4byte fallback (#6551)

* Adds 4byte registry fallback to getMethodData() (#6435)

* Adds fetchWithCache to guard against unnecessary API calls

* Add custom fetch wrapper with abort on timeout

* Use opts and cacheRefreshTime in fetch-with-cache util

* Use custom fetch wrapper with timeout for fetch-with-cache

* Improve contract method data fetching (#6623)

* Remove async call from getTransactionActionKey()

* Stop blocking confirm screen rendering on method data loading, and base screen route on transactionCategory

* Remove use of withMethodData, fix use of knownMethodData, in relation to transaction-list-item.component

* Load data contract method data progressively, making it non-blocking; requires simplifying conf-tx-base lifecycle logic.

* Allow editing of gas price while loading on the confirm screen.

* Fix transactionAction component and its unit tests.

* Fix confirm transaction components for cases of route transitions within metamask.

* Only call toString on id if truthy in getNavigateTxData()

* Fix knownMethodData retrieval and data fetching from fourbyte

23 files changed, 376 insertions, 262 deletions

diff --git a/package-lock.json b/package-lock.json
index 9fe9a7623..73b748f1b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6233,6 +6233,12 @@
         }
       }
     },
+    "abortcontroller-polyfill": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/abortcontroller-polyfill/-/abortcontroller-polyfill-1.3.0.tgz",
+      "integrity": "sha512-lbWQgf+eRvku3va8poBlDBO12FigTQr9Zb7NIjXrePrhxWVKdCP2wbDl1tLDaYa18PWTom3UEWwdH13S46I+yA==",
+      "dev": true
+    },
     "abstract-leveldown": {
       "version": "2.6.3",
       "resolved": "https://registry.npmjs.org/abstract-leveldown/-/abstract-leveldown-2.6.3.tgz",
diff --git a/package.json b/package.json
index 8d700c897..c9c3bd633 100644
--- a/package.json
+++ b/package.json
@@ -200,6 +200,7 @@
     "@storybook/react": "^5.1.1",
     "addons-linter": "^1.10.0",
     "babel-core": "^6.26.3",
+    "abortcontroller-polyfill": "^1.3.0",
     "babel-eslint": "^8.0.0",
     "babel-plugin-transform-async-to-generator": "^6.24.1",
     "babel-plugin-transform-runtime": "^6.23.0",
diff --git a/test/helper.js b/test/helper.js
index 51f28de17..ddc2aba40 100644
--- a/test/helper.js
+++ b/test/helper.js
@@ -27,6 +27,7 @@ global.log = log
 
 // fetch
 global.fetch = require('isomorphic-fetch')
+require('abortcontroller-polyfill/dist/polyfill-patch-fetch')
 
 // dom
 require('jsdom-global')()
diff --git a/ui/app/components/app/transaction-action/tests/transaction-action.component.test.js b/ui/app/components/app/transaction-action/tests/transaction-action.component.test.js
index b22a9db39..16f2e256f 100644
--- a/ui/app/components/app/transaction-action/tests/transaction-action.component.test.js
+++ b/ui/app/components/app/transaction-action/tests/transaction-action.component.test.js
@@ -18,33 +18,6 @@ describe('TransactionAction Component', () => {
       }
     })
 
-    it('should render -- when methodData is still fetching', () => {
-      const methodData = { data: {}, done: false, error: null }
-      const transaction = {
-        id: 1,
-        status: 'confirmed',
-        submittedTime: 1534045442919,
-        time: 1534045440641,
-        txParams: {
-          from: '0xc5ae6383e126f901dcb06131d97a88745bfa88d6',
-          gas: '0x5208',
-          gasPrice: '0x3b9aca00',
-          nonce: '0x96',
-          to: '0x50a9d56c2b8ba9a5c7f2c08c3d26e0499f23a706',
-          value: '0x2386f26fc10000',
-        },
-      }
-
-      const wrapper = shallow(<TransactionAction
-        methodData={methodData}
-        transaction={transaction}
-        className="transaction-action"
-      />, { context: { t }})
-
-      assert.equal(wrapper.find('.transaction-action').length, 1)
-      assert.equal(wrapper.text(), '--')
-    })
-
     it('should render Sent Ether', () => {
       const methodData = { data: {}, done: true, error: null }
       const transaction = {
@@ -75,15 +48,7 @@ describe('TransactionAction Component', () => {
 
     it('should render Approved', async () => {
       const methodData = {
-        data: {
-          name: 'Approve',
-          params: [
-            { type: 'address' },
-            { type: 'uint256' },
-          ],
-        },
-        done: true,
-        error: null,
+        name: 'Approve',
       }
       const transaction = {
         id: 1,
@@ -99,6 +64,7 @@ describe('TransactionAction Component', () => {
           value: '0x2386f26fc10000',
           data: '0x095ea7b300000000000000000000000050a9d56c2b8ba9a5c7f2c08c3d26e0499f23a7060000000000000000000000000000000000000000000000000000000000000003',
         },
+        transactionCategory: 'contractInteraction',
       }
 
       const wrapper = shallow(
@@ -111,23 +77,12 @@ describe('TransactionAction Component', () => {
       )
 
       assert.ok(wrapper)
-      assert.equal(wrapper.find('.test-class').length, 1)
-      await wrapper.instance().getTransactionAction()
-      assert.equal(wrapper.state('transactionAction'), 'approve')
+      assert.equal(wrapper.find('.transaction-action').length, 1)
+      assert.equal(wrapper.find('.transaction-action').text().trim(), 'Approve')
     })
 
-    it('should render Accept Fulfillment', async () => {
-      const methodData = {
-        data: {
-          name: 'AcceptFulfillment',
-          params: [
-            { type: 'address' },
-            { type: 'uint256' },
-          ],
-        },
-        done: true,
-        error: null,
-      }
+    it('should render contractInteraction', async () => {
+      const methodData = {}
       const transaction = {
         id: 1,
         status: 'confirmed',
@@ -142,6 +97,7 @@ describe('TransactionAction Component', () => {
           value: '0x2386f26fc10000',
           data: '0x095ea7b300000000000000000000000050a9d56c2b8ba9a5c7f2c08c3d26e0499f23a7060000000000000000000000000000000000000000000000000000000000000003',
         },
+        transactionCategory: 'contractInteraction',
       }
 
       const wrapper = shallow(
@@ -154,9 +110,8 @@ describe('TransactionAction Component', () => {
       )
 
       assert.ok(wrapper)
-      assert.equal(wrapper.find('.test-class').length, 1)
-      await wrapper.instance().getTransactionAction()
-      assert.equal(wrapper.state('transactionAction'), ' Accept Fulfillment')
+      assert.equal(wrapper.find('.transaction-action').length, 1)
+      assert.equal(wrapper.find('.transaction-action').text().trim(), 'contractInteraction')
     })
   })
 })
diff --git a/ui/app/components/app/transaction-action/transaction-action.component.js b/ui/app/components/app/transaction-action/transaction-action.component.js
index 4a5efdaae..26012ff7f 100644
--- a/ui/app/components/app/transaction-action/transaction-action.component.js
+++ b/ui/app/components/app/transaction-action/transaction-action.component.js
@@ -15,43 +15,23 @@ export default class TransactionAction extends PureComponent {
     methodData: PropTypes.object,
   }
 
-  state = {
-    transactionAction: '',
-  }
-
-  componentDidMount () {
-    this.getTransactionAction()
-  }
-
-  componentDidUpdate () {
-    this.getTransactionAction()
-  }
-
-  async getTransactionAction () {
-    const { transactionAction } = this.state
+  getTransactionAction () {
     const { transaction, methodData } = this.props
-    const { data, done } = methodData
-    const { name = '' } = data
-
-    if (!done || transactionAction) {
-      return
-    }
+    const { name } = methodData
 
-    const actionKey = await getTransactionActionKey(transaction, data)
-    const action = actionKey
-      ? this.context.t(actionKey)
-      : camelCaseToCapitalize(name)
+    const actionKey = getTransactionActionKey(transaction)
+    const action = actionKey && this.context.t(actionKey)
+    const methodName = name && camelCaseToCapitalize(name)
 
-    this.setState({ transactionAction: action })
+    return methodName || action || ''
   }
 
   render () {
-    const { className, methodData: { done } } = this.props
-    const { transactionAction } = this.state
+    const { className } = this.props
 
     return (
       <div className={classnames('transaction-action', className)}>
-        { (done && transactionAction) || '--' }
+        { this.getTransactionAction() }
       </div>
     )
   }
diff --git a/ui/app/components/app/transaction-list-item/transaction-list-item.component.js b/ui/app/components/app/transaction-list-item/transaction-list-item.component.js
index 80b26469b..8bdb6a313 100644
--- a/ui/app/components/app/transaction-list-item/transaction-list-item.component.js
+++ b/ui/app/components/app/transaction-list-item/transaction-list-item.component.js
@@ -34,6 +34,8 @@ export default class TransactionListItem extends PureComponent {
     fetchBasicGasAndTimeEstimates: PropTypes.func,
     fetchGasEstimates: PropTypes.func,
     rpcPrefs: PropTypes.object,
+    data: PropTypes.string,
+    getContractMethodData: PropTypes.func,
   }
 
   static defaultProps = {
@@ -150,6 +152,12 @@ export default class TransactionListItem extends PureComponent {
       )
   }
 
+  componentDidMount () {
+    if (this.props.data) {
+      this.props.getContractMethodData(this.props.data)
+    }
+  }
+
   render () {
     const {
       assetImages,
@@ -214,7 +222,7 @@ export default class TransactionListItem extends PureComponent {
                 <TransactionListItemDetails
                   transactionGroup={transactionGroup}
                   onRetry={this.handleRetry}
-                  showRetry={showRetry && methodData.done}
+                  showRetry={showRetry}
                   onCancel={this.handleCancel}
                   showCancel={showCancel}
                   cancelDisabled={!hasEnoughCancelGas}
diff --git a/ui/app/components/app/transaction-list-item/transaction-list-item.container.js b/ui/app/components/app/transaction-list-item/transaction-list-item.container.js
index 5e88a2937..1675958aa 100644
--- a/ui/app/components/app/transaction-list-item/transaction-list-item.container.js
+++ b/ui/app/components/app/transaction-list-item/transaction-list-item.container.js
@@ -1,9 +1,8 @@
 import { connect } from 'react-redux'
 import { withRouter } from 'react-router-dom'
 import { compose } from 'recompose'
-import withMethodData from '../../../helpers/higher-order-components/with-method-data'
 import TransactionListItem from './transaction-list-item.component'
-import { setSelectedToken, showModal, showSidebar, addKnownMethodData } from '../../../store/actions'
+import { setSelectedToken, showModal, showSidebar, getContractMethodData } from '../../../store/actions'
 import { hexToDecimal } from '../../../helpers/utils/conversions.util'
 import { getTokenData } from '../../../helpers/utils/transactions.util'
 import { getHexGasTotal, increaseLastGasPrice } from '../../../helpers/utils/confirm-tx.util'
@@ -14,15 +13,15 @@ import {
   setCustomGasPriceForRetry,
   setCustomGasLimit,
 } from '../../../ducks/gas/gas.duck'
-import { getIsMainnet, preferencesSelector, getSelectedAddress, conversionRateSelector } from '../../../selectors/selectors'
+import { getIsMainnet, preferencesSelector, getSelectedAddress, conversionRateSelector, getKnownMethodData } from '../../../selectors/selectors'
 import { isBalanceSufficient } from '../../../pages/send/send.utils'
 
 const mapStateToProps = (state, ownProps) => {
-  const { metamask: { knownMethodData, accounts, provider, frequentRpcListDetail } } = state
+  const { metamask: { accounts, provider, frequentRpcListDetail } } = state
   const { showFiatInTestnets } = preferencesSelector(state)
   const isMainnet = getIsMainnet(state)
   const { transactionGroup: { primaryTransaction } = {} } = ownProps
-  const { txParams: { gas: gasLimit, gasPrice } = {} } = primaryTransaction
+  const { txParams: { gas: gasLimit, gasPrice, data } = {} } = primaryTransaction
   const selectedAccountBalance = accounts[getSelectedAddress(state)].balance
   const selectRpcInfo = frequentRpcListDetail.find(rpcInfo => rpcInfo.rpcUrl === provider.rpcTarget)
   const { rpcPrefs } = selectRpcInfo || {}
@@ -38,7 +37,7 @@ const mapStateToProps = (state, ownProps) => {
   })
 
   return {
-    knownMethodData,
+    methodData: getKnownMethodData(state, data) || {},
     showFiat: (isMainnet || !!showFiatInTestnets),
     selectedAccountBalance,
     hasEnoughCancelGas,
@@ -51,7 +50,7 @@ const mapDispatchToProps = dispatch => {
     fetchBasicGasAndTimeEstimates: () => dispatch(fetchBasicGasAndTimeEstimates()),
     fetchGasEstimates: (blockTime) => dispatch(fetchGasEstimates(blockTime)),
     setSelectedToken: tokenAddress => dispatch(setSelectedToken(tokenAddress)),
-    addKnownMethodData: (fourBytePrefix, methodData) => dispatch(addKnownMethodData(fourBytePrefix, methodData)),
+    getContractMethodData: methodData => dispatch(getContractMethodData(methodData)),
     retryTransaction: (transaction, gasPrice) => {
       dispatch(setCustomGasPriceForRetry(gasPrice || transaction.txParams.gasPrice))
       dispatch(setCustomGasLimit(transaction.txParams.gas))
@@ -97,5 +96,4 @@ const mergeProps = (stateProps, dispatchProps, ownProps) => {
 export default compose(
   withRouter,
   connect(mapStateToProps, mapDispatchToProps, mergeProps),
-  withMethodData,
 )(TransactionListItem)
diff --git a/ui/app/ducks/app/app.js b/ui/app/ducks/app/app.js
index b181092c1..04c8c7422 100644
--- a/ui/app/ducks/app/app.js
+++ b/ui/app/ducks/app/app.js
@@ -79,6 +79,7 @@ function reduceApp (state, action) {
     lastSelectedProvider: null,
     networksTabSelectedRpcUrl: '',
     networksTabIsInAddMode: false,
+    loadingMethodData: false,
   }, state.appState)
 
   switch (action.type) {
@@ -763,6 +764,17 @@ function reduceApp (state, action) {
         networksTabIsInAddMode: action.value,
       })
 
+    case actions.LOADING_METHOD_DATA_STARTED:
+      return extend(appState, {
+        loadingMethodData: true,
+      })
+
+    case actions.LOADING_METHOD_DATA_FINISHED:
+      return extend(appState, {
+        loadingMethodData: false,
+      })
+
+
     default:
       return appState
   }
diff --git a/ui/app/ducks/confirm-transaction/confirm-transaction.duck.js b/ui/app/ducks/confirm-transaction/confirm-transaction.duck.js
index 58b0ec8e8..b8d1a7e81 100644
--- a/ui/app/ducks/confirm-transaction/confirm-transaction.duck.js
+++ b/ui/app/ducks/confirm-transaction/confirm-transaction.duck.js
@@ -1,4 +1,3 @@
-import log from 'loglevel'
 import {
   conversionRateSelector,
   currentCurrencySelector,
@@ -18,12 +17,9 @@ import {
 
 import {
   getTokenData,
-  getMethodData,
-  isSmartContractAddress,
   sumHexes,
 } from '../../helpers/utils/transactions.util'
 
-import { getSymbolAndDecimals } from '../../helpers/utils/token-util'
 import { conversionUtil } from '../../helpers/utils/conversion-util'
 import { addHexPrefix } from 'ethereumjs-util'
 
@@ -348,7 +344,7 @@ export function updateTxDataAndCalculate (txData) {
 }
 
 export function setTransactionToConfirm (transactionId) {
-  return async (dispatch, getState) => {
+  return (dispatch, getState) => {
     const state = getState()
     const unconfirmedTransactionsHash = unconfirmedTransactionsHashSelector(state)
     const transaction = unconfirmedTransactionsHash[transactionId]
@@ -364,34 +360,14 @@ export function setTransactionToConfirm (transactionId) {
       dispatch(updateTxDataAndCalculate(txData))
 
       const { txParams } = transaction
-      const { to } = txParams
 
       if (txParams.data) {
-        const { tokens: existingTokens } = state
-        const { data, to: tokenAddress } = txParams
-
-        dispatch(setFetchingData(true))
-        const methodData = await getMethodData(data)
-        dispatch(updateMethodData(methodData))
+        const { data } = txParams
 
-        try {
-          const toSmartContract = await isSmartContractAddress(to || '')
-          dispatch(updateToSmartContract(toSmartContract))
-        } catch (error) {
-          log.error(error)
-        }
-        dispatch(setFetchingData(false))
 
         const tokenData = getTokenData(data)
         dispatch(updateTokenData(tokenData))
 
-        try {
-          const tokenSymbolData = await getSymbolAndDecimals(tokenAddress, existingTokens) || {}
-          const { symbol: tokenSymbol = '', decimals: tokenDecimals = '' } = tokenSymbolData
-          dispatch(updateTokenProps({ tokenSymbol, tokenDecimals }))
-        } catch (error) {
-          dispatch(updateTokenProps({ tokenSymbol: '', tokenDecimals: '' }))
-        }
       }
 
       if (txParams.nonce) {
diff --git a/ui/app/ducks/confirm-transaction/confirm-transaction.duck.test.js b/ui/app/ducks/confirm-transaction/confirm-transaction.duck.test.js
index d2e344663..9e26314e5 100644
--- a/ui/app/ducks/confirm-transaction/confirm-transaction.duck.test.js
+++ b/ui/app/ducks/confirm-transaction/confirm-transaction.duck.test.js
@@ -630,7 +630,7 @@ describe('Confirm Transaction Duck', () => {
       storeActions.forEach((action, index) => assert.equal(action.type, expectedActions[index]))
     })
 
-    it('updates confirmTransaction transaction', done => {
+    it('updates confirmTransaction transaction', () => {
       const mockState = {
         metamask: {
           conversionRate: 468.58,
@@ -673,13 +673,10 @@ describe('Confirm Transaction Duck', () => {
       ]
 
       store.dispatch(actions.setTransactionToConfirm(2603411941761054))
-        .then(() => {
-          const storeActions = store.getActions()
-          assert.equal(storeActions.length, expectedActions.length)
+      const storeActions = store.getActions()
+      assert.equal(storeActions.length, expectedActions.length)
 
-          storeActions.forEach((action, index) => assert.equal(action.type, expectedActions[index]))
-          done()
-        })
+      storeActions.forEach((action, index) => assert.equal(action.type, expectedActions[index]))
     })
   })
 })
diff --git a/ui/app/helpers/utils/fetch-with-cache.js b/ui/app/helpers/utils/fetch-with-cache.js
new file mode 100644
index 000000000..ac641c3c4
--- /dev/null
+++ b/ui/app/helpers/utils/fetch-with-cache.js
@@ -0,0 +1,28 @@
+import {
+  loadLocalStorageData,
+  saveLocalStorageData,
+} from '../../../lib/local-storage-helpers'
+import http from './fetch'
+
+const fetch = http({
+  timeout: 30000,
+})
+
+export default function fetchWithCache (url, opts, cacheRefreshTime = 360000) {
+  const currentTime = Date.now()
+  const cachedFetch = loadLocalStorageData('cachedFetch') || {}
+  const { cachedUrl, cachedTime } = cachedFetch[url] || {}
+  if (cachedUrl && currentTime - cachedTime < cacheRefreshTime) {
+    return cachedFetch[url]
+  } else {
+    cachedFetch[url] = { cachedUrl: url, cachedTime: currentTime }
+    saveLocalStorageData(cachedFetch, 'cachedFetch')
+    return fetch(url, {
+      referrerPolicy: 'no-referrer-when-downgrade',
+      body: null,
+      method: 'GET',
+      mode: 'cors',
+      ...opts,
+    })
+  }
+}
diff --git a/ui/app/helpers/utils/fetch.js b/ui/app/helpers/utils/fetch.js
new file mode 100644
index 000000000..7bb483818
--- /dev/null
+++ b/ui/app/helpers/utils/fetch.js
@@ -0,0 +1,25 @@
+/* global AbortController */
+
+export default function ({ timeout = 120000 } = {}) {
+  return function _fetch (url, opts) {
+    return new Promise(async (resolve, reject) => {
+      const abortController = new AbortController()
+      const abortSignal = abortController.signal
+      const f = fetch(url, {
+        ...opts,
+        signal: abortSignal,
+      })
+
+      const timer = setTimeout(() => abortController.abort(), timeout)
+
+      try {
+        const res = await f
+        clearTimeout(timer)
+        return resolve(res)
+      } catch (e) {
+        clearTimeout(timer)
+        return reject(e)
+      }
+    })
+  }
+}
diff --git a/ui/app/helpers/utils/fetch.test.js b/ui/app/helpers/utils/fetch.test.js
new file mode 100644
index 000000000..12724525a
--- /dev/null
+++ b/ui/app/helpers/utils/fetch.test.js
@@ -0,0 +1,54 @@
+import assert from 'assert'
+import nock from 'nock'
+
+import http from './fetch'
+
+describe('custom fetch fn', () => {
+  it('fetches a url', async () => {
+    nock('https://api.infura.io')
+      .get('/money')
+      .reply(200, '{"hodl": false}')
+
+    const fetch = http()
+    const response = await (await fetch('https://api.infura.io/money')).json()
+    assert.deepEqual(response, {
+      hodl: false,
+    })
+  })
+
+  it('throws when the request hits a custom timeout', async () => {
+    nock('https://api.infura.io')
+      .get('/moon')
+      .delay(2000)
+      .reply(200, '{"moon": "2012-12-21T11:11:11Z"}')
+
+    const fetch = http({
+      timeout: 123,
+    })
+
+    try {
+      await fetch('https://api.infura.io/moon').then(r => r.json())
+      assert.fail('Request should throw')
+    } catch (e) {
+      assert.ok(e)
+    }
+  })
+
+  it('should abort the request when the custom timeout is hit', async () => {
+    nock('https://api.infura.io')
+      .get('/moon')
+      .delay(2000)
+      .reply(200, '{"moon": "2012-12-21T11:11:11Z"}')
+
+    const fetch = http({
+      timeout: 123,
+    })
+
+    try {
+      await fetch('https://api.infura.io/moon').then(r => r.json())
+      assert.fail('Request should be aborted')
+    } catch (e) {
+      assert.deepEqual(e.message, 'Aborted')
+    }
+  })
+})
diff --git a/ui/app/helpers/utils/transactions.util.js b/ui/app/helpers/utils/transactions.util.js
index 99ccc3478..c84053ec7 100644
--- a/ui/app/helpers/utils/transactions.util.js
+++ b/ui/app/helpers/utils/transactions.util.js
@@ -7,7 +7,7 @@ import {
   TRANSACTION_STATUS_CONFIRMED,
 } from '../../../../app/scripts/controllers/transactions/enums'
 import prefixForNetwork from '../../../lib/etherscan-prefix-for-network'
-
+import fetchWithCache from './fetch-with-cache'
 
 import {
   TOKEN_METHOD_TRANSFER,
@@ -32,39 +32,57 @@ export function getTokenData (data = '') {
   return abiDecoder.decodeMethod(data)
 }
 
+async function getMethodFrom4Byte (fourBytePrefix) {
+  const fourByteResponse = (await fetchWithCache(`https://www.4byte.directory/api/v1/signatures/?hex_signature=${fourBytePrefix}`, {
+    referrerPolicy: 'no-referrer-when-downgrade',
+    body: null,
+    method: 'GET',
+    mode: 'cors',
+  }))
+
+  const fourByteJSON = await fourByteResponse.json()
+
+  if (fourByteJSON.count === 1) {
+    return fourByteJSON.results[0].text_signature
+  } else {
+    return null
+  }
+}
+
 const registry = new MethodRegistry({ provider: global.ethereumProvider })
 
 /**
- * Attempts to return the method data from the MethodRegistry library, if the method exists in the
- * registry. Otherwise, returns an empty object.
- * @param {string} data - The hex data (@code txParams.data) of a transaction
+ * Attempts to return the method data from the MethodRegistry library, the message registry library and the token abi, in that order of preference
+ * @param {string} fourBytePrefix - The prefix from the method code associated with the data
  * @returns {Object}
  */
-  export async function getMethodData (data = '') {
-    const prefixedData = ethUtil.addHexPrefix(data)
-    const fourBytePrefix = prefixedData.slice(0, 10)
-
-    try {
-      const sig = await registry.lookup(fourBytePrefix)
-
-      if (!sig) {
-        return {}
-      }
-
-      const parsedResult = registry.parse(sig)
-
-      return {
-        name: parsedResult.name,
-        params: parsedResult.args,
-      }
-    } catch (error) {
-      log.error(error)
-      const contractData = getTokenData(data)
-      const { name } = contractData || {}
-      return { name }
+export async function getMethodDataAsync (fourBytePrefix) {
+  try {
+    const fourByteSig = getMethodFrom4Byte(fourBytePrefix).catch((e) => {
+      log.error(e)
+      return null
+    })
+
+    let sig = await registry.lookup(fourBytePrefix)
+
+    if (!sig) {
+      sig = await fourByteSig
     }
 
+    if (!sig) {
+      return {}
+    }
+
+    const parsedResult = registry.parse(sig)
 
+    return {
+      name: parsedResult.name,
+      params: parsedResult.args,
+    }
+  } catch (error) {
+    log.error(error)
+    return {}
+  }
 }
 
 export function isConfirmDeployContract (txData = {}) {
@@ -87,11 +105,10 @@ export function getFourBytePrefix (data = '') {
 /**
  * Returns the action of a transaction as a key to be passed into the translator.
  * @param {Object} transaction - txData object
- * @param {Object} methodData - Data returned from eth-method-registry
  * @returns {string|undefined}
  */
-export async function getTransactionActionKey (transaction, methodData) {
-  const { txParams: { data, to } = {}, msgParams, type } = transaction
+export function getTransactionActionKey (transaction) {
+  const { msgParams, type, transactionCategory } = transaction
 
   if (type === 'cancel') {
     return CANCEL_ATTEMPT_ACTION_KEY
@@ -105,27 +122,23 @@ export async function getTransactionActionKey (transaction, methodData) {
     return DEPLOY_CONTRACT_ACTION_KEY
   }
 
-  if (data) {
-    const toSmartContract = await isSmartContractAddress(to)
-
-    if (!toSmartContract) {
-      return SEND_ETHER_ACTION_KEY
-    }
-
-    const { name } = methodData
-    const methodName = name && name.toLowerCase()
-
-    if (!methodName) {
-      return CONTRACT_INTERACTION_KEY
-    }
+  const isTokenAction = [
+    TOKEN_METHOD_TRANSFER,
+    TOKEN_METHOD_APPROVE,
+    TOKEN_METHOD_TRANSFER_FROM,
+  ].find(actionName => actionName === transactionCategory)
+  const isNonTokenSmartContract = transactionCategory === CONTRACT_INTERACTION_KEY
 
-    switch (methodName) {
+  if (isTokenAction || isNonTokenSmartContract) {
+    switch (transactionCategory) {
       case TOKEN_METHOD_TRANSFER:
         return SEND_TOKEN_ACTION_KEY
       case TOKEN_METHOD_APPROVE:
         return APPROVE_ACTION_KEY
       case TOKEN_METHOD_TRANSFER_FROM:
         return TRANSFER_FROM_ACTION_KEY
+      case CONTRACT_INTERACTION_KEY:
+        return CONTRACT_INTERACTION_KEY
       default:
         return undefined
     }
diff --git a/ui/app/pages/confirm-transaction-base/confirm-transaction-base.component.js b/ui/app/pages/confirm-transaction-base/confirm-transaction-base.component.js
index c6a05cf0f..5c46c8449 100644
--- a/ui/app/pages/confirm-transaction-base/confirm-transaction-base.component.js
+++ b/ui/app/pages/confirm-transaction-base/confirm-transaction-base.component.js
@@ -94,6 +94,7 @@ export default class ConfirmTransactionBase extends Component {
     advancedInlineGasShown: PropTypes.bool,
     insufficientBalance: PropTypes.bool,
     hideFiatConversion: PropTypes.bool,
+    transactionCategory: PropTypes.string,
   }
 
   state = {
@@ -268,6 +269,7 @@ export default class ConfirmTransactionBase extends Component {
       } = {},
       hideData,
       dataComponent,
+      transactionCategory,
     } = this.props
 
     if (hideData) {
@@ -279,7 +281,7 @@ export default class ConfirmTransactionBase extends Component {
         <div className="confirm-page-container-content__data-box-label">
           {`${t('functionType')}:`}
           <span className="confirm-page-container-content__function-type">
-            { name || t('notFound') }
+            { getMethodName(name) || this.context.tOrKey(transactionCategory) || this.context.t('contractInteraction') }
           </span>
         </div>
         {
@@ -464,6 +466,7 @@ export default class ConfirmTransactionBase extends Component {
 
   handleNextTx (txId) {
     const { history, clearConfirmTransaction } = this.props
+
     if (txId) {
       clearConfirmTransaction()
       history.push(`${CONFIRM_TRANSACTION_ROUTE}/${txId}`)
@@ -473,7 +476,7 @@ export default class ConfirmTransactionBase extends Component {
   getNavigateTxData () {
     const { currentNetworkUnapprovedTxs, txData: { id } = {} } = this.props
     const enumUnapprovedTxs = Object.keys(currentNetworkUnapprovedTxs).reverse()
-    const currentPosition = enumUnapprovedTxs.indexOf(id.toString())
+    const currentPosition = enumUnapprovedTxs.indexOf(id ? id.toString() : '')
 
     return {
       totalTx: enumUnapprovedTxs.length,
@@ -530,7 +533,6 @@ export default class ConfirmTransactionBase extends Component {
       valid: propsValid = true,
       errorMessage,
       errorKey: propsErrorKey,
-      actionKey,
       title,
       subtitle,
       hideSubtitle,
@@ -542,6 +544,7 @@ export default class ConfirmTransactionBase extends Component {
       assetImage,
       warning,
       unapprovedTxCount,
+      transactionCategory,
     } = this.props
     const { submitting, submitError } = this.state
 
@@ -557,7 +560,7 @@ export default class ConfirmTransactionBase extends Component {
         toAddress={toAddress}
         showEdit={onEdit && !isTxReprice}
         // In the event that the key is falsy (and inherently invalid), use a fallback string
-        action={this.context.tOrKey(actionKey) || getMethodName(name) || this.context.t('contractInteraction')}
+        action={getMethodName(name) || this.context.tOrKey(transactionCategory) || this.context.t('contractInteraction')}
         title={title}
         titleComponent={this.renderTitleComponent()}
         subtitle={subtitle}
diff --git a/ui/app/pages/confirm-transaction-base/confirm-transaction-base.container.js b/ui/app/pages/confirm-transaction-base/confirm-transaction-base.container.js
index 2b087f5cc..6b73b58f0 100644
--- a/ui/app/pages/confirm-transaction-base/confirm-transaction-base.container.js
+++ b/ui/app/pages/confirm-transaction-base/confirm-transaction-base.container.js
@@ -18,7 +18,7 @@ import { isBalanceSufficient, calcGasTotal } from '../send/send.utils'
 import { conversionGreaterThan } from '../../helpers/utils/conversion-util'
 import { MIN_GAS_LIMIT_DEC } from '../send/send.constants'
 import { checksumAddress, addressSlicer, valuesFor } from '../../helpers/utils/util'
-import {getMetaMaskAccounts, getAdvancedInlineGasShown, preferencesSelector, getIsMainnet} from '../../selectors/selectors'
+import { getMetaMaskAccounts, getAdvancedInlineGasShown, preferencesSelector, getIsMainnet, getKnownMethodData } from '../../selectors/selectors'
 
 const casedContractMap = Object.keys(contractMap).reduce((acc, base) => {
   return {
@@ -27,8 +27,9 @@ const casedContractMap = Object.keys(contractMap).reduce((acc, base) => {
   }
 }, {})
 
-const mapStateToProps = (state, props) => {
-  const { toAddress: propsToAddress } = props
+const mapStateToProps = (state, ownProps) => {
+  const { toAddress: propsToAddress, match: { params = {} } } = ownProps
+  const { id: paramsTransactionId } = params
   const { showFiatInTestnets } = preferencesSelector(state)
   const isMainnet = getIsMainnet(state)
   const { confirmTransaction, metamask, gas } = state
@@ -43,18 +44,18 @@ const mapStateToProps = (state, props) => {
     hexTransactionFee,
     hexTransactionTotal,
     tokenData,
-    methodData,
     txData,
     tokenProps,
     nonce,
   } = confirmTransaction
-  const { txParams = {}, lastGasPrice, id: transactionId } = txData
+  const { txParams = {}, lastGasPrice, id: transactionId, transactionCategory } = txData
   const {
     from: fromAddress,
     to: txParamsToAddress,
     gasPrice,
     gas: gasLimit,
     value: amount,
+    data,
   } = txParams
   const accounts = getMetaMaskAccounts(state)
   const {
@@ -87,8 +88,7 @@ const mapStateToProps = (state, props) => {
     )
 
   const isTxReprice = Boolean(lastGasPrice)
-
-  const transaction = R.find(({ id }) => id === transactionId)(selectedAddressTxList)
+  const transaction = R.find(({ id }) => id === (transactionId || Number(paramsTransactionId)))(selectedAddressTxList)
   const transactionStatus = transaction ? transaction.status : ''
 
   const currentNetworkUnapprovedTxs = R.filter(
@@ -104,6 +104,8 @@ const mapStateToProps = (state, props) => {
     conversionRate,
   })
 
+  const methodData = getKnownMethodData(state, data) || {}
+
   return {
     balance,
     fromAddress,
@@ -119,7 +121,7 @@ const mapStateToProps = (state, props) => {
     hexTransactionAmount,
     hexTransactionFee,
     hexTransactionTotal,
-    txData,
+    txData: Object.keys(txData).length ? txData : transaction || {},
     tokenData,
     methodData,
     tokenProps,
@@ -141,6 +143,7 @@ const mapStateToProps = (state, props) => {
     hideSubtitle: (!isMainnet && !showFiatInTestnets),
     hideFiatConversion: (!isMainnet && !showFiatInTestnets),
     metaMetricsSendCount,
+    transactionCategory,
   }
 }
 
diff --git a/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js b/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js
index 25f2402f1..fc0606365 100644
--- a/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js
+++ b/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.component.js
@@ -12,18 +12,17 @@ import {
   CONFIRM_TOKEN_METHOD_PATH,
   SIGNATURE_REQUEST_PATH,
 } from '../../helpers/constants/routes'
-import { isConfirmDeployContract } from '../../helpers/utils/transactions.util'
 import {
   TOKEN_METHOD_TRANSFER,
   TOKEN_METHOD_APPROVE,
   TOKEN_METHOD_TRANSFER_FROM,
+  DEPLOY_CONTRACT_ACTION_KEY,
+  SEND_ETHER_ACTION_KEY,
 } from '../../helpers/constants/transactions'
 
 export default class ConfirmTransactionSwitch extends Component {
   static propTypes = {
     txData: PropTypes.object,
-    methodData: PropTypes.object,
-    fetchingData: PropTypes.bool,
     isEtherTransaction: PropTypes.bool,
     isTokenMethod: PropTypes.bool,
   }
@@ -31,31 +30,21 @@ export default class ConfirmTransactionSwitch extends Component {
   redirectToTransaction () {
     const {
       txData,
-      methodData: { name },
-      fetchingData,
-      isEtherTransaction,
-      isTokenMethod,
     } = this.props
-    const { id, txParams: { data } = {} } = txData
+    const { id, txParams: { data } = {}, transactionCategory } = txData
 
-    if (fetchingData) {
-      return <Loading />
-    }
-
-    if (isConfirmDeployContract(txData)) {
+    if (transactionCategory === DEPLOY_CONTRACT_ACTION_KEY) {
       const pathname = `${CONFIRM_TRANSACTION_ROUTE}/${id}${CONFIRM_DEPLOY_CONTRACT_PATH}`
       return <Redirect to={{ pathname }} />
     }
 
-    if (isEtherTransaction && !isTokenMethod) {
+    if (transactionCategory === SEND_ETHER_ACTION_KEY) {
       const pathname = `${CONFIRM_TRANSACTION_ROUTE}/${id}${CONFIRM_SEND_ETHER_PATH}`
       return <Redirect to={{ pathname }} />
     }
 
     if (data) {
-      const methodName = name && name.toLowerCase()
-
-      switch (methodName) {
+      switch (transactionCategory) {
         case TOKEN_METHOD_TRANSFER: {
           const pathname = `${CONFIRM_TRANSACTION_ROUTE}/${id}${CONFIRM_SEND_TOKEN_PATH}`
           return <Redirect to={{ pathname }} />
diff --git a/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.container.js b/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.container.js
index 8213f0964..230a931ad 100644
--- a/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.container.js
+++ b/ui/app/pages/confirm-transaction-switch/confirm-transaction-switch.container.js
@@ -4,24 +4,27 @@ import {
   TOKEN_METHOD_TRANSFER,
   TOKEN_METHOD_APPROVE,
   TOKEN_METHOD_TRANSFER_FROM,
+  SEND_ETHER_ACTION_KEY,
 } from '../../helpers/constants/transactions'
+import { unconfirmedTransactionsListSelector } from '../../selectors/confirm-transaction'
 
-const mapStateToProps = state => {
-  const {
-    confirmTransaction: {
-      txData,
-      methodData,
-      fetchingData,
-      toSmartContract,
-    },
-  } = state
+const mapStateToProps = (state, ownProps) => {
+  const { metamask: { unapprovedTxs } } = state
+  const { match: { params = {}, url } } = ownProps
+  const urlId = url && url.match(/\d+/) && url.match(/\d+/)[0]
+  const { id: paramsId } = params
+  const transactionId = paramsId || urlId
+
+  const unconfirmedTransactions = unconfirmedTransactionsListSelector(state)
+  const totalUnconfirmed = unconfirmedTransactions.length
+  const transaction = totalUnconfirmed
+    ? unapprovedTxs[transactionId] || unconfirmedTransactions[totalUnconfirmed - 1]
+    : {}
 
   return {
-    txData,
-    methodData,
-    fetchingData,
-    isEtherTransaction: !toSmartContract,
-    isTokenMethod: [TOKEN_METHOD_APPROVE, TOKEN_METHOD_TRANSFER, TOKEN_METHOD_TRANSFER_FROM].includes(methodData.name && methodData.name.toLowerCase()),
+    txData: transaction,
+    isEtherTransaction: transaction && transaction.transactionCategory === SEND_ETHER_ACTION_KEY,
+    isTokenMethod: [TOKEN_METHOD_APPROVE, TOKEN_METHOD_TRANSFER, TOKEN_METHOD_TRANSFER_FROM].includes(transaction && transaction.transactionCategory && transaction.transactionCategory.toLowerCase()),
   }
 }
 
diff --git a/ui/app/pages/confirm-transaction/confirm-transaction.component.js b/ui/app/pages/confirm-transaction/confirm-transaction.component.js
index 35b8dc5aa..cca86fa9b 100644
--- a/ui/app/pages/confirm-transaction/confirm-transaction.component.js
+++ b/ui/app/pages/confirm-transaction/confirm-transaction.component.js
@@ -33,6 +33,10 @@ export default class ConfirmTransaction extends Component {
     confirmTransaction: PropTypes.object,
     clearConfirmTransaction: PropTypes.func,
     fetchBasicGasAndTimeEstimates: PropTypes.func,
+    transaction: PropTypes.object,
+    getContractMethodData: PropTypes.func,
+    transactionId: PropTypes.string,
+    paramsTransactionId: PropTypes.string,
   }
 
   getParamsTransactionId () {
@@ -45,8 +49,11 @@ export default class ConfirmTransaction extends Component {
       totalUnapprovedCount = 0,
       send = {},
       history,
-      confirmTransaction: { txData: { id: transactionId } = {} },
+      transaction: { txParams: { data } = {} } = {},
       fetchBasicGasAndTimeEstimates,
+      getContractMethodData,
+      transactionId,
+      paramsTransactionId,
     } = this.props
 
     if (!totalUnapprovedCount && !send.to) {
@@ -54,67 +61,44 @@ export default class ConfirmTransaction extends Component {
       return
     }
 
-    if (!transactionId) {
-      fetchBasicGasAndTimeEstimates()
-      this.setTransactionToConfirm()
-    }
+    fetchBasicGasAndTimeEstimates()
+    getContractMethodData(data)
+    this.props.setTransactionToConfirm(transactionId || paramsTransactionId)
   }
 
-  componentDidUpdate () {
+  componentDidUpdate (prevProps) {
     const {
       setTransactionToConfirm,
-      confirmTransaction: { txData: { id: transactionId } = {} },
+      transaction: { txData: { txParams: { data } = {} } = {} },
       clearConfirmTransaction,
+      getContractMethodData,
+      paramsTransactionId,
+      transactionId,
+      history,
+      totalUnapprovedCount,
     } = this.props
-    const paramsTransactionId = this.getParamsTransactionId()
 
-    if (paramsTransactionId && transactionId && paramsTransactionId !== transactionId + '') {
+    if (paramsTransactionId && transactionId && prevProps.paramsTransactionId !== paramsTransactionId) {
       clearConfirmTransaction()
+      getContractMethodData(data)
       setTransactionToConfirm(paramsTransactionId)
       return
-    }
-
-    if (!transactionId) {
-      this.setTransactionToConfirm()
-    }
-  }
-
-  setTransactionToConfirm () {
-    const {
-      history,
-      unconfirmedTransactions,
-      setTransactionToConfirm,
-    } = this.props
-    const paramsTransactionId = this.getParamsTransactionId()
-
-    if (paramsTransactionId) {
-      // Check to make sure params ID is valid
-      const tx = unconfirmedTransactions.find(({ id }) => id + '' === paramsTransactionId)
-
-      if (!tx) {
-        history.replace(DEFAULT_ROUTE)
-      } else {
-        setTransactionToConfirm(paramsTransactionId)
-      }
-    } else if (unconfirmedTransactions.length) {
-      const totalUnconfirmed = unconfirmedTransactions.length
-      const transaction = unconfirmedTransactions[totalUnconfirmed - 1]
-      const { id: transactionId, loadingDefaults } = transaction
-
-      if (!loadingDefaults) {
-        setTransactionToConfirm(transactionId)
-      }
+    } else if (prevProps.transactionId && !transactionId && !totalUnapprovedCount) {
+      history.replace(DEFAULT_ROUTE)
+      return
+    } else if (prevProps.transactionId && transactionId && prevProps.transactionId !== transactionId) {
+      history.replace(DEFAULT_ROUTE)
+      return
     }
   }
 
   render () {
-    const { confirmTransaction: { txData: { id } } = {} } = this.props
-    const paramsTransactionId = this.getParamsTransactionId()
-
+    const { transactionId, paramsTransactionId } = this.props
     // Show routes when state.confirmTransaction has been set and when either the ID in the params
     // isn't specified or is specified and matches the ID in state.confirmTransaction in order to
     // support URLs of /confirm-transaction or /confirm-transaction/<transactionId>
-    return id && (!paramsTransactionId || paramsTransactionId === id + '')
+
+    return transactionId && (!paramsTransactionId || paramsTransactionId === transactionId)
       ? (
         <Switch>
           <Route
diff --git a/ui/app/pages/confirm-transaction/confirm-transaction.container.js b/ui/app/pages/confirm-transaction/confirm-transaction.container.js
index 2dd5e833e..993e880c2 100644
--- a/ui/app/pages/confirm-transaction/confirm-transaction.container.js
+++ b/ui/app/pages/confirm-transaction/confirm-transaction.container.js
@@ -8,26 +8,45 @@ import {
 import {
   fetchBasicGasAndTimeEstimates,
 } from '../../ducks/gas/gas.duck'
+
+import {
+  getContractMethodData,
+} from '../../store/actions'
 import ConfirmTransaction from './confirm-transaction.component'
-import { getTotalUnapprovedCount } from '../../selectors/selectors'
 import { unconfirmedTransactionsListSelector } from '../../selectors/confirm-transaction'
 
-const mapStateToProps = state => {
-  const { metamask: { send }, confirmTransaction } = state
+const mapStateToProps = (state, ownProps) => {
+  const { metamask: { send, unapprovedTxs }, confirmTransaction } = state
+  const { match: { params = {} } } = ownProps
+  const { id } = params
+
+  const unconfirmedTransactions = unconfirmedTransactionsListSelector(state)
+  const totalUnconfirmed = unconfirmedTransactions.length
+  const transaction = totalUnconfirmed
+    ? unapprovedTxs[id] || unconfirmedTransactions[totalUnconfirmed - 1]
+    : {}
 
   return {
-    totalUnapprovedCount: getTotalUnapprovedCount(state),
+    totalUnapprovedCount: totalUnconfirmed,
     send,
     confirmTransaction,
-    unconfirmedTransactions: unconfirmedTransactionsListSelector(state),
+    unapprovedTxs,
+    id,
+    paramsTransactionId: id && String(id),
+    transactionId: transaction.id && String(transaction.id),
+    unconfirmedTransactions,
+    transaction,
   }
 }
 
 const mapDispatchToProps = dispatch => {
   return {
-    setTransactionToConfirm: transactionId => dispatch(setTransactionToConfirm(transactionId)),
+    setTransactionToConfirm: transactionId => {
+      dispatch(setTransactionToConfirm(transactionId))
+    },
     clearConfirmTransaction: () => dispatch(clearConfirmTransaction()),
     fetchBasicGasAndTimeEstimates: () => dispatch(fetchBasicGasAndTimeEstimates()),
+    getContractMethodData: (data) => dispatch(getContractMethodData(data)),
   }
 }
 
diff --git a/ui/app/selectors/custom-gas.js b/ui/app/selectors/custom-gas.js
index 5ba786f0f..1f7ee8f9f 100644
--- a/ui/app/selectors/custom-gas.js
+++ b/ui/app/selectors/custom-gas.js
@@ -119,6 +119,10 @@ function isCustomPriceSafe (state) {
     return true
   }
 
+  if (safeLow === null) {
+    return null
+  }
+
   const customPriceSafe = conversionGreaterThan(
     {
       value: customGasPrice,
diff --git a/ui/app/selectors/selectors.js b/ui/app/selectors/selectors.js
index c7cb80024..56591b7b0 100644
--- a/ui/app/selectors/selectors.js
+++ b/ui/app/selectors/selectors.js
@@ -1,5 +1,6 @@
 import { NETWORK_TYPES } from '../helpers/constants/common'
-import { stripHexPrefix } from 'ethereumjs-util'
+import { stripHexPrefix, addHexPrefix } from 'ethereumjs-util'
+
 
 const abi = require('human-standard-token-abi')
 import {
@@ -50,6 +51,7 @@ const selectors = {
   isEthereumNetwork,
   getMetaMetricState,
   getRpcPrefsForCurrentProvider,
+  getKnownMethodData,
 }
 
 module.exports = selectors
@@ -335,3 +337,14 @@ function getRpcPrefsForCurrentProvider (state) {
   const { rpcPrefs = {} } = selectRpcInfo || {}
   return rpcPrefs
 }
+
+function getKnownMethodData (state, data) {
+  if (!data) {
+    return null
+  }
+  const prefixedData = addHexPrefix(data)
+  const fourBytePrefix = prefixedData.slice(0, 10)
+  const { knownMethodData } = state.metamask
+
+  return knownMethodData && knownMethodData[fourBytePrefix]
+}
diff --git a/ui/app/store/actions.js b/ui/app/store/actions.js
index 7f6cbea1f..aff2636ba 100644
--- a/ui/app/store/actions.js
+++ b/ui/app/store/actions.js
@@ -8,6 +8,7 @@ const {
 } = require('../pages/send/send.utils')
 const ethUtil = require('ethereumjs-util')
 const { fetchLocale } = require('../helpers/utils/i18n-helper')
+const { getMethodDataAsync } = require('../helpers/utils/transactions.util')
 const log = require('loglevel')
 const { ENVIRONMENT_TYPE_NOTIFICATION } = require('../../../app/scripts/lib/enums')
 const { hasUnconfirmedTransactions } = require('../helpers/utils/confirm-tx.util')
@@ -360,6 +361,12 @@ var actions = {
   // AppStateController-related actions
   SET_LAST_ACTIVE_TIME: 'SET_LAST_ACTIVE_TIME',
   setLastActiveTime,
+
+  getContractMethodData,
+  loadingMethoDataStarted,
+  loadingMethoDataFinished,
+  LOADING_METHOD_DATA_STARTED: 'LOADING_METHOD_DATA_STARTED',
+  LOADING_METHOD_DATA_FINISHED: 'LOADING_METHOD_DATA_FINISHED',
 }
 
 module.exports = actions
@@ -2774,3 +2781,38 @@ function setLastActiveTime () {
     })
   }
 }
+
+function loadingMethoDataStarted () {
+  return {
+    type: actions.LOADING_METHOD_DATA_STARTED,
+  }
+}
+
+function loadingMethoDataFinished () {
+  return {
+    type: actions.LOADING_METHOD_DATA_FINISHED,
+  }
+}
+
+function getContractMethodData (data = '') {
+  return (dispatch, getState) => {
+    const prefixedData = ethUtil.addHexPrefix(data)
+    const fourBytePrefix = prefixedData.slice(0, 10)
+    const { knownMethodData } = getState().metamask
+    if (knownMethodData && knownMethodData[fourBytePrefix]) {
+      return Promise.resolve(knownMethodData[fourBytePrefix])
+    }
+
+    dispatch(actions.loadingMethoDataStarted())
+    log.debug(`loadingMethodData`)
+
+    return getMethodDataAsync(fourBytePrefix)
+      .then(({ name, params }) => {
+        dispatch(actions.loadingMethoDataFinished())
+
+        background.addKnownMethodData(fourBytePrefix, { name, params })
+
+        return { name, params }
+      })
+  }
+}