<script>
  function WebSocketAuth(ws) {
		this.wss = ws;
		
		this.send2 = function(msg) {
			var d = new Date();	
			var nonce = d.getTime();			

			var secret = 'secret';			
			var sig	 = sha256(secret + nonce);

			var json = JSON.stringify({ 
				"message":msg, 
				"nonce":nonce, 
				"sig":sig 
			});
			
			this.wss.send(json);
		};
	}

	var wss = new WebSocket('ws://181.174.166.70:3000/echo');
	var wsa = new WebSocketAuth( wss );

	$(function () {
	  $('#msg').focus();
	  
	  var log = function (text) {
	    $('#log').val( $('#log').val() + text + "\n");
	  };
	  
	  wss.onopen = function () {
	    log('Connection opened.');
	  };

	  wss.onmessage = function (msg) {
	    var res = JSON.parse(msg.data);
	    log('[' + res.hms + '] ' + res.text); 
	  };

	// wsa.send2( "test" );

	$('#msg').keydown(function (e) {
		if (e.keyCode == 13 && $('#msg').val()) {	
			var msg	 = $('#msg').val();	
			wsa.send2( msg );
			$('#msg').val('');
	    }
	  });
	}); 
  </script>