generateCertificateForDocument.js

import { sign } from 'tweetnacl';
import { Buffer } from 'buffer';

const secretKey = Buffer.from('…', 'base64');

const generateCertificateForDocument = 
(filename: string, sha256: string, user: string, email: string, userId: string, companyId: string, createdByLedgy: boolean): string => {
  const certificate = JSON.stringify({
    filename, sha256, user, email, company, createdByLedgy, userId, companyId, version: '1.0.0',
  });
  const signedCertificate = sign(Buffer.from(certificate), secretKey);
  return Buffer.from(signedCertificate).toString('base64');
}