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-rw-r--r--ui/app/util.js45
1 files changed, 45 insertions, 0 deletions
diff --git a/ui/app/util.js b/ui/app/util.js
index 293f4228c..800ccb218 100644
--- a/ui/app/util.js
+++ b/ui/app/util.js
@@ -1,4 +1,16 @@
+const abi = require('human-standard-token-abi')
const ethUtil = require('ethereumjs-util')
+const hexToBn = require('../../app/scripts/lib/hex-to-bn')
+const vreme = new (require('vreme'))()
+
+const MIN_GAS_PRICE_GWEI_BN = new ethUtil.BN(1)
+const GWEI_FACTOR = new ethUtil.BN(1e9)
+const MIN_GAS_PRICE_BN = MIN_GAS_PRICE_GWEI_BN.mul(GWEI_FACTOR)
+
+// formatData :: ( date: <Unix Timestamp> ) -> String
+function formatDate (date) {
+ return vreme.format(new Date(date), 'March 16 2014 14:30')
+}
var valueTable = {
wei: '1000000000000000000',
@@ -36,8 +48,15 @@ module.exports = {
valueTable: valueTable,
bnTable: bnTable,
isHex: isHex,
+ formatDate,
+ bnMultiplyByFraction,
+ getTxFeeBn,
+ shortenBalance,
+ getContractAtAddress,
exportAsFile: exportAsFile,
isInvalidChecksumAddress,
+ allNull,
+ getTokenAddressFromTokenObject,
}
function valuesFor (obj) {
@@ -227,6 +246,24 @@ function isHex (str) {
return Boolean(str.match(/^(0x)?[0-9a-fA-F]+$/))
}
+function bnMultiplyByFraction (targetBN, numerator, denominator) {
+ const numBN = new ethUtil.BN(numerator)
+ const denomBN = new ethUtil.BN(denominator)
+ return targetBN.mul(numBN).div(denomBN)
+}
+
+function getTxFeeBn (gas, gasPrice = MIN_GAS_PRICE_BN.toString(16), blockGasLimit) {
+ const gasBn = hexToBn(gas)
+ const gasPriceBn = hexToBn(gasPrice)
+ const txFeeBn = gasBn.mul(gasPriceBn)
+
+ return txFeeBn.toString(16)
+}
+
+function getContractAtAddress (tokenAddress) {
+ return global.eth.contract(abi).at(tokenAddress)
+}
+
function exportAsFile (filename, data) {
// source: https://stackoverflow.com/a/33542499 by Ludovic Feltz
const blob = new Blob([data], {type: 'text/csv'})
@@ -241,3 +278,11 @@ function exportAsFile (filename, data) {
document.body.removeChild(elem)
}
}
+
+function allNull (obj) {
+ return Object.entries(obj).every(([key, value]) => value === null)
+}
+
+function getTokenAddressFromTokenObject (token) {
+ return Object.values(token)[0].address.toLowerCase()
+}