Add Cache-Control headers to nostr.json responses

src/controllers/well-known/nostr.ts

@@ -1,36 +1,50 @@
+import { NostrJson } from '@nostrify/nostrify';
 import { z } from 'zod';
 
 import { AppController } from '@/app.ts';
 import { localNip05Lookup } from '@/utils/nip05.ts';
 
-const nameSchema = z.string().min(1).regex(/^\w+$/);
+const nameSchema = z.string().min(1).regex(/^[\w.-]+$/);
+const emptyResult: NostrJson = { names: {}, relays: {} };
 
 /**
  * Serves NIP-05's nostr.json.
  * https://github.com/nostr-protocol/nips/blob/master/05.md
  */
 const nostrController: AppController = async (c) => {
+  // If there are no query parameters, this will always return an empty result.
+  if (!Object.entries(c.req.queries()).length) {
+    c.header('Cache-Control', 'max-age=31536000, public, immutable');
+    return c.json(emptyResult);
+  }
+
   const store = c.get('store');
 
   const result = nameSchema.safeParse(c.req.query('name'));
   const name = result.success ? result.data : undefined;
-
   const pointer = name ? await localNip05Lookup(store, name) : undefined;
 
   if (!name || !pointer) {
-    return c.json({ names: {}, relays: {} });
+    // Not found, cache for 5 minutes.
+    c.header('Cache-Control', 'max-age=300, public');
+    return c.json(emptyResult);
   }
 
-  const { pubkey, relays } = pointer;
+  const { pubkey, relays = [] } = pointer;
 
-  return c.json({
+  // It's found, so cache for 12 hours.
+  c.header('Cache-Control', 'max-age=43200, public');
+
+  return c.json(
+    {
       names: {
         [name]: pubkey,
       },
       relays: {
         [pubkey]: relays,
       },
-  });
+    } satisfies NostrJson,
+  );
 };
 
 export { nostrController };