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# Copyright (C) 2000-2011 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/>.
"""Yale's mail server is pretty dumb.
Its reports include the end user's name, but not the full domain. I think we
can usually guess it right anyway. This is completely based on examination of
the corpse, and is subject to failure whenever Yale even slightly changes
their MTA. :(
"""
from __future__ import absolute_import, unicode_literals
__metaclass__ = type
__all__ = [
'Yale',
]
import re
from cStringIO import StringIO
from email.utils import getaddresses
from flufl.enum import Enum
from zope.interface import implements
from mailman.interfaces.bounce import IBounceDetector
scre = re.compile(r'Message not delivered to the following', re.IGNORECASE)
ecre = re.compile(r'Error Detail', re.IGNORECASE)
acre = re.compile(r'\s+(?P<addr>\S+)\s+')
class ParseState(Enum):
start = 0
intro_found = 1
class Yale:
"""Parse Yale's bounces (or what used to be)."""
implements(IBounceDetector)
def process(self, msg):
"""See `IBounceDetector`."""
if msg.is_multipart():
return None
try:
whofrom = getaddresses([msg.get('from', '')])[0][1]
if not whofrom:
return None
username, domain = whofrom.split('@', 1)
except (IndexError, ValueError):
return None
if username.lower() != 'mailer-daemon':
return None
parts = domain.split('.')
parts.reverse()
for part1, part2 in zip(parts, ('edu', 'yale')):
if part1 != part2:
return None
# Okay, we've established that the bounce came from the mailer-daemon
# at yale.edu. Let's look for a name, and then guess the relevant
# domains.
names = set()
body = StringIO(msg.get_payload())
state = ParseState.start
for line in body:
if state is ParseState.start and scre.search(line):
state = ParseState.intro_found
elif state is ParseState.intro_found and ecre.search(line):
break
elif state is ParseState.intro_found:
mo = acre.search(line)
if mo:
names.add(mo.group('addr'))
# Now we have a bunch of names, these are either @yale.edu or
# @cs.yale.edu. Add them both.
addresses = []
for name in names:
addresses.append(name + '@yale.edu')
addresses.append(name + '@cs.yale.edu')
return addresses
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