@gleif-it/did-webs-ts/dist/esm/utils/cesr/getKeyState.js

did-webs typescript library

// Returns the latest key state for a given identifier from the sorted key event stream
export const getKeyState = (identifier, events) => {
    const sortedEvents = events.get(identifier);
    if (!sortedEvents || sortedEvents.length === 0) {
        throw new Error(`No events found for identifier: ${identifier}`);
    }
    // To find latest key state, filter events to only include inception or rotation events
    const validEvents = sortedEvents.filter((event) => event.t === 'icp' || event.t === 'rot');
    if (validEvents.length === 0) {
        throw new Error(`No inception or rotation events found for identifier: ${identifier}`);
    }
    // Since sortedEvents are in descending order, the first valid event is the current key state
    const latestEvent = validEvents[0];
    return {
        identifier,
        keyState: { kt: latestEvent.kt, k: latestEvent.k },
    };
};