def message_to_sent_payment(msg: squeak_admin_pb2.SentPayment) -> SentPayment:
return SentPayment(
sent_payment_id=(msg.sent_payment_id
if msg.sent_payment_id > 0 else None),
created_time_ms=(msg.time_ms if msg.time_ms > 0 else None),
peer_address=message_to_peer_address(msg.peer_address),
squeak_hash=bytes.fromhex(msg.squeak_hash),
payment_hash=bytes.fromhex(msg.payment_hash),
secret_key=b'', # TODO: why does this field exist?
price_msat=msg.price_msat,
node_pubkey=msg.node_pubkey,
valid=msg.valid,
)
def gen_sent_payment(peer_address, squeak_hash, secret_key, price_msat, seller_pubkey):
payment_hash = gen_random_hash()
return SentPayment(
sent_payment_id=None,
created_time_ms=None,
peer_address=peer_address,
squeak_hash=squeak_hash,
payment_hash=payment_hash,
secret_key=secret_key,
price_msat=price_msat,
node_pubkey=seller_pubkey,
valid=True,
)
def sent_payment(
squeak_hash,
payment_hash,
secret_key,
price_msat,
seller_pubkey,
peer_address,
):
yield SentPayment(
sent_payment_id=None,
created_time_ms=None,
peer_address=peer_address,
squeak_hash=squeak_hash,
payment_hash=payment_hash,
secret_key=secret_key,
price_msat=price_msat,
node_pubkey=seller_pubkey,
valid=True,
)
def pay_offer(self, received_offer: ReceivedOffer) -> SentPayment:
"""Pay the offer that the buyer received from the seller.
Args:
received_offer: The details of the offer received by the buyer.
Returns:
SentPayment: A record of the sent payment.
"""
# Pay the invoice
payment = self.lightning_client.pay_invoice(
received_offer.payment_request)
preimage = payment.payment_preimage
if not preimage:
raise Exception("Payment failed with error: {}".format(
payment.payment_error))
# Calculate the secret key
nonce = received_offer.nonce
secret_key = subtract_tweak(preimage, nonce)
# Check if the secret key is valid for the preimage
point = get_payment_point_of_secret_key(secret_key)
valid = point == received_offer.payment_point
# Save the preimage of the sent payment
# peer_address = PeerAddress(
# network=received_offer.peer_address.network,
# host=received_offer.peer_address.host,
# port=received_offer.peer_address.port,
# )
return SentPayment(
sent_payment_id=None,
created_time_ms=None,
peer_address=received_offer.peer_address,
squeak_hash=received_offer.squeak_hash,
payment_hash=received_offer.payment_hash,
secret_key=secret_key,
price_msat=received_offer.price_msat,
node_pubkey=received_offer.destination,
valid=valid,
)