Menyetujui Delegasi

Apa Fungsi Menyetujui Delegasi?

Menyetujui delegasi memungkinkan alamat lain untuk mentransfer atau membakar sejumlah token terbatas dari sebuah token account atas nama pemilik token account tersebut.

Sebuah token account menyimpan satu delegasi aktif dan satu jumlah yang didelegasikan pada satu waktu. Menyetujui delegasi baru akan menggantikan delegasi sebelumnya dan batas alokasi pada akun tersebut.

Cara Menyetujui Delegasi

Menyetujui delegasi menggunakan instruksi Approve atau ApproveChecked dari Token Program.

Contoh di bawah ini menggunakan ApproveChecked, yang memerlukan pemanggil untuk menyediakan mint dan desimal sehingga instruksi dapat memverifikasi mint yang diharapkan dan presisi token sebelum memproses persetujuan.

Pemilik token account menandatangani persetujuan tersebut.

Referensi Sumber

ItemDeskripsiToken ProgramToken Extensions Program
AccountState token account menyimpan pemilik, delegasi, dan jumlah yang didelegasikan.SumberSumber
ApproveInstruksi persetujuan delegasi yang mencatat delegasi dan batas alokasi untuk sebuah token account tanpa mengharuskan pemanggil menyediakan mint atau desimal.SumberSumber
ApproveCheckedInstruksi persetujuan delegasi yang mengharuskan pemanggil menyediakan mint dan desimal serta memeriksa nilai-nilai tersebut sebelum mencatat delegasi dan batas alokasi.SumberSumber
process_approveLogika prosesor bersama untuk persetujuan delegasi.SumberSumber

Typescript

Contoh Kit di bawah ini menunjukkan pendekatan yang direkomendasikan menggunakan @solana/kit. Contoh lama menggunakan @solana/web3.js disertakan sebagai referensi.

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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