260 lines
8.8 KiB
Python
260 lines
8.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from ._base import BaseHandler
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from synapse.api.errors import SynapseError, Codes, CodeMessageException
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from synapse.api.constants import EventTypes
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from synapse.types import RoomAlias
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import logging
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import string
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logger = logging.getLogger(__name__)
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class DirectoryHandler(BaseHandler):
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def __init__(self, hs):
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super(DirectoryHandler, self).__init__(hs)
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self.federation = hs.get_replication_layer()
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self.federation.register_query_handler(
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"directory", self.on_directory_query
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)
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@defer.inlineCallbacks
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def _create_association(self, room_alias, room_id, servers=None):
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# general association creation for both human users and app services
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for wchar in string.whitespace:
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if wchar in room_alias.localpart:
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raise SynapseError(400, "Invalid characters in room alias")
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if not self.hs.is_mine(room_alias):
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raise SynapseError(400, "Room alias must be local")
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# TODO(erikj): Change this.
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# TODO(erikj): Add transactions.
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# TODO(erikj): Check if there is a current association.
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if not servers:
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servers = yield self.store.get_joined_hosts_for_room(room_id)
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if not servers:
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raise SynapseError(400, "Failed to get server list")
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yield self.store.create_room_alias_association(
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room_alias,
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room_id,
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servers
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)
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@defer.inlineCallbacks
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def create_association(self, user_id, room_alias, room_id, servers=None):
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# association creation for human users
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# TODO(erikj): Do user auth.
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can_create = yield self.can_modify_alias(
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room_alias,
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user_id=user_id
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)
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if not can_create:
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raise SynapseError(
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400, "This alias is reserved by an application service.",
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errcode=Codes.EXCLUSIVE
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)
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yield self._create_association(room_alias, room_id, servers)
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@defer.inlineCallbacks
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def create_appservice_association(self, service, room_alias, room_id,
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servers=None):
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if not service.is_interested_in_alias(room_alias.to_string()):
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raise SynapseError(
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400, "This application service has not reserved"
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" this kind of alias.", errcode=Codes.EXCLUSIVE
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)
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# association creation for app services
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yield self._create_association(room_alias, room_id, servers)
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@defer.inlineCallbacks
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def delete_association(self, user_id, room_alias):
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# association deletion for human users
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# TODO Check if server admin
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can_delete = yield self.can_modify_alias(
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room_alias,
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user_id=user_id
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)
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if not can_delete:
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raise SynapseError(
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400, "This alias is reserved by an application service.",
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errcode=Codes.EXCLUSIVE
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)
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yield self._delete_association(room_alias)
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@defer.inlineCallbacks
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def delete_appservice_association(self, service, room_alias):
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if not service.is_interested_in_alias(room_alias.to_string()):
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raise SynapseError(
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400,
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"This application service has not reserved this kind of alias",
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errcode=Codes.EXCLUSIVE
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)
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yield self._delete_association(room_alias)
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@defer.inlineCallbacks
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def _delete_association(self, room_alias):
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if not self.hs.is_mine(room_alias):
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raise SynapseError(400, "Room alias must be local")
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yield self.store.delete_room_alias(room_alias)
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# TODO - Looks like _update_room_alias_event has never been implemented
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# if room_id:
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# yield self._update_room_alias_events(user_id, room_id)
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@defer.inlineCallbacks
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def get_association(self, room_alias):
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room_id = None
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if self.hs.is_mine(room_alias):
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result = yield self.get_association_from_room_alias(
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room_alias
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)
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if result:
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room_id = result.room_id
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servers = result.servers
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else:
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try:
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result = yield self.federation.make_query(
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destination=room_alias.domain,
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query_type="directory",
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args={
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"room_alias": room_alias.to_string(),
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},
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retry_on_dns_fail=False,
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)
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except CodeMessageException as e:
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logging.warn("Error retrieving alias")
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if e.code == 404:
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result = None
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else:
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raise
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if result and "room_id" in result and "servers" in result:
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room_id = result["room_id"]
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servers = result["servers"]
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if not room_id:
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raise SynapseError(
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404,
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"Room alias %s not found" % (room_alias.to_string(),),
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Codes.NOT_FOUND
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)
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extra_servers = yield self.store.get_joined_hosts_for_room(room_id)
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servers = set(extra_servers) | set(servers)
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# If this server is in the list of servers, return it first.
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if self.server_name in servers:
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servers = (
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[self.server_name]
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+ [s for s in servers if s != self.server_name]
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)
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else:
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servers = list(servers)
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defer.returnValue({
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"room_id": room_id,
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"servers": servers,
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})
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return
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@defer.inlineCallbacks
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def on_directory_query(self, args):
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room_alias = RoomAlias.from_string(args["room_alias"])
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if not self.hs.is_mine(room_alias):
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raise SynapseError(
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400, "Room Alias is not hosted on this Home Server"
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)
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result = yield self.get_association_from_room_alias(
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room_alias
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)
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if result is not None:
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defer.returnValue({
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"room_id": result.room_id,
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"servers": result.servers,
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})
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else:
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raise SynapseError(
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404,
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"Room alias %r not found" % (room_alias.to_string(),),
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Codes.NOT_FOUND
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)
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@defer.inlineCallbacks
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def send_room_alias_update_event(self, user_id, room_id):
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aliases = yield self.store.get_aliases_for_room(room_id)
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msg_handler = self.hs.get_handlers().message_handler
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yield msg_handler.create_and_send_event({
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"type": EventTypes.Aliases,
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"state_key": self.hs.hostname,
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"room_id": room_id,
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"sender": user_id,
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"content": {"aliases": aliases},
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}, ratelimit=False)
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@defer.inlineCallbacks
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def get_association_from_room_alias(self, room_alias):
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result = yield self.store.get_association_from_room_alias(
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room_alias
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)
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if not result:
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# Query AS to see if it exists
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as_handler = self.hs.get_handlers().appservice_handler
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result = yield as_handler.query_room_alias_exists(room_alias)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def can_modify_alias(self, alias, user_id=None):
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# Any application service "interested" in an alias they are regexing on
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# can modify the alias.
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# Users can only modify the alias if ALL the interested services have
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# non-exclusive locks on the alias (or there are no interested services)
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services = yield self.store.get_app_services()
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interested_services = [
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s for s in services if s.is_interested_in_alias(alias.to_string())
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]
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for service in interested_services:
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if user_id == service.sender:
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# this user IS the app service so they can do whatever they like
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defer.returnValue(True)
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return
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elif service.is_exclusive_alias(alias.to_string()):
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# another service has an exclusive lock on this alias.
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defer.returnValue(False)
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return
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# either no interested services, or no service with an exclusive lock
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defer.returnValue(True)
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