48 lines
1.8 KiB
TypeScript
48 lines
1.8 KiB
TypeScript
import { EIP712Schema, EIP712Types, EIP712Utils, generatePseudoRandomSalt } from '@0xproject/order-utils';
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import { SignatureType } from '@0xproject/types';
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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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const EIP712_ZEROEX_TRANSACTION_SCHEMA: EIP712Schema = {
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name: 'ZeroExTransaction',
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parameters: [
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{ name: 'salt', type: EIP712Types.Uint256 },
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{ name: 'signerAddress', type: EIP712Types.Address },
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{ name: 'data', type: EIP712Types.Bytes },
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],
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};
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export class TransactionFactory {
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private _signerBuff: Buffer;
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private _exchangeAddress: string;
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private _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${this._signerBuff.toString('hex')}`;
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const executeTransactionData = {
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salt,
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signerAddress,
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data,
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};
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const executeTransactionHashBuff = EIP712Utils.structHash(
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EIP712_ZEROEX_TRANSACTION_SCHEMA,
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executeTransactionData,
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);
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const txHash = EIP712Utils.createEIP712Message(executeTransactionHashBuff, this._exchangeAddress);
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const signature = signingUtils.signMessage(txHash, this._privateKey, signatureType);
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const signedTx = {
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exchangeAddress: this._exchangeAddress,
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signature: `0x${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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