def handle_onchain_secretreveal(
initiator_state: InitiatorTransferState,
state_change: ContractReceiveSecretReveal,
channel_state: NettingChannelState,
) -> TransitionResult:
""" Validates and handles a ContractReceiveSecretReveal state change. """
valid_secret = state_change.secrethash == initiator_state.transfer.lock.secrethash
iteration = TransitionResult(initiator_state, list())
if valid_secret:
# Register LockedTransfer in secrethashes_to_onchain_unlockedlocks
# without removing the LockedTransfer from secrethashes_to_lockedlocks
channel.register_onchain_secret(
channel_state=channel_state,
secret=state_change.secret,
secrethash=state_change.secrethash,
delete_lock=False,
)
iteration.new_state = initiator_state
return iteration
