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#!/usr/bin/env python
# Format mbox as HTML/XML
# Copyright (C) 2021 Nguyễn Gia Phong
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from argparse import ArgumentParser
from email.header import decode_header
from email.utils import parsedate_to_datetime
from functools import partial
from mailbox import mbox
from pathlib import Path
from urllib.parse import quote, unquote, urlencode
from bleach import clean, linkify
from markdown import markdown
sanitise = partial(clean, tags=('a', 'code', 'em', 'strong', 'sub', 'sup',
'blockquote', 'p', 'pre', 'ul', 'ol', 'li'),
protocols=('ftp', 'gemini', 'gopher', 'http', 'https',
'irc', 'ircs', 'mailto', 'matrix', 'xmpp'))
def extract(archive, parent):
"""Recursively extract emails in reply to given message ID."""
for message_id, message in archive.copy().items():
# TODO: handle multipart
if message['In-Reply-To'] != parent: continue
archive.pop(message_id)
yield message, extract(archive, message_id)
def decode(header):
"""Return the decoded email header."""
for string, charset in decode_header(header):
encoding = 'utf-8' if charset is None else charset
yield string.decode(encoding)
def reply_to(message):
"""Return mailto parameters for replying to the given email."""
yield 'In-Reply-To', message['Message-ID']
yield 'Cc', message.get('Reply-To', message['From'])
subject = message['Subject']
if subject is None: return
if subject.lower().startswith('re:'):
yield 'Subject', subject
else:
yield 'Subject', f'Re: {subject}'
def date(message):
"""Parse given email's Date header."""
return parsedate_to_datetime(message['Date']).date()
def render(template, forest, parent):
"""Render the thread recursively based on given template."""
for self, children in forest:
message_id = self['Message-Id']
try:
author, address = decode(self['From'])
except ValueError:
author = self['From']
body = sanitise(linkify(markdown(self.get_payload(),
output_format='html5')))
rendered_children = render(template, children, message_id)
yield template.format(message_id=quote(message_id),
mailto_params=urlencode(dict(reply_to(self))),
date=date(self).isoformat(), author=author,
body=body, children='\n'.join(rendered_children))
def main():
"""Parse command-line arguments and pass them to routines."""
parser = ArgumentParser(description='format mbox as HTML/XML')
parser.add_argument('mbox', help='path to mbox file')
parser.add_argument('id', type=unquote, help='root message ID')
parser.add_argument('template', type=Path, help='path to template')
args = parser.parse_args()
archive = {m['Message-Id']: m for m in sorted(mbox(args.mbox), key=date)}
template = args.template.read_text()
print(*render(template, extract(archive, args.id), args.id),
sep='', end='')
if __name__ == '__main__': main()
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