//
// Mono.WebServer.XSPApplicationHost
//
// Authors:
//	Gonzalo Paniagua Javier (gonzalo@ximian.com)
//	Lluis Sanchez Gual (lluis@ximian.com)
//
// (C) Copyright 2004-2010 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Globalization;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
using X509Certificate = System.Security.Cryptography.X509Certificates.X509Certificate;

namespace Mono.WebServer
{	
	//
	// XSPApplicationHost: The application host for XSP.
	//
	public class XSPApplicationHost : BaseApplicationHost
	{
		// This method is only compatible with IPv4, please use IPEndPoint based overload.
		public void ProcessRequest(int reqId, long localEPAddr, int localEPPort, long remoteEPAdds,
					   int remoteEPPort, string verb, string path,
					   string queryString, string protocol, byte[] inputBuffer, string redirect,
					   IntPtr socket, SslInformation ssl)
		{
			var localEP = new IPEndPoint (localEPAddr, localEPPort);
			var remoteEP = new IPEndPoint (remoteEPAdds, remoteEPPort);
			ProcessRequest (reqId, localEP, remoteEP, verb, path, queryString, protocol, inputBuffer, redirect, socket, ssl);
		}

		public void ProcessRequest(int reqId, IPEndPoint localEP, IPEndPoint remoteEP,
					   string verb, string path,
					   string queryString, string protocol, byte [] inputBuffer, string redirect,
					   IntPtr socket, SslInformation ssl)
		{
			var broker = (XSPRequestBroker) RequestBroker;
			bool secure = (ssl != null);
			var mwr = new XSPWorkerRequest (reqId, broker, this,
				localEP, remoteEP, verb, path, queryString,
				protocol, inputBuffer, socket, secure);

			if (secure) {
				// note: we're only setting what we use (and not the whole lot)
				mwr.AddServerVariable ("CERT_KEYSIZE", ssl.KeySize.ToString (CultureInfo.InvariantCulture));
				mwr.AddServerVariable ("CERT_SECRETKEYSIZE", ssl.SecretKeySize.ToString (CultureInfo.InvariantCulture));
 
				if (ssl.RawClientCertificate != null) {
					// the worker need to be able to return it (if asked politely)
					mwr.SetClientCertificate (ssl.RawClientCertificate);

					// XSPWorkerRequest will answer, as required, for CERT_COOKIE, CERT_ISSUER, 
					// CERT_SERIALNUMBER and CERT_SUBJECT (as anyway it requires the client 
					// certificate - if it was provided)

					if (ssl.ClientCertificateValid) {
						// client cert present (bit0 = 1) and valid (bit1 = 0)
						mwr.AddServerVariable ("CERT_FLAGS", "1");
					} else {
						// client cert present (bit0 = 1) but invalid (bit1 = 1)
						mwr.AddServerVariable ("CERT_FLAGS", "3");
					}
				} else {
					// no client certificate (bit0 = 0) ? does bit1 matter ?
					mwr.AddServerVariable ("CERT_FLAGS", "0");
				}

				if (ssl.RawServerCertificate != null) {
					X509Certificate server = ssl.GetServerCertificate ();
					mwr.AddServerVariable ("CERT_SERVER_ISSUER", server.Issuer);
					mwr.AddServerVariable ("CERT_SERVER_SUBJECT", server.Subject);
				}
			}

			string translated = mwr.GetFilePathTranslated ();
			if (path [path.Length - 1] != '/' && Directory.Exists (translated))
				redirect = path + '/';

			if (redirect != null) {
				Redirect (mwr, redirect);
				broker.UnregisterRequest (reqId);
				return;
			}

			ProcessRequest (mwr);
		}

		const string CONTENT301 = "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" +
				"<html><head>\n<title>301 Moved Permanently</title>\n</head><body>\n" +
				"<h1>Moved Permanently</h1>\n" +
				"<p>The document has moved to <a href='http://{0}{1}'>http://{0}{1}</a>.</p>\n" +
				"</body></html>\n";

		static void Redirect (HttpWorkerRequest wr, string location)
		{
			string host = wr.GetKnownRequestHeader (HttpWorkerRequest.HeaderHost);
			wr.SendStatus (301, "Moved Permanently");
			wr.SendUnknownResponseHeader ("Connection", "close");
			wr.SendUnknownResponseHeader ("Date", DateTime.Now.ToUniversalTime ().ToString ("r"));
			wr.SendUnknownResponseHeader ("Location", String.Format ("http://{0}{1}", host, location));
			Encoding enc = Encoding.ASCII;
			wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
			string content = String.Format (CONTENT301, host, location);
			byte [] contentBytes = enc.GetBytes (content);
			wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
			wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
			wr.FlushResponse (true);
			wr.CloseConnection ();
		}
	}
}