Minimal Edge KV URL Shortener

// 1. In Cloudflare Dashboard -> msstore-worker -> Settings -> Variables -> KV Bindings:
//    Bind your link KV as: env.LINK_KV

// 2. Add this block to your worker's fetch(request, env) handler:
if (request.method === "POST" && url.pathname === "/api/shorten") {
  const { url: dest, slug, ttl } = await request.json();
  const kvOpts = ttl ? { expirationTtl: Number(ttl) } : {};
  await env.LINK_KV.put(`url:${slug}`, JSON.stringify({
    destination: dest, createdAt: Date.now(), lastAccessed: Date.now(), clicks: 0
  }), kvOpts);
  return new Response(JSON.stringify({ success: true, slug, shortUrl: `${url.origin}/s/${slug}` }), {
    headers: { "Content-Type": "application/json", "Access-Control-Allow-Origin": "*" }
  });
}

if (request.method === "GET" && url.pathname.startsWith("/s/")) {
  const slug = url.pathname.replace("/s/", "").trim();
  const raw = await env.LINK_KV.get(`url:${slug}`);
  if (!raw) return new Response("Link expired or not found", { status: 404 });
  const data = JSON.parse(raw);
  data.clicks = (data.clicks || 0) + 1;
  data.lastAccessed = Date.now();
  await env.LINK_KV.put(`url:${slug}`, JSON.stringify(data), { expirationTtl: 1728000 }); // renews 20-day TTL!
  return Response.redirect(data.destination, 302);
}