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authorBarry Warsaw2009-01-25 13:01:41 -0500
committerBarry Warsaw2009-01-25 13:01:41 -0500
commiteefd06f1b88b8ecbb23a9013cd223b72ca85c20d (patch)
tree72c947fe16fce0e07e996ee74020b26585d7e846 /mailman/rules/implicit_dest.py
parent07871212f74498abd56bef3919bf3e029eb8b930 (diff)
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diff --git a/mailman/rules/implicit_dest.py b/mailman/rules/implicit_dest.py
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-# Copyright (C) 2007-2009 by the Free Software Foundation, Inc.
-#
-# This file is part of GNU Mailman.
-#
-# GNU Mailman 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 3 of the License, or (at your option)
-# any later version.
-#
-# GNU Mailman 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
-# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
-
-"""The implicit destination rule."""
-
-from __future__ import absolute_import, unicode_literals
-
-__metaclass__ = type
-__all__ = [
- 'ImplicitDestination',
- ]
-
-
-import re
-from email.utils import getaddresses
-from zope.interface import implements
-
-from mailman.i18n import _
-from mailman.interfaces.rules import IRule
-
-
-
-class ImplicitDestination:
- """The implicit destination rule."""
- implements(IRule)
-
- name = 'implicit-dest'
- description = _('Catch messages with implicit destination.')
- record = True
-
- def check(self, mlist, msg, msgdata):
- """See `IRule`."""
- # Implicit destination checking must be enabled in the mailing list.
- if not mlist.require_explicit_destination:
- return False
- # Messages gated from NNTP will always have an implicit destination so
- # are never checked.
- if msgdata.get('fromusenet'):
- return False
- # Calculate the list of acceptable aliases. If the alias starts with
- # a caret (i.e. ^), then it's a regular expression to match against.
- aliases = set()
- alias_patterns = set()
- for alias in mlist.acceptable_aliases.splitlines():
- alias = alias.strip().lower()
- if alias.startswith('^'):
- alias_patterns.add(alias)
- elif '@' in alias:
- aliases.add(alias)
- else:
- # This is not a regular expression, nor a fully-qualified
- # email address, so skip it.
- pass
- # Add the list's posting address, i.e. the explicit address, to the
- # set of acceptable aliases.
- aliases.add(mlist.posting_address)
- # Look at all the recipients. If the recipient is any acceptable
- # alias (or the explicit posting address), then this rule does not
- # match. If not, then add it to the set of recipients we'll check
- # against the alias patterns later.
- recipients = set()
- for header in ('to', 'cc', 'resent-to', 'resent-cc'):
- for fullname, address in getaddresses(msg.get_all(header, [])):
- address = address.lower()
- if address in aliases:
- return False
- recipients.add(address)
- # Now for all alias patterns, see if any of the recipients matches a
- # pattern. If so, then this rule does not match.
- for pattern in alias_patterns:
- escaped = re.escape(pattern)
- for recipient in recipients:
- try:
- if re.match(pattern, recipient, re.IGNORECASE):
- return False
- except re.error:
- # The pattern is a malformed regular expression. Try
- # matching again with the pattern escaped.
- try:
- if re.match(escaped, recipient, re.IGNORECASE):
- return False
- except re.error:
- pass
- # Nothing matched.
- return True