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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,
isAllOneCase: isAllOneCase,
isValidAddress: isValidAddress,
numericBalance: numericBalance,
parseBalance: parseBalance,
formatBalance: formatBalance,
dataSize: dataSize,
readableDate: readableDate,
ethToWei: ethToWei,
weiToEth: weiToEth,
normalizeToWei: normalizeToWei,
normalizeNumberToWei: normalizeNumberToWei,
valueTable: valueTable,
bnTable: bnTable,
}
function valuesFor(obj) {
if (!obj) return []
return Object.keys(obj)
.map(function(key){ return obj[key] })
}
function addressSummary(address) {
var checked = ethUtil.toChecksumAddress(address)
return checked ? checked.slice(0,2+8)+'...'+checked.slice(-4) : '...'
}
function isValidAddress(address) {
var prefixed = ethUtil.addHexPrefix(address)
return isAllOneCase(prefixed) && ethUtil.isValidAddress(prefixed) || ethUtil.isValidChecksumAddress(prefixed)
}
function isAllOneCase(address) {
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 eth BN, returns BN wei
function ethToWei(bn) {
var eth = new ethUtil.BN('1000000000000000000')
var wei = bn.mul(eth)
return wei
}
// Takes BN in Wei, returns BN in eth
function weiToEth(bn) {
var diff = new ethUtil.BN('1000000000000000000')
var eth = bn.div(diff)
return eth
}
// Takes hex, returns [beforeDecimal, afterDecimal]
function parseBalance(balance, decimalsToKeep) {
if (decimalsToKeep === undefined) decimalsToKeep = 4
if (!balance || balance === '0x0') return ['0', '']
var wei = numericBalance(balance)
var padded = wei.toString(10)
var len = padded.length
var match = padded.match(/[^0]/)
var nonZeroIndex = match && match.index
var beforeDecimal = padded.substr(nonZeroIndex ? nonZeroIndex : 0, len - 18) || '0'
var afterDecimal = padded.substr(len - 18, decimalsToKeep)
return [beforeDecimal, afterDecimal]
}
// Takes wei hex, returns "None" or "${formattedAmount} ETH"
function formatBalance(balance) {
var parsed = parseBalance(balance)
var beforeDecimal = parsed[0]
var afterDecimal = parsed[1]
if (beforeDecimal === '0' && afterDecimal === '') return 'None'
var result = beforeDecimal
if (afterDecimal) result += '.'+afterDecimal
result += ' ETH'
return result
}
function dataSize(data) {
var size = data ? ethUtil.stripHexPrefix(data).length : 0
return size+' bytes'
}
// Takes a BN and an ethereum currency name,
// returns a BN in wei
function normalizeToWei(amount, currency) {
try {
return amount.mul(bnTable.wei).div(bnTable[currency])
} catch (e) {}
return amount
}
var multiple = new ethUtil.BN('10000', 10)
function normalizeNumberToWei(n, currency) {
var enlarged = n * 10000
var amount = new ethUtil.BN(String(enlarged), 10)
return normalizeToWei(amount, currency).div(multiple)
}
function readableDate(ms) {
var date = new Date(ms)
var month = date.getMonth()
var day = date.getDate()
var year = date.getFullYear()
var hours = date.getHours()
var minutes = "0" + date.getMinutes()
var seconds = "0" + date.getSeconds()
var date = `${month}/${day}/${year}`
var time = `${hours}:${minutes.substr(-2)}:${seconds.substr(-2)}`
return `${date} ${time}`
}
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