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71 lines
2.0 KiB
71 lines
2.0 KiB
use crate::bitcoin::{self, Address, PunishTimelock, Transaction, TxCancel};
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use ::bitcoin::util::bip143::SigHashCache;
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use ::bitcoin::{SigHash, SigHashType};
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use anyhow::{Context, Result};
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use miniscript::{Descriptor, DescriptorTrait};
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use std::collections::HashMap;
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#[derive(Clone, Debug)]
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pub struct TxPunish {
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inner: Transaction,
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digest: SigHash,
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cancel_output_descriptor: Descriptor<::bitcoin::PublicKey>,
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}
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impl TxPunish {
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pub fn new(
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tx_cancel: &TxCancel,
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punish_address: &Address,
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punish_timelock: PunishTimelock,
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) -> Self {
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let tx_punish = tx_cancel.build_spend_transaction(punish_address, Some(punish_timelock));
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let digest = SigHashCache::new(&tx_punish).signature_hash(
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0, // Only one input: cancel transaction
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&tx_cancel.output_descriptor.script_code(),
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tx_cancel.amount().as_sat(),
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SigHashType::All,
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);
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Self {
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inner: tx_punish,
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digest,
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cancel_output_descriptor: tx_cancel.output_descriptor.clone(),
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}
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}
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pub fn digest(&self) -> SigHash {
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self.digest
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}
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pub fn complete(
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self,
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tx_punish_sig_bob: bitcoin::Signature,
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a: bitcoin::SecretKey,
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B: bitcoin::PublicKey,
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) -> Result<Transaction> {
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let sig_a = a.sign(self.digest());
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let sig_b = tx_punish_sig_bob;
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let satisfier = {
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let mut satisfier = HashMap::with_capacity(2);
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let A = a.public().into();
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let B = B.into();
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// The order in which these are inserted doesn't matter
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satisfier.insert(A, (sig_a.into(), ::bitcoin::SigHashType::All));
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satisfier.insert(B, (sig_b.into(), ::bitcoin::SigHashType::All));
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satisfier
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};
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let mut tx_punish = self.inner;
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self.cancel_output_descriptor
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.satisfy(&mut tx_punish.input[0], satisfier)
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.context("Failed to satisfy inputs with given signatures")?;
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Ok(tx_punish)
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}
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}
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