Solana-dokumentaatioTokenit SolanassaLaajennukset

Siirtomaksut

Miten TransferFeeExtension toteutetaan

TransferFeeExtension mahdollistaa automaattisen maksujen keräämisen jokaisesta tokenin siirrosta. Maksut kertyvät vastaanottajan token-tilille ja ne voidaan nostaa mint account -tilille asetetun nostoviranomaisen toimesta.

Typescript

import { getCreateAccountInstruction } from "@solana-program/system";

import {

  extension,

  getInitializeAccountInstruction,

  getInitializeMintInstruction,

  getInitializeTransferFeeConfigInstruction,

  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();



// And a transfer fee config extension.

const transferFees = {

  epoch: 0n,

  maximumFee: 1_000_000n,

  transferFeeBasisPoints: 150 // 1.5%

};



const transferFeeConfigExtension = extension("TransferFeeConfig", {

  transferFeeConfigAuthority: authority.address,

  withdrawWithheldAuthority: authority.address,

  withheldAmount: 0n,

  newerTransferFee: transferFees,

  // Used for transitioning configs. Starts by being the same as newerTransferFee.

  olderTransferFee: transferFees

});



// Get mint account size with transfer fee extension

const space = BigInt(getMintSize([transferFeeConfigExtension]));



// 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 transfer fee config extension

const initializeTransferFeeConfigInstruction =

  getInitializeTransferFeeConfigInstruction({

    mint: mint.address,

    transferFeeConfigAuthority: authority.address,

    withdrawWithheldAuthority: authority.address,

    transferFeeBasisPoints: 100, // 1% fee

    maximumFee: 1_000_000n // Maximum fee of 1 token

  });



// 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

const tokenAccountLen = BigInt(getTokenSize([transferFeeConfigExtension]));



// 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,

  initializeTransferFeeConfigInstruction,

  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 Transfer Fees:", mint.address.toString());

console.log("Token Account:", tokenAccount.address.toString());

console.log("Transfer Fee: 1.5% (150 basis points)");

console.log("Maximum Fee: 1 token");

console.log("Withdraw Authority:", authority.address.toString());

console.log("Transaction Signature:", transactionSignature);
Console
Click to execute the code.

Rust

Rust
use anyhow::Result;

use solana_client::nonblocking::rpc_client::RpcClient;

use solana_commitment_config::CommitmentConfig;

use solana_sdk::{

    signature::{Keypair, Signer},

    transaction::Transaction,

};

use solana_system_interface::instruction::create_account;

use spl_associated_token_account_interface::{

    address::get_associated_token_address_with_program_id,

    instruction::create_associated_token_account,

};

use spl_token_2022_interface::{

    extension::{

        transfer_fee::{

            instruction::{

                harvest_withheld_tokens_to_mint, initialize_transfer_fee_config,

                withdraw_withheld_tokens_from_mint,

            },

            TransferFeeAmount, TransferFeeConfig,

        },

        BaseStateWithExtensions, ExtensionType, StateWithExtensions,

    },

    instruction::{initialize_mint, mint_to, transfer_checked},

    state::{Account, Mint},

    ID as TOKEN_2022_PROGRAM_ID,

};



#[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?;



    loop {

        let confirmed = client.confirm_transaction(&airdrop_signature).await?;

        if confirmed {

            break;

        }

    }



    // Generate keypair for the mint

    let mint = Keypair::new();



    // Calculate space for mint with transfer fee extension

    let mint_space =

        ExtensionType::try_calculate_account_len::<Mint>(&[ExtensionType::TransferFeeConfig])?;



    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 transfer fee config extension

    let initialize_transfer_fee_config_instruction = initialize_transfer_fee_config(

        &TOKEN_2022_PROGRAM_ID,    // program_id

        &mint.pubkey(),            // mint

        Some(&fee_payer.pubkey()), // transfer_fee_config_authority

        Some(&fee_payer.pubkey()), // withdraw_withheld_authority

        100,                       // transfer_fee_basis_points (1% = 100 basis points)

        1_000_000,                 // maximum_fee (1 token with 6 decimals)

    )?;



    // 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

        6,                         // decimals

    )?;



    // Construct transaction with all instructions

    let transaction = Transaction::new_signed_with_payer(

        &[

            create_mint_account_instruction,

            initialize_transfer_fee_config_instruction,

            initialize_mint_instruction,

        ],

        Some(&fee_payer.pubkey()),

        &[&fee_payer, &mint],

        latest_blockhash,

    );



    client.send_and_confirm_transaction(&transaction).await?;



    println!("Mint Address: {}", mint.pubkey());



    // Fetch mint account

    let mint_account = client.get_account(&mint.pubkey()).await?;

    // Deserialize the mint account with extensions

    let mint_state = StateWithExtensions::<Mint>::unpack(&mint_account.data)?;



    // Get all extension types enabled on this mint

    let extension_types = mint_state.get_extension_types()?;

    println!("\nExtensions enabled: {:?}", extension_types);



    // Deserialize the TransferFeeConfig extension data

    let transfer_fee_config = mint_state.get_extension::<TransferFeeConfig>()?;

    println!("\n{:#?}", transfer_fee_config);



    // Create two associated token accounts

    let owner1 = Keypair::new();

    let owner2 = Keypair::new();



    let ata1 = get_associated_token_address_with_program_id(

        &owner1.pubkey(),

        &mint.pubkey(),

        &TOKEN_2022_PROGRAM_ID,

    );



    let ata2 = get_associated_token_address_with_program_id(

        &owner2.pubkey(),

        &mint.pubkey(),

        &TOKEN_2022_PROGRAM_ID,

    );



    let create_ata1_instruction = create_associated_token_account(

        &fee_payer.pubkey(),

        &owner1.pubkey(),

        &mint.pubkey(),

        &TOKEN_2022_PROGRAM_ID,

    );



    let create_ata2_instruction = create_associated_token_account(

        &fee_payer.pubkey(),

        &owner2.pubkey(),

        &mint.pubkey(),

        &TOKEN_2022_PROGRAM_ID,

    );



    // Mint tokens to the first account

    let mint_amount = 10_000_000; // 10 tokens with 6 decimals

    let mint_to_instruction = mint_to(

        &TOKEN_2022_PROGRAM_ID,

        &mint.pubkey(),

        &ata1,

        &fee_payer.pubkey(),

        &[],

        mint_amount,

    )?;



    // Transfer tokens from ata1 to ata2 (will incur transfer fee)

    let transfer_amount = 5_000_000; // 5 tokens with 6 decimals

    let transfer_instruction = transfer_checked(

        &TOKEN_2022_PROGRAM_ID,

        &ata1,

        &mint.pubkey(),

        &ata2,

        &owner1.pubkey(),

        &[],

        transfer_amount,

        6,

    )?;



    let transaction = Transaction::new_signed_with_payer(

        &[

            create_ata1_instruction,

            create_ata2_instruction,

            mint_to_instruction,

            transfer_instruction,

        ],

        Some(&fee_payer.pubkey()),

        &[&fee_payer, &owner1],

        latest_blockhash,

    );



    client.send_and_confirm_transaction(&transaction).await?;



    // Fetch and deserialize the recipient token account

    let ata2_account = client.get_account(&ata2).await?;

    let ata2_state = StateWithExtensions::<Account>::unpack(&ata2_account.data)?;



    // Deserialize the TransferFeeAmount extension (withheld amount)

    let transfer_fee_amount = ata2_state.get_extension::<TransferFeeAmount>()?;

    println!("\n1. Transferred {} tokens", transfer_amount,);

    println!(

        "   Recipient Token Account withheld amount: {}",

        u64::from(transfer_fee_amount.withheld_amount)

    );



    // Harvest withheld tokens to mint

    println!("\n2. Harvesting from Token Account to Mint...");

    let harvest_instruction =

        harvest_withheld_tokens_to_mint(&TOKEN_2022_PROGRAM_ID, &mint.pubkey(), &[&ata2])?;



    let harvest_transaction = Transaction::new_signed_with_payer(

        &[harvest_instruction],

        Some(&fee_payer.pubkey()),

        &[&fee_payer],

        latest_blockhash,

    );



    client

        .send_and_confirm_transaction(&harvest_transaction)

        .await?;



    // Fetch and deserialize ATA2 again to see the withheld amount after harvest

    let ata2_account = client.get_account(&ata2).await?;

    let ata2_state = StateWithExtensions::<Account>::unpack(&ata2_account.data)?;

    let transfer_fee_amount_after = ata2_state.get_extension::<TransferFeeAmount>()?;

    println!(

        "   Token Account withheld amount after harvest: {}",

        u64::from(transfer_fee_amount_after.withheld_amount)

    );



    // Fetch and deserialize mint to see the withheld amount now stored on mint

    let mint_account = client.get_account(&mint.pubkey()).await?;

    let mint_state = StateWithExtensions::<Mint>::unpack(&mint_account.data)?;

    let mint_transfer_fee_config = mint_state.get_extension::<TransferFeeConfig>()?;

    println!(

        "   Mint withheld amount after harvest: {}",

        u64::from(mint_transfer_fee_config.withheld_amount)

    );



    // Create a destination token account for the withdraw authority to receive the fees

    let withdraw_destination_ata = get_associated_token_address_with_program_id(

        &fee_payer.pubkey(),

        &mint.pubkey(),

        &TOKEN_2022_PROGRAM_ID,

    );



    let create_withdraw_ata_instruction = create_associated_token_account(

        &fee_payer.pubkey(),

        &fee_payer.pubkey(),

        &mint.pubkey(),

        &TOKEN_2022_PROGRAM_ID,

    );



    let create_withdraw_ata_transaction = Transaction::new_signed_with_payer(

        &[create_withdraw_ata_instruction],

        Some(&fee_payer.pubkey()),

        &[&fee_payer],

        latest_blockhash,

    );



    client

        .send_and_confirm_transaction(&create_withdraw_ata_transaction)

        .await?;



    // Withdraw withheld tokens from mint to the destination token account

    println!("\n3. Withdrawing from Mint to Token Account...");

    let withdraw_instruction = withdraw_withheld_tokens_from_mint(

        &TOKEN_2022_PROGRAM_ID,

        &mint.pubkey(),

        &withdraw_destination_ata,

        &fee_payer.pubkey(), // withdraw_withheld_authority

        &[],

    )?;



    let withdraw_transaction = Transaction::new_signed_with_payer(

        &[withdraw_instruction],

        Some(&fee_payer.pubkey()),

        &[&fee_payer],

        latest_blockhash,

    );



    client

        .send_and_confirm_transaction(&withdraw_transaction)

        .await?;



    // Fetch and deserialize mint to see withheld amount after withdraw

    let mint_account = client.get_account(&mint.pubkey()).await?;

    let mint_state = StateWithExtensions::<Mint>::unpack(&mint_account.data)?;

    let mint_transfer_fee_config_after = mint_state.get_extension::<TransferFeeConfig>()?;

    println!(

        "   Mint withheld amount after withdraw: {}",

        u64::from(mint_transfer_fee_config_after.withheld_amount)

    );



    // Fetch and deserialize destination account to see received fees

    let withdraw_destination_account = client.get_account(&withdraw_destination_ata).await?;

    let withdraw_destination_state =

        StateWithExtensions::<Account>::unpack(&withdraw_destination_account.data)?;

    println!(

        "   Withdraw destination account balance: {}",

        withdraw_destination_state.base.amount

    );



    Ok(())

}
Console
Click to execute the code.

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