import { generatePseudoRandomSalt } from '@0xproject/order-utils'; import { SignedOrder, UnsignedOrder } from '@0xproject/types'; import { BigNumber } from '@0xproject/utils'; import * as _ from 'lodash'; import { constants } from './constants'; import { orderUtils } from './order_utils'; import { signingUtils } from './signing_utils'; import { SignatureType } from './types'; export class OrderFactory { private _defaultOrderParams: Partial; private _privateKey: Buffer; constructor(privateKey: Buffer, defaultOrderParams: Partial) { this._defaultOrderParams = defaultOrderParams; this._privateKey = privateKey; } public newSignedOrder( customOrderParams: Partial = {}, signatureType: SignatureType = SignatureType.Ecrecover, ): SignedOrder { const randomExpiration = new BigNumber(Math.floor((Date.now() + Math.random() * 100000000000) / 1000)); const order = ({ senderAddress: constants.NULL_ADDRESS, expirationTimeSeconds: randomExpiration, salt: generatePseudoRandomSalt(), takerAddress: constants.NULL_ADDRESS, ...this._defaultOrderParams, ...customOrderParams, } as any) as UnsignedOrder; const orderHashBuff = orderUtils.getOrderHashBuff(order); const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType); const signedOrder = { ...order, signature: `0x${signature.toString('hex')}`, }; return signedOrder; } }