anchor mint-close-authority example

tokens/token-2022/mint-close-authority/anchor/.gitignore

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+.anchor
+.DS_Store
+target
+**/*.rs.bk
+node_modules
+test-ledger
+.yarn

tokens/token-2022/mint-close-authority/anchor/.prettierignore

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+.anchor
+.DS_Store
+target
+node_modules
+dist
+build
+test-ledger

tokens/token-2022/mint-close-authority/anchor/Anchor.toml

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+[toolchain]
+
+[features]
+resolution = true
+skip-lint = false
+
+[programs.localnet]
+mint_close_authority = "AcfQLsYKuzprcCNH1n96pKKgAbAnZchwpbr3gbVN742n"
+
+[registry]
+url = "https://api.apr.dev"
+
+[provider]
+cluster = "Localnet"
+wallet = "~/.config/solana/id.json"
+
+[scripts]
+test = "yarn run ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"

tokens/token-2022/mint-close-authority/anchor/Cargo.toml

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+[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/mint-close-authority/anchor/migrations/deploy.ts

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+// 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 function (provider) {
+  // Configure client to use the provider.
+  anchor.setProvider(provider);
+
+  // Add your deploy script here.
+};

tokens/token-2022/mint-close-authority/anchor/package.json

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+{
+  "scripts": {
+    "lint:fix": "prettier */*.js \"*/**/*{.js,.ts}\" -w",
+    "lint": "prettier */*.js \"*/**/*{.js,.ts}\" --check"
+  },
+  "dependencies": {
+    "@coral-xyz/anchor": "^0.30.0",
+    "@solana/spl-token": "^0.4.6"
+  },
+  "devDependencies": {
+    "@types/bn.js": "^5.1.0",
+    "@types/chai": "^4.3.0",
+    "@types/mocha": "^9.0.0",
+    "chai": "^4.3.4",
+    "mocha": "^9.0.3",
+    "prettier": "^2.6.2",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^4.3.5"
+  }
+}

tokens/token-2022/mint-close-authority/anchor/programs/mint-close-authority/Cargo.toml

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+[package]
+name = "mint-close-authority"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "mint_close_authority"
+
+[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 = "0.30.0"
+anchor-spl = "0.30.0"

tokens/token-2022/mint-close-authority/anchor/programs/mint-close-authority/Xargo.toml

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+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

tokens/token-2022/mint-close-authority/anchor/programs/mint-close-authority/src/lib.rs

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+use anchor_lang::prelude::*;
+use anchor_spl::{
+    token_2022::{close_account, CloseAccount},
+    token_interface::{
+        spl_pod::optional_keys::OptionalNonZeroPubkey,
+        spl_token_2022::{
+            extension::{
+                mint_close_authority::MintCloseAuthority, BaseStateWithExtensions,
+                StateWithExtensions,
+            },
+            state::Mint as MintState,
+        },
+        Mint, Token2022,
+    },
+};
+declare_id!("AcfQLsYKuzprcCNH1n96pKKgAbAnZchwpbr3gbVN742n");
+
+#[program]
+pub mod mint_close_authority {
+    use super::*;
+
+    pub fn initialize(ctx: Context<Initialize>) -> Result<()> {
+        Initialize::check_mint_data(&ctx.accounts)?;
+        Ok(())
+    }
+
+    pub fn close(ctx: Context<Close>) -> Result<()> {
+        // cpi to token extensions programs to close mint account
+        // alternatively, this can also be done in the client
+        close_account(CpiContext::new(
+            ctx.accounts.token_program.to_account_info(),
+            CloseAccount {
+                account: ctx.accounts.mint_account.to_account_info(),
+                destination: ctx.accounts.authority.to_account_info(),
+                authority: ctx.accounts.authority.to_account_info(),
+            },
+        ))?;
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Initialize<'info> {
+    #[account(mut)]
+    pub payer: Signer<'info>,
+
+    #[account(
+        init,
+        payer = payer,
+        mint::decimals = 2,
+        mint::authority = payer,
+        extensions::close_authority::authority = payer,
+    )]
+    pub mint_account: InterfaceAccount<'info, Mint>,
+    pub token_program: Program<'info, Token2022>,
+    pub system_program: Program<'info, System>,
+}
+
+// helper to check mint data, and demonstrate how to read mint extension data within a program
+impl<'info> Initialize<'info> {
+    pub fn check_mint_data(&self) -> Result<()> {
+        let mint = &self.mint_account.to_account_info();
+        let mint_data = mint.data.borrow();
+        let mint_with_extension = StateWithExtensions::<MintState>::unpack(&mint_data)?;
+        let extension_data = mint_with_extension.get_extension::<MintCloseAuthority>()?;
+
+        assert_eq!(
+            extension_data.close_authority,
+            OptionalNonZeroPubkey::try_from(Some(self.payer.key()))?
+        );
+
+        msg!("{:?}", extension_data);
+        Ok(())
+    }
+}
+
+#[derive(Accounts)]
+pub struct Close<'info> {
+    #[account(mut)]
+    pub authority: Signer<'info>,
+
+    #[account(
+        mut,
+        extensions::close_authority::authority = authority,
+    )]
+    pub mint_account: InterfaceAccount<'info, Mint>,
+    pub token_program: Program<'info, Token2022>,
+}

tokens/token-2022/mint-close-authority/anchor/tests/mint-close-authority.ts

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+import * as anchor from "@coral-xyz/anchor";
+import { Program } from "@coral-xyz/anchor";
+import { MintCloseAuthority } from "../target/types/mint_close_authority";
+import { TOKEN_2022_PROGRAM_ID, closeAccount } from "@solana/spl-token";
+
+describe("mint-close-authority", () => {
+  // Configure the client to use the local cluster.
+  const provider = anchor.AnchorProvider.env();
+  const connection = provider.connection;
+  const wallet = provider.wallet as anchor.Wallet;
+  anchor.setProvider(provider);
+
+  const program = anchor.workspace
+    .MintCloseAuthority as Program<MintCloseAuthority>;
+
+  const mintKeypair = new anchor.web3.Keypair();
+
+  it("Create Mint with Close Authority", async () => {
+    const transactionSignature = await program.methods
+      .initialize()
+      .accounts({ mintAccount: mintKeypair.publicKey })
+      .signers([mintKeypair])
+      .rpc({ skipPreflight: true });
+    console.log("Your transaction signature", transactionSignature);
+  });
+
+  it("Close Mint with Anchor CPI", async () => {
+    const transactionSignature = await program.methods
+      .close()
+      .accounts({ mintAccount: mintKeypair.publicKey })
+      .rpc({ skipPreflight: true });
+    console.log("Your transaction signature", transactionSignature);
+  });
+
+  it("Create Mint with Close Authority again", async () => {
+    const transactionSignature = await program.methods
+      .initialize()
+      .accounts({ mintAccount: mintKeypair.publicKey })
+      .signers([mintKeypair])
+      .rpc({ skipPreflight: true });
+    console.log("Your transaction signature", transactionSignature);
+  });
+
+  it("Close Mint using @solana/spl-token", async () => {
+    const transactionSignature = await closeAccount(
+      connection,
+      wallet.payer, // Transaction fee payer
+      mintKeypair.publicKey, // Mint Account address
+      wallet.publicKey, // Account to receive lamports from closed account
+      wallet.publicKey, // Close Authority for Mint Account
+      undefined, // Additional signers
+      undefined, // Confirmation options
+      TOKEN_2022_PROGRAM_ID // Token Extension Program ID
+    );
+    console.log("Your transaction signature", transactionSignature);
+  });
+});

tokens/token-2022/mint-close-authority/anchor/tsconfig.json

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