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index.js
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index.js
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"use strict";
const functions = require('firebase-functions');
const debug = require("debug")("*");
const crypto = require("crypto");
const axios = require("axios");
const Promise = require("bluebird");
// The Firebase Admin SDK to access the Firebase Realtime Database.
const admin = require('firebase-admin');
admin.initializeApp();
// If the order status is updated from "paid" to "ready", we send ready message through LINE
exports.notify_order_ready = functions.firestore.document('/order/{order_id}').onUpdate((change, context) => {
let order = change.after.data();
let previous_order = change.before.data();
if (!(order.status == "ready" && previous_order.status == "paid")){
return Promise.resolve();
}
if (!order.line_user_id){
debug("Required parameter: line_user_id not found.");
return Promise.reject("Required parameter: line_user_id not found.");
}
let event = {
type: "bot-express:push",
to: {
type: "user",
userId: order.line_user_id
},
intent: {
name: "notify_order_ready",
parameters: {
order: order
}
},
language: order.language || "en"
}
const body = {events: [event]};
const signature = crypto.createHmac('sha256', process.env.LINE_BOT_CHANNEL_SECRET).update(JSON.stringify(body)).digest('base64');
const url = process.env.LINE_BOT_WEBHOOK_URL;
const headers = {"X-Line-Signature": signature};
return axios.post(url, body, {
headers: headers,
});
});