Handling custom token decimal fetch failure due to network error (#10956)

app/_locales/en/messages.json

@@ -486,7 +486,7 @@
     "message": "Some of your account data was backed up during a previous installation of MetaMask. This could include your settings, contacts, and tokens. Would you like to restore this data now?"
   },
   "decimal": {
-    "message": "Decimals of Precision"
+    "message": "Token Decimal"
   },
   "decimalsMustZerotoTen": {
     "message": "Decimals must be at least 0, and not over 36."
@@ -2221,6 +2221,9 @@
   "tokenContractAddress": {
     "message": "Token Contract Address"
   },
+  "tokenDecimalFetchFailed": {
+    "message": "Token decimal required."
+  },
   "tokenSymbol": {
     "message": "Token Symbol"
   },
@@ -2352,6 +2355,10 @@
   "userName": {
     "message": "Username"
   },
+  "verifyThisTokenDecimalOn": {
+    "message": "Token decimal can be found on $1",
+    "description": "Points the user to etherscan as a place they can verify information about a token. $1 is replaced with the translation for \"etherscan\""
+  },
   "verifyThisTokenOn": {
     "message": "Verify this token on $1",
     "description": "Points the user to etherscan as a place they can verify information about a token. $1 is replaced with the translation for \"etherscan\""

package.json

@@ -100,7 +100,7 @@
     "@metamask/controllers": "^8.0.0",
     "@metamask/eth-ledger-bridge-keyring": "^0.5.0",
     "@metamask/eth-token-tracker": "^3.0.1",
-    "@metamask/etherscan-link": "^2.0.0",
+    "@metamask/etherscan-link": "^2.1.0",
     "@metamask/jazzicon": "^2.0.0",
     "@metamask/logo": "^2.5.0",
     "@metamask/obs-store": "^5.0.0",

ui/helpers/utils/token-util.js

@@ -13,7 +13,6 @@ const casedContractMap = Object.keys(contractMap).reduce((acc, base) => {
 }, {});
 
 const DEFAULT_SYMBOL = '';
-const DEFAULT_DECIMALS = '0';
 
 async function getSymbolFromContract(tokenAddress) {
   const token = util.getContractAtAddress(tokenAddress);
@@ -78,25 +77,6 @@ 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,
@@ -123,7 +103,7 @@ export async function getSymbolAndDecimals(tokenAddress, existingTokens = []) {
 
   return {
     symbol: symbol || DEFAULT_SYMBOL,
-    decimals: decimals || DEFAULT_DECIMALS,
+    decimals,
   };
 }
 

ui/pages/add-token/add-token.component.js

@@ -1,5 +1,6 @@
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
+import { getTokenTrackerLink } from '@metamask/etherscan-link';
 import { checkExistingAddresses } from '../../helpers/utils/util';
 import { tokenInfoGetter } from '../../helpers/utils/token-util';
 import { CONFIRM_ADD_TOKEN_ROUTE } from '../../helpers/constants/routes';
@@ -8,6 +9,10 @@ import PageContainer from '../../components/ui/page-container';
 import { Tabs, Tab } from '../../components/ui/tabs';
 import { isValidHexAddress } from '../../../shared/modules/hexstring-utils';
 import { addHexPrefix } from '../../../app/scripts/lib/util';
+import ActionableMessage from '../swaps/actionable-message';
+import Typography from '../../components/ui/typography';
+import { TYPOGRAPHY, FONT_WEIGHT } from '../../helpers/constants/design-system';
+import Button from '../../components/ui/button';
 import TokenList from './token-list';
 import TokenSearch from './token-search';
 
@@ -30,6 +35,8 @@ class AddToken extends Component {
     identities: PropTypes.object,
     showSearchTab: PropTypes.bool.isRequired,
     mostRecentOverviewPage: PropTypes.string.isRequired,
+    chainId: PropTypes.string,
+    rpcPrefs: PropTypes.object,
   };
 
   state = {
@@ -42,8 +49,9 @@ class AddToken extends Component {
     customAddressError: null,
     customSymbolError: null,
     customDecimalsError: null,
-    autoFilled: false,
     forceEditSymbol: false,
+    symbolAutoFilled: false,
+    decimalAutoFilled: false,
   };
 
   componentDidMount() {
@@ -148,10 +156,11 @@ class AddToken extends Component {
   }
 
   async attemptToAutoFillTokenParams(address) {
-    const { symbol = '', decimals = 0 } = await this.tokenInfoGetter(address);
+    const { symbol = '', decimals } = await this.tokenInfoGetter(address);
 
-    const autoFilled = Boolean(symbol && decimals);
-    this.setState({ autoFilled });
+    const symbolAutoFilled = Boolean(symbol);
+    const decimalAutoFilled = Boolean(decimals);
+    this.setState({ symbolAutoFilled, decimalAutoFilled });
     this.handleCustomSymbolChange(symbol || '');
     this.handleCustomDecimalsChange(decimals);
   }
@@ -162,7 +171,8 @@ class AddToken extends Component {
       customAddress,
       customAddressError: null,
       tokenSelectorError: null,
-      autoFilled: false,
+      symbolAutoFilled: false,
+      decimalAutoFilled: false,
     });
 
     const addressIsValid = isValidHexAddress(customAddress, {
@@ -213,16 +223,18 @@ class AddToken extends Component {
   }
 
   handleCustomDecimalsChange(value) {
-    const customDecimals = value.trim();
-    const validDecimals =
-      customDecimals !== null &&
-      customDecimals !== '' &&
-      customDecimals >= MIN_DECIMAL_VALUE &&
-      customDecimals <= MAX_DECIMAL_VALUE;
+    let customDecimals;
     let customDecimalsError = null;
 
-    if (!validDecimals) {
-      customDecimalsError = this.context.t('decimalsMustZerotoTen');
+    if (value) {
+      customDecimals = Number(value.trim());
+      customDecimalsError =
+        value < MIN_DECIMAL_VALUE || value > MAX_DECIMAL_VALUE
+          ? this.context.t('decimalsMustZerotoTen')
+          : null;
+    } else {
+      customDecimals = '';
+      customDecimalsError = this.context.t('tokenDecimalFetchFailed');
     }
 
     this.setState({ customDecimals, customDecimalsError });
@@ -236,10 +248,23 @@ class AddToken extends Component {
       customAddressError,
       customSymbolError,
       customDecimalsError,
-      autoFilled,
       forceEditSymbol,
+      symbolAutoFilled,
+      decimalAutoFilled,
     } = this.state;
 
+    const { chainId, rpcPrefs } = this.props;
+    const blockExplorerTokenLink = getTokenTrackerLink(
+      customAddress,
+      chainId,
+      null,
+      null,
+      { blockExplorerUrl: rpcPrefs?.blockExplorerUrl ?? null },
+    );
+    const blockExplorerLabel = rpcPrefs?.blockExplorerUrl
+      ? new URL(blockExplorerTokenLink).hostname
+      : this.context.t('etherscan');
+
     return (
       <div className="add-token__custom-token-form">
         <TextField
@@ -260,7 +285,7 @@ class AddToken extends Component {
               <span className="add-token__custom-symbol__label">
                 {this.context.t('tokenSymbol')}
               </span>
-              {autoFilled && !forceEditSymbol && (
+              {symbolAutoFilled && !forceEditSymbol && (
                 <div
                   className="add-token__custom-symbol__edit"
                   onClick={() => this.setState({ forceEditSymbol: true })}
@@ -276,7 +301,7 @@ class AddToken extends Component {
           error={customSymbolError}
           fullWidth
           margin="normal"
-          disabled={autoFilled && !forceEditSymbol}
+          disabled={symbolAutoFilled && !forceEditSymbol}
         />
         <TextField
           id="custom-decimals"
@@ -284,13 +309,47 @@ class AddToken extends Component {
           type="number"
           value={customDecimals}
           onChange={(e) => this.handleCustomDecimalsChange(e.target.value)}
-          error={customDecimalsError}
+          error={customDecimals ? customDecimalsError : null}
           fullWidth
           margin="normal"
-          disabled={autoFilled}
+          disabled={decimalAutoFilled}
           min={MIN_DECIMAL_VALUE}
           max={MAX_DECIMAL_VALUE}
         />
+        {customDecimals === '' && (
+          <ActionableMessage
+            message={
+              <>
+                <Typography
+                  variant={TYPOGRAPHY.H7}
+                  fontWeight={FONT_WEIGHT.BOLD}
+                >
+                  {this.context.t('tokenDecimalFetchFailed')}
+                </Typography>
+                <Typography
+                  variant={TYPOGRAPHY.H7}
+                  fontWeight={FONT_WEIGHT.NORMAL}
+                >
+                  {this.context.t('verifyThisTokenDecimalOn', [
+                    <Button
+                      type="link"
+                      key="add-token-verify-token-decimal"
+                      className="add-token__link"
+                      rel="noopener noreferrer"
+                      target="_blank"
+                      href={blockExplorerTokenLink}
+                    >
+                      {blockExplorerLabel}
+                    </Button>,
+                  ])}
+                </Typography>
+              </>
+            }
+            type="warning"
+            withRightButton
+            className="add-token__decimal-warning"
+          />
+        )}
       </div>
     );
   }

ui/pages/add-token/add-token.container.js

@@ -2,12 +2,20 @@ import { connect } from 'react-redux';
 
 import { setPendingTokens, clearPendingTokens } from '../../store/actions';
 import { getMostRecentOverviewPage } from '../../ducks/history/history';
-import { getIsMainnet } from '../../selectors/selectors';
+import {
+  getIsMainnet,
+  getRpcPrefsForCurrentProvider,
+} from '../../selectors/selectors';
 import AddToken from './add-token.component';
 
 const mapStateToProps = (state) => {
   const {
-    metamask: { identities, tokens, pendingTokens },
+    metamask: {
+      identities,
+      tokens,
+      pendingTokens,
+      provider: { chainId },
+    },
   } = state;
   return {
     identities,
@@ -15,6 +23,8 @@ const mapStateToProps = (state) => {
     tokens,
     pendingTokens,
     showSearchTab: getIsMainnet(state) || process.env.IN_TEST === 'true',
+    chainId,
+    rpcPrefs: getRpcPrefsForCurrentProvider(state),
   };
 };
 

ui/pages/add-token/add-token.test.js

@@ -82,7 +82,7 @@ describe('Add Token', () => {
 
       expect(
         wrapper.find('AddToken').instance().state.customDecimals,
-      ).toStrictEqual(tokenPrecision);
+      ).toStrictEqual(Number(tokenPrecision));
     });
 
     it('next', () => {

ui/pages/add-token/index.scss

@@ -1,6 +1,8 @@
 @import 'token-list/index';
 
 .add-token {
+  $self: &;
+
   &__custom-token-form {
     padding: 8px 16px 16px;
 
@@ -13,6 +15,9 @@
       -webkit-appearance: none;
       display: none;
     }
+    & #{$self}__decimal-warning {
+      margin-top: 5px;
+    }
   }
 
   &__search-token {
@@ -41,4 +46,12 @@
       cursor: pointer;
     }
   }
+
+  &__link {
+    @include H7;
+
+    display: inline;
+    color: $primary-blue;
+    padding-left: 0;
+  }
 }

ui/store/actions.js

@@ -9,7 +9,7 @@ import {
   loadRelativeTimeFormatLocaleData,
 } from '../helpers/utils/i18n-helper';
 import { getMethodDataAsync } from '../helpers/utils/transactions.util';
-import { fetchSymbolAndDecimals } from '../helpers/utils/token-util';
+import { getSymbolAndDecimals } from '../helpers/utils/token-util';
 import switchDirection from '../helpers/utils/switch-direction';
 import { ENVIRONMENT_TYPE_NOTIFICATION } from '../../shared/constants/app';
 import { hasUnconfirmedTransactions } from '../helpers/utils/confirm-tx.util';
@@ -24,7 +24,6 @@ import { switchedToUnconnectedAccount } from '../ducks/alerts/unconnected-accoun
 import { getUnconnectedAccountAlertEnabledness } from '../ducks/metamask/metamask';
 import { toChecksumHexAddress } from '../../shared/modules/hexstring-utils';
 import { LISTED_CONTRACT_ADDRESSES } from '../../shared/constants/tokens';
-import { toChecksumHexAddress } from '../../shared/modules/hexstring-utils';
 import * as actionConstants from './actionConstants';
 
 let background = null;
@@ -2252,7 +2251,7 @@ export function setPendingTokens(pendingTokens) {
   const { customToken = {}, selectedTokens = {} } = pendingTokens;
   const { address, symbol, decimals } = customToken;
   const tokens =
-    address && symbol && decimals
+    address && symbol && decimals >= 0 <= 36
       ? {
           ...selectedTokens,
           [address]: {
@@ -2654,12 +2653,10 @@ export function getTokenParams(tokenAddress) {
     dispatch(loadingTokenParamsStarted());
     log.debug(`loadingTokenParams`);
 
-    return fetchSymbolAndDecimals(tokenAddress, existingTokens).then(
-      ({ symbol, decimals }) => {
+    return getSymbolAndDecimals(tokenAddress).then(({ symbol, decimals }) => {
       dispatch(addToken(tokenAddress, symbol, Number(decimals)));
       dispatch(loadingTokenParamsFinished());
-      },
-    );
+    });
   };
 }
 

yarn.lock

@@ -2739,10 +2739,10 @@
     human-standard-token-abi "^1.0.2"
     safe-event-emitter "^1.0.1"
 
-"@metamask/etherscan-link@^2.0.0":
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/@metamask/etherscan-link/-/etherscan-link-2.0.0.tgz#89035736515a39532ba1142d87b9a8c2b4f920f1"
-  integrity sha512-/YS32hS2UTTxs0KyUmAgaDj1w4dzAvOrT+p4TJtpICeH3E/k51r2FO0Or7WJJI/mpzTqNKgcH5yyS2oCtupGiA==
+"@metamask/etherscan-link@^2.1.0":
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/@metamask/etherscan-link/-/etherscan-link-2.1.0.tgz#c0be8e68445b7b83cf85bcc03a56cdf8e256c973"
+  integrity sha512-ADuWlTUkFfN2vXlz81Bg/0BA+XRor+CdK1055p6k7H6BLIPoDKn9SBOFld9haQFuR9cKh/JYHcnlSIv5R4fUEw==
 
 "@metamask/forwarder@^1.1.0":
   version "1.1.0"