Refactoring dapps to support API endpoints. (#1542)

* Refactoring dapps to support API endpoints.

* Using ContentHandler for unauthorized requests

dapps/src/handlers/auth.rs

@@ -0,0 +1,44 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Authorization Handlers
+
+use hyper::{server, Decoder, Encoder, Next};
+use hyper::net::HttpStream;
+use hyper::status::StatusCode;
+
+pub struct AuthRequiredHandler;
+
+impl server::Handler<HttpStream> for AuthRequiredHandler {
+	fn on_request(&mut self, _request: server::Request<HttpStream>) -> Next {
+		Next::write()
+	}
+
+	fn on_request_readable(&mut self, _decoder: &mut Decoder<HttpStream>) -> Next {
+		Next::write()
+	}
+
+	fn on_response(&mut self, res: &mut server::Response) -> Next {
+		res.set_status(StatusCode::Unauthorized);
+		res.headers_mut().set_raw("WWW-Authenticate", vec![b"Basic realm=\"Parity\"".to_vec()]);
+		Next::write()
+	}
+
+	fn on_response_writable(&mut self, _encoder: &mut Encoder<HttpStream>) -> Next {
+		Next::end()
+	}
+}
+