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

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_associated_token_account::{
get_associated_token_address_with_program_id, instruction::create_associated_token_account,
};
use spl_token::{
id as token_program_id,
instruction::{initialize_mint, mint_to, approve_checked},
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 latestBlockhash = 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();
// 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
9, // decimals
)?;
// Calculate the associated token account address for fee_payer
let associated_token_address = get_associated_token_address_with_program_id(
&fee_payer.pubkey(), // owner
&mint.pubkey(), // mint
&token_program_id(), // program_id
);
// 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 (1000 tokens with 9 decimals)
let amount = 1000_000_000_000;
// 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],
latestBlockhash,
);
// Send and confirm transaction
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
println!("Mint Address: {}", mint.pubkey());
println!(
"Associated Token Account Address: {}",
associated_token_address
);
println!("\nTransaction Signature: {}", transaction_signature);
// Get the latest blockhash for the approve transaction
let latestBlockhash = client.get_latest_blockhash().await?;
// Amount of tokens to approve (1 token with 9 decimals)
let approve_amount = 1_000_000_000;
// 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
9, // decimals
)?;
// Create transaction for approving delegate
let transaction = Transaction::new_signed_with_payer(
&[approve_instruction],
Some(&fee_payer.pubkey()),
&[&fee_payer],
latestBlockhash,
);
// Send and confirm transaction
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
println!("\nDelegate Address: {}", delegate.pubkey());
println!(
"Successfully approved delegate to transfer 1.0 tokens"
);
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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