31 lines
1.3 KiB
TypeScript
31 lines
1.3 KiB
TypeScript
import { crypto, 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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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 txHash = crypto.solSHA3([this._exchangeAddress, this._signerBuff, salt, ethUtil.toBuffer(data)]);
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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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salt,
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signer: `0x${this._signerBuff.toString('hex')}`,
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data,
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signature: `0x${signature.toString('hex')}`,
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};
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return signedTx;
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}
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}
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