main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"

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

func main() {
	godotenv.Load()

	bot, err := tgbotapi.NewBotAPI(os.Getenv("TELEGRAM_APITOKEN"))
	if err != nil {
		panic(err)
	}

	wh, _ := tgbotapi.NewWebhook(os.Getenv("SERVERLESS_CONTAINER_URL"))

	_, err = bot.Request(wh)
	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("/")
	go http.ListenAndServe(":"+os.Getenv("PORT"), nil)

	for update := range updates {
		log.Printf("%+v\n", update)
		msg := tgbotapi.NewMessage(update.Message.Chat.ID, fmt.Sprintf("Hello, %s!\n", update.Message.Chat.FirstName))
		bot.Send(msg)
	}
}