feat: restructure client-side code

src/server/routes/audio.js

@@ -0,0 +1,58 @@
+import fs from 'fs';
+import path from 'path';
+import mime from 'mime';
+import { DATA_DIR } from '../config.js';
+
+export function registerAudioRoutes(app) {
+  app.head('/audio/:name', (req, res) => {
+    const name = req.params.name;
+    const filePath = path.join(DATA_DIR, name);
+    if (!filePath.startsWith(DATA_DIR)) return res.status(400).end();
+    if (!fs.existsSync(filePath)) return res.status(404).end();
+    const stat = fs.statSync(filePath);
+    const type = mime.getType(filePath) || 'audio/mpeg';
+    res.setHeader('Accept-Ranges', 'bytes');
+    res.setHeader('Content-Type', type);
+    res.setHeader('Content-Length', stat.size);
+    res.setHeader('Cache-Control', 'no-store');
+    return res.status(200).end();
+  });
+
+  app.get('/audio/:name', (req, res) => {
+    const name = req.params.name;
+    const filePath = path.join(DATA_DIR, name);
+    if (!filePath.startsWith(DATA_DIR)) return res.status(400).send('Invalid path');
+    if (!fs.existsSync(filePath)) return res.status(404).send('Not found');
+    const stat = fs.statSync(filePath);
+    const range = req.headers.range;
+    const type = mime.getType(filePath) || 'audio/mpeg';
+    res.setHeader('Accept-Ranges', 'bytes');
+    res.setHeader('Cache-Control', 'no-store');
+    if (range) {
+      const match = /bytes=(\d+)-(\d+)?/.exec(range);
+      let start = match && match[1] ? parseInt(match[1], 10) : 0;
+      let end = match && match[2] ? parseInt(match[2], 10) : stat.size - 1;
+      if (Number.isNaN(start)) start = 0;
+      if (Number.isNaN(end)) end = stat.size - 1;
+      start = Math.min(Math.max(0, start), Math.max(0, stat.size - 1));
+      end = Math.min(Math.max(start, end), Math.max(0, stat.size - 1));
+      if (start > end || start >= stat.size) {
+        res.setHeader('Content-Range', `bytes */${stat.size}`);
+        return res.status(416).end();
+      }
+      const chunkSize = end - start + 1;
+      res.writeHead(206, {
+        'Content-Range': `bytes ${start}-${end}/${stat.size}`,
+        'Content-Length': chunkSize,
+        'Content-Type': type,
+      });
+      fs.createReadStream(filePath, { start, end }).pipe(res);
+    } else {
+      res.writeHead(200, {
+        'Content-Length': stat.size,
+        'Content-Type': type,
+      });
+      fs.createReadStream(filePath).pipe(res);
+    }
+  });
+}