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# Copyright (C) 2008-2015 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/>.
"""Built-in pipelines."""
__all__ = [
'BasePipeline',
'OwnerPipeline',
'PostingPipeline',
'VirginPipeline',
'initialize',
'process',
]
import logging
from mailman.app.bounces import bounce_message
from mailman.config import config
from mailman.core import errors
from mailman.core.i18n import _
from mailman.interfaces.handler import IHandler
from mailman.interfaces.pipeline import IPipeline
from mailman.utilities.modules import find_components
from zope.interface import implementer
from zope.interface.verify import verifyObject
dlog = logging.getLogger('mailman.debug')
vlog = logging.getLogger('mailman.vette')
def process(mlist, msg, msgdata, pipeline_name='built-in'):
"""Process the message through the given pipeline.
:param mlist: the IMailingList for this message.
:param msg: The Message object.
:param msgdata: The message metadata dictionary.
:param pipeline_name: The name of the pipeline to process through.
"""
message_id = msg.get('message-id', 'n/a')
pipeline = config.pipelines[pipeline_name]
for handler in pipeline:
dlog.debug('{0} pipeline {1} processing: {2}'.format(
message_id, pipeline_name, handler.name))
try:
handler.process(mlist, msg, msgdata)
except errors.DiscardMessage as error:
vlog.info(
'{0} discarded by "{1}" pipeline handler "{2}": {3}'.format(
message_id, pipeline_name, handler.name, error.message))
except errors.RejectMessage as error:
vlog.info(
'{0} rejected by "{1}" pipeline handler "{2}": {3}'.format(
message_id, pipeline_name, handler.name, error.message))
bounce_message(mlist, msg, error)
@implementer(IPipeline)
class BasePipeline:
"""Base pipeline implementation."""
_default_handlers = ()
def __init__(self):
self._handlers = []
for handler_name in self._default_handlers:
self._handlers.append(config.handlers[handler_name])
def __iter__(self):
"""See `IPipeline`."""
for handler in self._handlers:
yield handler
class OwnerPipeline(BasePipeline):
"""The built-in owner pipeline."""
name = 'default-owner-pipeline'
description = _('The built-in owner pipeline.')
_default_handlers = (
'owner-recipients',
'to-outgoing',
)
class PostingPipeline(BasePipeline):
"""The built-in posting pipeline."""
name = 'default-posting-pipeline'
description = _('The built-in posting pipeline.')
_default_handlers = (
'mime-delete',
'tagger',
'member-recipients',
'avoid-duplicates',
'cleanse',
'cleanse-dkim',
'cook-headers',
'subject-prefix',
'rfc-2369',
'to-archive',
'to-digest',
'to-usenet',
'after-delivery',
'acknowledge',
'decorate',
'to-outgoing',
)
class VirginPipeline(BasePipeline):
"""The processing pipeline for virgin messages.
Virgin messages are those that are crafted internally by Mailman.
"""
name = 'virgin'
description = _('The virgin queue pipeline.')
_default_handlers = (
'cook-headers',
'to-outgoing',
)
def initialize():
"""Initialize the pipelines."""
# Find all handlers in the registered plugins.
for handler_class in find_components('mailman.handlers', IHandler):
handler = handler_class()
verifyObject(IHandler, handler)
assert handler.name not in config.handlers, (
'Duplicate handler "{0}" found in {1}'.format(
handler.name, handler_class))
config.handlers[handler.name] = handler
# Set up some pipelines.
for pipeline_class in (OwnerPipeline, PostingPipeline, VirginPipeline):
pipeline = pipeline_class()
config.pipelines[pipeline.name] = pipeline
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