Mailman/rules/max_recipients.py

   1 # Copyright (C) 2007 by the Free Software Foundation, Inc.
   2 #
   3 # This program is free software; you can redistribute it and/or
   4 # modify it under the terms of the GNU General Public License
   5 # as published by the Free Software Foundation; either version 2
   6 # of the License, or (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program; if not, write to the Free Software
  15 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  16 # USA.
  17
  18 """The maximum number of recipients rule."""
  19
  20 __all__ = ['MaximumRecipients']
  21 __metaclass__ = type
  22
  23
  24 from email.utils import getaddresses
  25 from zope.interface import implements
  26
  27 from Mailman.i18n import _
  28 from Mailman.interfaces import IRule
  29
  30
  31 \f
  32 class MaximumRecipients:
  33     """The maximum number of recipients rule."""
  34     implements(IRule)
  35
  36     name = 'max-recipients'
  37     description = _('Catch messages with too many explicit recipients.')
  38
  39     def check(self, mlist, msg, msgdata):
  40         """See `IRule`."""
  41         # Zero means any number of recipients are allowed.
  42         if mlist.max_num_recipients == 0:
  43             return False
  44         # Figure out how many recipients there are
  45         recipients = getaddresses(msg.get_all('to', []) +
  46                                   msg.get_all('cc', []))
  47         return len(recipients) >= mlist.max_num_recipients