import abi from 'human-standard-token-abi' import ethUtil from 'ethereumjs-util' import { DateTime } from 'luxon' // formatData :: ( date: ) -> String export function formatDate (date, format = 'M/d/y \'at\' T') { return DateTime.fromMillis(date).toFormat(format) } const valueTable = { wei: '1000000000000000000', kwei: '1000000000000000', mwei: '1000000000000', gwei: '1000000000', szabo: '1000000', finney: '1000', ether: '1', kether: '0.001', mether: '0.000001', gether: '0.000000001', tether: '0.000000000001', } const bnTable = {} for (const currency in valueTable) { bnTable[currency] = new ethUtil.BN(valueTable[currency], 10) } export function isEthNetwork (netId) { if (!netId || netId === '1' || netId === '3' || netId === '4' || netId === '42' || netId === '5777') { return true } return false } export function valuesFor (obj) { if (!obj) { return [] } return Object.keys(obj) .map(function (key) { return obj[key] }) } export function addressSummary (address, firstSegLength = 10, lastSegLength = 4, includeHex = true) { if (!address) { return '' } let checked = checksumAddress(address) if (!includeHex) { checked = ethUtil.stripHexPrefix(checked) } return checked ? checked.slice(0, firstSegLength) + '...' + checked.slice(checked.length - lastSegLength) : '...' } export function isValidAddress (address) { const prefixed = ethUtil.addHexPrefix(address) if (address === '0x0000000000000000000000000000000000000000') { return false } return (isAllOneCase(prefixed) && ethUtil.isValidAddress(prefixed)) || ethUtil.isValidChecksumAddress(prefixed) } export function isValidENSAddress (address) { return address.match(/^.{3,}\.(eth|test|xyz)$/) } export function isAllOneCase (address) { if (!address) { return true } const lower = address.toLowerCase() const upper = address.toUpperCase() return address === lower || address === upper } // Takes wei Hex, returns wei BN, even if input is null export function numericBalance (balance) { if (!balance) { return new ethUtil.BN(0, 16) } const stripped = ethUtil.stripHexPrefix(balance) return new ethUtil.BN(stripped, 16) } // Takes hex, returns [beforeDecimal, afterDecimal] export function parseBalance (balance) { let afterDecimal const wei = numericBalance(balance) const weiString = wei.toString() const trailingZeros = /0+$/ const beforeDecimal = weiString.length > 18 ? weiString.slice(0, weiString.length - 18) : '0' afterDecimal = ('000000000000000000' + wei).slice(-18).replace(trailingZeros, '') if (afterDecimal === '') { afterDecimal = '0' } return [beforeDecimal, afterDecimal] } // Takes wei hex, returns an object with three properties. // Its "formatted" property is what we generally use to render values. export function formatBalance (balance, decimalsToKeep, needsParse = true, ticker = 'ETH') { const parsed = needsParse ? parseBalance(balance) : balance.split('.') const beforeDecimal = parsed[0] let afterDecimal = parsed[1] let formatted = 'None' if (decimalsToKeep === undefined) { if (beforeDecimal === '0') { if (afterDecimal !== '0') { const sigFigs = afterDecimal.match(/^0*(.{2})/) // default: grabs 2 most significant digits if (sigFigs) { afterDecimal = sigFigs[0] } formatted = '0.' + afterDecimal + ` ${ticker}` } } else { formatted = beforeDecimal + '.' + afterDecimal.slice(0, 3) + ` ${ticker}` } } else { afterDecimal += Array(decimalsToKeep).join('0') formatted = beforeDecimal + '.' + afterDecimal.slice(0, decimalsToKeep) + ` ${ticker}` } return formatted } export function generateBalanceObject (formattedBalance, decimalsToKeep = 1) { let balance = formattedBalance.split(' ')[0] const label = formattedBalance.split(' ')[1] const beforeDecimal = balance.split('.')[0] const afterDecimal = balance.split('.')[1] const shortBalance = shortenBalance(balance, decimalsToKeep) if (beforeDecimal === '0' && afterDecimal.substr(0, 5) === '00000') { // eslint-disable-next-line eqeqeq if (afterDecimal == 0) { balance = '0' } else { balance = '<1.0e-5' } } else if (beforeDecimal !== '0') { balance = `${beforeDecimal}.${afterDecimal.slice(0, decimalsToKeep)}` } return { balance, label, shortBalance } } export function shortenBalance (balance, decimalsToKeep = 1) { let truncatedValue const convertedBalance = parseFloat(balance) if (convertedBalance > 1000000) { truncatedValue = (balance / 1000000).toFixed(decimalsToKeep) return `${truncatedValue}m` } else if (convertedBalance > 1000) { truncatedValue = (balance / 1000).toFixed(decimalsToKeep) return `${truncatedValue}k` } else if (convertedBalance === 0) { return '0' } else if (convertedBalance < 0.001) { return '<0.001' } else if (convertedBalance < 1) { const stringBalance = convertedBalance.toString() if (stringBalance.split('.')[1].length > 3) { return convertedBalance.toFixed(3) } else { return stringBalance } } else { return convertedBalance.toFixed(decimalsToKeep) } } // Takes a BN and an ethereum currency name, // returns a BN in wei export function normalizeToWei (amount, currency) { try { return amount.mul(bnTable.wei).div(bnTable[currency]) } catch (e) {} return amount } export function normalizeEthStringToWei (str) { const parts = str.split('.') let eth = new ethUtil.BN(parts[0], 10).mul(bnTable.wei) if (parts[1]) { let decimal = parts[1] while (decimal.length < 18) { decimal += '0' } if (decimal.length > 18) { decimal = decimal.slice(0, 18) } const decimalBN = new ethUtil.BN(decimal, 10) eth = eth.add(decimalBN) } return eth } const multiple = new ethUtil.BN('10000', 10) export function normalizeNumberToWei (n, currency) { const enlarged = n * 10000 const amount = new ethUtil.BN(String(enlarged), 10) return normalizeToWei(amount, currency).div(multiple) } export function isHex (str) { return Boolean(str.match(/^(0x)?[0-9a-fA-F]+$/)) } export function getContractAtAddress (tokenAddress) { return global.eth.contract(abi).at(tokenAddress) } export function exportAsFile (filename, data, type = 'text/csv') { // source: https://stackoverflow.com/a/33542499 by Ludovic Feltz const blob = new Blob([data], { type }) if (window.navigator.msSaveOrOpenBlob) { window.navigator.msSaveBlob(blob, filename) } else { const elem = window.document.createElement('a') elem.target = '_blank' elem.href = window.URL.createObjectURL(blob) elem.download = filename document.body.appendChild(elem) elem.click() document.body.removeChild(elem) } } export function getTokenAddressFromTokenObject (token) { return Object.values(token)[0].address.toLowerCase() } /** * Safely checksumms a potentially-null address * * @param {String} [address] - address to checksum * @returns {String} - checksummed address * */ export function checksumAddress (address) { const checksummed = address ? ethUtil.toChecksumAddress(address) : '' return checksummed } export function addressSlicer (address = '') { if (address.length < 11) { return address } return `${address.slice(0, 6)}...${address.slice(-4)}` } export function isValidAddressHead (address) { const addressLengthIsLessThanFull = address.length < 42 const addressIsHex = isHex(address) return addressLengthIsLessThanFull && addressIsHex } export function getOriginFromUrl (url) { url = new URL(url) const origin = url.hostname return origin }