1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

//! Custom hash serialization to better support human-readable formats.

use serde::{Deserialize, Deserializer, Serialize, Serializer};

/// Serialize a fixed-size hash value (`ContentAddress`, `Signature`).
pub fn serialize<const N: usize, S>(bytes: &[u8; N], s: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
{
    if s.is_human_readable() {
        let string = hex::encode_upper(bytes);
        string.serialize(s)
    } else {
        bytes[..].serialize(s)
    }
}

/// Deserialize a fixed-size hash value (`ContentAddress`, `Signature`).
pub fn deserialize<'de, const N: usize, D>(d: D) -> Result<[u8; N], D::Error>
where
    D: Deserializer<'de>,
    [u8; N]: TryFrom<Vec<u8>>,
{
    let bytes: Vec<u8> = if d.is_human_readable() {
        let string = String::deserialize(d)?;
        hex::decode(string).map_err(serde::de::Error::custom)?
    } else {
        Vec::deserialize(d)?
    };
    let len = bytes.len();
    bytes.try_into().map_err(|_err| {
        let msg = format!("failed to convert `Vec<u8>` with length {len} to `[u8; {N}]`");
        serde::de::Error::custom(msg)
    })
}