face: Implement WebSocket channel, face, and factory.

Change-Id: Ic4dbb1abdbbdbec028746ba14b11be8ab9cc1edb
Refs: #1468
diff --git a/daemon/face/websocket-face.hpp b/daemon/face/websocket-face.hpp
new file mode 100644
index 0000000..3f2a932
--- /dev/null
+++ b/daemon/face/websocket-face.hpp
@@ -0,0 +1,77 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014  Regents of the University of California,
+ *                     Arizona Board of Regents,
+ *                     Colorado State University,
+ *                     University Pierre & Marie Curie, Sorbonne University,
+ *                     Washington University in St. Louis,
+ *                     Beijing Institute of Technology,
+ *                     The University of Memphis
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+#ifndef NFD_DAEMON_FACE_WEBSOCKET_FACE_HPP
+#define NFD_DAEMON_FACE_WEBSOCKET_FACE_HPP
+
+#include "face.hpp"
+#include "core/logger.hpp"
+
+#ifndef HAVE_WEBSOCKET
+#error "Cannot include this file when WebSocket support is not enabled"
+#endif // HAVE_WEBSOCKET
+
+#include "websocketpp.hpp"
+
+namespace nfd {
+
+namespace websocket {
+typedef boost::asio::ip::tcp::endpoint Endpoint;
+typedef websocketpp::server<websocketpp::config::asio> Server;
+} // namespace websocket
+
+
+/**
+ * \brief Implementation of Face abstraction that uses WebSocket
+ *        as underlying transport mechanism
+ */
+class WebSocketFace : public Face
+{
+public:
+  WebSocketFace(const FaceUri& remoteUri, const FaceUri& localUri,
+                websocketpp::connection_hdl hdl, websocket::Server& server);
+
+  // from Face
+  virtual void
+  sendInterest(const Interest& interest);
+
+  virtual void
+  sendData(const Data& data);
+
+  virtual void
+  close();
+
+  void
+  handleReceive(const std::string& msg);
+
+private:
+  websocketpp::connection_hdl m_handle;
+  websocket::Server& m_server;
+  bool m_closed;
+};
+
+} // namespace nfd
+
+#endif // NFD_DAEMON_FACE_WEBSOCKET_FACE_HPP