telegram-bot-api/README.md

Golang bindings for the Telegram Bot API

All methods are fairly self-explanatory, and reading the godoc page should explain everything. If something isn't clear, open an issue or submit a pull request.

The scope of this project is just to provide a wrapper around the API without any additional features. There are other projects for creating something with plugins and command handlers without having to design all that yourself.

Join the development group if you want to ask questions or discuss development.

Example

First, ensure the library is installed and up to date by running go get -u github.com/go-telegram-bot-api/telegram-bot-api/v5.

This is a very simple bot that just displays any gotten updates, then replies it to that chat.

package main

import (
	"log"

	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
)

func main() {
	bot, err := tgbotapi.NewBotAPI("MyAwesomeBotToken")
	if err != nil {
		log.Panic(err)
	}

	bot.Debug = true

	log.Printf("Authorized on account %s", bot.Self.UserName)

	u := tgbotapi.NewUpdate(0)
	u.Timeout = 60

	updates, err := bot.GetUpdatesChan(u)

	for update := range updates {
		if update.Message == nil { // ignore any non-Message Updates
			continue
		}

		log.Printf("[%s] %s", update.Message.From.UserName, update.Message.Text)

		msg := tgbotapi.NewMessage(update.Message.Chat.ID, update.Message.Text)
		msg.ReplyToMessageID = update.Message.MessageID

		bot.Send(msg)
	}
}

There are more examples on the site with detailed information on how to do many kinds of things. It's a great place to get started on using keyboards, commands, or other kinds of reply markup.

If you need to use webhooks (if you wish to run on Google App Engine), you may use a slightly different method.

package main

import (
	"log"
	"net/http"

	"github.com/go-telegram-bot-api/telegram-bot-api"
)

func main() {
	bot, err := tgbotapi.NewBotAPI("MyAwesomeBotToken")
	if err != nil {
		log.Fatal(err)
	}

	bot.Debug = true

	log.Printf("Authorized on account %s", bot.Self.UserName)

	_, err = bot.SetWebhook(tgbotapi.NewWebhookWithCert("https://www.google.com:8443/"+bot.Token, "cert.pem"))
	if err != nil {
		log.Fatal(err)
	}
	info, err := bot.GetWebhookInfo()
	if err != nil {
		log.Fatal(err)
	}
	if info.LastErrorDate != 0 {
		log.Printf("Telegram callback failed: %s", info.LastErrorMessage)
	}
	updates := bot.ListenForWebhook("/" + bot.Token)
	go http.ListenAndServeTLS("0.0.0.0:8443", "cert.pem", "key.pem", nil)

	for update := range updates {
		log.Printf("%+v\n", update)
	}
}

If you need to publish your bot on AWS Lambda(or something like it) and AWS API Gateway, you can use such example:

In this code used AWS Lambda Go net/http server adapter algnhsa

package main

import (
	"github.com/akrylysov/algnhsa"
	"github.com/go-telegram-bot-api/telegram-bot-api"
	"log"
	"net/http"
)

func answer(w http.ResponseWriter, r *http.Request) {
	bot, err := tgbotapi.NewBotAPI("MyAwesomeBotToken")
	if err != nil {
		log.Fatal(err)
	}

	bot.Debug = true
	updates := bot.ListenForWebhookRespReqFormat(w, r)
	for update := range updates {
		if update.Message == nil {
			continue
		}
		log.Printf("[%s] %s", update.Message.From.UserName, update.Message.Text)

		msg := tgbotapi.NewMessage(update.Message.Chat.ID, update.Message.Text)
		msg.ReplyToMessageID = update.Message.MessageID
		_, err := bot.Send(msg)
		if err != nil {
			log.Printf("Error send message: %s | Error: %s", msg.Text, err.Error())
		}
	}
}

func setWebhook(_ http.ResponseWriter, _ *http.Request) {
	bot, err := tgbotapi.NewBotAPI("MyAwesomeBotToken")
	if err != nil {
		log.Fatal(err)
	}

	bot.Debug = true

	log.Printf("Authorized on account %s", bot.Self.UserName)

	_, err = bot.SetWebhook(tgbotapi.NewWebhook("https://your_api_gateway_address.com/"+bot.Token))
	if err != nil {
		log.Fatal(err)
	}
	info, err := bot.GetWebhookInfo()
	if err != nil {
		log.Fatal(err)
	}
	if info.LastErrorDate != 0 {
		log.Printf("Telegram callback failed: %s", info.LastErrorMessage)
	}
}

func main() {
	http.HandleFunc("/set_webhook", setWebhook)
	http.HandleFunc("/MyAwesomeBotToken", answer)
	algnhsa.ListenAndServe(http.DefaultServeMux, nil)
}

If you need, you may generate a self-signed certificate, as this requires HTTPS / TLS. The above example tells Telegram that this is your certificate and that it should be trusted, even though it is not properly signed.

openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 3560 -subj "//O=Org\CN=Test" -nodes

Now that Let's Encrypt is available, you may wish to generate your free TLS certificate there.