# 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/>.

"""Microsoft's `SMTPSVC' nears I kin tell."""

import re
from cStringIO import StringIO

scre = re.compile(r'transcript of session follows', re.IGNORECASE)



def process(msg):
    if msg.get_content_type() <> 'multipart/mixed':
        return None
    # Find the first subpart, which has no MIME type
    try:
        subpart = msg.get_payload(0)
    except IndexError:
        # The message *looked* like a multipart but wasn't
        return None
    data = subpart.get_payload()
    if isinstance(data, list):
        # The message is a multi-multipart, so not a matching bounce
        return None
    body = StringIO(data)
    state = 0
    addrs = []
    while 1:
        line = body.readline()
        if not line:
            break
        if state == 0:
            if scre.search(line):
                state = 1
        if state == 1:
            if '@' in line:
                addrs.append(line)
    return addrs
