Use createNewVaultAndRestore from core KeyringController (#19816)

* refactor: use createNewVaultAndRestore from core kc

* test: use createNewVaultAndRestore from core

* refactor: apply @mcmire suggestion

* fix: mnemonic conversion

app/scripts/metamask-controller.js

@@ -89,6 +89,7 @@ import {
   ERC20,
   ERC721,
 } from '@metamask/controller-utils';
+import { wordlist } from '@metamask/scure-bip39/dist/wordlists/english';
 
 ///: BEGIN:ONLY_INCLUDE_IN(build-mmi)
 import { toChecksumHexAddress } from '../../shared/modules/hexstring-utils';
@@ -2905,8 +2906,6 @@ export default class MetamaskController extends EventEmitter {
 
       const seedPhraseAsBuffer = Buffer.from(encodedSeedPhrase);
 
-      const { keyringController } = this;
-
       // clear known identities
       this.preferencesController.setAddresses([]);
 
@@ -2930,29 +2929,22 @@ export default class MetamaskController extends EventEmitter {
       this.txController.txStateManager.clearUnapprovedTxs();
 
       // create new vault
-      const vault = await keyringController.createNewVaultAndRestore(
+      const vault = await this.coreKeyringController.createNewVaultAndRestore(
         password,
-        seedPhraseAsBuffer,
+        this._convertMnemonicToWordlistIndices(seedPhraseAsBuffer),
       );
 
       const ethQuery = new EthQuery(this.provider);
-      accounts = await keyringController.getAccounts();
+      accounts = await this.coreKeyringController.getAccounts();
       lastBalance = await this.getBalance(
         accounts[accounts.length - 1],
         ethQuery,
       );
 
-      const [primaryKeyring] = this.coreKeyringController.getKeyringsByType(
-        KeyringType.hdKeyTree,
-      );
-      if (!primaryKeyring) {
-        throw new Error('MetamaskController - No HD Key Tree found');
-      }
-
       // seek out the first zero balance
       while (lastBalance !== '0x0') {
-        await keyringController.addNewAccount(primaryKeyring);
-        accounts = await keyringController.getAccounts();
+        await this.coreKeyringController.addNewAccount(accounts.length);
+        accounts = await this.coreKeyringController.getAccounts();
         lastBalance = await this.getBalance(
           accounts[accounts.length - 1],
           ethQuery,
@@ -2962,7 +2954,7 @@ export default class MetamaskController extends EventEmitter {
       // remove extra zero balance account potentially created from seeking ahead
       if (accounts.length > 1 && lastBalance === '0x0') {
         await this.removeAccount(accounts[accounts.length - 1]);
-        accounts = await keyringController.getAccounts();
+        accounts = await this.coreKeyringController.getAccounts();
       }
 
       // This must be set as soon as possible to communicate to the
@@ -2973,8 +2965,6 @@ export default class MetamaskController extends EventEmitter {
         this.preferencesController.getLedgerTransportPreference();
       this.setLedgerTransportPreference(transportPreference);
 
-      // set new identities
-      this.preferencesController.setAddresses(accounts);
       this.selectFirstIdentity();
 
       return vault;
@@ -2983,6 +2973,20 @@ export default class MetamaskController extends EventEmitter {
     }
   }
 
+  /**
+   * Encodes a BIP-39 mnemonic as the indices of words in the English BIP-39 wordlist.
+   *
+   * @param {Buffer} mnemonic - The BIP-39 mnemonic.
+   * @returns {Buffer} The Unicode code points for the seed phrase formed from the words in the wordlist.
+   */
+  _convertMnemonicToWordlistIndices(mnemonic) {
+    const indices = mnemonic
+      .toString()
+      .split(' ')
+      .map((word) => wordlist.indexOf(word));
+    return new Uint8Array(new Uint16Array(indices).buffer);
+  }
+
   /**
    * Get an account balance from the AccountTracker or request it directly from the network.
    *

app/scripts/metamask-controller.test.js

@@ -307,7 +307,7 @@ describe('MetaMaskController', function () {
         'createNewVaultAndKeychain',
       );
       sandbox.spy(
-        metamaskController.keyringController,
+        metamaskController.coreKeyringController,
         'createNewVaultAndRestore',
       );
     });
@@ -423,7 +423,7 @@ describe('MetaMaskController', function () {
         await metamaskController.createNewVaultAndRestore(password, TEST_SEED);
 
         assert(
-          metamaskController.keyringController.createNewVaultAndRestore
+          metamaskController.coreKeyringController.createNewVaultAndRestore
             .calledTwice,
         );
       });