fix: enodeToMultiaddress when using ipv6

Fixes #560

waku/v2/node/wakuoptions.go

@@ -230,12 +230,12 @@ func WithExternalIP(ip net.IP) WakuNodeOption {
 		params.addressFactory = func(inputAddr []multiaddr.Multiaddr) (addresses []multiaddr.Multiaddr) {
 			addresses = append(addresses, inputAddr...)
 
-			component := "/ip4/"
-			if ip.To4() == nil && ip.To16() != nil {
-				component = "/ip6/"
+			ipType := "/ip4/"
+			if utils.IsIPv6(ip.String()) {
+				ipType = "/ip6/"
 			}
 
-			hostAddrMA, err := multiaddr.NewMultiaddr(component + ip.String())
+			hostAddrMA, err := multiaddr.NewMultiaddr(ipType + ip.String())
 			if err != nil {
 				panic("Could not build external IP")
 			}

waku/v2/protocol/enr/enr.go

@@ -57,7 +57,18 @@ func enodeToMultiAddr(node *enode.Node) (multiaddr.Multiaddr, error) {
 		return nil, err
 	}
 
-	return multiaddr.NewMultiaddr(fmt.Sprintf("/ip4/%s/tcp/%d/p2p/%s", node.IP(), node.TCP(), peerID))
+	ipType := "ip4"
+	portNumber := node.TCP()
+	if utils.IsIPv6(node.IP().String()) {
+		ipType = "ip6"
+		var port enr.TCP6
+		if err := node.Record().Load(&port); err != nil {
+			return nil, err
+		}
+		portNumber = int(port)
+	}
+
+	return multiaddr.NewMultiaddr(fmt.Sprintf("/%s/%s/tcp/%d/p2p/%s", ipType, node.IP(), portNumber, peerID))
 }
 
 // Multiaddress is used to extract all the multiaddresses that are part of a ENR record

waku/v2/utils/ip.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"net"
+	"strings"
+)
+
+func IsIPv4(str string) bool {
+	ip := net.ParseIP(str)
+	return ip != nil && !strings.Contains(str, ":")
+}
+
+func IsIPv6(str string) bool {
+	ip := net.ParseIP(str)
+	return ip != nil && strings.Contains(str, ":")
+}