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use std::cmp::Ordering;
use std::fmt;
use std::hash::{Hash, Hasher};
use std::ops::Deref;
use bitcoin::hashes::hash160;
use bitcoin::PublicKey;
pub use miniscript::{
descriptor::KeyMap, descriptor::Wildcard, Descriptor, DescriptorPublicKey, Legacy, Miniscript,
ScriptContext, Segwitv0,
};
use miniscript::{MiniscriptKey, ToPublicKey, TranslatePk};
use crate::wallet::utils::SecpCtx;
#[derive(Debug, Clone)]
pub struct DerivedDescriptorKey<'s>(DescriptorPublicKey, &'s SecpCtx);
impl<'s> DerivedDescriptorKey<'s> {
pub fn new(key: DescriptorPublicKey, secp: &'s SecpCtx) -> DerivedDescriptorKey<'s> {
if let DescriptorPublicKey::XPub(xpub) = &key {
assert!(xpub.wildcard == Wildcard::None)
}
DerivedDescriptorKey(key, secp)
}
}
impl<'s> Deref for DerivedDescriptorKey<'s> {
type Target = DescriptorPublicKey;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<'s> PartialEq for DerivedDescriptorKey<'s> {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
impl<'s> Eq for DerivedDescriptorKey<'s> {}
impl<'s> PartialOrd for DerivedDescriptorKey<'s> {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
self.0.partial_cmp(&other.0)
}
}
impl<'s> Ord for DerivedDescriptorKey<'s> {
fn cmp(&self, other: &Self) -> Ordering {
self.0.cmp(&other.0)
}
}
impl<'s> fmt::Display for DerivedDescriptorKey<'s> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl<'s> Hash for DerivedDescriptorKey<'s> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.0.hash(state);
}
}
impl<'s> MiniscriptKey for DerivedDescriptorKey<'s> {
type Hash = Self;
fn to_pubkeyhash(&self) -> Self::Hash {
DerivedDescriptorKey(self.0.to_pubkeyhash(), self.1)
}
fn is_uncompressed(&self) -> bool {
self.0.is_uncompressed()
}
fn serialized_len(&self) -> usize {
self.0.serialized_len()
}
}
impl<'s> ToPublicKey for DerivedDescriptorKey<'s> {
fn to_public_key(&self) -> PublicKey {
match &self.0 {
DescriptorPublicKey::SinglePub(ref spub) => spub.key.to_public_key(),
DescriptorPublicKey::XPub(ref xpub) => {
xpub.xkey
.derive_pub(self.1, &xpub.derivation_path)
.expect("Shouldn't fail, only normal derivations")
.public_key
}
}
}
fn hash_to_hash160(hash: &Self::Hash) -> hash160::Hash {
hash.to_public_key().to_pubkeyhash()
}
}
pub(crate) trait AsDerived {
fn as_derived<'s>(&self, index: u32, secp: &'s SecpCtx)
-> Descriptor<DerivedDescriptorKey<'s>>;
fn as_derived_fixed<'s>(&self, secp: &'s SecpCtx) -> Descriptor<DerivedDescriptorKey<'s>>;
}
impl AsDerived for Descriptor<DescriptorPublicKey> {
fn as_derived<'s>(
&self,
index: u32,
secp: &'s SecpCtx,
) -> Descriptor<DerivedDescriptorKey<'s>> {
self.derive(index).translate_pk_infallible(
|key| DerivedDescriptorKey::new(key.clone(), secp),
|key| DerivedDescriptorKey::new(key.clone(), secp),
)
}
fn as_derived_fixed<'s>(&self, secp: &'s SecpCtx) -> Descriptor<DerivedDescriptorKey<'s>> {
assert!(!self.is_deriveable());
self.as_derived(0, secp)
}
}