Τεκμηρίωση SolanaTokens στο SolanaΕπεκτάσεις

Χρεώσεις Μεταφοράς

Πώς να υλοποιήσετε το TransferFeeExtension

Το TransferFeeExtension επιτρέπει την αυτόματη συλλογή χρεώσεων σε κάθε μεταφορά token. Οι χρεώσεις συσσωρεύονται στους λογαριασμούς token του παραλήπτη και μπορούν να αποσυρθούν από την αρχή απόσυρσης που έχει οριστεί στον mint account.

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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