Function ruma_state_res::event_auth::auth_check

pub fn auth_check<E, F>(
    room_version: &RoomVersion, 
    incoming_event: &Arc<E>, 
    prev_event: Option<Arc<E>>, 
    current_third_party_invite: Option<Arc<E>>, 
    fetch_state: F
) -> Result<bool> where
    E: Event,
    F: Fn(&EventType, &str) -> Option<Arc<E>>, 

Authenticate the incoming event. The steps of authentication are:

• check that the event is being authenticated for the correct room
• check that the events signatures are valid
• then there are checks for specific event types

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.

Returns

This returns an Error only when serialization fails or some other fatal outcome.