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gimkit-lightning.js
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gimkit-lightning.js
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//
// name: ⚡️ Gimkit Lightning
// author: Nate Levin (https://natelev.in)
// desc: Auto-answer questions on Gimkit
//
let answers = null;
let room = null;
let is2DGame = false;
const decoder = new TextDecoder("utf-8");
const onWsMessage = function (event) {
const { data } = event;
const strData = decoder.decode(data);
const readableStrData = JSON.stringify(strData, null, 2);
// Gimkit uses a binary format, but we can just parse it as if it is text
// With a bit of reverse engineering, you can find that it will send out the questions including their answers!
// console.log("🚨 Received msg: ", { data }, readableStrData);
if (strData.includes("STATE_UPDATE�data��type�GAME_QUESTIONS")) {
console.log("🚨📣 Received STATE_UPDATE: ", { data }, readableStrData);
if (!room) {
const [_roomMatch, matchedRoom] =
strData.match(/�message-([^�]+)�/);
room = matchedRoom;
}
const questions = strData.split("position").slice(1);
answers = [];
for (const questionData of questions) {
const [_idMatch, id] = questionData.match(/_id�([^�]+)�/);
const correctAnswers = Array.from(
questionData.matchAll(/correctã_id�([^�]+)�text�([^�]+)�/g)
).map(([_match, id, text]) => ({
id,
text,
}));
answers.push({ id, correctAnswers });
}
} else if (strData.includes("DEVICES_STATES_CHANGES")) {
// this is sent for all the 2d
is2DGame = true;
const jsonStartIndex = strData.indexOf('[{"type":"mc","position":0,');
if (jsonStartIndex === -1) return;
let strDataSliced = strData.slice(jsonStartIndex);
const jsonEndIndex = strDataSliced.indexOf('__v":0}]');
strDataSliced = strDataSliced.slice(0, jsonEndIndex + 8);
console.log("🚨📣 Received DEVICES_STATES_CHANGES: ", strDataSliced);
const questions = JSON.parse(strDataSliced);
answers = new Map();
for (const question of questions) {
const id = question["_id"];
const correctAnswers = question.answers
.filter((ans) => !!ans.correct)
.map((ans) => ({ id: ans["_id"], text: ans.text }));
console.log(question);
answers.set(question["text"], { id, correctAnswers });
}
}
};
let clapping = false;
const clickRepeatedly = (el) => {
el.click();
requestAnimationFrame(() => clickRepeatedly(el));
};
const game2DInterval = () => {
if (
!is2DGame ||
!answers ||
answers.size === 0 ||
window.__gimkitLightningWebsocket.readyState > 1 ||
clapping
)
return;
const continueBtn = document.evaluate(
"//div[text()='Continue']",
document,
null,
XPathResult.FIRST_ORDERED_NODE_TYPE,
null
).singleNodeValue;
if (continueBtn) {
continueBtn.click();
continueBtn.parentElement.style.color = "yellow";
continueBtn.parentElement.parentElement.parentElement.style.transform =
"scale(99)";
return;
}
// keep fishing in the fish game
const fishAgain = document.evaluate(
"//span[text()='Fish Again']",
document,
null,
XPathResult.FIRST_ORDERED_NODE_TYPE,
null
).singleNodeValue;
if (fishAgain) {
const backpackFull = document.evaluate(
"//div[contains(text(),'However, your backpack cannot carry more of this fish.')]",
document,
null,
XPathResult.FIRST_ORDERED_NODE_TYPE,
null
).singleNodeValue;
if (!backpackFull) {
fishAgain.click();
}
}
const els = Array.from(document.querySelectorAll(".notranslate.lang-en"));
if (els.length === 0) return;
const question = els[0].textContent;
const correctAns = answers.get(question);
if (!correctAns) {
console.warn("Encountered a question that we don't know: " + question);
return;
}
for (const ans of correctAns.correctAnswers) {
for (const el of els) {
if (el.textContent === ans.text) {
el.click();
el.parentElement.style.color = "yellow";
el.parentElement.parentElement.parentElement.parentElement.parentElement.style.transform =
"scale(99)";
}
}
}
};
setInterval(game2DInterval, 50);
const clapChecker = () => {
const clapButton = document.querySelector("div.animated.pulse.infinite");
if (clapButton && clapButton.textContent.startsWith("👏")) {
// game over!
console.log("Game over!");
clickRepeatedly(clapButton);
clapping = true;
}
};
setInterval(clapChecker, 250);
let answerIndex = 0;
const regularGameInterval = () => {
if (
is2DGame ||
!answers ||
answers.length === 0 ||
window.__gimkitLightningWebsocket.readyState > 1 ||
clapping
)
return;
const { id, correctAnswers } = answers[answerIndex];
try {
// TODO: handle multiple correct answers
window.__gimkitLightningWebsocket.send(
Uint8Array.from(
`\u0004\u0084\u00A4type\u0002\u00A4data\u0092\u00B5blueboat_SEND_MESSAGE\u0083\u00A4room\u00AE${room}\u00A3key\u00B1QUESTION_ANSWERED\u00A4data\u0082\u00AAquestionId\u00B8${id}\u00A6answer\u00B8${correctAnswers[0].id}\u00A7options\u0081\u00A8compress\u00C3\u00A3nsp\u00A1/`,
(ch) => ch.charCodeAt(0)
)
);
} catch (err) {
console.error("Error sending correct answer: " + err);
}
answerIndex = (answerIndex + 1) % answers.length;
};
setInterval(regularGameInterval, 750);
// inject into WebSocket.send to track the game
let oldSend = WebSocket.prototype.send;
WebSocket.prototype.send = function (data) {
// if we haven't gotten the answers after 5s, we should try to force a reconnection
// so that Gimkit will send us the answers!
setTimeout(() => {
if (!answers) {
console.log("❌ Closing websocket for reconnection");
this.close();
}
}, 5_000);
const strData = JSON.stringify(decoder.decode(data), null, 2);
if (is2DGame) {
const deviceIdMatch = strData.match(/deviceId�([^�]+)�/);
if (deviceIdMatch) room = deviceIdMatch[1];
}
// console.log("📧 Sent msg: ", { data }, strData);
this.addEventListener("message", onWsMessage.bind(this));
window.__gimkitLightningWebsocket = this;
return oldSend.call(this, data);
};