reallyme-codec-base64url 0.3.1

Base64url codec utilities for ReallyMe Codec.
Documentation 
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// SPDX-FileCopyrightText: 2026 ReallyMe LLC
//
// SPDX-License-Identifier: MIT OR Apache-2.0

use serde::{Deserialize, Deserializer, Serializer};
use zeroize::Zeroizing;

use crate::{base64url_to_bytes, bytes_to_base64url};

/// Serialize optional bytes as an unpadded base64url string or `null`.
pub fn serialize<S>(bytes: &Option<Vec<u8>>, serializer: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
{
    match bytes {
        Some(value) => {
            let encoded = Zeroizing::new(bytes_to_base64url(value));
            serializer.serialize_some(encoded.as_str())
        }
        None => serializer.serialize_none(),
    }
}

/// Deserialize an optional unpadded base64url string.
pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<Vec<u8>>, D::Error>
where
    D: Deserializer<'de>,
{
    let encoded = Option::<String>::deserialize(deserializer)?;
    match encoded {
        Some(value) => base64url_to_bytes(&Zeroizing::new(value))
            .map(Some)
            .map_err(serde::de::Error::custom),
        None => Ok(None),
    }
}