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import { generatePseudoRandomSalt } from '@0xproject/order-utils';
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, SignedOrder, UnsignedOrder } from './types';
export class OrderFactory {
private _defaultOrderParams: Partial<UnsignedOrder>;
private _privateKey: Buffer;
constructor(privateKey: Buffer, defaultOrderParams: Partial<UnsignedOrder>) {
this._defaultOrderParams = defaultOrderParams;
this._privateKey = privateKey;
}
public newSignedOrder(
customOrderParams: Partial<UnsignedOrder> = {},
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;
}
}
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