text: /**
   * Copyright 2015 IBM Corp. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  'use strict';
  
  // security.js
  var secure  = require('express-secure-only'),
    rateLimit = require('express-rate-limit'),
    helmet    = require('helmet');
  
  module.exports = function (app) {
    app.enable('trust proxy');
  
    // 1. redirects http to https
    app.use(secure());
  
    // 2. helmet with defaults
    app.use(helmet());
  
    // 3. rate-limit to /api/
    app.use('/api/', rateLimit({
      windowMs: 20 * 1000, // seconds
      delayMs: 0,
      max: 3
    }));
  
  };
  