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Stop applying edits to event contents (MSC3925). (#15193)

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Enables MSC3925 support by default, which:

* Includes the full edit event in the bundled aggregations of an
  edited event.
* Stops modifying the original event's content to return the new
  content from the edit event.

This is a backwards-incompatible change that is considered to be
"correct" by the spec.
This commit is contained in:
Patrick Cloke 2023-03-06 09:43:01 -05:00 committed by GitHub
parent fd9cadcf53
commit 05e0a4089a
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6 changed files with 15 additions and 109 deletions
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1
changelog.d/15193.bugfix Normal file
View file

@ -0,0 +1 @@
Stop applying edits when bundling aggregations, per [MSC3925](https://github.com/matrix-org/matrix-spec-proposals/pull/3925).

3
synapse/config/experimental.py
View file

@ -166,9 +166,6 @@ class ExperimentalConfig(Config):
# MSC3391: Removing account data.
self.msc3391_enabled = experimental.get("msc3391_enabled", False)
# MSC3925: do not replace events with their edits
self.msc3925_inhibit_edit = experimental.get("msc3925_inhibit_edit", False)
# MSC3873: Disambiguate event_match keys.
self.msc3873_escape_event_match_key = experimental.get(
"msc3873_escape_event_match_key", False

57
synapse/events/utils.py
View file

@ -39,7 +39,6 @@ from synapse.api.constants import (
from synapse.api.errors import Codes, SynapseError
from synapse.api.room_versions import RoomVersion
from synapse.types import JsonDict
from synapse.util.frozenutils import unfreeze
from . import EventBase
@ -403,14 +402,6 @@ class EventClientSerializer:
clients.
"""
def __init__(self, inhibit_replacement_via_edits: bool = False):
"""
Args:
inhibit_replacement_via_edits: If this is set to True, then events are
never replaced by their edits.
"""
self._inhibit_replacement_via_edits = inhibit_replacement_via_edits
def serialize_event(
self,
event: Union[JsonDict, EventBase],
@ -418,7 +409,6 @@ class EventClientSerializer:
*,
config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
bundle_aggregations: Optional[Dict[str, "BundledAggregations"]] = None,
apply_edits: bool = True,
) -> JsonDict:
"""Serializes a single event.
@ -428,10 +418,7 @@ class EventClientSerializer:
config: Event serialization config
bundle_aggregations: A map from event_id to the aggregations to be bundled
into the event.
apply_edits: Whether the content of the event should be modified to reflect
any replacement in `bundle_aggregations[<event_id>].replace`.
See also the `inhibit_replacement_via_edits` constructor arg: if that is
set to True, then this argument is ignored.
Returns:
The serialized event
"""
@ -450,38 +437,10 @@ class EventClientSerializer:
config,
bundle_aggregations,
serialized_event,
apply_edits=apply_edits,
)
return serialized_event
def _apply_edit(
self, orig_event: EventBase, serialized_event: JsonDict, edit: EventBase
) -> None:
"""Replace the content, preserving existing relations of the serialized event.
Args:
orig_event: The original event.
serialized_event: The original event, serialized. This is modified.
edit: The event which edits the above.
"""
# Ensure we take copies of the edit content, otherwise we risk modifying
# the original event.
edit_content = edit.content.copy()
# Unfreeze the event content if necessary, so that we may modify it below
edit_content = unfreeze(edit_content)
serialized_event["content"] = edit_content.get("m.new_content", {})
# Check for existing relations
relates_to = orig_event.content.get("m.relates_to")
if relates_to:
# Keep the relations, ensuring we use a dict copy of the original
serialized_event["content"]["m.relates_to"] = relates_to.copy()
else:
serialized_event["content"].pop("m.relates_to", None)
def _inject_bundled_aggregations(
self,
event: EventBase,
@ -489,7 +448,6 @@ class EventClientSerializer:
config: SerializeEventConfig,
bundled_aggregations: Dict[str, "BundledAggregations"],
serialized_event: JsonDict,
apply_edits: bool,
) -> None:
"""Potentially injects bundled aggregations into the unsigned portion of the serialized event.
@ -504,9 +462,6 @@ class EventClientSerializer:
While serializing the bundled aggregations this map may be searched
again for additional events in a recursive manner.
serialized_event: The serialized event which may be modified.
apply_edits: Whether the content of the event should be modified to reflect
any replacement in `aggregations.replace` (subject to the
`inhibit_replacement_via_edits` constructor arg).
"""
# We have already checked that aggregations exist for this event.
@ -522,11 +477,6 @@ class EventClientSerializer:
] = event_aggregations.references
if event_aggregations.replace:
# If there is an edit, optionally apply it to the event.
edit = event_aggregations.replace
if apply_edits and not self._inhibit_replacement_via_edits:
self._apply_edit(event, serialized_event, edit)
# Include information about it in the relations dict.
#
# Matrix spec v1.5 (https://spec.matrix.org/v1.5/client-server-api/#server-side-aggregation-of-mreplace-relationships)
@ -534,10 +484,7 @@ class EventClientSerializer:
# `sender` of the edit; however MSC3925 proposes extending it to the whole
# of the edit, which is what we do here.
serialized_aggregations[RelationTypes.REPLACE] = self.serialize_event(
edit,
time_now,
config=config,
apply_edits=False,
event_aggregations.replace, time_now, config=config
)
# Include any threaded replies to this event.

2
synapse/rest/client/room.py
View file

@ -818,7 +818,7 @@ class RoomEventServlet(RestServlet):
# per MSC2676, /rooms/{roomId}/event/{eventId}, should return the
# *original* event, rather than the edited version
event_dict = self._event_serializer.serialize_event(
event, time_now, bundle_aggregations=aggregations, apply_edits=False
event, time_now, bundle_aggregations=aggregations
)
return 200, event_dict

2
synapse/server.py
View file

@ -743,7 +743,7 @@ class HomeServer(metaclass=abc.ABCMeta):
@cache_in_self
def get_event_client_serializer(self) -> EventClientSerializer:
return EventClientSerializer(self.config.experimental.msc3925_inhibit_edit)
return EventClientSerializer()
@cache_in_self
def get_password_policy_handler(self) -> PasswordPolicyHandler:

59
tests/rest/client/test_relations.py
View file

@ -30,7 +30,6 @@ from tests import unittest
from tests.server import FakeChannel
from tests.test_utils import make_awaitable
from tests.test_utils.event_injection import inject_event
from tests.unittest import override_config
class BaseRelationsTestCase(unittest.HomeserverTestCase):
@ -403,7 +402,7 @@ class RelationsTestCase(BaseRelationsTestCase):
def test_edit(self) -> None:
"""Test that a simple edit works."""
orig_body = {"body": "Hi!", "msgtype": "m.text"}
new_body = {"msgtype": "m.text", "body": "I've been edited!"}
edit_event_content = {
"msgtype": "m.text",
@ -424,9 +423,7 @@ class RelationsTestCase(BaseRelationsTestCase):
access_token=self.user_token,
)
self.assertEqual(200, channel.code, channel.json_body)
self.assertEqual(
channel.json_body["content"], {"body": "Hi!", "msgtype": "m.text"}
)
self.assertEqual(channel.json_body["content"], orig_body)
self._assert_edit_bundle(channel.json_body, edit_event_id, edit_event_content)
# Request the room messages.
@ -443,7 +440,7 @@ class RelationsTestCase(BaseRelationsTestCase):
)
# Request the room context.
# /context should return the edited event.
# /context should return the event.
channel = self.make_request(
"GET",
f"/rooms/{self.room}/context/{self.parent_id}",
@ -453,7 +450,7 @@ class RelationsTestCase(BaseRelationsTestCase):
self._assert_edit_bundle(
channel.json_body["event"], edit_event_id, edit_event_content
)
self.assertEqual(channel.json_body["event"]["content"], new_body)
self.assertEqual(channel.json_body["event"]["content"], orig_body)
# Request sync, but limit the timeline so it becomes limited (and includes
# bundled aggregations).
@ -491,45 +488,11 @@ class RelationsTestCase(BaseRelationsTestCase):
edit_event_content,
)
@override_config({"experimental_features": {"msc3925_inhibit_edit": True}})
def test_edit_inhibit_replace(self) -> None:
"""
If msc3925_inhibit_edit is enabled, then the original event should not be
replaced.
"""
new_body = {"msgtype": "m.text", "body": "I've been edited!"}
edit_event_content = {
"msgtype": "m.text",
"body": "foo",
"m.new_content": new_body,
}
channel = self._send_relation(
RelationTypes.REPLACE,
"m.room.message",
content=edit_event_content,
)
edit_event_id = channel.json_body["event_id"]
# /context should return the *original* event.
channel = self.make_request(
"GET",
f"/rooms/{self.room}/context/{self.parent_id}",
access_token=self.user_token,
)
self.assertEqual(200, channel.code, channel.json_body)
self.assertEqual(
channel.json_body["event"]["content"], {"body": "Hi!", "msgtype": "m.text"}
)
self._assert_edit_bundle(
channel.json_body["event"], edit_event_id, edit_event_content
)
def test_multi_edit(self) -> None:
"""Test that multiple edits, including attempts by people who
shouldn't be allowed, are correctly handled.
"""
orig_body = orig_body = {"body": "Hi!", "msgtype": "m.text"}
self._send_relation(
RelationTypes.REPLACE,
"m.room.message",
@ -570,7 +533,7 @@ class RelationsTestCase(BaseRelationsTestCase):
)
self.assertEqual(200, channel.code, channel.json_body)
self.assertEqual(channel.json_body["event"]["content"], new_body)
self.assertEqual(channel.json_body["event"]["content"], orig_body)
self._assert_edit_bundle(
channel.json_body["event"], edit_event_id, edit_event_content
)
@ -642,6 +605,7 @@ class RelationsTestCase(BaseRelationsTestCase):
def test_edit_edit(self) -> None:
"""Test that an edit cannot be edited."""
orig_body = {"body": "Hi!", "msgtype": "m.text"}
new_body = {"msgtype": "m.text", "body": "Initial edit"}
edit_event_content = {
"msgtype": "m.text",
@ -675,14 +639,12 @@ class RelationsTestCase(BaseRelationsTestCase):
access_token=self.user_token,
)
self.assertEqual(200, channel.code, channel.json_body)
self.assertEqual(
channel.json_body["content"], {"body": "Hi!", "msgtype": "m.text"}
)
self.assertEqual(channel.json_body["content"], orig_body)
# The relations information should not include the edit to the edit.
self._assert_edit_bundle(channel.json_body, edit_event_id, edit_event_content)
# /context should return the event updated for the *first* edit
# /context should return the bundled edit for the *first* edit
# (The edit to the edit should be ignored.)
channel = self.make_request(
"GET",
@ -690,7 +652,7 @@ class RelationsTestCase(BaseRelationsTestCase):
access_token=self.user_token,
)
self.assertEqual(200, channel.code, channel.json_body)
self.assertEqual(channel.json_body["event"]["content"], new_body)
self.assertEqual(channel.json_body["event"]["content"], orig_body)
self._assert_edit_bundle(
channel.json_body["event"], edit_event_id, edit_event_content
)
@ -1287,7 +1249,6 @@ class BundledAggregationsTestCase(BaseRelationsTestCase):
thread_summary = relations_dict[RelationTypes.THREAD]
self.assertIn("latest_event", thread_summary)
latest_event_in_thread = thread_summary["latest_event"]
self.assertEqual(latest_event_in_thread["content"]["body"], "I've been edited!")
# The latest event in the thread should have the edit appear under the
# bundled aggregations.
self.assertDictContainsSubset(