initial import: random background api

functions/api/list.js

@@ -0,0 +1,22 @@
+import { getVariantPayload, loadManifest } from '../lib/background.js';
+
+export async function onRequestGet(context) {
+  const { request } = context;
+  const manifest = await loadManifest(request);
+
+  return Response.json(
+    {
+      generated_at: manifest?.generated_at || null,
+      variants: {
+        mobile: summarizeVariant(manifest, 'mobile'),
+        desktop: summarizeVariant(manifest, 'desktop'),
+      },
+    },
+    { headers: { 'Cache-Control': 'no-store, max-age=0', 'Access-Control-Allow-Origin': '*' } },
+  );
+}
+
+function summarizeVariant(manifest, variant) {
+  const { folder, images } = getVariantPayload(manifest, variant);
+  return { folder, count: images.length, images };
+}