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# Copyright (C) 1998-2010 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/>.
"""Yahoo! has its own weird format for bounces."""
from __future__ import absolute_import, unicode_literals
__metaclass__ = type
__all__ = [
'Yahoo',
]
import re
import email
from email.utils import parseaddr
from flufl.enum import Enum
from zope.interface import implements
from mailman.interfaces.bounce import IBounceDetector
tcre = re.compile(r'message\s+from\s+yahoo\.\S+', re.IGNORECASE)
acre = re.compile(r'<(?P<addr>[^>]*)>:')
ecre = re.compile(r'--- Original message follows')
class ParseState(Enum):
start = 0
tag_seen = 1
class Yahoo:
"""Yahoo! bounce detection."""
implements(IBounceDetector)
def process(self, msg):
"""See `IBounceDetector`."""
# Yahoo! bounces seem to have a known subject value and something
# called an x-uidl: header, the value of which seems unimportant.
sender = parseaddr(msg.get('from', '').lower())[1] or ''
if not sender.startswith('mailer-daemon@yahoo'):
return None
addresses = set()
state = ParseState.start
for line in email.Iterators.body_line_iterator(msg):
line = line.strip()
if state is ParseState.start and tcre.match(line):
state = ParseState.tag_seen
elif state is ParseState.tag_seen:
mo = acre.match(line)
if mo:
addresses.add(mo.group('addr'))
continue
mo = ecre.match(line)
if mo:
# We're at the end of the error response.
break
return list(addresses)
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