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

// ---- Helper: generate signed token (valid 1 hour) ---- function generateToken(fileId) const expires = Math.floor(Date.now() / 1000) + 3600; // epoch seconds const data = `$fileId:$expires`; const signature = crypto .createHmac('sha256', process.env.DOWNLOAD_SECRET) .update(data) .digest('hex'); return Buffer.from(`$data:$signature`).toString('base64url'); Tarzan -enlace de descarga normal-

// server.js require('dotenv').config(); // make sure DOWNLOAD_SECRET is set const express = require('express'); const router: downloadRouter = require('./download'); return crypto