add video thumbnail generation for opengraph

src/pages/video/[name]/thumbnail.jpg.ts

@@ -0,0 +1,26 @@
+import fs from 'node:fs';
+import type { APIContext, APIRoute } from 'astro';
+import { getVideoThumbnail, resolveVideo } from '@util/video.ts';
+
+async function handle(context: APIContext, headersOnly = false) {
+  const video = await resolveVideo(context.params.name ?? '');
+  if (!video) return new Response(null, { status: 404 });
+
+  const thumbnail = await getVideoThumbnail(video);
+  if (!thumbnail) return new Response(null, { status: 404 });
+
+  const stats = await fs.promises.stat(thumbnail.path);
+  const headers = {
+    'Content-Type': thumbnail.contentType,
+    'Content-Length': stats.size.toString(),
+    'Cache-Control': 'public, max-age=86400'
+  };
+
+  if (headersOnly) return new Response(null, { headers });
+
+  const data = await fs.promises.readFile(thumbnail.path);
+  return new Response(new Uint8Array(data), { headers });
+}
+
+export const HEAD: APIRoute = (context) => handle(context, true);
+export const GET: APIRoute = (context) => handle(context);