Merge pull request #718 from nats-io/fix-635

[FIX] identify ipv6 encoding an ipv4 as ipv6

Author: aricart

nats-base-client/servers.ts

@@ -25,12 +25,12 @@ import {
 } from "./core.ts";
 
 export function isIPV4OrHostname(hp: string): boolean {
-  if (hp.indexOf(".") !== -1) {
-    return true;
-  }
   if (hp.indexOf("[") !== -1 || hp.indexOf("::") !== -1) {
     return false;
   }
+  if (hp.indexOf(".") !== -1) {
+    return true;
+  }
   // if we have a plain hostname or host:port
   if (hp.split(":").length <= 2) {
     return true;

tests/servers_test.ts

@@ -131,4 +131,5 @@ Deno.test("servers - port 80", () => {
 Deno.test("servers - hostname only", () => {
   assertEquals(isIPV4OrHostname("hostname"), true);
   assertEquals(isIPV4OrHostname("hostname:40"), true);
+  assertEquals(isIPV4OrHostname("::ffff:35.234.43.228"), false);
 });