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# Copyright (C) 2000-2016 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.
"""NNTP queue runner."""
import re
import socket
import nntplib
from cStringIO import StringIO
import email
from email.Utils import getaddresses
COMMASPACE = ', '
from Mailman import mm_cfg
from Mailman import Utils
from Mailman.Queue.Runner import Runner
from Mailman.Logging.Syslog import syslog
# Matches our Mailman crafted Message-IDs. See Utils.unique_message_id()
mcre = re.compile(r"""
<mailman. # match the prefix
\d+. # serial number
\d+. # time in seconds since epoch
\d+. # pid
(?P<listname>[^@]+) # list's internal_name()
@ # localpart@dom.ain
(?P<hostname>[^>]+) # list's host_name
> # trailer
""", re.VERBOSE)
try:
True, False
except NameError:
True = 1
False = 0
class NewsRunner(Runner):
QDIR = mm_cfg.NEWSQUEUE_DIR
def _dispose(self, mlist, msg, msgdata):
# Make sure we have the most up-to-date state
mlist.Load()
if not msgdata.get('prepped'):
prepare_message(mlist, msg, msgdata)
try:
# Flatten the message object, sticking it in a StringIO object
fp = StringIO(msg.as_string())
conn = None
try:
try:
nntp_host, nntp_port = Utils.nntpsplit(mlist.nntp_host)
conn = nntplib.NNTP(nntp_host, nntp_port,
readermode=True,
user=mm_cfg.NNTP_USERNAME,
password=mm_cfg.NNTP_PASSWORD)
conn.post(fp)
except nntplib.error_temp, e:
syslog('error',
'(NNTPDirect) NNTP error for list "%s": %s',
mlist.internal_name(), e)
except socket.error, e:
syslog('error',
'(NNTPDirect) socket error for list "%s": %s',
mlist.internal_name(), e)
finally:
if conn:
conn.quit()
except Exception, e:
# Some other exception occurred, which we definitely did not
# expect, so set this message up for requeuing.
self._log(e)
return True
return False
def prepare_message(mlist, msg, msgdata):
# If the newsgroup is moderated, we need to add this header for the Usenet
# software to accept the posting, and not forward it on to the n.g.'s
# moderation address. The posting would not have gotten here if it hadn't
# already been approved. 1 == open list, mod n.g., 2 == moderated
if mlist.news_moderation in (1, 2):
del msg['approved']
msg['Approved'] = mlist.GetListEmail()
# Should we restore the original, non-prefixed subject for gatewayed
# messages? TK: We use stripped_subject (prefix stripped) which was
# crafted in CookHeaders.py to ensure prefix was stripped from the subject
# came from mailing list user.
stripped_subject = msgdata.get('stripped_subject') \
or msgdata.get('origsubj')
if not mlist.news_prefix_subject_too and stripped_subject is not None:
del msg['subject']
msg['Subject'] = stripped_subject
# Make sure we have a non-blank subject.
if not msg.get('subject', '').strip():
del msg['subject']
msg['Subject'] = '(no subject)'
# Add the appropriate Newsgroups: header
if msg['newsgroups'] is not None:
# This message is gated from our list to it's associated usnet group.
# If it has a Newsgroups: header mentioning other groups, it's not
# up to us to post it to those groups.
del msg['newsgroups']
msg['Newsgroups'] = mlist.linked_newsgroup
# Note: We need to be sure two messages aren't ever sent to the same list
# in the same process, since message ids need to be unique. Further, if
# messages are crossposted to two Usenet-gated mailing lists, they each
# need to have unique message ids or the nntpd will only accept one of
# them. The solution here is to substitute any existing message-id that
# isn't ours with one of ours, so we need to parse it to be sure we're not
# looping.
#
# We also add the original Message-ID: to References: to try to help with
# threading issues and create another header for documentation.
#
# Our Message-ID format is <mailman.secs.pid.listname@hostname>
msgid = msg['message-id']
hackmsgid = True
if msgid:
mo = mcre.search(msgid)
if mo:
lname, hname = mo.group('listname', 'hostname')
if lname == mlist.internal_name() and hname == mlist.host_name:
hackmsgid = False
if hackmsgid:
del msg['message-id']
msg['Message-ID'] = Utils.unique_message_id(mlist)
if msgid:
msg['X-Mailman-Original-Message-ID'] = msgid
refs = msg['references']
del msg['references']
if not refs:
refs = msg.get('in-reply-to', '')
else:
msg['X-Mailman-Original-References'] = refs
if refs:
msg['References'] = '\n '.join([refs, msgid])
else:
msg['References'] = msgid
# Lines: is useful
if msg['Lines'] is None:
# BAW: is there a better way?
count = len(list(email.Iterators.body_line_iterator(msg)))
msg['Lines'] = str(count)
# Massage the message headers by remove some and rewriting others. This
# woon't completely sanitize the message, but it will eliminate the bulk
# of the rejections based on message headers. The NNTP server may still
# reject the message because of other problems.
for header in mm_cfg.NNTP_REMOVE_HEADERS:
del msg[header]
for header, rewrite in mm_cfg.NNTP_REWRITE_DUPLICATE_HEADERS:
values = msg.get_all(header, [])
if len(values) < 2:
# We only care about duplicates
continue
del msg[header]
# But keep the first one...
msg[header] = values[0]
for v in values[1:]:
msg[rewrite] = v
# Mark this message as prepared in case it has to be requeued
msgdata['prepped'] = True
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