Aprobar Delegado

¿Qué Hace Aprobar un Delegado?

Aprobar un delegado permite que otra dirección transfiera o queme una cantidad limitada de tokens desde una token account en nombre del propietario de la cuenta de tokens.

Una token account almacena un delegado actual y una cantidad delegada a la vez. Aprobar un nuevo delegado reemplaza el delegado anterior y la cantidad autorizada en la cuenta.

Cómo Aprobar un Delegado

Aprobar un delegado utiliza la instrucción Approve o ApproveChecked del Token Program.

Los ejemplos a continuación usan ApproveChecked, que requiere que el llamador proporcione el mint y los decimales para que la instrucción pueda verificar el mint esperado y la precisión del token antes de procesar la aprobación.

El propietario de la token account firma la aprobación.

Referencia del Código Fuente

ElementoDescripciónToken ProgramToken Extensions Program
AccountEl estado de la token account almacena el propietario, delegado y cantidad delegada.FuenteFuente
ApproveUna instrucción de aprobación de delegado que registra el delegado y la cantidad autorizada para una token account sin requerir que el llamador proporcione el mint o los decimales.FuenteFuente
ApproveCheckedUna instrucción de aprobación de delegado que requiere que el llamador proporcione el mint y los decimales y verifica esos valores antes de registrar el delegado y la cantidad autorizada.FuenteFuente
process_approveLógica compartida del procesador para la aprobación de delegado.FuenteFuente

Typescript

Los ejemplos de Kit a continuación muestran el enfoque recomendado usando @solana/kit. Los ejemplos heredados que usan @solana/web3.js se incluyen como referencia.

Kit

import { generateKeyPairSigner } from "@solana/kit";
import { createLocalClient } from "@solana/kit-client-rpc";
import {
findAssociatedTokenPda,
tokenProgram,
TOKEN_PROGRAM_ADDRESS
} from "@solana-program/token";
const client = await createLocalClient()
.use(tokenProgram());
const mint = await generateKeyPairSigner();
const delegate = await generateKeyPairSigner();
const [tokenAccount] = await findAssociatedTokenPda({
mint: mint.address,
owner: client.payer.address,
tokenProgram: TOKEN_PROGRAM_ADDRESS
});
const result = await client.token.instructions
.approveChecked({
source: tokenAccount, // Token account whose delegate approval changes.
mint: mint.address, // Mint for the token the delegate may spend.
delegate: delegate.address, // Delegate allowed to spend from the token account.
owner: client.payer, // Owner approving this delegate change.
amount: 25n, // Token amount in base units.
decimals: 2 // Decimals defined on the mint account.
})
.sendTransaction();
const tokenAccountData = await client.token.accounts.token.fetch(tokenAccount);
console.log("Mint Address:", mint.address);
console.log("\nToken Account Address:", tokenAccount);
console.log("Token Account:", tokenAccountData.data);
console.log("\nDelegate Address:", delegate.address);
console.log("\nTransaction Signature:", result.context.signature);
Console
Click to execute the code.

Web3.js

import { Connection, Keypair, LAMPORTS_PER_SOL } from "@solana/web3.js";
import {
createAssociatedTokenAccount,
approveChecked,
createMint,
getAccount,
mintToChecked,
TOKEN_PROGRAM_ID
} from "@solana/spl-token";
const result = await approveChecked(
connection, // Connection to the local validator.
feePayer, // Account paying transaction fees.
mintPubkey, // Mint for the token the delegate may spend.
associatedTokenAccount, // Token account whose delegate approval changes.
delegate.publicKey, // Delegate allowed to spend from the token account.
feePayer, // Owner approving this delegate change.
25, // Token amount in base units.
2, // Decimals defined on the mint account.
[], // Additional multisig signers.
{
commitment: "confirmed" // Confirmation options for the transaction.
},
TOKEN_PROGRAM_ID // Token program to invoke.
);
const tokenAccountData = await getAccount(
connection,
associatedTokenAccount,
"confirmed",
TOKEN_PROGRAM_ID
);
console.log("Mint Address:", mintPubkey.toBase58());
console.log(
"\nAssociated Token Account Address:",
associatedTokenAccount.toBase58()
);
console.log("Associated Token Account:", tokenAccountData);
console.log("\nDelegate Address:", delegate.publicKey.toBase58());
console.log("\nTransaction Signature:", result);
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_checked},
state::{Account, Mint},
};
#[tokio::main]
async fn main() -> Result<()> {
let client = RpcClient::new_with_commitment(
String::from("http://localhost:8899"),
CommitmentConfig::confirmed(),
);
let delegate = Keypair::new();
let approve_amount = 25;
let transaction = Transaction::new_signed_with_payer(
&[
approve_checked(
&token_program_id(), // Token program to invoke.
&associated_token_address, // Token account whose delegate approval changes.
&mint.pubkey(), // Mint for the token the delegate may spend.
&delegate.pubkey(), // Delegate allowed to spend from the token account.
&fee_payer.pubkey(), // Owner approving this delegate change.
&[], // Additional multisig signers.
approve_amount, // Token amount in base units.
decimals, // Decimals defined on the mint account.
)?,
],
Some(&fee_payer.pubkey()),
&[&fee_payer],
latest_blockhash,
);
let transaction_signature = client.send_and_confirm_transaction(&transaction).await?;
let token_account = client.get_account(&associated_token_address).await?;
let token_data = Account::unpack(&token_account.data)?;
println!("Mint Address: {}", mint.pubkey());
println!(
"\nAssociated Token Account Address: {}",
associated_token_address
);
println!("Associated Token Account: {:#?}", token_data);
println!("\nDelegate Address: {}", delegate.pubkey());
println!("\nTransaction Signature: {}", transaction_signature);
Ok(())
}
Console
Click to execute the code.

Python

Python
#!/usr/bin/env python3
import asyncio
import json
from solana.rpc.async_api import AsyncClient
from solders.keypair import Keypair
from solders.message import Message
from solders.pubkey import Pubkey
from solders.system_program import create_account, CreateAccountParams
from solders.transaction import Transaction
from spl.token.async_client import AsyncToken
from spl.token.instructions import (
approve_checked,
ApproveCheckedParams,
create_associated_token_account,
get_associated_token_address,
initialize_mint,
InitializeMintParams,
mint_to_checked,
MintToCheckedParams,
)
from spl.token.constants import MINT_LEN, TOKEN_PROGRAM_ID
DECIMALS = 2
AMOUNT_TO_MINT = 100
AMOUNT_TO_APPROVE = 25
async def main():
rpc = AsyncClient("http://localhost:8899")
delegate = Keypair()
async with rpc:
approve_delegate_instruction = approve_checked(
ApproveCheckedParams(
program_id=TOKEN_PROGRAM_ID, # Token program to invoke.
source=token_account_address, # Token account whose delegate approval changes.
mint=mint.pubkey(), # Mint for the token the delegate may spend.
delegate=delegate.pubkey(), # Account allowed to spend from the token account.
owner=fee_payer.pubkey(), # Account that owns the token account.
amount=AMOUNT_TO_APPROVE, # Token amount in base units.
decimals=DECIMALS, # Decimals defined on the mint account.
)
)
latest_blockhash = await rpc.get_latest_blockhash()
transaction = Transaction(
[fee_payer],
Message([approve_delegate_instruction], fee_payer.pubkey()),
latest_blockhash.value.blockhash,
)
result = await rpc.send_transaction(transaction)
token_account_info = await token.get_account_info(token_account_address)
token_account = {
key: str(value) if isinstance(value, Pubkey) else value
for key, value in token_account_info._asdict().items()
}
print("Mint Address:", mint.pubkey())
print("\nToken Account Address:", token_account_address)
print("Token Account:")
print(json.dumps(token_account, indent=2))
print("\nDelegate Address:", delegate.pubkey())
print("\nTransaction Signature:", result.value)
if __name__ == "__main__":
asyncio.run(main())
Console
Click to execute the code.

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