Check Telegram Authorization in golang

checkTelegramAuthorization.go

// check telegram authorization on golang
//php version: https://gist.github.com/anonymous/6516521b1fb3b464534fbc30ea3573c2#file-check_authorization-php
//usage:
/*
func TestTg(t *testing.T) {
	data := "id=1263310&first_name=Vadim&last_name=Kulibaba&username=recoilme&photo_url=https://t.me/i/userpic/320/recoilme.jpg&auth_date=1518535618&hash=1d7069137bf517a63261ee156919a057dca93a416118eebfd0d8f5697442cdce"
	token := "YOUR:TOKEN"
	if !checkTelegramAuthorization(data, token) {
		t.Fail()
	}
}*/

func checkTelegramAuthorization(data, token string) bool {
	params, _ := url.ParseQuery(data)
	strs := []string{}
	var hash = ""
	for k, v := range params {
		if k == "hash" {
			hash = v[0]
			continue
		}
		strs = append(strs, k+"="+v[0])
	}
	sort.Strings(strs)
	var imploded = ""
	for _, s := range strs {
		if imploded != "" {
			imploded += "\n"
		}
		imploded += s
	}
	sha256hash := sha256.New()
	io.WriteString(sha256hash, token)
	hmachash := hmac.New(sha256.New, sha256hash.Sum(nil))
	io.WriteString(hmachash, imploded)
	ss := hex.EncodeToString(hmachash.Sum(nil))
	return hash == ss
}

Thank you a lot!

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