const inherits = require('util').inherits const Component = require('react').Component const h = require('react-hyperscript') const connect = require('react-redux').connect const actions = require('./actions') const ethUtil = require('ethereumjs-util') const abi = require('human-standard-token-abi') const Eth = require('ethjs-query') const EthContract = require('ethjs-contract') const emptyAddr = '0x0000000000000000000000000000000000000000' module.exports = connect(mapStateToProps)(AddTokenScreen) function mapStateToProps (state) { return { } } inherits(AddTokenScreen, Component) function AddTokenScreen () { this.state = { warning: null, address: null, symbol: 'TOKEN', decimals: 18, } Component.call(this) } AddTokenScreen.prototype.render = function () { const state = this.state const props = this.props const { warning, symbol, decimals } = state return ( h('.flex-column.flex-grow', [ // subtitle and nav h('.section-title.flex-row.flex-center', [ h('i.fa.fa-arrow-left.fa-lg.cursor-pointer', { onClick: (event) => { props.dispatch(actions.goHome()) }, }), h('h2.page-subtitle', 'Add Token'), ]), h('.error', { style: { display: warning ? 'block' : 'none', padding: '0 20px', textAlign: 'center', }, }, warning), // conf view h('.flex-column.flex-justify-center.flex-grow.select-none', [ h('.flex-space-around', { style: { padding: '20px', }, }, [ h('div', [ h('span', { style: { fontWeight: 'bold', paddingRight: '10px'}, }, 'Token Address'), ]), h('section.flex-row.flex-center', [ h('input#token-address', { name: 'address', placeholder: 'Token Address', onChange: this.tokenAddressDidChange.bind(this), style: { width: 'inherit', flex: '1 0 auto', height: '30px', margin: '8px', }, }), ]), h('div', [ h('span', { style: { fontWeight: 'bold', paddingRight: '10px'}, }, 'Token Symbol'), ]), h('div', { style: {display: 'flex'} }, [ h('input#token_symbol', { placeholder: `Like "ETH"`, value: symbol, style: { width: 'inherit', flex: '1 0 auto', height: '30px', margin: '8px', }, onChange: (event) => { var element = event.target var symbol = element.value this.setState({ symbol }) }, }), ]), h('div', [ h('span', { style: { fontWeight: 'bold', paddingRight: '10px'}, }, 'Decimals of Precision'), ]), h('div', { style: {display: 'flex'} }, [ h('input#token_decimals', { value: decimals, type: 'number', min: 0, max: 36, style: { width: 'inherit', flex: '1 0 auto', height: '30px', margin: '8px', }, onChange: (event) => { var element = event.target var decimals = element.value.trim() this.setState({ decimals }) }, }), ]), h('button', { style: { alignSelf: 'center', }, onClick: (event) => { const valid = this.validateInputs() if (!valid) return const { address, symbol, decimals } = this.state this.props.dispatch(actions.addToken(address.trim(), symbol.trim(), decimals)) }, }, 'Add'), ]), ]), ]) ) } AddTokenScreen.prototype.componentWillMount = function () { if (typeof global.ethereumProvider === 'undefined') return this.eth = new Eth(global.ethereumProvider) this.contract = new EthContract(this.eth) this.TokenContract = this.contract(abi) } AddTokenScreen.prototype.tokenAddressDidChange = function (event) { const el = event.target const address = el.value.trim() if (ethUtil.isValidAddress(address) && address !== emptyAddr) { this.setState({ address }) this.attemptToAutoFillTokenParams(address) } } AddTokenScreen.prototype.validateInputs = function () { let msg = '' const state = this.state const { address, symbol, decimals } = state const validAddress = ethUtil.isValidAddress(address) if (!validAddress) { msg += 'Address is invalid. ' } const validDecimals = decimals >= 0 && decimals < 36 if (!validDecimals) { msg += 'Decimals must be at least 0, and not over 36. ' } const symbolLen = symbol.trim().length const validSymbol = symbolLen > 0 && symbolLen < 10 if (!validSymbol) { msg += 'Symbol must be between 0 and 10 characters.' } const isValid = validAddress && validDecimals if (!isValid) { this.setState({ warning: msg, }) } else { this.setState({ warning: null }) } return isValid } AddTokenScreen.prototype.attemptToAutoFillTokenParams = async function (address) { const contract = this.TokenContract.at(address) const results = await Promise.all([ contract.symbol(), contract.decimals(), ]) const [ symbol, decimals ] = results if (symbol && decimals) { this.setState({ symbol: symbol[0], decimals: decimals[0].toString() }) } }