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# Copyright (C) 2008-2011 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman 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 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman 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
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Prototypical permalinking archiver."""
from __future__ import absolute_import, unicode_literals
__metaclass__ = type
__all__ = [
'Prototype',
]
import hashlib
from base64 import b32encode
from urlparse import urljoin
from zope.interface import implements
from mailman.interfaces.archiver import IArchiver
class Prototype:
"""A prototype of a third party archiver.
Mailman proposes a draft specification for interoperability between list
servers and archivers: <http://wiki.list.org/display/DEV/Stable+URLs>.
"""
implements(IArchiver)
name = 'prototype'
@staticmethod
def list_url(mlist):
"""See `IArchiver`."""
return mlist.domain.base_url
@staticmethod
def permalink(mlist, msg):
"""See `IArchiver`."""
message_id = msg.get('message-id')
# It is not the archiver's job to ensure the message has a Message-ID.
# If this header is missing, there is no permalink.
if message_id is None:
return None
# The angle brackets are not part of the Message-ID. See RFC 2822.
if message_id.startswith('<') and message_id.endswith('>'):
message_id = message_id[1:-1]
else:
message_id = message_id.strip()
digest = hashlib.sha1(message_id).digest()
message_id_hash = b32encode(digest)
del msg['x-message-id-hash']
msg['X-Message-ID-Hash'] = message_id_hash
return urljoin(Prototype.list_url(mlist), message_id_hash)
@staticmethod
def archive_message(mlist, message):
"""See `IArchiver`."""
raise NotImplementedError
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