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# -*- 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/.
import re
from trac.config import IntOption
from trac.core import *
from tracspamfilter.api import IFilterStrategy
from tracspamfilter.model import LogEntry
class ExternalLinksFilterStrategy(Component):
"""Spam filter strategy that reduces the karma of a submission if the
content contains too many links to external sites.
"""
implements(IFilterStrategy)
karma_points = IntOption('spam-filter', 'extlinks_karma', '2',
"""By how many points too many external links in a submission impact
the overall score.""")
max_links = IntOption('spam-filter', 'max_external_links', '4',
"""The maximum number of external links allowed in a submission until
that submission gets negative karma.""")
_URL_RE = re.compile('https?://([^/]+)/?', re.IGNORECASE)
# IFilterStrategy methods
def test(self, req, author, content):
num_ext = 0
for host in self._URL_RE.findall(content):
if host != req.get_header('Host'):
num_ext += 1
if num_ext > self.max_links:
return -abs(self.karma_points) * num_ext / self.max_links, \
'Maximum number of external links per post exceeded'
def train(self, req, author, content, spam=True):
pass
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