server: make it possible to enable ws/http only (#939)

* server: make it possible to enable ws/http only

* Update server/src/server.rs

* Update server/src/server.rs

* Update server/src/server.rs

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com>

server/src/server.rs

@@ -155,6 +155,8 @@ where
 						conn_id: id,
 						logger: logger.clone(),
 						max_connections: self.cfg.max_connections,
+						enable_http: self.cfg.enable_http,
+						enable_ws: self.cfg.enable_ws,
 					};
 					process_connection(&self.service_builder, &connection_guard, data, socket, &mut connections);
 					id = id.wrapping_add(1);
@@ -193,6 +195,10 @@ struct Settings {
 	tokio_runtime: Option<tokio::runtime::Handle>,
 	/// The interval at which `Ping` frames are submitted.
 	ping_interval: Duration,
+	/// Enable HTTP.
+	enable_http: bool,
+	/// Enable WS.
+	enable_ws: bool,
 }
 
 impl Default for Settings {
@@ -207,6 +213,8 @@ impl Default for Settings {
 			allow_hosts: AllowHosts::Any,
 			tokio_runtime: None,
 			ping_interval: Duration::from_secs(60),
+			enable_http: true,
+			enable_ws: true,
 		}
 	}
 }
@@ -425,6 +433,26 @@ impl<B, L> Builder<B, L> {
 		}
 	}
 
+	/// Configure the server to only serve JSON-RPC HTTP requests.
+	///
+	/// Default: both http and ws are enabled.
+	pub fn http_only(mut self) -> Self {
+		self.settings.enable_http = true;
+		self.settings.enable_ws = false;
+		self
+	}
+
+	/// Configure the server to only serve JSON-RPC WebSocket requests.
+	///
+	/// That implies that server just denies HTTP requests which isn't a WebSocket upgrade request
+	///
+	/// Default: both http and ws are enabled.
+	pub fn ws_only(mut self) -> Self {
+		self.settings.enable_http = false;
+		self.settings.enable_ws = true;
+		self
+	}
+
 	/// Finalize the configuration of the server. Consumes the [`Builder`].
 	///
 	/// ```rust
@@ -547,6 +575,10 @@ pub(crate) struct ServiceData<L: Logger> {
 	pub(crate) logger: L,
 	/// Handle to hold a `connection permit`.
 	pub(crate) conn: Arc<OwnedSemaphorePermit>,
+	/// Enable HTTP.
+	pub(crate) enable_http: bool,
+	/// Enable WS.
+	pub(crate) enable_ws: bool,
 }
 
 /// JsonRPSee service compatible with `tower`.
@@ -589,7 +621,9 @@ impl<L: Logger> hyper::service::Service<hyper::Request<hyper::Body>> for TowerSe
 			return async { Ok(http::response::host_not_allowed()) }.boxed();
 		}
 
-		if is_upgrade_request(&request) {
+		let is_upgrade_request = is_upgrade_request(&request);
+
+		if self.inner.enable_ws && is_upgrade_request {
 			let mut server = soketto::handshake::http::Server::new();
 
 			let response = match server.receive_request(&request) {
@@ -626,7 +660,7 @@ impl<L: Logger> hyper::service::Service<hyper::Request<hyper::Body>> for TowerSe
 			};
 
 			async { Ok(response) }.boxed()
-		} else {
+		} else if self.inner.enable_http && !is_upgrade_request {
 			// The request wasn't an upgrade request; let's treat it as a standard HTTP request:
 			let data = http::HandleRequest {
 				methods: self.inner.methods.clone(),
@@ -643,6 +677,8 @@ impl<L: Logger> hyper::service::Service<hyper::Request<hyper::Body>> for TowerSe
 			self.inner.logger.on_connect(self.inner.remote_addr, &request, TransportProtocol::Http);
 
 			Box::pin(http::handle_request(request, data).map(Ok))
+		} else {
+			Box::pin(async { http::response::denied() }.map(Ok))
 		}
 	}
 }
@@ -730,6 +766,10 @@ struct ProcessConnection<L> {
 	conn_id: u32,
 	/// Logger.
 	logger: L,
+	/// Allow JSON-RPC HTTP requests.
+	enable_http: bool,
+	/// Allow JSON-RPC WS request and WS upgrade requests.
+	enable_ws: bool,
 }
 
 #[instrument(name = "connection", skip_all, fields(remote_addr = %cfg.remote_addr, conn_id = %cfg.conn_id), level = "INFO")]
@@ -787,6 +827,8 @@ fn process_connection<'a, L: Logger, B, U>(
 			conn_id: cfg.conn_id,
 			logger: cfg.logger,
 			conn: Arc::new(conn),
+			enable_http: cfg.enable_http,
+			enable_ws: cfg.enable_ws,
 		},
 	};
 

server/src/tests/shared.rs

 use crate::tests::helpers::{init_logger, server_with_handles};
+use http::StatusCode;
 use jsonrpsee_core::Error;
-use jsonrpsee_test_utils::TimeoutFutureExt;
+use jsonrpsee_test_utils::{
+	helpers::{http_request, ok_response, to_http_uri},
+	mocks::{Id, WebSocketTestClient, WebSocketTestError},
+	TimeoutFutureExt,
+};
 use std::time::Duration;
 
 #[tokio::test]
@@ -35,3 +40,54 @@ async fn run_forever() {
 	// Send the shutdown request from one handle and await the server on the second one.
 	server_handle.stopped().with_timeout(TIMEOUT).await.unwrap();
 }
+
+#[tokio::test]
+async fn http_only_works() {
+	use crate::{RpcModule, ServerBuilder};
+
+	let server =
+		ServerBuilder::default().http_only().build("127.0.0.1:0").with_default_timeout().await.unwrap().unwrap();
+	let mut module = RpcModule::new(());
+	module
+		.register_method("say_hello", |_, _| {
+			tracing::debug!("server respond to hello");
+			Ok("hello")
+		})
+		.unwrap();
+
+	let addr = server.local_addr().unwrap();
+	let _server_handle = server.start(module).unwrap();
+
+	let req = r#"{"jsonrpc":"2.0","method":"say_hello","id":1}"#;
+	let response = http_request(req.into(), to_http_uri(addr)).with_default_timeout().await.unwrap().unwrap();
+	assert_eq!(response.status, StatusCode::OK);
+	assert_eq!(response.body, ok_response("hello".to_string().into(), Id::Num(1)));
+
+	let err = WebSocketTestClient::new(addr).with_default_timeout().await.unwrap().unwrap_err();
+	assert!(matches!(err, WebSocketTestError::RejectedWithStatusCode(code) if code == 403));
+}
+
+#[tokio::test]
+async fn ws_only_works() {
+	use crate::{RpcModule, ServerBuilder};
+
+	let server = ServerBuilder::default().ws_only().build("127.0.0.1:0").with_default_timeout().await.unwrap().unwrap();
+	let mut module = RpcModule::new(());
+	module
+		.register_method("say_hello", |_, _| {
+			tracing::debug!("server respond to hello");
+			Ok("hello")
+		})
+		.unwrap();
+
+	let addr = server.local_addr().unwrap();
+	let _server_handle = server.start(module).unwrap();
+
+	let req = r#"{"jsonrpc":"2.0","method":"say_hello","id":1}"#;
+	let response = http_request(req.into(), to_http_uri(addr)).with_default_timeout().await.unwrap().unwrap();
+	assert_eq!(response.status, StatusCode::FORBIDDEN);
+
+	let mut client = WebSocketTestClient::new(addr).with_default_timeout().await.unwrap().unwrap();
+	let response = client.send_request_text(req.to_string()).await.unwrap();
+	assert_eq!(response, ok_response("hello".to_string().into(), Id::Num(1)));
+}

server/src/transport/http.rs

@@ -426,4 +426,9 @@ pub(crate) mod response {
 			TEXT,
 		)
 	}
+
+	/// Create a response for when the server denied the request.
+	pub(crate) fn denied() -> hyper::Response<hyper::Body> {
+		from_template(hyper::StatusCode::FORBIDDEN, "".to_owned(), TEXT)
+	}
 }