Add Custom url parameters (#423)

* query params for input and output currencies

* add slippage option

* add slippage cusytom param

* updated for sender address

* add field and amount support

* update params for pool page

* finish basic url support

* update app format

* update error checking to top level

* update for all pages

* fix build

* param updates

* fix slippage to basis points, update theme text, refactor to minimize lookups

* fix code styles

* update theme logic, remove extra setting, update rounding

* remove eslint comment errors

* remove logs, ignore lock

* remove lock

.gitignore

@@ -27,3 +27,5 @@ notes.txt
 .idea/
 
 .vscode/
+
+package-lock.json

package.json

@@ -10,6 +10,7 @@
     "@uniswap/sdk": "^1.0.0-beta.4",
     "copy-to-clipboard": "^3.2.0",
     "escape-string-regexp": "^2.0.0",
+    "history": "^4.9.0",
     "ethers": "^4.0.36",
     "i18next": "^15.0.9",
     "i18next-browser-languagedetector": "^3.0.1",

src/components/AddressInputPanel/index.js

@@ -75,7 +75,8 @@ export default function AddressInputPanel({ title, initialInput = '', onChange =
 
   const { library } = useWeb3Context()
 
-  const [input, setInput] = useState(initialInput)
+  const [input, setInput] = useState(initialInput.address ? initialInput.address : '')
+
   const debouncedInput = useDebounce(input, 150)
 
   const [data, setData] = useState({ address: undefined, name: undefined })

src/components/CurrencyInputPanel/index.js

@@ -336,9 +336,9 @@ export default function CurrencyInputPanel({
         <Input
           type="number"
           min="0"
+          step="0.000000000000000001"
           error={!!errorMessage}
           placeholder="0.0"
-          step="0.000000000000000001"
           onChange={e => onValueChange(e.target.value)}
           onKeyPress={e => {
             const charCode = e.which ? e.which : e.keyCode

src/components/ExchangePage/index.jsx

@@ -1,5 +1,6 @@
 import React, { useState, useReducer, useEffect } from 'react'
 import ReactGA from 'react-ga'
+import { createBrowserHistory } from 'history'
 
 import { useTranslation } from 'react-i18next'
 import { useWeb3Context } from 'web3-react'
@@ -119,13 +120,17 @@ function calculateEtherTokenInputFromOutput(outputAmount, inputReserve, outputRe
   return numerator.div(denominator).add(ethers.constants.One)
 }
 
-function getInitialSwapState(outputCurrency) {
+function getInitialSwapState(state) {
   return {
-    independentValue: '', // this is a user input
+    independentValue: state.exactFieldURL && state.exactAmountURL ? state.exactAmountURL : '', // this is a user input
     dependentValue: '', // this is a calculated number
-    independentField: INPUT,
+    independentField: state.exactFieldURL === 'output' ? OUTPUT : INPUT,
-    inputCurrency: 'ETH',
+    inputCurrency: state.inputCurrencyURL ? state.inputCurrencyURL : 'ETH',
-    outputCurrency: outputCurrency ? outputCurrency : ''
+    outputCurrency: state.outputCurrencyURL
+      ? state.outputCurrencyURL
+      : state.initialCurrency
+      ? state.initialCurrency
+      : ''
   }
 }
 
@@ -235,14 +240,32 @@ function getMarketRate(
   }
 }
 
-export default function ExchangePage({ initialCurrency, sending }) {
+export default function ExchangePage({ initialCurrency, sending = false, params }) {
   const { t } = useTranslation()
   const { account } = useWeb3Context()
 
   const addTransaction = useTransactionAdder()
 
-  const [rawSlippage, setRawSlippage] = useState(ALLOWED_SLIPPAGE_DEFAULT)
+  // check if URL specifies valid slippage, if so use as default
-  const [rawTokenSlippage, setRawTokenSlippage] = useState(TOKEN_ALLOWED_SLIPPAGE_DEFAULT)
+  const initialSlippage = (token = false) => {
+    let slippage = Number.parseInt(params.slippage)
+    if (!isNaN(slippage) && (slippage === 0 || slippage >= 1)) {
+      return slippage // round to match custom input availability
+    }
+    // check for token <-> token slippage option
+    return token ? TOKEN_ALLOWED_SLIPPAGE_DEFAULT : ALLOWED_SLIPPAGE_DEFAULT
+  }
+
+  // check URL params for recipient, only on send page
+  const initialRecipient = () => {
+    if (sending && params.recipient) {
+      return params.recipient
+    }
+    return ''
+  }
+
+  const [rawSlippage, setRawSlippage] = useState(() => initialSlippage())
+  const [rawTokenSlippage, setRawTokenSlippage] = useState(() => initialSlippage(true))
 
   const allowedSlippageBig = ethers.utils.bigNumberify(rawSlippage)
   const tokenAllowedSlippageBig = ethers.utils.bigNumberify(rawTokenSlippage)
@@ -253,11 +276,21 @@ export default function ExchangePage({ initialCurrency, sending }) {
   }, [])
 
   // core swap state
-  const [swapState, dispatchSwapState] = useReducer(swapStateReducer, initialCurrency, getInitialSwapState)
+  const [swapState, dispatchSwapState] = useReducer(
+    swapStateReducer,
+    {
+      initialCurrency: initialCurrency,
+      inputCurrencyURL: params.inputCurrency,
+      outputCurrencyURL: params.outputCurrency,
+      exactFieldURL: params.exactField,
+      exactAmountURL: params.exactAmount
+    },
+    getInitialSwapState
+  )
 
   const { independentValue, dependentValue, independentField, inputCurrency, outputCurrency } = swapState
 
-  const [recipient, setRecipient] = useState({ address: '', name: '' })
+  const [recipient, setRecipient] = useState({ address: initialRecipient(), name: '' })
   const [recipientError, setRecipientError] = useState()
 
   // get swap type from the currency types
@@ -468,6 +501,11 @@ export default function ExchangePage({ initialCurrency, sending }) {
     t
   ])
 
+  useEffect(() => {
+    const history = createBrowserHistory()
+    history.push(window.location.pathname + '')
+  }, [])
+
   const [inverted, setInverted] = useState(false)
   const exchangeRate = getExchangeRate(inputValueParsed, inputDecimals, outputValueParsed, outputDecimals)
   const exchangeRateInverted = getExchangeRate(inputValueParsed, inputDecimals, outputValueParsed, outputDecimals, true)
@@ -655,7 +693,7 @@ export default function ExchangePage({ initialCurrency, sending }) {
               <DownArrow active={isValid} alt="arrow" />
             </DownArrowBackground>
           </OversizedPanel>
-          <AddressInputPanel onChange={setRecipient} onError={setRecipientError} />
+          <AddressInputPanel onChange={setRecipient} onError={setRecipientError} initialInput={recipient} />
         </>
       ) : (
         ''

src/components/TransactionDetails/index.js

@@ -1,4 +1,4 @@
-import React, { useState, useEffect, useRef } from 'react'
+import React, { useState, useEffect, useRef, useCallback } from 'react'
 import ReactGA from 'react-ga'
 import { useTranslation } from 'react-i18next'
 import styled, { css, keyframes } from 'styled-components'
@@ -502,40 +502,94 @@ export default function TransactionDetails(props) {
     checkBounds(debouncedInput)
   }
 
+  // destructure props for to limit effect callbacks
+  const setRawSlippage = props.setRawSlippage
+  const setRawTokenSlippage = props.setRawTokenSlippage
+  const setcustomSlippageError = props.setcustomSlippageError
+
+  const updateSlippage = useCallback(
+    newSlippage => {
+      // round to 2 decimals to prevent ethers error
+      let numParsed = parseInt(newSlippage * 100)
+
+      // set both slippage values in parents
+      setRawSlippage(numParsed)
+      setRawTokenSlippage(numParsed)
+    },
+    [setRawSlippage, setRawTokenSlippage]
+  )
+
   // used for slippage presets
-  const setFromFixed = (index, slippage) => {
+  const setFromFixed = useCallback(
+    (index, slippage) => {
       // update slippage in parent, reset errors and input state
       updateSlippage(slippage)
       setWarningType(WARNING_TYPE.none)
       setActiveIndex(index)
-    props.setcustomSlippageError('valid`')
+      setcustomSlippageError('valid`')
-  }
+    },
+    [setcustomSlippageError, updateSlippage]
+  )
 
-  const checkBounds = slippageValue => {
+  /**
+   * @todo
+   * Breaks without useState here, able to
+   * break input parsing if typing is faster than
+   * debounce time
+   */
+
+  const [initialSlippage] = useState(props.rawSlippage)
+
+  useEffect(() => {
+    switch (Number.parseInt(initialSlippage)) {
+      case 10:
+        setFromFixed(1, 0.1)
+        break
+      case 50:
+        setFromFixed(2, 0.5)
+        break
+      case 100:
+        setFromFixed(3, 1)
+        break
+      default:
+        // restrict to 2 decimal places
+        let acceptableValues = [/^$/, /^\d{1,2}$/, /^\d{0,2}\.\d{0,2}$/]
+        // if its within accepted decimal limit, update the input state
+        if (acceptableValues.some(val => val.test(initialSlippage / 100))) {
+          setUserInput(initialSlippage / 100)
+          setActiveIndex(4)
+        }
+    }
+  }, [initialSlippage, setFromFixed])
+
+  const checkBounds = useCallback(
+    slippageValue => {
       setWarningType(WARNING_TYPE.none)
-    props.setcustomSlippageError('valid')
+      setcustomSlippageError('valid')
 
       if (slippageValue === '' || slippageValue === '.') {
-      props.setcustomSlippageError('invalid')
+        setcustomSlippageError('invalid')
         return setWarningType(WARNING_TYPE.emptyInput)
       }
 
       // check bounds and set errors
       if (Number(slippageValue) < 0 || Number(slippageValue) > 50) {
-      props.setcustomSlippageError('invalid')
+        setcustomSlippageError('invalid')
         return setWarningType(WARNING_TYPE.invalidEntryBound)
       }
       if (Number(slippageValue) >= 0 && Number(slippageValue) < 0.1) {
-      props.setcustomSlippageError('valid')
+        setcustomSlippageError('valid')
         setWarningType(WARNING_TYPE.riskyEntryLow)
       }
       if (Number(slippageValue) > 5) {
-      props.setcustomSlippageError('warning')
+        setcustomSlippageError('warning')
         setWarningType(WARNING_TYPE.riskyEntryHigh)
       }
       //update the actual slippage value in parent
       updateSlippage(Number(slippageValue))
-  }
+    },
+    [setcustomSlippageError, updateSlippage]
+  )
 
   // check that the theyve entered number and correct decimal
   const parseInput = e => {
@@ -549,15 +603,6 @@ export default function TransactionDetails(props) {
     }
   }
 
-  const updateSlippage = newSlippage => {
-    // round to 2 decimals to prevent ethers error
-    let numParsed = parseInt(newSlippage * 100)
-
-    // set both slippage values in parents
-    props.setRawSlippage(numParsed)
-    props.setRawTokenSlippage(numParsed)
-  }
-
   const b = text => <Bold>{text}</Bold>
 
   const renderTransactionDetails = () => {

src/constants/index.js

@@ -4,3 +4,8 @@ export const FACTORY_ADDRESSES = {
   4: '0xf5D915570BC477f9B8D6C0E980aA81757A3AaC36',
   42: '0xD3E51Ef092B2845f10401a0159B2B96e8B6c3D30'
 }
+
+export const SUPPORTED_THEMES = {
+  DARK: 'DARK',
+  LIGHT: 'LIGHT'
+}

src/contexts/AllBalances.js

@@ -68,14 +68,12 @@ export function useFetchAllBalances() {
         Object.keys(allTokens).map(async k => {
           let balance = null
           let ethRate = null
-
           if (isAddress(k) || k === 'ETH') {
             if (k === 'ETH') {
               balance = await getEtherBalance(account, library).catch(() => null)
               ethRate = ONE
             } else {
               balance = await getTokenBalance(k, account, library).catch(() => null)
-
               // only get values for tokens with positive balances
               if (!!balance && balance.gt(ZERO)) {
                 const tokenReserves = await getTokenReserves(k, library).catch(() => null)

src/contexts/LocalStorage.js

@@ -95,11 +95,14 @@ export function useBetaMessageManager() {
 export function useDarkModeManager() {
   const [state, { updateKey }] = useLocalStorageContext()
 
-  const isDarkMode = state[DARK_MODE]
+  let isDarkMode = state[DARK_MODE]
 
-  const toggleDarkMode = useCallback(() => {
+  const toggleDarkMode = useCallback(
-    updateKey(DARK_MODE, !isDarkMode)
+    value => {
-  }, [updateKey, isDarkMode])
+      updateKey(DARK_MODE, value === false || value === true ? value : !isDarkMode)
+    },
+    [updateKey, isDarkMode]
+  )
 
   return [state[DARK_MODE], toggleDarkMode]
 }

src/pages/App.js

@@ -7,7 +7,7 @@ import Header from '../components/Header'
 import Footer from '../components/Footer'
 
 import NavigationTabs from '../components/NavigationTabs'
-import { isAddress } from '../utils'
+import { isAddress, getAllQueryParams } from '../utils'
 
 const Swap = lazy(() => import('./Swap'))
 const Send = lazy(() => import('./Send'))
@@ -48,6 +48,7 @@ const Body = styled.div`
 `
 
 export default function App() {
+  const params = getAllQueryParams()
   return (
     <>
       <Suspense fallback={null}>
@@ -63,27 +64,33 @@ export default function App() {
                   {/* this Suspense is for route code-splitting */}
                   <Suspense fallback={null}>
                     <Switch>
-                      <Route exact strict path="/swap" component={Swap} />
+                      <Route exact strict path="/swap" component={() => <Swap params={params} />} />
                       <Route
                         exact
                         strict
                         path="/swap/:tokenAddress?"
-                        render={({ match }) => {
+                        render={({ match, location }) => {
                           if (isAddress(match.params.tokenAddress)) {
-                            return <Swap initialCurrency={isAddress(match.params.tokenAddress)} />
+                            return (
+                              <Swap
+                                location={location}
+                                initialCurrency={isAddress(match.params.tokenAddress)}
+                                params={params}
+                              />
+                            )
                           } else {
                             return <Redirect to={{ pathname: '/swap' }} />
                           }
                         }}
                       />
-                      <Route exact strict path="/send" component={Send} />
+                      <Route exact strict path="/send" component={() => <Send params={params} />} />
                       <Route
                         exact
                         strict
                         path="/send/:tokenAddress?"
-                        render={({ match }) => {
+                        render={({ match, location }) => {
                           if (isAddress(match.params.tokenAddress)) {
-                            return <Send initialCurrency={isAddress(match.params.tokenAddress)} />
+                            return <Send initialCurrency={isAddress(match.params.tokenAddress)} params={params} />
                           } else {
                             return <Redirect to={{ pathname: '/send' }} />
                           }
@@ -96,7 +103,7 @@ export default function App() {
                           '/create-exchange',
                           '/create-exchange/:tokenAddress?'
                         ]}
-                        component={Pool}
+                        component={() => <Pool params={params} />}
                       />
                       <Redirect to="/swap" />
                     </Switch>

src/pages/Pool/AddLiquidity.js

@@ -1,6 +1,7 @@
 import React, { useReducer, useState, useCallback, useEffect, useMemo } from 'react'
 import { useTranslation } from 'react-i18next'
 import { useWeb3Context } from 'web3-react'
+import { createBrowserHistory } from 'history'
 import { ethers } from 'ethers'
 import ReactGA from 'react-ga'
 import styled from 'styled-components'
@@ -118,11 +119,13 @@ function calculateSlippageBounds(value) {
   }
 }
 
-const initialAddLiquidityState = {
+function initialAddLiquidityState(state) {
-  inputValue: '',
+  return {
-  outputValue: '',
+    inputValue: state.ethAmountURL ? state.ethAmountURL : '',
-  lastEditedField: INPUT,
+    outputValue: state.tokenAmountURL && !state.ethAmountURL ? state.tokenAmountURL : '',
-  outputCurrency: ''
+    lastEditedField: state.tokenAmountURL && state.ethAmountURL === '' ? OUTPUT : INPUT,
+    outputCurrency: state.tokenURL ? state.tokenURL : ''
+  }
 }
 
 function addLiquidityStateReducer(state, action) {
@@ -153,7 +156,7 @@ function addLiquidityStateReducer(state, action) {
       }
     }
     default: {
-      return initialAddLiquidityState
+      return initialAddLiquidityState()
     }
   }
 }
@@ -189,11 +192,21 @@ function getMarketRate(reserveETH, reserveToken, decimals, invert = false) {
   return getExchangeRate(reserveETH, 18, reserveToken, decimals, invert)
 }
 
-export default function AddLiquidity() {
+export default function AddLiquidity({ params }) {
   const { t } = useTranslation()
   const { library, active, account } = useWeb3Context()
 
-  const [addLiquidityState, dispatchAddLiquidityState] = useReducer(addLiquidityStateReducer, initialAddLiquidityState)
+  // clear url of query
+  useEffect(() => {
+    const history = createBrowserHistory()
+    history.push(window.location.pathname + '')
+  }, [])
+
+  const [addLiquidityState, dispatchAddLiquidityState] = useReducer(
+    addLiquidityStateReducer,
+    { ethAmountURL: params.ethAmount, tokenAmountURL: params.tokenAmount, tokenURL: params.token },
+    initialAddLiquidityState
+  )
   const { inputValue, outputValue, lastEditedField, outputCurrency } = addLiquidityState
   const inputCurrency = 'ETH'
 

src/pages/Pool/CreateExchange.js

@@ -1,11 +1,11 @@
 import React, { useState, useEffect } from 'react'
 import { withRouter } from 'react-router'
 import { useWeb3Context } from 'web3-react'
+import { createBrowserHistory } from 'history'
 import { ethers } from 'ethers'
 import styled from 'styled-components'
 import { useTranslation } from 'react-i18next'
 import ReactGA from 'react-ga'
-
 import { Button } from '../../theme'
 import AddressInputPanel from '../../components/AddressInputPanel'
 import OversizedPanel from '../../components/OversizedPanel'
@@ -54,13 +54,13 @@ const Flex = styled.div`
   }
 `
 
-function CreateExchange({ history, location }) {
+function CreateExchange({ location, params }) {
   const { t } = useTranslation()
   const { account } = useWeb3Context()
   const factory = useFactoryContract()
 
   const [tokenAddress, setTokenAddress] = useState({
-    address: '',
+    address: params.tokenAddress ? params.tokenAddress : '',
     name: ''
   })
   const [tokenAddressError, setTokenAddressError] = useState()
@@ -68,12 +68,11 @@ function CreateExchange({ history, location }) {
   const { name, symbol, decimals, exchangeAddress } = useTokenDetails(tokenAddress.address)
   const addTransaction = useTransactionAdder()
 
-  // clear location state, if it exists
+  // clear url of query
   useEffect(() => {
-    if (location.state) {
+    const history = createBrowserHistory()
-      history.replace(location.pathname)
+    history.push(window.location.pathname + '')
-    }
+  }, [])
-  }, []) // eslint-disable-line react-hooks/exhaustive-deps
 
   // validate everything
   const [errorMessage, setErrorMessage] = useState(!account && t('noWallet'))
@@ -118,7 +117,11 @@ function CreateExchange({ history, location }) {
     <>
       <AddressInputPanel
         title={t('tokenAddress')}
-        initialInput={(location.state && location.state.tokenAddress) || ''}
+        initialInput={
+          params.tokenAddress
+            ? { address: params.tokenAddress }
+            : { address: (location.state && location.state.tokenAddress) || '' }
+        }
         onChange={setTokenAddress}
         onError={setTokenAddressError}
       />

src/pages/Pool/RemoveLiquidity.js

@@ -1,6 +1,7 @@
 import React, { useState, useEffect, useCallback } from 'react'
 import { useTranslation } from 'react-i18next'
 import ReactGA from 'react-ga'
+import { createBrowserHistory } from 'history'
 import { useWeb3Context } from 'web3-react'
 import { ethers } from 'ethers'
 import styled from 'styled-components'
@@ -141,14 +142,20 @@ function calculateSlippageBounds(value) {
   }
 }
 
-export default function RemoveLiquidity() {
+export default function RemoveLiquidity({ params }) {
   const { library, account, active } = useWeb3Context()
   const { t } = useTranslation()
 
   const addTransaction = useTransactionAdder()
 
-  const [outputCurrency, setOutputCurrency] = useState('')
+  // clear url of query
-  const [value, setValue] = useState('')
+  useEffect(() => {
+    const history = createBrowserHistory()
+    history.push(window.location.pathname + '')
+  }, [])
+
+  const [outputCurrency, setOutputCurrency] = useState(params.poolTokenAddress)
+  const [value, setValue] = useState(params.poolTokenAmount ? params.poolTokenAmount : '')
   const [inputError, setInputError] = useState()
   const [valueParsed, setValueParsed] = useState()
   // parse value

src/pages/Pool/index.js

@@ -1,27 +1,32 @@
 import React, { Suspense, lazy, useEffect } from 'react'
 import ReactGA from 'react-ga'
 import { Switch, Route, Redirect } from 'react-router-dom'
-
 import ModeSelector from './ModeSelector'
 
 const AddLiquidity = lazy(() => import('./AddLiquidity'))
 const RemoveLiquidity = lazy(() => import('./RemoveLiquidity'))
 const CreateExchange = lazy(() => import('./CreateExchange'))
 
-export default function Pool() {
+export default function Pool({ params }) {
   useEffect(() => {
     ReactGA.pageview(window.location.pathname + window.location.search)
   }, [])
 
+  const AddLiquidityParams = () => <AddLiquidity params={params} />
+
+  const RemoveLiquidityParams = () => <RemoveLiquidity params={params} />
+
+  const CreateExchangeParams = () => <CreateExchange params={params} />
+
   return (
     <>
       <ModeSelector />
       {/* this Suspense is for route code-splitting */}
       <Suspense fallback={null}>
         <Switch>
-          <Route exact strict path="/add-liquidity" component={AddLiquidity} />
+          <Route exact strict path="/add-liquidity" component={AddLiquidityParams} />
-          <Route exact strict path="/remove-liquidity" component={RemoveLiquidity} />
+          <Route exact strict path="/remove-liquidity" component={RemoveLiquidityParams} />
-          <Route exact strict path="/create-exchange" component={CreateExchange} />
+          <Route exact strict path="/create-exchange" component={CreateExchangeParams} />
           <Route
             path="/create-exchange/:tokenAddress"
             render={({ match }) => {

src/pages/Send/index.js

@@ -1,6 +1,6 @@
 import React from 'react'
 import ExchangePage from '../../components/ExchangePage'
 
-export default function Send({ initialCurrency }) {
+export default function Send({ initialCurrency, params }) {
-  return <ExchangePage initialCurrency={initialCurrency} sending={true} />
+  return <ExchangePage initialCurrency={initialCurrency} params={params} sending={true} />
 }

src/pages/Swap/index.js

@@ -1,6 +1,6 @@
 import React from 'react'
 import ExchangePage from '../../components/ExchangePage'
 
-export default function Swap({ initialCurrency }) {
+export default function Swap({ initialCurrency, params }) {
-  return <ExchangePage initialCurrency={initialCurrency} />
+  return <ExchangePage initialCurrency={initialCurrency} params={params} />
 }

src/theme/index.js

@@ -1,5 +1,7 @@
-import React from 'react'
+import React, { useEffect } from 'react'
 import { ThemeProvider as StyledComponentsThemeProvider, createGlobalStyle, css } from 'styled-components'
+import { getQueryParam, checkSupportedTheme } from '../utils'
+import { SUPPORTED_THEMES } from '../constants'
 import { useDarkModeManager } from '../contexts/LocalStorage'
 
 export * from './components'
@@ -32,6 +34,22 @@ const flexRowNoWrap = css`
 const white = '#FFFFFF'
 const black = '#000000'
 
+export default function ThemeProvider({ children }) {
+  const [darkMode, toggleDarkMode] = useDarkModeManager()
+  const themeURL = checkSupportedTheme(getQueryParam(window.location, 'theme'))
+  const themeToRender = themeURL
+    ? themeURL.toUpperCase() === SUPPORTED_THEMES.DARK
+      ? true
+      : themeURL.toUpperCase() === SUPPORTED_THEMES.LIGHT
+      ? false
+      : darkMode
+    : darkMode
+  useEffect(() => {
+    toggleDarkMode(themeToRender)
+  }, [toggleDarkMode, themeToRender])
+  return <StyledComponentsThemeProvider theme={theme(themeToRender)}>{children}</StyledComponentsThemeProvider>
+}
+
 const theme = darkMode => ({
   white,
   black,
@@ -84,12 +102,6 @@ const theme = darkMode => ({
   flexRowNoWrap
 })
 
-export default function ThemeProvider({ children }) {
-  const [darkMode] = useDarkModeManager()
-
-  return <StyledComponentsThemeProvider theme={theme(darkMode)}>{children}</StyledComponentsThemeProvider>
-}
-
 export const GlobalStyle = createGlobalStyle`
   @import url('https://rsms.me/inter/inter.css');
   html { font-family: 'Inter', sans-serif; }

src/utils/index.js

@@ -4,7 +4,7 @@ import FACTORY_ABI from '../constants/abis/factory'
 import EXCHANGE_ABI from '../constants/abis/exchange'
 import ERC20_ABI from '../constants/abis/erc20'
 import ERC20_BYTES32_ABI from '../constants/abis/erc20_bytes32'
-import { FACTORY_ADDRESSES } from '../constants'
+import { FACTORY_ADDRESSES, SUPPORTED_THEMES } from '../constants'
 import { formatFixed } from '@uniswap/sdk'
 
 import UncheckedJsonRpcSigner from './signer'
@@ -33,6 +33,7 @@ const ETHERSCAN_PREFIXES = {
   5: 'goerli.',
   42: 'kovan.'
 }
+
 export function getEtherscanLink(networkId, data, type) {
   const prefix = `https://${ETHERSCAN_PREFIXES[networkId] || ETHERSCAN_PREFIXES[1]}etherscan.io`
 
@@ -47,6 +48,63 @@ export function getEtherscanLink(networkId, data, type) {
   }
 }
 
+export function getQueryParam(windowLocation, name) {
+  var q = windowLocation.search.match(new RegExp('[?&]' + name + '=([^&#?]*)'))
+  return q && q[1]
+}
+
+export function getAllQueryParams() {
+  let params = {}
+  params.theme = checkSupportedTheme(getQueryParam(window.location, 'theme'))
+
+  params.inputCurrency = isAddress(getQueryParam(window.location, 'inputCurrency'))
+    ? getQueryParam(window.location, 'inputCurrency')
+    : ''
+  params.outputCurrency = isAddress(getQueryParam(window.location, 'outputCurrency'))
+    ? getQueryParam(window.location, 'outputCurrency')
+    : ''
+  params.slippage = !isNaN(getQueryParam(window.location, 'slippage')) ? getQueryParam(window.location, 'slippage') : ''
+  params.exactField = getQueryParam(window.location, 'exactField')
+  params.exactAmount = !isNaN(getQueryParam(window.location, 'exactAmount'))
+    ? getQueryParam(window.location, 'exactAmount')
+    : ''
+  params.theme = checkSupportedTheme(getQueryParam(window.location, 'theme'))
+  params.recipient = isAddress(getQueryParam(window.location, 'recipient'))
+    ? getQueryParam(window.location, 'recipient')
+    : ''
+
+  // Add Liquidity params
+  params.ethAmount = !isNaN(getQueryParam(window.location, 'ethAmount'))
+    ? getQueryParam(window.location, 'ethAmount')
+    : ''
+  params.tokenAmount = !isNaN(getQueryParam(window.location, 'tokenAmount'))
+    ? getQueryParam(window.location, 'tokenAmount')
+    : ''
+  params.token = isAddress(getQueryParam(window.location, 'token')) ? getQueryParam(window.location, 'token') : ''
+
+  // Remove liquidity params
+  params.poolTokenAmount = !isNaN(getQueryParam(window.location, 'poolTokenAmount'))
+    ? getQueryParam(window.location, 'poolTokenAmount')
+    : ''
+  params.poolTokenAddress = isAddress(getQueryParam(window.location, 'poolTokenAddress'))
+    ? getQueryParam(window.location, 'poolTokenAddress')
+    : ''
+
+  // Create Exchange params
+  params.tokenAddress = isAddress(getQueryParam(window.location, 'tokenAddress'))
+    ? getQueryParam(window.location, 'tokenAddress')
+    : ''
+
+  return params
+}
+
+export function checkSupportedTheme(themeName) {
+  if (themeName && themeName.toUpperCase() in SUPPORTED_THEMES) {
+    return themeName.toUpperCase()
+  }
+  return null
+}
+
 export function getNetworkName(networkId) {
   switch (networkId) {
     case 1: {