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import { crypto, EIP712Schema, 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_EXECUTE_TRANSACTION_SCHEMA: EIP712Schema = {
name: 'ExecuteTransaction',
parameters: [
{ name: 'salt', type: 'uint256' },
{ name: 'signer', type: 'address' },
{ name: 'data', type: 'bytes' },
],
};
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.EthSign): SignedTransaction {
const executeTransactionSchemaHashBuff = EIP712Utils.compileSchema(EIP712_EXECUTE_TRANSACTION_SCHEMA);
const salt = generatePseudoRandomSalt();
const dataHash = crypto.solSHA3([ethUtil.toBuffer(data)]);
const executeTransactionDataHash = crypto.solSHA3([
executeTransactionSchemaHashBuff,
salt,
EIP712Utils.pad32Buffer(this._signerBuff),
dataHash,
]);
const txHash = EIP712Utils.createEIP712Message(executeTransactionDataHash, this._exchangeAddress);
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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