From 9a84556c5328dc4d094e5c869eb59f1f2324260b Mon Sep 17 00:00:00 2001
From: aureliusbtc <82057759+aureliusbtc@users.noreply.github.com>
Date: Tue, 16 Jul 2024 09:33:23 -0400
Subject: [PATCH] FE LiFi: Revoke approvals  (#2874)

* Init lifi approval revoke page

* get rid of victim address and use connected address

* Add some text

* Only show approval data once connected

* Multi-chain checker
---
 .../synapse-interface/pages/lifi/index.tsx    | 147 ++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 packages/synapse-interface/pages/lifi/index.tsx

diff --git a/packages/synapse-interface/pages/lifi/index.tsx b/packages/synapse-interface/pages/lifi/index.tsx
new file mode 100644
index 0000000000..954f130751
--- /dev/null
+++ b/packages/synapse-interface/pages/lifi/index.tsx
@@ -0,0 +1,147 @@
+import Grid from '@tw/Grid'
+import { useEffect, useState } from 'react'
+import { useAccount, useAccountEffect, useSwitchChain } from 'wagmi'
+
+
+import { LandingPageWrapper } from '@layouts/LandingPageWrapper'
+import StandardPageContainer from '@layouts/StandardPageContainer'
+import { getErc20TokenAllowance } from '@/actions/getErc20TokenAllowance'
+import { approveToken } from '@/utils/approveToken'
+import { TransactionButton } from '@/components/buttons/TransactionButton'
+import { useConnectModal } from '@rainbow-me/rainbowkit'
+
+const CHAIN_IDS = [1, 42161, 10]
+const LIFI_SPENDER = "0x1231deb6f5749ef6ce6943a275a1d3e7486f4eae"
+
+const TOKENS = {
+  USDC: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
+  USDT: '0xdac17f958d2ee523a2206206994597c13d831ec7',
+  WETH: '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2'
+} as const;
+
+interface TokenAllowances {
+  [chainId: number]: {
+    [token: string]: bigint
+  }
+}
+
+const LifiPage = () => {
+  const { address, isConnected, chain } = useAccount()
+  const { chains, switchChain: switchNetwork } = useSwitchChain()
+  const { openConnectModal } = useConnectModal()
+
+  const [allowances, setAllowances] = useState<TokenAllowances>({})
+
+  useEffect(() => {
+    const fetchAllowances = async () => {
+      if (address) {
+        const newAllowances: TokenAllowances = {}
+
+        for (const chainId of CHAIN_IDS) {
+          newAllowances[chainId] = {}
+
+          for (const [tokenName, tokenAddress] of Object.entries(TOKENS)) {
+            const allowance = await getErc20TokenAllowance({
+              address,
+              chainId,
+              tokenAddress,
+              spender: LIFI_SPENDER,
+            })
+            newAllowances[chainId][tokenName] = allowance
+          }
+        }
+
+        setAllowances(newAllowances)
+      }
+    }
+
+    if (isConnected) {
+      fetchAllowances()
+    }
+  }, [address, isConnected])
+
+  const handleRevoke = async (chainId: number, tokenName: string, tokenAddress: string) => {
+    if (chain?.id !== chainId) {
+      await switchNetwork({chainId: chainId})
+    }
+    await approveToken(LIFI_SPENDER, chainId, tokenAddress, 0n)
+    setAllowances(prev => ({
+      ...prev,
+      [chainId]: {
+        ...prev[chainId],
+        [tokenName]: 0n
+      }
+    }))
+  }
+
+  return (
+    <LandingPageWrapper>
+      <StandardPageContainer
+        connectedChainId={chain?.id}
+        address={address}
+      >
+        <div className="flex justify-between">
+          <div>
+            <div className="text-2xl text-white">
+              Revoke Li.fi Approvals (Multi-chain)
+            </div>
+          </div>
+        </div>
+        <div className="py-6">
+          <Grid
+            cols={{ xs: 1 }}
+            gap={6}
+            className="justify-center px-2 py-16 sm:px-6 md:px-8"
+          >
+            <div className="pb-3 place-self-center">
+              <div>
+                <h3>Li.fi / Jumper is investigating an ongoing exploit, and users should revoke approvals <a className="underline" target="_blank" href="https://x.com/lifiprotocol/status/1813196697641570635">- Li.fi Tweet</a></h3>
+                <br />
+                <h3>Check to see if you have any approvals at risk below:</h3>
+                <br />
+                {isConnected ? (
+                  CHAIN_IDS.map(chainId => (
+                    <div key={chainId}>
+                      <h4>Chain ID: {chainId}</h4>
+                      {Object.entries(allowances[chainId] || {}).map(([tokenName, allowance]) => (
+                        <div key={tokenName}>
+                          {tokenName} Allowance: {allowance.toString()}
+                          {allowance > 0n && (
+                            <TransactionButton
+                              className="btn btn-primary ml-2"
+                              pendingLabel="Revoking..."
+                              label={`Revoke ${tokenName} Approval`}
+                              onClick={() => handleRevoke(chainId, tokenName, TOKENS[tokenName])}
+                            />
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  ))
+                ) : (
+                  <div className="flex flex-col justify-center h-full p-10">
+                    <TransactionButton
+                      style={{
+                        background: 'linear-gradient(90deg, rgba(128, 0, 255, 0.2) 0%, rgba(255, 0, 191, 0.2) 100%)',
+                        border: '1px solid #9B6DD7',
+                        borderRadius: '4px',
+                      }}
+                      label="Connect wallet to check for approvals"
+                      pendingLabel="Connecting"
+                      onClick={() => new Promise((resolve) => {
+                        openConnectModal()
+                        resolve(true)
+                      })}
+                    />
+                  </div>
+                )}
+              </div>
+            </div>
+          </Grid>
+        </div>
+      </StandardPageContainer>
+    </LandingPageWrapper>
+  )
+}
+
+export default LifiPage