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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)"` );

// ---- 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

// 1️⃣ Verify token (if you require signed URLs) if (process.env.REQUIRE_SIGNED_URLS === 'true') const tokenFileId = validateToken(token); if (!tokenFileId Tarzan -enlace de descarga normal-

return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected)) ? fileId : null; catch (_) return null;

module.exports = router, generateToken ; parseInt(endStr, 10) : total - 1; const chunkSize

// 3️⃣ Stream with support for Range requests const stat = await fs.promises.stat(filePath); const total = stat.size; const range = req.headers.range;

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: 10) : total - 1

if (range) // Example: "bytes=0-1023" const [startStr, endStr] = range.replace(/bytes=/, '').split('-'); const start = parseInt(startStr, 10); const end = endStr ? parseInt(endStr, 10) : total - 1; const chunkSize = end - start + 1;

// 4️⃣ Basic logging (you can replace with a proper logger) console.log(`[DOWNLOAD] IP=$req.ip fileId=$fileId token=$token ? 'present' : 'none'`); );

// ---- 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.' );

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