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# -*- coding: utf-8 -*-
# Copyright 2014, 2015 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from twisted.internet import defer
from ._base import BaseHandler
from synapse.api.errors import SynapseError, Codes, CodeMessageException
from synapse.api.constants import EventTypes
from synapse.types import RoomAlias
import logging
logger = logging.getLogger(__name__)
class DirectoryHandler(BaseHandler):
def __init__(self, hs):
super(DirectoryHandler, self).__init__(hs)
self.federation = hs.get_replication_layer()
self.federation.register_query_handler(
"directory", self.on_directory_query
)
@defer.inlineCallbacks
def _create_association(self, room_alias, room_id, servers=None):
# general association creation for both human users and app services
if not self.hs.is_mine(room_alias):
raise SynapseError(400, "Room alias must be local")
# TODO(erikj): Change this.
# TODO(erikj): Add transactions.
# TODO(erikj): Check if there is a current association.
if not servers:
servers = yield self.store.get_joined_hosts_for_room(room_id)
if not servers:
raise SynapseError(400, "Failed to get server list")
yield self.store.create_room_alias_association(
room_alias,
room_id,
servers
)
@defer.inlineCallbacks
def create_association(self, user_id, room_alias, room_id, servers=None):
# association creation for human users
# TODO(erikj): Do user auth.
is_claimed = yield self.is_alias_exclusive_to_appservices(room_alias)
if is_claimed:
raise SynapseError(
400, "This alias is reserved by an application service.",
errcode=Codes.EXCLUSIVE
)
yield self._create_association(room_alias, room_id, servers)
@defer.inlineCallbacks
def create_appservice_association(self, service, room_alias, room_id,
servers=None):
if not service.is_interested_in_alias(room_alias.to_string()):
raise SynapseError(
400, "This application service has not reserved"
" this kind of alias.", errcode=Codes.EXCLUSIVE
)
# association creation for app services
yield self._create_association(room_alias, room_id, servers)
@defer.inlineCallbacks
def delete_association(self, user_id, room_alias):
# association deletion for human users
# TODO Check if server admin
is_claimed = yield self.is_alias_exclusive_to_appservices(room_alias)
if is_claimed:
raise SynapseError(
400, "This alias is reserved by an application service.",
errcode=Codes.EXCLUSIVE
)
yield self._delete_association(room_alias)
@defer.inlineCallbacks
def delete_appservice_association(self, service, room_alias):
if not service.is_interested_in_alias(room_alias.to_string()):
raise SynapseError(
400,
"This application service has not reserved this kind of alias",
errcode=Codes.EXCLUSIVE
)
yield self._delete_association(room_alias)
@defer.inlineCallbacks
def _delete_association(self, room_alias):
if not self.hs.is_mine(room_alias):
raise SynapseError(400, "Room alias must be local")
yield self.store.delete_room_alias(room_alias)
# TODO - Looks like _update_room_alias_event has never been implemented
# if room_id:
# yield self._update_room_alias_events(user_id, room_id)
@defer.inlineCallbacks
def get_association(self, room_alias):
room_id = None
if self.hs.is_mine(room_alias):
result = yield self.get_association_from_room_alias(
room_alias
)
if result:
room_id = result.room_id
servers = result.servers
else:
try:
result = yield self.federation.make_query(
destination=room_alias.domain,
query_type="directory",
args={
"room_alias": room_alias.to_string(),
},
retry_on_dns_fail=False,
)
except CodeMessageException as e:
logging.warn("Error retrieving alias")
if e.code == 404:
result = None
else:
raise
if result and "room_id" in result and "servers" in result:
room_id = result["room_id"]
servers = result["servers"]
if not room_id:
raise SynapseError(
404,
"Room alias %r not found" % (room_alias.to_string(),),
Codes.NOT_FOUND
)
extra_servers = yield self.store.get_joined_hosts_for_room(room_id)
servers = set(extra_servers) | set(servers)
# If this server is in the list of servers, return it first.
if self.server_name in servers:
servers = (
[self.server_name]
+ [s for s in servers if s != self.server_name]
)
else:
servers = list(servers)
defer.returnValue({
"room_id": room_id,
"servers": servers,
})
return
@defer.inlineCallbacks
def on_directory_query(self, args):
room_alias = RoomAlias.from_string(args["room_alias"])
if not self.hs.is_mine(room_alias):
raise SynapseError(
400, "Room Alias is not hosted on this Home Server"
)
result = yield self.get_association_from_room_alias(
room_alias
)
if result is not None:
defer.returnValue({
"room_id": result.room_id,
"servers": result.servers,
})
else:
raise SynapseError(
404,
"Room alias %r not found" % (room_alias.to_string(),),
Codes.NOT_FOUND
)
@defer.inlineCallbacks
def send_room_alias_update_event(self, user_id, room_id):
aliases = yield self.store.get_aliases_for_room(room_id)
msg_handler = self.hs.get_handlers().message_handler
yield msg_handler.create_and_send_event({
"type": EventTypes.Aliases,
"state_key": self.hs.hostname,
"room_id": room_id,
"sender": user_id,
"content": {"aliases": aliases},
}, ratelimit=False)
@defer.inlineCallbacks
def get_association_from_room_alias(self, room_alias):
result = yield self.store.get_association_from_room_alias(
room_alias
)
if not result:
# Query AS to see if it exists
as_handler = self.hs.get_handlers().appservice_handler
result = yield as_handler.query_room_alias_exists(room_alias)
defer.returnValue(result)
@defer.inlineCallbacks
def is_alias_exclusive_to_appservices(self, alias):
services = yield self.store.get_app_services()
interested_services = [
s for s in services if s.is_interested_in_alias(alias.to_string())
]
defer.returnValue(len(interested_services) > 0)
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