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Because the exact scope can vary a lot (web‑app, desktop app, API, etc.), could you let me know a bit more about what you have in mind? Below are a few key points that will help me give you a precise, ready‑to‑implement solution:

module.exports = router, generateToken ; Tarzan -enlace de descarga normal-

res.writeHead(206, 'Content-Range': `bytes $start-$end/$total`, 'Accept-Ranges': 'bytes', 'Content-Length': chunkSize, 'Content-Type': 'application/octet-stream', 'Content-Disposition': `attachment; filename="$path.basename(filePath)"` ); Because the exact scope can vary a lot

// ---- Helper: validate token ---- function validateToken(token) try const decoded = Buffer.from(token, 'base64url').toString('utf8'); const [fileId, expires, signature] = decoded.split(':'); if (Date.now() / 1000 > Number(expires)) return null; // expired ready‑to‑implement solution: module.exports = router

const stream = fs.createReadStream(filePath); stream.pipe(res);

const router = express.Router();

// ---- Rate limiting (5 downloads / minute per IP) ---- const downloadLimiter = rateLimit( windowMs: 60_000, max: 5, message: error: 'Too many download attempts, please try again later.' );