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use crate::response::IntoResponse;
use super::{rejection::*, FromRequest, RequestParts};
use async_trait::async_trait;
use std::ops::Deref;
#[derive(Debug, Clone)]
pub struct ContentLengthLimit<T, const N: u64>(pub T);
#[async_trait]
impl<T, B, const N: u64> FromRequest<B> for ContentLengthLimit<T, N>
where
T: FromRequest<B>,
T::Rejection: IntoResponse,
B: Send,
{
type Rejection = ContentLengthLimitRejection<T::Rejection>;
async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
let content_length = req
.headers()
.ok_or(ContentLengthLimitRejection::HeadersAlreadyExtracted(
HeadersAlreadyExtracted,
))?
.get(http::header::CONTENT_LENGTH);
let content_length =
content_length.and_then(|value| value.to_str().ok()?.parse::<u64>().ok());
if let Some(length) = content_length {
if length > N {
return Err(ContentLengthLimitRejection::PayloadTooLarge(
PayloadTooLarge,
));
}
} else {
return Err(ContentLengthLimitRejection::LengthRequired(LengthRequired));
};
let value = T::from_request(req)
.await
.map_err(ContentLengthLimitRejection::Inner)?;
Ok(Self(value))
}
}
impl<T, const N: u64> Deref for ContentLengthLimit<T, N> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}