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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.
"""Determine whether this message should be held for approval.
This modules tests only for hold situations, such as messages that are too
large, messages that have potential administrivia, etc. Definitive approvals
or denials are handled by a different module.
If no determination can be made (i.e. none of the hold criteria matches), then
we do nothing. If the message must be held for approval, then the hold
database is updated and any administator notification messages are sent.
Finally an exception is raised to let the pipeline machinery know that further
message handling should stop.
"""
import os
import string
import time
try:
import cPickle
pickle = cPickle
except ImportError:
import pickle
import HandlerAPI
from Mailman import Message
from Mailman import mm_cfg
from Mailman import Utils
class ForbiddenPoster(HandlerAPI.MessageHeld):
"Sender is explicitly forbidden"
pass
class ModeratedPost(HandlerAPI.MessageHeld):
"Post to moderated list"
pass
class NonMemberPost(HandlerAPI.MessageHeld):
"Post by non-member to a members-only list"
pass
class NotExplicitlyAllowed(HandlerAPI.MessageHeld):
"Posting to a restricted list by sender requires approval"
pass
class TooManyRecipients(HandlerAPI.MessageHeld):
"Too many recipients to the message"
pass
class ImplicitDestination(HandlerAPI.MessageHeld):
"Message has implicit destination"
pass
class Administrivia(HandlerAPI.MessageHeld):
"Message may contain adbministrivia"
pass
class SuspiciousHeaders(HandlerAPI.MessageHeld):
"Message has a suspicious header"
pass
class MessageTooBig(HandlerAPI.MessageHeld):
"Message body is too big"
pass
def process(mlist, msg):
if getattr(msg, 'approved', 0):
return
# get the sender of the message
listname = mlist.internal_name()
adminaddr = listname + '-admin'
sender = None
if mm_cfg.USE_ENVELOPE_SENDER:
sender = msg.GetEnvelopeSender()
# Special case an ugly sendmail feature: If there exists an alias of the
# form "owner-foo: bar" and sendmail receives mail for address "foo",
# sendmail will change the envelope sender of the message to "bar" before
# delivering. This feature does not appear to be configurable. *Boggle*.
if not sender or sender[:len(listname)+6] == adminaddr:
sender = msg.GetSender()
#
# is the poster in the list of explicitly forbidden posters?
if len(mlist.forbidden_posters):
forbiddens = Utils.List2Dict(mlist.forbidden_posters)
addrs = Utils.FindMatchingAddresses(sender, forbiddens)
if addrs:
hold_for_approval(mlist, msg, ForbiddenPoster)
# no return
#
# is the list moderated? if so and the sender is not in the list of
# allowed posters then hold the message.
if mlist.moderated:
posters = Utils.List2Dict(mlist.posters)
addrs = Utils.FindMatchingAddresses(sender, posters)
if not addrs:
hold_for_approval(mlist, msg, ModeratedPost)
# no return
#
# postings only from list members? mlist.posters are allowed in addition
# to list members. If not set, then only the members in posters are
# allowed to post without approval.
if mlist.member_posting_only:
posters = Utils.List2Dict(map(string.lower, mlist.posters))
if not mlist.IsMember(sender) and \
not Utils.FindMatchingAddresses(sender, posters):
# the sender is neither a member of the list, nor in the list of
# explicitly approved posters
hold_for_approval(mlist, msg, NonMemberPost)
# no return
elif mlist.posters:
posters = Utils.List2Dict(map(string.lower, mlist.posters))
if not Utils.FindMatchingAddresses(sender, posters):
# the sender is not explicitly in the list of allowed posters
# (which is non-empty), so hold the message
hold_for_approval(mlist, msg, NotExplicitlyAllowed)
# no return
#
# are there too many recipients to the message?
if mlist.max_num_recipients > 0:
# figure out how many recipients there are
recips = []
toheader = msg.getheader('to')
if toheader:
recips = recips + map(string.strip, string.split(toheader, ','))
ccheader = msg.getheader('cc')
if ccheader:
recips = recips + map(string.strip, string.split(ccheader, ','))
if len(recips) > mlist.max_num_recipients:
hold_for_approval(mlist, msg, TooManyRecipients)
# no return
#
# implicit destination? Note that message originating from the Usenet
# side of the world should never be implicitly destined
if mlist.require_explicit_destination and \
not mlist.HasExplicitDest(msg) and \
not getattr(msg, 'fromusenet', 0):
# then
hold_for_approval(mlist, msg, ImplicitDestination)
# no return
#
# possible administrivia?
if mlist.administrivia and Utils.IsAdministrivia(msg):
hold_for_approval(mlist, msg, Administrivia)
# no return
#
# suspicious headers?
if mlist.bounce_matching_headers:
triggered = mlist.HasMatchingHeader(msg)
if triggered:
# TBD: Darn - can't include the matching line for the admin
# message because the info would also go to the sender
hold_for_approval(mlist, msg, SuspiciousHeaders)
# no return
#
# message too big?
if mlist.max_message_size > 0:
if len(msg.body)/1024.0 > mlist.max_message_size:
hold_for_approval(mlist, msg, MessageTooBig)
# no return
def hold_for_approval(mlist, msg, excclass):
# TBD: This should really be tied into the email confirmation system so
# that the message can be approved or denied via email as well as the
# Web. That's for later though, because it would mean a revamp of the
# MailCommandHandler too.
#
listname = mlist.real_name
reason = excclass.__doc__
sender = msg.GetSender()
adminaddr = mlist.GetAdminEmail()
mlist.HoldMessage(msg, reason)
# now we need to craft and send a message to the list admin so they can
# deal with the held message
d = {'listname' : listname,
'hostname' : mlist.host_name,
'reason' : reason,
'sender' : sender,
'subject' : msg.get('subject', '(no subject)'),
'admindb_url': mlist.GetAbsoluteScriptURL('admindb'),
}
if mlist.admin_immed_notify:
# get the text from the template
subject = '%s post from %s requires approval' % (listname, sender)
text = Utils.maketext('postauth.txt', d, raw=1)
# craft the admin notification message and deliver it
msg = Message.UserNotification(adminaddr, adminaddr, subject, text)
HandlerAPI.DeliverToUser(mlist, msg)
# We may want to send a notification to the original sender too
fromusenet = getattr(msg, 'fromusenet', 0)
if not fromusenet and not mlist.dont_respond_to_post_requests:
subject = 'Your message to %s awaits moderator approval' % listname
text = Utils.maketext('postheld.txt', d)
msg = Message.UserNotification(sender, adminaddr, subject, text)
HandlerAPI.DeliverToUser(mlist, msg)
# Log the held message
mlist.LogMsg('vette', '%s post from %s held: %s' %
(listname, sender, reason))
# raise the specific MessageHeld exception to exit out of the message
# delivery pipeline
raise excclass
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