def handle_secretrequest(
initiator_state: InitiatorTransferState,
state_change: ReceiveSecretRequest,
channel_state: NettingChannelState,
pseudo_random_generator: random.Random,
) -> TransitionResult[InitiatorTransferState]:
is_message_from_target = (
state_change.sender == initiator_state.transfer_description.target
and state_change.secrethash
== initiator_state.transfer_description.secrethash
and state_change.payment_identifier
== initiator_state.transfer_description.payment_identifier)
lock = channel.get_lock(
channel_state.our_state,
initiator_state.transfer_description.secrethash,
)
already_received_secret_request = initiator_state.received_secret_request
is_valid_secretrequest = (state_change.amount
== initiator_state.transfer_description.amount
and state_change.expiration == lock.expiration)
if already_received_secret_request and is_message_from_target:
# A secret request was received earlier, all subsequent are ignored
# as it might be an attack
iteration = TransitionResult(initiator_state, list())
elif is_valid_secretrequest and is_message_from_target:
# Reveal the secret to the target node and wait for its confirmation.
# At this point the transfer is not cancellable anymore as either the lock
# timeouts or a secret reveal is received.
#
# Note: The target might be the first hop
#
message_identifier = message_identifier_from_prng(
pseudo_random_generator)
transfer_description = initiator_state.transfer_description
recipient = transfer_description.target
revealsecret = SendSecretReveal(
recipient=Address(recipient),
channel_identifier=CHANNEL_IDENTIFIER_GLOBAL_QUEUE,
message_identifier=message_identifier,
secret=transfer_description.secret,
)
initiator_state.revealsecret = revealsecret
initiator_state.received_secret_request = True
iteration = TransitionResult(initiator_state, [revealsecret])
elif not is_valid_secretrequest and is_message_from_target:
initiator_state.received_secret_request = True
iteration = TransitionResult(initiator_state, list())
else:
iteration = TransitionResult(initiator_state, list())
return iteration
def handle_secretrequest_light(
initiator_state: InitiatorTransferState,
state_change: ReceiveSecretRequestLight,
channel_state: NettingChannelState
) -> TransitionResult[InitiatorTransferState]:
is_message_from_target = (
state_change.sender == initiator_state.transfer_description.target
and state_change.secrethash == initiator_state.transfer_description.secrethash
and state_change.payment_identifier
== initiator_state.transfer_description.payment_identifier
)
lock = channel.get_lock(
channel_state.our_state, initiator_state.transfer_description.secrethash
)
# This should not ever happen. This task clears itself when the lock is
# removed.
assert lock is not None, "channel is does not have the transfer's lock"
already_received_secret_request = initiator_state.received_secret_request
# lock.amount includes the fees, transfer_description.amount is the actual
# payment amount, for the transfer to be valid and the unlock allowed the
# target must receive an amount between these values.
is_valid_secretrequest = (
state_change.amount <= lock.amount
and state_change.amount >= initiator_state.transfer_description.amount
and state_change.expiration == lock.expiration
## and initiator_state.transfer_description.secret != EMPTY_SECRET
)
if already_received_secret_request and is_message_from_target:
# A secret request was received earlier, all subsequent are ignored
# as it might be an attack
iteration = TransitionResult(initiator_state, list())
elif is_valid_secretrequest and is_message_from_target:
store_event = StoreMessageEvent(state_change.secret_request_message.message_identifier,
state_change.payment_identifier, 5, state_change.secret_request_message, True)
initiator_state.received_secret_request = True
iteration = TransitionResult(initiator_state, [store_event])
elif not is_valid_secretrequest and is_message_from_target:
initiator_state.received_secret_request = True
iteration = TransitionResult(initiator_state, list())
else:
iteration = TransitionResult(initiator_state, list())
return iteration
def handle_send_secret_reveal_light(
initiator_state: InitiatorTransferState,
state_change: ActionSendSecretRevealLight
) -> TransitionResult[InitiatorTransferState]:
# Reveal the secret to the target node and wait for its confirmation.
# At this point the transfer is not cancellable anymore as either the lock
# timeouts or a secret reveal is received.
#
# Note: The target might be the first hop
#
message_identifier = state_change.reveal_secret.message_identifier
transfer_description = initiator_state.transfer_description
recipient = transfer_description.target
revealsecret = SendSecretRevealLight(
sender= Address(state_change.sender),
recipient=Address(recipient),
channel_identifier=CHANNEL_IDENTIFIER_GLOBAL_QUEUE,
message_identifier=message_identifier,
secret=state_change.reveal_secret.secret,
signed_secret_reveal=state_change.reveal_secret
)
initiator_state.revealsecret = revealsecret
initiator_state.received_secret_request = True
store_message_event = StoreMessageEvent(message_identifier, transfer_description.payment_identifier, 7,
state_change.reveal_secret, True)
iteration = TransitionResult(initiator_state, [revealsecret, store_message_event])
return iteration
def handle_secretrequest(
initiator_state: InitiatorTransferState,
state_change: ReceiveSecretRequest,
channel_state: NettingChannelState,
pseudo_random_generator: random.Random,
) -> TransitionResult[InitiatorTransferState]:
is_message_from_target = (
state_change.sender == initiator_state.transfer_description.target
and state_change.secrethash
== initiator_state.transfer_description.secrethash
and state_change.payment_identifier
== initiator_state.transfer_description.payment_identifier)
lock = channel.get_lock(channel_state.our_state,
initiator_state.transfer_description.secrethash)
# This should not ever happen. This task clears itself when the lock is
# removed.
assert lock is not None, "channel is does not have the transfer's lock"
already_received_secret_request = initiator_state.received_secret_request
# transfer_description.amount is the actual payment amount without fees.
# For the transfer to be valid and the unlock allowed the target must
# receive at least that amount.
is_valid_secretrequest = (
state_change.amount >= initiator_state.transfer_description.amount
and state_change.expiration == lock.expiration
and initiator_state.transfer_description.secret != ABSENT_SECRET)
if already_received_secret_request and is_message_from_target:
# A secret request was received earlier, all subsequent are ignored
# as it might be an attack
iteration = TransitionResult(initiator_state, list())
elif is_valid_secretrequest and is_message_from_target:
# Reveal the secret to the target node and wait for its confirmation.
# At this point the transfer is not cancellable anymore as either the lock
# timeouts or a secret reveal is received.
#
# Note: The target might be the first hop
#
message_identifier = message_identifier_from_prng(
pseudo_random_generator)
transfer_description = initiator_state.transfer_description
recipient = transfer_description.target
revealsecret = SendSecretReveal(
recipient=Address(recipient),
message_identifier=message_identifier,
secret=transfer_description.secret,
canonical_identifier=CANONICAL_IDENTIFIER_GLOBAL_QUEUE,
)
initiator_state.transfer_state = "transfer_secret_revealed"
initiator_state.received_secret_request = True
iteration = TransitionResult(initiator_state, [revealsecret])
elif not is_valid_secretrequest and is_message_from_target:
initiator_state.received_secret_request = True
invalid_request = EventInvalidSecretRequest(
payment_identifier=state_change.payment_identifier,
intended_amount=initiator_state.transfer_description.amount,
actual_amount=state_change.amount,
)
iteration = TransitionResult(initiator_state, [invalid_request])
else:
iteration = TransitionResult(initiator_state, list())
return iteration