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# Copyright (C) 1998 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
'''Mixin class for gatewaying mail to news, and news to mail.'''
# All these things should already be imported, so might as well do them here
# at the top level
import os
import string
import re
import time
import mm_cfg
# XXX: Bogus, but might as we do it `legally'
QuickEscape = 'QuickEscape'
class GatewayManager:
def InitVars(self):
# Configurable
self.nntp_host = ''
self.linked_newsgroup = ''
self.gateway_to_news = 0
self.gateway_to_mail = 0
def GetConfigInfo(self):
return [
'Mail-to-News and News-to-Mail gateway services.',
('nntp_host', mm_cfg.String, 50, 0,
'The Internet address of the machine your News server '
'is running on.',
'The News server is not part of Mailman proper. You have to '
'already have access to a NNTP server, and that NNTP server '
'has to recognize the machine this mailing list runs on as '
'a machine capable of reading and posting news.'),
('linked_newsgroup', mm_cfg.String, 50, 0,
'The name of the Usenet group to gateway to and/or from.'),
('gateway_to_news', mm_cfg.Toggle, ('No', 'Yes'), 0,
'Should posts to the mailing list be resent to the '
'newsgroup?'),
('gateway_to_mail', mm_cfg.Toggle, ('No', 'Yes'), 0,
'Should newsgroup posts not sent from the list be resent '
'to the list?')
]
# This function is called from cron/gate_news and assumes the following
# have been asserted:
# - that the list gates from news to mail
# - that list has an nntp_host and linked_newsgroup
# - that the connection has been opened
# - that this method is run in a child process
# - that the watermark is non-zero
def PollNewsGroup(self, conn, wm, first, last):
import nntplib
# NEWNEWS is not portable and has synchronization issues... Use a
# watermark system instead.
for num in range(max(wm+1, first), last+1):
try:
headers = conn.head(`num`)[3]
found_to = 0
for header in headers:
i = string.find(header, ':')
if i > 0 and string.lower(header[:i]) == 'to':
found_to = 1
if header[:i] <> 'X-BeenThere':
continue
if header[i:] == ': %s' % self.GetListEmail():
raise QuickEscape
body = conn.body(`num`)[3]
# Create the pipe to the Mail posting script. Note that it is
# not installed executable, so we'll tack on the path to
# Python we discovered when we configured Mailman. The extra
# argument to `post' informs the system that the message is
# originating from Usenet and so should not get posted back to
# Usenet. I think this is mostly redundent with the
# X-BeenThere header, but I'm a little afraid to muck with
# that.
cmd = '%s %s %s fromusenet' % (
mm_cfg.PYTHON,
os.path.join(mm_cfg.SCRIPTS_DIR, 'post'),
self._internal_name)
file = os.popen(cmd, 'w')
# Usenet originated messages will not have a Unix envelope
# (i.e. "From " header). This breaks Pipermail archiving, so
# we will synthesize one. Be sure to use the format searched
# for by mailbox.UnixMailbox._isrealfromline()
timehdr = time.asctime(time.localtime(time.time()))
envhdr = 'From ' + self.GetAdminEmail() + ' ' + timehdr
file.write(envhdr + '\n')
file.write(string.join(headers,'\n'))
# If there wasn't already a TO: header, add one.
if not found_to:
file.write("\nTo: %s" % self.GetListEmail())
file.write('\n\n')
file.write(string.join(body,'\n'))
file.write('\n')
file.close()
except nntplib.error_temp:
pass # Probably canceled, etc...
except QuickEscape:
pass # We gated this TO news, don't repost it!
def SendMailToNewsGroup(self, mail_msg):
import Message
error = []
if not self.linked_newsgroup:
error.append('no newsgroup')
if not self.nntp_host:
error.append('no NNTP host')
if error:
msg = 'NNTP gateway improperly configured: ' + \
string.join(error, ', ')
self.LogMsg('error', msg)
return
if hasattr(mail_msg, 'fromusenet') and mail_msg.fromusenet:
# This message originated on Usenet; don't re-post it.
return
# Fork in case the nntp connection hangs.
if not os.fork():
# child
import nntplib
# Now make the news message...
msg = Message.NewsMessage(mail_msg)
# Ok, munge headers, etc.
subj = msg.getheader('subject')
if subj:
subjpref = self.subject_prefix
if not re.match('(re:? *)?' + re.escape(subjpref), subj, re.I):
msg.SetHeader('Subject', '%s%s' % (subjpref, subj))
else:
msg.SetHeader('Subject', '%s(no subject)' % subjpref)
if self.reply_goes_to_list:
del msg['reply-to']
msg.headers.append('Reply-To: %s\n' % self.GetListEmail())
# if we already have a sender header, don't add another one; use
# the header that's already there.
if not msg.getheader('sender'):
msg.headers.append('Sender: %s\n' % self.GetAdminEmail())
msg.headers.append('Errors-To: %s\n' % self.GetAdminEmail())
msg.headers.append('X-BeenThere: %s\n' % self.GetListEmail())
ngheader = msg.getheader('newsgroups')
if ngheader is not None:
# see if the Newsgroups: header already contains our
# linked_newsgroup. If so, don't add it again. If not,
# append our linked_newsgroup to the end of the header list
ngroups = map(string.strip, string.split(ngheader, ','))
if self.linked_newsgroup not in ngroups:
ngroups.append(self.linked_newsgroup)
ngheader = string.join(ngroups, ',')
# subtitute our new header for the old one. XXX Message
# class should have a __setitem__()
del msg['newsgroups']
msg.headers.append('Newsgroups: %s\n' % ngroups)
else:
# Newsgroups: isn't in the message
msg.headers.append('Newsgroups: %s\n' % self.linked_newsgroup)
# Note: Need to be sure 2 messages aren't ever sent to the same
# list in the same process, since message ID's need to be unique.
# Could make the ID be mm.listname.postnum instead if that happens
if msg.getheader('Message-ID') is None:
msg.headers.append('Message-ID: <mm.%s.%s@%s>\n' %
(time.time(), os.getpid(), self.host_name))
if msg.getheader('Lines') is None:
msg.headers.append('Lines: %s\n' %
len(string.split(msg.body,"\n")))
del msg['received']
# TBD: Gross hack to ensure that we have only one
# content-transfer-encoding header. More than one barfs NNTP. I
# don't know why we sometimes have more than one such header, and
# it probably isn't correct to take the value of just the first
# one. What if there are conflicting headers???
#
# This relies on the new interface for getaddrlist() returning
# values for all present headers, and the fact that the legal
# values are usually not parseable as addresses. Yes this is
# another bogosity.
cteheaders = msg.getaddrlist('content-transfer-encoding')
if cteheaders:
ctetuple = cteheaders[0]
ctevalue = ctetuple[1]
del msg['content-transfer-encoding']
msg['content-transfer-encoding'] = ctevalue
# NNTP is strict about spaces after the colon in headers.
for n in range(len(msg.headers)):
line = msg.headers[n]
i = string.find(line,":")
if i <> -1 and line[i+1] <> ' ':
msg.headers[n] = line[:i+1] + ' ' + line[i+1:]
con = nntplib.NNTP(self.nntp_host)
con.post(msg)
con.quit()
os._exit(0)
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