feat(core): added fromCredential and toNetworkId util functions to th…

…e RewardAccount type

packages/core/src/Cardano/Address/RewardAccount.ts

@@ -1,4 +1,4 @@
-import { Address, CredentialType } from './Address';
+import { Address, Credential, CredentialType } from './Address';
 import { Ed25519KeyHashHex, Hash28ByteBase16 } from '@cardano-sdk/crypto';
 import { NetworkId } from '../ChainId';
 import { OpaqueString, typedBech32 } from '@cardano-sdk/util';
@@ -15,6 +15,26 @@ export const RewardAccount = (value: string): RewardAccount => typedBech32(value
 RewardAccount.toHash = (rewardAccount: RewardAccount): Ed25519KeyHashHex =>
   Ed25519KeyHashHex(Address.fromBech32(rewardAccount).asReward()!.getPaymentCredential().hash);
 
+/**
+ * Creates a reward account from a given credential and network id.
+ *
+ * @param credential The credential.
+ * @param networkId The network id.
+ */
+RewardAccount.fromCredential = (credential: Credential, networkId: NetworkId): RewardAccount =>
+  RewardAccount(
+    RewardAddress.fromCredentials(networkId, { hash: credential.hash, type: credential.type }).toAddress().toBech32()
+  );
+
+/**
+ * Returns the network id encoded in the given reward account.
+ *
+ * @param rewardAccount The reward account.
+ * @returns The network id.
+ */
+RewardAccount.toNetworkId = (rewardAccount: RewardAccount): NetworkId =>
+  Address.fromBech32(rewardAccount).asReward()!.toAddress().getNetworkId();
+
 /**
  * Creates a reward account from a given key hash and network id.
  *

packages/core/test/Cardano/Address/RewardAccount.test.ts

@@ -1,4 +1,5 @@
 import * as Crypto from '@cardano-sdk/crypto';
+import * as cip19TestVectors from '../../../../util-dev/src/Cip19TestVectors';
 import { Cardano } from '../../../src';
 import { typedBech32 } from '@cardano-sdk/util';
 
@@ -40,4 +41,22 @@ describe('Cardano/Address/RewardAccount', () => {
       expect(rewardAccount.startsWith('stake_test')).toBe(true);
     });
   });
+
+  describe('fromCredential', () => {
+    it('creates can create a reward account given a credential and a network id', () => {
+      const rewardAccount = Cardano.RewardAccount.fromCredential(
+        cip19TestVectors.KEY_STAKE_CREDENTIAL,
+        Cardano.NetworkId.Mainnet
+      );
+      expect(rewardAccount).toBe(cip19TestVectors.rewardKey);
+    });
+  });
+
+  describe('toNetworkId', () => {
+    it('get the correct network id from a reward account', () => {
+      expect(Cardano.RewardAccount.toNetworkId(Cardano.RewardAccount(cip19TestVectors.rewardKey))).toBe(
+        Cardano.NetworkId.Mainnet
+      );
+    });
+  });
 });