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' abiDecoder.addABI(abi) import MethodRegistry from 'eth-method-registry' const registry = new MethodRegistry({ provider: global.ethereumProvider }) import { conversionUtil, addCurrencies, multiplyCurrencies, conversionGreaterThan, } from '../../conversion-util' 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, }) }