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import map = require('lodash/map');
import includes = require('lodash/includes');
import * as BN from 'bn.js';
import * as ethABI from 'ethereumjs-abi';
import * as ethUtil from 'ethereumjs-util';
import {Order, SignedOrder, SolidityTypes} from '../types';
import * as BigNumber from 'bignumber.js';
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.BigNumber) {
return new BN(value.toString(), 10);
},
consoleLog(message: string): void {
// tslint:disable-next-line: no-console
console.log(message);
},
isParityNode(nodeVersion: string): boolean {
return includes(nodeVersion, 'Parity');
},
isValidOrderHash(orderHashHex: string): boolean {
const isValid = /^0x[0-9A-F]{64}$/i.test(orderHashHex);
return isValid;
},
spawnSwitchErr(name: string, value: any): Error {
return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
},
getOrderHashHex(order: Order|SignedOrder, exchangeContractAddr: string): string {
const orderParts = [
{value: exchangeContractAddr, 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;
},
getCurrentUnixTimestamp(): BigNumber.BigNumber {
return new BigNumber(Date.now() / 1000);
},
};
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