index.js

/**
 * Copyright 2016 Google Inc. 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';

const functions = require('firebase-functions');
const ActionsSdkAssistant = require('actions-on-google').ActionsSdkAssistant;

/**
 * Endpoint which handles requests for a Google Assistant action which asks users to say a number
 * and read out the ordinal of that number.
 * e.g. If the user says "Twelve" the action will say "The ordinal of twelve is twelfth".
 */
exports.sayNumber = functions.https.onRequest((req, res) => {
  const assistant = new ActionsSdkAssistant({request: req, response: res});

  // List of re-prompts that are used when we did not understand a number from the user.
  const reprompts = [
    'I didn\'t hear a number',
    'If you\'re still there, what\'s the number?',
    'What is the number?'
  ];

  const actionMap = new Map();

  actionMap.set(assistant.StandardIntents.MAIN, assistant => {
    const inputPrompt = assistant.buildInputPrompt(true, `<speak>
        Hi! <break time="1"/>
        I can read out an ordinal number like <say-as interpret-as="ordinal">123</say-as>.
        Say a number.
      </speak>`, reprompts
    );
    assistant.ask(inputPrompt);
  });

  actionMap.set(assistant.StandardIntents.TEXT, assistant => {
    const rawInput = assistant.getRawInput();
    if (rawInput === 'bye') {
      assistant.tell('Goodbye!');
    } else if (isNaN(parseInt(rawInput, 10))) {
      const inputPrompt = assistant.buildInputPrompt(false, 'I didn\'t quite get that, what was the number?', reprompts);
      assistant.ask(inputPrompt);
    } else {
      const inputPrompt = assistant.buildInputPrompt(true, `<speak>
          The ordinal of <say-as interpret-as="cardinal">${rawInput}</say-as> is
          <say-as interpret-as="ordinal">${rawInput}</say-as>
        </speak>`, reprompts
      );
      assistant.ask(inputPrompt);
    }
  });

  assistant.handleRequest(actionMap);
});