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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)"` );

const expected = crypto .createHmac('sha256', process.env.DOWNLOAD_SECRET) .update(`$fileId:$expires`) .digest('hex');

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

// Simple in‑memory store for demo – replace with DB/Redis in prod const FILES = // fileId: absolutePath 'tarzan-v1.0.0': path.resolve(__dirname, '../files/Tarzan_v1.0.0.zip') ;

module.exports = router, generateToken ; 'Content-Range': `bytes $start-$end/$total`

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:

// 1️⃣ Verify token (if you require signed URLs) if (process.env.REQUIRE_SIGNED_URLS === 'true') tokenFileId !== fileId) return res.status(403).json( error: 'Invalid or expired token.' ); const expected = crypto .createHmac('sha256'

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