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use std::fmt::{Debug, Display, Formatter, Pointer};
use std::ops::Deref;
use crypto::digest::Digest;
use crypto::sha1::Sha1;
use serde::{Deserialize, Deserializer};
use serde::de::{Error, Visitor};
use hex::{FromHex, ToHex};
// sha1 digests are 20 bytes long
pub const SHA1_DIGEST_BYTES: usize = 20;
pub type Sha1DigestBytes = [u8; SHA1_DIGEST_BYTES];
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone)]
pub struct Sha1Digest(pub Sha1DigestBytes);
impl Debug for Sha1Digest {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "Sha1Digest {{{}}}", self.0.encode_hex::<String>())
}
}
impl Display for Sha1Digest {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str(&self.0.encode_hex::<String>())
}
}
impl Sha1Digest {
pub fn verify(&self, s: &str) -> Result<(), Sha1Digest> {
let mut st = Sha1::new();
let mut dig = [0u8; SHA1_DIGEST_BYTES];
st.input_str(s);
st.result(&mut dig);
if self.0 == dig {
return Ok(());
}
Err(Sha1Digest(dig))
}
}
struct Sha1DigestVisitor;
impl <'a> Visitor<'a> for Sha1DigestVisitor {
type Value = Sha1Digest;
fn expecting(&self, formatter: &mut Formatter) -> std::fmt::Result {
write!(formatter, "a valid SHA-1 digest (40-character hex string)")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: Error,
{
Sha1DigestBytes::from_hex(v).map_err(|e| E::custom(e)).map(Sha1Digest)
}
}
impl<'a> Deserialize<'a> for Sha1Digest {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'a>,
{
deserializer.deserialize_any(Sha1DigestVisitor)
}
}
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