# -*- coding: utf-8 -*- # mail_services.py # Copyright (C) 2016-2017 LEAP Encryption Acess Project # # 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 . """ Mail services. This is quite moving work still. This should be moved to the different submodules when it stabilizes. """ import json import os import re import shutil import tempfile from collections import defaultdict from collections import namedtuple from twisted.application import service from twisted.internet import defer from twisted.logger import Logger from leap.common.events import catalog, emit_async from leap.common.files import check_and_fix_urw_only from leap.bitmask.bonafide import config from leap.bitmask.hooks import HookableService from leap.bitmask.util import get_gpg_bin_path, merge_status try: from leap.bitmask.keymanager import KeyManager from leap.bitmask.keymanager.errors import KeyNotFound from leap.bitmask.keymanager.validation import ValidationLevels from leap.bitmask.mail import errors from leap.bitmask.mail.constants import INBOX_NAME from leap.bitmask.mail.mail import Account from leap.bitmask.mail.imap import service as imap_service from leap.bitmask.mail.smtp import service as smtp_service from leap.bitmask.mail.incoming.service import IncomingMail from leap.bitmask.mail.incoming.service import INCOMING_CHECK_PERIOD from leap.bitmask.mail.utils import first from leap.bitmask.mail.outgoing.service import OutgoingMail from leap.bitmask.mail.outgoing.sender import SMTPSender from leap.bitmask.mail.smtp.bounces import bouncerFactory from leap.soledad.client.api import Soledad HAS_MAIL = True except ImportError: HAS_MAIL = False try: from leap.bitmask.mua import pixelizer HAS_MUA = True except ImportError: HAS_MUA = False from leap.bitmask.core.uuid_map import UserMap from leap.bitmask.core.configurable import DEFAULT_BASEDIR class Container(object): def __init__(self, service=None): self._instances = defaultdict(None) if service is not None: self.service = service def get_instance(self, key): return self._instances.get(key, None) def add_instance(self, key, data): self._instances[key] = data class ImproperlyConfigured(Exception): pass class SoledadContainer(Container): log = Logger() def __init__(self, service=None, basedir=DEFAULT_BASEDIR): self._basedir = os.path.expanduser(basedir) self._usermap = UserMap() super(SoledadContainer, self).__init__(service=service) def add_instance(self, userid, passphrase, uuid=None, token=None): if not uuid: bootstrapped_uuid = self._usermap.lookup_uuid(userid, passphrase) uuid = bootstrapped_uuid if not uuid: return else: self._usermap.add(userid, uuid, passphrase) user, provider = userid.split('@') soledad_path = os.path.join(self._basedir, 'soledad') soledad_url = _get_soledad_uri(self._basedir, provider) cert_path = _get_ca_cert_path(self._basedir, provider) soledad = self._create_soledad_instance( uuid, passphrase, soledad_path, soledad_url, cert_path, token) super(SoledadContainer, self).add_instance(userid, soledad) data = {'user': userid, 'uuid': uuid, 'token': token, 'soledad': soledad} self.service.trigger_hook('on_new_soledad_instance', **data) self.log.debug('Syncing soledad for the first time...') d = soledad.sync() d.addCallbacks( lambda _: self.service.trigger_hook('on_soledad_first_sync', **data), lambda _: self.log.failure('Something failed on soledad first sync')) def _create_soledad_instance(self, uuid, passphrase, soledad_path, server_url, cert_file, token): # setup soledad info secrets_path = os.path.join(soledad_path, '%s.secret' % uuid) local_db_path = os.path.join(soledad_path, '%s.db' % uuid) return Soledad( uuid, unicode(passphrase), secrets_path=secrets_path, local_db_path=local_db_path, server_url=server_url, cert_file=cert_file, auth_token=token) def set_remote_auth_token(self, userid, token): self.get_instance(userid).token = token def sync(self, userid): self.get_instance(userid).sync() def _get_provider_from_full_userid(userid): _, provider_id = config.get_username_and_provider(userid) # TODO -- this autoconf should be passed from the # command flag. workaround to get cli workinf for now. return config.Provider.get(provider_id, autoconf=True) def is_service_ready(service, provider): """ Returns True when the following conditions are met: - Provider offers that service. - We have the config files for the service. - The service is enabled. """ has_service = provider.offers_service(service) has_config = provider.has_config_for_service(service) is_enabled = provider.is_service_enabled(service) return has_service and has_config and is_enabled class SoledadService(HookableService): log = Logger() def __init__(self, basedir): service.Service.__init__(self) self._basedir = basedir def startService(self): self.log.info('Starting Soledad Service') self._container = SoledadContainer(service=self) super(SoledadService, self).startService() # hooks def hook_on_passphrase_entry(self, **kw): userid = kw.get('username') provider = _get_provider_from_full_userid(userid) provider.callWhenReady(self._hook_on_passphrase_entry, provider, **kw) def _hook_on_passphrase_entry(self, provider, **kw): if is_service_ready('mx', provider): userid = kw.get('username') password = kw.get('password') uuid = kw.get('uuid') container = self._container self.log.debug('On_passphrase_entry: ' 'New Soledad Instance: %s' % userid) if not container.get_instance(userid): container.add_instance(userid, password, uuid=uuid, token=None) else: self.log.debug('Service MX is not ready...') def hook_on_bonafide_auth(self, **kw): userid = kw['username'] provider = _get_provider_from_full_userid(userid) provider.callWhenReady(self._hook_on_bonafide_auth, provider, **kw) def _hook_on_bonafide_auth(self, provider, **kw): if provider.offers_service('mx'): userid = kw['username'] password = kw['password'] token = kw['token'] uuid = kw['uuid'] container = self._container if container.get_instance(userid): self.log.debug( 'Passing a new SRP Token to Soledad: %s' % userid) container.set_remote_auth_token(userid, token) else: self.log.debug( 'Adding a new Soledad Instance: %s' % userid) container.add_instance( userid, password, uuid=uuid, token=token) def hook_on_passphrase_change(self, **kw): # TODO: if bitmask stops before this hook being executed bonafide and # soledad will end up with different passwords # https://leap.se/code/issues/8489 userid = kw['username'] password = kw['password'] soledad = self._container.get_instance(userid) if soledad is not None: self.log.info('Change soledad passphrase for %s' % userid) soledad.change_passphrase(unicode(password)) class KeymanagerContainer(Container): log = Logger() def __init__(self, service=None, basedir=DEFAULT_BASEDIR): self._basedir = os.path.expanduser(basedir) self._status = {} super(KeymanagerContainer, self).__init__(service=service) def add_instance(self, userid, token, uuid, soledad): self.log.debug('Adding Keymanager instance for: %s' % userid) self._set_status(userid, "starting") keymanager = self._create_keymanager_instance( userid, token, uuid, soledad) super(KeymanagerContainer, self).add_instance(userid, keymanager) def set_remote_auth_token(self, userid, token): self.get_instance(userid).token = token def status(self, userid): if userid not in self._status: return {'status': 'off', 'error': None, 'keys': None} return self._status[userid] def get_or_generate_keys(self, userid): keymanager = self.get_instance(userid) def _found_key(key): self.log.info('Found key: %r' % key) self._set_status(userid, "on", keys="found") return key def key_generated_cb(passthru): self._set_status(userid, "on", keys="found") return passthru def _if_not_found_generate(failure): failure.trap(KeyNotFound) self.log.info('Key not found, generating key for %s' % (userid,)) self._set_status(userid, "starting", keys="generating") d = keymanager.gen_key() d.addCallback(key_generated_cb) d.addErrback(_log_key_error) return d def _log_key_error(failure): self.log.failure('Error while generating key!') error = "Error generating key: %s" % failure.getErrorMessage() self._set_status(userid, "failed", error=error) return failure self.log.info('Looking up private key for %s' % userid) d = keymanager.get_key(userid, private=True, fetch_remote=False) d.addCallbacks(_found_key, _if_not_found_generate) d.addCallback(self._on_keymanager_ready_cb, keymanager, userid) return d @defer.inlineCallbacks def send_if_outdated_key_in_nicknym(self, userid): keymanager = self.get_instance(userid) key = yield keymanager.get_key(userid, fetch_remote=False) try: remote = yield keymanager._nicknym.fetch_key_with_address(userid) except Exception: remote = "" if key.key_data != remote: yield keymanager.send_key() def _set_status(self, address, status, error=None, keys=None): self._status[address] = {"status": status, "error": error, "keys": keys} emit_async(catalog.MAIL_STATUS_CHANGED, address) def _on_keymanager_ready_cb(self, key, keymanager, userid): soledad = keymanager._soledad data = {'userid': userid, 'soledad': soledad, 'keymanager': keymanager} self.service.trigger_hook('on_new_keymanager_instance', **data) return key def _create_keymanager_instance(self, userid, token, uuid, soledad): user, provider = userid.split('@') nickserver_uri = self._get_nicknym_uri(provider) cert_path = _get_ca_cert_path(self._basedir, provider) api_uri = self._get_api_uri(provider) if not token: token = self.service.tokens.get(userid) km_args = (userid, nickserver_uri, soledad) km_kwargs = { "token": token, "uid": uuid, "api_uri": api_uri, "api_version": "1", "ca_cert_path": cert_path, "gpgbinary": get_gpg_bin_path() } keymanager = KeyManager(*km_args, **km_kwargs) return keymanager def _get_api_uri(self, provider): api_uri = config.Provider.get(provider).api_uri return api_uri def _get_nicknym_uri(self, provider): return 'https://nicknym.{provider}:6425'.format( provider=provider) class KeymanagerService(HookableService): log = Logger() def __init__(self, basedir=DEFAULT_BASEDIR): service.Service.__init__(self) self._basedir = basedir self._container = None def startService(self): self.log.debug('Starting Keymanager Service') self._container = KeymanagerContainer(self._basedir) self._container.service = self self.tokens = {} super(KeymanagerService, self).startService() # hooks def hook_on_new_soledad_instance(self, **kw): container = self._container user = kw['user'] token = kw['token'] uuid = kw['uuid'] soledad = kw['soledad'] if not container.get_instance(user): self.log.debug('Adding a new Keymanager instance for %s' % user) if not token: token = self.tokens.get(user) container.add_instance(user, token, uuid, soledad) def hook_on_soledad_first_sync(self, **kw): userid = kw['user'] d = self._container.get_or_generate_keys(userid) d.addCallback( lambda _: self._container.send_if_outdated_key_in_nicknym(userid)) def hook_on_bonafide_auth(self, **kw): userid = kw['username'] provider = _get_provider_from_full_userid(userid) provider.callWhenReady(self._hook_on_bonafide_auth, provider, **kw) def _hook_on_bonafide_auth(self, provider, **kw): if provider.offers_service('mx'): userid = kw['username'] token = kw['token'] container = self._container if container.get_instance(userid): self.log.debug( 'Passing a new SRP Token ' 'to Keymanager: %s' % userid) container.set_remote_auth_token(userid, token) else: self.log.debug('Storing the keymanager token... %s ' % token) self.tokens[userid] = token # commands def do_list_keys(self, userid, private=False): km = self._container.get_instance(userid) if km is None: return defer.fail(ValueError("User " + userid + " has no active " "keymanager")) d = km.get_all_keys(private=private) d.addCallback(lambda keys: [dict(key) for key in keys]) return d def do_export(self, userid, address, private=False, fetch_remote=False): km = self._container.get_instance(userid) if km is None: return defer.fail(ValueError("User " + userid + " has no active " "keymanager")) d = km.get_key(address, private=private, fetch_remote=fetch_remote) d.addCallback(lambda key: dict(key)) return d def do_fetch(self, userid, address, fingerprint): km = self._container.get_instance(userid) if km is None: return defer.fail(ValueError("User " + userid + " has no active " "keymanager")) d = km.fetch_key_fingerprint(address, fingerprint) d.addCallback(lambda key: dict(key)) return d def do_insert(self, userid, address, rawkey, validation='Fingerprint'): km = self._container.get_instance(userid) if km is None: return defer.fail(ValueError("User " + userid + " has no active " "keymanager")) validation = ValidationLevels.get(validation) d = km.put_raw_key(rawkey, address, validation=validation) d.addCallback(lambda _: km.get_key(address, fetch_remote=False)) d.addCallback(lambda key: dict(key)) return d @defer.inlineCallbacks def do_delete(self, userid, address, private=False): km = self._container.get_instance(userid) if km is None: raise ValueError("User " + userid + " has no active keymanager") key = yield km.get_key(address, private=private, fetch_remote=False) km.delete_key(key) defer.returnValue(key.fingerprint) def status(self, userid): return self._container.status(userid) class StandardMailService(service.MultiService, HookableService): """ A collection of Services. This is the parent service, that launches 3 different services that expose Encrypted Mail Capabilities on specific ports: - SMTP service, on port 2013 - IMAP service, on port 1984 - The IncomingMail Service, which doesn't listen on any port, but watches and processes the Incoming Queue and saves the processed mail into the matching INBOX. """ name = 'mail' log = Logger() # TODO factor out Mail Service to inside mail package. def __init__(self, basedir, mixnet_enabled=False): self._basedir = basedir self._soledad_sessions = {} self._keymanager_sessions = {} self._outgoing_sessions = {} self._service_tokens = {} self._mixnet_enabled = mixnet_enabled super(StandardMailService, self).__init__() self.initializeChildrenServices() def initializeChildrenServices(self): self.addService(IMAPService(self._soledad_sessions)) self.addService(SMTPService(self._outgoing_sessions, self._soledad_sessions)) # TODO adapt the service to receive soledad/keymanager sessions object. # See also the TODO before IncomingMailService.startInstance self.addService(IncomingMailService(self)) def startService(self): self.log.info('Starting Mail Service') super(StandardMailService, self).startService() def stopService(self): self.log.info('Stopping Mail service') super(StandardMailService, self).stopService() def startInstance(self, userid, soledad, keymanager): self._soledad_sessions[userid] = soledad self._keymanager_sessions[userid] = keymanager def registerToken(token): self._service_tokens[userid] = token return token incoming = self.getServiceNamed('incoming_mail') d = bouncerFactory(soledad) d.addCallback(self._create_outgoing_service, userid, keymanager, soledad) d.addCallback(lambda _: incoming.startInstance(userid)) d.addCallback( lambda _: soledad.get_or_create_service_token('mail_auth')) d.addCallback(registerToken) d.addCallback(self._write_tokens_file, userid) d.addCallback( self._maybe_start_pixelated, userid, soledad, keymanager) return d def _create_outgoing_service(self, bouncer, userid, keymanager, soledad): outgoing = OutgoingMail(userid, keymanager, bouncer) username, provider = userid.split('@') key = _get_smtp_client_cert_path(self._basedir, provider, username) prov = _get_provider_for_service('smtp', self._basedir, provider) hostname = prov.hostname port = prov.port if not os.path.isfile(key): raise errors.ConfigurationError( 'No valid SMTP certificate could be found for %s!' % userid) smtp_sender = SMTPSender(userid, key, hostname, port) outgoing.add_sender(smtp_sender) self._outgoing_sessions[userid] = outgoing # hooks def hook_on_new_keymanager_instance(self, **kw): # XXX we can specify this as a waterfall, or just AND the two # conditions. userid = kw['userid'] soledad = kw['soledad'] keymanager = kw['keymanager'] # TODO --- only start instance if "autostart" is True. self.startInstance(userid, soledad, keymanager) @defer.inlineCallbacks def hook_on_bonafide_auth(self, **kw): userid = kw['username'] self._maybe_start_incoming_service(userid) # TODO: if it's expired we should renew it yield self._maybe_fetch_smtp_certificate(userid) def _maybe_start_incoming_service(self, userid): """ try to turn on incoming mail service for the user that just logged in """ self.log.debug( 'Looking for incoming mail service for auth: %s' % userid) multiservice = self.getServiceNamed('incoming_mail') try: incoming = multiservice.getServiceNamed(userid) incoming.startService() except KeyError: self.log.debug('No incoming service for %s' % userid) @defer.inlineCallbacks def _maybe_fetch_smtp_certificate(self, userid): # check if smtp cert exists username, provider = userid.split('@') cert_path = _get_smtp_client_cert_path(self._basedir, provider, username) if os.path.exists(cert_path): defer.returnValue(None) # fetch smtp cert and store bonafide = self.parent.getServiceNamed("bonafide") _, cert_str = yield bonafide.do_get_smtp_cert(userid) cert_dir = os.path.dirname(cert_path) if not os.path.exists(cert_dir): os.makedirs(cert_dir, mode=0700) with open(cert_path, 'w') as outf: outf.write(cert_str) check_and_fix_urw_only(cert_path) def hook_on_bonafide_logout(self, **kw): username = kw.get('username', None) if username: multiservice = self.getServiceNamed('incoming_mail') try: incoming = multiservice.getServiceNamed(username) except KeyError: incoming = None if incoming: self.log.debug( 'looking for incoming mail service ' 'for logout: %s' % username) incoming.stopService() # commands @defer.inlineCallbacks def do_status(self, userid): smtp = self.getServiceNamed('smtp') imap = self.getServiceNamed('imap') keymanager = self.parent.getServiceNamed('keymanager') incoming = self.getServiceNamed('incoming_mail') incoming_status = yield incoming.status(userid) childrenStatus = { 'smtp': smtp.status(), 'imap': imap.status(), 'keymanager': keymanager.status(userid), 'incoming': incoming_status } defer.returnValue(merge_status(childrenStatus)) def do_mixnet_status(self, userid, address): # XXX: for now there is no support in the provider # we'll mock it if it's enabled provider = address.split('@')[1] if not self._mixnet_enabled: status = 'disabled' elif provider in ['panoramix-project.eu', 'riseup.net']: status = 'ok' else: status = 'unsuported' return {'status': status} def get_token(self, userid): token = self._service_tokens.get(userid) return {'user': userid, 'token': token} @defer.inlineCallbacks def do_msg_status(self, userid, mbox, msgid): account = self._get_account(userid) msg = yield account.get_message_by_msgid(mbox, msgid) if msg is None: raise Exception("Not found message id: " + msgid) headers = msg.get_headers() encryption = headers.get(IncomingMail.LEAP_ENCRYPTION_HEADER, '') signature = headers.get(IncomingMail.LEAP_SIGNATURE_HEADER, '') status = {} pubkey_re = re.compile(' pubkey="([0-9A-F]*)"') fingerprint = first(pubkey_re.findall(signature)) status['signature'] = signature.split(';')[0] status['sign_fp'] = fingerprint status['encryption'] = encryption if ((IncomingMail.LEAP_ENCRYPTION_DECRYPTED == encryption) and (IncomingMail.LEAP_SIGNATURE_VALID == status['signature'])): status['secured'] = True else: status['secured'] = False defer.returnValue(status) def do_msg_add(self, userid, raw_msg, mailbox=None): if not mailbox: mailbox = INBOX_NAME account = self._get_account(userid) d = account.get_collection_by_mailbox(mailbox) d.addCallback(lambda collection: collection.add_msg(raw_msg)) d.addCallback(lambda _: {'added': True}) return d # access to containers def get_soledad_session(self, userid): return self._soledad_sessions.get(userid) def get_keymanager_session(self, userid): return self._keymanager_sessions.get(userid) # other helpers def _write_tokens_file(self, token, userid): tokens_folder = os.path.join(tempfile.gettempdir(), "bitmask_tokens") if os.path.exists(tokens_folder): try: shutil.rmtree(tokens_folder) except OSError as e: self.log.warn("Can't remove tokens folder %s: %s" % (tokens_folder, e)) return os.mkdir(tokens_folder, 0700) tokens_path = os.path.join(tokens_folder, "%s.json" % (userid,)) token_dict = {'mail_auth': self._service_tokens[userid]} with open(tokens_path, 'w') as ftokens: json.dump(token_dict, ftokens) def _maybe_start_pixelated(self, passthrough, userid, soledad, keymanager): account = self._get_account(userid) if HAS_MUA and pixelizer.HAS_PIXELATED: pixelizer.start_pixelated_user_agent( userid, soledad, keymanager, account) return passthrough def _get_account(self, userid): incoming = self.getServiceNamed('incoming_mail') return incoming.getServiceNamed(userid).account class IMAPService(service.Service): name = 'imap' log = Logger() def __init__(self, soledad_sessions): self._soledad_sessions = soledad_sessions self._port = None self._factory = None super(IMAPService, self).__init__() def startService(self): if not HAS_MAIL: self.log.info('Mail module not found') return self.log.info('Starting IMAP Service') port, factory = imap_service.run_service( self._soledad_sessions, factory=self._factory) self._port = port self._factory = factory super(IMAPService, self).startService() def stopService(self): self.log.info('Stopping IMAP Service') if self._port: self._port.stopListening() self._port = None if self._factory: self._factory.doStop() super(IMAPService, self).stopService() def status(self): return { 'status': 'on' if self.running else 'off', 'error': None } class SMTPService(service.Service): name = 'smtp' log = Logger() def __init__(self, outgoing_sessions, soledad_sessions, basedir=DEFAULT_BASEDIR): self._basedir = os.path.expanduser(basedir) self._outgoing_sessions = outgoing_sessions self._soledad_sessions = soledad_sessions self._port = None self._factory = None super(SMTPService, self).__init__() def startService(self): if not HAS_MAIL: self.log.info('Mail module not found') return self.log.info('starting smtp service') port, factory = smtp_service.run_service( self._outgoing_sessions, self._soledad_sessions, factory=self._factory) self._port = port self._factory = factory super(SMTPService, self).startService() def stopService(self): self.log.info('Stopping SMTP Service') if self._port: self._port.stopListening() self._port = None if self._factory: self._factory.doStop() super(SMTPService, self).stopService() def status(self): return { 'status': 'on' if self.running else 'off', 'error': None } class IncomingMailService(service.MultiService): """ Manage child services that check for incoming mail for individual users. """ name = 'incoming_mail' log = Logger() def __init__(self, mail_service): super(IncomingMailService, self).__init__() self._mail = mail_service self._status = {} def startService(self): self.log.info('Starting Incoming Mail Service') super(IncomingMailService, self).startService() def stopService(self): super(IncomingMailService, self).stopService() # Individual accounts def startInstance(self, userid): """returns: a deferred""" self._set_status(userid, "starting") soledad = self._mail.get_soledad_session(userid) keymanager = self._mail.get_keymanager_session(userid) self.log.info('Setting up Incoming Mail Service for %s' % userid) return self._start_incoming_mail_instance( keymanager, soledad, userid) @defer.inlineCallbacks def status(self, userid): if userid not in self._status: defer.returnValue({'status': 'off', 'error': None, 'unread': None}) status = self._status[userid] if status['status'] == 'on': incoming = self.getServiceNamed(userid) status['unread'] = yield incoming.unread() defer.returnValue(status) def _set_status(self, address, status, error=None, unread=None): self._status[address] = {"status": status, "error": error, "unread": unread} emit_async(catalog.MAIL_STATUS_CHANGED, address) def _start_incoming_mail_instance(self, keymanager, soledad, userid, start_sync=True): def setUpIncomingMail(inbox, acc): incoming_mail = IncomingMail( keymanager, soledad, inbox, userid, check_period=INCOMING_CHECK_PERIOD) incoming_mail.account = acc self.log.debug('Setting Incoming Mail Service for %s' % userid) incoming_mail.setName(userid) self.addService(incoming_mail) return incoming_mail def setStatusOn(res): self._set_status(userid, "on") return res # XXX ---------------------------------------------------------------- # TODO we probably want to enforce a SINGLE ACCOUNT INSTANCE # earlier in the bootstrap process (ie, upper in the hierarchy of # services) so that the single instance can be shared by the imap and # the pixelated mua. # XXX ---------------------------------------------------------------- acc = Account(soledad, userid) d = acc.callWhenReady( lambda _: acc.get_collection_by_mailbox(INBOX_NAME)) d.addCallback(setUpIncomingMail, acc) d.addCallback(setStatusOn) d.addErrback(self._errback, userid) return d def _errback(self, failure, userid): self._set_status(userid, "failed", error=str(failure)) self.log.failure('failed!') # -------------------------------------------------------------------- # # config utilities. should be moved to bonafide # SERVICES = ('soledad', 'smtp', 'vpn') Provider = namedtuple( 'Provider', ['hostname', 'ip_address', 'location', 'port']) def _get_ca_cert_path(basedir, provider): path = os.path.join( basedir, 'providers', provider, 'keys', 'ca', 'cacert.pem') return path def _get_smtp_client_cert_path(basedir, provider, username): path = os.path.join( basedir, 'providers', provider, 'keys', 'client', 'smtp_%s.pem' % username) return path def _get_config_for_service(service, basedir, provider): if service not in SERVICES: raise ImproperlyConfigured('Tried to use an unknown service') config_path = os.path.join( basedir, 'providers', provider, '%s-service.json' % service) try: with open(config_path) as config: config = json.loads(config.read()) except IOError: # FIXME might be that the provider DOES NOT offer this service! raise ImproperlyConfigured( 'could not open config file %s' % config_path) else: return config def _pick_server(config, strategy=None): """ Picks a server from a list of possible choices. The service files have a . The default implementation just picks the FIRST available server. """ if strategy is None: strategy = first servers = config['hosts'].keys() choice = config['hosts'][strategy(servers)] return choice def _get_subdict(d, keys): return {key: d.get(key) for key in keys} def _get_provider_for_service(service, basedir, provider): if service not in SERVICES: raise ImproperlyConfigured('Tried to use an unknown service') config = _get_config_for_service(service, basedir, provider) p = _pick_server(config) attrs = _get_subdict(p, ('hostname', 'ip_address', 'location', 'port')) provider = Provider(**attrs) return provider def _get_smtp_uri(basedir, provider): prov = _get_provider_for_service('smtp', basedir, provider) url = 'https://{hostname}:{port}'.format( hostname=prov.hostname, port=prov.port) return url def _get_soledad_uri(basedir, provider): prov = _get_provider_for_service('soledad', basedir, provider) url = 'https://{hostname}:{port}'.format( hostname=prov.hostname, port=prov.port) return url