139 lines
5.1 KiB
Python
139 lines
5.1 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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import logging
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from twisted.internet import defer
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import synapse.types
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from synapse.api.constants import Membership, EventTypes
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from synapse.api.errors import LimitExceededError
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from synapse.types import UserID
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logger = logging.getLogger(__name__)
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class BaseHandler(object):
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"""
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Common base class for the event handlers.
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Attributes:
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store (synapse.storage.DataStore):
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state_handler (synapse.state.StateHandler):
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"""
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer):
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"""
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self.store = hs.get_datastore()
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self.auth = hs.get_auth()
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self.notifier = hs.get_notifier()
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self.state_handler = hs.get_state_handler()
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self.distributor = hs.get_distributor()
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self.ratelimiter = hs.get_ratelimiter()
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self.clock = hs.get_clock()
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self.hs = hs
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self.server_name = hs.hostname
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self.event_builder_factory = hs.get_event_builder_factory()
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def ratelimit(self, requester):
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time_now = self.clock.time()
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user_id = requester.user.to_string()
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# The AS user itself is never rate limited.
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app_service = self.store.get_app_service_by_user_id(user_id)
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if app_service is not None:
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return # do not ratelimit app service senders
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# Disable rate limiting of users belonging to any AS that is configured
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# not to be rate limited in its registration file (rate_limited: true|false).
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if requester.app_service and not requester.app_service.is_rate_limited():
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return
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allowed, time_allowed = self.ratelimiter.send_message(
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user_id, time_now,
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msg_rate_hz=self.hs.config.rc_messages_per_second,
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burst_count=self.hs.config.rc_message_burst_count,
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)
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if not allowed:
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raise LimitExceededError(
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retry_after_ms=int(1000 * (time_allowed - time_now)),
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)
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@defer.inlineCallbacks
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def maybe_kick_guest_users(self, event, context=None):
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# Technically this function invalidates current_state by changing it.
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# Hopefully this isn't that important to the caller.
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if event.type == EventTypes.GuestAccess:
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guest_access = event.content.get("guest_access", "forbidden")
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if guest_access != "can_join":
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if context:
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current_state = yield self.store.get_events(
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context.current_state_ids.values()
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)
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current_state = current_state.values()
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else:
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current_state = yield self.store.get_current_state(event.room_id)
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logger.info("maybe_kick_guest_users %r", current_state)
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yield self.kick_guest_users(current_state)
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@defer.inlineCallbacks
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def kick_guest_users(self, current_state):
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for member_event in current_state:
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try:
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if member_event.type != EventTypes.Member:
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continue
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target_user = UserID.from_string(member_event.state_key)
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if not self.hs.is_mine(target_user):
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continue
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if member_event.content["membership"] not in {
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Membership.JOIN,
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Membership.INVITE
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}:
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continue
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if (
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"kind" not in member_event.content
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or member_event.content["kind"] != "guest"
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):
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continue
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# We make the user choose to leave, rather than have the
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# event-sender kick them. This is partially because we don't
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# need to worry about power levels, and partially because guest
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# users are a concept which doesn't hugely work over federation,
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# and having homeservers have their own users leave keeps more
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# of that decision-making and control local to the guest-having
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# homeserver.
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requester = synapse.types.create_requester(
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target_user, is_guest=True)
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handler = self.hs.get_handlers().room_member_handler
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yield handler.update_membership(
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requester,
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target_user,
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member_event.room_id,
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"leave",
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ratelimit=False,
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)
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except Exception as e:
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logger.warn("Error kicking guest user: %s" % (e,))
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