packages/contracts/util/order_factory.ts


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import {ZeroEx} from '0x.js';
import {BigNumber} from 'bignumber.js';
import * as _ from 'lodash';

import {Order} from './order';
import {DefaultOrderParams, OptionalOrderParams, OrderParams} from './types';

export class OrderFactory {
    private defaultOrderParams: DefaultOrderParams;
    constructor(defaultOrderParams: DefaultOrderParams) {
        this.defaultOrderParams = defaultOrderParams;
    }
    public async newSignedOrderAsync(customOrderParams: OptionalOrderParams = {}) {
        const randomExpiration = new BigNumber(Math.floor((Date.now() + (Math.random() * 100000000000)) / 1000));
        const orderParams: OrderParams = _.assign({}, {
            expirationTimestampInSec: randomExpiration,
            salt: ZeroEx.generatePseudoRandomSalt(),
            taker: ZeroEx.NULL_ADDRESS,
        }, this.defaultOrderParams, customOrderParams);
        const order = new Order(orderParams);
        await order.signAsync();
        return order;
    }
}