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ip.go
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ip.go
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package internal
import (
"encoding/json"
"fmt"
"net"
"net/http"
"strings"
"github.com/pkg/errors"
)
const (
IPv4ServerDefault = "https://ipv4.openspa.org"
IPv6ServerDefault = "https://ipv6.openspa.org"
)
func GetIP(ipv4Server, ipv6Server string) {
v4 := &PublicIPResolver{
ServerURL: ipv4Server,
}
v6 := &PublicIPResolver{
ServerURL: ipv6Server,
}
s := getIP(v4, v6)
fmt.Print(s)
}
type IPResolver interface {
GetPublicIP() (net.IP, error)
}
func getIP(ipv4, ipv6 IPResolver) string {
s := strings.Builder{}
s.WriteString("Public IPv4: ")
v4, err := ipv4.GetPublicIP()
if err != nil {
s.WriteString("\n")
s.WriteString("Error: ")
s.WriteString(err.Error())
s.WriteString("\n")
} else {
s.WriteString(v4.String())
}
s.WriteString("\n")
s.WriteString("Public IPv6: ")
v6, err := ipv6.GetPublicIP()
if err != nil {
s.WriteString("\n")
s.WriteString("Error: ")
s.WriteString(err.Error())
s.WriteString("\n")
} else {
s.WriteString(v6.String())
}
s.WriteString("\n")
return s.String()
}
var _ IPResolver = &PublicIPResolver{}
type PublicIPResolver struct {
ServerURL string
}
type publicIPResolverResponseBody struct {
IP string `json:"IP"`
}
func (r *PublicIPResolver) GetPublicIP() (net.IP, error) {
if r.ServerURL == "" {
return nil, errors.New("invalid server url")
}
resp, err := http.Get(r.ServerURL)
if err != nil {
return nil, errors.Wrap(err, "get request failed")
}
defer resp.Body.Close()
b := publicIPResolverResponseBody{}
d := json.NewDecoder(resp.Body)
if err := d.Decode(&b); err != nil {
return nil, errors.Wrap(err, "response decode")
}
ip := net.ParseIP(b.IP)
if ip == nil {
return nil, errors.New("ip parse")
}
return ip, nil
}