Authentication against Nostr Relay

nostr-doauth.js

import { kinds, SimplePool } from 'nostr-tools';
import { makeAuthEvent } from 'nostr-tools/nip42';
import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure'

let sk = generateSecretKey();
let pk = getPublicKey(sk);

const relayUrls = ['wss://inbox.relays.land/', 'wss://lockbox.fiatjaf.com/'];

let userPool = new SimplePool();
let pubkey = '3bf0c63fcb93463407af97a5e5ee64fa883d107ef9e558472c4eb9aaaefa459d';

userPool.subscribeEose(relayUrls, {
    kinds: [kinds.Metadata],
    authors: [pubkey],
}, {
    onevent: (evt) => {
        console.log('Received event on the account subscription:', evt);
    },
    onclose: (reasons) => {
        console.log('Closed user pool', { reasons });
    },
    doauth: async (event) => {
        console.log('Received doauth event', { event });

        const challenge = event.tags.find(t => t[0] === 'challenge')?.[1] || '';
        const relay = event.tags.find(t => t[0] === 'relay')?.[1];

        const unsignedEvent = makeAuthEvent(relay, challenge);
        const signedEvent = finalizeEvent(unsignedEvent, sk);

        console.log('Signed event:', { signedEvent });
        return signedEvent;
    }
});