# Copyright (C) 2001-2008 by the Free Software Foundation, Inc.
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.

"""Get the normal delivery recipients from a Sendmail style :include: file."""

from __future__ import with_statement

__metaclass__ = type
__all__ = ['FileRecipients']


import os
import errno

from zope.interface import implements

from mailman import Errors
from mailman.i18n import _
from mailman.interfaces import IHandler



class FileRecipients:
    """Get the normal delivery recipients from an include file."""

    implements(IHandler)

    name = 'file-recipients'
    description = _('Get the normal delivery recipients from an include file.')

    def process(self, mlist, msg, msgdata):
        """See `IHandler`."""
        if 'recips' in msgdata:
            return
        filename = os.path.join(mlist.full_path, 'members.txt')
        try:
            with open(filename) as fp:
                addrs = set(line.strip() for line in fp)
        except IOError, e:
            if e.errno <> errno.ENOENT:
                raise
            msgdata['recips'] = set()
            return
        # If the sender is a member of the list, remove them from the file
        # recipients.
        sender = msg.get_sender()
        member = mlist.members.get_member(sender)
        if member is not None:
            addrs.discard(member.address.address)
        msgdata['recips'] = addrs