wireguard: add EndpointAddress.Name() removing the domain from Host

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/wireguard/config.go

@@ -3,6 +3,7 @@ package wireguard
 import (
 	"encoding/base64"
 	"errors"
+	"fmt"
 	"io"
 	"net/netip"
 	"strconv"
@@ -44,10 +45,29 @@ type PeerConfig struct {
 
 // EndpointAddress is a host:port pair to reach the Peer
 type EndpointAddress struct {
-	Name string
+	Host string
 	Port uint16
 }
 
+// Name returns the first part of a hostname
+func (ep EndpointAddress) Name() string {
+	before, _, _ := strings.Cut(ep.Host, ".")
+	return before
+}
+
+func (ep EndpointAddress) String() string {
+	switch {
+	case ep.Host == "":
+		return ""
+	case ep.Port == 0:
+		return ep.Host
+	case !strings.ContainsRune(ep.Host, ':'):
+		return fmt.Sprintf("%s:%v", ep.Host, ep.Port)
+	default:
+		return fmt.Sprintf("[%s]:%v", ep.Host, ep.Port)
+	}
+}
+
 // FromString sets the EndpointAddress from a given "[host]:port"
 func (ep *EndpointAddress) FromString(s string) error {
 	host, port, err := core.SplitHostPort(s)
@@ -55,7 +75,7 @@ func (ep *EndpointAddress) FromString(s string) error {
 		return err
 	}
 
-	ep.Name = host
+	ep.Host = host
 
 	switch {
 	case port != "":