trustime 0.1.0

A client implementation of the Trustime trusted timestamp service protocol
Documentation 
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use crate::core::{Error, RawTime};
use std::time::Duration;
use p256::ecdsa::VerifyingKey;
use rand::{distr::Alphanumeric, Rng};
use reqwest::blocking::Client;

pub struct Trustime {
    service_url: String,
    verifying_key: VerifyingKey,
    client: Client,
}

impl Trustime {
    pub fn new(service_url: impl Into<String>, verifying_key: VerifyingKey) -> Self {
        Self {
            service_url: service_url.into(),
            verifying_key,
            client: Client::new(),
        }
    }
    pub fn now(&self) -> Result<Duration, Error> {
        let nonce = rand::rng()
            .sample_iter(Alphanumeric)
            .take(16)
            .map(char::from)
            .collect::<String>();
        Ok(
            self.client.get(&self.service_url)
                .query(&[("nonce", &nonce)])
                .send()?
                .json::<RawTime>()?
                .digest(&nonce, &self.verifying_key)?
        )
    }
}