Add a button to delete token accounts

src/components/BalancesList.js

@@ -21,6 +21,7 @@ import { abbreviateAddress } from '../utils/utils';
 import Button from '@material-ui/core/Button';
 import SendIcon from '@material-ui/icons/Send';
 import ReceiveIcon from '@material-ui/icons/WorkOutline';
+import DeleteIcon from '@material-ui/icons/Delete';
 import AppBar from '@material-ui/core/AppBar';
 import Toolbar from '@material-ui/core/Toolbar';
 import AddIcon from '@material-ui/icons/Add';
@@ -36,6 +37,7 @@ import {
   useSolanaExplorerUrlSuffix,
 } from '../utils/connection';
 import { showTokenInfoDialog } from '../utils/config';
+import CloseTokenAccountDialog from './CloseTokenAccountButton';
 
 const balanceFormat = new Intl.NumberFormat(undefined, {
   minimumFractionDigits: 4,
@@ -150,12 +152,16 @@ function BalanceListItemDetails({ publicKey, balanceInfo }) {
   const [sendDialogOpen, setSendDialogOpen] = useState(false);
   const [depositDialogOpen, setDepositDialogOpen] = useState(false);
   const [tokenInfoDialogOpen, setTokenInfoDialogOpen] = useState(false);
+  const [
+    closeTokenAccountDialogOpen,
+    setCloseTokenAccountDialogOpen,
+  ] = useState(false);
 
   if (!balanceInfo) {
     return <LoadingIndicator delay={0} />;
   }
 
-  let { mint, tokenName, tokenSymbol, owner } = balanceInfo;
+  let { mint, tokenName, tokenSymbol, owner, amount } = balanceInfo;
 
   return (
     <>
@@ -187,6 +193,17 @@ function BalanceListItemDetails({ publicKey, balanceInfo }) {
           >
             Send
           </Button>
+          {mint && amount === 0 ? (
+            <Button
+              variant="outlined"
+              color="secondary"
+              size="small"
+              startIcon={<DeleteIcon />}
+              onClick={() => setCloseTokenAccountDialogOpen(true)}
+            >
+              Delete
+            </Button>
+          ) : null}
         </div>
         <Typography variant="body2" className={classes.address}>
           Deposit Address: {publicKey.toBase58()}
@@ -233,6 +250,12 @@ function BalanceListItemDetails({ publicKey, balanceInfo }) {
         balanceInfo={balanceInfo}
         publicKey={publicKey}
       />
+      <CloseTokenAccountDialog
+        open={closeTokenAccountDialogOpen}
+        onClose={() => setCloseTokenAccountDialogOpen(false)}
+        balanceInfo={balanceInfo}
+        publicKey={publicKey}
+      />
     </>
   );
 }

src/components/CloseTokenAccountButton.js

@@ -0,0 +1,52 @@
+import DialogForm from './DialogForm';
+import DialogTitle from '@material-ui/core/DialogTitle';
+import DialogContent from '@material-ui/core/DialogContent';
+import { DialogContentText } from '@material-ui/core';
+import { abbreviateAddress } from '../utils/utils';
+import DialogActions from '@material-ui/core/DialogActions';
+import Button from '@material-ui/core/Button';
+import React from 'react';
+import { useSendTransaction } from '../utils/notifications';
+import { refreshWalletPublicKeys, useWallet } from '../utils/wallet';
+
+export default function CloseTokenAccountDialog({
+  open,
+  onClose,
+  publicKey,
+  balanceInfo,
+}) {
+  const wallet = useWallet();
+  const [sendTransaction, sending] = useSendTransaction();
+  const { mint, tokenName } = balanceInfo;
+
+  function onSubmit() {
+    sendTransaction(wallet.closeTokenAccount(publicKey), {
+      onSuccess: () => {
+        refreshWalletPublicKeys(wallet);
+        onClose();
+      },
+    });
+  }
+
+  return (
+    <DialogForm open={open} onClose={onClose} onSubmit={onSubmit}>
+      <DialogTitle>
+        Delete {tokenName ?? mint.toBase58()} Address{' '}
+        {abbreviateAddress(publicKey)}
+      </DialogTitle>
+      <DialogContent>
+        <DialogContentText>
+          Are you sure you want to delete your {tokenName ?? mint.toBase58()}{' '}
+          address {publicKey.toBase58()}? This will permanently disable token
+          transfers to this address and remove it from your wallet.
+        </DialogContentText>
+      </DialogContent>
+      <DialogActions>
+        <Button onClick={onClose}>Cancel</Button>
+        <Button type="submit" color="secondary" disabled={sending}>
+          Delete
+        </Button>
+      </DialogActions>
+    </DialogForm>
+  );
+}

src/utils/connection.js

@@ -59,13 +59,15 @@ export function useAccountInfo(publicKey) {
     if (!publicKey) {
       return;
     }
-    let previousData = null;
+    let previousInfo = null;
     const id = connection.onAccountChange(publicKey, (info) => {
-      if (info.data) {
+      if (
-        if (!previousData || !previousData.equals(info.data)) {
+        !previousInfo ||
-          previousData = info.data;
+        !previousInfo.data.equals(info.data) ||
-          setCache(cacheKey, info);
+        previousInfo.lamports !== info.lamports
-        }
+      ) {
+        previousInfo = info;
+        setCache(cacheKey, info);
       }
     });
     return () => connection.removeAccountChangeListener(id);

src/utils/tokens/index.js

@@ -1,5 +1,6 @@
 import { PublicKey, SystemProgram, Transaction } from '@solana/web3.js';
 import {
+  closeAccount,
   initializeAccount,
   initializeMint,
   memoInstruction,
@@ -173,3 +174,21 @@ export async function transferTokens({
     preflightCommitment: 'single',
   });
 }
+
+export async function closeTokenAccount({
+  connection,
+  owner,
+  sourcePublicKey,
+}) {
+  let transaction = new Transaction().add(
+    closeAccount({
+      source: sourcePublicKey,
+      destination: owner.publicKey,
+      owner: owner.publicKey,
+    }),
+  );
+  let signers = [owner];
+  return await connection.sendTransaction(transaction, signers, {
+    preflightCommitment: 'single',
+  });
+}

src/utils/tokens/instructions.js

@@ -44,6 +44,7 @@ LAYOUT.addVariant(
   BufferLayout.struct([BufferLayout.nu64('amount')]),
   'burn',
 );
+LAYOUT.addVariant(9, BufferLayout.struct([]), 'closeAccount');
 
 const instructionMaxSpan = Math.max(
   ...Object.values(LAYOUT.registry).map((r) => r.span),
@@ -127,6 +128,21 @@ export function mintTo({ mint, destination, amount, mintAuthority }) {
   });
 }
 
+export function closeAccount({ source, destination, owner }) {
+  const keys = [
+    { pubkey: source, isSigner: false, isWritable: true },
+    { pubkey: destination, isSigner: false, isWritable: true },
+    { pubkey: owner, isSigner: true, isWritable: false },
+  ];
+  return new TransactionInstruction({
+    keys,
+    data: encodeTokenInstructionData({
+      closeAccount: {},
+    }),
+    programId: TOKEN_PROGRAM_ID,
+  });
+}
+
 export function memoInstruction(memo) {
   return new TransactionInstruction({
     keys: [],

src/utils/wallet.js

@@ -8,6 +8,7 @@ import {
   useConnection,
 } from './connection';
 import {
+  closeTokenAccount,
   createAndInitializeTokenAccount,
   getOwnedTokenAccounts,
   transferTokens,
@@ -97,6 +98,14 @@ export class Wallet {
       preflightCommitment: 'single',
     });
   };
+
+  closeTokenAccount = async (publicKey) => {
+    return await closeTokenAccount({
+      connection: this.connection,
+      owner: this.account,
+      sourcePublicKey: publicKey,
+    });
+  };
 }
 
 const WalletContext = React.createContext(null);