Static Google Map Signature

static-google-map-signature.js

const url = require('url');
const crypto = require('crypto');

const config = {
  secret: 'YOUR_SECRET',
  clientId: 'CLIENT_ID'
}

const generateSignature = (address) => {
  const request = url.parse(address);

  // You may need to decode this key into its original binary format
  const decodedSecret = Buffer.from(config.secret, 'base64');

  const algorithm = crypto.createHmac('sha1', decodedSecret);

  const hash = algorithm.update(request.path).digest('base64');

  // convert base64 to urlsafe base64
  const signature = hash
      .replace(/\+/g, '-') // Convert '+' to '-'
      .replace(/\//g, '_') // Convert '/' to '_'
      .replace(/=+$/, ''); // Remove ending '='

  return signature;

}

const requestUrl = `https://maps.googleapis.com/maps/api/staticmap?center=40.714%2c%20-73.998&zoom=12&size=400x400&client=${config.clientId}`;
const signature = generateSignature(requestUrl);

console.log(`${requestUrl}&signature=${signature}`)