huskarl-core 0.6.4

Base library for huskarl (OAuth2 client) ecosystem.
Documentation 
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pub mod base64url {
    use base64::{Engine, engine::general_purpose::URL_SAFE_NO_PAD};
    use serde::{Deserialize, Deserializer, Serializer};

    pub fn serialize<S: Serializer>(bytes: &[u8], s: S) -> Result<S::Ok, S::Error> {
        s.serialize_str(&URL_SAFE_NO_PAD.encode(bytes))
    }

    pub fn deserialize<'de, D: Deserializer<'de>>(d: D) -> Result<Vec<u8>, D::Error> {
        let s: String = Deserialize::deserialize(d)?;
        URL_SAFE_NO_PAD.decode(&s).map_err(serde::de::Error::custom)
    }
}

/// Returns `bytes` with leading zero bytes stripped, preserving at least one byte.
///
/// Per RFC 7518 ยง2, `Base64urlUInt` values must use the minimum number of octets.
pub(super) fn trim_leading_zeros(bytes: &[u8]) -> &[u8] {
    match bytes.iter().position(|&b| b != 0) {
        Some(i) => &bytes[i..],
        None => &[0],
    }
}

pub mod option_base64url_uint {
    use base64::{Engine, engine::general_purpose::URL_SAFE_NO_PAD};
    use serde::{Deserialize, Deserializer, Serializer};

    // serde's `#[serde(with)]` requires `&Option<T>`, not `Option<&T>`.
    #[allow(clippy::ref_option)]
    pub fn serialize<S: Serializer>(value: &Option<Vec<u8>>, s: S) -> Result<S::Ok, S::Error> {
        match value {
            Some(bytes) => {
                s.serialize_str(&URL_SAFE_NO_PAD.encode(super::trim_leading_zeros(bytes)))
            }
            None => s.serialize_none(),
        }
    }

    pub fn deserialize<'de, D: Deserializer<'de>>(d: D) -> Result<Option<Vec<u8>>, D::Error> {
        let s: Option<String> = Deserialize::deserialize(d)?;
        match s {
            Some(s) => URL_SAFE_NO_PAD
                .decode(&s)
                .map(Some)
                .map_err(serde::de::Error::custom),
            None => Ok(None),
        }
    }
}

pub mod option_base64url {
    use base64::{Engine, engine::general_purpose::URL_SAFE_NO_PAD};
    use serde::{Deserialize, Deserializer, Serializer};

    // serde's `#[serde(with)]` requires `&Option<T>`, not `Option<&T>`.
    #[allow(clippy::ref_option)]
    pub fn serialize<S: Serializer>(value: &Option<Vec<u8>>, s: S) -> Result<S::Ok, S::Error> {
        match value {
            Some(bytes) => s.serialize_str(&URL_SAFE_NO_PAD.encode(bytes)),
            None => s.serialize_none(),
        }
    }

    pub fn deserialize<'de, D: Deserializer<'de>>(d: D) -> Result<Option<Vec<u8>>, D::Error> {
        let s: Option<String> = Deserialize::deserialize(d)?;
        match s {
            Some(s) => URL_SAFE_NO_PAD
                .decode(&s)
                .map(Some)
                .map_err(serde::de::Error::custom),
            None => Ok(None),
        }
    }
}

pub mod base64url_uint {
    use base64::{Engine, engine::general_purpose::URL_SAFE_NO_PAD};
    use serde::{Deserialize, Deserializer, Serializer};

    pub fn serialize<S: Serializer>(bytes: &[u8], ser: S) -> Result<S::Ok, S::Error> {
        ser.serialize_str(&URL_SAFE_NO_PAD.encode(super::trim_leading_zeros(bytes)))
    }

    pub fn deserialize<'de, D: Deserializer<'de>>(de: D) -> Result<Vec<u8>, D::Error> {
        let s: String = Deserialize::deserialize(de)?;
        URL_SAFE_NO_PAD.decode(&s).map_err(serde::de::Error::custom)
    }
}