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# Copyright (C) 2007-2017 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 default built-in starting chain."""
import logging
from mailman.chains.base import Link
from mailman.core.i18n import _
from mailman.interfaces.chain import IChain, LinkAction
from public import public
from zope.interface import implementer
log = logging.getLogger('mailman.vette')
@public
@implementer(IChain)
class BuiltInChain:
"""Default built-in chain."""
name = 'default-posting-chain'
description = _('The built-in moderation chain.')
_link_descriptions = (
# First check DMARC. For a reject or discard, the rule hits and we
# jump to the moderation chain to do the action. Otherwise, the rule
# misses buts sets msgdata['dmarc'] for the handler.
('dmarc-mitigation', LinkAction.jump, 'moderation'),
('approved', LinkAction.jump, 'accept'),
('emergency', LinkAction.jump, 'hold'),
('loop', LinkAction.jump, 'discard'),
# Discard emails from banned addresses.
('banned-address', LinkAction.jump, 'discard'),
# Determine whether the member or nonmember has an action shortcut.
('member-moderation', LinkAction.jump, 'moderation'),
# Take a detour through the header matching chain.
('truth', LinkAction.detour, 'header-match'),
# Check for nonmember moderation.
('nonmember-moderation', LinkAction.jump, 'moderation'),
# Do all of the following before deciding whether to hold the message.
('administrivia', LinkAction.defer, None),
('implicit-dest', LinkAction.defer, None),
('max-recipients', LinkAction.defer, None),
('max-size', LinkAction.defer, None),
('news-moderation', LinkAction.defer, None),
('no-subject', LinkAction.defer, None),
('suspicious-header', LinkAction.defer, None),
# Now if any of the above hit, jump to the hold chain.
('any', LinkAction.jump, 'hold'),
# Finally, the builtin chain jumps to acceptance.
('truth', LinkAction.jump, 'accept'),
)
def __init__(self):
self._cached_links = None
def get_links(self, mlist, msg, msgdata):
"""See `IChain`."""
if self._cached_links is None:
self._cached_links = links = []
for rule, action, chain in self._link_descriptions:
links.append(Link(rule, action, chain))
return iter(self._cached_links)
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