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# Copyright (C) 2007 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.
"""Various rule helpers"""
__all__ = [
'TruthRule',
'initialize',
]
__metaclass__ = type
from zope.interface import implements
from zope.interface.verify import verifyObject
from Mailman.app.plugins import get_plugins
from Mailman.configuration import config
from Mailman.interfaces import IRule
class TruthRule:
"""A rule that always matches."""
implements(IRule)
name = 'truth'
description = 'A rule which always matches.'
record = False
def check(self, mlist, msg, msgdata):
"""See `IRule`."""
return True
def initialize():
"""Find and register all rules in all plugins."""
# Register built in rules.
config.rules[TruthRule.name] = TruthRule()
# Find rules in plugins.
for rule_finder in get_plugins('mailman.rules'):
for rule_class in rule_finder():
rule = rule_class()
verifyObject(IRule, rule)
assert rule.name not in config.rules, (
'Duplicate rule "%s" found in %s' % (rule.name, rule_finder))
config.rules[rule.name] = rule
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