☰

Kahoot AntiBot

Remove all bots from a kahoot game.

当前为 2019-04-09 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Kahoot AntiBot
  3. // @namespace    http://tampermonkey.net/
  4. // @version      2.1.2
  5. // @description  Remove all bots from a kahoot game.
  6. // @author       theusaf
  7. // @match        *://play.kahoot.it/*
  8. // @grant        none
  9. // @run-at       document_start
  10. // ==/UserScript==
  11.  
  12. window.stop(); //stop loading and save data from the page.
  13. window.url = window.location.href;
  14. window.kahootScript = null;
  15. window.kahootScriptSrc = "https://play.kahoot.it/js/player.min.js?v=" + window.kahoot.version;
  16. document.documentElement.innerHTML = "";
  17. window.x = new XMLHttpRequest();
  18. window.x.open("GET",kahootScriptSrc);
  19. window.x.send();
  20. window.x.onload = ()=>{ //load kahoot resources and edit code to allow access to the websockets
  21.     var fix = window.x.response.replace("i.onMessage=function(e,t){","i.onMessage=function(e,t){window.globalMessageListener(e,t);"); //edit code to be able to read all messages and access the websocket
  22.     //console.log(fix);
  23.     window.kahootScript = document.createElement("script");
  24.     window.kahootScript.innerHTML = fix;
  25.     var x = new XMLHttpRequest();
  26.     x.open("GET","https://play.kahoot.it/js/bootstrap.js");
  27.     x.send();
  28.     x.onload = ()=>{
  29.         var patch = x.response.replace(",$script([\"js/player.min.js?v\"+kahoot.version],function(){angular.bootstrap(document,[\"app\"])});","");
  30.         var pS = document.createElement("script");
  31.         pS.innerHTML = patch;
  32.         var x2 = new XMLHttpRequest();
  33.         x2.open("GET",url);
  34.         x2.send();
  35.         x2.onload = ()=>{
  36.             var fin = x2.response.replace("js/bootstrap.js","data:text/plain,null");
  37.             document.open();
  38.             document.write(fin);
  39.             document.close();
  40.             window.onload = ()=>{
  41.                 document.body.append(pS);
  42.                 document.body.append(window.kahootScript);
  43.                 angular.bootstrap(document,["app"]); /*global angular*/
  44.                 setupAntibot(); //win!
  45.             };
  46.         };
  47.     };
  48. };
  49.  
  50. function setupAntibot(){
  51.     const percent = 0.6;
  52.     var waterMark = document.createElement("p");
  53.     waterMark.innerText = "v2.1.2 @theusaf";
  54.     waterMark.style = "position: fixed; bottom: 100px; right: 100px; font-size: 1em";
  55.     document.body.append(waterMark);
  56.     window.isUsingNamerator = false;
  57.     window.cachedUsernames = [];
  58.     window.confirmedPlayers = [];
  59.     var messageId = 0;
  60.     var clientId = null;
  61.     var pin = null;
  62.     function similarity(s1, s2) {
  63.         if(!s2){
  64.             return 0;
  65.         }
  66.         if(!isNaN(s2) && !isNaN(s1) && s1.length == s2.length){
  67.             return 1;
  68.         }
  69.         if(window.isUsingNamerator){
  70.             let caps = s2.length - s2.replace(/[A-Z]/g, '').length;
  71.             if(caps !== 2){ //has less than 2 or more than 2 capitals
  72.                 return 1;
  73.             }
  74.             if (s2.substr(0,1).replace(/[A-Z]/g,'').length == 1){ //first char is not a capital
  75.                 return 1;
  76.             }
  77.             if(s2.substr(s2.length - 1,1).replace(/[A-Z]/g,'').length == 0){ //last char is a capital
  78.                 return 1;
  79.             }
  80.             if(s2.replace(/[a-z]/ig,'').length > 0){ //has non-letter chars
  81.                 return 1;
  82.             }
  83.         }
  84.         if(!s1){
  85.             return;
  86.         }
  87.         s1 = s1.toLowerCase();
  88.         s2 = s2.toLowerCase();
  89.         var longer = s1;
  90.         var shorter = s2;
  91.         if (s1.length < s2.length) {
  92.             longer = s2;
  93.             shorter = s1;
  94.         }
  95.         var longerLength = longer.length;
  96.         if (longerLength == 0) {
  97.             return 1.0;
  98.         }
  99.         return (longerLength - editDistance(longer, shorter)) / parseFloat(longerLength);
  100.     }
  101.     function editDistance(s1, s2) {
  102.         s1 = s1.toLowerCase();
  103.         s2 = s2.toLowerCase();
  104.  
  105.         var costs = new Array();
  106.         for (var i = 0; i <= s1.length; i++) {
  107.             var lastValue = i;
  108.             for (var j = 0; j <= s2.length; j++) {
  109.                 if (i == 0){
  110.                     costs[j] = j;
  111.                 }
  112.                 else {
  113.                     if (j > 0) {
  114.                         var newValue = costs[j - 1];
  115.                         if (s1.charAt(i - 1) != s2.charAt(j - 1)){
  116.                             newValue = Math.min(Math.min(newValue, lastValue),costs[j]) + 1;
  117.                         }
  118.             costs[j - 1] = lastValue;
  119.                         lastValue = newValue;
  120.                     }
  121.                 }
  122.             }
  123.             if (i > 0){
  124.                 costs[s2.length] = lastValue;
  125.             }
  126.         }
  127.         return costs[s2.length];
  128.     }
  129.     function checkSettings(){
  130.         var namer = document.querySelectorAll("[data-functional-selector=\"game-settings-namerator-toggle\"]")[0];
  131.         window.isUsingNamerator = Array.from(namer.classList).includes("on");
  132.         let observer = new MutationObserver(function(button){
  133.             window.isUsingNamerator = Array.from(button[0].target.classList).includes("on");
  134.         });
  135.         let conf = {
  136.             attributes: true
  137.         };
  138.         observer.observe(namer,conf);
  139.     }
  140.     function setup(){
  141.         var launch_button = document.querySelectorAll("[data-functional-selector=\"launch-button\"]")[0];
  142.         if(launch_button){
  143.             console.warn("launch button found!");
  144.             checkSettings();
  145.         }else{
  146.             setTimeout(setup,1000);
  147.         }
  148.     }
  149.     setup();
  150.     function createKickPacket(id){
  151.         messageId++;
  152.         return [{
  153.             channel: "/service/player",
  154.             clientId: clientId,
  155.             id: String(Number(messageId)),
  156.             data: {
  157.                 cid: String(id),
  158.                 content: JSON.stringify({
  159.                     kickCode: 1,
  160.                     quizType: "quiz"
  161.                 }),
  162.                 gameid: pin,
  163.                 host: "play.kahoot.it",
  164.                 id: 10,
  165.                 type: "message"
  166.             }
  167.         }];
  168.     }
  169.     function determineEvil(player,socket){
  170.         if(window.cachedUsernames.length == 0){
  171.             if(similarity(null,player.name) >= percent){
  172.                 var packet = createKickPacket(player.cid);
  173.                 socket.send(JSON.stringify(packet));
  174.                 console.warn(`Bot ${player.name} has been banished`);
  175.                 throw "Bot banned. Dont add";
  176.             }
  177.             window.cachedUsernames.push({name: player.name, id: player.cid, time: 10, banned: false});
  178.         }else{
  179.             var removed = false;
  180.             for(var i in window.cachedUsernames){
  181.                 if(window.confirmedPlayers.includes(window.cachedUsernames[i].name)){
  182.                     continue;
  183.                 }
  184.                 if(similarity(window.cachedUsernames[i].name,player.name) >= percent){
  185.                     removed = true;
  186.                     var packet1 = createKickPacket(player.cid);
  187.                     socket.send(JSON.stringify(packet1));
  188.                     if(!window.cachedUsernames[i].banned){
  189.                         var packet2 = createKickPacket(window.cachedUsernames[i].id);
  190.                         window.cachedUsernames[i].banned = true;
  191.                         window.cachedUsernames[i].time = 10;
  192.                         socket.send(JSON.stringify(packet2));
  193.                     }
  194.                     console.warn(`Bots ${player.name} and ${window.cachedUsernames[i].name} have been banished`);
  195.                     throw "Bot banned. Dont add";
  196.                 }
  197.             }
  198.             if(!removed){
  199.                 window.cachedUsernames.push({name: player.name, id: player.cid, time: 10, banned: false});
  200.             }
  201.         }
  202.     }
  203.     var timer = setInterval(function(){
  204.         for(let i in window.cachedUsernames){
  205.             if(window.cachedUsernames[i].time <= 0 && !window.cachedUsernames[i].banned && !window.confirmedPlayers.includes(window.cachedUsernames[i].name)){
  206.                 window.confirmedPlayers.push(window.cachedUsernames[i].name);
  207.                 continue;
  208.             }
  209.             if(window.cachedUsernames[i].time <= -20){
  210.                 window.cachedUsernames.splice(i,1);
  211.                 continue;
  212.             }
  213.             window.cachedUsernames[i].time--;
  214.         }
  215.     },1000);
  216.     window.globalMessageListener = function(e,t){
  217.         //console.log(e); from testing: e is the websocket
  218.         var data = JSON.parse(t.data)[0];
  219.         //console.log(data);
  220.         messageId = data.id ? data.id : messageId;
  221.         //if the message is the first message, which contains important clientid data
  222.         if(data.id == 1){
  223.             clientId = data.clientId;
  224.         }
  225.         //if the message contains the pin
  226.         if(data.id == 3){
  227.             pin = Number(data.subscription.split("r/")[1]);
  228.         }
  229.         //if the message is a player join message
  230.         if(data.data ? data.data.type == "joined" : false){
  231.             console.warn("determining evil...");
  232.             determineEvil(data.data,e);
  233.         }
  234.     }
  235. }