# Copyright (C) 1998-2003 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. """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, UnicodeEncodeError): 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=1), 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