approveTokenAndCallContract method

Future<ISendUserOperationResponse> approveTokenAndCallContract(EthereumAddress tokenAddress, EthereumAddress spender, BigInt value, Uint8List callData, [ TxOptions? options, ])

Approves a token for spending and then calls a contract.

This method first approves a certain amount of tokens for a spender and then makes a contract call. It's commonly used in scenarios like interacting with DeFi protocols where a token approval is required before making a transaction.

tokenAddress is the address of the ERC20 token to be approved. spender is the address that will be approved to spend the tokens. value is the amount of tokens to be approved for spending. callData is the encoded data for the subsequent contract call after approval. options provides additional transaction options.

Implementation

Future<ISendUserOperationResponse> approveTokenAndCallContract(
  EthereumAddress tokenAddress,
  EthereumAddress spender,
  BigInt value,
  Uint8List callData, [
  TxOptions? options,
]) async {
  final approveCallData = ContractsUtils.encodeERC20ApproveCall(
    tokenAddress,
    spender,
    value,
  );

  final calls = [
    Call(
      to: tokenAddress,
      value: BigInt.zero,
      data: approveCallData,
    ),
    Call(
      to: spender,
      value: BigInt.zero,
      data: callData,
    ),
  ];

  return executeBatch(calls, options);
}