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Canvas Quiz Untracker

Stop Canvas from logging events such as the user leaving the page to cheat

  1. // ==UserScript==
  2. // @name         Canvas Quiz Untracker
  3. // @namespace    7549a111-af08-40ea-a952-539c6d8e2021
  4. // @version      1.0.0
  5. // @description  Stop Canvas from logging events such as the user leaving the page to cheat
  6. // @author       PrimePlaya24
  7. // @license      MIT
  8. // @include      /^https:\/\/canvas\.[a-z0-9]*?\.[a-z]*?\/?(.*)?/
  9. // @include      /^https:\/\/[a-z0-9]*?\.instructure\.com\/?(.*)?/
  10. // @icon         https://canvas.instructure.com/favicon.ico
  11. // @grant        none
  12. // @run-at       document-start
  13. // ==/UserScript==
  14.  
  15. /*
  16.  
  17. Example:
  18.  
  19. {"url":"/api/v1/courses/261055/quizzes/300404/submissions/11199445/events","type":"POST","global":false,"headers":{"Accept":"application/json; charset=UTF-8","Content-Type":"application/json; charset=UTF-8"},"data":"{\"quiz_submission_events\":[]}"}
  20.  
  21. options - object
  22.     data - stringified object
  23.         quiz_submission_events - array
  24. */
  25.  
  26. const log = (str, ...data) => {
  27.   if (isEmptyArray(data)) {
  28.     console.log(`[CQU] - ${str}`);
  29.   } else {
  30.     console.log(`[CQU] - ${str}:`, data);
  31.   }
  32. };
  33.  
  34. const get = (selector) =>
  35.   selector
  36.     .replace(/\[([^\[\]]*)\]/g, ".$1.")
  37.     .split(".")
  38.     .filter((t) => t !== "")
  39.     .reduce((prev, cur) => prev && prev[cur], window);
  40.  
  41. const isEmptyObject = (obj) => JSON.stringify(obj) === "{}";
  42.  
  43. const isEmptyArray = (arr) => !arr.length;
  44.  
  45. const waitUntil = (fn) => {
  46.   return new Promise(async (resolve, reject) => {
  47.     if (typeof fn !== "function") {
  48.       reject();
  49.     }
  50.     while (Boolean(fn()) !== true) {
  51.       await new Promise((r) => setTimeout(r, 10));
  52.     }
  53.     resolve(true);
  54.   });
  55. };
  56.  
  57. const main = () => {
  58.   waitUntil(() => get("jQuery") !== undefined).then(() => {
  59.     const ajaxOriginal = window.jQuery.ajax;
  60.     window.jQuery.ajax = function () {
  61.       const ID = (Math.random() * 1e18).toString(36).substring(0, 6);
  62.       const ajaxOptions = arguments?.[0];
  63.       //   log(`[${ID}] ajaxOptions`, ajaxOptions);
  64.       if (
  65.         ajaxOptions?.url?.search?.("events") > -1 ||
  66.         ajaxOptions?.url?.search?.("page_views") > -1
  67.       ) {
  68.         const moddedData =
  69.           typeof ajaxOptions?.data === "string" &&
  70.           JSON.parse(ajaxOptions?.data ?? "{}");
  71.         if (!isEmptyObject(moddedData)) {
  72.           const unfiltered = moddedData.quiz_submission_events;
  73.           moddedData.quiz_submission_events =
  74.             moddedData?.quiz_submission_events?.filter?.(
  75.               (e) => e.event_type.search("page") == -1
  76.             );
  77.           if (isEmptyArray(moddedData.quiz_submission_events)) {
  78.             log(
  79.               `[${ID}] Skipped sending an empty log, not sending!`,
  80.               moddedData
  81.             );
  82.             return Promise.resolve();
  83.           }
  84.           log(
  85.             `[${ID}] Cleaned AJAX request, [before, after]`,
  86.             unfiltered,
  87.             moddedData.quiz_submission_events
  88.           );
  89.           ajaxOptions.data = JSON.stringify(moddedData);
  90.           return ajaxOriginal.apply(this, arguments);
  91.         }
  92.         log(`[${ID}] Not sending this AJAX request!`, ajaxOptions);
  93.         return Promise.resolve();
  94.       }
  95.       log(`[${ID}] Sending unmodified`, ajaxOptions);
  96.       return ajaxOriginal.apply(this, arguments);
  97.     };
  98.   });
  99. };
  100.  
  101. if (["complete", "interactive"].indexOf(document.readyState) > -1) {
  102.   main();
  103. } else {
  104.   document.addEventListener("DOMContentLoaded", main, false);
  105. }