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# Copyright (C) 1998-2006 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.
"""Decorate a message by sticking the header and footer around it."""
from types import ListType
from email.MIMEText import MIMEText
from Mailman import mm_cfg
from Mailman import Utils
from Mailman import Errors
from Mailman.Message import Message
from Mailman.i18n import _
from Mailman.SafeDict import SafeDict
from Mailman.Logging.Syslog import syslog
try:
True, False
except:
True = 1
False = 0
def process(mlist, msg, msgdata):
# Digests and Mailman-craft messages should not get additional headers
if msgdata.get('isdigest') or msgdata.get('nodecorate'):
return
d = {}
if msgdata.get('personalize'):
# Calculate the extra personalization dictionary. Note that the
# length of the recips list better be exactly 1.
recips = msgdata.get('recips')
assert type(recips) == ListType and len(recips) == 1
member = recips[0].lower()
d['user_address'] = member
try:
d['user_delivered_to'] = mlist.getMemberCPAddress(member)
# BAW: Hmm, should we allow this?
d['user_password'] = mlist.getMemberPassword(member)
d['user_language'] = mlist.getMemberLanguage(member)
username = mlist.getMemberName(member) or None
try:
username = username.encode(Utils.GetCharSet(d['user_language']))
except (AttributeError, UnicodeError):
username = member
d['user_name'] = username
d['user_optionsurl'] = mlist.GetOptionsURL(member)
except Errors.NotAMemberError:
pass
# These strings are descriptive for the log file and shouldn't be i18n'd
header = decorate(mlist, mlist.msg_header, 'non-digest header', d)
footer = decorate(mlist, mlist.msg_footer, 'non-digest footer', d)
# Escape hatch if both the footer and header are empty
if not header and not footer:
return
# Be MIME smart here. We only attach the header and footer by
# concatenation when the message is a non-multipart of type text/plain.
# Otherwise, if it is not a multipart, we make it a multipart, and then we
# add the header and footer as text/plain parts.
#
# BJG: In addition, only add the footer if the message's character set
# matches the charset of the list's preferred language. This is a
# suboptimal solution, and should be solved by allowing a list to have
# multiple headers/footers, for each language the list supports.
#
# Also, if the list's preferred charset is us-ascii, we can always
# safely add the header/footer to a plain text message since all
# charsets Mailman supports are strict supersets of us-ascii --
# no, UTF-16 emails are not supported yet.
#
# TK: Message with 'charset=' cause trouble. So, instead of
# mgs.get_content_charset('us-ascii') ...
mcset = msg.get_content_charset() or 'us-ascii'
lcset = Utils.GetCharSet(mlist.preferred_language)
msgtype = msg.get_content_type()
# BAW: If the charsets don't match, should we add the header and footer by
# MIME multipart chroming the message?
wrap = True
if not msg.is_multipart() and msgtype == 'text/plain':
# TK: Try to keep the message plain by converting the header/
# footer/oldpayload into unicode and encode with mcset/lcset.
# Try to decode qp/base64 also.
uheader = unicode(header, lcset)
ufooter = unicode(footer, lcset)
try:
oldpayload = unicode(msg.get_payload(decode=True), mcset)
frontsep = endsep = u''
if header and not header.endswith('\n'):
frontsep = u'\n'
if footer and not oldpayload.endswith('\n'):
endsep = u'\n'
payload = uheader + frontsep + oldpayload + endsep + ufooter
try:
# first, try encode with list charset
payload = payload.encode(lcset)
newcset = lcset
except UnicodeError:
if lcset != mcset:
# if fail, encode with message charset (if different)
payload = payload.encode(mcset)
newcset = mcset
# if this fails, fallback to outer try and wrap=true
del msg['content-transfer-encoding']
del msg['content-type']
msg.set_payload(payload, newcset)
wrap = False
except (LookupError, UnicodeError):
pass
elif msg.get_type() == 'multipart/mixed':
# The next easiest thing to do is just prepend the header and append
# the footer as additional subparts
payload = msg.get_payload()
if not isinstance(payload, ListType):
payload = [payload]
if footer:
mimeftr = MIMEText(footer, 'plain', lcset)
mimeftr['Content-Disposition'] = 'inline'
payload.append(mimeftr)
if header:
mimehdr = MIMEText(header, 'plain', lcset)
mimehdr['Content-Disposition'] = 'inline'
payload.insert(0, mimehdr)
msg.set_payload(payload)
wrap = False
# If we couldn't add the header or footer in a less intrusive way, we can
# at least do it by MIME encapsulation. We want to keep as much of the
# outer chrome as possible.
if not wrap:
return
# Because of the way Message objects are passed around to process(), we
# need to play tricks with the outer message -- i.e. the outer one must
# remain the same instance. So we're going to create a clone of the outer
# message, with all the header chrome intact, then copy the payload to it.
# This will give us a clone of the original message, and it will form the
# basis of the interior, wrapped Message.
inner = Message()
# Which headers to copy? Let's just do the Content-* headers
for h, v in msg.items():
if h.lower().startswith('content-'):
inner[h] = v
inner.set_payload(msg.get_payload())
# For completeness
inner.set_unixfrom(msg.get_unixfrom())
inner.preamble = msg.preamble
inner.epilogue = msg.epilogue
# Don't copy get_charset, as this might be None, even if
# get_content_charset isn't. However, do make sure there is a default
# content-type, even if the original message was not MIME.
inner.set_default_type(msg.get_default_type())
# BAW: HACK ALERT.
if hasattr(msg, '__version__'):
inner.__version__ = msg.__version__
# Now, play games with the outer message to make it contain three
# subparts: the header (if any), the wrapped message, and the footer (if
# any).
payload = [inner]
if header:
mimehdr = MIMEText(header, 'plain', lcset)
mimehdr['Content-Disposition'] = 'inline'
payload.insert(0, mimehdr)
if footer:
mimeftr = MIMEText(footer, 'plain', lcset)
mimeftr['Content-Disposition'] = 'inline'
payload.append(mimeftr)
msg.set_payload(payload)
del msg['content-type']
del msg['content-transfer-encoding']
del msg['content-disposition']
msg['Content-Type'] = 'multipart/mixed'
def decorate(mlist, template, what, extradict={}):
# `what' is just a descriptive phrase used in the log message
#
# BAW: We've found too many situations where Python can be fooled into
# interpolating too much revealing data into a format string. For
# example, a footer of "% silly %(real_name)s" would give a header
# containing all list attributes. While we've previously removed such
# really bad ones like `password' and `passwords', it's much better to
# provide a whitelist of known good attributes, then to try to remove a
# blacklist of known bad ones.
d = SafeDict({'real_name' : mlist.real_name,
'list_name' : mlist.internal_name(),
# For backwards compatibility
'_internal_name': mlist.internal_name(),
'host_name' : mlist.host_name,
'web_page_url' : mlist.web_page_url,
'description' : mlist.description,
'info' : mlist.info,
'cgiext' : mm_cfg.CGIEXT,
})
d.update(extradict)
# Using $-strings?
if getattr(mlist, 'use_dollar_strings', 0):
template = Utils.to_percent(template)
# Interpolate into the template
try:
text = (template % d).replace('\r\n', '\n')
except (ValueError, TypeError), e:
syslog('error', 'Exception while calculating %s:\n%s', what, e)
what = what.upper()
text = template
return text
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