const abi = require('human-standard-token-abi') const Eth = require('ethjs-query') const EthContract = require('ethjs-contract') const tokenInfoGetter = function () { if (typeof global.ethereumProvider === 'undefined') return const eth = new Eth(global.ethereumProvider) const contract = new EthContract(eth) const TokenContract = contract(abi) const tokens = {} return async (address) => { if (tokens[address]) { return tokens[address] } const contract = TokenContract.at(address) const result = await Promise.all([ contract.symbol(), contract.decimals(), ]) const [ symbol = [], decimals = [] ] = result tokens[address] = { symbol: symbol[0], decimals: decimals[0] } return tokens[address] } } function calcTokenAmount (value, decimals) { const multiplier = Math.pow(10, Number(decimals || 0)) const amount = Number(value / multiplier) return amount } module.exports = { tokenInfoGetter, calcTokenAmount, }