藉由Google Cloud Function建構DialogFlow Fulfillment

透過GCP上的Cloud Function這項SaaS (Software as a Service) 服務，
我們能輕鬆快速地建構DialogFlow Fulfillment來達成我們今日的需求。
你也能參見官方撰寫於Qwiklabs的實作範例。
Google Assistant: Build an Application with Dialogflow and Cloud Functions

開啟內建編輯器

如果各位尚未進行任何設定，可以先完成下列文章的教學再接續下方的步驟
[Day12] 於DialogFlow中實踐對話流設計

首先，前往「Fulfillment」分頁。
開啟Inline Editor的功能，我們將透過他於GCP上建立雲端函式。
並以此撰寫程式來客製化回應。
開啟該功能後，系統會提示需要啟用GCP的付費功能。
請點擊「OPEN CLOUD CONSOLE」繼續操作。
跟著系統的導引建立帳單帳戶，並將其綁訂到這個專案上
現在，你已經成功開啟我們所需要的雲端編輯器啦!

透過Fulfillment修改Intent的回應

依照我們先前所提及的架構。
來客製化我們先前要設計的對話。

1. 複製貼上以下程式片段到「index.js」，取代原有的程式碼

'use strict';

// Import the Dialogflow module from the Actions on Google client library.
const {dialogflow} = require('actions-on-google');

// Import the firebase-functions package for deployment.
const functions = require('firebase-functions');

// Instantiate the Dialogflow client.
const app = dialogflow({debug: true});

// Handle the Dialogflow intent named 'favorite color'.
// The intent collects a parameter named 'color'.
app.intent('用戶輸入的顏色', (conv, {color}) => {
    
	// Respond with the specific response and end the conversation.
	if(color==="綠色"){conv.close('綠光戰警?');}
	else if(color==="紅色"){conv.close('感覺充滿喜氣');}
	else if(color==="藍色"){conv.close('藍色是最溫暖的顏色');}
	else {conv.close('真巧，我也喜歡'+color);}
    
});

// Set the DialogflowApp object to handle the HTTPS POST request.
exports.dialogflowFirebaseFulfillment = functions.https.onRequest(app);

2. 複製貼上以下程式片段到「package.json」，取代原有的程式碼

{
  "name": "dialogflowFirebaseFulfillment",
  "description": "This is the default fulfillment for a Dialogflow agents using Cloud Functions for Firebase",
  "version": "0.0.1",
  "private": true,
  "license": "Apache Version 2.0",
  "author": "Google Inc.",
  "engines": {
    "node": "10"
  },
  "scripts": {
    "start": "firebase serve --only functions:dialogflowFirebaseFulfillment",
    "deploy": "firebase deploy --only functions:dialogflowFirebaseFulfillment"
  },
  "dependencies": {
    "actions-on-google": "^2.2.0",
    "firebase-admin": "^5.13.1",
    "firebase-functions": "^2.0.2",
    "dialogflow": "^0.6.0",
    "dialogflow-fulfillment": "^0.5.0"
  }
}