Cognito's pre-token v2 hook can sometimes receive a null groupConfiguration field value. The cognito documentation includes example JSON rather than schema, so it's not clear whether this is a cognito bug or not. But it definitely happens at runtime for some user pools.
In any case, the rust structure fails to deserialize the event with
PreTokenGenerationV2_0 failed with error failed to deserialize the incoming data into the function's payload type: [request.groupConfiguration] request.groupConfiguration: invalid type: null, expected struct GroupConfiguration at line 1 column 835
In any case, the obvious backwards-compatible fix is to add #[serde(default)] to the field. Looks like maybe that was the intent and it just got missed on that field? Happy to test the fix / send a PR.
Cognito's pre-token v2 hook can sometimes receive a null groupConfiguration field value. The cognito documentation includes example JSON rather than schema, so it's not clear whether this is a cognito bug or not. But it definitely happens at runtime for some user pools.
In any case, the rust structure fails to deserialize the event with
In any case, the obvious backwards-compatible fix is to add
#[serde(default)]to the field. Looks like maybe that was the intent and it just got missed on that field? Happy to test the fix / send a PR.