSettings["CertificateFile"];
return Start(certFilePath);
}


public bool Start(string certFilePath)
{
"Starting Proxy Server using Certificate: {0}".info(certFilePath);
try
{
try
{
_certificate = new X509Certificate2(certFilePath);
}
catch (Exception ex)
{
throw new ConfigurationErrorsException(String.Format("Could not create the certificate from file from {0}",certFilePath), ex);
}
_listener.Start();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return false;
}

_listenerThread = new Thread(new ParameterizedThreadStart(Listen));
_cacheMaintenanceThread = new Thread(new ThreadStart(ProxyCache.CacheMaintenance));

_listenerThread.Start(_listener);
_cacheMaintenanceThread.Start();

return true;
}

public void Stop()
{
"Stopping Proxy Server".info();
_listener.Stop();

//wait for server to finish processing current connections...

_listenerThread.Abort();
_cacheMaintenanceThread.Abort();
_listenerThread.Join();
_listenerThread.Join();
}

private static void Listen(Object obj)
{
TcpListener listener = (TcpListener)obj;
try
{
while (true)
{
TcpClient client = listener.AcceptTcpClient();
while (!ThreadPool.QueueUserWorkItem(new WaitCallback(ProxyServer.ProcessClient), client)) ;
}
}
catch (ThreadAbortException) { }
catch (SocketException) { }
}


private static void ProcessClient(Object obj)
{
TcpClient client = (TcpClient)obj;
try
{
DoHttpProcessing(client);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
client.Close();
}
}

private static void DoHttpProcessing(TcpClient client)
{
Stream clientStream = client.GetStream();
Stream outStream = clientStream; //use this stream for writing out - may change if we use ssl
SslStream sslStream = null;
StreamReader clientStreamReader = new StreamReader(clientStream);
CacheEntry cacheEntry = null;
MemoryStream cacheStream = null;

if (Server.DumpHeaders || Server.DumpPostData || Server.DumpResponseData)
{
//make sure that things print out in order - NOTE: this is bad for performance
Monitor.TryEnter(_outputLockObj, TimeSpan.FromMilliseconds(-1.0));
}

try
{
//read the first line HTTP command
String httpCmd = clientStreamReader.ReadLine();
if (String.IsNullOrEmpty(httpCmd))
{
clientStreamReader.Close();
clientStream.Close();
return;
}
//break up the line into three components
String[] splitBuffer = httpCmd.Split(spaceSplit, 3);

String method = splitBuffer[0];
String remoteUri = splitBuffer[1];
Version version = new Version(1, 0);

HttpWebRequest webReq;
HttpWebResponse response = null;
if (splitBuffer[0].ToUpper() == "CONNECT")
{
//Browser wants to create a secure tunnel
//instead = we are going to perform a man in the middle "attack"
//the user's browser should warn them of the certification errors however.
//Please note: THIS IS ONLY FOR TESTING PURPOSES - you are responsible for the use of this code
remoteUri = "https://" + splitBuffer[1];
while (!String.IsNullOrEmpty(clientStreamReader.ReadLine())) ;
StreamWriter connectStreamWriter = new StreamWriter(clientStream);
connectStreamWriter.WriteLine("HTTP/1.0 200 Connection established");
connectStreamWriter.WriteLine(String.Format("Timestamp: {0}", DateTime.Now.ToString()));
connectStreamWriter.WriteLine("Proxy-agent: matt-dot-net");
connectStreamWriter.WriteLine();
connectStreamWriter.Flush();

sslStream = new SslStream(clientStream, false);
try
{
//sslStream.AuthenticateAsServer(_certificate, false, SslProtocols.Tls | SslProtocols.Ssl3 | SslProtocols.Ssl2, true);
sslStream.AuthenticateAsServer(_certificate, false, SslProtocols.Tls | SslProtocols.Ssl3 | SslProtocols.Ssl2, false);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
sslStream.Close();
clientStreamReader.Close();
connectStreamWriter.Close();
clientStream.Close();
return;
}

//HTTPS server created - we can now decrypt the client's traffic
clientStream = sslStream;
clientStreamReader = new StreamReader(sslStream);
outStream = sslStream;
//read the new http command.
httpCmd = clientStreamReader.ReadLine();
if (String.IsNullOrEmpty(httpCmd))
{
clientStreamReader.Close();
clientStream.Close();
sslStream.Close();
return;
}
splitBuffer = httpCmd.Split(spaceSplit, 3);
method = splitBuffer[0];
remoteUri = remoteUri + splitBuffer[1];
}

//construct the web request that we are going to issue on behalf of the client.

if (InterceptRemoteUrl.notNull())
remoteUri = InterceptRemoteUrl(remoteUri);

webReq = (HttpWebRequest)HttpWebRequest.Create(remoteUri);
webReq.Method = method;
webReq.ProtocolVersion = version;

//read the request headers from the client and copy them to our request
int contentLen = ReadRequestHeaders(clientStreamReader, webReq);

webReq.Proxy = null;
webReq.KeepAlive = false;
webReq.AllowAutoRedirect = false;
webReq.AutomaticDecompression = DecompressionMethods.None;



String.Format("{0} {1} HTTP/{2}", webReq.Method, webReq.RequestUri.AbsoluteUri, webReq.ProtocolVersion).debug();
if(Server.DumpHeaders)
{
Console.WriteLine(String.Format("{0} {1} HTTP/{2}",webReq.Method,webReq.RequestUri.AbsoluteUri, webReq.ProtocolVersion));
DumpHeaderCollectionToConsole(webReq.Headers);
}

if (InterceptWebRequest.notNull())
InterceptWebRequest(webReq);

//using the completed request, check our cache
if (method.ToUpper() == "GET")
cacheEntry = ProxyCache.GetData(webReq);
else if (method.ToUpper() == "POST")
{
char[] postBuffer = new char[contentLen];
int bytesRead;
int totalBytesRead = 0;
StreamWriter sw = new StreamWriter(webReq.GetRequestStream());
while (totalBytesRead < contentLen && (bytesRead = clientStreamReader.ReadBlock(postBuffer, 0, contentLen)) > 0)
{
totalBytesRead += bytesRead;
sw.Write(postBuffer, 0, bytesRead);
if (ProxyServer.Server.DumpPostData)
Console.Write(postBuffer, 0, bytesRead);
}
if (Server.DumpPostData)
{
Console.WriteLine();
Console.WriteLine();
}

sw.Close();
}

if (cacheEntry == null)
{
//Console.WriteLine(String.Format("ThreadID: {2} Requesting {0} on behalf of client {1}", webReq.RequestUri, client.Client.RemoteEndPoint.ToString(), Thread.CurrentThread.ManagedThreadId));
webReq.Timeout = 15000;

try
{
response = (HttpWebResponse)webReq.GetResponse();
}
catch (WebException webEx)
{
response = webEx.Response as HttpWebResponse;
}
if (response != null)
{
List<Tuple<String,String>> responseHeaders = ProcessResponse(response);
StreamWriter myResponseWriter = new StreamWriter(outStream);
Stream responseStream = response.GetResponseStream();
try
{
//send the response status and response headers
WriteResponseStatus(response.StatusCode,response.StatusDescription, myResponseWriter);
WriteResponseHeaders(myResponseWriter, responseHeaders);

DateTime? expires = null;
CacheEntry entry = null;
Boolean canCache = (sslStream == null && ProxyCache.CanCache(response.Headers, ref expires));
if (canCache)
{
entry = ProxyCache.MakeEntry(webReq, response,responseHeaders, expires);
if (response.ContentLength > 0)
cacheStream = new MemoryStream(entry.ResponseBytes);
}

Byte[] buffer;
if (response.ContentLength > 0)
buffer = new Byte[response.ContentLength];
else
buffer = new Byte[BUFFER_SIZE];

int bytesRead;

while ((bytesRead = responseStream.Read(buffer, 0, buffer.Length)) > 0)
{
if (cacheStream != null)
cacheStream.Write(buffer, 0, bytesRead);

if (InterceptResponseHtml.isNull() || InterceptResponseHtml(webReq.RequestUri) == false)
{
//"No Interception for: {0}".info(webReq.RequestUri);
outStream.Write(buffer, 0, bytesRead);
}
else
{

//
//buffer.Pos = 0;

if (HtmlContentReplace.notNull())
{
var dataReceived = UTF8Encoding.UTF8.GetString(buffer, 0, bytesRead);
"dataReceived: size {0}".info(dataReceived.size());
//"invoking: HtmlContentReplace".info();
var newDataReceived = HtmlContentReplace(webReq.RequestUri, dataReceived);
//if(newDataReceived != dataReceived)
outStream.Write(UTF8Encoding.UTF8.GetBytes(newDataReceived), 0, newDataReceived.size());
// else
// cacheStream.Write(buffer, 0, bytesRead);
}
else
cacheStream.Write(buffer, 0, bytesRead);

}
if (Server.DumpResponseData)
Console.Write(UTF8Encoding.UTF8.GetString(buffer, 0, bytesRead));
//outStream.Write(buffer, 0, bytesRead);

}
if (Server.DumpResponseData)
{
Console.WriteLine();
Console.WriteLine();
}

responseStream.Close();
if (cacheStream != null)
{
cacheStream.Flush();
cacheStream.Close();
}

outStream.Flush();
if (canCache)
ProxyCache.AddData(entry);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
responseStream.Close();
response.Close();
myResponseWriter.Close();
}
}
}
else
{
//serve from cache
StreamWriter myResponseWriter = new StreamWriter(outStream);
try
{
WriteResponseStatus(cacheEntry.StatusCode, cacheEntry.StatusDescription, myResponseWriter);
WriteResponseHeaders(myResponseWriter, cacheEntry.Headers);
if (cacheEntry.ResponseBytes != null)
{
outStream.Write(cacheEntry.ResponseBytes, 0, cacheEntry.ResponseBytes.Length);
if (ProxyServer.Server.DumpResponseData)
Console.Write(UTF8Encoding.UTF8.GetString(cacheEntry.ResponseBytes));
}
myResponseWriter.Close();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
myResponseWriter.Close();
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
if (Server.DumpHeaders || Server.DumpPostData || Server.DumpResponseData)
{
//release the lock
Monitor.Exit(_outputLockObj);
}

clientStreamReader.Close();
clientStream.Close();
if (sslStream != null)
sslStream.Close();
outStream.Close();
if (cacheStream != null)
cacheStream.Close();
}

}

private static List<Tuple<String,String>> ProcessResponse(HttpWebResponse response)
{
String value=null;
String header=null;
List<Tuple<String, String>> returnHeaders = new List<Tuple<String, String>>();
foreach (String s in response.Headers.Keys)
{
if (s.ToLower() == "set-cookie")
{
header = s;
value = response.Headers[s];
}
else
returnHeaders.Add(new Tuple<String, String>(s, response.Headers[s]));
}

//if (!String.IsNullOrWhiteSpace(value))
if (!String.IsNullOrEmpty(value))
{
response.Headers.Remove(header);
String[] cookies = cookieSplitRegEx.Split(value);
foreach (String cookie in cookies)
returnHeaders.Add(new Tuple<String, String>("Set-Cookie", cookie));

}
returnHeaders.Add(new Tuple<String, String>("X-Proxied-By", "matt-dot-net proxy"));
return returnHeaders;
}

private static void WriteResponseStatus(HttpStatusCode code, String description, StreamWriter myResponseWriter)
{
String s = String.Format("HTTP/1.0 {0} {1}", (Int32)code, description);
myResponseWriter.WriteLine(s);
if(ProxyServer.Server.DumpHeaders)
Console.WriteLine(s);
}

private static void WriteResponseHeaders(StreamWriter myResponseWriter, List<Tuple<String,String>> headers)
{
if (headers != null)
{
foreach (Tuple<String,String> header in headers)
myResponseWriter.WriteLine(String.Format("{0}: {1}", header.Item1,header.Item2));
}
myResponseWriter.WriteLine();
myResponseWriter.Flush();

if (Server.DumpHeaders)
DumpHeaderCollectionToConsole(headers);
}

private static void DumpHeaderCollectionToConsole(WebHeaderCollection headers)
{
foreach (String s in headers.AllKeys)
Console.WriteLine(String.Format("{0}: {1}", s,headers[s]));
Console.WriteLine();
}

private static void DumpHeaderCollectionToConsole(List<Tuple<String,String>> headers)
{
foreach (Tuple<String,String> header in headers)
Console.WriteLine(String.Format("{0}: {1}", header.Item1,header.Item2));
Console.WriteLine();
}

private static int ReadRequestHeaders(StreamReader sr, HttpWebRequest webReq)
{
String httpCmd;
int contentLen = 0;
do
{
httpCmd = sr.ReadLine();
if (String.IsNullOrEmpty(httpCmd))
return contentLen;
String[] header = httpCmd.Split(colonSpaceSplit, 2, StringSplitOptions.None);
switch (header[0].ToLower())
{
case "host":
//webReq.Host = header[1];
break;
case "user-agent":
webReq.UserAgent = header[1];
break;
case "accept":
webReq.Accept = header[1];
break;
case "referer":
webReq.Referer = header[1];
break;
case "cookie":
webReq.Headers["Cookie"] = header[1];
break;
case "proxy-connection":
case "connection":
case "keep-alive":
//ignore these
break;
case "content-length":
int.TryParse(header[1], out contentLen);
break;
case "content-type":
webReq.ContentType = header[1];
break;
case "if-modified-since":
String[] sb = header[1].Trim().Split(semiSplit);
DateTime d;
if (DateTime.TryParse(sb[0], out d))
webReq.IfModifiedSince = d;
break;
default:
try
{
webReq.Headers.Add(header[0], header[1]);
}
catch (Exception ex)
{
Console.WriteLine(String.Format("Could not add header {0}. Exception message:{1}", header[0], ex.Message));
}
break;
}
} while (!String.IsNullOrEmpty(httpCmd)); //(!String.IsNullOrWhiteSpace(httpCmd));
return contentLen;
}
}
}

Change log

r872 by di...@ddplus.net on Nov 22, 2011   Diff
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