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# 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/>.
"""-request robot command queue runner."""
__metaclass__ = type
__all__ = [
'CommandRunner',
'Results',
]
# See the delivery diagram in IncomingRunner.py. This module handles all
# email destined for mylist-request, -join, and -leave. It no longer handles
# bounce messages (i.e. -admin or -bounces), nor does it handle mail to
# -owner.
import re
import logging
from StringIO import StringIO
from email.Errors import HeaderParseError
from email.Header import decode_header, make_header
from email.Iterators import typed_subpart_iterator
from zope.interface import implements
from mailman.config import config
from mailman.core.i18n import _
from mailman.email.message import Message, UserNotification
from mailman.interfaces.command import ContinueProcessing, IEmailResults
from mailman.queue import Runner
NL = '\n'
log = logging.getLogger('mailman.vette')
class CommandFinder:
"""Generate commands from the content of a message."""
def __init__(self, msg, msgdata, results):
self.command_lines = []
self.ignored_lines = []
self.processed_lines = []
# Depending on where the message was destined to, add some implicit
# commands. For example, if this was sent to the -join or -leave
# addresses, it's the same as if 'join' or 'leave' commands were sent
# to the -request address.
subaddress = msgdata.get('subaddress')
if subaddress == 'join':
self.command_lines.append('join')
elif subaddress == 'leave':
self.command_lines.append('leave')
elif subaddress == 'confirm':
mo = re.match(config.mta.verp_confirm_regexp, msg.get('to', ''))
if mo:
self.command_lines.append('confirm ' + mo.group('cookie'))
# Extract the subject header and do RFC 2047 decoding.
raw_subject = msg.get('subject', '')
try:
subject = unicode(make_header(decode_header(raw_subject)))
# Mail commands must be ASCII.
self.command_lines.append(subject.encode('us-ascii'))
except (HeaderParseError, UnicodeError, LookupError):
# The Subject header was unparseable or not ASCII, so just ignore
# it.
pass
# Find the first text/plain part of the message.
part = None
for part in typed_subpart_iterator(msg, 'text', 'plain'):
break
if part is None or part is not msg:
# Either there was no text/plain part or we ignored some
# non-text/plain parts.
print >> results, _('Ignoring non-text/plain MIME parts')
if part is None:
# There was no text/plain part to be found.
return
body = part.get_payload(decode=True)
# text/plain parts better have string payloads.
assert isinstance(body, basestring), 'Non-string decoded payload'
lines = body.splitlines()
# Use no more lines than specified
max_lines = int(config.mailman.email_commands_max_lines)
self.command_lines.extend(lines[:max_lines])
self.ignored_lines.extend(lines[max_lines:])
def __iter__(self):
"""Return each command line, split into commands and arguments.
:return: 2-tuples where the first element is the command and the
second element is a tuple of the arguments.
"""
while self.command_lines:
line = self.command_lines.pop(0)
self.processed_lines.append(line)
parts = line.strip().split()
if len(parts) == 0:
continue
command = parts.pop(0)
yield command, tuple(parts)
class Results:
"""The email command results."""
implements(IEmailResults)
def __init__(self):
self._output = StringIO()
print >> self._output, _("""\
The results of your email command are provided below.
""")
def write(self, text):
self._output.write(text)
def __unicode__(self):
value = self._output.getvalue()
assert isinstance(value, unicode), 'Not a unicode: %r' % value
return value
class CommandRunner(Runner):
"""The email command runner."""
def _dispose(self, mlist, msg, msgdata):
message_id = msg.get('message-id', 'n/a')
# The policy here is similar to the Replybot policy. If a message has
# "Precedence: bulk|junk|list" and no "X-Ack: yes" header, we discard
# the command message.
precedence = msg.get('precedence', '').lower()
ack = msg.get('x-ack', '').lower()
if ack <> 'yes' and precedence in ('bulk', 'junk', 'list'):
log.info('%s Precedence: %s message discarded by: %s',
message_id, precedence, mlist.request_address)
return False
# Do replybot for commands.
replybot = config.handlers['replybot']
replybot.process(mlist, msg, msgdata)
if mlist.autorespond_requests == 1:
# Respond and discard.
log.info('%s -request message replied and discard', message_id)
return False
# Now craft the response and process the command lines.
results = Results()
# Include just a few key pieces of information from the original: the
# sender, date, and message id.
print >> results, _('- Original message details:')
subject = msg.get('subject', 'n/a')
date = msg.get('date', 'n/a')
from_ = msg.get('from', 'n/a')
print >> results, _(' From: $from_')
print >> results, _(' Subject: $subject')
print >> results, _(' Date: $date')
print >> results, _(' Message-ID: $message_id')
print >> results, _('\n- Results:')
finder = CommandFinder(msg, msgdata, results)
for command_name, arguments in finder:
command = config.commands.get(command_name)
if command is None:
print >> results, _('No such command: $command_name')
else:
status = command.process(
mlist, msg, msgdata, arguments, results)
assert status in ContinueProcessing, (
'Invalid status: %s' % status)
if status == ContinueProcessing.no:
break
# All done. Strip blank lines and send the response.
lines = filter(None, (line.strip() for line in finder.command_lines))
if len(lines) > 0:
print >> results, _('\n- Unprocessed:')
for line in lines:
print >> results, line
lines = filter(None, (line.strip() for line in finder.ignored_lines))
if len(lines) > 0:
print >> results, _('\n- Ignored:')
for line in lines:
print >> results, line
print >> results, _('\n- Done.')
# Send a reply, but do not attach the original message. This is a
# compromise because the original message is often helpful in tracking
# down problems, but it's also a vector for backscatter spam.
language = config.languages[msgdata['lang']]
reply = UserNotification(msg.sender, mlist.bounces_address,
_('The results of your email commands'),
lang=language)
# Find a charset for the response body. Try ascii first, then
# latin-1 and finally falling back to utf-8.
reply_body = unicode(results)
for charset in ('us-ascii', 'latin-1'):
try:
reply_body.encode(charset)
break
except UnicodeError:
pass
else:
charset = 'utf-8'
reply.set_payload(reply_body, charset=charset)
reply.send(mlist)
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