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# -*- coding: utf-8 -*-
# Copyright 2014 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 synapse.api.errors import LimitExceededError
from synapse.util.async import run_on_reactor
from synapse.crypto.event_signing import add_hashes_and_signatures
from synapse.api.events.room import (
RoomCreateEvent, RoomMemberEvent, RoomPowerLevelsEvent, RoomJoinRulesEvent,
)
from synapse.api.constants import Membership, JoinRules
from syutil.base64util import encode_base64
import logging
logger = logging.getLogger(__name__)
class BaseHandler(object):
def __init__(self, hs):
self.store = hs.get_datastore()
self.event_factory = hs.get_event_factory()
self.auth = hs.get_auth()
self.notifier = hs.get_notifier()
self.room_lock = hs.get_room_lock_manager()
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.signing_key = hs.config.signing_key[0]
self.server_name = hs.hostname
def ratelimit(self, user_id):
time_now = self.clock.time()
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 _add_auth(self, event):
if event.type == RoomCreateEvent.TYPE:
event.auth_events = []
return
auth_events = []
key = (RoomPowerLevelsEvent.TYPE, "", )
power_level_event = event.old_state_events.get(key)
if power_level_event:
auth_events.append(power_level_event.event_id)
key = (RoomJoinRulesEvent.TYPE, "", )
join_rule_event = event.old_state_events.get(key)
key = (RoomMemberEvent.TYPE, event.user_id, )
member_event = event.old_state_events.get(key)
if join_rule_event:
join_rule = join_rule_event.content.get("join_rule")
is_public = join_rule == JoinRules.PUBLIC if join_rule else False
if event.type == RoomMemberEvent.TYPE:
if event.content["membership"] == Membership.JOIN:
if is_public:
auth_events.append(join_rule_event.event_id)
elif member_event:
auth_events.append(member_event.event_id)
if member_event:
if member_event.content["membership"] == Membership.JOIN:
auth_events.append(member_event.event_id)
hashes = yield self.store.get_event_reference_hashes(
auth_events
)
hashes = [
{
k: encode_base64(v) for k, v in h.items()
if k == "sha256"
}
for h in hashes
]
event.auth_events = zip(auth_events, hashes)
@defer.inlineCallbacks
def _on_new_room_event(self, event, snapshot, extra_destinations=[],
extra_users=[], suppress_auth=False):
yield run_on_reactor()
snapshot.fill_out_prev_events(event)
yield self.state_handler.annotate_state_groups(event)
yield self._add_auth(event)
logger.debug("Signing event...")
add_hashes_and_signatures(
event, self.server_name, self.signing_key
)
logger.debug("Signed event.")
if not suppress_auth:
logger.debug("Authing...")
self.auth.check(event, raises=True)
logger.debug("Authed")
else:
logger.debug("Suppressed auth.")
yield self.store.persist_event(event)
destinations = set(extra_destinations)
# Send a PDU to all hosts who have joined the room.
destinations.update((yield self.store.get_joined_hosts_for_room(
event.room_id
)))
event.destinations = list(destinations)
self.notifier.on_new_room_event(event, extra_users=extra_users)
federation_handler = self.hs.get_handlers().federation_handler
yield federation_handler.handle_new_event(event, snapshot)
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