Wallet labels

const API = "https://api.fomoscan.sh";
const headers = { Authorization: `Bearer ${process.env.FOMOSCAN_KEY}` };
const cache = new Map();
const HIT_TTL = 24 * 60 * 60_000;
const MISS_TTL = 60 * 60_000;

export async function labelFor(address) {
  const cached = cache.get(address);
  if (cached && cached.expires > Date.now()) return cached.label;

  const res = await fetch(`${API}/v2/user/wallet/${address}`, { headers });
  let label = null;
  if (res.ok) {
    const user = await res.json();
    label = {
      id: user.id,
      handle: user.handle,
      name: user.name,
      avatar: user.profilePicture,
      twitter: user.twitter,
    };
  } else if (res.status !== 404) {
    throw new Error(`FomoScan ${res.status}`);
  }

  cache.set(address, { label, expires: Date.now() + (label ? HIT_TTL : MISS_TTL) });
  return label;
}