interface Env {}

export const onRequest: PagesFunction<Env> = async context => {
  const id = context.params.id as string | undefined;

  const prefixes = ["npub1", "nprofile1", "naddr1", "nevent1", "note1"];
  const next = await context.next();
  if (id && prefixes.some(a => id.startsWith(a))) {
    try {
      const rsp = await fetch(
        `http://nostr.api.v0l.io/api/v1/opengraph/${id}?canonical=${encodeURIComponent("https://zap.stream/%s")}`,
        {
          method: "POST",
          body: await next.arrayBuffer(),
          headers: {
            "user-agent": "zap.stream/1.0 (https://zap.stream)",
            "content-type": "text/html",
            accept: "text/html",
          },
        }
      );
      if (rsp.ok) {
        const body = await rsp.text();
        if (body.length > 0) {
          return new Response(body, {
            headers: {
              "content-type": "text/html",
            },
          });
        }
      }
    } catch {
      // ignore
    }
  }
  return next;
};