CODE EXAMPLE FOR PYTHON

pyteal atomic transfer

# This example is provided for informational purposes only and has not been audited for security.

from pyteal import *

"""Atomic Swap"""

alice = Addr("6ZHGHH5Z5CTPCF5WCESXMGRSVK7QJETR63M3NY5FJCUYDHO57VTCMJOBGY")
bob = Addr("7Z5PWO2C6LFNQFGHWKSK5H47IQP5OJW2M3HA2QPXTY3WTNP5NU2MHBW27M")
secret = Bytes("base32", "2323232323232323")
timeout = 3000


def htlc(
    tmpl_seller=alice,
    tmpl_buyer=bob,
    tmpl_fee=1000,
    tmpl_secret=secret,
    tmpl_hash_fn=Sha256,
    tmpl_timeout=timeout,
):

    fee_cond = Txn.fee() < Int(tmpl_fee)
    safety_cond = And(
        Txn.type_enum() == TxnType.Payment,
        Txn.close_remainder_to() == Global.zero_address(),
        Txn.rekey_to() == Global.zero_address(),
    )

    recv_cond = And(Txn.receiver() == tmpl_seller, tmpl_hash_fn(Arg(0)) == tmpl_secret)

    esc_cond = And(Txn.receiver() == tmpl_buyer, Txn.first_valid() > Int(tmpl_timeout))

    return And(fee_cond, safety_cond, Or(recv_cond, esc_cond))


if __name__ == "__main__":
    print(compileTeal(htlc(), mode=Mode.Signature, version=2))