address.go

package bifrost

import (
	"errors"
	"regexp"
	"strings"
)

var ErrIPv4Format = errors.New("invalid IPv4 format")

//Address to connect other peer
type Address struct {
	IP string
}

func validIP4(ipAddress string) bool {
	ipAddress = strings.Trim(ipAddress, " ")

	// just ip address xxx.xxx.xxx.xxx
	//re, _ := regexp.Compile(`^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$`)
	// ip with port number xxx.xxx.xxx.xxx:xxxx(x)  -> port number can be 0~99999 (real port numbers are in 0~65535 -> unsigned short 2bytes)
	re, _ := regexp.Compile(`^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]){1}([:][0-9][0-9][0-9][0-9][0-9]?)$`)
	if re.MatchString(ipAddress) {
		return true
	}

	return false
}

//format should be xxx.xxx.xxx.xxx:xxxx
func ToAddress(ipv4 string) (Address, error) {

	valid := validIP4(ipv4)

	if !valid {
		return Address{}, ErrIPv4Format
	}

	return Address{
		IP: ipv4,
	}, nil
}