Token check (#610)

* update market rate calculation and input parsing for 0 decimal tokens

* remove style bump and revert tokens

* add custom warning for pasted tokens

* update centering

* upload dark theme

* update copy and loading state

* copy edits

* update color

* multiple cards

src/components/CurrencyInputPanel/index.js

@@ -18,7 +18,7 @@ import Modal from '../Modal'
 import TokenLogo from '../TokenLogo'
 import SearchIcon from '../../assets/images/magnifying-glass.svg'
 import { useTransactionAdder, usePendingApproval } from '../../contexts/Transactions'
-import { useTokenDetails, useAllTokenDetails } from '../../contexts/Tokens'
+import { useTokenDetails, useAllTokenDetails, INITIAL_TOKENS_CONTEXT } from '../../contexts/Tokens'
 import { useAddressBalance } from '../../contexts/Balances'
 import { ReactComponent as Close } from '../../assets/images/x.svg'
 import { transparentize } from 'polished'
@@ -244,6 +244,10 @@ const TokenFullName = styled.div`
   color: ${({ theme }) => theme.chaliceGray};
 `
 
+const FadedSpan = styled.span`
+  color: ${({ theme }) => theme.royalBlue};
+`
+
 const TokenRowBalance = styled.div`
   font-size: 1rem;
   line-height: 20px;
@@ -284,7 +288,8 @@ export default function CurrencyInputPanel({
   disableTokenSelect,
   selectedTokenAddress = '',
   showUnlock,
-  value
+  value,
+  urlAddedTokens
 }) {
   const { t } = useTranslation()
 
@@ -431,6 +436,7 @@ export default function CurrencyInputPanel({
           onDismiss={() => {
             setModalIsOpen(false)
           }}
+          urlAddedTokens={urlAddedTokens}
           onTokenSelect={onCurrencySelected}
           allBalances={allBalances}
         />
@@ -439,7 +445,7 @@ export default function CurrencyInputPanel({
   )
 }
 
-function CurrencySelectModal({ isOpen, onDismiss, onTokenSelect }) {
+function CurrencySelectModal({ isOpen, onDismiss, onTokenSelect, urlAddedTokens }) {
   const { t } = useTranslation()
 
   const [searchQuery, setSearchQuery] = useState('')
@@ -447,7 +453,7 @@ function CurrencySelectModal({ isOpen, onDismiss, onTokenSelect }) {
 
   const allTokens = useAllTokenDetails()
 
-  const { account } = useWeb3React()
+  const { account, chainId } = useWeb3React()
 
   // BigNumber.js instance
   const ethPrice = useETHPriceInUSD()
@@ -589,13 +595,25 @@ function CurrencySelectModal({ isOpen, onDismiss, onTokenSelect }) {
     }
 
     return filteredTokenList.map(({ address, symbol, name, balance, usdBalance }) => {
+      const urlAdded = urlAddedTokens && urlAddedTokens.hasOwnProperty(address)
+      const customAdded =
+        address !== 'ETH' &&
+        INITIAL_TOKENS_CONTEXT[chainId] &&
+        !INITIAL_TOKENS_CONTEXT[chainId].hasOwnProperty(address) &&
+        !urlAdded
+
       return (
         <TokenModalRow key={address} onClick={() => _onTokenSelect(address)}>
           <TokenRowLeft>
             <TokenLogo address={address} size={'2rem'} />
             <TokenSymbolGroup>
-              <span id="symbol">{symbol}</span>
-              <TokenFullName>{name}</TokenFullName>
+              <div>
+                <span id="symbol">{symbol}</span>
+                <FadedSpan>
+                  {urlAdded && '(Added by URL)'} {customAdded && '(Added by user)'}
+                </FadedSpan>
+              </div>
+              <TokenFullName> {name}</TokenFullName>
             </TokenSymbolGroup>
           </TokenRowLeft>
           <TokenRowRight>

src/components/ExchangePage/index.jsx

@@ -10,7 +10,7 @@ import { brokenTokens } from '../../constants'
 import { amountFormatter, calculateGasMargin } from '../../utils'
 
 import { useExchangeContract } from '../../hooks'
-import { useTokenDetails } from '../../contexts/Tokens'
+import { useTokenDetails, INITIAL_TOKENS_CONTEXT } from '../../contexts/Tokens'
 import { useTransactionAdder } from '../../contexts/Transactions'
 import { useAddressBalance, useExchangeReserves } from '../../contexts/Balances'
 import { useAddressAllowance } from '../../contexts/Allowances'
@@ -23,6 +23,7 @@ import AddressInputPanel from '../AddressInputPanel'
 import OversizedPanel from '../OversizedPanel'
 import TransactionDetails from '../TransactionDetails'
 import ArrowDown from '../../assets/svg/SVGArrowDown'
+import WarningCard from '../WarningCard'
 
 const INPUT = 0
 const OUTPUT = 1
@@ -248,7 +249,15 @@ function getMarketRate(
 
 export default function ExchangePage({ initialCurrency, sending = false, params }) {
   const { t } = useTranslation()
-  const { account, error } = useWeb3React()
+  const { account, chainId, error } = useWeb3React()
+
+  const urlAddedTokens = {}
+  if (params.inputCurrency) {
+    urlAddedTokens[params.inputCurrency] = true
+  }
+  if (params.outputCurrency) {
+    urlAddedTokens[params.outputCurrency] = true
+  }
 
   // BigNumber.js instance
   const ethPrice = useETHPriceInUSD()
@@ -710,10 +719,54 @@ export default function ExchangePage({ initialCurrency, sending = false, params
 
   const toggleWalletModal = useWalletModalToggle()
 
+  const newInputDetected =
+    inputCurrency !== 'ETH' && inputCurrency && !INITIAL_TOKENS_CONTEXT[chainId].hasOwnProperty(inputCurrency)
+
+  const newOutputDetected =
+    outputCurrency !== 'ETH' && outputCurrency && !INITIAL_TOKENS_CONTEXT[chainId].hasOwnProperty(outputCurrency)
+
+  const [showInputWarning, setShowInputWarning] = useState(false)
+  const [showOutputWarning, setShowOutputWarning] = useState(false)
+
+  useEffect(() => {
+    if (newInputDetected) {
+      setShowInputWarning(true)
+    } else {
+      setShowInputWarning(false)
+    }
+  }, [newInputDetected, setShowInputWarning])
+
+  useEffect(() => {
+    if (newOutputDetected) {
+      setShowOutputWarning(true)
+    } else {
+      setShowOutputWarning(false)
+    }
+  }, [newOutputDetected, setShowOutputWarning])
+
   return (
     <>
+      {showInputWarning && (
+        <WarningCard
+          onDismiss={() => {
+            setShowInputWarning(false)
+          }}
+          urlAddedTokens={urlAddedTokens}
+          currency={inputCurrency}
+        />
+      )}
+      {showOutputWarning && (
+        <WarningCard
+          onDismiss={() => {
+            setShowOutputWarning(false)
+          }}
+          urlAddedTokens={urlAddedTokens}
+          currency={outputCurrency}
+        />
+      )}
       <CurrencyInputPanel
         title={t('input')}
+        urlAddedTokens={urlAddedTokens}
         description={inputValueFormatted && independentField === OUTPUT ? estimatedText : ''}
         extraText={inputBalanceFormatted && formatBalance(inputBalanceFormatted)}
         extraTextClickHander={() => {
@@ -764,6 +817,7 @@ export default function ExchangePage({ initialCurrency, sending = false, params
         title={t('output')}
         description={outputValueFormatted && independentField === INPUT ? estimatedText : ''}
         extraText={outputBalanceFormatted && formatBalance(outputBalanceFormatted)}
+        urlAddedTokens={urlAddedTokens}
         onCurrencySelected={outputCurrency => {
           dispatchSwapState({
             type: 'SELECT_CURRENCY',

src/components/WarningCard/index.js

+import React, { useState } from 'react'
+import styled, { keyframes } from 'styled-components'
+
+import { useWeb3React } from '../../hooks'
+import { useTokenDetails } from '../../contexts/Tokens'
+import { getEtherscanLink } from '../../utils'
+
+import { Link } from '../../theme'
+import TokenLogo from '../TokenLogo'
+import { ReactComponent as Close } from '../../assets/images/x.svg'
+import question from '../../assets/images/question.svg'
+
+const Flex = styled.div`
+  display: flex;
+  justify-content: center;
+  padding: 2rem;
+
+  button {
+    max-width: 20rem;
+  }
+`
+
+const Wrapper = styled.div`
+  background: rgba(243, 190, 30, 0.1);
+  position: relative;
+  padding: 1rem;
+  border: 0.5px solid #f3be1e;
+  border-radius: 10px;
+  margin-bottom: 20px;
+  display: grid;
+  grid-template-rows: 1fr 1fr 1fr;
+  grid-row-gap: 10px;
+`
+
+const Row = styled.div`
+  display: flex;
+  align-items: center;
+  justify-items: flex-start;
+  & > * {
+    margin-right: 6px;
+  }
+`
+
+const CloseColor = styled(Close)`
+  color: #aeaeae;
+`
+
+const CloseIcon = styled.div`
+  position: absolute;
+  right: 1rem;
+  top: 14px;
+  &:hover {
+    cursor: pointer;
+    opacity: 0.6;
+  }
+
+  & > * {
+    height: 14px;
+    width: 14px;
+  }
+`
+
+const QuestionWrapper = styled.button`
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  margin: 0;
+  padding: 0;
+  margin-left: 0.4rem;
+  padding: 0.2rem;
+  border: none;
+  background: none;
+  outline: none;
+  cursor: default;
+  border-radius: 36px;
+
+  :hover,
+  :focus {
+    opacity: 0.7;
+  }
+`
+
+const HelpCircleStyled = styled.img`
+  height: 18px;
+  width: 18px;
+`
+
+const fadeIn = keyframes`
+  from {
+    opacity : 0;
+  }
+
+  to {
+    opacity : 1;
+  }
+`
+
+const Popup = styled(Flex)`
+  position: absolute;
+  width: 228px;
+  right: 110px;
+  top: 4px;
+  z-index: 10;
+  flex-direction: column;
+  align-items: center;
+  padding: 0.6rem 1rem;
+  line-height: 150%;
+  background: ${({ theme }) => theme.backgroundColor};
+  border: 1px solid ${({ theme }) => theme.mercuryGray};
+  border-radius: 8px;
+  animation: ${fadeIn} 0.15s linear;
+  color: ${({ theme }) => theme.textColor};
+  font-style: italic;
+
+  box-shadow: 0px 0px 1px rgba(0, 0, 0, 0.04), 0px 4px 8px rgba(0, 0, 0, 0.04), 0px 16px 24px rgba(0, 0, 0, 0.04),
+    0px 24px 32px rgba(0, 0, 0, 0.04);
+
+  ${({ theme }) => theme.mediaWidth.upToSmall`
+    left: 2px;
+    top: 50px;
+  `}
+`
+
+const Text = styled.div`
+  color: ${({ theme }) => theme.textColor};
+`
+
+function WarningCard({ onDismiss, urlAddedTokens, currency }) {
+  const [showPopup, setPopup] = useState()
+  const { chainId } = useWeb3React()
+  const { symbol: inputSymbol, name: inputName } = useTokenDetails(currency)
+  const fromURL = urlAddedTokens.hasOwnProperty(currency)
+
+  return (
+    <Wrapper>
+      <CloseIcon onClick={() => onDismiss()}>
+        <CloseColor alt={'close icon'} />
+      </CloseIcon>
+      <Row style={{ fontSize: '12px' }}>
+        <Text>{fromURL ? 'Token imported by URL ' : 'Token imported by user'}</Text>
+        <QuestionWrapper
+          onClick={() => {
+            setPopup(!showPopup)
+          }}
+          onMouseEnter={() => {
+            setPopup(true)
+          }}
+          onMouseLeave={() => {
+            setPopup(false)
+          }}
+        >
+          <HelpCircleStyled src={question} alt="popup" />
+        </QuestionWrapper>
+        {showPopup ? (
+          <Popup>
+            <Text>
+              The Uniswap smart contracts are designed to support any ERC20 token on Ethereum. Any token can be loaded
+              into the interface by entering its Ethereum address into the search field or passing it as a URL
+              parameter. Be careful when interacting with imported tokens as they have not been verified.
+            </Text>
+          </Popup>
+        ) : (
+          ''
+        )}
+      </Row>
+      <Row>
+        <TokenLogo address={currency} />
+        <div style={{ fontWeight: 500 }}>{inputName && inputSymbol ? inputName + ' (' + inputSymbol + ')' : ''}</div>
+        <Link style={{ fontWeight: 400 }} href={getEtherscanLink(chainId, currency, 'address')}>
+          (View on Etherscan)
+        </Link>
+      </Row>
+      <Row style={{ fontSize: '12px', fontStyle: 'italic' }}>
+        <Text>Please verify the legitimacy of this token before making any transactions.</Text>
+      </Row>
+    </Wrapper>
+  )
+}
+
+export default WarningCard

src/contexts/Tokens.js

@@ -26,7 +26,7 @@ const ETH = {
   }
 }
 
-const INITIAL_TOKENS_CONTEXT = {
+export const INITIAL_TOKENS_CONTEXT = {
   1: {
     '0xB6eD7644C69416d67B522e20bC294A9a9B405B31': {
       [NAME]: '0xBitcoin Token',
@@ -662,7 +662,6 @@ export function useTokenDetails(tokenAddress) {
       library
     ) {
       let stale = false
-
       const namePromise = getTokenName(tokenAddress, library).catch(() => null)
       const symbolPromise = getTokenSymbol(tokenAddress, library).catch(() => null)
       const decimalsPromise = getTokenDecimals(tokenAddress, library).catch(() => null)

src/pages/Pool/AddLiquidity.js

@@ -10,11 +10,13 @@ import CurrencyInputPanel from '../../components/CurrencyInputPanel'
 import OversizedPanel from '../../components/OversizedPanel'
 import ContextualInfo from '../../components/ContextualInfo'
 import { ReactComponent as Plus } from '../../assets/images/plus-blue.svg'
+import WarningCard from '../../components/WarningCard'
+
 import { useWeb3React, useExchangeContract } from '../../hooks'
 import { brokenTokens } from '../../constants'
 import { amountFormatter, calculateGasMargin } from '../../utils'
 import { useTransactionAdder } from '../../contexts/Transactions'
-import { useTokenDetails } from '../../contexts/Tokens'
+import { useTokenDetails, INITIAL_TOKENS_CONTEXT } from '../../contexts/Tokens'
 import { useAddressBalance, useExchangeReserves, useETHPriceInUSD } from '../../contexts/Balances'
 import { useAddressAllowance } from '../../contexts/Allowances'
 
@@ -198,11 +200,16 @@ function getMarketRate(reserveETH, reserveToken, decimals, invert = false) {
 
 export default function AddLiquidity({ params }) {
   const { t } = useTranslation()
-  const { library, account, active } = useWeb3React()
+  const { library, account, active, chainId } = useWeb3React()
 
   // BigNumber.js instance
   const ethPrice = useETHPriceInUSD()
 
+  const urlAddedTokens = {}
+  if (params.token) {
+    urlAddedTokens[params.token] = true
+  }
+
   // clear url of query
   useEffect(() => {
     const history = createBrowserHistory()
@@ -578,6 +585,18 @@ export default function AddLiquidity({ params }) {
   const isValid =
     (inputError === null || outputError === null) && !zeroDecimalError && !showUnlock && !brokenTokenWarning
 
+  const newOutputDetected =
+    outputCurrency !== 'ETH' && outputCurrency && !INITIAL_TOKENS_CONTEXT[chainId].hasOwnProperty(outputCurrency)
+
+  const [showOutputWarning, setShowOutputWarning] = useState(false)
+
+  useEffect(() => {
+    if (newOutputDetected) {
+      setShowOutputWarning(true)
+    } else {
+      setShowOutputWarning(false)
+    }
+  }, [newOutputDetected, setShowOutputWarning])
   return (
     <>
       {isNewExchange ? (
@@ -591,7 +610,15 @@ export default function AddLiquidity({ params }) {
           <NewExchangeWarningText>{t('initialExchangeRate', { symbol })}</NewExchangeWarningText>
         </NewExchangeWarning>
       ) : null}
-
+      {showOutputWarning && (
+        <WarningCard
+          onDismiss={() => {
+            setShowOutputWarning(false)
+          }}
+          urlAddedTokens={urlAddedTokens}
+          currency={outputCurrency}
+        />
+      )}
       <CurrencyInputPanel
         title={t('deposit')}
         extraText={inputBalance && formatBalance(amountFormatter(inputBalance, 18, 4))}
@@ -625,6 +652,7 @@ export default function AddLiquidity({ params }) {
         extraText={
           outputBalance && decimals && formatBalance(amountFormatter(outputBalance, decimals, Math.min(decimals, 4)))
         }
+        urlAddedTokens={urlAddedTokens}
         selectedTokenAddress={outputCurrency}
         onCurrencySelected={outputCurrency => {
           dispatchAddLiquidityState({ type: 'SELECT_CURRENCY', payload: outputCurrency })

src/pages/Pool/RemoveLiquidity.js

@@ -7,7 +7,7 @@ import styled from 'styled-components'
 
 import { useWeb3React, useExchangeContract } from '../../hooks'
 import { useTransactionAdder } from '../../contexts/Transactions'
-import { useTokenDetails } from '../../contexts/Tokens'
+import { useTokenDetails, INITIAL_TOKENS_CONTEXT } from '../../contexts/Tokens'
 import { useAddressBalance, useETHPriceInUSD } from '../../contexts/Balances'
 
 import { calculateGasMargin, amountFormatter } from '../../utils'
@@ -18,6 +18,7 @@ import CurrencyInputPanel from '../../components/CurrencyInputPanel'
 import ContextualInfo from '../../components/ContextualInfo'
 import OversizedPanel from '../../components/OversizedPanel'
 import ArrowDown from '../../assets/svg/SVGArrowDown'
+import WarningCard from '../../components/WarningCard'
 
 // denominated in bips
 const ALLOWED_SLIPPAGE = ethers.utils.bigNumberify(200)
@@ -144,7 +145,7 @@ function calculateSlippageBounds(value) {
 
 export default function RemoveLiquidity({ params }) {
   const { t } = useTranslation()
-  const { library, account, active } = useWeb3React()
+  const { library, account, active, chainId } = useWeb3React()
 
   const addTransaction = useTransactionAdder()
 
@@ -194,6 +195,11 @@ export default function RemoveLiquidity({ params }) {
   const exchangeETHBalance = useAddressBalance(exchangeAddress, 'ETH')
   const exchangeTokenBalance = useAddressBalance(exchangeAddress, outputCurrency)
 
+  const urlAddedTokens = {}
+  if (params.poolTokenAddress) {
+    urlAddedTokens[params.poolTokenAddress] = true
+  }
+
   // input validation
   useEffect(() => {
     if (valueParsed && poolTokenBalance) {
@@ -355,8 +361,30 @@ export default function RemoveLiquidity({ params }) {
 
   const marketRate = getMarketRate(exchangeETHBalance, exchangeTokenBalance, decimals)
 
+  const newOutputDetected =
+    outputCurrency !== 'ETH' && outputCurrency && !INITIAL_TOKENS_CONTEXT[chainId].hasOwnProperty(outputCurrency)
+
+  const [showCustomTokenWarning, setShowCustomTokenWarning] = useState(false)
+
+  useEffect(() => {
+    if (newOutputDetected) {
+      setShowCustomTokenWarning(true)
+    } else {
+      setShowCustomTokenWarning(false)
+    }
+  }, [newOutputDetected])
+
   return (
     <>
+      {showCustomTokenWarning && (
+        <WarningCard
+          onDismiss={() => {
+            setShowCustomTokenWarning(false)
+          }}
+          urlAddedTokens={urlAddedTokens}
+          currency={outputCurrency}
+        />
+      )}
       <CurrencyInputPanel
         title={t('poolTokens')}
         extraText={poolTokenBalance && formatBalance(amountFormatter(poolTokenBalance, 18, 4))}
@@ -368,6 +396,7 @@ export default function RemoveLiquidity({ params }) {
             }
           }
         }}
+        urlAddedTokens={urlAddedTokens}
         onCurrencySelected={setOutputCurrency}
         onValueChange={setValue}
         value={value}