How to Delegate Token Accounts
You can set a delegate with an allowed amount. After you setting, the delegate is like an another owner of your token account.
import {
clusterApiUrl,
Connection,
PublicKey,
Keypair,
Transaction,
sendAndConfirmTransaction,
} from "@solana/web3.js";
import {
approveChecked,
createApproveCheckedInstruction,
} from "@solana/spl-token";
import bs58 from "bs58";
(async () => {
// connection
const connection = new Connection(clusterApiUrl("devnet"), "confirmed");
// 5YNmS1R9nNSCDzb5a7mMJ1dwK9uHeAAF4CmPEwKgVWr8
const feePayer = Keypair.fromSecretKey(
bs58.decode(
"588FU4PktJWfGfxtzpAAXywSNt74AvtroVzGfKkVN1LwRuvHwKGr851uH8czM5qm4iqLbs1kKoMKtMJG4ATR7Ld2",
),
);
// G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY
const alice = Keypair.fromSecretKey(
bs58.decode(
"4NMwxzmYj2uvHuq8xoqhY8RXg63KSVJM1DXkpbmkUY7YQWuoyQgFnnzn6yo3CMnqZasnNPNuAT2TLwQsCaKkUddp",
),
);
const randomGuy = Keypair.generate();
const mintPubkey = new PublicKey(
"8mAKLjGGmjKTnmcXeyr3pr7iX13xXVjJJiL6RujDbSPV",
);
const tokenAccountPubkey = new PublicKey(
"GMxZfDmpR1b3vdJYXHzdF5noVLQogZuUAsDHHQ3ytPfV",
);
// 1) use build-in function
{
let txhash = await approveChecked(
connection, // connection
feePayer, // fee payer
mintPubkey, // mint
tokenAccountPubkey, // token account
randomGuy.publicKey, // delegate
alice, // owner of token account
1e8, // amount, if your deciamls is 8, 10^8 for 1 token
8, // decimals
);
console.log(`txhash: ${txhash}`);
}
// or
// 2) compose by yourself
{
let tx = new Transaction().add(
createApproveCheckedInstruction(
tokenAccountPubkey, // token account
mintPubkey, // mint
randomGuy.publicKey, // delegate
alice.publicKey, // owner of token account
1e8, // amount, if your deciamls is 8, 10^8 for 1 token
8, // decimals
),
);
console.log(
`txhash: ${await sendAndConfirmTransaction(connection, tx, [
feePayer,
alice /* fee payer + owner */,
])}`,
);
}
})();