67 lines
2.9 KiB
TypeScript
67 lines
2.9 KiB
TypeScript
import { generatePseudoRandomSalt } from '@0x/order-utils';
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import { crypto } from '@0x/order-utils/lib/src/crypto';
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import { OrderWithoutDomain, SignedOrder } from '@0x/types';
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import { BigNumber } from '@0x/utils';
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import * as _ from 'lodash';
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import { constants } from './constants';
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import { BatchMatchOrder, CancelOrder, MatchOrder } from './types';
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export const orderUtils = {
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getPartialAmountFloor(numerator: BigNumber, denominator: BigNumber, target: BigNumber): BigNumber {
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const partialAmount = numerator
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.multipliedBy(target)
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.div(denominator)
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.integerValue(BigNumber.ROUND_FLOOR);
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return partialAmount;
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},
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createFill: (signedOrder: SignedOrder, takerAssetFillAmount?: BigNumber) => {
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const fill = {
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order: orderUtils.getOrderWithoutDomain(signedOrder),
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takerAssetFillAmount: takerAssetFillAmount || signedOrder.takerAssetAmount,
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signature: signedOrder.signature,
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};
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return fill;
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},
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createCancel(signedOrder: SignedOrder, takerAssetCancelAmount?: BigNumber): CancelOrder {
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const cancel = {
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order: orderUtils.getOrderWithoutDomain(signedOrder),
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takerAssetCancelAmount: takerAssetCancelAmount || signedOrder.takerAssetAmount,
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};
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return cancel;
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},
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getOrderWithoutDomain(signedOrder: SignedOrder): OrderWithoutDomain {
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return _.omit(signedOrder, ['signature', 'exchangeAddress', 'chainId']) as OrderWithoutDomain;
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},
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createBatchMatchOrders(signedOrdersLeft: SignedOrder[], signedOrdersRight: SignedOrder[]): BatchMatchOrder {
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return {
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leftOrders: signedOrdersLeft.map(order => orderUtils.getOrderWithoutDomain(order)),
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rightOrders: signedOrdersRight.map(order => {
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const right = orderUtils.getOrderWithoutDomain(order);
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right.makerAssetData = constants.NULL_BYTES;
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right.takerAssetData = constants.NULL_BYTES;
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return right;
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}),
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leftSignatures: signedOrdersLeft.map(order => order.signature),
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rightSignatures: signedOrdersRight.map(order => order.signature),
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};
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},
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createMatchOrders(signedOrderLeft: SignedOrder, signedOrderRight: SignedOrder): MatchOrder {
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const fill = {
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left: orderUtils.getOrderWithoutDomain(signedOrderLeft),
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right: orderUtils.getOrderWithoutDomain(signedOrderRight),
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leftSignature: signedOrderLeft.signature,
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rightSignature: signedOrderRight.signature,
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};
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fill.right.makerAssetData = constants.NULL_BYTES;
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fill.right.takerAssetData = constants.NULL_BYTES;
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return fill;
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},
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generatePseudoRandomOrderHash(): string {
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const randomBigNum = generatePseudoRandomSalt();
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const randomBuff = crypto.solSHA3([randomBigNum]);
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const randomHash = `0x${randomBuff.toString('hex')}`;
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return randomHash;
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},
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};
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