def redeem_voucher_check(user: User, voucher_user: VoucherUser, sc_address) -> Optional[str]:
# require(voucher[msg.sender].length > _index); - invariant
# require(v.used == false);
if voucher_user.usedVoucher is not False:
return "already used voucher"
# require(v.expires_unixtime >= block.timestamp);
if not voucher_user.expires_unixtime >= datetime.now():
return "voucher is expired"
if not WEB3.isAddress(sc_address):
return "invalid sc_address"
if user:
pass
return None
def voucher_constructor_check(institution_owner_address) -> Optional[str]:
if not WEB3.isAddress(institution_owner_address):
return "invalid public key"
return None
