proxy.js

var Hashes = require('jshashes');
var request = require('request');

exports.callEndpoint = function(appId, appSecret, endpoint, query, token, callback) {
  query = query || {};
  query.token = token;
  query.hash = generateAuthHash(token);
  var uri = 'https://platform.shopyourway.com' + endpoint;

  var options = {
    uri: uri,
    qs: query,
    json: true
  };

  request(options, function (err, response, body) {
    if (err) {
      var errMsg = err && err.message ? ' : ' + err.message : '';
      callback(new Error('Error while trying to call platform endpoint ' + endpoint + errMsg));
      return;
    }
    callback(null, body);
  });

  function generateAuthHash(token) {
    return generateHash(token + appSecret);
  }

  function generateHash(str) {
    return new Hashes.SHA256().hex(str);
  }
};