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use bitcoin::secp256k1::{All, Secp256k1};
use bitcoin::{absolute, Script, Sequence};
use miniscript::{MiniscriptKey, Satisfier, ToPublicKey};
pub trait IsDust {
fn is_dust(&self, script: &Script) -> bool;
}
impl IsDust for u64 {
fn is_dust(&self, script: &Script) -> bool {
*self < script.dust_value().to_sat()
}
}
pub struct After {
pub current_height: Option<u32>,
pub assume_height_reached: bool,
}
impl After {
pub(crate) fn new(current_height: Option<u32>, assume_height_reached: bool) -> After {
After {
current_height,
assume_height_reached,
}
}
}
pub(crate) fn check_nsequence_rbf(rbf: Sequence, csv: Sequence) -> bool {
if !rbf.is_relative_lock_time() {
return false;
}
if rbf.is_time_locked() != csv.is_time_locked() {
return false;
}
if rbf < csv {
return false;
}
true
}
impl<Pk: MiniscriptKey + ToPublicKey> Satisfier<Pk> for After {
fn check_after(&self, n: absolute::LockTime) -> bool {
if let Some(current_height) = self.current_height {
current_height >= n.to_consensus_u32()
} else {
self.assume_height_reached
}
}
}
pub struct Older {
pub current_height: Option<u32>,
pub create_height: Option<u32>,
pub assume_height_reached: bool,
}
impl Older {
pub(crate) fn new(
current_height: Option<u32>,
create_height: Option<u32>,
assume_height_reached: bool,
) -> Older {
Older {
current_height,
create_height,
assume_height_reached,
}
}
}
impl<Pk: MiniscriptKey + ToPublicKey> Satisfier<Pk> for Older {
fn check_older(&self, n: Sequence) -> bool {
if let Some(current_height) = self.current_height {
current_height
>= self
.create_height
.unwrap_or(0)
.checked_add(n.to_consensus_u32())
.expect("Overflowing addition")
} else {
self.assume_height_reached
}
}
}
pub(crate) type SecpCtx = Secp256k1<All>;
#[cfg(test)]
mod test {
pub(crate) const SEQUENCE_LOCKTIME_TYPE_FLAG: u32 = 1 << 22;
use super::{check_nsequence_rbf, IsDust};
use crate::bitcoin::{Address, Network, Sequence};
use core::str::FromStr;
#[test]
fn test_is_dust() {
let script_p2pkh = Address::from_str("1GNgwA8JfG7Kc8akJ8opdNWJUihqUztfPe")
.unwrap()
.require_network(Network::Bitcoin)
.unwrap()
.script_pubkey();
assert!(script_p2pkh.is_p2pkh());
assert!(545.is_dust(&script_p2pkh));
assert!(!546.is_dust(&script_p2pkh));
let script_p2wpkh = Address::from_str("bc1qxlh2mnc0yqwas76gqq665qkggee5m98t8yskd8")
.unwrap()
.require_network(Network::Bitcoin)
.unwrap()
.script_pubkey();
assert!(script_p2wpkh.is_p2wpkh());
assert!(293.is_dust(&script_p2wpkh));
assert!(!294.is_dust(&script_p2wpkh));
}
#[test]
fn test_check_nsequence_rbf_msb_set() {
let result = check_nsequence_rbf(Sequence(0x80000000), Sequence(5000));
assert!(!result);
}
#[test]
fn test_check_nsequence_rbf_lt_csv() {
let result = check_nsequence_rbf(Sequence(4000), Sequence(5000));
assert!(!result);
}
#[test]
fn test_check_nsequence_rbf_different_unit() {
let result =
check_nsequence_rbf(Sequence(SEQUENCE_LOCKTIME_TYPE_FLAG + 5000), Sequence(5000));
assert!(!result);
}
#[test]
fn test_check_nsequence_rbf_mask() {
let result = check_nsequence_rbf(Sequence(0x3f + 10_000), Sequence(5000));
assert!(result);
}
#[test]
fn test_check_nsequence_rbf_same_unit_blocks() {
let result = check_nsequence_rbf(Sequence(10_000), Sequence(5000));
assert!(result);
}
#[test]
fn test_check_nsequence_rbf_same_unit_time() {
let result = check_nsequence_rbf(
Sequence(SEQUENCE_LOCKTIME_TYPE_FLAG + 10_000),
Sequence(SEQUENCE_LOCKTIME_TYPE_FLAG + 5000),
);
assert!(result);
}
}