Fixes display of confirm screen token decimals by not relying on confirmTransaction state.

ui/app/helpers/utils/token-util.js

@@ -68,6 +68,22 @@ async function getDecimals (tokenAddress) {
   return decimals
 }
 
+export async function fetchSymbolAndDecimals (tokenAddress) {
+  let symbol, decimals
+
+  try {
+    symbol = await getSymbol(tokenAddress)
+    decimals = await getDecimals(tokenAddress)
+  } catch (error) {
+    log.warn(`symbol() and decimal() calls for token at address ${tokenAddress} resulted in error:`, error)
+  }
+
+  return {
+    symbol: symbol || DEFAULT_SYMBOL,
+    decimals: decimals || DEFAULT_DECIMALS,
+  }
+}
+
 export async function getSymbolAndDecimals (tokenAddress, existingTokens = []) {
   const existingToken = existingTokens.find(({ address }) => tokenAddress === address)
 
@@ -116,3 +132,8 @@ export function getTokenValue (tokenParams = []) {
   const valueData = tokenParams.find(param => param.name === '_value')
   return valueData && valueData.value
 }
+
+export function getTokenToAddress (tokenParams = []) {
+  const toAddressData = tokenParams.find(param => param.name === '_to')
+  return toAddressData && toAddressData.value
+}

ui/app/helpers/utils/transactions.util.js

@@ -102,6 +102,20 @@ export function getFourBytePrefix (data = '') {
   return fourBytePrefix
 }
 
+/**
+  * Given an transaction category, returns a boolean which indicates whether the transaction is calling an erc20 token method
+  *
+  * @param {string} transactionCategory - The category of transaction being evaluated
+  * @returns {boolean} - whether the transaction is calling an erc20 token method
+  */
+export function isTokenMethodAction (transactionCategory) {
+  return [
+    TOKEN_METHOD_TRANSFER,
+    TOKEN_METHOD_APPROVE,
+    TOKEN_METHOD_TRANSFER_FROM,
+  ].includes(transactionCategory)
+}
+
 /**
  * Returns the action of a transaction as a key to be passed into the translator.
  * @param {Object} transaction - txData object
@@ -122,11 +136,7 @@ export function getTransactionActionKey (transaction) {
     return DEPLOY_CONTRACT_ACTION_KEY
   }
 
-  const isTokenAction = [
-    TOKEN_METHOD_TRANSFER,
-    TOKEN_METHOD_APPROVE,
-    TOKEN_METHOD_TRANSFER_FROM,
-  ].find(actionName => actionName === transactionCategory)
+  const isTokenAction = isTokenMethodAction(transactionCategory)
   const isNonTokenSmartContract = transactionCategory === CONTRACT_INTERACTION_KEY
 
   if (isTokenAction || isNonTokenSmartContract) {

ui/app/pages/confirm-token-transaction-base/confirm-token-transaction-base.container.js

@@ -1,27 +1,42 @@
 import { connect } from 'react-redux'
 import ConfirmTokenTransactionBase from './confirm-token-transaction-base.component'
 import {
-  tokenAmountAndToAddressSelector,
   contractExchangeRateSelector,
 } from '../../selectors/confirm-transaction'
+import { tokenSelector } from '../../selectors/tokens'
+import {
+  getTokenData,
+} from '../../helpers/utils/transactions.util'
+import {
+  calcTokenAmount,
+  getTokenToAddress,
+  getTokenValue,
+} from '../../helpers/utils/token-util'
+
 
-const mapStateToProps = (state, ownProps) => {
-  const { tokenAmount: ownTokenAmount } = ownProps
+const mapStateToProps = (state) => {
   const { confirmTransaction, metamask: { currentCurrency, conversionRate } } = state
   const {
-    txData: { txParams: { to: tokenAddress } = {} } = {},
-    tokenProps: { tokenSymbol } = {},
+    txData: { txParams: { to: tokenAddress, data } = {} } = {},
     fiatTransactionTotal,
     ethTransactionTotal,
   } = confirmTransaction
 
-  const { tokenAmount, toAddress } = tokenAmountAndToAddressSelector(state)
+
+  const tokens = tokenSelector(state)
+  const currentToken = tokens && tokens.find(({ address }) => tokenAddress === address)
+  const { decimals, symbol: tokenSymbol } = currentToken || {}
+
+  const tokenData = getTokenData(data)
+  const tokenValue = tokenData && getTokenValue(tokenData.params)
+  const toAddress = tokenData && getTokenToAddress(tokenData.params)
+  const tokenAmount = tokenData && calcTokenAmount(tokenValue, decimals).toString()
   const contractExchangeRate = contractExchangeRateSelector(state)
 
   return {
     toAddress,
     tokenAddress,
-    tokenAmount: typeof ownTokenAmount !== 'undefined' ? ownTokenAmount : tokenAmount,
+    tokenAmount,
     tokenSymbol,
     currentCurrency,
     conversionRate,

ui/app/pages/confirm-transaction/confirm-transaction.component.js

@@ -37,6 +37,8 @@ export default class ConfirmTransaction extends Component {
     getContractMethodData: PropTypes.func,
     transactionId: PropTypes.string,
     paramsTransactionId: PropTypes.string,
+    getTokenParams: PropTypes.func,
+    isTokenMethodAction: PropTypes.bool,
   }
 
   getParamsTransactionId () {
@@ -49,11 +51,13 @@ export default class ConfirmTransaction extends Component {
       totalUnapprovedCount = 0,
       send = {},
       history,
-      transaction: { txParams: { data } = {} } = {},
+      transaction: { txParams: { data, to } = {} } = {},
       fetchBasicGasAndTimeEstimates,
       getContractMethodData,
       transactionId,
       paramsTransactionId,
+      getTokenParams,
+      isTokenMethodAction,
     } = this.props
 
     if (!totalUnapprovedCount && !send.to) {
@@ -63,6 +67,9 @@ export default class ConfirmTransaction extends Component {
 
     fetchBasicGasAndTimeEstimates()
     getContractMethodData(data)
+    if (isTokenMethodAction) {
+      getTokenParams(to)
+    }
     this.props.setTransactionToConfirm(transactionId || paramsTransactionId)
   }
 

ui/app/pages/confirm-transaction/confirm-transaction.container.js

@@ -5,12 +5,16 @@ import {
   setTransactionToConfirm,
   clearConfirmTransaction,
 } from '../../ducks/confirm-transaction/confirm-transaction.duck'
+import {
+  isTokenMethodAction,
+} from '../../helpers/utils/transactions.util'
 import {
   fetchBasicGasAndTimeEstimates,
 } from '../../ducks/gas/gas.duck'
 
 import {
   getContractMethodData,
+  getTokenParams,
 } from '../../store/actions'
 import ConfirmTransaction from './confirm-transaction.component'
 import { unconfirmedTransactionsListSelector } from '../../selectors/confirm-transaction'
@@ -25,6 +29,7 @@ const mapStateToProps = (state, ownProps) => {
   const transaction = totalUnconfirmed
     ? unapprovedTxs[id] || unconfirmedTransactions[totalUnconfirmed - 1]
     : {}
+  const { id: transactionId, transactionCategory } = transaction
 
   return {
     totalUnapprovedCount: totalUnconfirmed,
@@ -33,9 +38,10 @@ const mapStateToProps = (state, ownProps) => {
     unapprovedTxs,
     id,
     paramsTransactionId: id && String(id),
-    transactionId: transaction.id && String(transaction.id),
+    transactionId: transactionId && String(transactionId),
     unconfirmedTransactions,
     transaction,
+    isTokenMethodAction: isTokenMethodAction(transactionCategory),
   }
 }
 
@@ -47,6 +53,7 @@ const mapDispatchToProps = dispatch => {
     clearConfirmTransaction: () => dispatch(clearConfirmTransaction()),
     fetchBasicGasAndTimeEstimates: () => dispatch(fetchBasicGasAndTimeEstimates()),
     getContractMethodData: (data) => dispatch(getContractMethodData(data)),
+    getTokenParams: (tokenAddress) => dispatch(getTokenParams(tokenAddress)),
   }
 }
 

ui/app/store/actions.js

@@ -9,6 +9,7 @@ const {
 const ethUtil = require('ethereumjs-util')
 const { fetchLocale } = require('../helpers/utils/i18n-helper')
 const { getMethodDataAsync } = require('../helpers/utils/transactions.util')
+const { fetchSymbolAndDecimals } = require('../helpers/utils/token-util')
 const log = require('loglevel')
 const { ENVIRONMENT_TYPE_NOTIFICATION } = require('../../../app/scripts/lib/enums')
 const { hasUnconfirmedTransactions } = require('../helpers/utils/confirm-tx.util')
@@ -367,6 +368,12 @@ var actions = {
   loadingMethoDataFinished,
   LOADING_METHOD_DATA_STARTED: 'LOADING_METHOD_DATA_STARTED',
   LOADING_METHOD_DATA_FINISHED: 'LOADING_METHOD_DATA_FINISHED',
+
+  getTokenParams,
+  loadingTokenParamsStarted,
+  LOADING_TOKEN_PARAMS_STARTED: 'LOADING_TOKEN_PARAMS_STARTED',
+  loadingTokenParamsFinished,
+  LOADING_TOKEN_PARAMS_FINISHED: 'LOADING_TOKEN_PARAMS_FINISHED',
 }
 
 module.exports = actions
@@ -2816,3 +2823,39 @@ function getContractMethodData (data = '') {
       })
   }
 }
+
+function loadingTokenParamsStarted () {
+  return {
+    type: actions.LOADING_TOKEN_PARAMS_STARTED,
+  }
+}
+
+function loadingTokenParamsFinished () {
+  return {
+    type: actions.LOADING_TOKEN_PARAMS_FINISHED,
+  }
+}
+
+function getTokenParams (tokenAddress) {
+  return (dispatch, getState) => {
+    const existingTokens = getState().metamask.tokens
+    const existingToken = existingTokens.find(({ address }) => tokenAddress === address)
+
+    if (existingToken) {
+      return Promise.resolve({
+        symbol: existingToken.symbol,
+        decimals: existingToken.decimals,
+      })
+    }
+
+    dispatch(actions.loadingTokenParamsStarted())
+    log.debug(`loadingTokenParams`)
+
+
+    return fetchSymbolAndDecimals(tokenAddress, existingTokens)
+      .then(({ symbol, decimals }) => {
+        dispatch(actions.addToken(tokenAddress, symbol, decimals))
+        dispatch(actions.loadingTokenParamsFinished())
+      })
+  }
+}