import * as _ from 'lodash'; 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); }, };