1 files changed, 148 insertions, 0 deletions
diff --git a/ui/app/helpers/confirm-transaction/util.js b/ui/app/helpers/confirm-transaction/util.js
new file mode 100644
index 000000000..a37778c19
--- /dev/null
+++ b/ui/app/helpers/confirm-transaction/util.js
@@ -0,0 +1,148 @@
+import currencyFormatter from 'currency-formatter'
+import currencies from 'currency-formatter/currencies'
+import abi from 'human-standard-token-abi'
+import abiDecoder from 'abi-decoder'
+import ethUtil from 'ethereumjs-util'
+import BigNumber from 'bignumber.js'
+
+abiDecoder.addABI(abi)
+
+import MethodRegistry from 'eth-method-registry'
+const registry = new MethodRegistry({ provider: global.ethereumProvider })
+
+import {
+  conversionUtil,
+  addCurrencies,
+  multiplyCurrencies,
+  conversionGreaterThan,
+} from '../../conversion-util'
+
+import { unconfirmedTransactionsCountSelector } from '../../selectors/confirm-transaction'
+
+export function getTokenData (data = {}) {
+  return abiDecoder.decodeMethod(data)
+}
+
+export async function getMethodData (data = {}) {
+  const prefixedData = ethUtil.addHexPrefix(data)
+  const fourBytePrefix = prefixedData.slice(0, 10)
+  const sig = await registry.lookup(fourBytePrefix)
+  const parsedResult = registry.parse(sig)
+
+  return {
+    name: parsedResult.name,
+    params: parsedResult.args,
+  }
+}
+
+export function increaseLastGasPrice (lastGasPrice) {
+  return ethUtil.addHexPrefix(multiplyCurrencies(lastGasPrice, 1.1, {
+    multiplicandBase: 16,
+    multiplierBase: 10,
+    toNumericBase: 'hex',
+  }))
+}
+
+export function hexGreaterThan (a, b) {
+  return conversionGreaterThan(
+    { value: a, fromNumericBase: 'hex' },
+    { value: b, fromNumericBase: 'hex' },
+  )
+}
+
+export function getHexGasTotal ({ gasLimit, gasPrice }) {
+  return ethUtil.addHexPrefix(multiplyCurrencies(gasLimit, gasPrice, {
+    toNumericBase: 'hex',
+    multiplicandBase: 16,
+    multiplierBase: 16,
+  }))
+}
+
+export function addEth (...args) {
+  return args.reduce((acc, base) => {
+    return addCurrencies(acc, base, {
+      toNumericBase: 'dec',
+      numberOfDecimals: 6,
+    })
+  })
+}
+
+export function addFiat (...args) {
+  return args.reduce((acc, base) => {
+    return addCurrencies(acc, base, {
+      toNumericBase: 'dec',
+      numberOfDecimals: 2,
+    })
+  })
+}
+
+export function getTransactionAmount ({
+  value,
+  toCurrency,
+  conversionRate,
+  numberOfDecimals,
+}) {
+  return conversionUtil(value, {
+    fromNumericBase: 'hex',
+    toNumericBase: 'dec',
+    fromCurrency: 'ETH',
+    toCurrency,
+    numberOfDecimals,
+    fromDenomination: 'WEI',
+    conversionRate,
+  })
+}
+
+export function getTransactionFee ({
+  value,
+  toCurrency,
+  conversionRate,
+  numberOfDecimals,
+}) {
+  return conversionUtil(value, {
+    fromNumericBase: 'BN',
+    toNumericBase: 'dec',
+    fromDenomination: 'WEI',
+    fromCurrency: 'ETH',
+    toCurrency,
+    numberOfDecimals,
+    conversionRate,
+  })
+}
+
+export function formatCurrency (value, currencyCode) {
+  const upperCaseCurrencyCode = currencyCode.toUpperCase()
+
+  return currencies.find(currency => currency.code === upperCaseCurrencyCode)
+    ? currencyFormatter.format(Number(value), { code: upperCaseCurrencyCode })
+    : value
+}
+
+export function convertTokenToFiat ({
+  value,
+  toCurrency,
+  conversionRate,
+  contractExchangeRate,
+}) {
+  const totalExchangeRate = conversionRate * contractExchangeRate
+
+  return conversionUtil(value, {
+    fromNumericBase: 'dec',
+    toNumericBase: 'dec',
+    toCurrency,
+    numberOfDecimals: 2,
+    conversionRate: totalExchangeRate,
+  })
+}
+
+export function hasUnconfirmedTransactions (state) {
+  return unconfirmedTransactionsCountSelector(state) > 0
+}
+
+export function roundExponential (value) {
+  const PRECISION = 4
+  const bigNumberValue = new BigNumber(value)
+
+  // In JS, numbers with exponentials greater than 20 get displayed as an exponential.
+  return bigNumberValue.e > 20 ? Number(bigNumberValue.toPrecision(PRECISION)) : value
+}