Sol.College

Token-2022 (Token Extensions)

Token-2022 is a separate token program with the same core layout as the original Token Program, plus optional extensions configured when the mint is created: transfer fees, metadata pointers, transfer hooks, non-transferable tokens and more. Code has to pass the right token program ID. Anchor's token_interface lets one instruction accept either program.

Reference: Solana docs: Token Extensions · Solana Program Library: Token-2022

Real code, line by line

3 excerpts from different projects. Each caption links the exact lines at the fork's pinned commit. The notes below each excerpt explain the lines that matter.

restacked-dev/valhalla · lib/src/lib/getMintWithCorrectTokenProgram.ts L1–26 @ 7aa9ddf · MIT · original
import { PublicKey, type Connection } from "@solana/web3.js";import {  Mint,  TOKEN_2022_PROGRAM_ID,  TOKEN_PROGRAM_ID,  getMint,} from "@solana/spl-token";import { Vault } from "./program";import { ValhallaVault } from "./models"; export async function getMintWithCorrectTokenProgram(  connection: Connection,  vault: Partial<Vault | ValhallaVault>): Promise<{ mint: Mint; tokenProgramId: PublicKey }> {  try {    const mint = new PublicKey(vault.mint || "");    return {      mint: await getMint(connection, mint),      tokenProgramId: TOKEN_PROGRAM_ID,    };  } catch (error) {    const mint = new PublicKey(vault.mint || "");    return {      mint: await getMint(connection, mint, undefined, TOKEN_2022_PROGRAM_ID),      tokenProgramId: TOKEN_2022_PROGRAM_ID,    };
  1. Line 4 TOKEN_2022_PROGRAM_ID,: Targets the Token-2022 program instead of the original Token Program.
pubkeyapp/tokengator · libs/api/preset/data-access/src/lib/api-preset-minter.service.ts L203–228 @ b87eed9 · MIT · original
    const minterTokenAccount = getAssociatedTokenAddressSync(      mintKeypair.publicKey,      minter,      true,      TOKEN_2022_PROGRAM_ID,      ASSOCIATED_TOKEN_PROGRAM_ID,    )     // TODO: Change funder as per needed    const funder = authority    const funderPaymentTokenAccount = getAssociatedTokenAddressSync(      paymentConfig.mint,      funder.publicKey,      false,      TOKEN_2022_PROGRAM_ID,      ASSOCIATED_TOKEN_PROGRAM_ID,    )     const { decimals: paymentConfigDecimals } = await getMint(      this.solana.connection,      paymentConfig.mint,      'confirmed',      TOKEN_2022_PROGRAM_ID,    )     const { decimals: appPaymentConfigDecimals } = await getMint(
  1. Line 207 TOKEN_2022_PROGRAM_ID,: Targets the Token-2022 program instead of the original Token Program.
cosmic-lab-inc/epoch · warden/src/warden.rs L2–27 @ 09c8df3 · Apache-2.0 · original
 use std::str::FromStr; use anchor_spl::associated_token;use common_utils::prelude::anchor_spl::token_2022::spl_token_2022;use common_utils::prelude::anchor_spl::token_2022::spl_token_2022::extension::transfer_fee::TransferFeeAmount;use common_utils::prelude::anchor_spl::token_2022::spl_token_2022::extension::{    BaseStateWithExtensions, StateWithExtensions,};use common_utils::prelude::*;use log::{error, info, warn};use nacl::sign::generate_keypair;use player_profile::client::find_key_in_profile;use player_profile::state::{Profile, ProfileKey};use profile_vault::{drain_vault_ix, ProfileVaultPermissions, VaultAuthority};use solana_sdk::bs58;use solana_sdk::commitment_config::CommitmentConfig;use solana_sdk::pubkey::Pubkey; use common::VaultBalance; use crate::{    redis::redis_client::RedisClient, scrambler::Scrambler, HasherTrait, ToRedisKey, WardenError,}; pub const EPOCH_MINT: &str = "EPCHJ3JhGrx2y9NKR5BsmCLwBpFxFheMHDZsmn59BwAi";
  1. Line 6 use common_utils::prelude::anchor_spl::token_2022::spl_token_2022;: Targets the Token-2022 program instead of the original Token Program.

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