use http::{header, HeaderMap};
use mime::Mime;
use crate::{FromRequest, Request, RequestBody, Result};
#[derive(Debug, Clone)]
pub struct Accept(pub Vec<Mime>);
fn parse_accept(headers: &HeaderMap) -> Vec<Mime> {
let mut items = headers
.get_all(header::ACCEPT)
.iter()
.filter_map(|hval| hval.to_str().ok())
.flat_map(|s| s.split(',').map(str::trim))
.filter_map(|item| {
let mime: Mime = item.parse().ok()?;
let q = mime
.get_param("q")
.and_then(|value| Some((value.as_str().parse::<f32>().ok()? * 1000.0) as i32))
.unwrap_or(1000);
Some((mime, q))
})
.collect::<Vec<_>>();
items.sort_by(|(_, qa), (_, qb)| qb.cmp(qa));
items.into_iter().map(|(mime, _)| mime).collect()
}
impl<'a> FromRequest<'a> for Accept {
async fn from_request(req: &'a Request, _body: &mut RequestBody) -> Result<Self> {
Ok(Self(parse_accept(req.headers())))
}
}
#[cfg(test)]
mod tests {
use std::str::FromStr;
use super::*;
#[tokio::test]
async fn test_accept() {
let req = Request::builder()
.header(
header::ACCEPT,
"text/html, text/yaml;q=0.5, application/xhtml+xml, application/xml;q=0.9, */*;q=0.1",
)
.finish();
let accept = Accept::from_request_without_body(&req).await.unwrap();
assert_eq!(
accept.0,
&[
Mime::from_str("text/html").unwrap(),
Mime::from_str("application/xhtml+xml").unwrap(),
Mime::from_str("application/xml;q=0.9").unwrap(),
Mime::from_str("text/yaml;q=0.5").unwrap(),
Mime::from_str("*/*;q=0.1").unwrap()
]
);
}
}