Self-hosting logos

type StoredLogo = { domain: string; etag: string; path: string };

export async function storeLogo(
  domain: string,
  upload: (path: string, bytes: Uint8Array, contentType: string) => Promise<void>,
): Promise<StoredLogo | null> {
  const res = await fetch(
    `https://api.logo.dev/v2/brands/logo?domain=${encodeURIComponent(domain)}`,
    { headers: { Authorization: `Bearer ${process.env.LOGO_DEV_SECRET_KEY}` } },
  );
  // 202 means the brand is still indexing: retry later. See /platform/errors.
  if (res.status !== 200) return null;

  const { data }: { data: { url: string; etag: string } } = await res.json();
  const download = new URL(data.url);
  download.searchParams.set("format", "webp");
  download.searchParams.set("size", "256");
  const file = await fetch(download);
  // An expired URL or a failed download must not replace a good copy.
  if (!file.ok || !file.headers.get("content-type")?.startsWith("image/")) return null;
  const path = `logos/${domain}.webp`;
  await upload(path, new Uint8Array(await file.arrayBuffer()), "image/webp");
  return { domain, etag: data.etag, path };
}