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use bytes::Bytes;
use data_encoding::BASE64;
use thiserror::Error;
#[derive(PartialEq, Eq, Hash)]
pub struct B3Digest(Bytes);
// TODO: allow converting these errors to crate::Error
#[derive(Error, Debug, PartialEq)]
pub enum Error {
#[error("invalid digest length: {0}")]
InvalidDigestLen(usize),
}
pub const B3_LEN: usize = 32;
impl B3Digest {
pub fn as_slice(&self) -> &[u8] {
&self.0[..]
}
}
impl From<B3Digest> for bytes::Bytes {
fn from(val: B3Digest) -> Self {
val.0
}
}
impl From<blake3::Hash> for B3Digest {
fn from(value: blake3::Hash) -> Self {
Self(Bytes::copy_from_slice(value.as_bytes()))
}
}
impl From<digest::Output<blake3::Hasher>> for B3Digest {
fn from(value: digest::Output<blake3::Hasher>) -> Self {
let v = Into::<[u8; B3_LEN]>::into(value);
Self(Bytes::copy_from_slice(&v))
}
}
impl TryFrom<Vec<u8>> for B3Digest {
type Error = Error;
// constructs a [B3Digest] from a [Vec<u8>].
// Returns an error if the digest has the wrong length.
fn try_from(value: Vec<u8>) -> Result<Self, Self::Error> {
if value.len() != B3_LEN {
Err(Error::InvalidDigestLen(value.len()))
} else {
Ok(Self(value.into()))
}
}
}
impl TryFrom<bytes::Bytes> for B3Digest {
type Error = Error;
// constructs a [B3Digest] from a [bytes::Bytes].
// Returns an error if the digest has the wrong length.
fn try_from(value: bytes::Bytes) -> Result<Self, Self::Error> {
if value.len() != B3_LEN {
Err(Error::InvalidDigestLen(value.len()))
} else {
Ok(Self(value))
}
}
}
impl From<&[u8; B3_LEN]> for B3Digest {
fn from(value: &[u8; B3_LEN]) -> Self {
Self(value.to_vec().into())
}
}
impl From<B3Digest> for [u8; B3_LEN] {
fn from(value: B3Digest) -> Self {
value.0.to_vec().try_into().unwrap()
}
}
impl Clone for B3Digest {
fn clone(&self) -> Self {
Self(self.0.to_owned())
}
}
impl std::fmt::Display for B3Digest {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "b3:{}", BASE64.encode(&self.0))
}
}
impl std::fmt::Debug for B3Digest {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "b3:{}", BASE64.encode(&self.0))
}
}
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