approve static method

TransactionInstruction approve({ required Pubkey source, required Pubkey delegate, required Pubkey owner, List<Pubkey> signers = const [], required bu64 amount, })

Approves a delegate. A delegate is given the authority over tokens on behalf of the source account's owner.

Keys:

Single owner

• [w] source - The source account.
• [] delegate - The delegate.
• [s] owner - The source account owner.

Multisignature owner

• [w] source - The source account.
• [] delegate - The delegate.
• [] owner - The source account's multisignature owner.
• [s] signers - The signer accounts.

Data:

• amount - The amount of tokens the delegate is approved for.

Implementation

static TransactionInstruction approve({
  // Keys
  required final Pubkey source,
  required final Pubkey delegate,
  required final Pubkey owner,
  final List<Pubkey> signers = const [],
  // Data
  required final bu64 amount,
}) {
  // * Single owner
  // 0. `[w]` The source account.
  // 1. `[]` The delegate.
  // 2. `[s]` The source account owner.
  //
  // * Multisignature owner
  // 0. `[w]` The source account.
  // 1. `[]` The delegate.
  // 2. `[]` The source account's multisignature owner.
  // 3. ..3+M `[s]` M signer accounts
  final List<AccountMeta> keys = [
    AccountMeta.writable(source),
    AccountMeta(delegate),
    AccountMeta(owner, isSigner: signers.isEmpty),
    for (final Pubkey signer in signers) AccountMeta.signer(signer),
  ];

  final List<Iterable<int>> data = [
    borsh.u64.encode(amount),
  ];

  return _instance.createTransactionIntruction(
    TokenInstruction.approve,
    keys: keys,
    data: data,
  );
}