114 lines
3.7 KiB
Python
114 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2019 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# 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
|
|
|
|
|
|
class ThirdPartyEventRules(object):
|
|
"""Allows server admins to provide a Python module implementing an extra
|
|
set of rules to apply when processing events.
|
|
|
|
This is designed to help admins of closed federations with enforcing custom
|
|
behaviours.
|
|
"""
|
|
|
|
def __init__(self, hs):
|
|
self.third_party_rules = None
|
|
|
|
self.store = hs.get_datastore()
|
|
|
|
module = None
|
|
config = None
|
|
if hs.config.third_party_event_rules:
|
|
module, config = hs.config.third_party_event_rules
|
|
|
|
if module is not None:
|
|
self.third_party_rules = module(
|
|
config=config, http_client=hs.get_simple_http_client()
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def check_event_allowed(self, event, context):
|
|
"""Check if a provided event should be allowed in the given context.
|
|
|
|
Args:
|
|
event (synapse.events.EventBase): The event to be checked.
|
|
context (synapse.events.snapshot.EventContext): The context of the event.
|
|
|
|
Returns:
|
|
defer.Deferred[bool]: True if the event should be allowed, False if not.
|
|
"""
|
|
if self.third_party_rules is None:
|
|
return True
|
|
|
|
prev_state_ids = yield context.get_prev_state_ids(self.store)
|
|
|
|
# Retrieve the state events from the database.
|
|
state_events = {}
|
|
for key, event_id in prev_state_ids.items():
|
|
state_events[key] = yield self.store.get_event(event_id, allow_none=True)
|
|
|
|
ret = yield self.third_party_rules.check_event_allowed(event, state_events)
|
|
return ret
|
|
|
|
@defer.inlineCallbacks
|
|
def on_create_room(self, requester, config, is_requester_admin):
|
|
"""Intercept requests to create room to allow, deny or update the
|
|
request config.
|
|
|
|
Args:
|
|
requester (Requester)
|
|
config (dict): The creation config from the client.
|
|
is_requester_admin (bool): If the requester is an admin
|
|
|
|
Returns:
|
|
defer.Deferred
|
|
"""
|
|
|
|
if self.third_party_rules is None:
|
|
return
|
|
|
|
yield self.third_party_rules.on_create_room(
|
|
requester, config, is_requester_admin
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def check_threepid_can_be_invited(self, medium, address, room_id):
|
|
"""Check if a provided 3PID can be invited in the given room.
|
|
|
|
Args:
|
|
medium (str): The 3PID's medium.
|
|
address (str): The 3PID's address.
|
|
room_id (str): The room we want to invite the threepid to.
|
|
|
|
Returns:
|
|
defer.Deferred[bool], True if the 3PID can be invited, False if not.
|
|
"""
|
|
|
|
if self.third_party_rules is None:
|
|
return True
|
|
|
|
state_ids = yield self.store.get_filtered_current_state_ids(room_id)
|
|
room_state_events = yield self.store.get_events(state_ids.values())
|
|
|
|
state_events = {}
|
|
for key, event_id in state_ids.items():
|
|
state_events[key] = room_state_events[event_id]
|
|
|
|
ret = yield self.third_party_rules.check_threepid_can_be_invited(
|
|
medium, address, state_events
|
|
)
|
|
return ret
|