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# Format mailbox as HTML/XML
# Copyright (C) 2021-2024 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 collections import defaultdict
from email.header import decode_header
from email.utils import parsedate_to_datetime
from functools import partial
from mailbox import Maildir, mbox
from pathlib import Path
from urllib.parse import quote, unquote, urlencode
from mistune import create_markdown
from nh3 import clean
markdown = create_markdown(plugins=['url'])
sanitise = partial(clean, tags={'a', 'code', 'em', 'strong', 'sub', 'sup',
'blockquote', 'p', 'pre', 'ul', 'ol', 'li'},
url_schemes={'ftp', 'gemini', 'gopher', 'http', 'https',
'irc', 'ircs', 'mailto', 'matrix', 'xmpp'})
def mailbox(path):
"""Parse and return the mailbox at given path.
Supported formats are Maildir and mbox.
"""
try:
return mbox(path, create=False)
except IsADirectoryError:
return Maildir(path, create=False)
def get_body(message):
"""Return the Markdown message body converted to HTML."""
if message.is_multipart():
for payload in map(get_body, message.get_payload()):
if payload is not None: return payload
elif message.get_content_type() in ('text/markdown', 'text/plain'):
payload = message.get_payload(decode=True).decode()
return sanitise(markdown(payload))
return None
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, archive, parent):
"""Render the thread recursively based on given template."""
for self in sorted(archive[parent], key=date):
body = get_body(self)
if body is None: continue
message_id = self['Message-Id']
# Please don't have space in email addresses
author = ''.join(decode(self['From'])).rsplit(maxsplit=1)[0]
rendered_children = render(template, archive, message_id)
yield template.format(in_reply_to=quote(parent),
message_id=quote(message_id), author=author,
mailto_params=urlencode(dict(reply_to(self))),
date=date(self).isoformat(), rfc822=self['Date'],
body=body, children='\n'.join(rendered_children))
def main():
"""Parse command-line arguments and pass them to routines."""
parser = ArgumentParser(description='format mailbox as HTML/XML')
parser.add_argument('mailbox', type=mailbox,
help='path to mbox file or maildir')
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 = defaultdict(list)
for message in args.mailbox:
archive[message['In-Reply-To']].append(message)
template = args.template.read_text()
print(*render(template, archive, args.id), sep='', end='')
if __name__ == '__main__': main()
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