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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.
"""
try:
# TODO: we should probably use the system alias somehow
# from twisted.mail import alias
from twisted.protocols import postfix
from twisted.python import log
from twisted.internet import defer
except ImportError:
print "This software requires Twisted. Please see the README file"
print "for instructions on getting required dependencies."
class LEAPPostFixTCPMapserver(postfix.PostfixTCPMapServer):
def _cbGot(self, value):
if value is None:
self.sendCode(500, postfix.quote("NOT FOUND SRY"))
else:
self.sendCode(200, postfix.quote(value))
class AliasResolverFactory(postfix.PostfixTCPMapDeferringDictServerFactory):
protocol = LEAPPostFixTCPMapserver
def __init__(self, couchdb, *args, **kwargs):
postfix.PostfixTCPMapDeferringDictServerFactory.__init__(
self, *args, **kwargs)
self._cdb = couchdb
def _to_str(self, result):
"""
Properly encodes the result string if any.
"""
if isinstance(result, unicode):
result = result.encode("utf8")
if result is None:
log.msg("Result not found")
return result
def spit_result(self, result):
"""
Formats the return codes in a postfix friendly format.
"""
if result is None:
return None
else:
return defer.succeed(result)
def get(self, key):
"""
Looks up the passed key, but only up to the username id of the key.
At some point we will have to consider the domain part too.
"""
try:
log.msg("Query key: %s" % (key,))
d = self._cdb.queryByAddress(key)
d.addCallback(self._to_str)
d.addCallback(self.spit_result)
d.addErrback(log.err)
return d
except Exception as e:
log.err('exception in get: %r' % e)
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