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import { EIP712Schema, EIP712Types, EIP712Utils, generatePseudoRandomSalt } from '@0xproject/order-utils';
import { SignatureType } from '@0xproject/types';
import * as ethUtil from 'ethereumjs-util';
import { signingUtils } from './signing_utils';
import { SignedTransaction } from './types';
const EIP712_ZEROEX_TRANSACTION_SCHEMA: EIP712Schema = {
name: 'ZeroExTransaction',
parameters: [
{ name: 'salt', type: EIP712Types.Uint256 },
{ name: 'signerAddress', type: EIP712Types.Address },
{ name: 'data', type: EIP712Types.Bytes },
],
};
export class TransactionFactory {
private readonly _signerBuff: Buffer;
private readonly _exchangeAddress: string;
private readonly _privateKey: Buffer;
constructor(privateKey: Buffer, exchangeAddress: string) {
this._privateKey = privateKey;
this._exchangeAddress = exchangeAddress;
this._signerBuff = ethUtil.privateToAddress(this._privateKey);
}
public newSignedTransaction(data: string, signatureType: SignatureType = SignatureType.EthSign): SignedTransaction {
const salt = generatePseudoRandomSalt();
const signerAddress = `0x${this._signerBuff.toString('hex')}`;
const executeTransactionData = {
salt,
signerAddress,
data,
};
const executeTransactionHashBuff = EIP712Utils.structHash(
EIP712_ZEROEX_TRANSACTION_SCHEMA,
executeTransactionData,
);
const txHash = EIP712Utils.createEIP712Message(executeTransactionHashBuff, this._exchangeAddress);
const signature = signingUtils.signMessage(txHash, this._privateKey, signatureType);
const signedTx = {
exchangeAddress: this._exchangeAddress,
signature: `0x${signature.toString('hex')}`,
...executeTransactionData,
};
return signedTx;
}
}
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