fix: add ipv6Check regex for private address

Author: Marcus Pousette

packages/utils/src/private-ip.ts

@@ -41,6 +41,7 @@ function ipv4Check (ipAddr: string): boolean {
 function ipv6Check (ipAddr: string): boolean {
   return /^::$/.test(ipAddr) ||
     /^::1$/.test(ipAddr) ||
+    /^::ffff:([0-9a-fA-F]{1,4}):([0-9a-fA-F]{1,4})$/.test(ipAddr) ||
     /^::f{4}:([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/.test(ipAddr) ||
     /^::f{4}:0.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/.test(ipAddr) ||
     /^64:ff9b::([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/.test(ipAddr) ||

packages/utils/test/multiaddr/is-private.spec.ts

@@ -30,7 +30,8 @@ describe('multiaddr isPrivate', () => {
   it('identifies private ip6 multiaddrs', () => {
     [
       multiaddr('/ip6/fd52:8342:fc46:6c91:3ac9:86ff:fe31:7095/tcp/1000'),
-      multiaddr('/ip6/fd52:8342:fc46:6c91:3ac9:86ff:fe31:1/tcp/1000')
+      multiaddr('/ip6/fd52:8342:fc46:6c91:3ac9:86ff:fe31:1/tcp/1000'),
+      multiaddr('/ip6/::ffff:7f00:1/tcp/1000')
     ].forEach(ma => {
       expect(isPrivate(ma)).to.eql(true)
     })