Telegram bot

bot.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"strconv"
)

type GetUpdates struct {
	Ok     bool `json:"ok"`
	Result []struct {
		UpdateID int `json:"update_id"`
		Message  struct {
			MessageID int `json:"message_id"`
			From      struct {
				ID        int    `json:"id"`
				FirstName string `json:"first_name"`
				LastName  string `json:"last_name"`
				Username  string `json:"username"`
			} `json:"from"`
			Chat struct {
				ID        int    `json:"id"`
				FirstName string `json:"first_name"`
				LastName  string `json:"last_name"`
				Username  string `json:"username"`
				Type      string `json:"type"`
			} `json:"chat"`
			Date int    `json:"date"`
			Text string `json:"text"`
		} `json:"message"`
	} `json:"result"`
}

type SendMessage struct {
	Ok     bool `json:"ok"`
	Result struct {
		MessageID int `json:"message_id"`
		From      struct {
			ID        int    `json:"id"`
			FirstName string `json:"first_name"`
			Username  string `json:"username"`
		} `json:"from"`
		Chat struct {
			ID        int    `json:"id"`
			FirstName string `json:"first_name"`
			LastName  string `json:"last_name"`
			Username  string `json:"username"`
			Type      string `json:"type"`
		} `json:"chat"`
		Date int    `json:"date"`
		Text string `json:"text"`
	} `json:"result"`
}

// Substitute your token here
var token = "Your token here"

func main() {
	url := "https://api.telegram.org/bot" + token + "/getUpdates"
	nurl := fmt.Sprintf(url)

	// Build the request
	req, err := http.NewRequest("GET", nurl, nil)
	if err != nil {
		log.Fatal("NewRequest: ", err)
		return
	}

	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	// For control over HTTP client headers,
	// redirect policy, and other settings,
	// create a Client
	// A Client is an HTTP client
	client := &http.Client{}

	// Send the request via a client
	// Do sends an HTTP request and
	// returns an HTTP response
	resp, err := client.Do(req)
	if err != nil {
		log.Fatal("Do: ", err)
		return
	}

	// Callers should close resp.Body
	// when done reading from it
	// Defer the closing of the body
	defer resp.Body.Close()

	// Fill the record with the data from the JSON
	var record GetUpdates

	// Use json.Decode for reading streams of JSON data
	if err := json.NewDecoder(resp.Body).Decode(&record); err != nil {
		log.Println(err)
	}

	chatid := strconv.Itoa(record.Result[0].Message.Chat.ID)

	// The Bot now sends a message to chatid
	url = "https://api.telegram.org/bot" + token + "/sendMessage?chat_id=" + chatid + "&text='Message from SMTFirstBot for '" + record.Result[0].Message.Chat.Username
	nurl = fmt.Sprintf(url)

	req, err = http.NewRequest("GET", nurl, nil)
	if err != nil {
		log.Fatal("NewRequest: ", err)
		return
	}

	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err = client.Do(req)
	if err != nil {
		log.Fatal("Do: ", err)
		return
	}

	defer resp.Body.Close()

	var newrecord SendMessage

	if err := json.NewDecoder(resp.Body).Decode(&newrecord); err != nil {
		log.Println(err)
	}
}