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import { Order, OrderWithoutExchangeAddress, SignedOrder, UnsignedOrder } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import ethUtil = require('ethereumjs-util');
import * as _ from 'lodash';
import { crypto } from './crypto';
import { EIP712Utils } from './eip712_utils';
import { CancelOrder, EIP712Schema, MatchOrder } from './types';
const EIP712_ORDER_SCHEMA: EIP712Schema = {
name: 'Order',
parameters: [
{ name: 'makerAddress', type: 'address' },
{ name: 'takerAddress', type: 'address' },
{ name: 'feeRecipientAddress', type: 'address' },
{ name: 'senderAddress', type: 'address' },
{ name: 'makerAssetAmount', type: 'uint256' },
{ name: 'takerAssetAmount', type: 'uint256' },
{ name: 'makerFee', type: 'uint256' },
{ name: 'takerFee', type: 'uint256' },
{ name: 'expirationTimeSeconds', type: 'uint256' },
{ name: 'salt', type: 'uint256' },
{ name: 'makerAssetData', type: 'bytes' },
{ name: 'takerAssetData', type: 'bytes' },
],
};
export const orderUtils = {
createFill: (signedOrder: SignedOrder, takerAssetFillAmount?: BigNumber) => {
const fill = {
order: orderUtils.getOrderWithoutExchangeAddress(signedOrder),
takerAssetFillAmount: takerAssetFillAmount || signedOrder.takerAssetAmount,
signature: signedOrder.signature,
};
return fill;
},
createCancel(signedOrder: SignedOrder, takerAssetCancelAmount?: BigNumber): CancelOrder {
const cancel = {
order: orderUtils.getOrderWithoutExchangeAddress(signedOrder),
takerAssetCancelAmount: takerAssetCancelAmount || signedOrder.takerAssetAmount,
};
return cancel;
},
getOrderWithoutExchangeAddress(signedOrder: SignedOrder): OrderWithoutExchangeAddress {
const orderStruct = {
senderAddress: signedOrder.senderAddress,
makerAddress: signedOrder.makerAddress,
takerAddress: signedOrder.takerAddress,
feeRecipientAddress: signedOrder.feeRecipientAddress,
makerAssetAmount: signedOrder.makerAssetAmount,
takerAssetAmount: signedOrder.takerAssetAmount,
makerFee: signedOrder.makerFee,
takerFee: signedOrder.takerFee,
expirationTimeSeconds: signedOrder.expirationTimeSeconds,
salt: signedOrder.salt,
makerAssetData: signedOrder.makerAssetData,
takerAssetData: signedOrder.takerAssetData,
};
return orderStruct;
},
getOrderSchemaBuffer(): Buffer {
return EIP712Utils.compileSchema(EIP712_ORDER_SCHEMA);
},
getOrderHashBuffer(order: SignedOrder | UnsignedOrder): Buffer {
const makerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.makerAssetData)]);
const takerAssetDataHash = crypto.solSHA3([ethUtil.toBuffer(order.takerAssetData)]);
const orderParamsHashBuff = crypto.solSHA3([
orderUtils.getOrderSchemaBuffer(),
EIP712Utils.pad32Address(order.makerAddress),
EIP712Utils.pad32Address(order.takerAddress),
EIP712Utils.pad32Address(order.feeRecipientAddress),
EIP712Utils.pad32Address(order.senderAddress),
order.makerAssetAmount,
order.takerAssetAmount,
order.makerFee,
order.takerFee,
order.expirationTimeSeconds,
order.salt,
makerAssetDataHash,
takerAssetDataHash,
]);
const orderParamsHashHex = `0x${orderParamsHashBuff.toString('hex')}`;
const orderHashBuff = EIP712Utils.createEIP712Message(orderParamsHashHex, order.exchangeAddress);
return orderHashBuff;
},
getOrderHashHex(order: SignedOrder | UnsignedOrder): string {
const orderHashBuff = orderUtils.getOrderHashBuffer(order);
const orderHashHex = `0x${orderHashBuff.toString('hex')}`;
return orderHashHex;
},
createMatchOrders(signedOrderLeft: SignedOrder, signedOrderRight: SignedOrder): MatchOrder {
const fill = {
left: orderUtils.getOrderWithoutExchangeAddress(signedOrderLeft),
right: orderUtils.getOrderWithoutExchangeAddress(signedOrderRight),
leftSignature: signedOrderLeft.signature,
rightSignature: signedOrderRight.signature,
};
return fill;
},
};
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