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Implement MSC2175: remove the creator field from create events. (#15394)

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Patrick Cloke 2023-04-06 16:26:28 -04:00 committed by GitHub
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8 changed files with 72 additions and 24 deletions
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1
changelog.d/15394.misc Normal file
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@ -0,0 +1 @@
Implement [MSC2175](https://github.com/matrix-org/matrix-doc/pull/2175) to stop adding `creator` to create events.

2
synapse/api/constants.py
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@ -215,6 +215,8 @@ class EventContentFields:
FEDERATE: Final = "m.federate"
# The creator of the room, as used in `m.room.create` events.
#
# This is deprecated in MSC2175.
ROOM_CREATOR: Final = "creator"
# Used in m.room.guest_access events.

17
synapse/api/room_versions.py
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@ -78,6 +78,8 @@ class RoomVersion:
# MSC2209: Check 'notifications' key while verifying
# m.room.power_levels auth rules.
limit_notifications_power_levels: bool
# MSC2175: No longer include the creator in m.room.create events.
msc2175_implicit_room_creator: bool
# MSC2174/MSC2176: Apply updated redaction rules algorithm.
msc2176_redaction_rules: bool
# MSC3083: Support the 'restricted' join_rule.
@ -118,6 +120,7 @@ class RoomVersions:
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -138,6 +141,7 @@ class RoomVersions:
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -158,6 +162,7 @@ class RoomVersions:
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -178,6 +183,7 @@ class RoomVersions:
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -198,6 +204,7 @@ class RoomVersions:
special_case_aliases_auth=True,
strict_canonicaljson=False,
limit_notifications_power_levels=False,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -218,6 +225,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -238,6 +246,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=True,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -258,6 +267,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -278,6 +288,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=True,
msc3375_redaction_rules=False,
@ -298,6 +309,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=True,
msc3375_redaction_rules=True,
@ -318,6 +330,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=True,
msc3375_redaction_rules=True,
@ -338,6 +351,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=True,
msc3375_redaction_rules=True,
@ -358,6 +372,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=False,
msc3375_redaction_rules=False,
@ -379,6 +394,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=True,
msc3375_redaction_rules=True,
@ -399,6 +415,7 @@ class RoomVersions:
special_case_aliases_auth=False,
strict_canonicaljson=True,
limit_notifications_power_levels=True,
msc2175_implicit_room_creator=False,
msc2176_redaction_rules=False,
msc3083_join_rules=True,
msc3375_redaction_rules=True,

25
synapse/event_auth.py
View file

@ -455,8 +455,11 @@ def _check_create(event: "EventBase") -> None:
"room appears to have unsupported version %s" % (room_version_prop,),
)
# 1.4 If content has no creator field, reject.
if EventContentFields.ROOM_CREATOR not in event.content:
# 1.4 If content has no creator field, reject if the room version requires it.
if (
not event.room_version.msc2175_implicit_room_creator
and EventContentFields.ROOM_CREATOR not in event.content
):
raise AuthError(403, "Create event lacks a 'creator' property")
@ -491,7 +494,11 @@ def _is_membership_change_allowed(
key = (EventTypes.Create, "")
create = auth_events.get(key)
if create and event.prev_event_ids()[0] == create.event_id:
if create.content["creator"] == event.state_key:
if room_version.msc2175_implicit_room_creator:
creator = create.sender
else:
creator = create.content[EventContentFields.ROOM_CREATOR]
if creator == event.state_key:
return
target_user_id = event.state_key
@ -1004,10 +1011,14 @@ def get_user_power_level(user_id: str, auth_events: StateMap["EventBase"]) -> in
# that.
key = (EventTypes.Create, "")
create_event = auth_events.get(key)
if create_event is not None and create_event.content["creator"] == user_id:
return 100
else:
return 0
if create_event is not None:
if create_event.room_version.msc2175_implicit_room_creator:
creator = create_event.sender
else:
creator = create_event.content[EventContentFields.ROOM_CREATOR]
if creator == user_id:
return 100
return 0
def get_named_level(auth_events: StateMap["EventBase"], name: str, default: int) -> int:

5
synapse/handlers/federation_event.py
View file

@ -1515,7 +1515,10 @@ class FederationEventHandler:
# support it or the event is not from the room creator.
room_version = await self._store.get_room_version(marker_event.room_id)
create_event = await self._store.get_create_event_for_room(marker_event.room_id)
room_creator = create_event.content.get(EventContentFields.ROOM_CREATOR)
if not room_version.msc2175_implicit_room_creator:
room_creator = create_event.content.get(EventContentFields.ROOM_CREATOR)
else:
room_creator = create_event.sender
if not room_version.msc2716_historical and (
not self._config.experimental.msc2716_enabled
or marker_event.sender != room_creator

7
synapse/handlers/message.py
View file

@ -1909,7 +1909,12 @@ class EventCreationHandler:
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
create_event = await self.store.get_create_event_for_room(event.room_id)
room_creator = create_event.content.get(EventContentFields.ROOM_CREATOR)
if not room_version_obj.msc2175_implicit_room_creator:
room_creator = create_event.content.get(
EventContentFields.ROOM_CREATOR
)
else:
room_creator = create_event.sender
# Only check an insertion event if the room version
# supports it or the event is from the room creator.

22
synapse/handlers/room.py
View file

@ -567,6 +567,7 @@ class RoomCreationHandler:
await self._send_events_for_new_room(
requester,
new_room_id,
new_room_version,
# we expect to override all the presets with initial_state, so this is
# somewhat arbitrary.
room_config={"preset": RoomCreationPreset.PRIVATE_CHAT},
@ -922,6 +923,7 @@ class RoomCreationHandler:
) = await self._send_events_for_new_room(
requester,
room_id,
room_version,
room_config=config,
invite_list=invite_list,
initial_state=initial_state,
@ -998,6 +1000,7 @@ class RoomCreationHandler:
self,
creator: Requester,
room_id: str,
room_version: RoomVersion,
room_config: JsonDict,
invite_list: List[str],
initial_state: MutableStateMap,
@ -1020,6 +1023,8 @@ class RoomCreationHandler:
the user requesting the room creation
room_id:
room id for the room being created
room_version:
The room version of the new room.
room_config:
A dict of configuration options. This will be the body of
a /createRoom request; see
@ -1053,14 +1058,6 @@ class RoomCreationHandler:
# (as this info can't be pulled from the db)
state_map: MutableStateMap[str] = {}
def create_event_dict(etype: str, content: JsonDict, **kwargs: Any) -> JsonDict:
e = {"type": etype, "content": content}
e.update(event_keys)
e.update(kwargs)
return e
async def create_event(
etype: str,
content: JsonDict,
@ -1083,7 +1080,10 @@ class RoomCreationHandler:
nonlocal depth
nonlocal prev_event
event_dict = create_event_dict(etype, content, **kwargs)
# Create the event dictionary.
event_dict = {"type": etype, "content": content}
event_dict.update(event_keys)
event_dict.update(kwargs)
(
new_event,
@ -1120,7 +1120,9 @@ class RoomCreationHandler:
400, f"'{preset_config}' is not a valid preset", errcode=Codes.BAD_JSON
)
creation_content.update({"creator": creator_id})
# MSC2175 removes the creator field from the create event.
if not room_version.msc2175_implicit_room_creator:
creation_content["creator"] = creator_id
creation_event, unpersisted_creation_context = await create_event(
EventTypes.Create, creation_content, False
)

17
synapse/storage/databases/main/room.py
View file

@ -1998,6 +1998,9 @@ class RoomBackgroundUpdateStore(SQLBaseStore):
for room_id, event_json in room_id_to_create_event_results:
event_dict = db_to_json(event_json)
# The creator property might not exist in newer room versions, but
# for those versions the creator column should be properly populate
# during room creation.
creator = event_dict.get("content").get(EventContentFields.ROOM_CREATOR)
self.db_pool.simple_update_txn(
@ -2132,12 +2135,16 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore):
# invalid, and it would fail auth checks anyway.
raise StoreError(400, "No create event in state")
room_creator = create_event.content.get(EventContentFields.ROOM_CREATOR)
# Before MSC2175, the room creator was a separate field.
if not room_version.msc2175_implicit_room_creator:
room_creator = create_event.content.get(EventContentFields.ROOM_CREATOR)
if not isinstance(room_creator, str):
# If the create event does not have a creator then the room is
# invalid, and it would fail auth checks anyway.
raise StoreError(400, "No creator defined on the create event")
if not isinstance(room_creator, str):
# If the create event does not have a creator then the room is
# invalid, and it would fail auth checks anyway.
raise StoreError(400, "No creator defined on the create event")
else:
room_creator = create_event.sender
await self.db_pool.simple_upsert(
desc="upsert_room_on_join",