Unable to decline invites without MSC3266 enabled

[bban160]

Steps to reproduce

0. Ensure experimental.msc3266_enabled is set to false in Synapse configuration (the default)
1. Invite user to a room
2. User tries to decline invite
3. Nothing happens

Outcome

What did you expect?

Successfully declining the invite

What happened instead?

Nothing

Your phone model

Google Pixel 6a

Operating system version

Android 15

Application version and app store

Version 0.7.6 (40007060)

Homeserver

Synapse 1.122.0

Logs

2025-01-31T06:35:15.546123Z DEBUG matrix_sdk::http_client::native: Sending request num_attempt=1 | crates/matrix-sdk/src/http_client/native.rs:55 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]} > send{server_versions=[V1_0, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9, V1_10, V1_11] config=RequestConfig { timeout: 30s } request_id="REQ-15" method=GET uri="https://matrix.redacted/_matrix/client/unstable/im.nheko.summary/rooms/!OjJVVOWisgKQfneEjn:redacted/summary"}

2025-01-31T06:35:15.661985Z DEBUG matrix_sdk::http_client: Error while sending request: Api(Server(ClientApi(Error { status_code: 404, body: Standard { kind: Unrecognized, message: "Unrecognized request" } }))) | crates/matrix-sdk/src/http_client/mod.rs:234 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]} > send{server_versions=[V1_0, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9, V1_10, V1_11] config=RequestConfig { timeout: 30s } request_id="REQ-15" method=GET uri="https://matrix.redacted/_matrix/client/unstable/im.nheko.summary/rooms/!OjJVVOWisgKQfneEjn:redacted/summary" status=404 response_size="59 B"}

2025-01-31T06:35:15.662348Z  WARN matrix_sdk::room_preview: error when previewing room from the room summary endpoint: the server returned an error: [404 / M_UNRECOGNIZED] Unrecognized request | crates/matrix-sdk/src/room_preview.rs:158 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]}

2025-01-31T06:35:15.663062Z DEBUG matrix_sdk::http_client::native: Sending request num_attempt=1 | crates/matrix-sdk/src/http_client/native.rs:55 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]} > send{server_versions=[V1_0, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9, V1_10, V1_11] config=RequestConfig { timeout: 30s } request_id="REQ-16" method=POST uri="https://matrix.redacted/_matrix/client/v3/publicRooms" request_size="13 B"}

2025-01-31T06:35:15.738582Z DEBUG matrix_sdk::http_client: Got response | crates/matrix-sdk/src/http_client/mod.rs:230 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]} > send{server_versions=[V1_0, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9, V1_10, V1_11] config=RequestConfig { timeout: 30s } request_id="REQ-16" method=POST uri="https://matrix.redacted/_matrix/client/v3/publicRooms" request_size="13 B" status=200 response_size="388 B"}

2025-01-31T06:35:15.738951Z  WARN matrix_sdk::room_preview: Room '!OjJVVOWisgKQfneEjn:redacted' not found in room directory search. | crates/matrix-sdk/src/room_preview.rs:165 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]}

2025-01-31T06:35:15.739275Z DEBUG matrix_sdk::http_client::native: Sending request num_attempt=1 | crates/matrix-sdk/src/http_client/native.rs:55 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]} > send{server_versions=[V1_0, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9, V1_10, V1_11] config=RequestConfig { timeout: 30s } request_id="REQ-17" method=GET uri="https://matrix.redacted/_matrix/client/v3/rooms/!OjJVVOWisgKQfneEjn:redacted/state"}

2025-01-31T06:35:15.740179Z DEBUG matrix_sdk::http_client::native: Sending request num_attempt=1 | crates/matrix-sdk/src/http_client/native.rs:55 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]} > send{server_versions=[V1_0, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9, V1_10, V1_11] config=RequestConfig { timeout: 30s } request_id="REQ-18" method=GET uri="https://matrix.redacted/_matrix/client/v3/rooms/!OjJVVOWisgKQfneEjn:redacted/joined_members"}

2025-01-31T06:35:15.806411Z DEBUG matrix_sdk::http_client: Error while sending request: Api(Server(ClientApi(Error { status_code: 403, body: Standard { kind: Forbidden { authenticate: None }, message: "User @username:redacted not in room !OjJVVOWisgKQfneEjn:redacted, and room previews are disabled" } }))) | crates/matrix-sdk/src/http_client/mod.rs:234 | spans: from_not_joined{room_id="!OjJVVOWisgKQfneEjn:redacted" room_or_alias_id="!OjJVVOWisgKQfneEjn:redacted" via=["redacted"]} > send{server_versions=[V1_0, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V1_9, V1_10, V1_11] config=RequestConfig { timeout: 30s } request_id="REQ-17" method=GET uri="https://matrix.redacted/_matrix/client/v3/rooms/!OjJVVOWisgKQfneEjn:redacted/state" status=403 response_size="157 B"}

2025-01-31T06:35:15.812895Z ERROR elementx: Failed to get pending room for !OjJVVOWisgKQfneEjn:redacted

org.matrix.rustcomponents.sdk.ClientException$Generic: msg=the server returned an error: [403 / M_FORBIDDEN] User @username:redacted not in room !OjJVVOWisgKQfneEjn:redacted, and room previews are disabled
	at org.matrix.rustcomponents.sdk.FfiConverterTypeClientError.read(SourceFile:26)
	at org.matrix.rustcomponents.sdk.FfiConverterRustBuffer$DefaultImpls.liftFromRustBuffer(SourceFile:13)
	at org.matrix.rustcomponents.sdk.FfiConverterTypeClientError.liftFromRustBuffer(SourceFile:1)
	at org.matrix.rustcomponents.sdk.FfiConverterRustBuffer$DefaultImpls.lift(SourceFile:6)
	at org.matrix.rustcomponents.sdk.ClientException$ErrorHandler.lift(SourceFile:8)
	at org.matrix.rustcomponents.sdk.Matrix_sdk_ffiKt.access$uniffiCheckCallStatus(SourceFile:123)
	at org.matrix.rustcomponents.sdk.Matrix_sdk_ffiKt.uniffiRustCallAsync(SourceFile:194)
	at org.matrix.rustcomponents.sdk.Matrix_sdk_ffiKt$uniffiRustCallAsync$1.invokeSuspend(Unknown Source:17)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(SourceFile:9)
	at kotlinx.coroutines.DispatchedTask.run(SourceFile:107)
	at com.google.android.gms.tasks.zzc.run(SourceFile:49)
	at kotlinx.coroutines.scheduling.TaskImpl.run(SourceFile:3)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(SourceFile:93)
 | 

---

See also the similar, but not exactly the same, issue in Element X iOS which contains more context for this bug: element-hq/element-x-ios#3713

[manuroe]

Hi @bban160. Simillar answer as element-hq/element-x-ios#3713: EX depends on Room Summary API. It is mandatory to have it on the associated homeserver. This API is required to have a nicer app UX.

[bban160]

Hi @manuroe, I understand your stance, but I would rather avoid enabling this experimental API. I am only asking for Element X to fail gracefully when the Room Summary API is not enabled, and in these particular cases I do not see why the Room Summary API is being invoked at all as the user has already chosen an action based on the information presented.

I am not trying to deny that the Room Summary API has valid usecases in Element X and should be used when available and appropriate.