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src/routes/g/[slug]/[[timestamp]]/zip/+server.js

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+import StreamZip from 'node-stream-zip';
+import sharp from 'sharp';
+
+/** @type {import('./$types').RequestHandler} */
+export async function GET({ params }) {
+
+  let entryData = null;
+  try {
+    const zip = new StreamZip.async({ file: `./zip/${params.slug}.zip` });
+    const entries = Object.values(await zip.entries()).filter(entry => entry.name.endsWith('.jpg'));
+    const entry = entries[Math.floor(Math.random() * entries.length)];
+    const content = await zip.entryData(entry.name);
+    await zip.close();
+    entryData = await sharp(content).resize(400).avif({ quality: 70, effort: 0 }).toBuffer()
+  } catch (err) {
+    console.error(err);
+  }
+  return new Response(entryData, {
+    headers: {
+      'Content-Type': 'image/avif',
+      'Content-Disposition': 'inline'
+    }
+  });
+}