http-file 0.2.0

file serving for http crate type
Documentation 
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use core::str::FromStr;

use http::{
    header::{HeaderValue, IF_MODIFIED_SINCE, IF_UNMODIFIED_SINCE},
    Request,
};
use httpdate::HttpDate;

use super::{buf::buf_write_header, error::ServeError, runtime::Meta};

pub(super) fn mod_date_check<Ext, M>(req: &Request<Ext>, meta: &mut M) -> Result<Option<HttpDate>, ServeError>
where
    M: Meta,
{
    let mod_date = match meta.modified() {
        Some(modified) => HttpDate::from(modified),
        None => {
            #[cold]
            #[inline(never)]
            fn precondition_check<Ext>(req: &Request<Ext>) -> Result<Option<HttpDate>, ServeError> {
                if req.headers().contains_key(IF_UNMODIFIED_SINCE) {
                    Err(ServeError::PreconditionFailed)
                } else {
                    Ok(None)
                }
            }

            return precondition_check(req);
        }
    };

    if let Some(ref date) = to_http_date(req.headers().get(IF_UNMODIFIED_SINCE)) {
        if date < &mod_date {
            return Err(ServeError::PreconditionFailed);
        }
    }

    if let Some(ref date) = to_http_date(req.headers().get(IF_MODIFIED_SINCE)) {
        if date >= &mod_date {
            return Err(ServeError::NotModified);
        }
    }

    Ok(Some(mod_date))
}

fn to_http_date(header: Option<&HeaderValue>) -> Option<HttpDate> {
    header.and_then(|v| {
        std::str::from_utf8(v.as_ref())
            .ok()
            .map(<HttpDate as FromStr>::from_str)
            .and_then(Result::ok)
    })
}

pub(super) fn date_to_header(date: HttpDate) -> HeaderValue {
    buf_write_header!(29, "{date}")
}