Δυναμικά μεταδεδομένα NFT χρησιμοποιώντας Token Extensions

// calculate the space need for the mint account with the desired extensions
let space = ExtensionType::try_calculate_account_len::<Mint>(
    &[ExtensionType::MetadataPointer])
    .unwrap();

// This is the space required for the metadata account.
// We put the metadata into the mint account at the end so we
// don't need to create and additional account.
// Then the metadata pointer points back to the mint account.
// Using this technique, only one account is needed for both the mint
// information and the metadata.

let meta_data_space = 250;

let lamports_required = (Rent::get()?).minimum_balance(space + meta_data_space);

msg!(
    "Create Mint and metadata account size and cost: {} lamports: {}",
    space as u64,
    lamports_required
);

system_program::create_account(
    CpiContext::new(
        ctx.accounts.token_program.to_account_info(),
        system_program::CreateAccount {
            from: ctx.accounts.signer.to_account_info(),
            to: ctx.accounts.mint.to_account_info(),
        },
    ),
    lamports_required,
    space as u64,
    &ctx.accounts.token_program.key(),
)?;

// Assign the mint to the token program
system_program::assign(
    CpiContext::new(
        ctx.accounts.token_program.to_account_info(),
        system_program::Assign {
            account_to_assign: ctx.accounts.mint.to_account_info(),
        },
    ),
    &token_2022::ID,
)?;

// Initialize the metadata pointer (Need to do this before initializing the mint)
let init_meta_data_pointer_ix =
spl_token_2022::extension::metadata_pointer::instruction::initialize(
    &Token2022::id(),
    &ctx.accounts.mint.key(),
    Some(ctx.accounts.nft_authority.key()),
    Some(ctx.accounts.mint.key()),
)
.unwrap();

invoke(
    &init_meta_data_pointer_ix,
    &[
        ctx.accounts.mint.to_account_info(),
        ctx.accounts.nft_authority.to_account_info()
    ],
)?;

// Initialize the mint cpi
let mint_cpi_ix = CpiContext::new(
    ctx.accounts.token_program.to_account_info(),
    token_2022::InitializeMint2 {
        mint: ctx.accounts.mint.to_account_info(),
    },
);

token_2022::initialize_mint2(
    mint_cpi_ix,
    0,
    &ctx.accounts.nft_authority.key(),
    None).unwrap();

// We use a PDA as a mint authority for the metadata account because
// we want to be able to update the NFT from the program.
let seeds = b"nft_authority";
let bump = ctx.bumps.nft_authority;
let signer: &[&[&[u8]]] = &[&[seeds, &[bump]]];

msg!("Init metadata {0}", ctx.accounts.nft_authority.to_account_info().key);

// Init the metadata account
let init_token_meta_data_ix =
&spl_token_metadata_interface::instruction::initialize(
    &spl_token_2022::id(),
    ctx.accounts.mint.key,
    ctx.accounts.nft_authority.to_account_info().key,
    ctx.accounts.mint.key,
    ctx.accounts.nft_authority.to_account_info().key,
    "Beaver".to_string(),
    "BVA".to_string(),
    "https://arweave.net/MHK3Iopy0GgvDoM7LkkiAdg7pQqExuuWvedApCnzfj0".to_string(),
);

invoke_signed(
    init_token_meta_data_ix,
    &[ctx.accounts.mint.to_account_info().clone(), ctx.accounts.nft_authority.to_account_info().clone()],
    signer,
)?;

// Update the metadata account with an additional metadata field in this case the player level
invoke_signed(
    &spl_token_metadata_interface::instruction::update_field(
        &spl_token_2022::id(),
        ctx.accounts.mint.key,
        ctx.accounts.nft_authority.to_account_info().key,
        spl_token_metadata_interface::state::Field::Key("level".to_string()),
        "1".to_string(),
    ),
    &[
        ctx.accounts.mint.to_account_info().clone(),
        ctx.accounts.nft_authority.to_account_info().clone(),
    ],
    signer
)?;

// Create the associated token account
associated_token::create(
    CpiContext::new(
    ctx.accounts.associated_token_program.to_account_info(),
    associated_token::Create {
        payer: ctx.accounts.signer.to_account_info(),
        associated_token: ctx.accounts.token_account.to_account_info(),
        authority: ctx.accounts.signer.to_account_info(),
        mint: ctx.accounts.mint.to_account_info(),
        system_program: ctx.accounts.system_program.to_account_info(),
        token_program: ctx.accounts.token_program.to_account_info(),
    },
))?;

// Mint one token to the associated token account of the player
token_2022::mint_to(
    CpiContext::new_with_signer(
        ctx.accounts.token_program.to_account_info(),
        token_2022::MintTo {
            mint: ctx.accounts.mint.to_account_info(),
            to: ctx.accounts.token_account.to_account_info(),
            authority: ctx.accounts.nft_authority.to_account_info(),
        },
        signer
    ),
    1,
)?;

// Freeze the mint authority so no more tokens can be minted to make it an NFT
token_2022::set_authority(
    CpiContext::new_with_signer(
        ctx.accounts.token_program.to_account_info(),
        token_2022::SetAuthority {
            current_authority: ctx.accounts.nft_authority.to_account_info(),
            account_or_mint: ctx.accounts.mint.to_account_info(),
        },
        signer
    ),
    AuthorityType::MintTokens,
    None,
)?;

const nftAuthority = PublicKey.findProgramAddressSync(
  [Buffer.from("nft_authority")],
  program.programId
);

const mint = new Keypair();

const destinationTokenAccount = getAssociatedTokenAddressSync(
  mint.publicKey,
  publicKey,
  false,
  TOKEN_2022_PROGRAM_ID
);

const transaction = await program.methods
  .mintNft()
  .accounts({
    signer: publicKey,
    systemProgram: SystemProgram.programId,
    tokenProgram: TOKEN_2022_PROGRAM_ID,
    tokenAccount: destinationTokenAccount,
    mint: mint.publicKey,
    rent: web3.SYSVAR_RENT_PUBKEY,
    associatedTokenProgram: ASSOCIATED_TOKEN_PROGRAM_ID,
    nftAuthority: nftAuthority[0]
  })
  .signers([mint])
  .transaction();

console.log("transaction", transaction);

const txSig = await sendTransaction(transaction, connection, {
  signers: [mint],
  skipPreflight: true
});

console.log(`https://explorer.solana.com/tx/${txSig}?cluster=devnet`);

npx create-solana-game gameName

├── src
│   ├── instructions
│   │   ├── chop_tree.rs
│   │   ├── init_player.rs
│   │   ├── mint_nft.rs
│   │   └── update_energy.rs
│   ├── state
│   │   ├── game_data.rs
│   │   ├── mod.rs
│   │   └── player_data.rs
│   ├── lib.rs
│   └── constants.rs
│   └── errors.rs

cd program
anchor test --detach

https://explorer.solana.com/?cluster=custom&customUrl=http%3A%2F%2Flocalhost%3A8899

cd app
yarn install
yarn dev

http://localhost:8899
ws://localhost:8900

cd app
yarn install
yarn dev