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import { crypto, generatePseudoRandomSalt } from '@0xproject/order-utils';
import { SignatureType } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import * as ethUtil from 'ethereumjs-util';
import { signingUtils } from './signing_utils';
import { SignedTransaction } from './types';
export class TransactionFactory {
private _signerBuff: Buffer;
private _exchangeAddress: string;
private _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.Ecrecover,
): SignedTransaction {
const salt = generatePseudoRandomSalt();
const txHash = crypto.solSHA3([this._exchangeAddress, this._signerBuff, salt, ethUtil.toBuffer(data)]);
const signature = signingUtils.signMessage(txHash, this._privateKey, signatureType);
const signedTx = {
exchangeAddress: this._exchangeAddress,
salt,
signer: `0x${this._signerBuff.toString('hex')}`,
data,
signature: `0x${signature.toString('hex')}`,
};
return signedTx;
}
}
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