38 lines
1.5 KiB
TypeScript
38 lines
1.5 KiB
TypeScript
import { eip712Utils, generatePseudoRandomSalt } from '@0x/order-utils';
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import { SignatureType } from '@0x/types';
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import { signTypedDataUtils } from '@0x/utils';
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import * as ethUtil from 'ethereumjs-util';
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import { signingUtils } from './signing_utils';
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import { SignedTransaction } from './types';
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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(data: string, signatureType: SignatureType = SignatureType.EthSign): SignedTransaction {
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const salt = generatePseudoRandomSalt();
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const signerAddress = `0x${this._signerBuff.toString('hex')}`;
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const executeTransactionData = {
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salt,
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signerAddress,
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data,
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};
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const typedData = eip712Utils.createZeroExTransactionTypedData(executeTransactionData, this._exchangeAddress);
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const eip712MessageBuffer = signTypedDataUtils.generateTypedDataHash(typedData);
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const signature = signingUtils.signMessage(eip712MessageBuffer, this._privateKey, signatureType);
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const signedTx = {
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exchangeAddress: this._exchangeAddress,
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signature: `0x${signature.toString('hex')}`,
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...executeTransactionData,
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};
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return signedTx;
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}
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}
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