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# Copyright (C) 2009-2014 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/>.
"""VERP delivery."""
from __future__ import absolute_import, unicode_literals
__metaclass__ = type
__all__ = [
'VERPDelivery',
'VERPMixin',
]
import logging
from mailman.config import config
from mailman.mta.base import IndividualDelivery
from mailman.utilities.email import split_email
from mailman.utilities.string import expand
DOT = '.'
log = logging.getLogger('mailman.smtp')
class VERPMixin:
"""Mixin for VERP functionality.
This works by overriding the base class's _get_sender() method to return
the VERP'd envelope sender. It expects the individual recipient's address
to be squirreled away in the message metadata.
"""
def _get_sender(self, mlist, msg, msgdata):
"""Return the recipient's address VERP encoded in the sender.
:param mlist: The mailing list being delivered to.
:type mlist: `IMailingList`
:param msg: The original message being delivered.
:type msg: `Message`
:param msgdata: Additional message metadata for this delivery.
:type msgdata: dictionary
"""
sender = super(VERPMixin, self)._get_sender(mlist, msg, msgdata)
if msgdata.get('verp', False):
log.debug('VERPing %s', msg.get('message-id'))
recipient = msgdata['recipient']
sender_mailbox, sender_domain = split_email(sender)
# Encode the recipient's address for VERP.
recipient_mailbox, recipient_domain = split_email(recipient)
if recipient_domain is None:
# The recipient address is not fully-qualified. We can't
# deliver it to this person, nor can we craft a valid verp
# header. I don't think there's much we can do except ignore
# this recipient.
log.info('Skipping VERP delivery to unqual recip: %s',
recipient)
return sender
return '{0}@{1}'.format(
expand(config.mta.verp_format, dict(
bounces=sender_mailbox,
local=recipient_mailbox,
domain=DOT.join(recipient_domain))),
DOT.join(sender_domain))
else:
return sender
def avoid_duplicates(self, mlist, msg, msgdata):
"""Flag the message for duplicate avoidance.
We can flag the mail as a duplicate for each member, if they've
already received this message, as calculated by Message-ID. See
`AvoidDuplicates.py`_ for details.
"""
recipient = msgdata['recipient']
del msg['x-mailman-copy']
if recipient in msgdata.get('add-dup-header', {}):
msg['X-Mailman-Copy'] = 'yes'
class VERPDelivery(VERPMixin, IndividualDelivery):
"""Deliver a unique message to the MSA for each recipient."""
def __init__(self):
"""See `IndividualDelivery`."""
super(VERPDelivery, self).__init__()
self.callbacks.append(self.avoid_duplicates)
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