const ethUtil = require('ethereumjs-util') var 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', } var bnTable = {} for (var currency in valueTable) { bnTable[currency] = new ethUtil.BN(valueTable[currency], 10) } module.exports = { valuesFor: valuesFor, addressSummary: addressSummary, miniAddressSummary: miniAddressSummary, isAllOneCase: isAllOneCase, isValidAddress: isValidAddress, numericBalance: numericBalance, parseBalance: parseBalance, formatBalance: formatBalance, generateBalanceObject: generateBalanceObject, dataSize: dataSize, readableDate: readableDate, normalizeToWei: normalizeToWei, normalizeEthStringToWei: normalizeEthStringToWei, normalizeNumberToWei: normalizeNumberToWei, valueTable: valueTable, bnTable: bnTable, isHex: isHex, exportAsFile: exportAsFile, isInvalidChecksumAddress, } function valuesFor (obj) { if (!obj) return [] return Object.keys(obj) .map(function (key) { return obj[key] }) } function addressSummary (address, firstSegLength = 10, lastSegLength = 4, includeHex = true) { if (!address) return '' let checked = ethUtil.toChecksumAddress(address) if (!includeHex) { checked = ethUtil.stripHexPrefix(checked) } return checked ? checked.slice(0, firstSegLength) + '...' + checked.slice(checked.length - lastSegLength) : '...' } function miniAddressSummary (address) { if (!address) return '' var checked = ethUtil.toChecksumAddress(address) return checked ? checked.slice(0, 4) + '...' + checked.slice(-4) : '...' } function isValidAddress (address) { var prefixed = ethUtil.addHexPrefix(address) if (address === '0x0000000000000000000000000000000000000000') return false return (isAllOneCase(prefixed) && ethUtil.isValidAddress(prefixed)) || ethUtil.isValidChecksumAddress(prefixed) } function isInvalidChecksumAddress (address) { var prefixed = ethUtil.addHexPrefix(address) if (address === '0x0000000000000000000000000000000000000000') return false return !isAllOneCase(prefixed) && !ethUtil.isValidChecksumAddress(prefixed) && ethUtil.isValidAddress(prefixed) } function isAllOneCase (address) { if (!address) return true var lower = address.toLowerCase() var upper = address.toUpperCase() return address === lower || address === upper } // Takes wei Hex, returns wei BN, even if input is null function numericBalance (balance) { if (!balance) return new ethUtil.BN(0, 16) var stripped = ethUtil.stripHexPrefix(balance) return new ethUtil.BN(stripped, 16) } // Takes hex, returns [beforeDecimal, afterDecimal] function parseBalance (balance) { var beforeDecimal, afterDecimal const wei = numericBalance(balance) var weiString = wei.toString() const trailingZeros = /0+$/ beforeDecimal = weiString.length > 18 ? weiString.slice(0, weiString.length - 18) : '0' afterDecimal = ('000000000000000000' + wei).slice(-18).replace(trailingZeros, '') if (afterDecimal === '') { afterDecimal = '0' } return [beforeDecimal, afterDecimal] } // Takes wei hex, returns an object with three properties. // Its "formatted" property is what we generally use to render values. function formatBalance (balance, decimalsToKeep, needsParse = true) { var parsed = needsParse ? parseBalance(balance) : balance.split('.') var beforeDecimal = parsed[0] var afterDecimal = parsed[1] var formatted = 'None' if (decimalsToKeep === undefined) { if (beforeDecimal === '0') { if (afterDecimal !== '0') { var sigFigs = afterDecimal.match(/^0*(.{2})/) // default: grabs 2 most significant digits if (sigFigs) { afterDecimal = sigFigs[0] } formatted = '0.' + afterDecimal + ' ETH' } } else { formatted = beforeDecimal + '.' + afterDecimal.slice(0, 3) + ' ETH' } } else { afterDecimal += Array(decimalsToKeep).join('0') formatted = beforeDecimal + '.' + afterDecimal.slice(0, decimalsToKeep) + ' ETH' } return formatted } function generateBalanceObject (formattedBalance, decimalsToKeep = 1) { var balance = formattedBalance.split(' ')[0] var label = formattedBalance.split(' ')[1] var beforeDecimal = balance.split('.')[0] var afterDecimal = balance.split('.')[1] var shortBalance = shortenBalance(balance, decimalsToKeep) if (beforeDecimal === '0' && afterDecimal.substr(0, 5) === '00000') { // eslint-disable-next-line eqeqeq if (afterDecimal == 0) { balance = '0' } else { balance = '<1.0e-5' } } else if (beforeDecimal !== '0') { balance = `${beforeDecimal}.${afterDecimal.slice(0, decimalsToKeep)}` } return { balance, label, shortBalance } } function shortenBalance (balance, decimalsToKeep = 1) { var truncatedValue var convertedBalance = parseFloat(balance) if (convertedBalance > 1000000) { truncatedValue = (balance / 1000000).toFixed(decimalsToKeep) return `${truncatedValue}m` } else if (convertedBalance > 1000) { truncatedValue = (balance / 1000).toFixed(decimalsToKeep) return `${truncatedValue}k` } else if (convertedBalance === 0) { return '0' } else if (convertedBalance < 0.001) { return '<0.001' } else if (convertedBalance < 1) { var stringBalance = convertedBalance.toString() if (stringBalance.split('.')[1].length > 3) { return convertedBalance.toFixed(3) } else { return stringBalance } } else { return convertedBalance.toFixed(decimalsToKeep) } } function dataSize (data) { var size = data ? ethUtil.stripHexPrefix(data).length : 0 return size + ' bytes' } // Takes a BN and an ethereum currency name, // returns a BN in wei function normalizeToWei (amount, currency) { try { return amount.mul(bnTable.wei).div(bnTable[currency]) } catch (e) {} return amount } function normalizeEthStringToWei (str) { const parts = str.split('.') let eth = new ethUtil.BN(parts[0], 10).mul(bnTable.wei) if (parts[1]) { var decimal = parts[1] while (decimal.length < 18) { decimal += '0' } if (decimal.length > 18) { decimal = decimal.slice(0, 18) } const decimalBN = new ethUtil.BN(decimal, 10) eth = eth.add(decimalBN) } return eth } var multiple = new ethUtil.BN('10000', 10) function normalizeNumberToWei (n, currency) { var enlarged = n * 10000 var amount = new ethUtil.BN(String(enlarged), 10) return normalizeToWei(amount, currency).div(multiple) } function readableDate (ms) { var date = new Date(ms) var month = date.getMonth() var day = date.getDate() var year = date.getFullYear() var hours = date.getHours() var minutes = '0' + date.getMinutes() var seconds = '0' + date.getSeconds() var dateStr = `${month}/${day}/${year}` var time = `${hours}:${minutes.substr(-2)}:${seconds.substr(-2)}` return `${dateStr} ${time}` } function isHex (str) { return Boolean(str.match(/^(0x)?[0-9a-fA-F]+$/)) } function exportAsFile (filename, data) { // source: https://stackoverflow.com/a/33542499 by Ludovic Feltz const blob = new Blob([data], {type: 'text/csv'}) if (window.navigator.msSaveOrOpenBlob) { window.navigator.msSaveBlob(blob, filename) } else { const elem = window.document.createElement('a') elem.href = window.URL.createObjectURL(blob) elem.download = filename document.body.appendChild(elem) elem.click() document.body.removeChild(elem) } }