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import { SolidityTypes } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import BN = require('bn.js');
import * as ethABI from 'ethereumjs-abi';
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import { Order, SignedOrder } from '../types';
export const utils = {
/**
* Converts BigNumber instance to BN
* The only reason we convert to BN is to remain compatible with `ethABI. soliditySHA3` that
* expects values of Solidity type `uint` to be passed as type `BN`.
* We do not use BN anywhere else in the codebase.
*/
bigNumberToBN(value: BigNumber) {
return new BN(value.toString(), 10);
},
spawnSwitchErr(name: string, value: any): Error {
return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
},
getOrderHashHex(order: Order | SignedOrder): string {
const orderParts = [
{ value: order.exchangeContractAddress, type: SolidityTypes.Address },
{ value: order.maker, type: SolidityTypes.Address },
{ value: order.taker, type: SolidityTypes.Address },
{ value: order.makerTokenAddress, type: SolidityTypes.Address },
{ value: order.takerTokenAddress, type: SolidityTypes.Address },
{ value: order.feeRecipient, type: SolidityTypes.Address },
{
value: utils.bigNumberToBN(order.makerTokenAmount),
type: SolidityTypes.Uint256,
},
{
value: utils.bigNumberToBN(order.takerTokenAmount),
type: SolidityTypes.Uint256,
},
{
value: utils.bigNumberToBN(order.makerFee),
type: SolidityTypes.Uint256,
},
{
value: utils.bigNumberToBN(order.takerFee),
type: SolidityTypes.Uint256,
},
{
value: utils.bigNumberToBN(order.expirationUnixTimestampSec),
type: SolidityTypes.Uint256,
},
{ value: utils.bigNumberToBN(order.salt), type: SolidityTypes.Uint256 },
];
const types = _.map(orderParts, o => o.type);
const values = _.map(orderParts, o => o.value);
const hashBuff = ethABI.soliditySHA3(types, values);
const hashHex = ethUtil.bufferToHex(hashBuff);
return hashHex;
},
getCurrentUnixTimestampSec(): BigNumber {
return new BigNumber(Date.now() / 1000).round();
},
getCurrentUnixTimestampMs(): BigNumber {
return new BigNumber(Date.now());
},
};
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