fix(ip-input): allow IPv6 unspecified address

fixes #2183

Author: spliffone

projects/element-ng/ip-input/address-validators.ts

@@ -71,4 +71,5 @@ const validateSubnet = (cidr: string): boolean => {
   return subnet > 0 && subnet <= 128;
 };
 
-const matchIpV6 = (ip: string): boolean => !!ip.match(ipV6Regex) && !!URL.parse(`http://[${ip}]`);
+const matchIpV6 = (ip: string): boolean =>
+  (ip === '::' || !!ip.match(ipV6Regex)) && !!URL.parse(`http://[${ip}]`);

projects/element-ng/ip-input/si-ip6-input.directive.spec.ts

@@ -74,7 +74,8 @@ describe('SiIp6InputDirective', () => {
     '1::4:5:6:7:8',
     '1:2::4:5:6:7:8',
     '1::3:4:5:6:7:8',
-    '1::8'
+    '1::8',
+    '::' // Unspecified address
   ].forEach(i => {
     it(`should be valid with input ${i}`, () => {
       typeInput(i);