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

did-webs typescript library

import { createAid } from '../../core/Aid.js';
import { sortKeyEventStream } from './sortKeyEventStream.js';
import { getKeyState } from './getKeyState.js';
export const getDelegatorForDelegate = (delegate, events) => {
    // start with the event stream for the delegate
    const sortedEvents = sortKeyEventStream(events);
    const delegateEvents = sortedEvents.get(delegate);
    if (!delegateEvents || delegateEvents.length === 0) {
        throw new Error(`No events found for identifier: ${delegate}`);
    }
    // To find the delegator, filter events to only include 'dip' events
    // There might not be one, so we return undefined
    const validEvents = delegateEvents.filter((event) => event.t === 'dip');
    if (validEvents.length === 0)
        return undefined;
    // Since sortedEvents are in descending order, the first valid event is the current key state
    const latestEvent = validEvents[0];
    const delegatorAid = createAid(latestEvent.di); // if it's a 'dip' event, the 'di' field will be there
    // Get the latest key state for the delegator AID
    const delegatorIdentifierAndKeyState = getKeyState(delegatorAid, sortedEvents);
    if (!delegatorIdentifierAndKeyState) {
        throw new Error(`No key state found for delegator AID: ${delegatorAid}`);
    }
    return delegatorIdentifierAndKeyState;
};