Example on how to use account data as seeds (#111)

* Example on how to use account data as seeds

* Update pnpm-lock.yaml

* Update readme.md

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/.gitignore

@@ -0,0 +1,8 @@
+
+.anchor
+.DS_Store
+target
+**/*.rs.bk
+node_modules
+test-ledger
+.yarn

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/.prettierignore

@@ -0,0 +1,8 @@
+
+.anchor
+.DS_Store
+target
+node_modules
+dist
+build
+test-ledger

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/.prettierrc

@@ -0,0 +1,10 @@
+{
+  "tabWidth": 2,
+  "useTabs": false,
+  "singleQuote": false,
+  "printWidth": 80,
+  "trailingComma": "all",
+  "arrowParens": "avoid",
+  "endOfLine": "auto",
+  "proseWrap": "always"
+}

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/Anchor.toml

@@ -0,0 +1,13 @@
+
+[programs.localnet]
+transfer_hook = "1qahDxKHeCLZhbBU2NyMU6vQCQmEUmdeSEBrG5drffK"
+
+[registry]
+url = "https://api.apr.dev"
+
+[provider]
+cluster = "Localnet"
+wallet = "~/.config/solana/id.json"
+
+[scripts]
+test = "pnpm ts-mocha -p ./tsconfig.json -t 100000 tests/**/*.ts"

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/Cargo.toml

@@ -0,0 +1,14 @@
+[workspace]
+members = [
+    "programs/*"
+]
+resolver = "2"
+
+[profile.release]
+overflow-checks = true
+lto = "fat"
+codegen-units = 1
+[profile.release.build-override]
+opt-level = 3
+incremental = false
+codegen-units = 1

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/migrations/deploy.ts

@@ -0,0 +1,12 @@
+// Migrations are an early feature. Currently, they're nothing more than this
+// single deploy script that's invoked from the CLI, injecting a provider
+// configured from the workspace's Anchor.toml.
+
+const anchor = require('@coral-xyz/anchor');
+
+module.exports = async (provider) => {
+  // Configure client to use the provider.
+  anchor.setProvider(provider);
+
+  // Add your deploy script here.
+};

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/package.json

@@ -0,0 +1,23 @@
+{
+  "scripts": {
+    "lint:fix": "prettier */*.js \"*/**/*{.js,.ts}\" -w",
+    "lint": "prettier */*.js \"*/**/*{.js,.ts}\" --check"
+  },
+  "dependencies": {
+    "@coral-xyz/anchor": "^0.30.1",
+    "@solana/spl-token": "^0.4.0",
+    "@solana/web3.js": "^1.92.3"
+  },
+  "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",
+    "chai": "^4.3.4",
+    "@types/mocha": "^9.0.0",
+    "mocha": "^9.0.3",
+    "prettier": "^2.6.2",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^4.3.5"
+  }
+}

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/pnpm-lock.yaml

@@ -0,0 +1,1544 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    dependencies:
+      '@coral-xyz/anchor':
+        specifier: ^0.30.1
+        version: 0.30.1(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+      '@solana/spl-token':
+        specifier: ^0.4.0
+        version: 0.4.6(@solana/web3.js@1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10))(bufferutil@4.0.8)(fastestsmallesttextencoderdecoder@1.0.22)(utf-8-validate@5.0.10)
+      '@solana/web3.js':
+        specifier: ^1.92.3
+        version: 1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+    devDependencies:
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+        version: 5.1.5
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+      typescript:
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+
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+      '@solana/web3.js': 1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+    transitivePeerDependencies:
+      - fastestsmallesttextencoderdecoder
+
+  '@solana/spl-token@0.4.6(@solana/web3.js@1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10))(bufferutil@4.0.8)(fastestsmallesttextencoderdecoder@1.0.22)(utf-8-validate@5.0.10)':
+    dependencies:
+      '@solana/buffer-layout': 4.0.1
+      '@solana/buffer-layout-utils': 0.2.0(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+      '@solana/spl-token-group': 0.0.4(@solana/web3.js@1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10))(fastestsmallesttextencoderdecoder@1.0.22)
+      '@solana/spl-token-metadata': 0.1.4(@solana/web3.js@1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10))(fastestsmallesttextencoderdecoder@1.0.22)
+      '@solana/web3.js': 1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+      buffer: 6.0.3
+    transitivePeerDependencies:
+      - bufferutil
+      - encoding
+      - fastestsmallesttextencoderdecoder
+      - utf-8-validate
+
+  '@solana/spl-type-length-value@0.1.0':
+    dependencies:
+      buffer: 6.0.3
+
+  '@solana/web3.js@1.92.3(bufferutil@4.0.8)(utf-8-validate@5.0.10)':
+    dependencies:
+      '@babel/runtime': 7.24.7
+      '@noble/curves': 1.4.0
+      '@noble/hashes': 1.4.0
+      '@solana/buffer-layout': 4.0.1
+      agentkeepalive: 4.5.0
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+      borsh: 0.7.0
+      bs58: 4.0.1
+      buffer: 6.0.3
+      fast-stable-stringify: 1.0.0
+      jayson: 4.1.0(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+      node-fetch: 2.7.0
+      rpc-websockets: 8.0.1
+      superstruct: 1.0.4
+    transitivePeerDependencies:
+      - bufferutil
+      - encoding
+      - utf-8-validate
+
+  '@types/bn.js@5.1.5':
+    dependencies:
+      '@types/node': 20.12.11
+
+  '@types/chai-as-promised@7.1.8':
+    dependencies:
+      '@types/chai': 4.3.16
+
+  '@types/chai@4.3.16': {}
+
+  '@types/connect@3.4.38':
+    dependencies:
+      '@types/node': 20.12.11
+
+  '@types/json5@0.0.29':
+    optional: true
+
+  '@types/mocha@9.1.1': {}
+
+  '@types/node@12.20.55': {}
+
+  '@types/node@20.12.11':
+    dependencies:
+      undici-types: 5.26.5
+
+  '@types/ws@7.4.7':
+    dependencies:
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+
+  '@ungap/promise-all-settled@1.1.2': {}
+
+  JSONStream@1.3.5:
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+    optional: true
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+  chai@4.4.1:
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+      check-error: 1.0.3
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+      get-func-name: 2.0.2
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+      pathval: 1.1.1
+      type-detect: 4.0.8
+
+  chalk@4.1.2:
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+      supports-color: 7.2.0
+
+  chalk@5.3.0: {}
+
+  check-error@1.0.3:
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+
+  chokidar@3.5.3:
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+      braces: 3.0.2
+      glob-parent: 5.1.2
+      is-binary-path: 2.1.0
+      is-glob: 4.0.3
+      normalize-path: 3.0.0
+      readdirp: 3.6.0
+    optionalDependencies:
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+
+  cliui@7.0.4:
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+    transitivePeerDependencies:
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+
+  crypto-hash@1.3.0: {}
+
+  debug@4.3.3(supports-color@8.1.1):
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+    optionalDependencies:
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+
+  decamelize@4.0.0: {}
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+  deep-eql@4.1.3:
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+  dot-case@3.0.4:
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+  emoji-regex@8.0.0: {}
+
+  es6-promise@4.2.8: {}
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+  es6-promisify@5.0.0:
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+      path-exists: 4.0.0
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+      inflight: 1.0.6
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+  growl@1.10.5: {}
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+  has-flag@4.0.0: {}
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+
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+      wrappy: 1.0.2
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+  inherits@2.0.4: {}
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+  is-binary-path@2.1.0:
+    dependencies:
+      binary-extensions: 2.3.0
+
+  is-extglob@2.1.1: {}
+
+  is-fullwidth-code-point@3.0.0: {}
+
+  is-glob@4.0.3:
+    dependencies:
+      is-extglob: 2.1.1
+
+  is-number@7.0.0: {}
+
+  is-plain-obj@2.1.0: {}
+
+  is-unicode-supported@0.1.0: {}
+
+  isexe@2.0.0: {}
+
+  isomorphic-ws@4.0.1(ws@7.5.9(bufferutil@4.0.8)(utf-8-validate@5.0.10)):
+    dependencies:
+      ws: 7.5.9(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+
+  jayson@4.1.0(bufferutil@4.0.8)(utf-8-validate@5.0.10):
+    dependencies:
+      '@types/connect': 3.4.38
+      '@types/node': 12.20.55
+      '@types/ws': 7.4.7
+      JSONStream: 1.3.5
+      commander: 2.20.3
+      delay: 5.0.0
+      es6-promisify: 5.0.0
+      eyes: 0.1.8
+      isomorphic-ws: 4.0.1(ws@7.5.9(bufferutil@4.0.8)(utf-8-validate@5.0.10))
+      json-stringify-safe: 5.0.1
+      uuid: 8.3.2
+      ws: 7.5.9(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+    transitivePeerDependencies:
+      - bufferutil
+      - utf-8-validate
+
+  js-yaml@4.1.0:
+    dependencies:
+      argparse: 2.0.1
+
+  json-stringify-safe@5.0.1: {}
+
+  json5@1.0.2:
+    dependencies:
+      minimist: 1.2.8
+    optional: true
+
+  jsonparse@1.3.1: {}
+
+  locate-path@6.0.0:
+    dependencies:
+      p-locate: 5.0.0
+
+  log-symbols@4.1.0:
+    dependencies:
+      chalk: 4.1.2
+      is-unicode-supported: 0.1.0
+
+  loupe@2.3.7:
+    dependencies:
+      get-func-name: 2.0.2
+
+  lower-case@2.0.2:
+    dependencies:
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+  make-error@1.3.6: {}
+
+  minimatch@3.1.2:
+    dependencies:
+      brace-expansion: 1.1.11
+
+  minimatch@4.2.1:
+    dependencies:
+      brace-expansion: 1.1.11
+
+  minimist@1.2.8: {}
+
+  mkdirp@0.5.6:
+    dependencies:
+      minimist: 1.2.8
+
+  mocha@9.2.2:
+    dependencies:
+      '@ungap/promise-all-settled': 1.1.2
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+      browser-stdout: 1.3.1
+      chokidar: 3.5.3
+      debug: 4.3.3(supports-color@8.1.1)
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+      glob: 7.2.0
+      growl: 1.10.5
+      he: 1.2.0
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+      log-symbols: 4.1.0
+      minimatch: 4.2.1
+      ms: 2.1.3
+      nanoid: 3.3.1
+      serialize-javascript: 6.0.0
+      strip-json-comments: 3.1.1
+      supports-color: 8.1.1
+      which: 2.0.2
+      workerpool: 6.2.0
+      yargs: 16.2.0
+      yargs-parser: 20.2.4
+      yargs-unparser: 2.0.0
+
+  ms@2.1.2: {}
+
+  ms@2.1.3: {}
+
+  nanoid@3.3.1: {}
+
+  no-case@3.0.4:
+    dependencies:
+      lower-case: 2.0.2
+      tslib: 2.6.2
+
+  node-fetch@2.7.0:
+    dependencies:
+      whatwg-url: 5.0.0
+
+  node-gyp-build@4.8.1:
+    optional: true
+
+  normalize-path@3.0.0: {}
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+      wrappy: 1.0.2
+
+  p-limit@3.1.0:
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+  picomatch@2.3.1: {}
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+    dependencies:
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+  rpc-websockets@8.0.1:
+    dependencies:
+      eventemitter3: 4.0.7
+      uuid: 8.3.2
+      ws: 8.17.0(bufferutil@4.0.8)(utf-8-validate@5.0.10)
+    optionalDependencies:
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+      utf-8-validate: 5.0.10
+
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+
+  serialize-javascript@6.0.0:
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+    dependencies:
+      emoji-regex: 8.0.0
+      is-fullwidth-code-point: 3.0.0
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+
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+    dependencies:
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+
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+    optional: true
+
+  strip-json-comments@3.1.1: {}
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+  supports-color@7.2.0:
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+      has-flag: 4.0.0
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+    dependencies:
+      has-flag: 4.0.0
+
+  text-encoding-utf-8@1.0.2: {}
+
+  through@2.3.8: {}
+
+  to-regex-range@5.0.1:
+    dependencies:
+      is-number: 7.0.0
+
+  toml@3.0.0: {}
+
+  tr46@0.0.3: {}
+
+  ts-mocha@10.0.0(mocha@9.2.2):
+    dependencies:
+      mocha: 9.2.2
+      ts-node: 7.0.1
+    optionalDependencies:
+      tsconfig-paths: 3.15.0
+
+  ts-node@7.0.1:
+    dependencies:
+      arrify: 1.0.1
+      buffer-from: 1.1.2
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+      source-map-support: 0.5.21
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+
+  tsconfig-paths@3.15.0:
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+      json5: 1.0.2
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+      strip-bom: 3.0.0
+    optional: true
+
+  tslib@2.6.2: {}
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+  type-detect@4.0.8: {}
+
+  typescript@4.9.5: {}
+
+  undici-types@5.26.5: {}
+
+  utf-8-validate@5.0.10:
+    dependencies:
+      node-gyp-build: 4.8.1
+    optional: true
+
+  uuid@8.3.2: {}
+
+  webidl-conversions@3.0.1: {}
+
+  whatwg-url@5.0.0:
+    dependencies:
+      tr46: 0.0.3
+      webidl-conversions: 3.0.1
+
+  which@2.0.2:
+    dependencies:
+      isexe: 2.0.0
+
+  workerpool@6.2.0: {}
+
+  wrap-ansi@7.0.0:
+    dependencies:
+      ansi-styles: 4.3.0
+      string-width: 4.2.3
+      strip-ansi: 6.0.1
+
+  wrappy@1.0.2: {}
+
+  ws@7.5.9(bufferutil@4.0.8)(utf-8-validate@5.0.10):
+    optionalDependencies:
+      bufferutil: 4.0.8
+      utf-8-validate: 5.0.10
+
+  ws@8.17.0(bufferutil@4.0.8)(utf-8-validate@5.0.10):
+    optionalDependencies:
+      bufferutil: 4.0.8
+      utf-8-validate: 5.0.10
+
+  y18n@5.0.8: {}
+
+  yargs-parser@20.2.4: {}
+
+  yargs-unparser@2.0.0:
+    dependencies:
+      camelcase: 6.3.0
+      decamelize: 4.0.0
+      flat: 5.0.2
+      is-plain-obj: 2.1.0
+
+  yargs@16.2.0:
+    dependencies:
+      cliui: 7.0.4
+      escalade: 3.1.2
+      get-caller-file: 2.0.5
+      require-directory: 2.1.1
+      string-width: 4.2.3
+      y18n: 5.0.8
+      yargs-parser: 20.2.4
+
+  yn@2.0.0: {}
+
+  yocto-queue@0.1.0: {}

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/programs/transfer-hook/Cargo.toml

@@ -0,0 +1,28 @@
+[toolchain]
+anchor_version = "0.30.1"
+solana_version = "2.0.3"
+
+[package]
+name = "transfer-hook"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "transfer_hook"
+
+[features]
+default = []
+cpi = ["no-entrypoint"]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+idl-build = ["anchor-lang/idl-build", "anchor-spl/idl-build"]
+
+[dependencies]
+anchor-lang = { version = "0.30.1", features = ["interface-instructions"] }
+anchor-spl = "0.30.1"
+solana-program = "=1.18.21"
+spl-tlv-account-resolution = "0.6.0"
+spl-transfer-hook-interface = "0.6.0"

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/programs/transfer-hook/Xargo.toml

@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/programs/transfer-hook/src/lib.rs

@@ -0,0 +1,157 @@
+use std::cell::RefMut;
+
+use anchor_lang::{ prelude::* };
+use anchor_spl::{
+    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,
+};
+use spl_transfer_hook_interface::instruction::ExecuteInstruction;
+
+declare_id!("1qahDxKHeCLZhbBU2NyMU6vQCQmEUmdeSEBrG5drffK");
+
+#[error_code]
+pub enum TransferError {
+    #[msg("The amount is too big")]
+    AmountTooBig,
+    #[msg("The token is not currently transferring")]
+    IsNotCurrentlyTransferring,
+}
+
+#[program]
+pub mod transfer_hook {
+    use super::*;
+
+    #[interface(spl_transfer_hook_interface::initialize_extra_account_meta_list)]
+    pub fn initialize_extra_account_meta_list(
+        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
+        )?;
+
+        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)?;
+
+        // Check if the amount is too big
+        if amount > 50 {
+            msg!("The amount is too big: {}", amount);
+            //return err!(TransferError::AmountTooBig);
+        }
+
+        // Increment the transfer count safely
+        let count = ctx.accounts.counter_account.counter
+            .checked_add(1)
+            .ok_or(TransferError::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!(TransferError::IsNotCurrentlyTransferring);
+    }
+
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct InitializeExtraAccountMetaList<'info> {
+    #[account(mut)]
+    payer: Signer<'info>,
+
+    /// CHECK: ExtraAccountMetaList Account, must use these seeds
+    #[account(
+        init,
+        seeds = [b"extra-account-metas", mint.key().as_ref()],
+        bump,
+        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", payer.key().as_ref()], bump, payer = payer, space = 16)]
+    pub counter_account: Account<'info, CounterAccount>,
+    pub token_program: Program<'info, Token2022>,
+    pub associated_token_program: Program<'info, AssociatedToken>,
+    pub system_program: Program<'info, System>,
+}
+
+// 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(),
+                        },
+                        Seed::AccountData { account_index: 0, data_index: 32, length: 32 },
+                    ],
+                    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)]
+    pub source_token: InterfaceAccount<'info, TokenAccount>,
+    pub mint: InterfaceAccount<'info, 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)]
+    pub extra_account_meta_list: UncheckedAccount<'info>,
+    #[account(seeds = [b"counter", owner.key().as_ref()], bump)]
+    pub counter_account: Account<'info, CounterAccount>,
+}
+
+#[account]
+pub struct CounterAccount {
+    counter: u64,
+}

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/readme.md

@@ -0,0 +1,155 @@
+# Using token account data in transfer hook
+
+Sometimes you may want to use account data to derive additional accounts in the
+extra account metas. This is useful if, for example, you want to use the token
+account's owner as a seed for a PDA.
+
+When creating the ExtraAccountMeta you can use the data of any account as an
+extra seed. In this case we want to derive a counter account from the token
+account owner and the string 'counter'. This means we will be always able to see
+how often that token account owner has transferred tokens.
+
+This is how you set it up in the `extra_account_metas()` function.
+
+```rust
+// 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(),
+                        },
+                        Seed::AccountData { account_index: 0, data_index: 32, length: 32 },
+                    ],
+                    false, // is_signer
+                    true // is_writable
+                )?
+            ]
+        )
+    }
+}
+```
+
+Let's look at the token account struct to understand how the account data is
+stored. Below is an example of a token account structure. So we can take 32
+bytes at position 32 to 64 as the owner of the token account, which is at
+'account_index: 0'. 'account_index` refers to the index of the account in the
+accounts array. In the case of a transfer hook, the owner token account is the
+first entry in the accounts array. The second account is always the mint and the
+third account is the destination token account. This account order is the same
+as in the old token program.
+
+```rust
+/// Account data.
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+pub struct Account {
+    /// The mint associated with this account
+    pub mint: Pubkey,
+    /// The owner of this account.
+    pub owner: Pubkey,
+    /// The amount of tokens this account holds.
+    pub amount: u64,
+    pub delegate: COption<Pubkey>,
+    pub state: AccountState,
+    pub is_native: COption<u64>,
+    pub delegated_amount: u64,
+    pub close_authority: COption<Pubkey>,
+}
+```
+
+I our case we want to derive a counter account from the owner of the sender
+token account so when we create the ExtraAccountMeta accounts we `init`this PDA
+counter account that is derived from the sender token account owner and the
+string 'counter'. When the PDA counter account is initialized we will be able to
+use it with in the transfer hook to increase it in every transfer.
+
+```rust
+#[derive(Accounts)]
+pub struct InitializeExtraAccountMetaList<'info> {
+    #[account(mut)]
+    payer: Signer<'info>,
+
+    /// CHECK: ExtraAccountMetaList Account, must use these seeds
+    #[account(
+        init,
+        seeds = [b"extra-account-metas", mint.key().as_ref()],
+        bump,
+        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", payer.key().as_ref()], bump, payer = payer, space = 16)]
+    pub counter_account: Account<'info, CounterAccount>,
+    pub token_program: Program<'info, Token2022>,
+    pub associated_token_program: Program<'info, AssociatedToken>,
+    pub system_program: Program<'info, System>,
+}
+```
+
+We also need to define this extra counter account in the TransferHook struct.
+These are the accounts that are passed to our TransferHook program every time a
+transfer is done. The client get the additional accounts from the
+ExtraAccountsMetaList PDA but here in the program we still need to define it.
+
+```rust
+#[derive(Accounts)]
+pub struct TransferHook<'info> {
+    #[account(token::mint = mint, token::authority = owner)]
+    pub source_token: InterfaceAccount<'info, TokenAccount>,
+    pub mint: InterfaceAccount<'info, 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)]
+    pub extra_account_meta_list: UncheckedAccount<'info>,
+    #[account(seeds = [b"counter", owner.key().as_ref()], bump)]
+    pub counter_account: Account<'info, CounterAccount>,
+}
+```
+
+In the client this account is auto generated and you can use it like this.
+
+```rust
+const transferInstructionWithHelper =
+await createTransferCheckedWithTransferHookInstruction(
+    connection,
+    sourceTokenAccount,
+    mint.publicKey,
+    destinationTokenAccount,
+    wallet.publicKey,
+    amountBigInt,
+    decimals,
+    [],
+    "confirmed",
+    TOKEN_2022_PROGRAM_ID
+);
+```
+
+The helper function is resolving the account automatically from the
+ExtraAccounts data account. How the account would be resolved in the client is
+like this:
+
+```js
+const [counterPDA] = PublicKey.findProgramAddressSync(
+  [Buffer.from("counter"), wallet.publicKey.toBuffer()],
+  program.programId,
+);
+```
+
+Note that the counter account is derived from the owner of the token account and
+needs to be initialized before doing a transfer. In the case of this example we
+initialize the counter account when we initialize the extra account metas. So we
+will only have a counter PDA for the owner of the token account that called that
+function. If you want to have a counter account for every token account for your
+mint out there you will need to have some functionality to create these PDAs
+before hand. There could be a button on your dapp to sign up for a counter that
+creates this PDA account and from then on the users can use this counter token.

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/tests/transfer-hook.ts

@@ -0,0 +1,192 @@
+import * as anchor from '@coral-xyz/anchor';
+import type { Program } from '@coral-xyz/anchor';
+import {
+  ASSOCIATED_TOKEN_PROGRAM_ID,
+  ExtensionType,
+  TOKEN_2022_PROGRAM_ID,
+  createAssociatedTokenAccountInstruction,
+  createInitializeMintInstruction,
+  createInitializeTransferHookInstruction,
+  createMintToInstruction,
+  createTransferCheckedWithTransferHookInstruction,
+  getAssociatedTokenAddressSync,
+  getMintLen,
+} from '@solana/spl-token';
+import { Keypair, PublicKey, SendTransactionError, SystemProgram, Transaction, sendAndConfirmTransaction } from '@solana/web3.js';
+import { BN } from 'bn.js';
+import { expect } from 'chai';
+import chai from 'chai';
+import chaiAsPromised from 'chai-as-promised';
+import type { TransferHook } from '../target/types/transfer_hook';
+
+chai.use(chaiAsPromised);
+
+describe('transfer-hook', () => {
+  // Configure the client to use the local cluster.
+  const provider = anchor.AnchorProvider.env();
+  anchor.setProvider(provider);
+
+  const program = anchor.workspace.TransferHook as Program<TransferHook>;
+  const wallet = provider.wallet as anchor.Wallet;
+  const connection = provider.connection;
+
+  // Generate keypair to use as address for the transfer-hook enabled mint
+  const mint = new Keypair();
+  const decimals = 9;
+
+  // Sender token account address
+  const sourceTokenAccount = getAssociatedTokenAddressSync(
+    mint.publicKey,
+    wallet.publicKey,
+    false,
+    TOKEN_2022_PROGRAM_ID,
+    ASSOCIATED_TOKEN_PROGRAM_ID,
+  );
+
+  // Recipient token account address
+  const recipient = Keypair.generate();
+  const destinationTokenAccount = getAssociatedTokenAddressSync(
+    mint.publicKey,
+    recipient.publicKey,
+    false,
+    TOKEN_2022_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,
+  );
+
+  const [counterPDA] = PublicKey.findProgramAddressSync([Buffer.from('counter'), wallet.publicKey.toBuffer()], program.programId);
+
+  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 transaction = new Transaction().add(
+      SystemProgram.createAccount({
+        fromPubkey: wallet.publicKey,
+        newAccountPubkey: mint.publicKey,
+        space: mintLen,
+        lamports: lamports,
+        programId: TOKEN_2022_PROGRAM_ID,
+      }),
+      createInitializeTransferHookInstruction(
+        mint.publicKey,
+        wallet.publicKey,
+        program.programId, // Transfer Hook Program ID
+        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 txDetails = await program.provider.connection.getTransaction(txSig, {
+      maxSupportedTransactionVersion: 0,
+      commitment: 'confirmed',
+    });
+    console.log(txDetails.meta.logMessages);
+
+    console.log(`Transaction Signature: ${txSig}`);
+  });
+
+  // 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 () => {
+    // 100 tokens
+    const amount = 100 * 10 ** decimals;
+
+    const transaction = new Transaction().add(
+      createAssociatedTokenAccountInstruction(
+        wallet.publicKey,
+        sourceTokenAccount,
+        wallet.publicKey,
+        mint.publicKey,
+        TOKEN_2022_PROGRAM_ID,
+        ASSOCIATED_TOKEN_PROGRAM_ID,
+      ),
+      createAssociatedTokenAccountInstruction(
+        wallet.publicKey,
+        destinationTokenAccount,
+        recipient.publicKey,
+        mint.publicKey,
+        TOKEN_2022_PROGRAM_ID,
+        ASSOCIATED_TOKEN_PROGRAM_ID,
+      ),
+      createMintToInstruction(mint.publicKey, sourceTokenAccount, wallet.publicKey, amount, [], TOKEN_2022_PROGRAM_ID),
+    );
+
+    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 () => {
+    const initializeExtraAccountMetaListInstruction = await program.methods
+      .initializeExtraAccountMetaList()
+      .accounts({
+        mint: mint.publicKey,
+      })
+      .instruction();
+
+    const transaction = new Transaction().add(initializeExtraAccountMetaListInstruction);
+
+    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 () => {
+    // 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,
+    );
+
+    console.log(`Extra accounts meta: ${extraAccountMetaListPDA}`);
+    console.log(`Counter PDA: ${counterPDA}`);
+    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);
+  });
+
+  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, program.idl.errors[1].msg);
+  });
+});

tokens/token-2022/transfer-hook/account-data-as-seed/anchor/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "types": ["mocha", "chai"],
+    "typeRoots": ["./node_modules/@types"],
+    "lib": ["es2015"],
+    "module": "commonjs",
+    "target": "es6",
+    "esModuleInterop": true
+  }
+}