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import { generatePseudoRandomSalt, orderHashUtils } from '@0x/order-utils';
import { Order, SignatureType, SignedOrder } from '@0x/types';
import { BigNumber } from '@0x/utils';
import { getLatestBlockTimestampAsync } from './block_timestamp';
import { constants } from './constants';
import { signingUtils } from './signing_utils';
export class OrderFactory {
private readonly _defaultOrderParams: Partial<Order>;
private readonly _privateKey: Buffer;
constructor(privateKey: Buffer, defaultOrderParams: Partial<Order>) {
this._defaultOrderParams = defaultOrderParams;
this._privateKey = privateKey;
}
public async newSignedOrderAsync(
customOrderParams: Partial<Order> = {},
signatureType: SignatureType = SignatureType.EthSign,
): Promise<SignedOrder> {
const tenMinutesInSeconds = 10 * 60;
const currentBlockTimestamp = await getLatestBlockTimestampAsync();
const order = ({
senderAddress: constants.NULL_ADDRESS,
expirationTimeSeconds: new BigNumber(currentBlockTimestamp).add(tenMinutesInSeconds),
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;
}
}
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