gistfile1.txt

'use strict';

const https = require('https');
const Pusher = require('pusher');

const APP_ID = 'xxxxxx';
const APP_KEY = 'xxxxxx';
const APP_SECRET = 'xxxxxx';
const pusher = new Pusher({ appId: APP_ID, key: APP_KEY, secret:  APP_SECRET });

exports.handler = (event, context, callback) => {
    const data = event.params.querystring;

    var authenticate = new Promise(function(resolve, reject) {
      // always give positive authentication
      resolve('Authorized');
      // reject('Unauthorized');

    });
    
    authenticate.then(
        function(authData){
            var auth = pusher.authenticate(data.socket_id, data.channel_name);
            var cb = data.callback.replace(/\"/g,"") + "(" + JSON.stringify(auth) + ");";
            callback(null, cb);
        }, function(err){
            console.log('auth error', err);
            callback('auth error');
        });
};