/*
   WebServer.cpp

   Copyright (C) 2003-2007 René Nyffenegger

   This source code is provided 'as-is', without any express or implied
   warranty. In no event will the author be held liable for any damages
   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely, subject to the following restrictions:

   1. The origin of this source code must not be misrepresented; you must not
      claim that you wrote the original source code. If you use this source code
      in a product, an acknowledgment in the product documentation would be
      appreciated but is not required.

   2. Altered source versions must be plainly marked as such, and must not be
      misrepresented as being the original source code.

   3. This notice may not be removed or altered from any source distribution.

   René Nyffenegger rene.nyffenegger@adp-gmbh.ch

   Thanks to Tom Lynn who pointed out an error in this source code.
*/

/*
	Note on point 2:
		THIS IS NOT THE ORIGINAL SOURCE1!!1!!!~!!~`1ONE!!`1
*/

#include <ctime>
#ifdef _WIN32
#include <process.h>
#endif
#include <iostream>
#include <string>
#include <map>
#include <sstream>


#include "WebServer.h"
#include "Socket.h"
#include "UrlHelper.h"
#include "base64.h"

#include "cEvent.h"


webserver::request_func webserver::request_func_=0;

#ifdef _WIN32
unsigned webserver::Request(void* ptr_s)
#else
void* webserver::Request(void* ptr_s)
#endif
{
  Socket* s = (reinterpret_cast<Socket*>(ptr_s));

  std::string line = s->ReceiveLine();
  if (line.empty()) {
	s->Close();
	delete s;
    return 0;
  }

  http_request req;

  if (line.find("GET") == 0) {
    req.method_="GET";
  }
  else if (line.find("POST") == 0) {
    req.method_="POST";
  }

  std::string path;
  std::map<std::string, std::string> params;

  size_t posStartPath = line.find_first_not_of(" ",3);

  SplitGetReq(line.substr(posStartPath), path, params);

  req.status_ = "202 OK";
  req.s_      = s;
  req.path_   = path;
  req.params_ = params;

  static const std::string authorization   = "Authorization: Basic ";
  static const std::string accept          = "Accept: "             ;
  static const std::string accept_language = "Accept-Language: "    ;
  static const std::string accept_encoding = "Accept-Encoding: "    ;
  static const std::string user_agent      = "User-Agent: "         ;

  while(1) {
    line=s->ReceiveLine();

    if (line.empty()) break;

    unsigned int pos_cr_lf = line.find_first_of("\x0a\x0d");
    if (pos_cr_lf == 0) break;

    line = line.substr(0,pos_cr_lf);

    if (line.substr(0, authorization.size()) == authorization) {
      req.authentication_given_ = true;
      std::string encoded = line.substr(authorization.size());
      std::string decoded = base64_decode(encoded);

      unsigned int pos_colon = decoded.find(":");

      req.username_ = decoded.substr(0, pos_colon);
      req.password_ = decoded.substr(pos_colon+1 );
    }
    else if (line.substr(0, accept.size()) == accept) {
      req.accept_ = line.substr(accept.size());
    }
    else if (line.substr(0, accept_language.size()) == accept_language) {
      req.accept_language_ = line.substr(accept_language.size());
    }
    else if (line.substr(0, accept_encoding.size()) == accept_encoding) {
      req.accept_encoding_ = line.substr(accept_encoding.size());
    }
    else if (line.substr(0, user_agent.size()) == user_agent) {
      req.user_agent_ = line.substr(user_agent.size());
    }
  }

  request_func_(&req);

  std::stringstream str_str;
  str_str << req.answer_.size();

  time_t ltime;
  time(&ltime);
  tm* gmt= gmtime(&ltime);

#ifdef _WIN32
  static std::string const serverName = "MCServerWebAdmin (Windows)";
#elif __APPLE__
  static std::string const serverName = "MCServerWebAdmin (MacOSX)";
#else
  static std::string const serverName = "MCServerWebAdmin (Linux)";
#endif


  char* asctime_remove_nl = std::asctime(gmt);
  asctime_remove_nl[24] = 0;

  s->SendBytes("HTTP/1.1 ");

  if (! req.auth_realm_.empty() ) {
    s->SendLine("401 Unauthorized");
    s->SendBytes("WWW-Authenticate: Basic Realm=\"");
    s->SendBytes(req.auth_realm_);
    s->SendLine("\"");
  }
  else {
    s->SendLine(req.status_);
  }
  s->SendLine(std::string("Date: ") + asctime_remove_nl + " GMT");
  s->SendLine(std::string("Server: ") +serverName);
  s->SendLine("Connection: close");
  s->SendLine("Content-Type: text/html; charset=ISO-8859-1");
  s->SendLine("Content-Length: " + str_str.str());
  s->SendLine("");
  s->SendLine(req.answer_);

  s->Close();
  delete s;


  return 0;
}

void webserver::Stop()
{
	m_bStop = true;
	m_Socket->Close();
	m_Event->Wait();
}

void webserver::Begin()
{
	m_bStop = false;
	while ( !m_bStop )
	{
		Socket* ptr_s=m_Socket->Accept();
		if( m_bStop )
		{
			if( ptr_s != 0 )
			{
				ptr_s->Close();
				delete ptr_s;
			}
			break;
		}

		// unused variable 'ret'
		//_beginthreadex(0,0,Request,(void*) ptr_s,0,&ret);
		// Thanks to Frank M. Hoffmann for fixing a HANDLE leak
		#ifdef _WIN32
		unsigned ret;
		HANDLE hHandle = reinterpret_cast<HANDLE>(_beginthreadex(0,0,Request,(void*) ptr_s,0,&ret));
		CloseHandle(hHandle);
		#else
		pthread_t* hHandle = new pthread_t;
		pthread_create( hHandle, NULL, Request, ptr_s);
		#endif
	}
	m_Event->Set();
}

webserver::webserver(unsigned int port_to_listen, request_func r) {
  m_Socket = new SocketServer(port_to_listen,1);

  request_func_ = r;
  m_Event = new cEvent();
}

webserver::~webserver()
{
	delete m_Socket;
	delete m_Event;
}