Further refactors; includes refactor of send-v2.js and associated container

test/integration/index.js

@@ -2,7 +2,8 @@ const fs = require('fs')
 const path = require('path')
 const pump = require('pump')
 const browserify = require('browserify')
-const tests = fs.readdirSync(path.join(__dirname, 'lib'))
+let tests = fs.readdirSync(path.join(__dirname, 'lib'))
+tests = tests.filter(fln => fln.match(/send/))
 const bundlePath = path.join(__dirname, 'bundle.js')
 
 const b = browserify()

ui/app/actions.js

@@ -1,6 +1,11 @@
 const abi = require('human-standard-token-abi')
 const getBuyEthUrl = require('../../app/scripts/lib/buy-eth-url')
 const { getTokenAddressFromTokenObject } = require('./util')
+const {
+  calcGasTotal,
+  getParamsForGasEstimate,
+  calcTokenBalance,
+} = require('./components/send_/send.utils')
 const ethUtil = require('ethereumjs-util')
 const { fetchLocale } = require('../i18n-helper')
 const log = require('loglevel')
@@ -173,14 +178,16 @@ var actions = {
   updateGasLimit,
   updateGasPrice,
   updateGasTotal,
+  setGasTotal,
+  setSendTokenBalance,
   updateSendTokenBalance,
   updateSendFrom,
   updateSendTo,
   updateSendAmount,
   updateSendMemo,
-  updateSendErrors,
   setMaxModeTo,
   updateSend,
+  updateSendErrors,
   clearSend,
   setSelectedAddress,
   // app messages
@@ -716,14 +723,64 @@ function updateGasPrice (gasPrice) {
   }
 }
 
-function updateGasTotal (gasTotal) {
+function setGasTotal (gasTotal) {
   return {
     type: actions.UPDATE_GAS_TOTAL,
     value: gasTotal,
   }
 }
 
-function updateSendTokenBalance (tokenBalance) {
+function updateGasTotal ({ selectedAddress, selectedToken, data }) {
+  return (dispatch) => {
+    const { symbol } = selectedToken || {}
+    const estimateGasParams = getParamsForGasEstimate(selectedAddress, symbol, data)
+    return Promise.all([
+      dispatch(actions.getGasPrice()),
+      dispatch(actions.estimateGas(estimateGasParams)),
+    ])
+    .then(([gasPrice, gas]) => {
+      const newGasTotal = calcGasTotal(gas, gasPrice)
+      dispatch(actions.setGasTotal(newGasTotal))
+      dispatch(updateSendErrors({ gasLoadingError: null }))
+    })
+    .catch(err => {
+      log.error(err)
+      dispatch(updateSendErrors({ gasLoadingError: 'gasLoadingError' }))
+    })
+  }
+}
+
+function updateSendTokenBalance ({
+  selectedToken,
+  tokenContract,
+  address,
+}) {
+  return (dispatch) => {
+    const tokenBalancePromise = tokenContract
+      ? tokenContract.balanceOf(address)
+      : Promise.resolve()
+    return tokenBalancePromise
+      .then(usersToken => {
+        if (usersToken) {
+          const newTokenBalance = calcTokenBalance({ selectedToken, usersToken })
+          dispatch(setSendTokenBalance(newTokenBalance))
+        }
+      })
+      .catch(err => {
+        log.error(err)
+        updateSendErrors({ tokenBalance: 'tokenBalanceError' })
+      })
+  }
+}
+
+function updateSendErrors (errorObject) {
+  return {
+    type: actions.UPDATE_SEND_ERRORS,
+    value: errorObject,
+  }
+}
+
+function setSendTokenBalance (tokenBalance) {
   return {
     type: actions.UPDATE_SEND_TOKEN_BALANCE,
     value: tokenBalance,
@@ -758,13 +815,6 @@ function updateSendMemo (memo) {
   }
 }
 
-function updateSendErrors (error) {
-  return {
-    type: actions.UPDATE_SEND_ERRORS,
-    value: error,
-  }
-}
-
 function setMaxModeTo (bool) {
   return {
     type: actions.UPDATE_MAX_MODE,

ui/app/app.js

@@ -11,7 +11,7 @@ const log = require('loglevel')
 // init
 const InitializeScreen = require('../../mascara/src/app/first-time').default
 // accounts
-const SendTransactionScreen2 = require('./components/send/send-v2-container')
+const SendTransactionScreen = require('./components/send_/send.container')
 const ConfirmTxScreen = require('./conf-tx')
 
 // slideout menu
@@ -84,7 +84,7 @@ class App extends Component {
         h(Initialized, { path: RESTORE_VAULT_ROUTE, exact, component: RestoreVaultPage }),
         h(Initialized, { path: NOTICE_ROUTE, exact, component: NoticeScreen }),
         h(Authenticated, { path: CONFIRM_TRANSACTION_ROUTE, component: ConfirmTxScreen }),
-        h(Authenticated, { path: SEND_ROUTE, exact, component: SendTransactionScreen2 }),
+        h(Authenticated, { path: SEND_ROUTE, exact, component: SendTransactionScreen }),
         h(Authenticated, { path: ADD_TOKEN_ROUTE, exact, component: AddTokenPage }),
         h(Authenticated, { path: NEW_ACCOUNT_ROUTE, component: CreateAccountPage }),
         h(Authenticated, { path: DEFAULT_ROUTE, exact, component: Home }),

ui/app/components/customize-gas-modal/index.js

@@ -8,6 +8,10 @@ const GasModalCard = require('./gas-modal-card')
 
 const ethUtil = require('ethereumjs-util')
 
+import {
+  updateSendErrors,
+} from '../../ducks/send'
+
 const {
   MIN_GAS_PRICE_DEC,
   MIN_GAS_LIMIT_DEC,
@@ -63,9 +67,9 @@ function mapDispatchToProps (dispatch) {
     hideModal: () => dispatch(actions.hideModal()),
     updateGasPrice: newGasPrice => dispatch(actions.updateGasPrice(newGasPrice)),
     updateGasLimit: newGasLimit => dispatch(actions.updateGasLimit(newGasLimit)),
-    updateGasTotal: newGasTotal => dispatch(actions.updateGasTotal(newGasTotal)),
+    updateGasTotal: newGasTotal => dispatch(actions.setGasTotal(newGasTotal)),
     updateSendAmount: newAmount => dispatch(actions.updateSendAmount(newAmount)),
-    updateSendErrors: error => dispatch(actions.updateSendErrors(error)),
+    updateSendErrors: error => dispatch(updateSendErrors(error)),
   }
 }
 

ui/app/components/pending-tx/confirm-send-ether.js

@@ -29,6 +29,10 @@ const currencies = require('currency-formatter/currencies')
 const { MIN_GAS_PRICE_HEX } = require('../send/send-constants')
 const { SEND_ROUTE, DEFAULT_ROUTE } = require('../../routes')
 
+import {
+  updateSendErrors,
+} from '../../ducks/send'
+
 ConfirmSendEther.contextTypes = {
   t: PropTypes.func,
 }
@@ -105,7 +109,7 @@ function mapDispatchToProps (dispatch) {
       }))
       dispatch(actions.showModal({ name: 'CUSTOMIZE_GAS' }))
     },
-    updateSendErrors: error => dispatch(actions.updateSendErrors(error)),
+    updateSendErrors: error => dispatch(updateSendErrors(error)),
   }
 }
 

ui/app/components/pending-tx/confirm-send-token.js

@@ -39,6 +39,10 @@ const {
 } = require('../../selectors')
 const { SEND_ROUTE, DEFAULT_ROUTE } = require('../../routes')
 
+import {
+  updateSendErrors,
+} from '../../ducks/send'
+
 ConfirmSendToken.contextTypes = {
   t: PropTypes.func,
 }
@@ -141,7 +145,7 @@ function mapDispatchToProps (dispatch, ownProps) {
       }))
       dispatch(actions.showModal({ name: 'CUSTOMIZE_GAS' }))
     },
-    updateSendErrors: error => dispatch(actions.updateSendErrors(error)),
+    updateSendErrors: error => dispatch(updateSendErrors(error)),
   }
 }
 

ui/app/components/send/send-v2-container.js

@@ -18,6 +18,10 @@ const {
   getSelectedTokenContract,
 } = require('../../selectors')
 
+import {
+  updateSendErrors,
+} from '../../ducks/send'
+
 module.exports = compose(
   withRouter,
   connect(mapStateToProps, mapDispatchToProps)
@@ -74,7 +78,8 @@ function mapDispatchToProps (dispatch) {
     updateTx: txData => dispatch(actions.updateTransaction(txData)),
     setSelectedAddress: address => dispatch(actions.setSelectedAddress(address)),
     addToAddressBook: (address, nickname) => dispatch(actions.addToAddressBook(address, nickname)),
-    updateGasTotal: newTotal => dispatch(actions.updateGasTotal(newTotal)),
+    setGasTotal: newTotal => dispatch(actions.setGasTotal(newTotal)),
+    updateGasTotal: () => dispatch(actions.updateGasTotal()),
     updateGasPrice: newGasPrice => dispatch(actions.updateGasPrice(newGasPrice)),
     updateGasLimit: newGasLimit => dispatch(actions.updateGasLimit(newGasLimit)),
     updateSendTokenBalance: tokenBalance => dispatch(actions.updateSendTokenBalance(tokenBalance)),
@@ -82,7 +87,7 @@ function mapDispatchToProps (dispatch) {
     updateSendTo: (newTo, nickname) => dispatch(actions.updateSendTo(newTo, nickname)),
     updateSendAmount: newAmount => dispatch(actions.updateSendAmount(newAmount)),
     updateSendMemo: newMemo => dispatch(actions.updateSendMemo(newMemo)),
-    updateSendErrors: newError => dispatch(actions.updateSendErrors(newError)),
+    updateSendErrors: newError => dispatch(updateSendErrors(newError)),
     clearSend: () => dispatch(actions.clearSend()),
     setMaxModeTo: bool => dispatch(actions.setMaxModeTo(bool)),
   }

ui/app/components/send_/account-list-item/account-list-item.container.js

@@ -12,4 +12,4 @@ function mapStateToProps (state) {
     conversionRate: getConversionRate(state),
     currentCurrency: getConvertedCurrency(state),
   }
-}
+}

ui/app/components/send_/send-content/send-amount-row/amount-max-button/amount-max-button.container.js

@@ -9,10 +9,12 @@ import { getMaxModeOn } from '../send-amount-row.selectors.js'
 import { calcMaxAmount } from './amount-max-button.utils.js'
 import {
   updateSendAmount,
-  updateSendErrors,
   setMaxModeTo,
-} from '../../../actions'
+} from '../../../../../actions'
 import AmountMaxButton from './amount-max-button.component'
+import {
+  updateSendErrors,
+} from '../../../../../ducks/send'
 
 export default connect(mapStateToProps, mapDispatchToProps)(AmountMaxButton)
 

ui/app/components/send_/send-content/send-amount-row/send-amount-row.component.js

@@ -8,7 +8,10 @@ export default class SendAmountRow extends Component {
 
   static propTypes = {
     amount: PropTypes.string,
-    amountConversionRate: PropTypes.number,
+    amountConversionRate: PropTypes.oneOfType([
+      PropTypes.string,
+      PropTypes.number,
+    ]),
     balance: PropTypes.string,
     conversionRate: PropTypes.number,
     convertedCurrency: PropTypes.string,

ui/app/components/send_/send-content/send-amount-row/send-amount-row.container.js

@@ -1,24 +1,26 @@
 import { connect } from 'react-redux'
 import {
+  getAmountConversionRate,
   getConversionRate,
   getConvertedCurrency,
   getGasTotal,
+  getPrimaryCurrency,
   getSelectedToken,
   getSendAmount,
   getSendFromBalance,
   getTokenBalance,
-} from '../../send.selectors.js'
+} from '../../send.selectors'
 import {
-  getAmountConversionRate,
-  getPrimaryCurrency,
   sendAmountIsInError,
-} from './send-amount-row.selectors.js'
-import { getAmountErrorObject } from './send-amount-row.utils.js'
+} from './send-amount-row.selectors'
+import { getAmountErrorObject } from '../../send.utils'
 import {
   setMaxModeTo,
   updateSendAmount,
-  updateSendErrors,
 } from '../../../../actions'
+import {
+  updateSendErrors,
+} from '../../../../ducks/send'
 import SendAmountRow from './send-amount-row.component'
 
 export default connect(mapStateToProps, mapDispatchToProps)(SendAmountRow)

ui/app/components/send_/send-content/send-amount-row/send-amount-row.selectors.js

@@ -1,13 +1,5 @@
-import {
-  getSelectedToken,
-  getSelectedTokenToFiatRate,
-  getConversionRate,
-} from '../../send.selectors.js'
-
 const selectors = {
-  getAmountConversionRate,
   getMaxModeOn,
-  getPrimaryCurrency,
   sendAmountIsInError,
 }
 
@@ -18,16 +10,5 @@ function getMaxModeOn (state) {
 }
 
 function sendAmountIsInError (state) {
-  return Boolean(state.metamask.send.errors.amount)
-}
-
-function getPrimaryCurrency (state) {
-  const selectedToken = getSelectedToken(state)
-  return selectedToken && selectedToken.symbol
-}
-
-function getAmountConversionRate (state) {
-  return getSelectedToken(state)
-    ? getSelectedTokenToFiatRate(state)
-    : getConversionRate(state)
+  return Boolean(state.send.errors.amount)
 }

ui/app/components/send_/send-content/send-amount-row/send-amount-row.utils.js

@@ -1,61 +0,0 @@
-const {
-  conversionGreaterThan,
-} = require('../../../../conversion-util')
-const {
-  isBalanceSufficient,
-  isTokenBalanceSufficient,
-} = require('../../send.utils')
-
-function getAmountErrorObject ({
-  amount,
-  amountConversionRate,
-  balance,
-  conversionRate,
-  gasTotal,
-  primaryCurrency,
-  selectedToken,
-  tokenBalance,
-}) {
-  let insufficientFunds = false
-  if (gasTotal && conversionRate) {
-    insufficientFunds = !isBalanceSufficient({
-      amount: selectedToken ? '0x0' : amount,
-      amountConversionRate,
-      balance,
-      conversionRate,
-      gasTotal,
-      primaryCurrency,
-    })
-  }
-
-  let inSufficientTokens = false
-  if (selectedToken && tokenBalance !== null) {
-    const { decimals } = selectedToken
-    inSufficientTokens = !isTokenBalanceSufficient({
-      tokenBalance,
-      amount,
-      decimals,
-    })
-  }
-
-  const amountLessThanZero = conversionGreaterThan(
-    { value: 0, fromNumericBase: 'dec' },
-    { value: amount, fromNumericBase: 'hex' },
-  )
-
-  let amountError = null
-
-  if (insufficientFunds) {
-    amountError = 'insufficientFunds'
-  } else if (inSufficientTokens) {
-    amountError = 'insufficientTokens'
-  } else if (amountLessThanZero) {
-    amountError = 'negativeETH'
-  }
-
-  return { amount: amountError }
-}
-
-module.exports = {
-  getAmountErrorObject,
-}

ui/app/components/send_/send-content/send-from-row/send-from-row.component.js

@@ -14,19 +14,19 @@ export default class SendFromRow extends Component {
     openFromDropdown: PropTypes.func,
     tokenContract: PropTypes.object,
     updateSendFrom: PropTypes.func,
-    updateSendTokenBalance: PropTypes.func,
+    setSendTokenBalance: PropTypes.func,
   };
 
   async handleFromChange (newFrom) {
     const {
       updateSendFrom,
       tokenContract,
-      updateSendTokenBalance,
+      setSendTokenBalance,
     } = this.props
 
     if (tokenContract) {
       const usersToken = await tokenContract.balanceOf(newFrom.address)
-      updateSendTokenBalance(usersToken)
+      setSendTokenBalance(usersToken)
     }
     updateSendFrom(newFrom)
   }

ui/app/components/send_/send-content/send-from-row/send-from-row.container.js

@@ -11,7 +11,7 @@ import {
 import { calcTokenUpdateAmount } from './send-from-row.utils.js'
 import {
     updateSendFrom,
-    updateSendTokenBalance,
+    setSendTokenBalance,
 } from '../../../../actions'
 import {
     closeFromDropdown,
@@ -36,11 +36,11 @@ function mapDispatchToProps (dispatch) {
     closeFromDropdown: () => dispatch(closeFromDropdown()),
     openFromDropdown: () => dispatch(openFromDropdown()),
     updateSendFrom: newFrom => dispatch(updateSendFrom(newFrom)),
-    updateSendTokenBalance: (usersToken, selectedToken) => {
+    setSendTokenBalance: (usersToken, selectedToken) => {
         if (!usersToken) return
 
         const tokenBalance = calcTokenUpdateAmount(selectedToken, selectedToken)
-        dispatch(updateSendTokenBalance(tokenBalance))
+        dispatch(setSendTokenBalance(tokenBalance))
     },
   }
 }

ui/app/components/send_/send-content/send-gas-row/send-gas-row.component.js

@@ -18,23 +18,8 @@ export default class SendGasRow extends Component {
     showCustomizeGasModal: PropTypes.func,
     tokenContract: PropTypes.object,
     updateSendFrom: PropTypes.func,
-    updateSendTokenBalance: PropTypes.func,
   };
 
-  async handleFromChange (newFrom) {
-    const {
-      tokenContract,
-      updateSendFrom,
-      updateSendTokenBalance,
-    } = this.props
-
-    if (tokenContract) {
-      const usersToken = await tokenContract.balanceOf(newFrom.address)
-      updateSendTokenBalance(usersToken)
-    }
-    updateSendFrom(newFrom)
-  }
-
   render () {
     const {
       conversionRate,

ui/app/components/send_/send-content/send-row-wrapper/send-row-error-message/send-row-error-message.component.js

@@ -10,6 +10,7 @@ export default class SendRowErrorMessage extends Component {
 
   render () {
     const { errors, errorType } = this.props
+
     const errorMessage = errors[errorType]
 
     return (

ui/app/components/send_/send-content/send-to-row/send-to-row.container.js

@@ -10,12 +10,12 @@ import {
 } from './send-to-row.selectors.js'
 import { getToErrorObject } from './send-to-row.utils.js'
 import {
-    updateSendErrors,
     updateSendTo,
 } from '../../../../actions'
 import {
-    openToDropdown,
-    closeToDropdown,
+  updateSendErrors,
+  openToDropdown,
+  closeToDropdown,
 } from '../../../../ducks/send'
 import SendToRow from './send-to-row.component'
 

ui/app/components/send_/send.component.js

@@ -0,0 +1,143 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import PersistentForm from '../../../lib/persistent-form'
+import {
+  getAmountErrorObject,
+  doesAmountErrorRequireUpdate,
+} from './send.utils'
+
+import PageContainer from '..//page-container/page-container.component'
+import SendHeader from './send-header/send-header.container'
+import SendContent from './send-content/send-content.component'
+import SendFooter from './send-footer/send-footer.container'
+
+export default class SendTransactionScreen extends PersistentForm {
+
+  static propTypes = {
+    amount: PropTypes.string,
+    amountConversionRate: PropTypes.oneOfType([
+      PropTypes.string,
+      PropTypes.number,
+    ]),
+    conversionRate: PropTypes.number,
+    data: PropTypes.string,
+    editingTransactionId: PropTypes.string,
+    from: PropTypes.object,
+    gasLimit: PropTypes.string,
+    gasPrice: PropTypes.string,
+    gasTotal: PropTypes.string,
+    history: PropTypes.object,
+    network: PropTypes.string,
+    primaryCurrency: PropTypes.string,
+    selectedAddress: PropTypes.string,
+    selectedToken: PropTypes.object,
+    tokenBalance: PropTypes.string,
+    tokenContract: PropTypes.object,
+    updateAndSetGasTotal: PropTypes.func,
+    updateSendErrors: PropTypes.func,
+    updateSendTokenBalance: PropTypes.func,
+  };
+
+  updateGas () {
+    const {
+      data,
+      editingTransactionId,
+      gasLimit,
+      gasPrice,
+      selectedAddress,
+      selectedToken = {},
+      updateAndSetGasTotal,
+    } = this.props
+
+    updateAndSetGasTotal({
+      data,
+      editingTransactionId,
+      gasLimit,
+      gasPrice,
+      selectedAddress,
+      selectedToken,
+    })
+  }
+
+  componentDidUpdate (prevProps) {
+    const {
+      amount,
+      amountConversionRate,
+      conversionRate,
+      from: { address, balance },
+      gasTotal,
+      network,
+      primaryCurrency,
+      selectedToken,
+      tokenBalance,
+      updateSendErrors,
+      updateSendTokenBalance,
+      tokenContract,
+    } = this.props
+
+    const {
+      from: { balance: prevBalance },
+      gasTotal: prevGasTotal,
+      tokenBalance: prevTokenBalance,
+      network: prevNetwork,
+    } = prevProps
+
+    const uninitialized = [prevBalance, prevGasTotal].every(n => n === null)
+
+    if (!uninitialized) {
+      const amountErrorRequiresUpdate = doesAmountErrorRequireUpdate({
+        balance,
+        gasTotal,
+        prevBalance,
+        prevGasTotal,
+        prevTokenBalance,
+        selectedToken,
+        tokenBalance,
+      })
+
+      if (amountErrorRequiresUpdate) {
+        const amountErrorObject = getAmountErrorObject({
+          amount,
+          amountConversionRate,
+          balance,
+          conversionRate,
+          gasTotal,
+          primaryCurrency,
+          selectedToken,
+          tokenBalance,
+        })
+        updateSendErrors(amountErrorObject)
+      }
+
+      if (network !== prevNetwork && network !== 'loading') {
+        updateSendTokenBalance({
+          selectedToken,
+          tokenContract,
+          address,
+        })
+        this.updateGas()
+      }
+    }
+  }
+
+  componentWillMount () {
+    this.updateGas()
+  }
+
+  render () {
+    const { history } = this.props
+
+    return (
+      <PageContainer>
+        <SendHeader/>
+        <SendContent/>
+        <SendFooter history={history}/>
+      </PageContainer>
+    )
+  }
+
+}
+
+SendTransactionScreen.contextTypes = {
+  t: PropTypes.func,
+}

ui/app/components/send_/send.container.js

@@ -0,0 +1,88 @@
+import { connect } from 'react-redux'
+import abi from 'ethereumjs-abi'
+import SendEther from './send.component'
+import { withRouter } from 'react-router-dom'
+import { compose } from 'recompose'
+import {
+  getAmountConversionRate,
+  getConversionRate,
+  getCurrentNetwork,
+  getGasLimit,
+  getGasPrice,
+  getGasTotal,
+  getPrimaryCurrency,
+  getSelectedAddress,
+  getSelectedToken,
+  getSelectedTokenContract,
+  getSelectedTokenToFiatRate,
+  getSendAmount,
+  getSendEditingTransactionId,
+  getSendFromObject,
+  getTokenBalance,
+} from './send.selectors'
+import {
+  updateSendTokenBalance,
+  updateGasTotal,
+  setGasTotal,
+} from '../../actions'
+import {
+  updateSendErrors,
+} from '../../ducks/send'
+import {
+  calcGasTotal,
+  generateTokenTransferData,
+} from './send.utils.js'
+
+module.exports = compose(
+  withRouter,
+  connect(mapStateToProps, mapDispatchToProps)
+)(SendEther)
+
+function mapStateToProps (state) {
+  const selectedAddress = getSelectedAddress(state)
+  const selectedToken = getSelectedToken(state)
+
+  return {
+    amount: getSendAmount(state),
+    amountConversionRate: getAmountConversionRate(state),
+    conversionRate: getConversionRate(state),
+    data: generateTokenTransferData(abi, selectedAddress, selectedToken),
+    editingTransactionId: getSendEditingTransactionId(state),
+    from: getSendFromObject(state),
+    gasLimit: getGasLimit(state),
+    gasPrice: getGasPrice(state),
+    gasTotal: getGasTotal(state),
+    network: getCurrentNetwork(state),
+    primaryCurrency: getPrimaryCurrency(state),
+    selectedAddress: getSelectedAddress(state),
+    selectedToken: getSelectedToken(state),
+    tokenBalance: getTokenBalance(state),
+    tokenContract: getSelectedTokenContract(state),
+    tokenToFiatRate: getSelectedTokenToFiatRate(state),
+  }
+}
+
+function mapDispatchToProps (dispatch) {
+  return {
+    updateAndSetGasTotal: ({
+      data,
+      editingTransactionId,
+      gasLimit,
+      gasPrice,
+      selectedAddress,
+      selectedToken,
+    }) => {
+      !editingTransactionId
+        ? dispatch(updateGasTotal({ selectedAddress, selectedToken, data }))
+        : dispatch(setGasTotal(calcGasTotal(gasLimit, gasPrice)))
+    },
+    updateSendTokenBalance: ({ selectedToken, tokenContract, address }) => {
+      dispatch(updateSendTokenBalance({
+        selectedToken,
+        tokenContract,
+        address,
+      }))
+    },
+    updateSendErrors: newError => dispatch(updateSendErrors(newError)),
+  }
+}

ui/app/components/send_/send.selectors.js

@@ -8,6 +8,7 @@ const selectors = {
   accountsWithSendEtherInfoSelector,
   autoAddToBetaUI,
   getAddressBook,
+  getAmountConversionRate,
   getConversionRate,
   getConvertedCurrency,
   getCurrentAccountWithSendEtherInfo,
@@ -18,6 +19,7 @@ const selectors = {
   getGasLimit,
   getGasPrice,
   getGasTotal,
+  getPrimaryCurrency,
   getSelectedAccount,
   getSelectedAddress,
   getSelectedIdentity,
@@ -77,6 +79,12 @@ function getAddressBook (state) {
   return state.metamask.addressBook
 }
 
+function getAmountConversionRate (state) {
+  return getSelectedToken(state)
+    ? getSelectedTokenToFiatRate(state)
+    : getConversionRate(state)
+}
+
 function getConversionRate (state) {
   return state.metamask.conversionRate
 }
@@ -121,6 +129,11 @@ function getGasTotal (state) {
   return state.metamask.send.gasTotal
 }
 
+function getPrimaryCurrency (state) {
+  const selectedToken = getSelectedToken(state)
+  return selectedToken && selectedToken.symbol
+}
+
 function getSelectedAccount (state) {
   const accounts = state.metamask.accounts
   const selectedAddress = getSelectedAddress(state)
@@ -161,9 +174,8 @@ function getSelectedTokenExchangeRate (state) {
   const tokenExchangeRates = state.metamask.tokenExchangeRates
   const selectedToken = getSelectedToken(state) || {}
   const { symbol = '' } = selectedToken
-
   const pair = `${symbol.toLowerCase()}_eth`
-  const { rate: tokenExchangeRate = 0 } = tokenExchangeRates[pair] || {}
+  const { rate: tokenExchangeRate = 0 } = tokenExchangeRates && tokenExchangeRates[pair] || {}
 
   return tokenExchangeRate
 }
@@ -190,7 +202,7 @@ function getSendEditingTransactionId (state) {
 }
 
 function getSendErrors (state) {
-  return state.metamask.send.errors
+  return state.send.errors
 }
 
 function getSendFrom (state) {

ui/app/components/send_/send.utils.js

@@ -7,8 +7,22 @@ const {
 const {
   calcTokenAmount,
 } = require('../../token-util')
+const {
+  conversionGreaterThan,
+} = require('../../conversion-util')
 
-function getGasTotal (gasLimit, gasPrice) {
+module.exports = {
+  calcGasTotal,
+  doesAmountErrorRequireUpdate,
+  generateTokenTransferData,
+  getAmountErrorObject,
+  getParamsForGasEstimate,
+  calcTokenBalance,
+  isBalanceSufficient,
+  isTokenBalanceSufficient,
+}
+
+function calcGasTotal (gasLimit, gasPrice) {
   return multiplyCurrencies(gasLimit, gasPrice, {
     toNumericBase: 'hex',
     multiplicandBase: 16,
@@ -71,8 +85,99 @@ function isTokenBalanceSufficient ({
   return tokenBalanceIsSufficient
 }
 
-module.exports = {
-  getGasTotal,
-  isBalanceSufficient,
-  isTokenBalanceSufficient,
+function getAmountErrorObject ({
+  amount,
+  amountConversionRate,
+  balance,
+  conversionRate,
+  gasTotal,
+  primaryCurrency,
+  selectedToken,
+  tokenBalance,
+}) {
+  let insufficientFunds = false
+  if (gasTotal && conversionRate) {
+    insufficientFunds = !isBalanceSufficient({
+      amount: selectedToken ? '0x0' : amount,
+      amountConversionRate,
+      balance,
+      conversionRate,
+      gasTotal,
+      primaryCurrency,
+    })
+  }
+
+  let inSufficientTokens = false
+  if (selectedToken && tokenBalance !== null) {
+    const { decimals } = selectedToken
+    inSufficientTokens = !isTokenBalanceSufficient({
+      tokenBalance,
+      amount,
+      decimals,
+    })
+  }
+
+  const amountLessThanZero = conversionGreaterThan(
+    { value: 0, fromNumericBase: 'dec' },
+    { value: amount, fromNumericBase: 'hex' },
+  )
+
+  let amountError = null
+
+  if (insufficientFunds) {
+    amountError = 'insufficientFunds'
+  } else if (inSufficientTokens) {
+    amountError = 'insufficientTokens'
+  } else if (amountLessThanZero) {
+    amountError = 'negativeETH'
+  }
+
+  return { amount: amountError }
+}
+
+function getParamsForGasEstimate (selectedAddress, symbol, data) {
+  const estimatedGasParams = {
+    from: selectedAddress,
+    gas: '746a528800',
+  }
+
+  if (symbol) {
+    Object.assign(estimatedGasParams, { value: '0x0' })
+  }
+
+  if (data) {
+    Object.assign(estimatedGasParams, { data })
+  }
+
+  return estimatedGasParams
+}
+
+function calcTokenBalance ({ selectedToken, usersToken }) {
+  const { decimals } = selectedToken || {}
+  return calcTokenAmount(usersToken.balance.toString(), decimals)
+}
+
+function doesAmountErrorRequireUpdate ({
+  balance,
+  gasTotal,
+  prevBalance,
+  prevGasTotal,
+  prevTokenBalance,
+  selectedToken,
+  tokenBalance,
+}) {
+  const balanceHasChanged = balance !== prevBalance
+  const gasTotalHasChange = gasTotal !== prevGasTotal
+  const tokenBalanceHasChanged = selectedToken && tokenBalance !== prevTokenBalance
+  const amountErrorRequiresUpdate = balanceHasChanged || gasTotalHasChange || tokenBalanceHasChanged
+
+  return amountErrorRequiresUpdate
+}
+
+function generateTokenTransferData (abi, selectedAddress, selectedToken) {
+  if (!selectedToken) return
+  return Array.prototype.map.call(
+    abi.rawEncode(['address', 'uint256'], [selectedAddress, '0x0']),
+    x => ('00' + x.toString(16)).slice(-2)
+  ).join('')
 }

ui/app/ducks/send.js

@@ -5,6 +5,7 @@ const OPEN_FROM_DROPDOWN = 'metamask/send/OPEN_FROM_DROPDOWN'
 const CLOSE_FROM_DROPDOWN = 'metamask/send/CLOSE_FROM_DROPDOWN'
 const OPEN_TO_DROPDOWN = 'metamask/send/OPEN_TO_DROPDOWN'
 const CLOSE_TO_DROPDOWN = 'metamask/send/CLOSE_TO_DROPDOWN'
+const UPDATE_SEND_ERRORS = 'metamask/send/UPDATE_SEND_ERRORS'
 
 // TODO: determine if this approach to initState is consistent with conventional ducks pattern
 const initState = {
@@ -32,6 +33,13 @@ export default function reducer ({ send: sendState = initState }, action = {}) {
       return extend(sendState, {
         toDropdownOpen: false,
       })
+    case UPDATE_SEND_ERRORS:
+      return extend(sendState, {
+        errors: {
+          ...sendState.errors,
+          ...action.value,
+        },
+      })
     default:
       return sendState
   }
@@ -53,3 +61,10 @@ export function openToDropdown () {
 export function closeToDropdown () {
   return { type: CLOSE_TO_DROPDOWN }
 }
+
+export function updateSendErrors (errorObject) {
+  return {
+    type: UPDATE_SEND_ERRORS,
+    value: errorObject,
+  }
+}

ui/app/reducers/metamask.js

@@ -254,17 +254,6 @@ function reduceMetamask (state, action) {
         },
       })
 
-    case actions.UPDATE_SEND_ERRORS:
-      return extend(metamaskState, {
-        send: {
-          ...metamaskState.send,
-          errors: {
-            ...metamaskState.send.errors,
-            ...action.value,
-          },
-        },
-      })
-
     case actions.UPDATE_MAX_MODE:
       return extend(metamaskState, {
         send: {

ui/app/send-v2.js

@@ -84,7 +84,7 @@ SendTransactionScreen.prototype.updateGas = function () {
     estimateGas,
     selectedAddress,
     data,
-    updateGasTotal,
+    setGasTotal,
     from,
     tokenContract,
     editingTransactionId,
@@ -110,7 +110,7 @@ SendTransactionScreen.prototype.updateGas = function () {
       ])
       .then(([gasPrice, gas]) => {
         const newGasTotal = getGasTotal(gas, gasPrice)
-        updateGasTotal(newGasTotal)
+        setGasTotal(newGasTotal)
         this.setState({ gasLoadingError: false })
       })
       .catch(err => {
@@ -118,7 +118,7 @@ SendTransactionScreen.prototype.updateGas = function () {
       })
   } else {
     const newGasTotal = getGasTotal(gasLimit, gasPrice)
-    updateGasTotal(newGasTotal)
+    setGasTotal(newGasTotal)
   }
 }