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# Copyright (C) 2007-2008 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.
"""The administrivia rule."""
__all__ = ['Administrivia']
__metaclass__ = type
from email.iterators import typed_subpart_iterator
from zope.interface import implements
from mailman.configuration import config
from mailman.i18n import _
from mailman.interfaces import IRule
# The list of email commands we search for in the Subject header and payload.
# We probably should get this information from the actual implemented
# commands.
EMAIL_COMMANDS = {
# keyword: (minimum #args, maximum #args)
'confirm': (1, 1),
'help': (0, 0),
'info': (0, 0),
'lists': (0, 0),
'options': (0, 0),
'password': (2, 2),
'remove': (0, 0),
'set': (3, 3),
'subscribe': (0, 3),
'unsubscribe': (0, 1),
'who': (0, 2),
}
class Administrivia:
"""The administrivia rule."""
implements(IRule)
name = 'administrivia'
description = _('Catch mis-addressed email commands.')
record = True
def check(self, mlist, msg, msgdata):
"""See `IRule`."""
# The list must have the administrivia check enabled.
if not mlist.administrivia:
return False
# First check the Subject text.
lines_to_check = []
subject = msg.get('subject', '')
if subject <> '':
lines_to_check.append(subject)
# Search only the first text/plain subpart of the message. There's
# really no good way to find email commands in any other content type.
for part in typed_subpart_iterator(msg, 'text', 'plain'):
payload = part.get_payload(decode=True)
lines = payload.splitlines()
# Count lines without using enumerate() because blank lines in the
# payload don't count against the maximum examined.
lineno = 0
for line in lines:
line = line.strip()
if line == '':
continue
lineno += 1
if lineno > config.EMAIL_COMMANDS_MAX_LINES:
break
lines_to_check.append(line)
# Only look at the first text/plain part.
break
# For each line we're checking, split the line into words. Then see
# if it looks like a command with the min-to-max number of arguments.
for line in lines_to_check:
words = [word.lower() for word in line.split()]
if words[0] not in EMAIL_COMMANDS:
# This is not an administrivia command.
continue
minargs, maxargs = EMAIL_COMMANDS[words[0]]
if minargs <= len(words) - 1 <= maxargs:
return True
return False
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