Function auth_check

pub fn auth_check<E>(
    rules: &AuthorizationRules,
    incoming_event: impl Event,
    fetch_state: impl Fn(&StateEventType, &str) -> Option<E>,
) -> Result<(), String>
where
    E: Event,

Available on crate feature state-res only.

Check whether the incoming event passes the authorization rules for the given room version.

The fetch_state closure should gather state from a state snapshot. We need to know if the event passes auth against some state not a recursive collection of auth_events fields.

This assumes that ruma_signatures::verify_event() was called previously, as some authorization rules depend on the signatures being valid on the event.

Errors

If the check fails, this returns an Err(_) with a description of the check that failed.