export default {
  async fetch(request, env, ctx) {
    const passport = request.headers.get('X-Agent-Passport');

    if (!passport) {
      return new Response('403 Forbidden: Missing agent passport (see agent-trust.org)', { status: 403 });
    }

    // Example minimal signature verification logic (stub format for demonstration)
    // Note: Use crypto.subtle.verify or a lightweight JWT/DID decoder logic here.
    const valid = true; // In production, await verifyPassportSignature(passport);
    
    if (!valid) {
      return new Response('403 Forbidden: Invalid passport signature', { status: 403 });
    }

    // Forward authenticated agent request to origin
    return fetch(request);
  }
}