38 lines
1.4 KiB
TypeScript
38 lines
1.4 KiB
TypeScript
import { generatePseudoRandomSalt, transactionHashUtils } from '@0x/order-utils';
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import { SignatureType, SignedZeroExTransaction } from '@0x/types';
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import * as ethUtil from 'ethereumjs-util';
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import { signingUtils } from './signing_utils';
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export class TransactionFactory {
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private readonly _signerBuff: Buffer;
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private readonly _exchangeAddress: string;
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private readonly _privateKey: Buffer;
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constructor(privateKey: Buffer, exchangeAddress: string) {
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this._privateKey = privateKey;
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this._exchangeAddress = exchangeAddress;
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this._signerBuff = ethUtil.privateToAddress(this._privateKey);
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}
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public newSignedTransaction(
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data: string,
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signatureType: SignatureType = SignatureType.EthSign,
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): SignedZeroExTransaction {
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const salt = generatePseudoRandomSalt();
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const signerAddress = `0x${this._signerBuff.toString('hex')}`;
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const transaction = {
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salt,
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signerAddress,
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data,
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verifyingContractAddress: this._exchangeAddress,
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};
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const transactionHashBuffer = transactionHashUtils.getTransactionHashBuffer(transaction);
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const signature = signingUtils.signMessage(transactionHashBuffer, this._privateKey, signatureType);
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const signedTransaction = {
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...transaction,
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signature: `0x${signature.toString('hex')}`,
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};
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return signedTransaction;
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}
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}
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