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# Copyright (C) 1998-2009 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/>.
"""Extend mailbox.UnixMailbox.
"""
import sys
import email
import mailbox
from email.Errors import MessageParseError
from email.Generator import Generator
from mailman.Message import Message
def _safeparser(fp):
try:
return email.message_from_file(fp, Message)
except MessageParseError:
# Don't return None since that will stop a mailbox iterator
return ''
class Mailbox(mailbox.PortableUnixMailbox):
def __init__(self, fp):
mailbox.PortableUnixMailbox.__init__(self, fp, _safeparser)
# msg should be an rfc822 message or a subclass.
def AppendMessage(self, msg):
# Check the last character of the file and write a newline if it isn't
# a newline (but not at the beginning of an empty file).
try:
self.fp.seek(-1, 2)
except IOError, e:
# Assume the file is empty. We can't portably test the error code
# returned, since it differs per platform.
pass
else:
if self.fp.read(1) <> '\n':
self.fp.write('\n')
# Seek to the last char of the mailbox
self.fp.seek(1, 2)
# Create a Generator instance to write the message to the file
g = Generator(self.fp)
g.flatten(msg, unixfrom=True)
# Add one more trailing newline for separation with the next message
# to be appended to the mbox.
print >> self.fp
# This stuff is used by pipermail.py:processUnixMailbox(). It provides an
# opportunity for the built-in archiver to scrub archived messages of nasty
# things like attachments and such...
def _archfactory(mailbox):
# The factory gets a file object, but it also needs to have a MailList
# object, so the clearest <wink> way to do this is to build a factory
# function that has a reference to the mailbox object, which in turn holds
# a reference to the mailing list. Nested scopes would help here, BTW,
# but we can't rely on them being around (e.g. Python 2.0).
def scrubber(fp, mailbox=mailbox):
msg = _safeparser(fp)
if msg == '':
return msg
return mailbox.scrub(msg)
return scrubber
class ArchiverMailbox(Mailbox):
# This is a derived class which is instantiated with a reference to the
# MailList object. It is build such that the factory calls back into its
# scrub() method, giving the scrubber module a chance to do its thing
# before the message is archived.
def __init__(self, fp, mlist):
scrubber_module = config.scrubber.archive_scrubber
if scrubber_module:
__import__(scrubber_module)
self._scrubber = sys.modules[scrubber_module].process
else:
self._scrubber = None
self._mlist = mlist
mailbox.PortableUnixMailbox.__init__(self, fp, _archfactory(self))
def scrub(self, msg):
if self._scrubber:
return self._scrubber(self._mlist, msg)
else:
return msg
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