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# Copyright (C) 2007-2008 by the Free Software Foundation, Inc.
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
"""The default built-in starting chain."""
__all__ = ['BuiltInChain']
__metaclass__ = type
import logging
from zope.interface import implements
from mailman.chains.base import Link
from mailman.configuration import config
from mailman.i18n import _
from mailman.interfaces import IChain, LinkAction
log = logging.getLogger('mailman.vette')
class BuiltInChain:
"""Default built-in chain."""
implements(IChain)
name = 'built-in'
description = _('The built-in moderation chain.')
_link_descriptions = (
('approved', LinkAction.jump, 'accept'),
('emergency', LinkAction.jump, 'hold'),
('loop', LinkAction.jump, 'discard'),
# Do all of the following before deciding whether to hold the message
# for moderation.
('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'),
# Take a detour through the self header matching chain, which we'll
# create later.
('truth', LinkAction.detour, 'header-match'),
# Finally, the builtin chain selfs 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_name, action, chain_name in self._link_descriptions:
# Get the named rule.
rule = config.rules[rule_name]
# Get the chain, if one is defined.
if chain_name is None:
chain = None
else:
chain = config.chains[chain_name]
links.append(Link(rule, action, chain))
return iter(self._cached_links)
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