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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.
TODO:
o Look into using twisted.protocols.postfix.policies classes for
controlling concurrent connections and throttling resource consumption.
"""
import logging
try:
# TODO: we should probably use the system alias somehow
# from twisted.mail import alias
from twisted.protocols import postfix
except ImportError:
print "This software requires Twisted. Please see the README file"
print "for instructions on getting required dependencies."
logger = logging.getLogger(__name__)
class AliasResolverFactory(postfix.PostfixTCPMapDeferringDictServerFactory):
def __init__(self, couchdb, *args, **kwargs):
postfix.PostfixTCPMapDeferringDictServerFactory.__init__(self, *args, **kwargs)
self._cdb = couchdb
def _to_str(self, result):
if isinstance(result, unicode):
result = result.encode("utf8")
if result is None:
logger.debug("Result not found")
return result
def get(self, key):
orig_key = key
try:
logger.debug("Processing key: %s" % (key,))
if key.find("@") == -1:
logger.debug("Ignoring key since it's not an email address")
return None
key = key.split("@")[0]
key = key.split("+")[0]
logger.debug("Final key to query: %s" % (key,))
except Exception as e:
key = orig_key
logger.exception("%s" % (e,))
d = self._cdb.queryByLoginOrAlias(key)
d.addCallback(self._to_str)
return d
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