Stop Canvas from logging events such as the user leaving the page to cheat
// ==UserScript==
// @name Canvas Quiz Untracker
// @namespace 7549a111-af08-40ea-a952-539c6d8e2021
// @version 1.0.0
// @description Stop Canvas from logging events such as the user leaving the page to cheat
// @author PrimePlaya24
// @license MIT
// @include /^https:\/\/canvas\.[a-z0-9]*?\.[a-z]*?\/?(.*)?/
// @include /^https:\/\/[a-z0-9]*?\.instructure\.com\/?(.*)?/
// @icon https://canvas.instructure.com/favicon.ico
// @grant none
// @run-at document-start
// ==/UserScript==
/*
Example:
{"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\":[]}"}
options - object
data - stringified object
quiz_submission_events - array
*/
const log = (str, ...data) => {
if (isEmptyArray(data)) {
console.log(`[CQU] - ${str}`);
} else {
console.log(`[CQU] - ${str}:`, data);
}
};
const get = (selector) =>
selector
.replace(/\[([^\[\]]*)\]/g, ".$1.")
.split(".")
.filter((t) => t !== "")
.reduce((prev, cur) => prev && prev[cur], window);
const isEmptyObject = (obj) => JSON.stringify(obj) === "{}";
const isEmptyArray = (arr) => !arr.length;
const waitUntil = (fn) => {
return new Promise(async (resolve, reject) => {
if (typeof fn !== "function") {
reject();
}
while (Boolean(fn()) !== true) {
await new Promise((r) => setTimeout(r, 10));
}
resolve(true);
});
};
const main = () => {
waitUntil(() => get("jQuery") !== undefined).then(() => {
const ajaxOriginal = window.jQuery.ajax;
window.jQuery.ajax = function () {
const ID = (Math.random() * 1e18).toString(36).substring(0, 6);
const ajaxOptions = arguments?.[0];
// log(`[${ID}] ajaxOptions`, ajaxOptions);
if (
ajaxOptions?.url?.search?.("events") > -1 ||
ajaxOptions?.url?.search?.("page_views") > -1
) {
const moddedData =
typeof ajaxOptions?.data === "string" &&
JSON.parse(ajaxOptions?.data ?? "{}");
if (!isEmptyObject(moddedData)) {
const unfiltered = moddedData.quiz_submission_events;
moddedData.quiz_submission_events =
moddedData?.quiz_submission_events?.filter?.(
(e) => e.event_type.search("page") == -1
);
if (isEmptyArray(moddedData.quiz_submission_events)) {
log(
`[${ID}] Skipped sending an empty log, not sending!`,
moddedData
);
return Promise.resolve();
}
log(
`[${ID}] Cleaned AJAX request, [before, after]`,
unfiltered,
moddedData.quiz_submission_events
);
ajaxOptions.data = JSON.stringify(moddedData);
return ajaxOriginal.apply(this, arguments);
}
log(`[${ID}] Not sending this AJAX request!`, ajaxOptions);
return Promise.resolve();
}
log(`[${ID}] Sending unmodified`, ajaxOptions);
return ajaxOriginal.apply(this, arguments);
};
});
};
if (["complete", "interactive"].indexOf(document.readyState) > -1) {
main();
} else {
document.addEventListener("DOMContentLoaded", main, false);
}