9BzawE92

1const crypto = require('crypto');
2
3module.exports = (secretKey, ttl, signature) => {
4  try {
5    let sign = Buffer.from(signature, 'base64').toString('utf8');
6    sign = JSON.parse(sign);
7
8    if (!sign.timestamp || !sign.hash) return false;
9
10    const signedHash = crypto
11      .createHmac('sha1', secretKey)
12      .update(sign.timestamp)
13      .digest('hex');
14
15    if (signedHash !== sign.hash || sign.timestamp < (((new Date().getTime() / 1000) | 0) - ttl).toString()) return false;
16
17    return true;
18  } catch (err) {
19    return false;
20  }
21};