Alexaのためのローカル開発環境を整備する

> node --version
v8.11.3

> mkdir alexa-ex5
> cd alexa-ex5
> npm init
package name: (alexa-ex5)
version: (1.0.0)
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to C:\users\koji\src\alexa-book\5\alexa-ex5\package.json:

{
  "name": "alexa-ex5",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

> npm install ask-sdk
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN alexa-ex5@1.0.0 No description
npm WARN alexa-ex5@1.0.0 No repository field.

+ ask-sdk@2.0.7
added 18 packages in 5.078s

リスト1：Alexa Skills Kit SDKの項目が追加されたpackage.json

{
  "name": "alexa-ex5",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "ask-sdk": "^2.0.7"
  }
}

リスト2：コード例：alexa-ex5/index.js

// （1）Alexa Skills Kit SDK を読み込む
const Alexa = require('ask-sdk-core');

// （2）リクエストハンドラーを定義する
const LaunchRequestHandler = {
  canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'LaunchRequest';
  },
  handle(handlerInput) {
    return handlerInput.responseBuilder
      .speak('あいさつスキルです。こんにちは、と言ってみてください')
      .reprompt('あいさつスキルです。こんにちは、と言ってみてください')
      .getResponse();
  },
};

const GreetingIntentHandler = {
  canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'IntentRequest'
      && handlerInput.requestEnvelope.request.intent.name === 'GreetingIntent';
  },
  handle(handlerInput) {
    const speechText = 'こんにちは';

    return handlerInput.responseBuilder
      .speak(speechText)
      .withSimpleCard('あいさつスキル', speechText)
      .getResponse();
  },
};

const HelpIntentHandler = {
  canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'IntentRequest'
      && handlerInput.requestEnvelope.request.intent.name === 'AMAZON.HelpIntent';
  },
  handle(handlerInput) {
    const speechText = 'You can say hello to me!';

    return handlerInput.responseBuilder
      .speak(speechText)
      .reprompt(speechText)
      .withSimpleCard('Hello World', speechText)
      .getResponse();
  },
};

const CancelAndStopIntentHandler = {
  canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'IntentRequest'
      && (handlerInput.requestEnvelope.request.intent.name === 'AMAZON.CancelIntent'
        || handlerInput.requestEnvelope.request.intent.name === 'AMAZON.StopIntent');
  },
  handle(handlerInput) {
    const speechText = 'Goodbye!';

    return handlerInput.responseBuilder
      .speak(speechText)
      .withSimpleCard('Hello World', speechText)
      .getResponse();
  },
};

const SessionEndedRequestHandler = {
  canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'SessionEndedRequest';
  },
  handle(handlerInput) {
    console.log(`Session ended with reason: ${handlerInput.requestEnvelope.request.reason}`);

    return handlerInput.responseBuilder.getResponse();
  },
};

// （3）エラーハンドラーを定義する
const ErrorHandler = {
  canHandle() {
    return true;
  },
  handle(handlerInput, error) {
    console.log(`Error handled: ${error.message}`);

    return handlerInput.responseBuilder
      .speak('うまく聞き取れませんでした。')
      .reprompt('もういちどお願いします。')
      .getResponse();
  },
};

// （4）Lambda 関数ハンドラーを定義する
const skillBuilder = Alexa.SkillBuilders.custom();

exports.handler = skillBuilder
  .addRequestHandlers(
    LaunchRequestHandler,
    GreetingIntentHandler,
    HelpIntentHandler,
    CancelAndStopIntentHandler,
    SessionEndedRequestHandler
  )
  .addErrorHandlers(ErrorHandler)
  .lambda();

リスト3：

canHandle(handlerInput) {
   return handlerInput.requestEnvelope.request.type === 'LaunchRequest';
}

リスト4：

canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'IntentRequest'
      && handlerInput.requestEnvelope.request.intent.name === 'GreetingIntent';
}

リスト5：

handle(handlerInput) {
    return handlerInput.responseBuilder
      .speak('あいさつスキルです')
      .reprompt('こんにちは、と言ってみてください')
      .getResponse();
}