text: # -*- coding: utf-8 -*-
  #
  # Copyright (C) 2006 Edgewall Software
  # All rights reserved.
  #
  # This software is licensed as described in the file COPYING, which
  # you should have received as part of this distribution. The terms
  # are also available at http://trac.edgewall.com/license.html.
  #
  # This software consists of voluntary contributions made by many
  # individuals. For the exact contribution history, see the revision
  # history and logs, available at http://projects.edgewall.com/trac/.
  
  from email.utils import parseaddr
  
  from trac.config import IntOption
  from trac.core import Component, implements
  
  from tracspamfilter.api import IFilterStrategy, N_
  
  
  class SessionFilterStrategy(Component):
      """This strategy grants positive karma points to users with an existing
      session, and extra points if they've set up their user name and password."""
  
      implements(IFilterStrategy)
  
      karma_points = IntOption('spam-filter', 'session_karma', '6',
          """By how many points an existing and configured session improves the
          overall karma of the submission. A third of the points is granted for
          having an existing session at all, the other two thirds are granted
          when the user has his name and/or email address set in the session,
          respectively.""", doc_domain="tracspamfilter")
  
      # IFilterStrategy implementation
  
      def is_external(self):
          return False
  
      def test(self, req, author, content, ip):
          points = 0
          if req.session.last_visit:
              points += abs(self.karma_points) / 3
              if req.session.get('name'):
                  points += abs(self.karma_points) / 3
              if req.session.get('email'):
                  email = parseaddr(req.session.get('email'))[1]
                  if email and '@' in email:
                      points += abs(self.karma_points) / 3
              return points, N_('Existing session found')
  
      def train(self, req, author, content, ip, spam=True):
          return 0
  