'use strict';
const line = require('@line/bot-sdk');
const express = require('express');

const CHANNEL_ID = "";
const CHANNEL_SECRET = "";
const CHANNEL_ACCESS_TOKEN = "";

var config = {
  channelId: CHANNEL_ID,
  channelSecret: CHANNEL_SECRET,
  channelAccessToken: CHANNEL_ACCESS_TOKEN
};

const client = new line.Client(config);
const app = express()

// register a webhook handler with middleware
// about the middleware, please refer to doc
app.post('/callback', line.middleware(config), (req, res) => {
  Promise
    .all(req.body.events.map(handleEvent))
    .then((result) => res.json(result))
    .catch((err) => {
      console.error(err);
      res.status(500).end();
    });
});

// event handler
function handleEvent(event) {
  if (event.type !== 'message' || event.message.type !== 'text') {
    // ignore non-text-message event
    return Promise.resolve(null);
  }

  // create a echoing text message
  const echo = { type: 'text', text: event.source.userId };

  // use reply API
  return client.replyMessage(event.replyToken, echo);
}

// listen on port
const port = process.env.PORT || 3000;
app.listen(port, () => {
  console.log(`listening on ${port}`);
});

  // create a echoing text message
  const echo = { type: 'text', text: event.source.userId };

curl -v -X POST https://api.line.me/v2/bot/message/push \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer {channel access token}' \
-d '{
    "to": "U4af4980629...",
    "messages":[
        {
            "type":"text",
            "text":"Hello, world1"
        },
        {
            "type":"text",
            "text":"Hello, world2"
        }
    ]
}'

[
  {
    "type": "text",
    "text": "HAPPY BIRTH DAY！"
  },
  {
    "type": "imagemap",
    "baseUrl": "https://hogehoge/birthday",
    "altText": "お誕生日おめでとうございます！",
    "baseSize": {
      ...
    },
    "video": {
      "originalContentUrl": "https://hogehoge/birthday_movie.mp4",
      "previewImageUrl": "https://hogehoge/birthdat_movie_preview.png",
      "area": {
         ...
      }
    },
    "actions": [
      {
           ...
]