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# Copyright (C) 2007-2015 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/>.
"""The administrivia rule."""
__all__ = [
'Administrivia',
]
from email.iterators import typed_subpart_iterator
from mailman.config import config
from mailman.core.i18n import _
from mailman.interfaces.rules import IRule
from zope.interface import implementer
# 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),
}
@implementer(IRule)
class Administrivia:
"""The administrivia rule."""
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 = str(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()
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 len(line) == 0:
continue
lineno += 1
if lineno > int(config.mailman.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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