Feat: Use newsletter.planetrenox.com for sub/unsub (lynchmark pool)

Subscribe form now posts to newsletter.planetrenox.com/api/sub with a
Turnstile token; unsubscribe posts to /api/unsub. Drops the old Resend
Pages functions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

blog/lynchmark-newsletter-experiment.html

@@ -36,6 +36,7 @@
         <form id="sub-form" class="space-y-4 pt-4 border-t border-gray-100">
           <input type="email" id="email" required placeholder="you@example.com" class="w-full px-4 py-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500 outline-none mono text-sm">
           <button type="submit" class="w-full px-6 py-3 bg-blue-600 text-white font-medium rounded-lg hover:bg-blue-700 transition">Subscribe</button>
+          <div class="cf-turnstile" data-sitekey="0x4AAAAAAFG4HWETOcDDQ5vg" data-appearance="interaction-only" data-size="flexible"></div>
         </form>
         <p id="msg" class="text-center text-sm hidden"></p>
       </div>
@@ -43,19 +44,23 @@
     <footer class="mt-12 text-center text-xs text-gray-500 mono">Public Domain</footer>
   </main>
   <script>
-    const form=document.getElementById('sub-form'),msg=document.getElementById('msg');
+    const form=document.getElementById('sub-form'),msg=document.getElementById('msg'),
+      token=()=>form.querySelector('[name=cf-turnstile-response]')?.value;
     form.onsubmit=async e=>{
       e.preventDefault();
       msg.className='text-center text-sm text-gray-500';
       msg.textContent='Subscribing...';
       msg.classList.remove('hidden');
+      for(let i=0;i<50&&!token();i++)await new Promise(r=>setTimeout(r,100));
       try{
-        const r=await fetch('/api/subscribe',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({email:document.getElementById('email').value})});
+        const r=await fetch('https://newsletter.planetrenox.com/api/sub',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({pool:'lynchmark',email:document.getElementById('email').value,token:token()||''})});
         const d=await r.json();
         if(d.ok){msg.textContent='✓ Subscribed!';msg.className='text-center text-sm text-green-600';}
-        else{msg.textContent=d.error||'Error';msg.className='text-center text-sm text-red-600';}
+        else{msg.textContent=d.error==='captcha failed'?'Couldn\'t verify you\'re human, try again':d.error||'Error';msg.className='text-center text-sm text-red-600';}
       }catch{msg.textContent='Network error';msg.className='text-center text-sm text-red-600';}
+      window.turnstile?.reset();
     };
   </script>
+  <script src="https://challenges.cloudflare.com/turnstile/v0/api.js" async defer></script>
 </body>
 </html>

functions/api/subscribe.js

@@ -1,30 +0,0 @@
-export async function onRequestPost({ request, env }) {
-  const { email } = await request.json().catch(() => ({}));
-  if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email))
-    return new Response('{"error":"Invalid email"}', { status: 400, headers: { 'Content-Type': 'application/json' } });
-
-  const c = request.cf || {};
-  const geo = [c.city, c.region, c.country].filter(Boolean).join(', ') || 'Unknown';
-
-  const res = await fetch('https://api.resend.com/contacts', {
-    method: 'POST',
-    headers: {
-      'Content-Type': 'application/json',
-      'Authorization': `Bearer ${env.RESEND_TOKEN}`
-    },
-    body: JSON.stringify({ email })
-  });
-
-  if (!res.ok) {
-    const text = await res.text();
-    return new Response(`{"error":"Resend error: ${text}"}`, { status: 500, headers: { 'Content-Type': 'application/json' } });
-  }
-
-  await fetch(env.NTFY_URL, {
-    method: 'POST',
-    headers: { Priority: '3', Title: `📬 ${geo}` },
-    body: email
-  });
-
-  return new Response('{"ok":true}', { headers: { 'Content-Type': 'application/json' } });
-}

functions/api/unsubscribe.js

@@ -1,27 +0,0 @@
-export async function onRequestPost({ request, env }) {
-  const { email } = await request.json().catch(() => ({}));
-  if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email))
-    return new Response('{"error":"Invalid email"}', { status: 400, headers: { 'Content-Type': 'application/json' } });
-
-  const res = await fetch('https://api.resend.com/contacts', {
-    method: 'POST',
-    headers: {
-      'Content-Type': 'application/json',
-      'Authorization': `Bearer ${env.RESEND_TOKEN}`
-    },
-    body: JSON.stringify({ email, unsubscribed: true })
-  });
-
-  if (!res.ok) {
-    const text = await res.text();
-    return new Response(`{"error":"Resend error: ${text}"}`, { status: 500, headers: { 'Content-Type': 'application/json' } });
-  }
-
-  await fetch(env.NTFY_URL, {
-    method: 'POST',
-    headers: { Priority: '3', Title: `🔕 Unsubscribe` },
-    body: email
-  });
-
-  return new Response('{"ok":true}', { headers: { 'Content-Type': 'application/json' } });
-}

unsubscribe.html

@@ -41,7 +41,7 @@
       msg.textContent='Processing...';
       msg.classList.remove('hidden');
       try{
-        const r=await fetch('/api/unsubscribe',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({email:document.getElementById('email').value})});
+        const r=await fetch('https://newsletter.planetrenox.com/api/unsub',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({pool:'lynchmark',email:document.getElementById('email').value})});
         const d=await r.json();
         if(d.ok){msg.textContent='✓ Unsubscribed';msg.className='text-center text-sm text-green-600';}
         else{msg.textContent=d.error||'Error';msg.className='text-center text-sm text-red-600';}