delegate request body parsing to trait

gotham_restful/src/lib.rs

@@ -76,7 +76,10 @@ extern crate self as gotham_restful;
 #[macro_use] extern crate gotham_derive;
 #[macro_use] extern crate serde;
 
-pub use hyper::StatusCode;
+#[doc(no_inline)]
+pub use hyper::{Chunk, StatusCode};
+#[doc(no_inline)]
+pub use mime::Mime;
 
 pub use gotham_restful_derive::*;
 

gotham_restful/src/routing.rs

@@ -27,6 +27,7 @@ use gotham::{
 use hyper::{
 	header::CONTENT_TYPE,
 	Body,
+	HeaderMap,
 	Method
 };
 use mime::{Mime, APPLICATION_JSON};
@@ -144,7 +145,7 @@ where
 
 fn handle_with_body<Body, F, R>(mut state : State, get_result : F) -> Box<HandlerFuture>
 where
-	Body : DeserializeOwned,
+	Body : RequestBody,
 	F : FnOnce(&mut State, Body) -> R + Send + 'static,
 	R : ResourceResult
 {
@@ -157,7 +158,15 @@ where
 				Err(e) => return err((state, e.into_handler_error()))
 			};
 			
-			let body = match serde_json::from_slice(&body) {
+			let content_type : Mime = match HeaderMap::borrow_from(&state).get(CONTENT_TYPE) {
+				Some(content_type) => content_type.to_str().unwrap().parse().unwrap(),
+				None => {
+					let res = create_empty_response(&state, StatusCode::UNSUPPORTED_MEDIA_TYPE);
+					return ok((state, res))
+				}
+			};
+
+			let body = match Body::from_body(body, content_type) {
 				Ok(body) => body,
 				Err(e) => return {
 					let error : ResourceError = e.into();

gotham_restful/src/types.rs

@@ -1,6 +1,8 @@
 #[cfg(feature = "openapi")]
-use crate::OpenapiType;
+use crate::{OpenapiType, result::ResourceError};
 
+use hyper::Chunk;
+use mime::{Mime, APPLICATION_JSON};
 use serde::{de::DeserializeOwned, Serialize};
 
 #[cfg(not(feature = "openapi"))]
@@ -39,10 +41,31 @@ impl<T : ResourceType + Serialize> ResponseBody for T
 /// A type that can be used inside a request body. Implemented for every type that is
 /// deserializable with serde. If the `openapi` feature is used, it must also be of type
 /// `OpenapiType`.
-pub trait RequestBody : ResourceType + DeserializeOwned
+pub trait RequestBody : ResourceType + Sized
 {
+	type Err : Into<ResourceError>;
+	
+	/// Return all types that are supported as content types
+	fn supported_types() -> Option<Vec<Mime>>
+	{
+		None
+	}
+	
+	/// Create the request body from a raw body and the content type.
+	fn from_body(body : Chunk, content_type : Mime) -> Result<Self, Self::Err>;
 }
 
 impl<T : ResourceType + DeserializeOwned> RequestBody for T
 {
+	type Err = serde_json::Error;
+	
+	fn supported_types() -> Option<Vec<Mime>>
+	{
+		Some(vec![APPLICATION_JSON])
+	}
+	
+	fn from_body(body : Chunk, _content_type : Mime) -> Result<Self, Self::Err>
+	{
+		serde_json::from_slice(&body)
+	}
 }