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use crate::error::{Error, Kind};
use serde::de::Error as _;
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::convert::TryFrom;
use std::{
fmt::{self, Debug, Display},
str::FromStr,
};
use subtle_encoding::{Encoding, Hex};
use tendermint_proto::Protobuf;
pub const SHA256_HASH_SIZE: usize = 32;
#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq)]
pub enum Algorithm {
Sha256,
}
#[derive(Copy, Clone, Hash, Eq, PartialEq, PartialOrd, Ord)]
pub enum Hash {
Sha256([u8; SHA256_HASH_SIZE]),
None,
}
impl Protobuf<Vec<u8>> for Hash {}
impl TryFrom<Vec<u8>> for Hash {
type Error = Error;
fn try_from(value: Vec<u8>) -> Result<Self, Self::Error> {
if value.is_empty() {
return Ok(Hash::None);
}
Hash::from_bytes(Algorithm::Sha256, &value)
}
}
impl From<Hash> for Vec<u8> {
fn from(value: Hash) -> Self {
match value {
Hash::Sha256(s) => s.to_vec(),
Hash::None => vec![],
}
}
}
impl Hash {
pub fn from_bytes(alg: Algorithm, bytes: &[u8]) -> Result<Hash, Error> {
if bytes.is_empty() {
return Ok(Hash::None);
}
match alg {
Algorithm::Sha256 => {
if bytes.len() == SHA256_HASH_SIZE {
let mut h = [0u8; SHA256_HASH_SIZE];
h.copy_from_slice(bytes);
Ok(Hash::Sha256(h))
} else {
Err(Kind::Parse
.context(format!("hash invalid length: {}", bytes.len()))
.into())
}
}
}
}
pub fn from_hex_upper(alg: Algorithm, s: &str) -> Result<Hash, Error> {
if s.is_empty() {
return Ok(Hash::None);
}
match alg {
Algorithm::Sha256 => {
let mut h = [0u8; SHA256_HASH_SIZE];
Hex::upper_case().decode_to_slice(s.as_bytes(), &mut h)?;
Ok(Hash::Sha256(h))
}
}
}
pub fn algorithm(self) -> Algorithm {
match self {
Hash::Sha256(_) => Algorithm::Sha256,
Hash::None => Algorithm::Sha256,
}
}
pub fn as_bytes(&self) -> &[u8] {
match self {
Hash::Sha256(ref h) => h.as_ref(),
Hash::None => &[],
}
}
pub fn is_empty(&self) -> bool {
self == &Hash::None
}
}
impl Debug for Hash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Hash::Sha256(_) => write!(f, "Hash::Sha256({})", self),
Hash::None => write!(f, "Hash::None"),
}
}
}
impl Default for Hash {
fn default() -> Self {
Hash::None
}
}
impl Display for Hash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let hex = match self {
Hash::Sha256(ref h) => Hex::upper_case().encode_to_string(h).unwrap(),
Hash::None => String::new(),
};
write!(f, "{}", hex)
}
}
impl FromStr for Hash {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Error> {
Self::from_hex_upper(Algorithm::Sha256, s)
}
}
impl<'de> Deserialize<'de> for Hash {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
let hex = String::deserialize(deserializer)?;
if hex.is_empty() {
Err(D::Error::custom("empty hash"))
} else {
Ok(Self::from_str(&hex).map_err(|e| D::Error::custom(format!("{}", e)))?)
}
}
}
impl Serialize for Hash {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
self.to_string().serialize(serializer)
}
}
pub mod allow_empty {
use super::*;
pub fn serialize<S>(value: &Hash, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
value.to_string().serialize(serializer)
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<Hash, D::Error>
where
D: Deserializer<'de>,
{
let hex = String::deserialize(deserializer)?;
Hash::from_str(&hex).map_err(serde::de::Error::custom)
}
}
#[derive(Clone)]
pub struct AppHash(Vec<u8>);
impl Protobuf<Vec<u8>> for AppHash {}
impl TryFrom<Vec<u8>> for AppHash {
type Error = Error;
fn try_from(value: Vec<u8>) -> Result<Self, Self::Error> {
Ok(AppHash(value))
}
}
impl From<AppHash> for Vec<u8> {
fn from(value: AppHash) -> Self {
value.0
}
}
impl AppHash {
pub fn value(&self) -> Vec<u8> {
self.0.clone()
}
pub fn from_hex_upper(s: &str) -> Result<Self, Error> {
if s.len() % 2 != 0 {
return Err(Kind::InvalidAppHashLength.into());
}
let mut h = vec![0; s.len() / 2];
Hex::upper_case().decode_to_slice(s.as_bytes(), &mut h)?;
Ok(AppHash(h))
}
}
impl AsRef<[u8]> for AppHash {
fn as_ref(&self) -> &[u8] {
self.0.as_ref()
}
}
impl Debug for AppHash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "hash::AppHash({:?})", self.0)
}
}
impl Display for AppHash {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"{}",
Hex::upper_case().encode_to_string(&self.0).unwrap()
)
}
}
impl PartialEq for AppHash {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
impl FromStr for AppHash {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Error> {
Self::from_hex_upper(s)
}
}