transferFee.ts

import {
    clusterApiUrl,
    sendAndConfirmTransaction,
    Connection,
    Keypair,
    SystemProgram,
    Transaction,
    LAMPORTS_PER_SOL,
} from '@solana/web3.js';

import {
    ExtensionType,
    createInitializeMintInstruction,
    mintTo,
    createAccount,
    getMintLen,
    getTransferFeeAmount,
    unpackAccount,
    TOKEN_2022_PROGRAM_ID,
} from '../src';

import {
    createInitializeTransferFeeConfigInstruction,
    harvestWithheldTokensToMint,
    transferCheckedWithFee,
    withdrawWithheldTokensFromAccounts,
    withdrawWithheldTokensFromMint,
} from '../src/extensions/transferFee/index';

(async () => {
    const payer = Keypair.generate();

    const mintAuthority = Keypair.generate();
    const mintKeypair = Keypair.generate();
    const mint = mintKeypair.publicKey;
    const transferFeeConfigAuthority = Keypair.generate();
    const withdrawWithheldAuthority = Keypair.generate();

    const extensions = [ExtensionType.TransferFeeConfig];

    const mintLen = getMintLen(extensions);
    const decimals = 9;
    const feeBasisPoints = 50;
    const maxFee = BigInt(5_000);

    const connection = new Connection(clusterApiUrl('devnet'), 'confirmed');

    const airdropSignature = await connection.requestAirdrop(payer.publicKey, 2 * LAMPORTS_PER_SOL);
    await connection.confirmTransaction({ signature: airdropSignature, ...(await connection.getLatestBlockhash()) });

    const mintLamports = await connection.getMinimumBalanceForRentExemption(mintLen);
    const mintTransaction = new Transaction().add(
        SystemProgram.createAccount({
            fromPubkey: payer.publicKey,
            newAccountPubkey: mint,
            space: mintLen,
            lamports: mintLamports,
            programId: TOKEN_2022_PROGRAM_ID,
        }),
        createInitializeTransferFeeConfigInstruction(
            mint,
            transferFeeConfigAuthority.publicKey,
            withdrawWithheldAuthority.publicKey,
            feeBasisPoints,
            maxFee,
            TOKEN_2022_PROGRAM_ID,
        ),
        createInitializeMintInstruction(mint, decimals, mintAuthority.publicKey, null, TOKEN_2022_PROGRAM_ID),
    );
    await sendAndConfirmTransaction(connection, mintTransaction, [payer, mintKeypair], undefined);

    const mintAmount = BigInt(1_000_000_000);
    const owner = Keypair.generate();
    const sourceAccount = await createAccount(
        connection,
        payer,
        mint,
        owner.publicKey,
        undefined,
        undefined,
        TOKEN_2022_PROGRAM_ID,
    );
    await mintTo(
        connection,
        payer,
        mint,
        sourceAccount,
        mintAuthority,
        mintAmount,
        [],
        undefined,
        TOKEN_2022_PROGRAM_ID,
    );

    const accountKeypair = Keypair.generate();
    const destinationAccount = await createAccount(
        connection,
        payer,
        mint,
        owner.publicKey,
        accountKeypair,
        undefined,
        TOKEN_2022_PROGRAM_ID,
    );

    const transferAmount = BigInt(1_000_000);
    const fee = (transferAmount * BigInt(feeBasisPoints)) / BigInt(10_000);
    await transferCheckedWithFee(
        connection,
        payer,
        sourceAccount,
        mint,
        destinationAccount,
        owner,
        transferAmount,
        decimals,
        fee,
        [],
        undefined,
        TOKEN_2022_PROGRAM_ID,
    );

    const allAccounts = await connection.getProgramAccounts(TOKEN_2022_PROGRAM_ID, {
        commitment: 'confirmed',
        filters: [
            {
                memcmp: {
                    offset: 0,
                    bytes: mint.toString(),
                },
            },
        ],
    });
    const accountsToWithdrawFrom = [];
    for (const accountInfo of allAccounts) {
        const account = unpackAccount(accountInfo.pubkey, accountInfo.account, TOKEN_2022_PROGRAM_ID);
        const transferFeeAmount = getTransferFeeAmount(account);
        if (transferFeeAmount !== null && transferFeeAmount.withheldAmount > BigInt(0)) {
            accountsToWithdrawFrom.push(accountInfo.pubkey);
        }
    }

    await withdrawWithheldTokensFromAccounts(
        connection,
        payer,
        mint,
        destinationAccount,
        withdrawWithheldAuthority,
        [],
        accountsToWithdrawFrom,
        undefined,
        TOKEN_2022_PROGRAM_ID,
    );

    await harvestWithheldTokensToMint(connection, payer, mint, [destinationAccount], undefined, TOKEN_2022_PROGRAM_ID);

    await withdrawWithheldTokensFromMint(
        connection,
        payer,
        mint,
        destinationAccount,
        withdrawWithheldAuthority,
        [],
        undefined,
        TOKEN_2022_PROGRAM_ID,
    );
})();