Help doing opt-in of ASA to smart contract

General
,
1

Greetings Algofam!

I want to opt-in my smart contract into an ASA through an inner transaction. Here is my code:

    @Subroutine(TealType.none)
    def opt_in_smart_contract_to_asa(asa_id):
     
        return Seq([
        
        InnerTxnBuilder.Begin(),

            InnerTxnBuilder.SetFields({
                TxnField.type_enum : TxnType.AssetTransfer,
                TxnField.xfer_asset : asa_id,
                TxnField.asset_amount : Int(0),
                TxnField.asset_sender : Global.current_application_address(),
                TxnField.asset_receiver: Global.current_application_address(),
                TxnField.fee : Int(6_000)
                }),

        InnerTxnBuilder.Submit()
            
        ])


    @Subroutine(TealType.none)
    def opt_in_transaction():

        asa_id = Btoi( Txn.application_args[1] )
        smart_contract_asset_balance = AssetHolding.balance( Global.current_application_address(), asa_id ) 
        

        # if smart contract is not opted in to the asset, 
        # call smart_contract_opt_in_to_asa()
        return Seq([
            smart_contract_asset_balance,

            # below if statement returns 1 if the smart contract is not opted in to asset
            If( Not(smart_contract_asset_balance.hasValue()) ).
                # if smart contract is not opted in to the asset, 
                # send an opt in transaction for the asset
                Then( Seq( opt_in_smart_contract_to_asa(asa_id) ) )
                # transfer the asset to the smart contract with a rekey back to the sender
                #Then( Seq( asset_transfer(asa_id, amount)) )
            ])

I keep getting the following error:

TransactionPool.Remember: transaction F5PPWKTO3IJKGQMQPN2QBRHOHPDF7LUGPHRD6XJGKSZQARDQS7RQ: logic eval error: clawback not allowed: sender CCVIIUUVP74CYJJWNPKBP4DIVFQKBS37R2U3VNOHEZUMTGE5VOEZD4IN24, clawback AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAY5HFKQ. Details: pc=144, opcodes=pushint 6000
itxn_field Fee
itxn_submit

Any ideas as to what may be causing it?

2

Changing AssetSender to Sender did the trick. What is the difference between AssetReceiver and Receiver? The documentation does not say too much about it.

3

See Why have both txn.sender() and txn.asset_sender() in PyTEAL? - #2 by jannotti

In short:

1 Like
4

In other words

  • In AssetTransfer, use: Sender, AssetReceiver
  • In Payment, use: Sender , Receiver

Right?

5

Yes, unless you want clawback for AssetTransfer, which is not usual.