@target-uri not working for HTTP/1.0

[KrausMatthias]

Hi,

apparently signature validation fails for valid signatures when @target-uri is used on HTTP/1.0 requests.

In HTTP/1.0 the host is provided in the separate HOST header instead of in the uri, see following longstanding issue in hyper: hyperium/hyper#1612

Just checking the request.uri() as in

httpsig-rs/httpsig-hyper/src/hyper_http.rs

Line 891 in f8ab161

DerivedComponentName::TargetUri => vec![req_or_res.uri()?.to_string()],

does therefore not work for HTTP/1.0.

I have following horrendous hack in place to make it work with httpsig-hyper, but would be happy to add a PR if you have any idea on how to solve this cleanly within httpsig-hyper.

trait EffectiveUri {
    fn reconstruct_effective_uri(self, scheme: &Scheme) -> Self ;
}

impl EffectiveUri for http::request::Parts {
    fn reconstruct_effective_uri(mut self, scheme: &Scheme) -> Self {
        if self.uri.host().is_none()
            && let Some(host) = self.headers.get(HOST)
        {
            let mut parts = self.uri.into_parts();
            parts.scheme = Some(parts.scheme.unwrap_or(scheme.clone()));
            let host = host.to_str().ok();
            parts.authority = host.and_then(|host| Authority::from_str(host).ok());
            let effective_uri: Uri = parts.try_into().unwrap();
            self.uri = effective_uri;
        }
        self
    }
}