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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# alias_resolver.py
# Copyright (C) 2013 LEAP
#
# 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 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Classes for resolving postfix aliases.
Test this with postmap -v -q "foo" tcp:localhost:4242
TODO:
o Look into using twisted.protocols.postfix.policies classes for
controlling concurrent connections and throttling resource consumption.
o We should probably use twisted.mail.alias somehow.
"""
from twisted.protocols import postfix
from leap.mx.tcp_map import LEAPPostfixTCPMapServerFactory
from leap.mx.tcp_map import TCP_MAP_CODE_SUCCESS
from leap.mx.tcp_map import TCP_MAP_CODE_PERMANENT_FAILURE
class LEAPPostfixTCPMapAliasServer(postfix.PostfixTCPMapServer):
"""
A postfix tcp map alias resolver server.
"""
def _cbGot(self, user_data):
"""
Return a code and message depending on the result of the factory's
get().
:param user_data: The user's uuid and pgp public key.
:type user_data: list
"""
uuid, _ = user_data
if uuid is None:
self.sendCode(
TCP_MAP_CODE_PERMANENT_FAILURE,
postfix.quote("NOT FOUND SRY"))
else:
# properly encode uuid, otherwise twisted complains when replying
if isinstance(uuid, unicode):
uuid = uuid.encode("utf8")
self.sendCode(
TCP_MAP_CODE_SUCCESS,
postfix.quote(uuid))
class AliasResolverFactory(LEAPPostfixTCPMapServerFactory):
"""
A factory for postfix tcp map alias resolver servers.
"""
protocol = LEAPPostfixTCPMapAliasServer
@property
def _query_message(self):
return "Resolving alias for"
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