attestation-doc-validation 0.10.0

//! Module to expose a minimal Time API which is available even when compiled to WASM.
//! This is a minimal version of <https://docs.rs/web-time/1.1.0/web_time> to meet the requirements of the attestation crate.
pub use core::time::Duration;
use std::time::SystemTimeError;
use thiserror::Error;

#[derive(Debug, Error)]
pub enum Error {
    #[error("Failed to compute seconds since the unix epoch")]
    TimeSinceUnixEpochError(#[from] SystemTimeError),
    #[error("Failed to compute seconds since the unix epoch")]
    NegativeTimestamp,
}

#[cfg(target_arch = "wasm32")]
mod wasm {
    use super::{Duration, Error};
    use wasm_bindgen::prelude::wasm_bindgen;

    #[wasm_bindgen]
    extern "C" {
        /// Type for the [`Date` object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date).
        type Date;

        /// Binding to [`Date.now()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/now).
        #[wasm_bindgen(static_method_of = Date)]
        fn now() -> f64;
    }

    pub fn epoch() -> Result<Duration, Error> {
        let signed_js_ts = Date::now() as i64;
        let js_ms = signed_js_ts
            .try_into()
            .map_err(|_| Error::NegativeTimestamp)?;
        Ok(Duration::from_millis(js_ms))
    }
}
#[cfg(target_arch = "wasm32")]
pub use wasm::*;

#[cfg(not(target_arch = "wasm32"))]
pub fn epoch() -> Result<Duration, Error> {
    Ok(std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH)?)
}