feat: add approveToken function for erc20 sendMany

TICKET: COIN-2785

Author: kamleshmugdiya

examples/ts/eth/approve-erc20token.ts

@@ -0,0 +1,51 @@
+/**
+ * Approve an ERC20 token for use with a batcher contract at BitGo.
+ *
+ * Copyright 2023, BitGo, Inc.  All Rights Reserved.
+ */
+import { BitGoAPI } from '@bitgo/sdk-api';
+import { Topeth } from '@bitgo/sdk-coin-opeth';
+require('dotenv').config({ path: '../../../.env' });
+
+const bitgo = new BitGoAPI({
+  accessToken: process.env.TESTNET_ACCESS_TOKEN,
+  env: 'test',
+});
+
+const coin = 'topeth';
+bitgo.register(coin, Topeth.createInstance);
+
+const walletId = process.env.TESTNET_ETH_WALLET_ID;
+const walletPassphrase = process.env.TESTNET_ETH_WALLET_PASSPHRASE;
+const tokenName = 'topeth:terc18dp'; // Replace with the token you want to approve
+
+async function main() {
+  if (!walletId) {
+    throw new Error('Please set TESTNET_ETH_WALLET_ID environment variable');
+  }
+  if (!walletPassphrase) {
+    throw new Error('Please set TESTNET_ETH_WALLET_PASSPHRASE environment variable');
+  }
+
+  const walletInstance = await bitgo.coin(coin).wallets().get({ id: walletId });
+
+  console.log('Wallet ID:', walletInstance.id());
+  console.log('Current Receive Address:', walletInstance.receiveAddress());
+
+  console.log(`Approving token ${tokenName} for use with batcher contract...`);
+
+  try {
+    const approvalTransaction = await walletInstance.approveErc20Token(walletPassphrase, tokenName);
+
+    console.log('Token Approval Transaction:', JSON.stringify(approvalTransaction, null, 4));
+    console.log('Transaction ID:', approvalTransaction.txid);
+    console.log('Status:', approvalTransaction.status);
+  } catch (e) {
+    console.error('Error approving token:', e.message);
+    if (e.stack) {
+      console.error(e.stack);
+    }
+  }
+}
+
+main().catch((e) => console.error(e));

modules/bitgo/test/v2/unit/wallet.ts

@@ -4681,4 +4681,169 @@ describe('V2 Wallet:', function () {
       await adaWallet.sendMany(sendManyParams).should.be.resolved();
     });
   });
+
+  describe('ERC20 Token Approval', function () {
+    let wallet;
+    const walletId = '5b34252f1bf349930e34020a00000000';
+    let topethCoin;
+    const tokenName = 'topeth:terc18dp';
+    const coin = 'topeth';
+
+    beforeEach(function () {
+      topethCoin = bitgo.coin('topeth');
+      wallet = new Wallet(bitgo, topethCoin, {
+        id: walletId,
+        coin: coin,
+        keys: ['keyid1', 'keyid2', 'keyid3'],
+      });
+    });
+
+    afterEach(function () {
+      sinon.restore();
+    });
+
+    it('should successfully approve a token', async function () {
+      const walletPassphrase = 'password123';
+      const expectedApprovalBuild = {
+        txHex: '0x123456',
+        feeInfo: {
+          fee: '1000000000',
+        },
+      };
+
+      const expectedSignedTx = {
+        txHex: '0x123456signed',
+      };
+
+      const expectedSendResult = {
+        txid: '0xabcdef',
+        tx: '0x123456signed',
+        status: 'signed',
+      };
+
+      // Mock the token approval build API
+      const ethUrl = common.Environments[bitgo.getEnv()].uri;
+      nock(ethUrl).post(`/api/v2/${coin}/wallet/${walletId}/token/approval/build`).reply(200, expectedApprovalBuild);
+
+      // Mock the getKeychainsAndValidatePassphrase method
+      sinon.stub(wallet, 'getKeychainsAndValidatePassphrase').resolves([
+        {
+          id: 'keyid1',
+          pub: 'pub1',
+          encryptedPrv: 'encryptedPrv',
+        },
+      ]);
+
+      // Mock the sign transaction method
+      sinon.stub(wallet, 'signTransaction').resolves(expectedSignedTx);
+
+      // Mock the send transaction method
+      sinon.stub(wallet, 'sendTransaction').resolves(expectedSendResult);
+
+      const result = await wallet.approveErc20Token(walletPassphrase, tokenName);
+
+      should.exist(result);
+      result.should.deepEqual(expectedSendResult);
+
+      // Verify the parameters passed to signTransaction
+      const signParams = wallet.signTransaction.firstCall.args[0];
+      signParams.should.have.property('txPrebuild', expectedApprovalBuild);
+      signParams.should.have.property('keychain');
+      signParams.should.have.property('walletPassphrase', walletPassphrase);
+    });
+
+    it('should handle token approval build API errors', async function () {
+      const walletPassphrase = 'password123';
+      const errorMessage = 'token approval build failed';
+
+      // Mock the token approval build API to return an error
+      nock(bgUrl).post(`/api/v2/${coin}/wallet/${walletId}/token/approval/build`).replyWithError(errorMessage);
+
+      await wallet.approveErc20Token(walletPassphrase, tokenName).should.be.rejectedWith(errorMessage);
+    });
+
+    it('should handle wallet passphrase validation errors', async function () {
+      const walletPassphrase = 'wrong-password';
+      const expectedApprovalBuild = {
+        txHex: '0x123456',
+        feeInfo: {
+          fee: '1000000000',
+        },
+      };
+
+      // Mock the token approval build API
+      nock(bgUrl).post(`/api/v2/${coin}/wallet/${walletId}/token/approval/build`).reply(200, expectedApprovalBuild);
+
+      // Mock the getKeychainsAndValidatePassphrase method to throw an error
+      const error = new Error('unable to decrypt keychain with the given wallet passphrase');
+      error.name = 'wallet_passphrase_incorrect';
+      sinon.stub(wallet, 'getKeychainsAndValidatePassphrase').rejects(error);
+
+      await wallet
+        .approveErc20Token(walletPassphrase, tokenName)
+        .should.be.rejectedWith('unable to decrypt keychain with the given wallet passphrase');
+    });
+
+    it('should handle signing errors', async function () {
+      const walletPassphrase = 'password123';
+      const expectedApprovalBuild = {
+        txHex: '0x123456',
+        feeInfo: {
+          fee: '1000000000',
+        },
+      };
+      const signingError = new Error('signing failed');
+
+      // Mock the token approval build API
+      nock(bgUrl).post(`/api/v2/${coin}/wallet/${walletId}/token/approval/build`).reply(200, expectedApprovalBuild);
+
+      // Mock the getKeychainsAndValidatePassphrase method
+      sinon.stub(wallet, 'getKeychainsAndValidatePassphrase').resolves([
+        {
+          id: 'keyid1',
+          pub: 'pub1',
+          encryptedPrv: 'encryptedPrv',
+        },
+      ]);
+
+      // Mock the sign transaction method to throw an error
+      sinon.stub(wallet, 'signTransaction').rejects(signingError);
+
+      await wallet.approveErc20Token(walletPassphrase, tokenName).should.be.rejectedWith(signingError);
+    });
+
+    it('should handle send transaction errors', async function () {
+      const walletPassphrase = 'password123';
+      const expectedApprovalBuild = {
+        txHex: '0x123456',
+        feeInfo: {
+          fee: '1000000000',
+        },
+      };
+      const expectedSignedTx = {
+        txHex: '0x123456signed',
+      };
+      const sendError = new Error('send failed');
+
+      // Mock the token approval build API
+      nock(bgUrl).post(`/api/v2/${coin}/wallet/${walletId}/token/approval/build`).reply(200, expectedApprovalBuild);
+
+      // Mock the getKeychainsAndValidatePassphrase method
+      sinon.stub(wallet, 'getKeychainsAndValidatePassphrase').resolves([
+        {
+          id: 'keyid1',
+          pub: 'pub1',
+          encryptedPrv: 'encryptedPrv',
+        },
+      ]);
+
+      // Mock the sign transaction method
+      sinon.stub(wallet, 'signTransaction').resolves(expectedSignedTx);
+
+      // Mock the send transaction method to throw an error
+      sinon.stub(wallet, 'sendTransaction').rejects(sendError);
+
+      await wallet.approveErc20Token(walletPassphrase, tokenName).should.be.rejectedWith(sendError);
+    });
+  });
 });

modules/sdk-core/src/bitgo/wallet/iWallet.ts

@@ -31,6 +31,7 @@ import {
 import { SerializedNtilde } from '../../account-lib/mpc/tss/ecdsa/types';
 import { IAddressBook } from '../address-book';
 import { WalletUser } from '@bitgo/public-types';
+import { SubmitTransactionResponse } from '../inscriptionBuilder';
 
 export interface MaximumSpendableOptions {
   minValue?: number | string;
@@ -899,4 +900,5 @@ export interface IWallet {
   fetchCrossChainUTXOs(params: FetchCrossChainUTXOsOptions): Promise<CrossChainUTXO[]>;
   getChallengesForEcdsaSigning(): Promise<WalletEcdsaChallenges>;
   getNftBalances(): Promise<NftBalance[]>;
+  approveErc20Token(walletPassphrase: string, tokenName: string): Promise<SubmitTransactionResponse>;
 }

modules/sdk-core/src/bitgo/wallet/wallet.ts

@@ -112,6 +112,7 @@ import { AddressBook, IAddressBook } from '../address-book';
 import { IRequestTracer } from '../../api';
 import { getTxRequestApiVersion, validateTxRequestApiVersion } from '../utils/txRequest';
 import { getLightningAuthKey } from '../lightning/lightningWalletUtil';
+import { SubmitTransactionResponse } from '../inscriptionBuilder';
 
 const debug = require('debug')('bitgo:v2:wallet');
 
@@ -3739,4 +3740,47 @@ export class Wallet implements IWallet {
     }
     return keychains;
   }
+
+  /**
+   * Approve token for use with a batcher contract
+   * This function builds, signs, and sends a token approval transaction
+   *
+   * @param {string} walletPassphrase - The passphrase to be used to decrypt the user key
+   * @param {string} tokenName - The name of the token to be approved
+   * @returns {Promise<any>} The transaction details
+   */
+  async approveErc20Token(walletPassphrase: string, tokenName: string): Promise<SubmitTransactionResponse> {
+    const reqId = new RequestTracer();
+    this.bitgo.setRequestTracer(reqId);
+
+    let tokenApprovalBuild;
+    try {
+      const url = this.baseCoin.url(`/wallet/${this.id()}/token/approval/build`);
+      tokenApprovalBuild = await this.bitgo
+        .post(url)
+        .send({
+          tokenName: tokenName,
+        })
+        .result();
+    } catch (e) {
+      throw e;
+    }
+
+    const keychains = await this.getKeychainsAndValidatePassphrase({
+      reqId,
+      walletPassphrase,
+    });
+
+    const signingParams = {
+      txPrebuild: tokenApprovalBuild,
+      keychain: keychains[0],
+      walletPassphrase,
+      reqId,
+    };
+
+    const halfSignedTransaction = await this.signTransaction(signingParams);
+    const finalTxParams = _.extend({}, halfSignedTransaction);
+
+    return this.sendTransaction(finalTxParams, reqId);
+  }
 }