Actions-on-Google to PubSub glue.js

## Actions-on-Google to PubSub glue.js
// Cloud Function serving as a webhook for Actions on Google, which ships
// a request to Cloud PubSub
//
// For more information, consult blog post:
// https://fixermark.blogspot.com/2017/08/publish-later-bridging-google-assistant.html
//
// 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.

const App = require('actions-on-google').ApiAiApp;
const pubsub = require('@google-cloud/pubsub')();

const projectId = '<add project ID>';

/**
 * Responds to any HTTP request that can provide a "message" field in the body.
 *
 * @param {!Object} req Cloud Function request context.
 * @param {!Object} res Cloud Function response context.
 */
exports.listOptions = function helloWorld(request, response) {
  if (request.get('Authorization') !=
      'Basic <The Base-64 encoding of the "username:password" string') {
    console.log('Invalid auth; request rejected.');
    response.sendStatus(401);
    return;
  }
  console.log('Payload: ' + JSON.stringify(request.body));
  const app = new App({request, response});

  const actionMap = new Map();
  actionMap.set('input.unknown', (app) => {
    const cmd = app.getRawInput();
    console.log('raw input: ' + cmd);
    const topic = pubsub.topic('belphanior-commands');
    topic.publish({data: Buffer.from(cmd)}, {raw: true}, (err) => console.log(err));

    app.tell('Executing ' + app.getRawInput());
  });
  app.handleRequest(actionMap);
};