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Add transferring check to counter exmaple

Jonas Hahn 1 年之前
父節點
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cc589b24eb

+ 3 - 7
tokens/token-2022/transfer-hook/counter/anchor/Anchor.toml

@@ -1,11 +1,6 @@
-[toolchain]
-
-[features]
-seeds = false
-skip-lint = false
 
 [programs.localnet]
-transfer_hook = "DrWbQtYJGtsoRwzKqAbHKHKsCJJfpysudF39GBVFSxub"
+transfer_hook = "1qahDxKHeCLZhbBU2NyMU6vQCQmEUmdeSEBrG5drffK"
 
 [registry]
 url = "https://api.apr.dev"
@@ -15,4 +10,5 @@ cluster = "Localnet"
 wallet = "~/.config/solana/id.json"
 
 [scripts]
-test = "yarn run ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"
+test = "yarn run ts-mocha -p ./tsconfig.json -t 100000 tests/**/*.ts"
+

+ 3 - 1
tokens/token-2022/transfer-hook/counter/anchor/package.json

@@ -10,9 +10,11 @@
   },
   "devDependencies": {
     "@types/bn.js": "^5.1.0",
+    "@types/chai-as-promised": "^7.1.8",
+    "chai-as-promised": "^7.1.2",
     "@types/chai": "^4.3.0",
-    "@types/mocha": "^9.0.0",
     "chai": "^4.3.4",
+    "@types/mocha": "^9.0.0",
     "mocha": "^9.0.3",
     "prettier": "^2.6.2",
     "ts-mocha": "^10.0.0",

+ 0 - 1321
tokens/token-2022/transfer-hook/counter/anchor/pnpm-lock.yaml

@@ -1,1321 +0,0 @@
-lockfileVersion: '6.0'
-
-settings:
-  autoInstallPeers: true
-  excludeLinksFromLockfile: false
-
-dependencies:
-  '@coral-xyz/anchor':
-    specifier: ^0.30.0
-    version: 0.30.0
-  '@solana/spl-token':
-    specifier: ^0.4.0
-    version: 0.4.6(@solana/web3.js@1.91.8)(fastestsmallesttextencoderdecoder@1.0.22)
-  '@solana/web3.js':
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-    version: 1.91.8
-
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-    version: 5.1.5
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-    version: 4.3.16
-  '@types/mocha':
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-    version: 9.1.1
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-    version: 4.4.1
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-    version: 9.2.2
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+ 7 - 2
tokens/token-2022/transfer-hook/counter/anchor/programs/transfer-hook/Cargo.toml

@@ -1,3 +1,7 @@
+[toolchain]
+anchor_version = "0.30.0"
+solana_version = "1.18.15"
+
 [package]
 name = "transfer-hook"
 version = "0.1.0"
@@ -17,7 +21,8 @@ no-log-ix-name = []
 idl-build = ["anchor-lang/idl-build", "anchor-spl/idl-build"]
 
 [dependencies]
-anchor-lang = {version = "0.30.0", features = ["interface-instructions"]}
-anchor-spl = "0.30.0"
+anchor-lang = { git = "https://github.com/coral-xyz/anchor", branch = "master",features = ["interface-instructions"] }
+anchor-spl = { git = "https://github.com/coral-xyz/anchor", branch = "master" }
+solana-program = "1.18.16"
 spl-tlv-account-resolution = "0.6.3"
 spl-transfer-hook-interface = "0.6.3"

+ 69 - 42
tokens/token-2022/transfer-hook/counter/anchor/programs/transfer-hook/src/lib.rs

@@ -1,18 +1,36 @@
+use std::cell::RefMut;
+
 use anchor_lang::prelude::*;
 use anchor_spl::{
-    associated_token::AssociatedToken, token_2022::Token2022, token_interface::{Mint, TokenAccount}
+    associated_token::AssociatedToken,
+    token_2022::{
+        spl_token_2022::{
+            extension::{
+                transfer_hook::TransferHookAccount,
+                BaseStateWithExtensionsMut,
+                PodStateWithExtensionsMut,
+            },
+            pod::PodAccount,
+        },
+        Token2022,
+    },
+    token_interface::{ Mint, TokenAccount },
 };
 use spl_tlv_account_resolution::{
-    account::ExtraAccountMeta, seeds::Seed, state::ExtraAccountMetaList,
+    account::ExtraAccountMeta,
+    seeds::Seed,
+    state::ExtraAccountMetaList,
 };
 use spl_transfer_hook_interface::instruction::ExecuteInstruction;
 
-declare_id!("DrWbQtYJGtsoRwzKqAbHKHKsCJJfpysudF39GBVFSxub");
+declare_id!("1qahDxKHeCLZhbBU2NyMU6vQCQmEUmdeSEBrG5drffK");
 
 #[error_code]
 pub enum MyError {
     #[msg("The amount is too big")]
     AmountTooBig,
+    #[msg("The token is not currently transferring")]
+    IsNotCurrentlyTransferring,
 }
 
 #[program]
@@ -21,14 +39,14 @@ pub mod transfer_hook {
 
     #[interface(spl_transfer_hook_interface::initialize_extra_account_meta_list)]
     pub fn initialize_extra_account_meta_list(
-        ctx: Context<InitializeExtraAccountMetaList>,
+        ctx: Context<InitializeExtraAccountMetaList>
     ) -> Result<()> {
         let extra_account_metas = InitializeExtraAccountMetaList::extra_account_metas()?;
 
         // initialize ExtraAccountMetaList account with extra accounts
         ExtraAccountMetaList::init::<ExecuteInstruction>(
             &mut ctx.accounts.extra_account_meta_list.try_borrow_mut_data()?,
-            &extra_account_metas,
+            &extra_account_metas
         )?;
 
         Ok(())
@@ -36,20 +54,39 @@ pub mod transfer_hook {
 
     #[interface(spl_transfer_hook_interface::execute)]
     pub fn transfer_hook(ctx: Context<TransferHook>, amount: u64) -> Result<()> {
+        // Fail this instruction if it is not called from within a transfer hook
+        check_is_transferring(&ctx)?;
 
+        // Check if the amount is too big
         if amount > 50 {
-            msg!("The amount is too big {0}", amount);
+            msg!("The amount is too big: {}", amount);
             //return err!(MyError::AmountTooBig);
         }
 
-        let count = ctx.accounts.counter_account.counter.checked_add(1).unwrap();
+        // Increment the transfer count safely
+        let count = ctx.accounts.counter_account.counter
+            .checked_add(1)
+            .ok_or(MyError::AmountTooBig)?;
 
         msg!("This token has been transferred {} times", count);
-       
+
         Ok(())
     }
 }
 
+fn check_is_transferring(ctx: &Context<TransferHook>) -> Result<()> {
+    let source_token_info = ctx.accounts.source_token.to_account_info();
+    let mut account_data_ref: RefMut<&mut [u8]> = source_token_info.try_borrow_mut_data()?;
+    let mut account = PodStateWithExtensionsMut::<PodAccount>::unpack(*account_data_ref)?;
+    let account_extension = account.get_extension_mut::<TransferHookAccount>()?;
+
+    if !bool::from(account_extension.transferring) {
+        return err!(MyError::IsNotCurrentlyTransferring);
+    }
+
+    Ok(())
+}
+
 #[derive(Accounts)]
 pub struct InitializeExtraAccountMetaList<'info> {
     #[account(mut)]
@@ -58,20 +95,16 @@ pub struct InitializeExtraAccountMetaList<'info> {
     /// CHECK: ExtraAccountMetaList Account, must use these seeds
     #[account(
         init,
-        seeds = [b"extra-account-metas", mint.key().as_ref()], 
+        seeds = [b"extra-account-metas", mint.key().as_ref()],
         bump,
-        space = ExtraAccountMetaList::size_of(InitializeExtraAccountMetaList::extra_account_metas()?.len())?,
-        payer = payer,
+        space = ExtraAccountMetaList::size_of(
+            InitializeExtraAccountMetaList::extra_account_metas()?.len()
+        )?,
+        payer = payer
     )]
     pub extra_account_meta_list: AccountInfo<'info>,
     pub mint: InterfaceAccount<'info, Mint>,
-    #[account(
-        init,
-        seeds = [b"counter"], 
-        bump,
-        payer = payer,
-        space = 16
-    )]
+    #[account(init, seeds = [b"counter"], bump, payer = payer, space = 16)]
     pub counter_account: Account<'info, CounterAccount>,
     pub token_program: Program<'info, Token2022>,
     pub associated_token_program: Program<'info, AssociatedToken>,
@@ -81,45 +114,39 @@ pub struct InitializeExtraAccountMetaList<'info> {
 // Define extra account metas to store on extra_account_meta_list account
 impl<'info> InitializeExtraAccountMetaList<'info> {
     pub fn extra_account_metas() -> Result<Vec<ExtraAccountMeta>> {
-        Ok(vec![
-            ExtraAccountMeta::new_with_seeds(
-                &[Seed::Literal {
-                    bytes: b"counter".to_vec(),
-                }],
-                false, // is_signer
-                true,  // is_writable
-            )?
-        ])
+        Ok(
+            vec![
+                ExtraAccountMeta::new_with_seeds(
+                    &[
+                        Seed::Literal {
+                            bytes: b"counter".to_vec(),
+                        },
+                    ],
+                    false, // is_signer
+                    true // is_writable
+                )?
+            ]
+        )
     }
 }
+
 // Order of accounts matters for this struct.
 // The first 4 accounts are the accounts required for token transfer (source, mint, destination, owner)
 // Remaining accounts are the extra accounts required from the ExtraAccountMetaList account
 // These accounts are provided via CPI to this program from the token2022 program
 #[derive(Accounts)]
 pub struct TransferHook<'info> {
-    #[account(
-        token::mint = mint, 
-        token::authority = owner,
-    )]
+    #[account(token::mint = mint, token::authority = owner)]
     pub source_token: InterfaceAccount<'info, TokenAccount>,
     pub mint: InterfaceAccount<'info, Mint>,
-    #[account(
-        token::mint = mint,
-    )]
+    #[account(token::mint = mint)]
     pub destination_token: InterfaceAccount<'info, TokenAccount>,
     /// CHECK: source token account owner, can be SystemAccount or PDA owned by another program
     pub owner: UncheckedAccount<'info>,
     /// CHECK: ExtraAccountMetaList Account,
-    #[account(
-        seeds = [b"extra-account-metas", mint.key().as_ref()], 
-        bump
-    )]
+    #[account(seeds = [b"extra-account-metas", mint.key().as_ref()], bump)]
     pub extra_account_meta_list: UncheckedAccount<'info>,
-    #[account(
-        seeds = [b"counter"],
-        bump
-    )]
+    #[account(seeds = [b"counter"], bump)]
     pub counter_account: Account<'info, CounterAccount>,
 }
 

+ 128 - 46
tokens/token-2022/transfer-hook/counter/anchor/tests/transfer-hook.ts

@@ -1,5 +1,5 @@
-import * as anchor from '@coral-xyz/anchor';
-import type { Program } from '@coral-xyz/anchor';
+import * as anchor from "@coral-xyz/anchor";
+import type { Program } from "@coral-xyz/anchor";
 import {
   ASSOCIATED_TOKEN_PROGRAM_ID,
   ExtensionType,
@@ -11,11 +11,25 @@ import {
   createTransferCheckedWithTransferHookInstruction,
   getAssociatedTokenAddressSync,
   getMintLen,
-} from '@solana/spl-token';
-import { Keypair, PublicKey, SystemProgram, Transaction, sendAndConfirmTransaction } from '@solana/web3.js';
-import type { TransferHook } from '../target/types/transfer_hook';
-
-describe('transfer-hook', () => {
+} from "@solana/spl-token";
+import {
+  Keypair,
+  PublicKey,
+  SendTransactionError,
+  SystemProgram,
+  Transaction,
+  sendAndConfirmTransaction,
+} from "@solana/web3.js";
+import type { TransferHook } from "../target/types/transfer_hook";
+import { BN } from "bn.js";
+import { expect } from "chai";
+import chai from "chai";
+import chaiAsPromised from "chai-as-promised";
+import { send } from "process";
+
+chai.use(chaiAsPromised);
+
+describe("transfer-hook", () => {
   // Configure the client to use the local cluster.
   const provider = anchor.AnchorProvider.env();
   anchor.setProvider(provider);
@@ -34,7 +48,7 @@ describe('transfer-hook', () => {
     wallet.publicKey,
     false,
     TOKEN_2022_PROGRAM_ID,
-    ASSOCIATED_TOKEN_PROGRAM_ID,
+    ASSOCIATED_TOKEN_PROGRAM_ID
   );
 
   // Recipient token account address
@@ -44,22 +58,26 @@ describe('transfer-hook', () => {
     recipient.publicKey,
     false,
     TOKEN_2022_PROGRAM_ID,
-    ASSOCIATED_TOKEN_PROGRAM_ID,
+    ASSOCIATED_TOKEN_PROGRAM_ID
   );
 
   // ExtraAccountMetaList address
   // Store extra accounts required by the custom transfer hook instruction
   const [extraAccountMetaListPDA] = PublicKey.findProgramAddressSync(
-    [Buffer.from('extra-account-metas'), mint.publicKey.toBuffer()],
-    program.programId,
+    [Buffer.from("extra-account-metas"), mint.publicKey.toBuffer()],
+    program.programId
   );
 
-  const [counterPDA] = PublicKey.findProgramAddressSync([Buffer.from('counter')], program.programId);
+  const [counterPDA] = PublicKey.findProgramAddressSync(
+    [Buffer.from("counter")],
+    program.programId
+  );
 
-  it('Create Mint Account with Transfer Hook Extension', async () => {
+  it("Create Mint Account with Transfer Hook Extension", async () => {
     const extensions = [ExtensionType.TransferHook];
     const mintLen = getMintLen(extensions);
-    const lamports = await provider.connection.getMinimumBalanceForRentExemption(mintLen);
+    const lamports =
+      await provider.connection.getMinimumBalanceForRentExemption(mintLen);
 
     const transaction = new Transaction().add(
       SystemProgram.createAccount({
@@ -73,19 +91,30 @@ describe('transfer-hook', () => {
         mint.publicKey,
         wallet.publicKey,
         program.programId, // Transfer Hook Program ID
-        TOKEN_2022_PROGRAM_ID,
+        TOKEN_2022_PROGRAM_ID
       ),
-      createInitializeMintInstruction(mint.publicKey, decimals, wallet.publicKey, null, TOKEN_2022_PROGRAM_ID),
+      createInitializeMintInstruction(
+        mint.publicKey,
+        decimals,
+        wallet.publicKey,
+        null,
+        TOKEN_2022_PROGRAM_ID
+      )
     );
 
-    const txSig = await sendAndConfirmTransaction(provider.connection, transaction, [wallet.payer, mint], {
-      skipPreflight: true,
-      commitment: 'finalized',
-    });
+    const txSig = await sendAndConfirmTransaction(
+      provider.connection,
+      transaction,
+      [wallet.payer, mint],
+      {
+        skipPreflight: true,
+        commitment: "finalized",
+      }
+    );
 
     const txDetails = await program.provider.connection.getTransaction(txSig, {
       maxSupportedTransactionVersion: 0,
-      commitment: 'confirmed',
+      commitment: "confirmed",
     });
     console.log(txDetails.meta.logMessages);
 
@@ -94,7 +123,7 @@ describe('transfer-hook', () => {
 
   // Create the two token accounts for the transfer-hook enabled mint
   // Fund the sender token account with 100 tokens
-  it('Create Token Accounts and Mint Tokens', async () => {
+  it("Create Token Accounts and Mint Tokens", async () => {
     // 100 tokens
     const amount = 100 * 10 ** decimals;
 
@@ -105,7 +134,7 @@ describe('transfer-hook', () => {
         wallet.publicKey,
         mint.publicKey,
         TOKEN_2022_PROGRAM_ID,
-        ASSOCIATED_TOKEN_PROGRAM_ID,
+        ASSOCIATED_TOKEN_PROGRAM_ID
       ),
       createAssociatedTokenAccountInstruction(
         wallet.publicKey,
@@ -113,18 +142,30 @@ describe('transfer-hook', () => {
         recipient.publicKey,
         mint.publicKey,
         TOKEN_2022_PROGRAM_ID,
-        ASSOCIATED_TOKEN_PROGRAM_ID,
+        ASSOCIATED_TOKEN_PROGRAM_ID
       ),
-      createMintToInstruction(mint.publicKey, sourceTokenAccount, wallet.publicKey, amount, [], TOKEN_2022_PROGRAM_ID),
+      createMintToInstruction(
+        mint.publicKey,
+        sourceTokenAccount,
+        wallet.publicKey,
+        amount,
+        [],
+        TOKEN_2022_PROGRAM_ID
+      )
     );
 
-    const txSig = await sendAndConfirmTransaction(connection, transaction, [wallet.payer], { skipPreflight: true });
+    const txSig = await sendAndConfirmTransaction(
+      connection,
+      transaction,
+      [wallet.payer],
+      { skipPreflight: true }
+    );
 
     console.log(`Transaction Signature: ${txSig}`);
   });
 
   // Account to store extra accounts required by the transfer hook instruction
-  it('Create ExtraAccountMetaList Account', async () => {
+  it("Create ExtraAccountMetaList Account", async () => {
     const initializeExtraAccountMetaListInstruction = await program.methods
       .initializeExtraAccountMetaList()
       .accounts({
@@ -132,37 +173,78 @@ describe('transfer-hook', () => {
       })
       .instruction();
 
-    const transaction = new Transaction().add(initializeExtraAccountMetaListInstruction);
+    const transaction = new Transaction().add(
+      initializeExtraAccountMetaListInstruction
+    );
 
-    const txSig = await sendAndConfirmTransaction(provider.connection, transaction, [wallet.payer], { skipPreflight: true, commitment: 'confirmed' });
-    console.log('Transaction Signature:', txSig);
+    const txSig = await sendAndConfirmTransaction(
+      provider.connection,
+      transaction,
+      [wallet.payer],
+      { skipPreflight: true, commitment: "confirmed" }
+    );
+    console.log("Transaction Signature:", txSig);
   });
 
-  it('Transfer Hook with Extra Account Meta', async () => {
+  it("Transfer Hook with Extra Account Meta", async () => {
     // 1 tokens
     const amount = 1 * 10 ** decimals;
     const amountBigInt = BigInt(amount);
 
-    const transferInstructionWithHelper = await createTransferCheckedWithTransferHookInstruction(
-      connection,
-      sourceTokenAccount,
-      mint.publicKey,
-      destinationTokenAccount,
-      wallet.publicKey,
-      amountBigInt,
-      decimals,
-      [],
-      'confirmed',
-      TOKEN_2022_PROGRAM_ID,
-    );
+    const transferInstructionWithHelper =
+      await createTransferCheckedWithTransferHookInstruction(
+        connection,
+        sourceTokenAccount,
+        mint.publicKey,
+        destinationTokenAccount,
+        wallet.publicKey,
+        amountBigInt,
+        decimals,
+        [],
+        "confirmed",
+        TOKEN_2022_PROGRAM_ID
+      );
 
     console.log(`Extra accounts meta: ${extraAccountMetaListPDA}`);
     console.log(`Counter PDA: ${counterPDA}`);
-    console.log(`Transfer Instruction: ${JSON.stringify(transferInstructionWithHelper, null, 2)}`);
+    console.log(
+      `Transfer Instruction: ${JSON.stringify(transferInstructionWithHelper)}`
+    );
 
     const transaction = new Transaction().add(transferInstructionWithHelper);
 
-    const txSig = await sendAndConfirmTransaction(connection, transaction, [wallet.payer], { skipPreflight: true });
-    console.log('Transfer Signature:', txSig);
+    const txSig = await sendAndConfirmTransaction(
+      connection,
+      transaction,
+      [wallet.payer],
+      { skipPreflight: true }
+    );
+    console.log("Transfer Signature:", txSig);
+  });
+
+  it("Try call transfer hook without transfer", async () => {
+    const transferHookIx = await program.methods
+      .transferHook(new BN(1))
+      .accounts({
+        sourceToken: sourceTokenAccount,
+        mint: mint.publicKey,
+        destinationToken: destinationTokenAccount,
+        owner: wallet.publicKey,
+      })
+      .instruction();
+
+    const transaction = new Transaction().add(transferHookIx);
+
+    const sendPromise = sendAndConfirmTransaction(
+      connection,
+      transaction,
+      [wallet.payer],
+      { skipPreflight: false }
+    );
+
+    await expect(sendPromise).to.eventually.be.rejectedWith(
+      SendTransactionError,
+      /Number: 6001./
+    );
   });
 });

+ 35 - 27
tokens/token-2022/transfer-hook/hello-world/anchor/programs/transfer-hook/src/lib.rs

@@ -1,18 +1,22 @@
 use anchor_lang::prelude::*;
 use anchor_spl::{
-    associated_token::AssociatedToken, token_interface::{
+    associated_token::AssociatedToken,
+    token_interface::{
         spl_pod::optional_keys::OptionalNonZeroPubkey,
         spl_token_2022::{
             extension::{
-                transfer_hook::TransferHook as TransferHookExtension, BaseStateWithExtensions,
+                transfer_hook::TransferHook as TransferHookExtension,
+                BaseStateWithExtensions,
                 StateWithExtensions,
             },
             state::Mint as MintState,
         },
-        Mint, Token2022, TokenAccount
+        Mint,
+        Token2022,
+        TokenAccount,
     },
 };
-use spl_tlv_account_resolution::{account::ExtraAccountMeta, state::ExtraAccountMetaList};
+use spl_tlv_account_resolution::{ account::ExtraAccountMeta, state::ExtraAccountMetaList };
 use spl_transfer_hook_interface::instruction::ExecuteInstruction;
 
 declare_id!("jY5DfVksJT8Le38LCaQhz5USeiGu4rUeVSS8QRAMoba");
@@ -29,22 +33,23 @@ pub mod transfer_hook {
 
     #[interface(spl_transfer_hook_interface::initialize_extra_account_meta_list)]
     pub fn initialize_extra_account_meta_list(
-        ctx: Context<InitializeExtraAccountMetaList>,
+        ctx: Context<InitializeExtraAccountMetaList>
     ) -> Result<()> {
         let extra_account_metas = InitializeExtraAccountMetaList::extra_account_metas()?;
 
         // initialize ExtraAccountMetaList account with extra accounts
         ExtraAccountMetaList::init::<ExecuteInstruction>(
             &mut ctx.accounts.extra_account_meta_list.try_borrow_mut_data()?,
-            &extra_account_metas,
+            &extra_account_metas
         )?;
 
-
         Ok(())
     }
 
     #[interface(spl_transfer_hook_interface::execute)]
     pub fn transfer_hook(_ctx: Context<TransferHook>, _amount: u64) -> Result<()> {
+        // Fail this instruction if it is not called from within a transfer hook
+        check_is_transferring(&ctx)?;
 
         msg!("Hello Transfer Hook!");
 
@@ -52,6 +57,19 @@ pub mod transfer_hook {
     }
 }
 
+fn check_is_transferring(ctx: &Context<TransferHook>) -> Result<()> {
+    let source_token_info = ctx.accounts.source_token.to_account_info();
+    let mut account_data_ref: RefMut<&mut [u8]> = source_token_info.try_borrow_mut_data()?;
+    let mut account = PodStateWithExtensionsMut::<PodAccount>::unpack(*account_data_ref)?;
+    let account_extension = account.get_extension_mut::<TransferHookAccount>()?;
+
+    if !bool::from(account_extension.transferring) {
+        return err!(MyError::IsNotCurrentlyTransferring);
+    }
+
+    Ok(())
+}
+
 #[derive(Accounts)]
 #[instruction(_decimals: u8)]
 pub struct Initialize<'info> {
@@ -64,7 +82,7 @@ pub struct Initialize<'info> {
         mint::decimals = _decimals,
         mint::authority = payer,
         extensions::transfer_hook::authority = payer,
-        extensions::transfer_hook::program_id = crate::ID,
+        extensions::transfer_hook::program_id = crate::ID
     )]
     pub mint_account: InterfaceAccount<'info, Mint>,
     pub token_program: Program<'info, Token2022>,
@@ -84,17 +102,13 @@ impl<'info> Initialize<'info> {
             OptionalNonZeroPubkey::try_from(Some(self.payer.key()))?
         );
 
-        assert_eq!(
-            extension_data.program_id,
-            OptionalNonZeroPubkey::try_from(Some(crate::ID))?
-        );
+        assert_eq!(extension_data.program_id, OptionalNonZeroPubkey::try_from(Some(crate::ID))?);
 
         msg!("{:?}", extension_data);
         Ok(())
     }
 }
 
-
 #[derive(Accounts)]
 pub struct InitializeExtraAccountMetaList<'info> {
     #[account(mut)]
@@ -103,10 +117,12 @@ pub struct InitializeExtraAccountMetaList<'info> {
     /// CHECK: ExtraAccountMetaList Account, must use these seeds
     #[account(
         init,
-        seeds = [b"extra-account-metas", mint.key().as_ref()], 
+        seeds = [b"extra-account-metas", mint.key().as_ref()],
         bump,
-        space = ExtraAccountMetaList::size_of(InitializeExtraAccountMetaList::extra_account_metas()?.len())?,
-        payer = payer,
+        space = ExtraAccountMetaList::size_of(
+            InitializeExtraAccountMetaList::extra_account_metas()?.len()
+        )?,
+        payer = payer
     )]
     pub extra_account_meta_list: UncheckedAccount<'info>,
     pub mint: InterfaceAccount<'info, Mint>,
@@ -129,22 +145,14 @@ impl<'info> InitializeExtraAccountMetaList<'info> {
 // These accounts are provided via CPI to this program from the token2022 program
 #[derive(Accounts)]
 pub struct TransferHook<'info> {
-    #[account(
-        token::mint = mint, 
-        token::authority = owner,
-    )]
+    #[account(token::mint = mint, token::authority = owner)]
     pub source_token: InterfaceAccount<'info, TokenAccount>,
     pub mint: InterfaceAccount<'info, Mint>,
-    #[account(
-        token::mint = mint,
-    )]
+    #[account(token::mint = mint)]
     pub destination_token: InterfaceAccount<'info, TokenAccount>,
     /// CHECK: source token account owner, can be SystemAccount or PDA owned by another program
     pub owner: UncheckedAccount<'info>,
     /// CHECK: ExtraAccountMetaList Account,
-    #[account(
-        seeds = [b"extra-account-metas", mint.key().as_ref()], 
-        bump
-    )]
+    #[account(seeds = [b"extra-account-metas", mint.key().as_ref()], bump)]
     pub extra_account_meta_list: UncheckedAccount<'info>,
 }