Added code from Replit

index.js

@@ -0,0 +1,235 @@
+const WebSocket = require('ws')
+const fs = require('fs');
+let trackIndex = 0
+let trackArray
+
+let timerDefault = 600
+let warningTimerDefault = 20
+
+let timer = timerDefault
+let warningTimer = warningTimerDefault
+
+const wss = new WebSocket.Server({ port: 8080 })
+let ws
+let players = []
+let currentID = 1
+
+fs.readdir('./tracks/', (err, files) => {
+  trackArray = files
+  shuffle(trackArray);
+});
+
+wss.on('connection', (socket, req) => {
+  ws = socket
+  ws.binaryType = 'arraybuffer'
+  ws.on('message', function message(data, isBinary) {
+    if (isBinary == true) {
+      // Nothing to see here...
+    } else {
+      const message = isBinary ? data : data.toString();
+      var responseJSON = JSON.parse(message)
+      // if (responseJSON.hasOwnProperty('username')) {
+      if (Object.keys(responseJSON)[0] == 'username') {
+        responseJSON.username = responseJSON.username.replaceAll('"', '')
+        responseJSON.username = responseJSON.username.replaceAll('{', '')
+        responseJSON.username = responseJSON.username.replaceAll('}', '')
+        responseJSON.username = responseJSON.username.replaceAll('`', '')
+        responseJSON.username = responseJSON.username.replaceAll(`'`, '')
+        if (responseJSON.username.length > 32 || responseJSON.username.length < 1) {
+          ws.close()
+          return
+        }
+        ws.send(`{ "ID" : "${currentID}"}`)
+        players.push({username : responseJSON.username, time : 999999, IP : req.socket.remoteAddress, ID : currentID})
+        currentID = currentID + 1
+        sendTrack(ws)
+        updateLeaderboard()
+        console.log(`User ${responseJSON.username} has connected`)
+      }
+      if (Object.keys(responseJSON)[0] == 'replay') {
+        if (warningInterval) return
+        /* var buffer = Buffer.from(responseJSON.replay, 'base64'); // Ta-da
+        var view = new Uint8Array(buffer)
+        var dec1 = view[25]
+        var dec2 = view[24]
+        var timeWord = `${("00000000"+dec1.toString(2)).slice(-8)}${("00000000"+dec2.toString(2)).slice(-8)}`
+        var time = parseInt(timeWord, 2);
+        var matches = players.filter(obj => {
+          return obj.username === responseJSON.username
+        })
+        matches.forEach(function (currentValue, index, arr){
+          if (currentValue.IP == req.socket.remoteAddress) {
+            if (currentValue.ID == responseJSON.ID) {
+              if (currentValue.time > time) {
+                currentValue.time = time
+              }
+            }
+          }
+        }) */
+        var buffer = Buffer.from(responseJSON.replay, 'base64'); // Ta-da
+        var view = new Uint8Array(buffer)
+        var dec1 = view[51]
+        var dec2 = view[50]
+        let timeHundredths = dec1 * 1280 + dec2 * 5
+        let time = timeHundredths * 10
+        var matches = players.filter(obj => {
+          return obj.username === responseJSON.username
+        })
+        matches.forEach(function (currentValue, index, arr){
+          if (currentValue.IP == req.socket.remoteAddress) {
+            if (currentValue.ID == responseJSON.ID) {
+              if (currentValue.time > time) {
+                currentValue.time = time
+                console.log(`User ${responseJSON.username}'s new best time is ${time}`)
+              }
+            }
+          }
+        })
+        updateLeaderboard()
+      }
+      if (Object.keys(responseJSON)[0] == 'disconnect') {
+        var matches = players.filter(obj => {
+          return obj.username === responseJSON.username
+        })
+        matches.forEach(function (currentValue, index, arr){
+          if (currentValue.IP == req.socket.remoteAddress) {
+            if (currentValue.ID == responseJSON.ID) {
+              players.splice(players.indexOf(currentValue), 1)
+              console.log(`User ${responseJSON.username} has disconnected`)
+            }
+          }
+        })
+        updateLeaderboard()
+      }
+    }
+    // Continue as before.
+  });
+
+  ws.on('close', function() {
+    // Code here
+  })
+})
+
+wss.broadcast = function(broadcastMessage) {
+  wss.clients.forEach(client => client.send(broadcastMessage));
+};
+
+function str2ab(str) {
+    var buf = new ArrayBuffer(str.length*2); // 2 bytes for each char
+    var bufView = new Uint16Array(buf);
+    for (var i=0, strLen=str.length; i < strLen; i++) {
+    bufView[i] = str.charCodeAt(i);
+    }
+    return buf;
+}
+
+function updateLeaderboard() {
+  players.sort(function (a, b) {
+    return a.time - b.time;
+  });
+  var playersForClient = players.map(({ IP, ...item }) => item);
+  wss.broadcast(`{"leaderboard" : ${JSON.stringify(playersForClient)}}`)
+}
+
+function dec2bin(dec) {
+  return (dec >>> 0).toString(2);
+}
+
+function _base64ToArrayBuffer(base64) {
+    var binary_string = window.atob(base64);
+    var len = binary_string.length;
+    var bytes = new Uint8Array(len);
+    for (var i = 0; i < len; i++) {
+        bytes[i] = binary_string.charCodeAt(i);
+    }
+    return bytes.buffer;
+}
+
+function shuffle(array) {
+  let currentIndex = array.length,  randomIndex;
+
+  // While there remain elements to shuffle.
+  while (currentIndex != 0) {
+
+    // Pick a remaining element.
+    randomIndex = Math.floor(Math.random() * currentIndex);
+    currentIndex--;
+
+    // And swap it with the current element.
+    [array[currentIndex], array[randomIndex]] = [
+      array[randomIndex], array[currentIndex]];
+  }
+
+  return array;
+}
+
+// Sends current track as Uint8Array ArrayBuffer to client
+function sendTrack() {
+  let trackBase64 = fs.readFileSync(`./tracks/${trackArray[trackIndex]}`, null).toString('base64');
+  ws.send(`{ "track" : "${trackBase64}", "name" : "${trackArray[trackIndex]}" }`)
+  console.log(`Sent track "${trackArray[trackIndex]}"`)
+}
+
+function broadcastTrack() {
+  let trackBase64 = fs.readFileSync(`./tracks/${trackArray[trackIndex]}`, null).toString('base64');
+  wss.broadcast(`{ "track" : "${trackBase64}", "name" : "${trackArray[trackIndex]}" }`)
+  console.log(`Broadcasted track "${trackArray[trackIndex]}"`)
+}
+
+function sendWarning() {
+  wss.broadcast(`{ "warning" : "when the imposter is sus!" }`)
+}
+
+/* function intervalFunction() {
+  wss.clients.forEach(client => client.send(`{ "timer" : ${timer} }`));
+  timer--
+  if (timer === 0) {
+    trackIndex++
+    if (typeof trackArray[trackIndex] == 'undefined') {
+      trackIndex = 0
+    }
+    sendTrack()
+    players.forEach(function (element, index) {
+      element.time = 999999
+    })
+    updateLeaderboard()
+    timer = 420
+  }
+} */
+
+function intervalFunction() {
+  if (timer < 0) {
+    if (warningTimer < 0) {
+      clearInterval(warningInterval)
+      warningInterval = null
+      warningTimer = warningTimerDefault
+      trackIndex++
+      if (typeof trackArray[trackIndex] == 'undefined') {
+        trackIndex = 0
+      }
+      broadcastTrack()
+      players.forEach(function (element, index) {
+        element.time = 999999
+      })
+      updateLeaderboard()
+      timer = timerDefault
+    } else {
+      if (!warningInterval) {
+        sendWarning()
+        warningInterval = setInterval(warningIntervalFunction, 1000)
+      }
+    }
+  }
+  if (!warningInterval) {
+    wss.clients.forEach(client => client.send(`{ "timer" : ${timer} }`));
+    timer--
+  }
+}
+
+function warningIntervalFunction() {
+  wss.clients.forEach(client => client.send(`{ "timer" : ${warningTimer} }`));
+  warningTimer--
+}
+
+let interval = setInterval(intervalFunction, 1000)
+let warningInterval