Jetons porteurs d'intérêts

import { getCreateAccountInstruction } from "@solana-program/system";
import {
  extension,
  getInitializeAccountInstruction,
  getInitializeMintInstruction,
  getInitializeInterestBearingMintInstruction,
  getMintSize,
  getTokenSize,
  TOKEN_2022_PROGRAM_ADDRESS
} from "@solana-program/token-2022";
import {
  airdropFactory,
  appendTransactionMessageInstructions,
  createSolanaRpc,
  createSolanaRpcSubscriptions,
  createTransactionMessage,
  generateKeyPairSigner,
  getSignatureFromTransaction,
  lamports,
  pipe,
  sendAndConfirmTransactionFactory,
  setTransactionMessageFeePayerSigner,
  setTransactionMessageLifetimeUsingBlockhash,
  signTransactionMessageWithSigners
} from "@solana/kit";

// Create Connection, local validator in this example
const rpc = createSolanaRpc("http://localhost:8899");
const rpcSubscriptions = createSolanaRpcSubscriptions("ws://localhost:8900");

// Generate the authority for the mint (also acts as fee payer)
const authority = await generateKeyPairSigner();

// Fund authority/fee payer
await airdropFactory({ rpc, rpcSubscriptions })({
  recipientAddress: authority.address,
  lamports: lamports(5_000_000_000n), // 5 SOL
  commitment: "confirmed"
});

// Generate keypair to use as address of mint
const mint = await generateKeyPairSigner();

// Define the interest bearing config extension
const interestRate = {
  rate: 500 // 5.00% annualized interest (in basis points)
};

// config for interest bearing extension
const interestBearingMintExtension = extension("InterestBearingConfig", {
  rateAuthority: authority.address,
  initializationTimestamp: BigInt(Math.floor(new Date().getTime() / 1000)),
  lastUpdateTimestamp: BigInt(Math.floor(new Date().getTime() / 1000)),
  preUpdateAverageRate: interestRate.rate,
  currentRate: interestRate.rate
});

// Get mint account size with interest bearing extension
const space = BigInt(getMintSize([interestBearingMintExtension]));

// Get minimum balance for rent exemption
const rent = await rpc.getMinimumBalanceForRentExemption(space).send();

// Get latest blockhash to include in transaction
const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();

// Instruction to create new account for mint (token program)
// Invokes the system program
const createMintAccountInstruction = getCreateAccountInstruction({
  payer: authority,
  newAccount: mint,
  lamports: rent,
  space,
  programAddress: TOKEN_2022_PROGRAM_ADDRESS
});

// Instruction to initialize interest bearing config extension
const initializeInterestBearingConfigInstruction =
  getInitializeInterestBearingMintInstruction({
    mint: mint.address,
    rateAuthority: authority.address,
    rate: interestRate.rate // in basis points
  });

// Instruction to initialize mint account data
// Invokes the token22 program
const initializeMintInstruction = getInitializeMintInstruction({
  mint: mint.address,
  decimals: 6,
  mintAuthority: authority.address,
  freezeAuthority: authority.address
});

// Generate keypair to use as address of token account
const tokenAccount = await generateKeyPairSigner();

// get token account size (with extension awareness)
const tokenAccountLen = BigInt(getTokenSize());

// Get minimum balance for rent exemption
const tokenAccountRent = await rpc
  .getMinimumBalanceForRentExemption(tokenAccountLen)
  .send();

// Instruction to create new account for the token account
// Invokes the system program
const createTokenAccountInstruction = getCreateAccountInstruction({
  payer: authority,
  newAccount: tokenAccount,
  lamports: tokenAccountRent,
  space: tokenAccountLen,
  programAddress: TOKEN_2022_PROGRAM_ADDRESS
});

// Instruction to initialize the created token account
const initializeTokenAccountInstruction = getInitializeAccountInstruction({
  account: tokenAccount.address,
  mint: mint.address,
  owner: authority.address
});

console.log("token account", tokenAccount.address); // ! debug

const instructions = [
  createMintAccountInstruction,
  initializeInterestBearingConfigInstruction,
  initializeMintInstruction,
  createTokenAccountInstruction,
  initializeTokenAccountInstruction
];

// Create transaction message
const transactionMessage = pipe(
  createTransactionMessage({ version: 0 }),
  (tx) => setTransactionMessageFeePayerSigner(authority, tx),
  (tx) => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
  (tx) => appendTransactionMessageInstructions(instructions, tx)
);

// Sign transaction message with all required signers
const signedTransaction =
  await signTransactionMessageWithSigners(transactionMessage);

// Send and confirm transaction
await sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions })(
  signedTransaction,
  { commitment: "confirmed", skipPreflight: true }
);

// Get transaction signature
const transactionSignature = getSignatureFromTransaction(signedTransaction);

console.log(
  "Mint Address with Interest Bearing Extension:",
  mint.address.toString()
);
console.log("Token Account:", tokenAccount.address.toString());
console.log("Interest Rate: 5% APY (500 basis points)");
console.log("Rate Authority:", authority.address.toString());
console.log("Transaction Signature:", transactionSignature);

use anyhow::Result;
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_sdk::{
  commitment_config::CommitmentConfig,
  program_pack::Pack,
  signature::{Keypair, Signer},
  system_instruction::create_account,
  transaction::Transaction,
};
use spl_token_2022::{
  ID as TOKEN_2022_PROGRAM_ID,
  extension::{
    ExtensionType,
    interest_bearing_mint::instruction::initialize as initialize_interest_bearing_instruction,
  },
  instruction::{initialize_account, initialize_mint},
  state::{Account, Mint},
};

#[tokio::main]
async fn main() -> Result<()> {
  // Create connection to local validator
  let client = RpcClient::new_with_commitment(
    String::from("http://localhost:8899"),
    CommitmentConfig::confirmed(),
  );
  let latest_blockhash = client.get_latest_blockhash().await?;

  // Generate a new keypair for the fee payer
  let fee_payer = Keypair::new();

  // Airdrop 5 SOL to fee payer
  let airdrop_signature = client
    .request_airdrop(&fee_payer.pubkey(), 5_000_000_000)
    .await?;
  client.confirm_transaction(&airdrop_signature).await?;

  // Ensure the airdrop is confirmed
  loop {
    let confirmed = client.confirm_transaction(&airdrop_signature).await?;
    if confirmed {
      break;
    }
  }

  // Generate keypair to use as address of mint
  let mint = Keypair::new();

  // Calculate mint account size with interest bearing extension
  let mint_space =
    ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::InterestBearingConfig])?;

  let mint_rent = client
    .get_minimum_balance_for_rent_exemption(mint_space)
    .await?;

  // Instruction to create new account for mint (token22)
  let create_mint_account_instruction = create_account(
    &fee_payer.pubkey(),    // payer
    &mint.pubkey(),         // new account (mint)
    mint_rent,              // lamports
    mint_space as u64,      // space
    &TOKEN_2022_PROGRAM_ID, // program id
  );

  // Instruction to initialize interest bearing extension (5% APY)
  let initialize_interest_bearing_instruction = initialize_interest_bearing_instruction(
    &TOKEN_2022_PROGRAM_ID,
    &mint.pubkey(),
    Some(fee_payer.pubkey()), // rate authority
    500,                      // interest rate (basis points) = 5%
  )?;

  // Instruction to initialize mint account data
  let initialize_mint_instruction = initialize_mint(
    &TOKEN_2022_PROGRAM_ID,    // program id
    &mint.pubkey(),            // mint
    &fee_payer.pubkey(),       // mint authority
    Some(&fee_payer.pubkey()), // freeze authority
    9,                         // decimals
  )?;

  // Generate keypair to use as address of token account
  let token_account = Keypair::new();

  // Get token account size (basic)
  let token_account_space = Account::LEN;

  let token_account_rent = client
    .get_minimum_balance_for_rent_exemption(token_account_space)
    .await?;

  // Instruction to create new account for token account (token22)
  let create_token_account_instruction = create_account(
    &fee_payer.pubkey(),        // payer
    &token_account.pubkey(),    // new account (token account)
    token_account_rent,         // rent
    token_account_space as u64, // space
    &TOKEN_2022_PROGRAM_ID,     // program id
  );

  // Instruction to initialize token account
  let initialize_token_account_instruction = initialize_account(
    &TOKEN_2022_PROGRAM_ID,  // program_id
    &token_account.pubkey(), // token account
    &mint.pubkey(),          // mint
    &fee_payer.pubkey(),     // authority
  )?;

  // Construct transaction with interest bearing mint extension
  let transaction = Transaction::new_signed_with_payer(
    &[
      create_mint_account_instruction,
      initialize_interest_bearing_instruction,
      initialize_mint_instruction,
      create_token_account_instruction,
      initialize_token_account_instruction,
    ],
    Some(&fee_payer.pubkey()),
    &[&fee_payer, &mint, &token_account],
    latest_blockhash,
  );

  // Send and confirm transaction
  let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;

  println!(
    "Mint Address with Interest Bearing Extension: {}",
    mint.pubkey()
  );
  println!("Token Account: {}", token_account.pubkey());
  println!("Interest Rate: 5% APY (500 basis points)");
  println!("Rate Authority: {}", fee_payer.pubkey());
  println!("Transaction Signature: {}", transaction_signature);

  Ok(())
}