/*
 *      Copyright (C) 2005-2012 Team XBMC
 *      http://www.xbmc.org
 *
 *  This Program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This Program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with XBMC; see the file COPYING.  If not, see
 *  <http://www.gnu.org/licenses/>.
 *
 */

#include "WebServer.h"
#ifdef HAS_WEB_SERVER
#include "filesystem/File.h"
#include "utils/log.h"
#include "utils/StringUtils.h"
#include "utils/URIUtils.h"
#include "utils/Variant.h"
#include "utils/Base64.h"
#include "threads/SingleLock.h"
#include "XBDateTime.h"
#include "URL.h"

#ifdef _WIN32
#pragma comment(lib, "libmicrohttpd.dll.lib")
#endif

#define MAX_POST_BUFFER_SIZE 2048

#define PAGE_FILE_NOT_FOUND "<html><head><title>File not found</title></head><body>File not found</body></html>"
#define NOT_SUPPORTED       "<html><head><title>Not Supported</title></head><body>The method you are trying to use is not supported by this server</body></html>"

using namespace XFILE;
using namespace std;
using namespace JSONRPC;

vector<IHTTPRequestHandler *> CWebServer::m_requestHandlers;

CWebServer::CWebServer()
{
  m_running = false;
  m_daemon = NULL;
  m_needcredentials = true;
  m_Credentials64Encoded = "eGJtYzp4Ym1j"; // xbmc:xbmc
}

int CWebServer::FillArgumentMap(void *cls, enum MHD_ValueKind kind, const char *key, const char *value) 
{
  if (cls == NULL || key == NULL)
    return MHD_NO;

  map<string, string> *arguments = (map<string, string> *)cls;
  arguments->insert(pair<string, string>(key, value != NULL ? value : StringUtils::Empty));
  return MHD_YES; 
}

int CWebServer::FillArgumentMultiMap(void *cls, enum MHD_ValueKind kind, const char *key, const char *value) 
{
  if (cls == NULL || key == NULL)
    return MHD_NO;

  multimap<string, string> *arguments = (multimap<string, string> *)cls;
  arguments->insert(pair<string, string>(key, value != NULL ? value : StringUtils::Empty));
  return MHD_YES; 
}

int CWebServer::AskForAuthentication(struct MHD_Connection *connection)
{
  int ret;
  struct MHD_Response *response;

  response = MHD_create_response_from_data (0, NULL, MHD_NO, MHD_NO);
  if (!response)
    return MHD_NO;

  ret = MHD_add_response_header(response, MHD_HTTP_HEADER_WWW_AUTHENTICATE, "Basic realm=XBMC");
  ret |= MHD_add_response_header(response, MHD_HTTP_HEADER_CONNECTION, "close");
  if (!ret)
  {
    MHD_destroy_response (response);
    return MHD_NO;
  }

  ret = MHD_queue_response (connection, MHD_HTTP_UNAUTHORIZED, response);

  MHD_destroy_response (response);

  return ret;
}

bool CWebServer::IsAuthenticated(CWebServer *server, struct MHD_Connection *connection)
{
  CSingleLock lock (server->m_critSection);
  if (!server->m_needcredentials)
    return true;

  const char *strbase = "Basic ";
  const char *headervalue = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Authorization");
  if (NULL == headervalue)
    return false;
  if (strncmp (headervalue, strbase, strlen(strbase)))
    return false;

  return (server->m_Credentials64Encoded.compare(headervalue + strlen(strbase)) == 0);
}

#if (MHD_VERSION >= 0x00040001)
int CWebServer::AnswerToConnection(void *cls, struct MHD_Connection *connection,
                      const char *url, const char *method,
                      const char *version, const char *upload_data,
                      size_t *upload_data_size, void **con_cls)
#else
int CWebServer::AnswerToConnection(void *cls, struct MHD_Connection *connection,
                      const char *url, const char *method,
                      const char *version, const char *upload_data,
                      unsigned int *upload_data_size, void **con_cls)
#endif
{
  CWebServer *server = (CWebServer *)cls;
  HTTPMethod methodType = GetMethod(method);
  HTTPRequest request = { connection, url, methodType, version, server };

  if (!IsAuthenticated(server, connection)) 
    return AskForAuthentication(connection);

  // Check if this is the first call to
  // AnswerToConnection for this request
  if (*con_cls == NULL)
  {
    // Look for a IHTTPRequestHandler which can
    // take care of the current request
    for (vector<IHTTPRequestHandler *>::const_iterator it = m_requestHandlers.begin(); it != m_requestHandlers.end(); it++)
    {
      IHTTPRequestHandler *requestHandler = *it;
      if (requestHandler->CheckHTTPRequest(request))
      {
        // We found a matching IHTTPRequestHandler
        // so let's get a new instance for this request
        IHTTPRequestHandler *handler = requestHandler->GetInstance();

        // If we got a POST request we need to take
        // care of the POST data
        if (methodType == POST)
        {
          ConnectionHandler *conHandler = new ConnectionHandler();
          conHandler->requestHandler = handler;

          // Get the content-type of the POST data
          string contentType = GetRequestHeaderValue(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_CONTENT_TYPE);
          if (!contentType.empty())
          {
            // If the content-type is application/x-ww-form-urlencoded or multipart/form-data
            // we can use MHD's POST processor
            if (stricmp(contentType.c_str(), MHD_HTTP_POST_ENCODING_FORM_URLENCODED) == 0 ||
                stricmp(contentType.c_str(), MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA) == 0)
            {
              // Get a new MHD_PostProcessor
              conHandler->postprocessor = MHD_create_post_processor(connection, MAX_POST_BUFFER_SIZE, &CWebServer::HandlePostField, (void*)conHandler);

              // MHD doesn't seem to be able to handle
              // this post request
              if (conHandler->postprocessor == NULL)
              {
                delete conHandler->requestHandler;
                delete conHandler;

                return SendErrorResponse(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, methodType);
              }
            }
          }
          // otherwise we need to handle the POST data ourselves
          // which is done in the next call to AnswerToConnection

          *con_cls = (void*)conHandler;
          return MHD_YES;
        }
        // No POST request so nothing special to handle
        else
          return HandleRequest(handler, request);
      }
    }
  }
  // This is a subsequent call to
  // AnswerToConnection for this request
  else
  {
    // Again we need to take special care
    // of the POST data
    if (methodType == POST)
    {
      ConnectionHandler *conHandler = (ConnectionHandler *)*con_cls;
      if (conHandler->requestHandler == NULL)
        return SendErrorResponse(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, methodType);

      // We only need to handle POST data
      // if there actually is data left to handle
      if (*upload_data_size > 0)
      {
        // Either use MHD's POST processor
        if (conHandler->postprocessor != NULL)
          MHD_post_process(conHandler->postprocessor, upload_data, *upload_data_size);
        // or simply copy the data to the handler
        else
          conHandler->requestHandler->AddPostData(upload_data, *upload_data_size);

        // Signal that we have handled the data
        *upload_data_size = 0;

        return MHD_YES;
      }
      // We have handled all POST data
      // so it's time to invoke the IHTTPRequestHandler
      else
      {
        if (conHandler->postprocessor != NULL)
          MHD_destroy_post_processor(conHandler->postprocessor);
        *con_cls = NULL;

        int ret = HandleRequest(conHandler->requestHandler, request);
        delete conHandler;
        return ret;
      }
    }
    // It's unusual to get more than one call
    // to AnswerToConnection for none-POST
    // requests, but let's handle it anyway
    else
    {
      for (vector<IHTTPRequestHandler *>::const_iterator it = m_requestHandlers.begin(); it != m_requestHandlers.end(); it++)
      {
        IHTTPRequestHandler *requestHandler = *it;
        if (requestHandler->CheckHTTPRequest(request))
          return HandleRequest(requestHandler->GetInstance(), request);
      }
    }
  }

  return SendErrorResponse(connection, MHD_HTTP_NOT_FOUND, methodType);
}

#if (MHD_VERSION >= 0x00040001)
int CWebServer::HandlePostField(void *cls, enum MHD_ValueKind kind, const char *key,
                                const char *filename, const char *content_type,
                                const char *transfer_encoding, const char *data, uint64_t off,
                                size_t size)
#else
int CWebServer::HandlePostField(void *cls, enum MHD_ValueKind kind, const char *key,
                                const char *filename, const char *content_type,
                                const char *transfer_encoding, const char *data, uint64_t off,
                                unsigned int size)
#endif
{
  ConnectionHandler *conHandler = (ConnectionHandler *)cls;

  if (conHandler == NULL || conHandler->requestHandler == NULL || size == 0)
    return MHD_NO;

  conHandler->requestHandler->AddPostField(key, string(data, size));
  return MHD_YES;
}

int CWebServer::HandleRequest(IHTTPRequestHandler *handler, const HTTPRequest &request)
{
  if (handler == NULL)
    return SendErrorResponse(request.connection, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);

  int ret = handler->HandleHTTPRequest(request);
  if (ret == MHD_NO)
  {
    delete handler;
    return SendErrorResponse(request.connection, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
  }

  struct MHD_Response *response = NULL;
  int responseCode = handler->GetHTTPResonseCode();
  switch (handler->GetHTTPResponseType())
  {
    case HTTPNone:
      delete handler;
      return MHD_NO;

    case HTTPRedirect:
      ret = CreateRedirect(request.connection, handler->GetHTTPRedirectUrl(), response);
      break;

    case HTTPFileDownload:
      ret = CreateFileDownloadResponse(request.connection, handler->GetHTTPResponseFile(), request.method, response, responseCode);
      break;

    case HTTPMemoryDownloadNoFreeNoCopy:
      ret = CreateMemoryDownloadResponse(request.connection, handler->GetHTTPResponseData(), handler->GetHTTPResonseDataLength(), false, false, response);
      break;

    case HTTPMemoryDownloadNoFreeCopy:
      ret = CreateMemoryDownloadResponse(request.connection, handler->GetHTTPResponseData(), handler->GetHTTPResonseDataLength(), false, true, response);
      break;

    case HTTPMemoryDownloadFreeNoCopy:
      ret = CreateMemoryDownloadResponse(request.connection, handler->GetHTTPResponseData(), handler->GetHTTPResonseDataLength(), true, false, response);
      break;

    case HTTPMemoryDownloadFreeCopy:
      ret = CreateMemoryDownloadResponse(request.connection, handler->GetHTTPResponseData(), handler->GetHTTPResonseDataLength(), true, true, response);
      break;

    case HTTPError:
      ret = CreateErrorResponse(request.connection, handler->GetHTTPResonseCode(), request.method, response);
      break;

    default:
      delete handler;
      return SendErrorResponse(request.connection, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
  }

  if (ret == MHD_NO)
  {
    delete handler;
    return SendErrorResponse(request.connection, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
  }

  multimap<string, string> header = handler->GetHTTPResponseHeaderFields();
  for (multimap<string, string>::const_iterator it = header.begin(); it != header.end(); it++)
    MHD_add_response_header(response, it->first.c_str(), it->second.c_str());

  MHD_queue_response(request.connection, responseCode, response);
  MHD_destroy_response(response);
  delete handler;

  return MHD_YES;
}

HTTPMethod CWebServer::GetMethod(const char *method)
{
  if (strcmp(method, "GET") == 0)
    return GET;
  if (strcmp(method, "POST") == 0)
    return POST;
  if (strcmp(method, "HEAD") == 0)
    return HEAD;

  return UNKNOWN;
}

int CWebServer::CreateRedirect(struct MHD_Connection *connection, const string &strURL, struct MHD_Response *&response)
{
  response = MHD_create_response_from_data (0, NULL, MHD_NO, MHD_NO);
  if (response)
  {
    MHD_add_response_header(response, "Location", strURL.c_str());
    return MHD_YES;
  }
  return MHD_NO;
}

int CWebServer::CreateFileDownloadResponse(struct MHD_Connection *connection, const string &strURL, HTTPMethod methodType, struct MHD_Response *&response, int &responseCode)
{
  CFile *file = new CFile();

  if (file->Open(strURL, READ_NO_CACHE))
  {
    bool getData = true;
    if (methodType != HEAD)
    {
      if (methodType == GET)
      {
        string ifModifiedSince = GetRequestHeaderValue(connection, MHD_HEADER_KIND, "If-Modified-Since");
        if (!ifModifiedSince.empty())
        {
          CDateTime ifModifiedSinceDate;
          ifModifiedSinceDate.SetFromRFC1123DateTime(ifModifiedSince);

          struct __stat64 statBuffer;
          if (file->Stat(&statBuffer) == 0)
          {
            struct tm *time = localtime((time_t *)&statBuffer.st_mtime);
            if (time != NULL)
            {
              CDateTime lastModified = *time;
              if (lastModified.GetAsUTCDateTime() <= ifModifiedSinceDate)
              {
                getData = false;
                response = MHD_create_response_from_data (0, NULL, MHD_NO, MHD_NO);
                responseCode = MHD_HTTP_NOT_MODIFIED;
              }
            }
          }
        }
      }

      if (getData)
        response = MHD_create_response_from_callback(file->GetLength(),
                                                     2048,
                                                     &CWebServer::ContentReaderCallback, file,
                                                     &CWebServer::ContentReaderFreeCallback);
      if (response == NULL)
      {
        file->Close();
        delete file;
        return MHD_NO;
      }
    }
    else
    {
      getData = false;

      CStdString contentLength;
      contentLength.Format("%I64d", file->GetLength());

      response = MHD_create_response_from_data (0, NULL, MHD_NO, MHD_NO);
      if (response == NULL)
      {
        file->Close();
        delete file;
        return MHD_NO;
      }
      MHD_add_response_header(response, "Content-Length", contentLength);
    }

    // set the Content-Type header
    CStdString ext = URIUtils::GetExtension(strURL);
    ext = ext.ToLower();
    const char *mime = CreateMimeTypeFromExtension(ext.c_str());
    if (mime)
      MHD_add_response_header(response, "Content-Type", mime);

    // set the Last-Modified header
    struct __stat64 statBuffer;
    if (file->Stat(&statBuffer) == 0)
    {
      struct tm *time = localtime((time_t *)&statBuffer.st_mtime);
      if (time != NULL)
      {
        CDateTime lastModified = *time;
        MHD_add_response_header(response, "Last-Modified", lastModified.GetAsRFC1123DateTime());
      }
    }

    // set the Expires header
    CDateTime expiryTime = CDateTime::GetCurrentDateTime();
    if (mime && strncmp(mime, "text/html", 9) == 0)
      expiryTime += CDateTimeSpan(1, 0, 0, 0);
    else
      expiryTime += CDateTimeSpan(365, 0, 0, 0);
    MHD_add_response_header(response, "Expires", expiryTime.GetAsRFC1123DateTime());

    // only close the CFile instance if libmicrohttpd doesn't have to grab the data of the file
    if (!getData)
    {
      file->Close();
      delete file;
    }
  }
  else
  {
    delete file;
    CLog::Log(LOGERROR, "WebServer: Failed to open %s", strURL.c_str());
    return SendErrorResponse(connection, MHD_HTTP_NOT_FOUND, GET); /* GET Assumed Temporarily */
  }
  return MHD_YES;
}

int CWebServer::CreateErrorResponse(struct MHD_Connection *connection, int responseType, HTTPMethod method, struct MHD_Response *&response)
{
  size_t payloadSize = 0;
  void *payload = NULL;

  if (method != HEAD)
  {
    switch (responseType)
    {
      case MHD_HTTP_NOT_FOUND:
        payloadSize = strlen(PAGE_FILE_NOT_FOUND);
        payload = (void *)PAGE_FILE_NOT_FOUND;
        break;
      case MHD_HTTP_NOT_IMPLEMENTED:
        payloadSize = strlen(NOT_SUPPORTED);
        payload = (void *)NOT_SUPPORTED;
        break;
    }
  }

  response = MHD_create_response_from_data (payloadSize, payload, MHD_NO, MHD_NO);
  if (response)
    return MHD_YES;
  return MHD_NO;
}

int CWebServer::CreateMemoryDownloadResponse(struct MHD_Connection *connection, void *data, size_t size, bool free, bool copy, struct MHD_Response *&response)
{
  response = MHD_create_response_from_data (size, data, free ? MHD_YES : MHD_NO, copy ? MHD_YES : MHD_NO);
  if (response)
    return MHD_YES;
  return MHD_NO;
}

int CWebServer::SendErrorResponse(struct MHD_Connection *connection, int errorType, HTTPMethod method)
{
  struct MHD_Response *response = NULL;
  int ret = CreateErrorResponse(connection, errorType, method, response);
  if (ret == MHD_YES)
  {
    ret = MHD_queue_response (connection, errorType, response);
    MHD_destroy_response (response);
  }

  return ret;
}

void* CWebServer::UriRequestLogger(void *cls, const char *uri)
{
  CLog::Log(LOGDEBUG, "webserver: request received for %s", uri);
  return NULL;
}

#if (MHD_VERSION >= 0x00090200)
ssize_t CWebServer::ContentReaderCallback (void *cls, uint64_t pos, char *buf, size_t max)
#elif (MHD_VERSION >= 0x00040001)
int CWebServer::ContentReaderCallback(void *cls, uint64_t pos, char *buf, int max)
#else   //libmicrohttpd < 0.4.0
int CWebServer::ContentReaderCallback(void *cls, size_t pos, char *buf, int max)
#endif
{
  CFile *file = (CFile *)cls;
  if((unsigned int)pos != file->GetPosition())
    file->Seek(pos);
  unsigned res = file->Read(buf, max);
  if(res == 0)
    return -1;
  return res;
}

void CWebServer::ContentReaderFreeCallback(void *cls)
{
  CFile *file = (CFile *)cls;
  file->Close();

  delete file;
}

struct MHD_Daemon* CWebServer::StartMHD(unsigned int flags, int port)
{
  // WARNING: when using MHD_USE_THREAD_PER_CONNECTION, set MHD_OPTION_CONNECTION_TIMEOUT to something higher than 1
  // otherwise on libmicrohttpd 0.4.4-1 it spins a busy loop

  unsigned int timeout = 60 * 60 * 24;
  // MHD_USE_THREAD_PER_CONNECTION = one thread per connection
  // MHD_USE_SELECT_INTERNALLY = use main thread for each connection, can only handle one request at a time [unless you set the thread pool size]

  return MHD_start_daemon(flags,
                          port,
                          NULL,
                          NULL,
                          &CWebServer::AnswerToConnection,
                          this,
#if (MHD_VERSION >= 0x00040002)
                          MHD_OPTION_THREAD_POOL_SIZE, 4,
#endif
                          MHD_OPTION_CONNECTION_LIMIT, 512,
                          MHD_OPTION_CONNECTION_TIMEOUT, timeout,
                          MHD_OPTION_URI_LOG_CALLBACK, &CWebServer::UriRequestLogger, this,
                          MHD_OPTION_END);
}

bool CWebServer::Start(int port, const string &username, const string &password)
{
  SetCredentials(username, password);
  if (!m_running)
  {
    m_daemon = StartMHD(MHD_USE_SELECT_INTERNALLY, port);

    m_running = m_daemon != NULL;
    if (m_running)
      CLog::Log(LOGNOTICE, "WebServer: Started the webserver");
    else
      CLog::Log(LOGERROR, "WebServer: Failed to start the webserver");
  }
  return m_running;
}

bool CWebServer::Stop()
{
  if (m_running)
  {
    MHD_stop_daemon(m_daemon);
    m_running = false;
    CLog::Log(LOGNOTICE, "WebServer: Stopped the webserver");
  } else 
    CLog::Log(LOGNOTICE, "WebServer: Stopped failed because its not running");

  return !m_running;
}

bool CWebServer::IsStarted()
{
  return m_running;
}

void CWebServer::SetCredentials(const string &username, const string &password)
{
  CSingleLock lock (m_critSection);
  CStdString str = username + ":" + password;

  Base64::Encode(str.c_str(), m_Credentials64Encoded);
  m_needcredentials = !password.empty();
}

bool CWebServer::PrepareDownload(const char *path, CVariant &details, std::string &protocol)
{
  bool exists = false;
  CFile *file = new CFile();
  if (file->Open(path))
  {
    exists = true;
    file->Close();
  }

  delete file;

  if (exists)
  {
    protocol = "http";
    string url;
    CStdString strPath = path;
    if (strPath.Left(8) == "image://" ||
       (strPath.Left(10) == "special://" && strPath.Right(4) == ".tbn"))
      url = "image/";
    else
      url = "vfs/";
    CURL::Encode(strPath);
    url += strPath;
    details["path"] = url;
  }

  return exists;
}

bool CWebServer::Download(const char *path, CVariant &result)
{
  return false;
}

int CWebServer::GetCapabilities()
{
  return Response | FileDownloadRedirect;
}

void CWebServer::RegisterRequestHandler(IHTTPRequestHandler *handler)
{
  if (handler == NULL)
    return;

  for (vector<IHTTPRequestHandler *>::iterator it = m_requestHandlers.begin(); it != m_requestHandlers.end(); it++)
  {
    if (*it == handler)
      return;

    if ((*it)->GetPriority() < handler->GetPriority())
    {
      m_requestHandlers.insert(it, handler);
      return;
    }
  }

  m_requestHandlers.push_back(handler);
}

void CWebServer::UnregisterRequestHandler(IHTTPRequestHandler *handler)
{
  if (handler == NULL)
    return;

  for (vector<IHTTPRequestHandler *>::iterator it = m_requestHandlers.begin(); it != m_requestHandlers.end(); it++)
  {
    if (*it == handler)
    {
      m_requestHandlers.erase(it);
      return;
    }
  }
}

std::string CWebServer::GetRequestHeaderValue(struct MHD_Connection *connection, enum MHD_ValueKind kind, const std::string &key)
{
  if (connection == NULL)
    return "";

  const char* value = MHD_lookup_connection_value(connection, kind, key.c_str());
  if (value == NULL)
    return "";

  if (stricmp(key.c_str(), MHD_HTTP_HEADER_CONTENT_TYPE) == 0)
  {
    // Work around a bug in firefox (see https://bugzilla.mozilla.org/show_bug.cgi?id=416178)
    // by cutting of anything that follows a ";" in a "Content-Type" header field
    string strValue(value);
    size_t pos = strValue.find(';');
    if (pos != string::npos)
      strValue = strValue.substr(0, pos);

    return strValue;
  }

  return value;
}

int CWebServer::GetRequestHeaderValues(struct MHD_Connection *connection, enum MHD_ValueKind kind, std::map<std::string, std::string> &headerValues)
{
  if (connection == NULL)
    return -1;

  return MHD_get_connection_values(connection, kind, FillArgumentMap, &headerValues);
}

int CWebServer::GetRequestHeaderValues(struct MHD_Connection *connection, enum MHD_ValueKind kind, std::multimap<std::string, std::string> &headerValues)
{
  if (connection == NULL)
    return -1;

  return MHD_get_connection_values(connection, kind, FillArgumentMultiMap, &headerValues);
}

const char *CWebServer::CreateMimeTypeFromExtension(const char *ext)
{
  if (strcmp(ext, ".aif") == 0)   return "audio/aiff";
  if (strcmp(ext, ".aiff") == 0)  return "audio/aiff";
  if (strcmp(ext, ".asf") == 0)   return "video/x-ms-asf";
  if (strcmp(ext, ".asx") == 0)   return "video/x-ms-asf";
  if (strcmp(ext, ".avi") == 0)   return "video/avi";
  if (strcmp(ext, ".avs") == 0)   return "video/avs-video";
  if (strcmp(ext, ".bin") == 0)   return "application/octet-stream";
  if (strcmp(ext, ".bmp") == 0)   return "image/bmp";
  if (strcmp(ext, ".dv") == 0)    return "video/x-dv";
  if (strcmp(ext, ".fli") == 0)   return "video/fli";
  if (strcmp(ext, ".gif") == 0)   return "image/gif";
  if (strcmp(ext, ".htm") == 0)   return "text/html";
  if (strcmp(ext, ".html") == 0)  return "text/html";
  if (strcmp(ext, ".htmls") == 0) return "text/html";
  if (strcmp(ext, ".ico") == 0)   return "image/x-icon";
  if (strcmp(ext, ".it") == 0)    return "audio/it";
  if (strcmp(ext, ".jpeg") == 0)  return "image/jpeg";
  if (strcmp(ext, ".jpg") == 0)   return "image/jpeg";
  if (strcmp(ext, ".json") == 0)  return "application/json";
  if (strcmp(ext, ".kar") == 0)   return "audio/midi";
  if (strcmp(ext, ".list") == 0)  return "text/plain";
  if (strcmp(ext, ".log") == 0)   return "text/plain";
  if (strcmp(ext, ".lst") == 0)   return "text/plain";
  if (strcmp(ext, ".m2v") == 0)   return "video/mpeg";
  if (strcmp(ext, ".m3u") == 0)   return "audio/x-mpequrl";
  if (strcmp(ext, ".mid") == 0)   return "audio/midi";
  if (strcmp(ext, ".midi") == 0)  return "audio/midi";
  if (strcmp(ext, ".mod") == 0)   return "audio/mod";
  if (strcmp(ext, ".mov") == 0)   return "video/quicktime";
  if (strcmp(ext, ".mp2") == 0)   return "audio/mpeg";
  if (strcmp(ext, ".mp3") == 0)   return "audio/mpeg3";
  if (strcmp(ext, ".mpa") == 0)   return "audio/mpeg";
  if (strcmp(ext, ".mpeg") == 0)  return "video/mpeg";
  if (strcmp(ext, ".mpg") == 0)   return "video/mpeg";
  if (strcmp(ext, ".mpga") == 0)  return "audio/mpeg";
  if (strcmp(ext, ".pcx") == 0)   return "image/x-pcx";
  if (strcmp(ext, ".png") == 0)   return "image/png";
  if (strcmp(ext, ".rm") == 0)    return "audio/x-pn-realaudio";
  if (strcmp(ext, ".s3m") == 0)   return "audio/s3m";
  if (strcmp(ext, ".sid") == 0)   return "audio/x-psid";
  if (strcmp(ext, ".tif") == 0)   return "image/tiff";
  if (strcmp(ext, ".tiff") == 0)  return "image/tiff";
  if (strcmp(ext, ".txt") == 0)   return "text/plain";
  if (strcmp(ext, ".uni") == 0)   return "text/uri-list";
  if (strcmp(ext, ".viv") == 0)   return "video/vivo";
  if (strcmp(ext, ".wav") == 0)   return "audio/wav";
  if (strcmp(ext, ".xm") == 0)    return "audio/xm";
  if (strcmp(ext, ".xml") == 0)   return "text/xml";
  if (strcmp(ext, ".zip") == 0)   return "application/zip";
  if (strcmp(ext, ".tbn") == 0)   return "image/jpeg";
  if (strcmp(ext, ".js") == 0)    return "application/javascript";
  if (strcmp(ext, ".css") == 0)   return "text/css";
  return NULL;
}
#endif
