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# Copyright (C) 2002-2012 by the Free Software Foundation, Inc.
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# This file is part of GNU Mailman.
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# GNU Mailman is free software: you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free
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# Software Foundation, either version 3 of the License, or (at your option)
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# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# You should have received a copy of the GNU General Public License along with
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# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
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"""If the user wishes it, do not send duplicates of the same message.
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This module keeps an in-memory dictionary of Message-ID: and recipient pairs.
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If a message with an identical Message-ID: is about to be sent to someone who
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has already received a copy, we either drop the message, add a duplicate
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warning header, or pass it through, depending on the user's preferences.
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from __future__ import absolute_import, print_function, unicode_literals
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from email.utils import getaddresses, formataddr
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from zope.interface import implementer
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from mailman.core.i18n import _
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from mailman.interfaces.handler import IHandler
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@implementer(IHandler)
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class AvoidDuplicates:
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"""If the user wishes it, do not send duplicates of the same message."""
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name = 'avoid-duplicates'
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description = _('Suppress some duplicates of the same message.')
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def process(self, mlist, msg, msgdata):
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recips = msgdata.get('recipients')
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# Seed this set with addresses we don't care about dup avoiding.
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listaddrs = set((mlist.posting_address,
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mlist.bounces_address,
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mlist.request_address))
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explicit_recips = listaddrs.copy()
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# Figure out the set of explicit recipients.
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for header in ('to', 'cc', 'resent-to', 'resent-cc'):
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addrs = getaddresses(msg.get_all(header, []))
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header_addresses = dict((addr, formataddr((name, addr)))
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for name, addr in addrs
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# Yes, it's possible that an address is mentioned in multiple
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# CC headers using different names. In that case, the last
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# real name will win, but that doesn't seem like such a big
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# deal. Besides, how else would you chose?
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cc_addresses.update(header_addresses)
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# Ignore the list addresses for purposes of dup avoidance.
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explicit_recips |= set(header_addresses)
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# Now strip out the list addresses.
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explicit_recips -= listaddrs
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if not explicit_recips:
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# No one was explicitly addressed, so we can't do any dup
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# If this recipient is explicitly addressed...
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if r in explicit_recips:
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# If the member wants to receive duplicates, or if the
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# recipient is not a member at all, they will get a copy.
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member = mlist.members.get_member(r)
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if member and not member.receive_list_copy:
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send_duplicate = False
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# We'll send a duplicate unless the user doesn't wish it. If
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# personalization is enabled, the add-dupe-header flag will
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# add a X-Mailman-Duplicate: yes header for this user's
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msgdata.setdefault('add-dup-header', set()).add(r)
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elif r in cc_addresses:
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# Otherwise, this is the first time they've been in the recips
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# list. Add them to the newrecips list and flag them as
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# having received this message.
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# Set the new list of recipients. XXX recips should always be a set.
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msgdata['recipients'] = list(newrecips)
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# RFC 2822 specifies zero or one CC header
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msg['CC'] = COMMASPACE.join(cc_addresses.values())
added
removed
src/mailman/handlers/avoid_duplicates.py
