import { generatePseudoRandomSalt, orderHashUtils } from '@0xproject/order-utils'; import { Order, SignatureType, SignedOrder } from '@0xproject/types'; import { BigNumber } from '@0xproject/utils'; import { constants } from './constants'; import { signingUtils } from './signing_utils'; 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.EthSign, ): SignedOrder { const tenMinutes = 10 * 60 * 1000; const randomExpiration = new BigNumber(Date.now() + tenMinutes); const order = ({ senderAddress: constants.NULL_ADDRESS, expirationTimeSeconds: randomExpiration, salt: generatePseudoRandomSalt(), takerAddress: constants.NULL_ADDRESS, ...this._defaultOrderParams, ...customOrderParams, } as any) as Order; const orderHashBuff = orderHashUtils.getOrderHashBuffer(order); const signature = signingUtils.signMessage(orderHashBuff, this._privateKey, signatureType); const signedOrder = { ...order, signature: `0x${signature.toString('hex')}`, }; return signedOrder; } }