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7b06f85c0e
This bug was discovered by DINUM. We were modifying `serialized_event["content"]`, which - if you've got `USE_FROZEN_DICTS` turned on or are [using a third party rules module](17cd48fe51/synapse/events/third_party_rules.py (L73-L76)) - will raise a 500 if you try to a edit a reply to a message.
`serialized_event["content"]` could be set to the edit event's content, instead of a copy of it, which is bad as we attempt to modify it. Instead, we also end up modifying the original event's content. DINUM uses a third party rules module, which meant the event's content got frozen and thus an exception was raised.
To be clear, the problem is not that the event's content was frozen. In fact doing so helped us uncover the fact we weren't copying event content correctly.
247 lines
8.5 KiB
Python
247 lines
8.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2019 The Matrix.org Foundation C.I.C.
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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 threading
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from typing import Dict
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from mock import Mock
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from synapse.events import EventBase
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from synapse.module_api import ModuleApi
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from synapse.rest import admin
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from synapse.rest.client.v1 import login, room
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from synapse.types import Requester, StateMap
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from tests import unittest
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thread_local = threading.local()
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class ThirdPartyRulesTestModule:
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def __init__(self, config: Dict, module_api: ModuleApi):
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# keep a record of the "current" rules module, so that the test can patch
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# it if desired.
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thread_local.rules_module = self
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self.module_api = module_api
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async def on_create_room(
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self, requester: Requester, config: dict, is_requester_admin: bool
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):
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return True
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async def check_event_allowed(self, event: EventBase, state: StateMap[EventBase]):
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return True
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@staticmethod
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def parse_config(config):
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return config
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def current_rules_module() -> ThirdPartyRulesTestModule:
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return thread_local.rules_module
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class ThirdPartyRulesTestCase(unittest.HomeserverTestCase):
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servlets = [
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admin.register_servlets,
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login.register_servlets,
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room.register_servlets,
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]
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def default_config(self):
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config = super().default_config()
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config["third_party_event_rules"] = {
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"module": __name__ + ".ThirdPartyRulesTestModule",
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"config": {},
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}
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return config
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def prepare(self, reactor, clock, homeserver):
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# Create a user and room to play with during the tests
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self.user_id = self.register_user("kermit", "monkey")
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self.tok = self.login("kermit", "monkey")
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self.room_id = self.helper.create_room_as(self.user_id, tok=self.tok)
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def test_third_party_rules(self):
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"""Tests that a forbidden event is forbidden from being sent, but an allowed one
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can be sent.
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"""
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# patch the rules module with a Mock which will return False for some event
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# types
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async def check(ev, state):
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return ev.type != "foo.bar.forbidden"
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callback = Mock(spec=[], side_effect=check)
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current_rules_module().check_event_allowed = callback
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channel = self.make_request(
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"PUT",
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"/_matrix/client/r0/rooms/%s/send/foo.bar.allowed/1" % self.room_id,
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{},
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access_token=self.tok,
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)
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self.assertEquals(channel.result["code"], b"200", channel.result)
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callback.assert_called_once()
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# there should be various state events in the state arg: do some basic checks
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state_arg = callback.call_args[0][1]
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for k in (("m.room.create", ""), ("m.room.member", self.user_id)):
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self.assertIn(k, state_arg)
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ev = state_arg[k]
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self.assertEqual(ev.type, k[0])
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self.assertEqual(ev.state_key, k[1])
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channel = self.make_request(
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"PUT",
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"/_matrix/client/r0/rooms/%s/send/foo.bar.forbidden/2" % self.room_id,
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{},
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access_token=self.tok,
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)
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self.assertEquals(channel.result["code"], b"403", channel.result)
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def test_cannot_modify_event(self):
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"""cannot accidentally modify an event before it is persisted"""
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# first patch the event checker so that it will try to modify the event
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async def check(ev: EventBase, state):
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ev.content = {"x": "y"}
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return True
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current_rules_module().check_event_allowed = check
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# now send the event
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channel = self.make_request(
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"PUT",
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"/_matrix/client/r0/rooms/%s/send/modifyme/1" % self.room_id,
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{"x": "x"},
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access_token=self.tok,
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)
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self.assertEqual(channel.result["code"], b"500", channel.result)
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def test_modify_event(self):
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"""The module can return a modified version of the event"""
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# first patch the event checker so that it will modify the event
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async def check(ev: EventBase, state):
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d = ev.get_dict()
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d["content"] = {"x": "y"}
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return d
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current_rules_module().check_event_allowed = check
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# now send the event
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channel = self.make_request(
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"PUT",
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"/_matrix/client/r0/rooms/%s/send/modifyme/1" % self.room_id,
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{"x": "x"},
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access_token=self.tok,
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)
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self.assertEqual(channel.result["code"], b"200", channel.result)
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event_id = channel.json_body["event_id"]
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# ... and check that it got modified
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channel = self.make_request(
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"GET",
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"/_matrix/client/r0/rooms/%s/event/%s" % (self.room_id, event_id),
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access_token=self.tok,
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)
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self.assertEqual(channel.result["code"], b"200", channel.result)
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ev = channel.json_body
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self.assertEqual(ev["content"]["x"], "y")
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def test_message_edit(self):
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"""Ensure that the module doesn't cause issues with edited messages."""
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# first patch the event checker so that it will modify the event
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async def check(ev: EventBase, state):
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d = ev.get_dict()
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d["content"] = {
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"msgtype": "m.text",
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"body": d["content"]["body"].upper(),
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}
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return d
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current_rules_module().check_event_allowed = check
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# Send an event, then edit it.
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channel = self.make_request(
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"PUT",
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"/_matrix/client/r0/rooms/%s/send/modifyme/1" % self.room_id,
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{
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"msgtype": "m.text",
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"body": "Original body",
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},
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access_token=self.tok,
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)
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self.assertEqual(channel.result["code"], b"200", channel.result)
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orig_event_id = channel.json_body["event_id"]
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channel = self.make_request(
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"PUT",
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"/_matrix/client/r0/rooms/%s/send/m.room.message/2" % self.room_id,
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{
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"m.new_content": {"msgtype": "m.text", "body": "Edited body"},
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"m.relates_to": {
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"rel_type": "m.replace",
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"event_id": orig_event_id,
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},
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"msgtype": "m.text",
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"body": "Edited body",
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},
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access_token=self.tok,
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)
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self.assertEqual(channel.result["code"], b"200", channel.result)
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edited_event_id = channel.json_body["event_id"]
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# ... and check that they both got modified
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channel = self.make_request(
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"GET",
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"/_matrix/client/r0/rooms/%s/event/%s" % (self.room_id, orig_event_id),
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access_token=self.tok,
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)
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self.assertEqual(channel.result["code"], b"200", channel.result)
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ev = channel.json_body
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self.assertEqual(ev["content"]["body"], "ORIGINAL BODY")
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channel = self.make_request(
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"GET",
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"/_matrix/client/r0/rooms/%s/event/%s" % (self.room_id, edited_event_id),
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access_token=self.tok,
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)
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self.assertEqual(channel.result["code"], b"200", channel.result)
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ev = channel.json_body
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self.assertEqual(ev["content"]["body"], "EDITED BODY")
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def test_send_event(self):
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"""Tests that the module can send an event into a room via the module api"""
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content = {
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"msgtype": "m.text",
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"body": "Hello!",
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}
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event_dict = {
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"room_id": self.room_id,
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"type": "m.room.message",
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"content": content,
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"sender": self.user_id,
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}
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event = self.get_success(
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current_rules_module().module_api.create_and_send_event_into_room(
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event_dict
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)
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) # type: EventBase
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self.assertEquals(event.sender, self.user_id)
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self.assertEquals(event.room_id, self.room_id)
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self.assertEquals(event.type, "m.room.message")
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self.assertEquals(event.content, content)
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