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# -*- coding: utf-8 -*-
# Copyright 2014 - 2016 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.
import logging
from twisted.internet import defer
import synapse.types
from synapse.api.constants import Membership, EventTypes
from synapse.api.errors import LimitExceededError
from synapse.types import UserID
logger = logging.getLogger(__name__)
class BaseHandler(object):
"""
Common base class for the event handlers.
Attributes:
store (synapse.storage.DataStore):
state_handler (synapse.state.StateHandler):
"""
def __init__(self, hs):
"""
Args:
hs (synapse.server.HomeServer):
"""
self.store = hs.get_datastore()
self.auth = hs.get_auth()
self.notifier = hs.get_notifier()
self.state_handler = hs.get_state_handler()
self.distributor = hs.get_distributor()
self.ratelimiter = hs.get_ratelimiter()
self.clock = hs.get_clock()
self.hs = hs
self.server_name = hs.hostname
self.event_builder_factory = hs.get_event_builder_factory()
def ratelimit(self, requester):
time_now = self.clock.time()
user_id = requester.user.to_string()
# The AS user itself is never rate limited.
app_service = self.store.get_app_service_by_user_id(user_id)
if app_service is not None:
return # do not ratelimit app service senders
# Disable rate limiting of users belonging to any AS that is configured
# not to be rate limited in its registration file (rate_limited: true|false).
if requester.app_service and not requester.app_service.is_rate_limited():
return
allowed, time_allowed = self.ratelimiter.send_message(
user_id, time_now,
msg_rate_hz=self.hs.config.rc_messages_per_second,
burst_count=self.hs.config.rc_message_burst_count,
)
if not allowed:
raise LimitExceededError(
retry_after_ms=int(1000 * (time_allowed - time_now)),
)
@defer.inlineCallbacks
def maybe_kick_guest_users(self, event, context=None):
# Technically this function invalidates current_state by changing it.
# Hopefully this isn't that important to the caller.
if event.type == EventTypes.GuestAccess:
guest_access = event.content.get("guest_access", "forbidden")
if guest_access != "can_join":
if context:
current_state = yield self.store.get_events(
context.current_state_ids.values()
)
current_state = current_state.values()
else:
current_state = yield self.store.get_current_state(event.room_id)
logger.info("maybe_kick_guest_users %r", current_state)
yield self.kick_guest_users(current_state)
@defer.inlineCallbacks
def kick_guest_users(self, current_state):
for member_event in current_state:
try:
if member_event.type != EventTypes.Member:
continue
target_user = UserID.from_string(member_event.state_key)
if not self.hs.is_mine(target_user):
continue
if member_event.content["membership"] not in {
Membership.JOIN,
Membership.INVITE
}:
continue
if (
"kind" not in member_event.content
or member_event.content["kind"] != "guest"
):
continue
# We make the user choose to leave, rather than have the
# event-sender kick them. This is partially because we don't
# need to worry about power levels, and partially because guest
# users are a concept which doesn't hugely work over federation,
# and having homeservers have their own users leave keeps more
# of that decision-making and control local to the guest-having
# homeserver.
requester = synapse.types.create_requester(
target_user, is_guest=True)
handler = self.hs.get_handlers().room_member_handler
yield handler.update_membership(
requester,
target_user,
member_event.room_id,
"leave",
ratelimit=False,
)
except Exception as e:
logger.warn("Error kicking guest user: %s" % (e,))
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