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Gaëtan
d8b4ffdf2d
Fixes: #19689 # What This PR fixes a bug I found when I run synapse (from dockerhub) and register a `check_event_allowed` callback and my client makes use of the mentions field in messages (`cinny:latest`). The bug doesn't appear when the `check_event_allowed` callback is not loaded. After some digging I noticed that the current validation of the mentions doesn't work when an event has been frozen with `event.freeze()`. For the messages this seems to happen when a the `check_event_allowed` is registered (but not otherwise), see [where the event is frozen for check_event_allowed callback](https://github.com/element-hq/synapse/blob/b0fc0b7a612a42e6f15b87dee2a1db4c383645fb/synapse/module_api/callbacks/third_party_event_rules_callbacks.py#L289) and [where the validation function is called](https://github.com/element-hq/synapse/blob/b0fc0b7a612a42e6f15b87dee2a1db4c383645fb/synapse/handlers/message.py#L1404). To have a minimal reproduction example, the following scripts fails on `develop` but succeeds in this branch: ``` python from synapse.api.room_versions import RoomVersions from synapse.events import EventBase, make_event_from_dict from synapse.events.validator import EventValidator from tests.utils import default_config def make_message_event(content: dict) -> EventBase: return make_event_from_dict( { "room_id": "!room:test", "type": "m.room.message", "sender": "@alice:test", "content": content, "auth_events": [], "prev_events": [], "hashes": {"sha256": "aGVsbG8="}, "signatures": {}, "depth": 1, "origin_server_ts": 1000, }, room_version=RoomVersions.V9, ) event = make_message_event( { "msgtype": "m.text", "body": "@moderator:example.com hello", "m.mentions": {"user_ids": ["@moderator:jailbreak-challenge.aqtiveguard.com"]}, } ) EventValidator().validate_new(event, default_config) # Ok event.freeze() EventValidator().validate_new(event, default_config) # throws # pydantic_core._pydantic_core.ValidationError: 1 validation error for Mentions # Input should be a valid dictionary or instance of Mentions [type=model_type, input_value=immutabledict({'user_ids'...nge.aqtiveguard.com',)}), input_type=immutabledict] # For further information visit https://errors.pydantic.dev/2.12/v/model_type ``` # How I made the validation logic also validate the transformation performed by the freezing process, namely: - `immutabledict` validates as `dict`. (was already implemented for POWER_LEVELS) - `tuple` validates as array (added this to the validator in this PR). --------- Co-authored-by: Eric Eastwood <madlittlemods@gmail.com> Co-authored-by: Olivier 'reivilibre <oliverw@matrix.org>