Added IPNS support for ENS contenthash.

Author: ricmoo

packages/providers/src.ts/base-provider.ts

@@ -640,6 +640,15 @@ export class Resolver implements EnsResolver {
             }
         }
 
+        // IPNS (CID: 1, Type: libp2p-key)
+        const ipns = hexBytes.match(/^0xe5010172(([0-9a-f][0-9a-f])([0-9a-f][0-9a-f])([0-9a-f]*))$/);
+        if (ipns) {
+            const length = parseInt(ipns[3], 16);
+            if (ipns[4].length === length * 2) {
+                return "ipns:/\/" + Base58.encode("0x" + ipns[1]);
+            }
+        }
+
         // Swarm (CID: 1, Type: swarm-manifest; hash/length hard-coded to keccak256/32)
         const swarm = hexBytes.match(/^0xe40101fa011b20([0-9a-f]*)$/)
         if (swarm) {