58 lines
2.2 KiB
TypeScript
58 lines
2.2 KiB
TypeScript
import { crypto, generatePseudoRandomSalt } from '@0xproject/order-utils';
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import { SignatureType } from '@0xproject/types';
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import { BigNumber } from '@0xproject/utils';
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import * as ethUtil from 'ethereumjs-util';
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import * as _ from 'lodash';
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import { crypto } from './crypto';
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import { EIP712Utils } from './eip712_utils';
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import { orderUtils } from './order_utils';
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import { signingUtils } from './signing_utils';
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import { EIP712Schema, SignatureType, SignedTransaction } from './types';
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const EIP712_EXECUTE_TRANSACTION_SCHEMA: EIP712Schema = {
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name: 'ExecuteTransaction',
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parameters: [
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{ name: 'salt', type: 'uint256' },
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{ name: 'signer', type: 'address' },
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{ name: 'data', type: '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 executeTransactionSchemaHashBuff = EIP712Utils.compileSchema(EIP712_EXECUTE_TRANSACTION_SCHEMA);
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const salt = generatePseudoRandomSalt();
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const dataHash = crypto.solSHA3([ethUtil.toBuffer(data)]);
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const executeTransactionDataHash = crypto.solSHA3([
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executeTransactionSchemaHashBuff,
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salt,
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EIP712Utils.pad32Buffer(this._signerBuff),
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dataHash,
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]);
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const executeTransactionMessageHex = `0x${executeTransactionDataHash.toString('hex')}`;
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const txHash = EIP712Utils.createEIP712Message(executeTransactionMessageHex, this._exchangeAddress);
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const signature = signingUtils.signMessage(txHash, this._privateKey, signatureType);
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const signedTx = {
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exchangeAddress: this._exchangeAddress,
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salt,
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signer: `0x${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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