add simple local sample serving

website/src/pages/strudel.json.js

@@ -0,0 +1,45 @@
+import { readdir } from 'fs/promises';
+import { dirname, join, resolve } from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+async function getFilesInDirectory(directory) {
+  let files = [];
+  const dirents = await readdir(directory, { withFileTypes: true });
+  for (const dirent of dirents) {
+    const fullPath = join(directory, dirent.name);
+    if (dirent.isDirectory()) {
+      const subFiles = await getFilesInDirectory(fullPath);
+      files = files.concat(subFiles);
+    } else {
+      files.push(fullPath);
+    }
+  }
+  return files;
+}
+
+export async function GET() {
+  let dir;
+  if (import.meta.env.MODE === 'production') {
+    // in prod (pnpm build), the path is "/website/dist/chunks/pages"
+    dir = '../../../public/samples';
+  } else {
+    // in dev (pnpm dev), the path is "/website/src/pages"
+    dir = '../../public/samples';
+  }
+  const directory = resolve(__dirname, dir);
+  const files = await getFilesInDirectory(directory);
+  let banks = {};
+  files
+    .filter((f) => ['wav', 'mp3', 'ogg'].includes(f.split('.').slice(-1)[0].toLowerCase()))
+    .forEach((url) => {
+      const [bank] = url.split('/').slice(-2);
+      banks[bank] = banks[bank] || [];
+      const rel = url.split('/public/samples/')[1];
+      banks[bank].push(rel);
+    });
+  banks._base = '/samples/';
+  return new Response(JSON.stringify(banks));
+}