text: //
  // WebSocketServer.cpp
  //
  // This sample demonstrates the WebSocket class.
  //
  // Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // SPDX-License-Identifier:	BSL-1.0
  //
  
  
  #include "Poco/Net/HTTPServer.h"
  #include "Poco/Net/HTTPRequestHandler.h"
  #include "Poco/Net/HTTPRequestHandlerFactory.h"
  #include "Poco/Net/HTTPServerParams.h"
  #include "Poco/Net/HTTPServerRequest.h"
  #include "Poco/Net/HTTPServerResponse.h"
  #include "Poco/Net/HTTPServerParams.h"
  #include "Poco/Net/ServerSocket.h"
  #include "Poco/Net/WebSocket.h"
  #include "Poco/Net/NetException.h"
  #include "Poco/Util/ServerApplication.h"
  #include "Poco/Util/Option.h"
  #include "Poco/Util/OptionSet.h"
  #include "Poco/Util/HelpFormatter.h"
  #include "Poco/Format.h"
  #include <iostream>
  
  
  using Poco::Net::ServerSocket;
  using Poco::Net::WebSocket;
  using Poco::Net::WebSocketException;
  using Poco::Net::HTTPRequestHandler;
  using Poco::Net::HTTPRequestHandlerFactory;
  using Poco::Net::HTTPServer;
  using Poco::Net::HTTPServerRequest;
  using Poco::Net::HTTPResponse;
  using Poco::Net::HTTPServerResponse;
  using Poco::Net::HTTPServerParams;
  using Poco::Timestamp;
  using Poco::ThreadPool;
  using Poco::Util::ServerApplication;
  using Poco::Util::Application;
  using Poco::Util::Option;
  using Poco::Util::OptionSet;
  using Poco::Util::HelpFormatter;
  
  
  class PageRequestHandler: public HTTPRequestHandler
  	/// Return a HTML document with some JavaScript creating
  	/// a WebSocket connection.
  {
  public:
  	void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
  	{
  		response.setChunkedTransferEncoding(true);
  		response.setContentType("text/html");
  		std::ostream& ostr = response.send();
  		ostr << "<html>";
  		ostr << "<head>";
  		ostr << "<title>WebSocketServer</title>";
  		ostr << "<script type=\"text/javascript\">";
  		ostr << "function WebSocketTest()";
  		ostr << "{";
  		ostr << "  if (\"WebSocket\" in window)";
  		ostr << "  {";
  		ostr << "    var ws = new WebSocket(\"ws://" << request.serverAddress().toString() << "/ws\");";
  		ostr << "    ws.onopen = function()";
  		ostr << "      {";
  		ostr << "        ws.send(\"Hello, world!\");";
  		ostr << "      };";
  		ostr << "    ws.onmessage = function(evt)";
  		ostr << "      { ";
  		ostr << "        var msg = evt.data;";
  		ostr << "        alert(\"Message received: \" + msg);";
  		ostr << "        ws.close();";
  		ostr << "      };";
  		ostr << "    ws.onclose = function()";
  		ostr << "      { ";
  		ostr << "        alert(\"WebSocket closed.\");";
  		ostr << "      };";
  		ostr << "  }";
  		ostr << "  else";
  		ostr << "  {";
  		ostr << "     alert(\"This browser does not support WebSockets.\");";
  		ostr << "  }";
  		ostr << "}";
  		ostr << "</script>";
  		ostr << "</head>";
  		ostr << "<body>";
  		ostr << "  <h1>WebSocket Server</h1>";
  		ostr << "  <p><a href=\"javascript:WebSocketTest()\">Run WebSocket Script</a></p>";
  		ostr << "</body>";
  		ostr << "</html>";
  	}
  };
  
  
  class WebSocketRequestHandler: public HTTPRequestHandler
  	/// Handle a WebSocket connection.
  {
  public:
  	void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
  	{
  		Application& app = Application::instance();
  		try
  		{
  			WebSocket ws(request, response);
  			app.logger().information("WebSocket connection established.");
  			char buffer[1024];
  			int flags;
  			int n;
  			do
  			{
  				n = ws.receiveFrame(buffer, sizeof(buffer), flags);
  				app.logger().information(Poco::format("Frame received (length=%d, flags=0x%x).", n, unsigned(flags)));
  				ws.sendFrame(buffer, n, flags);
  			}
  			while (n > 0 && (flags & WebSocket::FRAME_OP_BITMASK) != WebSocket::FRAME_OP_CLOSE);
  			app.logger().information("WebSocket connection closed.");
  		}
  		catch (WebSocketException& exc)
  		{
  			app.logger().log(exc);
  			switch (exc.code())
  			{
  			case WebSocket::WS_ERR_HANDSHAKE_UNSUPPORTED_VERSION:
  				response.set("Sec-WebSocket-Version", WebSocket::WEBSOCKET_VERSION);
  				// fallthrough
  			case WebSocket::WS_ERR_NO_HANDSHAKE:
  			case WebSocket::WS_ERR_HANDSHAKE_NO_VERSION:
  			case WebSocket::WS_ERR_HANDSHAKE_NO_KEY:
  				response.setStatusAndReason(HTTPResponse::HTTP_BAD_REQUEST);
  				response.setContentLength(0);
  				response.send();
  				break;
  			}
  		}
  	}
  };
  
  
  class RequestHandlerFactory: public HTTPRequestHandlerFactory
  {
  public:
  	HTTPRequestHandler* createRequestHandler(const HTTPServerRequest& request)
  	{
  		Application& app = Application::instance();
  		app.logger().information("Request from " 
  			+ request.clientAddress().toString()
  			+ ": "
  			+ request.getMethod()
  			+ " "
  			+ request.getURI()
  			+ " "
  			+ request.getVersion());
  			
  		for (HTTPServerRequest::ConstIterator it = request.begin(); it != request.end(); ++it)
  		{
  			app.logger().information(it->first + ": " + it->second);
  		}
  		
  		if(request.find("Upgrade") != request.end() && Poco::icompare(request["Upgrade"], "websocket") == 0)
  			return new WebSocketRequestHandler;
  		else
  			return new PageRequestHandler;
  	}
  };
  
  
  class WebSocketServer: public Poco::Util::ServerApplication
  	/// The main application class.
  	///
  	/// This class handles command-line arguments and
  	/// configuration files.
  	/// Start the WebSocketServer executable with the help
  	/// option (/help on Windows, --help on Unix) for
  	/// the available command line options.
  	///
  	/// To use the sample configuration file (WebSocketServer.properties),
  	/// copy the file to the directory where the WebSocketServer executable
  	/// resides. If you start the debug version of the WebSocketServer
  	/// (WebSocketServerd[.exe]), you must also create a copy of the configuration
  	/// file named WebSocketServerd.properties. In the configuration file, you
  	/// can specify the port on which the server is listening (default
  	/// 9980) and the format of the date/time string sent back to the client.
  	///
  	/// To test the WebSocketServer you can use any web browser (http://localhost:9980/).
  {
  public:
  	WebSocketServer(): _helpRequested(false)
  	{
  	}
  	
  	~WebSocketServer()
  	{
  	}
  
  protected:
  	void initialize(Application& self)
  	{
  		loadConfiguration(); // load default configuration files, if present
  		ServerApplication::initialize(self);
  	}
  		
  	void uninitialize()
  	{
  		ServerApplication::uninitialize();
  	}
  
  	void defineOptions(OptionSet& options)
  	{
  		ServerApplication::defineOptions(options);
  		
  		options.addOption(
  			Option("help", "h", "display help information on command line arguments")
  				.required(false)
  				.repeatable(false));
  	}
  
  	void handleOption(const std::string& name, const std::string& value)
  	{
  		ServerApplication::handleOption(name, value);
  
  		if (name == "help")
  			_helpRequested = true;
  	}
  
  	void displayHelp()
  	{
  		HelpFormatter helpFormatter(options());
  		helpFormatter.setCommand(commandName());
  		helpFormatter.setUsage("OPTIONS");
  		helpFormatter.setHeader("A sample HTTP server supporting the WebSocket protocol.");
  		helpFormatter.format(std::cout);
  	}
  
  	int main(const std::vector<std::string>& args)
  	{
  		if (_helpRequested)
  		{
  			displayHelp();
  		}
  		else
  		{
  			// get parameters from configuration file
  			unsigned short port = (unsigned short) config().getInt("WebSocketServer.port", 9980);
  			
  			// set-up a server socket
  			ServerSocket svs(port);
  			// set-up a HTTPServer instance
  			HTTPServer srv(new RequestHandlerFactory, svs, new HTTPServerParams);
  			// start the HTTPServer
  			srv.start();
  			// wait for CTRL-C or kill
  			waitForTerminationRequest();
  			// Stop the HTTPServer
  			srv.stop();
  		}
  		return Application::EXIT_OK;
  	}
  	
  private:
  	bool _helpRequested;
  };
  
  
  POCO_SERVER_MAIN(WebSocketServer)
  