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use crate::BoxError;
use crate::{
extract::{has_content_type, rejection::*, take_body, FromRequest, RequestParts},
response::IntoResponse,
};
use async_trait::async_trait;
use bytes::Bytes;
use http::{
header::{self, HeaderValue},
StatusCode,
};
use http_body::Full;
use hyper::Response;
use serde::{de::DeserializeOwned, Serialize};
use std::{
convert::Infallible,
ops::{Deref, DerefMut},
};
#[derive(Debug, Clone, Copy, Default)]
pub struct Json<T>(pub T);
#[async_trait]
impl<T, B> FromRequest<B> for Json<T>
where
T: DeserializeOwned,
B: http_body::Body + Send,
B::Data: Send,
B::Error: Into<BoxError>,
{
type Rejection = JsonRejection;
async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
use bytes::Buf;
if has_content_type(req, "application/json")? {
let body = take_body(req)?;
let buf = hyper::body::aggregate(body)
.await
.map_err(InvalidJsonBody::from_err)?;
let value = serde_json::from_reader(buf.reader()).map_err(InvalidJsonBody::from_err)?;
Ok(Json(value))
} else {
Err(MissingJsonContentType.into())
}
}
}
impl<T> Deref for Json<T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<T> DerefMut for Json<T> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<T> From<T> for Json<T> {
fn from(inner: T) -> Self {
Self(inner)
}
}
impl<T> IntoResponse for Json<T>
where
T: Serialize,
{
type Body = Full<Bytes>;
type BodyError = Infallible;
fn into_response(self) -> Response<Self::Body> {
let bytes = match serde_json::to_vec(&self.0) {
Ok(res) => res,
Err(err) => {
return Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.header(header::CONTENT_TYPE, "text/plain")
.body(Full::from(err.to_string()))
.unwrap();
}
};
let mut res = Response::new(Full::from(bytes));
res.headers_mut().insert(
header::CONTENT_TYPE,
HeaderValue::from_static("application/json"),
);
res
}
}