synapse/changelog.d/12683.bugfix
Eric Eastwood 84facf769e
Fix /messages throwing a 500 when querying for non-existent room (#12683)
Fix https://github.com/matrix-org/synapse/issues/12678

Complement test added:  https://github.com/matrix-org/complement/pull/369

**Before:** 500 internal server error

**After:** According to the [spec](https://spec.matrix.org/latest/client-server-api/#get_matrixclientv3roomsroomidmessages), calling `/messages` against a non-existent `room_id` should throw a 403 forbidden (since you're not part of the room). This also matches the behavior before https://github.com/matrix-org/synapse/pull/12370 which regressed Synapse to the 500 behavior.
```json
{
    "errcode": "M_FORBIDDEN",
    "error": "User @test:my.synapse.server not in room !dne:my.synapse.server, and room previews are disabled"
}
```
2022-05-10 23:39:14 -05:00

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Fix a bug introduced in Synapse 1.57.0 where `/messages` would throw a 500 error when querying for a non-existent room.