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use std::ops::{Deref, DerefMut};
use headers::{Header, HeaderMapExt};
use crate::{error::ParseTypedHeaderError, FromRequest, Request, RequestBody, Result};
#[derive(Debug)]
pub struct TypedHeader<T>(pub T);
impl<T> Deref for TypedHeader<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T> DerefMut for TypedHeader<T> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<T: Header> TypedHeader<T> {
async fn internal_from_request(req: &Request) -> Result<Self, ParseTypedHeaderError> {
let value = req.headers().typed_try_get::<T>()?;
Ok(Self(value.ok_or_else(|| {
ParseTypedHeaderError::HeaderRequired(T::name().to_string())
})?))
}
}
#[async_trait::async_trait]
impl<'a, T: Header> FromRequest<'a> for TypedHeader<T> {
async fn from_request(req: &'a Request, _body: &mut RequestBody) -> Result<Self> {
Self::internal_from_request(req).await.map_err(Into::into)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{
handler,
web::headers::{ContentLength, Host},
Endpoint,
};
#[tokio::test]
async fn test_typed_header_extractor() {
#[handler(internal)]
async fn index(content_length: TypedHeader<ContentLength>) {
assert_eq!(content_length.0 .0, 3);
}
index
.call(Request::builder().header("content-length", 3).body("abc"))
.await
.unwrap();
}
#[tokio::test]
async fn test_typed_header_extractor_error() {
let (req, mut body) = Request::builder().body("abc").split();
let res = TypedHeader::<Host>::from_request(&req, &mut body).await;
match res.unwrap_err().downcast_ref::<ParseTypedHeaderError>() {
Some(ParseTypedHeaderError::HeaderRequired(name)) if name == "host" => {}
_ => panic!(),
}
}
}