nzcp 1.0.2

An implementation of NZ COVID verification, New Zealand's proof of COVID-19 vaccination solution
Documentation 
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use chrono::NaiveDate;
use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
use thiserror::Error;

use super::Pass;

#[derive(Debug, Error)]
pub enum PublicCovidPassError {
    #[error("The given date of birth was invalid.")]
    InvalidDateOfBirth,
}

/// See: https://nzcp.covid19.health.nz/#publiccovidpass
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq)]
pub struct PublicCovidPass {
    /// Given name(s) of the subject of the pass.
    #[serde(rename = "givenName")]
    pub given_name: String,

    /// Family name(s) of the subject of the pass.
    #[serde(rename = "familyName")]
    pub family_name: Option<String>,

    /// Date of birth of the subject of the pass.
    #[serde(
        rename = "dob",
        serialize_with = "serialize_iso_8601_date",
        deserialize_with = "deserialize_iso_8601_date"
    )]
    pub date_of_birth: NaiveDate,
}

impl Pass for PublicCovidPass {
    const CREDENTIAL_TYPE: &'static str = "PublicCovidPass";

    const CONTEXT_URL: &'static str = "https://nzcp.covid19.health.nz/contexts/v1";
}

fn deserialize_iso_8601_date<'de, D>(deserializer: D) -> Result<NaiveDate, D::Error>
where
    D: Deserializer<'de>,
{
    let string: &str = Deserialize::deserialize(deserializer)?;
    NaiveDate::parse_from_str(string, "%Y-%m-%d")
        .map_err(|_| D::Error::custom(PublicCovidPassError::InvalidDateOfBirth))
}

fn serialize_iso_8601_date<S>(date: &NaiveDate, serializer: S) -> Result<S::Ok, S::Error>
where
    S: Serializer,
{
    date.format("%Y-%m-%d").to_string().serialize(serializer)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn serialize_deserialize_json() {
        let json = r#"{
            "givenName": "John Andrew",
            "familyName": "Doe",
            "dob": "1979-04-14"
        }"#;

        let pass: PublicCovidPass = serde_json::from_str(json).unwrap();
        assert_eq!(
            pass,
            PublicCovidPass {
                given_name: String::from("John Andrew"),
                family_name: Some(String::from("Doe")),
                date_of_birth: NaiveDate::from_ymd(1979, 04, 14),
            }
        );
        assert_eq!(
            serde_json::from_str::<serde_json::Value>(json).unwrap(),
            serde_json::to_value(&pass).unwrap()
        );
    }
}