def purchase_data(self) -> Purchase:
if self.is_purchase_data:
if not isinstance(self.script.values['data'], Purchase):
self.script.values['data'] = Purchase.from_bytes(
self.script.values['data'])
return self.script.values['data']
raise ValueError('Output does not have purchase data.')
def purchase(cls, claim_id: str, amount: int, merchant_address: bytes,
funding_accounts: List['Account'], change_account: 'Account'):
ledger, _ = cls.ensure_all_have_same_ledger_and_wallet(
funding_accounts, change_account)
payment = Output.pay_pubkey_hash(
amount, ledger.address_to_hash160(merchant_address))
data = Output.add_purchase_data(Purchase(claim_id))
return cls.create([], [payment, data], funding_accounts,
change_account)
def is_purchase_data(self) -> bool:
return self.script.is_return_data and (
isinstance(self.script.values['data'], Purchase) or
Purchase.has_start_byte(self.script.values['data'])
)