nostr-web-components/lib/hints.js

collection of web components that provide quick access to basic nostr things

import LRUCache from "mnemonist/lru-cache";
import { SimplePool } from "nostr-tools";
import { normalizeURL } from "nostr-tools/utils";
const pool = window.nostrSharedPool || new SimplePool();
const relayListsCache = window.nostrMetadataCache || new LRUCache(1e3);
const fallbackRelays = [
  "wss://relay.nostr.band",
  "wss://relay.damus.io",
  "wss://relay.primal.net",
  "wss://nos.lol",
  "wss://cache2.primal.net/v1",
  "wss://relay.nostr.bg"
].map(normalizeURL);
function getOutboxRelaysFor(pubkey) {
  let rl = relayListsCache.get(pubkey);
  if (rl)
    return rl;
  let promise = new Promise(
    (resolve) => pool.subscribeManyEose(
      ["wss://purplepag.es", "wss://user.kindpag.es", "wss://relay.nos.social"],
      [
        {
          kinds: [10002],
          authors: [pubkey]
        }
      ],
      {
        onevent(evt) {
          try {
            resolve(
              evt.tags.filter((tag) => tag[0] === "r" && (tag[2] === void 0 || tag[2] === "write")).map((tag) => normalizeURL(tag[1]))
            );
          } catch (err) {
          }
        },
        onclose() {
          resolve([]);
        }
      }
    )
  );
  relayListsCache.set(pubkey, promise);
  return promise;
}
function appendFallback(relays) {
  let next = fallbackRelays[Math.floor(Math.random() * fallbackRelays.length)];
  if (relays.includes(next))
    return;
  relays.push(next);
}
export {
  appendFallback,
  getOutboxRelaysFor
};