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#[cfg(feature = "serde")]
use serde_with::{As, DisplayFromStr};
use std::collections::HashMap;
use std::str::FromStr;
use amplify::Wrapper;
use bitcoin::Script;
use super::{Category, DeriveLockScript, Error, Expanded, Template, Variants};
use crate::bip32::UnhardenedIndex;
use crate::script::PubkeyScript;
#[cfg_attr(
feature = "serde",
derive(Serialize, Deserialize),
serde(crate = "serde_crate")
)]
#[derive(
Clone,
Ord,
PartialOrd,
Eq,
PartialEq,
Hash,
Debug,
Display,
StrictEncode,
StrictDecode,
)]
#[display("{variants}<{template}>")]
pub struct Generator {
pub template: Template,
#[cfg_attr(feature = "serde", serde(with = "As::<DisplayFromStr>"))]
pub variants: Variants,
}
#[derive(
Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug, Display, Error,
)]
#[display(doc_comments)]
pub struct GeneratorParseError;
impl FromStr for Generator {
type Err = GeneratorParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut split = s.trim_end_matches('>').split('<');
let me = Generator {
variants: split
.next()
.ok_or(GeneratorParseError)?
.parse()
.map_err(|_| GeneratorParseError)?,
template: split
.next()
.ok_or(GeneratorParseError)?
.parse()
.map_err(|_| GeneratorParseError)?,
};
if split.next().is_some() {
Err(GeneratorParseError)
} else {
Ok(me)
}
}
}
impl Generator {
pub fn descriptors(
&self,
index: UnhardenedIndex,
) -> Result<HashMap<Category, Expanded>, Error> {
let mut descriptors = HashMap::with_capacity(5);
let single = if let Template::SingleSig(_) = self.template {
Some(
self.template
.try_derive_public_key(index)
.expect("Can't fail"),
)
} else {
None
};
if self.variants.bare {
let d = if let Some(pk) = single {
Expanded::Pk(pk)
} else {
Expanded::Bare(
self.template
.derive_lock_script(index, Category::Bare)?
.into_inner()
.into(),
)
};
descriptors.insert(Category::Bare, d);
}
if self.variants.hashed {
let d = if let Some(pk) = single {
Expanded::Pkh(pk)
} else {
Expanded::Sh(
self.template
.derive_lock_script(index, Category::Hashed)?
.into(),
)
};
descriptors.insert(Category::Hashed, d);
}
if self.variants.nested {
let d = if let Some(pk) = single {
Expanded::ShWpkh(pk)
} else {
Expanded::ShWsh(
self.template
.derive_lock_script(index, Category::Nested)?
.into(),
)
};
descriptors.insert(Category::Nested, d);
}
if self.variants.segwit {
let d = if let Some(pk) = single {
Expanded::Wpkh(pk)
} else {
Expanded::Wsh(
self.template
.derive_lock_script(index, Category::SegWit)?
.into(),
)
};
descriptors.insert(Category::SegWit, d);
}
Ok(descriptors)
}
#[inline]
pub fn pubkey_scripts(
&self,
index: UnhardenedIndex,
) -> Result<HashMap<Category, Script>, Error> {
Ok(self
.descriptors(index)?
.into_iter()
.map(|(cat, descr)| (cat, PubkeyScript::from(descr).into()))
.collect())
}
}