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Merge rust-bitcoin/rust-bitcoin#936: Make TaprooBuilder::finalize able to return keyspend only 

7969b7a43e Make TaprooBuilder::finalize able to return keyspend only (Jeremy Rubin)

Pull request description:

ACKs for top commit:
  JeremyRubin:
    > ACK 7969b7a
  sanket1729:
    ACK 7969b7a43e
  apoelstra:
    ACK 7969b7a43e

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This commit is contained in:
sanket1729 2022-04-20 09:38:44 -07:00
parent a898797b07 7969b7a43e
commit 9f79f8d1ce
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1 changed files with 9 additions and 8 deletions
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17
src/util/taproot.rs
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@ -479,21 +479,22 @@ impl TaprootBuilder {
}
/// Creates a [`TaprootSpendInfo`] with the given internal key.
///
// TODO: in a future breaking API change, this no longer needs to return result
pub fn finalize<C: secp256k1::Verification>(
mut self,
secp: &Secp256k1<C>,
internal_key: UntweakedPublicKey,
) -> Result<TaprootSpendInfo, TaprootBuilderError> {
if self.branch.len() > 1 {
return Err(TaprootBuilderError::IncompleteTree);
}
let node = self
.branch
.pop()
.ok_or(TaprootBuilderError::EmptyTree)?
.expect("Builder invariant: last element of the branch must be some");
match self.branch.pop() {
None => Ok(TaprootSpendInfo::new_key_spend(secp, internal_key, None)),
Some(Some(node)) => {
Ok(TaprootSpendInfo::from_node_info(secp, internal_key, node))
}
_ => Err(TaprootBuilderError::IncompleteTree),
}
}
pub(crate) fn branch(&self) -> &[Option<NodeInfo>] {
&self.branch