//! Types for the *m.dummy* event.

use std::collections::HashMap;

use serde::{Deserialize, Serialize};

event! {
    /// This event type is used to indicate new Olm sessions for end-to-end encryption.
    ///
    /// Typically it is encrypted as an *m.room.encrypted* event, then sent as a to-device event.
    ///
    /// The event does not have any content associated with it. The sending client is expected to
    /// send a key share request shortly after this message, causing the receiving client to process
    /// this *m.dummy* event as the most recent event and using the keyshare request to set up the
    /// session. The keyshare request and *m.dummy* combination should result in the original
    /// sending client receiving keys over the newly established session.
    pub struct DummyEvent(DummyEventContent) {}
}

/// The payload of an *m.dummy* event.
///
/// The values in the hash map are not meaningful. They are used to generate an empty JSON
/// object to support the structure used by the Matrix specification.
pub type DummyEventContent = HashMap<(), ()>;