leduyquang753 · November 4, 2024 09:13 · leduyquang753 · Nov 6, 2021 · StevenRott · Nov 7, 2021
diff --git a/Buzzers test.pptm b/Buzzers test.pptm
diff --git a/getHash.js b/getHash.js
 /*	KEY GENERATOR – NodeJS

 	Replace the strings with the keys you want and run with NodeJS.
 	It will generate the hashes for you to install into the server script.
 	
 	Copyright © 2019 Le Duy Quang. Licensed under MIT.
 */

 const inputStrings = ["Lorem ipsum","dolor sit amet"]; // Input strings.

 const shaUtil = require('js-sha256');

 String.prototype.hashCode = function() {
  return shaUtil(String(this));
 };

 inputStrings.forEach((s, i) => {console.log(s + ' ' + s.hashCode());});
diff --git a/PowerPoint buzzer.md b/PowerPoint buzzer.md
diff --git a/receiver.py b/receiver.py
 """	BUZZER SIGNAL RECEIVER – Python
 	
 	Required external modules:
 	– pywin32
 	– websockets
 	
 	When running, be sure to have the presentation opened and VBA loaded.
 	
 	Copyright © 2019 Le Duy Quang. Licensed under MIT.
 """

 serverAddress = 'ws://localhost:2909' # The server's address.
 clientKey = 'Y*!TTGBg7t1hhh$T&g@*T@*(THBhGiwiohoiu2^*(^' # The client key corresponding to the receiver's hash.
 buzzerSoundFile = 'buzzer.wav' # The name/path of the buzzer sound file.

 import asyncio
 import websockets
 from win32com.client import Dispatch
 import winsound
 from threading import Thread

 app = Dispatch('PowerPoint.Application')

 def playBuzzerSound():
 	global buzzerSoundFile
 	winsound.PlaySound(buzzerSoundFile, winsound.SND_FILENAME+winsound.SND_ASYNC)

 async def mainFunction():
 	global serverAddress, clientKey
 	async with websockets.connect(serverAddress) as ws:
 		await ws.send('PASSWORD: ' + clientKey)
 		while True:
 			msg = await ws.recv()
 			if msg.startswith('BUZZER '):
 				if app.Run('onBuzzerActivated', int(msg[7:])):
 					Thread(target=playBuzzerSound).start();

 asyncio.get_event_loop().run_until_complete(mainFunction())
diff --git a/sender.html b/sender.html
 <!--
 	BUZZER BUTTON CLIENT – HTML
 	
 	Runs out of the box on any modern browser. The whole screen is the button.
 	
 	Copyright © 2019 Le Duy Quang. Licensed under MIT.
 -->
 <html>
 	<head>
 		<meta name="viewport" content="width=device-width, initial-scale=1">
 		<title>Buzzer</title>
 		<style>
 			#settingsButton {
 				background-color: RGBA(0,0,0,0.05);
 				bottom: 0px;
 				left: 0px;
 				width: 10%;
 				height: 10%;
 				position: absolute;
 			}
 			#notifications {
 				position: absolute;
 				top: 0px;
 				left: 0px;
 				width: 100%;
 				font-family: Segoe UI, Arial, sans-serif;
 				font-size: 1em;
 				text-align: center;
 			}
 			#buzzerArea {
 				width: 100%;
 				height: 100%;
 			}
 		</style>
 	</head>
 	<body>
 		<div id=buzzerArea hidden></div>
 		<div id=settingsButton onclick="enterPassword(event)" hidden></div>
 		<div id=notifications></div>
 		<script>
 			const serverAddress = 'ws://localhost:2909'; // The server's address.
 			
 			function enterPassword(event) {
 				event.preventDefault();
 				ws.send('PASSWORD: '+prompt('Enter the client key:'));
 			}
 			
 			function sendBuzzer(event) {
 				ws.send('BUZZER');
 			}
 			
 			var ws = new WebSocket(serverAddress);
 			var notif = document.getElementById('notifications');
 			var buzzerArea = document.getElementById('buzzerArea');
 			var settingsButton = document.getElementById('settingsButton');
 			document.getElementById('buzzerArea').addEventListener('click', sendBuzzer);
 			
 			ws.onerror = function() {
 				document.bgColor = '#FFA5A5';
 				notif.style.color = '#600000';
 				notif.innerHTML = '<b>ERROR:</b> Failed to connect to the server.<br/>Please contact the operator and reload this page when the issue has been fixed.';
 			};
 			ws.onopen = function() {
 				document.bgColor = '#FFF1A2';
 				notif.style.color = '#806C00';
 				notif.innerHTML = "This device has connected to the server but is not yet authenticated.<br/>Tap the lower-left corner of the screen to enter the client key in order to connect.";
 				settingsButton.hidden = false;
 				ws.onclose = function() {
 					document.bgColor = '#FFA5A5';
 					notif.style.color = '#600000';
 					notif.innerHTML = '<b>ERROR:</b> Server connection has been interrupted.<br/>Please contact the operator and reload this page when the issue has been fixed.';
 					buzzerArea.hidden = true;
 					settingsButton.hidden = true;
 					document.removeEventListener('keypress', sendBuzzer);
 				};
 			};
 			ws.onmessage = function(msg) {
 				if (msg.data == 'CONNECTED SUCCESSFULLY') {
 					document.bgColor = '#BCFFA9';
 					notif.innerHTML = '';
 					buzzerArea.hidden = false;
 					document.addEventListener('keypress', sendBuzzer);
 				}
 			};
 		</script>
 	</body>
 </html>
diff --git a/server.js b/server.js
 /*	BUZZER SERVER SCRIPT – NodeJS
 	
 	Required external libraries:
 	– ws
 	– js-sha256
 	
 	Copyright © 2019 Le Duy Quang. Licensed under MIT.
 */

 const WebSocket = require('ws');
 const shaUtil = require('js-sha256');

 String.prototype.hashCode = function() {
  return shaUtil(String(this));
 };

 const server = new WebSocket.Server({port:2909}); // Change to another port if you like.
 // Hashes of client keys. Generate them using getHash.js and place them here.
 const passes = {
 	'5eaa7a23eeb4ee86c30ec40dabe1e28f858342b2c83a92ffdcc735035511b68b': 0, // Receiver's key.
 	'40144db4eddf4c7ebef6629de3442f66bab5899e5f6bd308cd30919f16ae4963': 1, // Buzzer #1's key.
 	'9c339dbba7919d475985543e53b136e6d54a2ee3d1af5f0748566b060144dd69': 2, // Buzzer #2's key...
 	'7d43b0053a9da7b83b321cd461646c3dec646cb3fa45374f86cbebfb2ea43736': 3,
 	'ac1ead30257f32bf02ea5dff55597b6c525d8626d2799c6b2b9650387bb914da': 4
 };
 var receiver = null;
 var senders = {1: null, 2: null, 3: null, 4: null}; // You can add more/remove buzzers if you want to.

 const lockClients = true; // If it is true, a connected client will not be overriden by another client logging in until it disconnects.
 if (lockClients) canConnect = function(id) {
 	if (id == 0) return receiver === null;
 	return senders[id] === null;
 }
 else canConnect = function(id) {
 	return true;
 }

 function processBuzzer(client) {
 	if (receiver == null) return;
 	receiver.send('BUZZER '+client.buzzerId);
 	//console.log('Buzzer #'+client.buzzerId+' is activated.');
 }

 function onDisconnect(id) {
 	if (id === 0) {
 		receiver = null;
 		console.log('Receiver has disconnected.');
 	} else {
 		senders[id] = null;
 		console.log('Sender #' + id + ' has disconnected.');
 	}
 }

 server.on('connection', function(client) {
 	client.sendBuzzer = function() {};
 	client.on('message', function(message) {
 		if (message.startsWith('PASSWORD: ')) {
 			let id = passes[message.substring(10).hashCode()];
 			if (id !== undefined && canConnect(id)) {
 				if (client.buzzerId !== undefined) onDisconnect(client.buzzerId);
 				client.buzzerId = id;
 				if (id === 0) {
 					receiver = client;
 					console.log('Receiver has connected.');
 				} else {
 					senders[id] = client;
 					console.log('Sender #' + id + ' has connected.');
 					client.sendBuzzer = function() { processBuzzer(this) };
 					client.send('CONNECTED SUCCESSFULLY');
 				}
 			}
 		}
 		if (message == 'BUZZER') client.sendBuzzer();
 	});
 	client.on('close', function() {
 		if (client.buzzerId !== undefined) onDisconnect(client.buzzerId);
 	});
 });

 console.log('Server is running.');
diff --git a/VBACode.vb b/VBACode.vb
 Const slideNumber As Integer = 1 ' The slide number in your presentation.
 Dim shouldAcceptBuzzers As Boolean
 Dim theSlide As Slide
 Sub BuzzersResetAll()
    Set theSlide = ActivePresentation.Slides(1)
    Dim i As Integer
    For i = 1 To 4
        theSlide.Shapes("Team " + CStr(i) + " buzzer").Fill.ForeColor.RGB = 16777215
    Next i
    shouldAcceptBuzzers = True
 End Sub
 Function onBuzzerActivated(ByVal team As Integer)
    If Not shouldAcceptBuzzers Then
        onBuzzerActivated = False
        Exit Function
    End If
    theSlide.Shapes("Team " + CStr(team) + " buzzer").Fill.ForeColor.RGB = 9306037
    shouldAcceptBuzzers = False
    onBuzzerActivated = True
 End Function
	/* KEY GENERATOR – NodeJS

	Replace the strings with the keys you want and run with NodeJS.
	It will generate the hashes for you to install into the server script.

	Copyright © 2019 Le Duy Quang. Licensed under MIT.
	*/

	const inputStrings = ["Lorem ipsum","dolor sit amet"]; // Input strings.

	const shaUtil = require('js-sha256');

	String.prototype.hashCode = function() {
	return shaUtil(String(this));
	};

	inputStrings.forEach((s, i) => {console.log(s + ' ' + s.hashCode());});
	""" BUZZER SIGNAL RECEIVER – Python

	Required external modules:
	– pywin32
	– websockets

	When running, be sure to have the presentation opened and VBA loaded.

	Copyright © 2019 Le Duy Quang. Licensed under MIT.
	"""

	serverAddress = 'ws://localhost:2909' # The server's address.
	clientKey = 'Y!TTGBg7t1hhh$T&g@T@(THBhGiwiohoiu2^(^' # The client key corresponding to the receiver's hash.
	buzzerSoundFile = 'buzzer.wav' # The name/path of the buzzer sound file.

	import asyncio
	import websockets
	from win32com.client import Dispatch
	import winsound
	from threading import Thread

	app = Dispatch('PowerPoint.Application')

	def playBuzzerSound():
	global buzzerSoundFile
	winsound.PlaySound(buzzerSoundFile, winsound.SND_FILENAME+winsound.SND_ASYNC)

	async def mainFunction():
	global serverAddress, clientKey
	async with websockets.connect(serverAddress) as ws:
	await ws.send('PASSWORD: ' + clientKey)
	while True:
	msg = await ws.recv()
	if msg.startswith('BUZZER '):
	if app.Run('onBuzzerActivated', int(msg[7:])):
	Thread(target=playBuzzerSound).start();

	asyncio.get_event_loop().run_until_complete(mainFunction())
	<!--
	BUZZER BUTTON CLIENT – HTML

	Runs out of the box on any modern browser. The whole screen is the button.

	Copyright © 2019 Le Duy Quang. Licensed under MIT.
	-->
	<html>
	<head>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Buzzer</title>
	<style>
	#settingsButton {
	background-color: RGBA(0,0,0,0.05);
	bottom: 0px;
	left: 0px;
	width: 10%;
	height: 10%;
	position: absolute;
	}
	#notifications {
	position: absolute;
	top: 0px;
	left: 0px;
	width: 100%;
	font-family: Segoe UI, Arial, sans-serif;
	font-size: 1em;
	text-align: center;
	}
	#buzzerArea {
	width: 100%;
	height: 100%;
	}
	</style>
	</head>
	<body>
	<div id=buzzerArea hidden></div>
	<div id=settingsButton onclick="enterPassword(event)" hidden></div>
	<div id=notifications></div>
	<script>
	const serverAddress = 'ws://localhost:2909'; // The server's address.

	function enterPassword(event) {
	event.preventDefault();
	ws.send('PASSWORD: '+prompt('Enter the client key:'));
	}

	function sendBuzzer(event) {
	ws.send('BUZZER');
	}

	var ws = new WebSocket(serverAddress);
	var notif = document.getElementById('notifications');
	var buzzerArea = document.getElementById('buzzerArea');
	var settingsButton = document.getElementById('settingsButton');
	document.getElementById('buzzerArea').addEventListener('click', sendBuzzer);

	ws.onerror = function() {
	document.bgColor = '#FFA5A5';
	notif.style.color = '#600000';
	notif.innerHTML = '<b>ERROR:</b> Failed to connect to the server.<br/>Please contact the operator and reload this page when the issue has been fixed.';
	};
	ws.onopen = function() {
	document.bgColor = '#FFF1A2';
	notif.style.color = '#806C00';
	notif.innerHTML = "This device has connected to the server but is not yet authenticated.<br/>Tap the lower-left corner of the screen to enter the client key in order to connect.";
	settingsButton.hidden = false;
	ws.onclose = function() {
	document.bgColor = '#FFA5A5';
	notif.style.color = '#600000';
	notif.innerHTML = '<b>ERROR:</b> Server connection has been interrupted.<br/>Please contact the operator and reload this page when the issue has been fixed.';
	buzzerArea.hidden = true;
	settingsButton.hidden = true;
	document.removeEventListener('keypress', sendBuzzer);
	};
	};
	ws.onmessage = function(msg) {
	if (msg.data == 'CONNECTED SUCCESSFULLY') {
	document.bgColor = '#BCFFA9';
	notif.innerHTML = '';
	buzzerArea.hidden = false;
	document.addEventListener('keypress', sendBuzzer);
	}
	};
	</script>
	</body>
	</html>
	/* BUZZER SERVER SCRIPT – NodeJS

	Required external libraries:
	– ws
	– js-sha256

	Copyright © 2019 Le Duy Quang. Licensed under MIT.
	*/

	const WebSocket = require('ws');
	const shaUtil = require('js-sha256');

	String.prototype.hashCode = function() {
	return shaUtil(String(this));
	};

	const server = new WebSocket.Server({port:2909}); // Change to another port if you like.
	// Hashes of client keys. Generate them using getHash.js and place them here.
	const passes = {
	'5eaa7a23eeb4ee86c30ec40dabe1e28f858342b2c83a92ffdcc735035511b68b': 0, // Receiver's key.
	'40144db4eddf4c7ebef6629de3442f66bab5899e5f6bd308cd30919f16ae4963': 1, // Buzzer #1's key.
	'9c339dbba7919d475985543e53b136e6d54a2ee3d1af5f0748566b060144dd69': 2, // Buzzer #2's key...
	'7d43b0053a9da7b83b321cd461646c3dec646cb3fa45374f86cbebfb2ea43736': 3,
	'ac1ead30257f32bf02ea5dff55597b6c525d8626d2799c6b2b9650387bb914da': 4
	};
	var receiver = null;
	var senders = {1: null, 2: null, 3: null, 4: null}; // You can add more/remove buzzers if you want to.

	const lockClients = true; // If it is true, a connected client will not be overriden by another client logging in until it disconnects.
	if (lockClients) canConnect = function(id) {
	if (id == 0) return receiver === null;
	return senders[id] === null;
	}
	else canConnect = function(id) {
	return true;
	}

	function processBuzzer(client) {
	if (receiver == null) return;
	receiver.send('BUZZER '+client.buzzerId);
	//console.log('Buzzer #'+client.buzzerId+' is activated.');
	}

	function onDisconnect(id) {
	if (id === 0) {
	receiver = null;
	console.log('Receiver has disconnected.');
	} else {
	senders[id] = null;
	console.log('Sender #' + id + ' has disconnected.');
	}
	}

	server.on('connection', function(client) {
	client.sendBuzzer = function() {};
	client.on('message', function(message) {
	if (message.startsWith('PASSWORD: ')) {
	let id = passes[message.substring(10).hashCode()];
	if (id !== undefined && canConnect(id)) {
	if (client.buzzerId !== undefined) onDisconnect(client.buzzerId);
	client.buzzerId = id;
	if (id === 0) {
	receiver = client;
	console.log('Receiver has connected.');
	} else {
	senders[id] = client;
	console.log('Sender #' + id + ' has connected.');
	client.sendBuzzer = function() { processBuzzer(this) };
	client.send('CONNECTED SUCCESSFULLY');
	}
	}
	}
	if (message == 'BUZZER') client.sendBuzzer();
	});
	client.on('close', function() {
	if (client.buzzerId !== undefined) onDisconnect(client.buzzerId);
	});
	});

	console.log('Server is running.');
	Const slideNumber As Integer = 1 ' The slide number in your presentation.
	Dim shouldAcceptBuzzers As Boolean
	Dim theSlide As Slide
	Sub BuzzersResetAll()
	Set theSlide = ActivePresentation.Slides(1)
	Dim i As Integer
	For i = 1 To 4
	theSlide.Shapes("Team " + CStr(i) + " buzzer").Fill.ForeColor.RGB = 16777215
	Next i
	shouldAcceptBuzzers = True
	End Sub
	Function onBuzzerActivated(ByVal team As Integer)
	If Not shouldAcceptBuzzers Then
	onBuzzerActivated = False
	Exit Function
	End If
	theSlide.Shapes("Team " + CStr(team) + " buzzer").Fill.ForeColor.RGB = 9306037
	shouldAcceptBuzzers = False
	onBuzzerActivated = True
	End Function