Documentation SolanaTokens sur SolanaPrincipes de base

Approuver un délégué

Comment approuver un délégué

L'instruction ApproveChecked accorde à un autre compte (le délégué) la permission de transférer un montant spécifique de tokens depuis votre token account. Le délégué peut transférer des tokens jusqu'à concurrence du montant approuvé, mais ne peut pas le dépasser. Seul le propriétaire du token account peut approuver un délégué, et chaque token account ne peut avoir qu'un seul délégué à la fois. Toute nouvelle approbation remplace la précédente.

Le Token Program et le Token Extension Program partagent des implémentations similaires pour atteindre la même fonctionnalité.

Typescript

import {

  airdropFactory,

  appendTransactionMessageInstructions,

  createSolanaRpc,

  createSolanaRpcSubscriptions,

  createTransactionMessage,

  generateKeyPairSigner,

  getSignatureFromTransaction,

  lamports,

  pipe,

  sendAndConfirmTransactionFactory,

  setTransactionMessageFeePayerSigner,

  setTransactionMessageLifetimeUsingBlockhash,

  signTransactionMessageWithSigners

} from "@solana/kit";

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

import {

  getCreateAssociatedTokenInstructionAsync,

  getInitializeMintInstruction,

  getMintSize,

  TOKEN_PROGRAM_ADDRESS,

  findAssociatedTokenPda,

  getMintToInstruction,

  getApproveCheckedInstruction

} from "@solana-program/token";



// Create Connection, local validator in this example

const rpc = createSolanaRpc("http://localhost:8899");

const rpcSubscriptions = createSolanaRpcSubscriptions("ws://localhost:8900");



// Generate keypairs for fee payer and delegate

const feePayer = await generateKeyPairSigner();

const delegate = await generateKeyPairSigner();



// Fund fee payer

await airdropFactory({ rpc, rpcSubscriptions })({

  recipientAddress: feePayer.address,

  lamports: lamports(1_000_000_000n),

  commitment: "confirmed"

});



// Generate keypair to use as address of mint

const mint = await generateKeyPairSigner();



// Get default mint account size (in bytes), no extensions enabled

const space = BigInt(getMintSize());



// 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 createAccountInstruction = getCreateAccountInstruction({

  payer: feePayer,

  newAccount: mint,

  lamports: rent,

  space,

  programAddress: TOKEN_PROGRAM_ADDRESS

});



// Instruction to initialize mint account data

// Invokes the token program

const initializeMintInstruction = getInitializeMintInstruction({

  mint: mint.address,

  decimals: 9,

  mintAuthority: feePayer.address

});



// Use findAssociatedTokenPda to derive the ATA address

const [associatedTokenAddress] = await findAssociatedTokenPda({

  mint: mint.address,

  owner: feePayer.address,

  tokenProgram: TOKEN_PROGRAM_ADDRESS

});



// Create instruction to create the associated token account

const createAtaInstruction = await getCreateAssociatedTokenInstructionAsync({

  payer: feePayer,

  mint: mint.address,

  owner: feePayer.address

});



// Create instruction to mint tokens

const mintToInstruction = getMintToInstruction({

  mint: mint.address,

  token: associatedTokenAddress,

  mintAuthority: feePayer.address,

  amount: 1000_000_000_000n // 1000.0 tokens with 9 decimals

});



const instructions = [

  createAccountInstruction,

  initializeMintInstruction,

  createAtaInstruction,

  mintToInstruction

];



// Create transaction message

const transactionMessage = pipe(

  createTransactionMessage({ version: 0 }),

  (tx) => setTransactionMessageFeePayerSigner(feePayer, 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" }

);



// Get transaction signature

const transactionSignature = getSignatureFromTransaction(signedTransaction);



console.log("Mint Address:", mint.address.toString());

console.log(

  "Associated Token Account Address:",

  associatedTokenAddress.toString()

);

console.log("Transaction Signature:", transactionSignature);



// Get a fresh blockhash for the approve transaction

const { value: approveBlockhash } = await rpc.getLatestBlockhash().send();



// Create instruction to approve delegate

const approveInstruction = getApproveCheckedInstruction({

  source: associatedTokenAddress,

  mint: mint.address,

  delegate: delegate.address,

  owner: feePayer,

  amount: 1_000_000_000n, // 1.0 tokens with 9 decimals

  decimals: 9

});



// Create transaction message for approval

const approveTxMessage = pipe(

  createTransactionMessage({ version: 0 }),

  (tx) => setTransactionMessageFeePayerSigner(feePayer, tx),

  (tx) => setTransactionMessageLifetimeUsingBlockhash(approveBlockhash, tx),

  (tx) => appendTransactionMessageInstructions([approveInstruction], tx)

);



// Sign transaction message with all required signers

const signedApproveTx =

  await signTransactionMessageWithSigners(approveTxMessage);



// Send and confirm transaction

await sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions })(

  signedApproveTx,

  { commitment: "confirmed" }

);



// Get transaction signature

const transactionSignature2 = getSignatureFromTransaction(signedApproveTx);



console.log("\nDelegate Address:", delegate.address.toString());

console.log("Successfully approved delegate to transfer 1.0 tokens");

console.log("Transaction Signature:", transactionSignature2);
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::{

    program_pack::Pack,

    signature::{Keypair, Signer},

    transaction::Transaction,

};

use solana_system_interface::instruction::create_account;

use spl_associated_token_account_interface::{

    address::get_associated_token_address, instruction::create_associated_token_account,

};

use spl_token_interface::{

    id as token_program_id,

    instruction::{approve_checked, initialize_mint, mint_to},

    state::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();



    // Generate a keypair for the delegate

    let delegate = Keypair::new();



    // Airdrop 1 SOL to fee payer

    let airdrop_signature = client

        .request_airdrop(&fee_payer.pubkey(), 1_000_000_000)

        .await?;

    client.confirm_transaction(&airdrop_signature).await?;



    loop {

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

        if confirmed {

            break;

        }

    }



    // Generate keypair to use as address of mint

    let mint = Keypair::new();



    // Number of decimals for the mint

    let decimals = 2;



    // Get default mint account size (in bytes), no extensions enabled

    let mint_space = Mint::LEN;

    let mint_rent = client

        .get_minimum_balance_for_rent_exemption(mint_space)

        .await?;



    // Instruction to create new account for mint (token program)

    let create_account_instruction = create_account(

        &fee_payer.pubkey(), // payer

        &mint.pubkey(),      // new account (mint)

        mint_rent,           // lamports

        mint_space as u64,   // space

        &token_program_id(), // program id

    );



    // Instruction to initialize mint account data

    let initialize_mint_instruction = initialize_mint(

        &token_program_id(),

        &mint.pubkey(),            // mint

        &fee_payer.pubkey(),       // mint authority

        Some(&fee_payer.pubkey()), // freeze authority

        decimals,                  // decimals

    )?;



    // Calculate the associated token account address for fee_payer

    let associated_token_address = get_associated_token_address(

        &fee_payer.pubkey(), // owner

        &mint.pubkey(),      // mint

    );



    // Instruction to create associated token account

    let create_ata_instruction = create_associated_token_account(

        &fee_payer.pubkey(), // funding address

        &fee_payer.pubkey(), // wallet address

        &mint.pubkey(),      // mint address

        &token_program_id(), // program id

    );



    // Amount of tokens to mint (100 tokens with 2 decimals)

    let amount = 100_00;



    // Create mint_to instruction to mint tokens to the associated token account

    let mint_to_instruction = mint_to(

        &token_program_id(),

        &mint.pubkey(),            // mint

        &associated_token_address, // destination

        &fee_payer.pubkey(),       // authority

        &[&fee_payer.pubkey()],    // signer

        amount,                    // amount

    )?;



    // Create transaction and add instructions

    let transaction = Transaction::new_signed_with_payer(

        &[

            create_account_instruction,

            initialize_mint_instruction,

            create_ata_instruction,

            mint_to_instruction,

        ],

        Some(&fee_payer.pubkey()),

        &[&fee_payer, &mint],

        latest_blockhash,

    );



    // Send and confirm transaction

    client.send_and_confirm_transaction(&transaction).await?;



    // Amount of tokens to approve (1 token with 2 decimals)

    let approve_amount = 1_00;



    // Create approve_checked instruction

    let approve_instruction = approve_checked(

        &token_program_id(),       // program id

        &associated_token_address, // source token account

        &mint.pubkey(),            // mint

        &delegate.pubkey(),        // delegate

        &fee_payer.pubkey(),       // owner

        &[&fee_payer.pubkey()],    // signers

        approve_amount,            // amount

        decimals,                  // decimals

    )?;



    // Create transaction for approving delegate

    let transaction = Transaction::new_signed_with_payer(

        &[approve_instruction],

        Some(&fee_payer.pubkey()),

        &[&fee_payer],

        latest_blockhash,

    );



    // Send and confirm transaction

    let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;



    let token = client.get_token_account(&associated_token_address).await?;



    println!("Successfully approved delegate for 1.0 token");



    println!("\nDelegate Address: {}", delegate.pubkey());



    println!("\nToken Account Address: {}", associated_token_address);

    if let Some(token) = token {

        println!("{:#?}", token);

    }

    println!("Transaction Signature: {}", transaction_signature);



    Ok(())

}
Console
Click to execute the code.

Python

Python
#!/usr/bin/env python3



import asyncio

from solana.rpc.async_api import AsyncClient

from solders.keypair import Keypair

from solders.transaction import VersionedTransaction

from solders.message import MessageV0

from solders.system_program import create_account, CreateAccountParams

from spl.token.instructions import (

    initialize_mint, InitializeMintParams,

    create_associated_token_account,

    mint_to_checked, MintToCheckedParams,

    approve_checked, ApproveCheckedParams,

    get_associated_token_address

)

from spl.token.constants import TOKEN_PROGRAM_ID, ASSOCIATED_TOKEN_PROGRAM_ID



# Constants

DECIMALS = 9



async def setup(rpc, mint_authority):

    """

    The setup function initializes the mint and associated token accounts,

    and mints tokens to said associated token account

    """

    mint = Keypair()



    space = 82  # getMintSize() equivalent for SPL Token



    # Get minimum balance for rent exemption

    rent = await rpc.get_minimum_balance_for_rent_exemption(space)



    # Create & initialize mint account

    create_account_instruction = create_account(

        CreateAccountParams(

            from_pubkey=mint_authority.pubkey(),

            to_pubkey=mint.pubkey(),

            lamports=rent.value,

            space=space,

            owner=TOKEN_PROGRAM_ID

        )

    )



    initialize_mint_instruction = initialize_mint(

        InitializeMintParams(

            program_id=TOKEN_PROGRAM_ID,

            mint=mint.pubkey(),

            decimals=DECIMALS,

            mint_authority=mint_authority.pubkey(),

            freeze_authority=None

        )

    )



    # Create associated token account

    authority_ata = get_associated_token_address(

        owner=mint_authority.pubkey(),

        mint=mint.pubkey(),

        token_program_id=TOKEN_PROGRAM_ID

    )



    create_authority_ata_instruction = create_associated_token_account(

        payer=mint_authority.pubkey(),

        owner=mint_authority.pubkey(),

        mint=mint.pubkey()

    )



    # Mint to token account

    mint_to_instruction = mint_to_checked(

        MintToCheckedParams(

            program_id=TOKEN_PROGRAM_ID,

            mint=mint.pubkey(),

            dest=authority_ata,

            mint_authority=mint_authority.pubkey(),

            amount=1_000_000_000_000,  # 1000 tokens

            decimals=DECIMALS

        )

    )



    instructions = [

        create_account_instruction,

        initialize_mint_instruction,

        create_authority_ata_instruction,

        mint_to_instruction

    ]



    # Get latest blockhash

    latest_blockhash = await rpc.get_latest_blockhash()



    # Create message

    transaction_message = MessageV0.try_compile(

        payer=mint_authority.pubkey(),

        instructions=instructions,

        address_lookup_table_accounts=[],

        recent_blockhash=latest_blockhash.value.blockhash

    )



    # Create and sign transaction

    signed_transaction = VersionedTransaction(transaction_message, [mint_authority, mint])



    print("Setup transaction created successfully")

    print(f"Mint: {mint.pubkey()}")

    print(f"Authority ATA: {authority_ata}")



    return {

        "mint": mint.pubkey(),

        "authority_ata": authority_ata

    }



async def main():

    rpc = AsyncClient("http://localhost:8899")



    # Constants

    mint_authority = Keypair()

    delegate = Keypair()



    async with rpc:

        # Get latest blockhash

        latest_blockhash = await rpc.get_latest_blockhash()



        # Setup mint and associated token accounts

        setup_result = await setup(rpc, mint_authority)

        mint = setup_result["mint"]

        authority_ata = setup_result["authority_ata"]



        # Create delegate instruction

        delegate_instruction = approve_checked(

            ApproveCheckedParams(

                program_id=TOKEN_PROGRAM_ID,

                source=authority_ata,

                mint=mint,

                delegate=delegate.pubkey(),

                owner=mint_authority.pubkey(),

                amount=1_000_000_000,  # 1 token

                decimals=DECIMALS

            )

        )



        # Create transaction message

        transaction_message = MessageV0.try_compile(

            payer=mint_authority.pubkey(),

            instructions=[delegate_instruction],

            address_lookup_table_accounts=[],

            recent_blockhash=latest_blockhash.value.blockhash

        )



        # Create and sign transaction

        signed_transaction = VersionedTransaction(transaction_message, [mint_authority])



        print(f"\nDelegate Transaction:")

        print(f"Source: {authority_ata}")

        print(f"Mint: {mint}")

        print(f"Delegate: {delegate.pubkey()}")

        print(f"Owner: {mint_authority.pubkey()}")

        print(f"Amount: 1_000_000_000 (1 token)")

        print(f"Decimals: {DECIMALS}")

        print(f"Delegation transaction created successfully")



if __name__ == "__main__":

    asyncio.run(main())
Console
Click to execute the code.

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