I made a LINE BOT that returns parrots with Go

I made a LINE BOT that returns parrots by referring to the sample program below. https://github.com/line/line-bot-sdk-go/blob/master/examples/echo_bot/server.go

Deploying to AWS or Heroku is a hassle, so I used ngrok to publish the service from my local device to the outside world. After that, it is not preferable to publish the channel token etc. when publishing the program on GitHub, so I got it from the ini file.



package main

import (


type Config struct {
	channelSecrt string
	channelToken string

var Cnf Config

func init() {
	c, _ := ini.Load("config.ini")
	Cnf = Config{
		channelSecrt: c.Section("lineBotApi").Key("secret").String(),
		channelToken: c.Section("lineBotApi").Key("token").String(),

func main() {
	http.HandleFunc("/callback", lineHandler)
	log.Fatal(http.ListenAndServe(":8080", nil))

func lineHandler(w http.ResponseWriter, r *http.Request) {
	bot, err := linebot.New(
	if err != nil {
	events, err := bot.ParseRequest(r)
	if err != nil {
		if err == linebot.ErrInvalidSignature {
		} else {
	for _, event := range events {
		if event.Type == linebot.EventTypeMessage {
			switch message := event.Message.(type) {
			case *linebot.TextMessage:
				if _, err = bot.ReplyMessage(event.ReplyToken, linebot.NewTextMessage(message.Text)).Do(); err != nil {
			case *linebot.StickerMessage:
				replyMessage := fmt.Sprintf(
					"sticker id is %s, stickerResourceType is %s", message.StickerID, message.StickerResourceType)
				if _, err = bot.ReplyMessage(event.ReplyToken, linebot.NewTextMessage(replyMessage)).Do(); err != nil {
	if err := http.ListenAndServe(":"+os.Getenv("PORT"), nil); err != nil {


secret = <Secret token>
token = <Channel access token>

What is ngrok?

A service that exposes a locally running web service to the outside world. > Ngrok exposes the local server behind NAT and firewalls to the public Internet through a secure tunnel. https://ngrok.com/product

This time, the following command is executed.

ngrok http 8080

The URL in the red frame is registered in the Webhook URL of the LINE BOT setting.



Next, I will try to create a BOT that allows daily conversation using the Talk API. https://a3rt.recruit-tech.co.jp/product/talkAPI/

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