twilio_number_checking.go

const (
	twilioAuth = "Basic {base64}" // https://www.twilio.com/docs/quickstart/php/lookups
)

// doTwilioCheck returns true if exists
func doTwilioCheck(number string) (exists bool, err error) {
	url := fmt.Sprintf("https://lookups.twilio.com/v1/PhoneNumbers/%s", number)
	
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return false, err
	}
	
	req.Header.Add("authorization", twilioAuth)
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		return false, err
	}
	defer res.Body.Close()
	
	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return false, err
	}

	var parsed map[string]interface{}
	err = json.Unmarshal(body, &parsed)
	if err != nil {
		return false, err
	}

	return parsed["status"] == nil, nil
}