| 1 | # -*- coding: utf-8 -*-
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| 2 | #
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| 3 | # Copyright (C) 2012 Dirk Stöcker <trac@dstoecker.de>
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| 4 | # All rights reserved.
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| 5 | #
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| 6 | # This software is licensed as described in the file COPYING, which
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| 7 | # you should have received as part of this distribution. The terms
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| 8 | # are also available at http://trac.edgewall.com/license.html.
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| 9 | #
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| 10 | # This software consists of voluntary contributions made by many
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| 11 | # individuals. For the exact contribution history, see the revision
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| 12 | # history and logs, available at http://projects.edgewall.com/trac/.
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| 13 |
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| 14 | from genshi.filters.transform import Transformer
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| 15 | from trac.config import IntOption, Option
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| 16 | from trac.core import Component, implements
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| 17 | from trac.util.html import html as tag
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| 18 | from trac.util.text import javascript_quote, shorten_line
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| 19 | from trac.web.api import ITemplateStreamFilter
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| 20 |
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| 21 | from tracspamfilter.api import IFilterStrategy, N_
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| 22 |
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| 23 |
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| 24 | class TrapFieldFilterStrategy(Component):
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| 25 | """Spam filter using a hidden trap field.
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| 26 | """
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| 27 | implements(IFilterStrategy, ITemplateStreamFilter)
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| 28 |
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| 29 | karma_points = IntOption('spam-filter', 'trap_karma', '10',
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| 30 | """By how many points a trap reject impacts the overall karma of
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| 31 | a submission.""", doc_domain='tracspamfilter')
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| 32 |
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| 33 | name = Option('spam-filter', 'trap_name', 'sfp_email',
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| 34 | """Name of the invisible trap field, should contain some reference
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| 35 | to e-mail for better results.""", doc_domain='tracspamfilter')
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| 36 |
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| 37 | name_hidden = Option('spam-filter', 'trap_name_hidden', 'sfph_mail',
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| 38 | """Name of the hidden trap field, should contain some reference
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| 39 | to e-mail for better results.""", doc_domain='tracspamfilter')
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| 40 |
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| 41 | name_register = Option('spam-filter', 'trap_name_register', 'spf_homepage',
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| 42 | """Name of the register trap field, should contain some reference
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| 43 | to web/homepage for better results.""", doc_domain='tracspamfilter')
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| 44 |
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| 45 | # IFilterStrategy implementation
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| 46 |
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| 47 | def is_external(self):
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| 48 | return False
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| 49 |
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| 50 | def get_trap(self, req):
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| 51 | i = req.args.getfirst(self.name)
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| 52 | h = req.args.getfirst(self.name_hidden)
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| 53 | if i and h and i != h:
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| 54 | return i + "\n" + h
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| 55 | elif h:
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| 56 | return h
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| 57 | return i
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| 58 |
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| 59 | def test(self, req, author, content, ip):
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| 60 | i = req.args.getfirst(self.name)
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| 61 | h = req.args.getfirst(self.name_hidden)
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| 62 | r = self.getlink(req)
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| 63 |
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| 64 | if i and h:
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| 65 | i = shorten_line(javascript_quote(i), 50)
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| 66 | h = shorten_line(javascript_quote(h), 50)
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| 67 | return -abs(self.karma_points), \
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| 68 | N_("Both trap fields says this is spam (%s, %s)"), i, h
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| 69 | elif i:
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| 70 | i = shorten_line(javascript_quote(i), 50)
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| 71 | return -abs(self.karma_points), \
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| 72 | N_("Invisible trap field says this is spam (%s)"), i
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| 73 | elif h:
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| 74 | h = shorten_line(javascript_quote(h), 50)
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| 75 | return -abs(self.karma_points), \
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| 76 | N_("Hidden trap field says this is spam (%s)"), h
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| 77 | elif r:
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| 78 | r = shorten_line(javascript_quote(r), 50)
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| 79 | return -abs(self.karma_points), \
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| 80 | N_("Register trap field starts with HTTP URL (%s)"), r
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| 81 |
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| 82 | def getlink(self, req):
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| 83 | r = req.args.getfirst(self.name_register)
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| 84 | if not (r and (r.startswith('http://') or r.startswith('https://'))):
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| 85 | return None
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| 86 | return r
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| 87 |
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| 88 | def train(self, req, author, content, ip, spam=True):
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| 89 | return 0
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| 90 |
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| 91 | # ITemplateStreamFilter interface
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| 92 | def filter_stream(self, req, method, filename, stream, data):
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| 93 | if self.karma_points > 0:
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| 94 | # Insert the hidden field right before the submit buttons
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| 95 | trap = tag.div(style='display:none;')(
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| 96 | tag.input(type='text', name=self.name, value=''),
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| 97 | tag.input(type='hidden', name=self.name_hidden, value=''))
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| 98 | stream = stream | \
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| 99 | Transformer('//div[@class="buttons"]').before(trap)
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| 100 | return stream
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