def do_POST(self):
    ''' Respond to POST request.'''
    # Extract and print the contents of the POST
    logging.debug('Received post request at '+self.path)

    recvTime  = int(time.time())
    length    = int(self.headers['Content-Length'])
    post_data = urlparse.parse_qs(self.rfile.read(length).decode('utf-8'))
    teamname  = post_data['teamname'][0]
    teampass  = post_data['teampassword'][0]

    if self.path=='/submit':

      problemNo = post_data['problemnumber'][0]
      filename  = post_data['filename'][0]

      try:
        filedata  = b64decode(post_data['filedata'][0])
      except Exception as e:
        logging.info ('Caught exception %s', e)
        self.do_HEAD()
        self.wfile.write(FILEDATA_MISSING)
        return

      logging.debug('Post request details :\t' + 
                  'teamname  = %s ;;' + 
                  'teampass  = %s ;;' +
                  'problemNo = %s ;;' + 
                  'filename  = %s ;;', teamname, teampass, problemNo, filename)

      if not db.authenticate(teamname, teampass):
        self.do_HEAD()
        self.wfile.write(INVALID_AUTHENTICATION)
        return

      # Check if the folder for the user exists
      folder = os.path.join(TEMP_DIR, teamname, problemNo)
      if not os.path.exists(folder):
        os.makedirs(folder)
      # Create filename using the folder information
      filename = os.path.join(folder, filename)

      # Dump data into file
      self.dumpFile(filename, filedata)

      score = 0
      # Judge solution
      try:
        score, errors = judge (problemNo, filename)
      except NoSuchProblemException as e:
        self.do_HEAD()
        self.wfile.write(INVALID_PROBLEM)
        logging.debug(str(e))
        return      
    
      # Rename file so as to be able to keep older versions.
      newfilename = filename + str(recvTime)
      os.rename(filename, newfilename)
  
      db.updateSubmissions(teamname, problemNo, recvTime, newfilename, score, errors)

      # Return evaluation results
      self.do_HEAD()
      self.wfile.write("Score earned for solution : " + str(score))
      if errors:
        self.wfile.write("\nErrors\n" + errors)
      return

    elif self.path == '/leaderboard':
      self.do_HEAD()
      leaderboard = db.getLeaderboard()
      self.wfile.write(leaderboard)
      return

    elif self.path == '/score':
      if not db.authenticate(teamname, teampass):
        self.do_HEAD()
        self.wfile.write(INVALID_AUTHENTICATION)
        return

      self.do_HEAD()
      scores = db.getScores(teamname)
      self.wfile.write(scores)
 def do_GET(self):
   logging.debug('Received get request at '+self.path)
   self.do_HEAD()
   leaderboard = db.getLeaderboard().replace("\n", "<BR />").replace("\t", "    ")
   self.wfile.write(leaderboard)
   return