phone_parsing.go

package main 

import (
	"github.com/pkg/errors"
	"github.com/ttacon/libphonenumber"
)

var (
	InvalidPhoneNumber = errors.New("phone number is invalid")
)

func GetNormalisedPhoneNumber(number string) (string, error) {
	num, err := libphonenumber.Parse(number, "")
	if err != nil {
		return "", errors.Wrap(err, "could not parse phone number")
	}

	if !libphonenumber.IsValidNumber(num) {
		return "", errors.WithStack(InvalidPhoneNumber)
	}

	return libphonenumber.Format(num, libphonenumber.E164), nil
}