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use crate::error::{Error, Kind};
use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
use std::{
fmt::{self, Debug, Display},
str::FromStr,
};
use subtle::{self, ConstantTimeEq};
use subtle_encoding::hex;
pub const LENGTH: usize = 32;
#[derive(Copy, Clone, Hash, PartialEq)]
pub struct Hash([u8; LENGTH]);
impl Hash {
pub fn new(bytes: [u8; LENGTH]) -> Hash {
Hash(bytes)
}
pub fn as_bytes(&self) -> &[u8] {
&self.0[..]
}
}
impl AsRef<[u8]> for Hash {
fn as_ref(&self) -> &[u8] {
self.as_bytes()
}
}
impl ConstantTimeEq for Hash {
#[inline]
fn ct_eq(&self, other: &Hash) -> subtle::Choice {
self.as_bytes().ct_eq(other.as_bytes())
}
}
impl Display for Hash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for byte in &self.0 {
write!(f, "{:02X}", byte)?;
}
Ok(())
}
}
impl Debug for Hash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "transaction::Hash({})", self)
}
}
impl FromStr for Hash {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let bytes = hex::decode_upper(s)
.or_else(|_| hex::decode(s))
.map_err(|_| Kind::Parse.context("hash decode"))?;
if bytes.len() != LENGTH {
return Err(Kind::Parse.context("hash length").into());
}
let mut result_bytes = [0u8; LENGTH];
result_bytes.copy_from_slice(&bytes);
Ok(Hash(result_bytes))
}
}
impl<'de> Deserialize<'de> for Hash {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
Self::from_str(&s).map_err(|_| {
de::Error::custom(format!(
"expected {}-character hex string, got {:?}",
LENGTH * 2,
s
))
})
}
}
impl Serialize for Hash {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.to_string().serialize(serializer)
}
}