Return a ShutdownScript when using ShutdownScript.new_witness_program (Kotlin/Java)

[ConorOkus]

I'm trying to override LDK's get_shutdown_scriptpubkey on the SignerProvider in Kotlin. Some work has been done on the BDK side to extract the payload from an address in order to extract and reuse the WitnessProgram here.

interface LDKSignerProvider : SignerProvider.SignerProviderInterface {
    override fun get_shutdown_scriptpubkey(): ShutdownScript {
        val address = Address(OnchainWallet.getNewAddress())
        val payload: Payload = address.payload()

        when (payload) {
            is Payload.WitnessProgram -> {
                return ShutdownScript.new_witness_program(
                    WitnessVersion(payload.version.name.toByte()),
                    payload.program.toUByteArray().toByteArray()
                )
            }
            else -> {
                return this._shutdown_scriptpubkey
            }
        }
    }

Is it possible for ShutdownScript.new_witness_program to return a ShutdownScript like ShutdownScript.new_p2wsh and ShutdownScript new_p2wpkh instead of Result_ShutdownScriptInvalidShutdownScriptZ?

[wpaulino]

It returns Result_ShutdownScriptInvalidShutdownScriptZ because it can fail. I'm not familiar with Kotlin, but you'd need to check if the call failed or not to get a ShutdownScript out of it.

[ConorOkus]

Yeah it doesn't look like we expose a way to instantiate a new ShutdownScript here. Am I missing something? @tnull @TheBlueMatt ?

[tnull]

IIUC, you should be able to do something like:

val script = (result as Result_ShutdownScriptInvalidShutdownScriptZ.Result_ShutdownScriptInvalidShutdownScriptZ_OK).res

or similar (excuse my Kotlin).

[ConorOkus]

That worked @tnull, thanks