Userscript

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adithyagenie 2023-08-18 21:04:25 +05:30
parent 4830d8f761
commit 4b75f89c0a
2 changed files with 88 additions and 1 deletions

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# skillrack-captcha-solver # skillrack-captcha-solver
Captcha solver for skillrack Captcha solver for skillrack.
Use GreaseMonkey/TamperMonkey to run the script.

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userscript.js Normal file
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// ==UserScript==
// @name Math Problem Solver
// @namespace https://github.com/adithyagenie/skillrack-captcha-solver
// @version 0.1
// @description Solves math captcha in SkillRack using Tesseract.js
// @author adithyagenie
// @include https://*.skillrack.com/*
// @require https://cdn.jsdelivr.net/npm/tesseract.js@4.1.1/dist/tesseract.min.js
// ==/UserScript==
(function () {
// Wait for window to load
window.addEventListener("load", function () {
console.log("Checking for captchas");
// Step 1: Get the Image
const image = document.getElementById("j_id_6s");
const textbox = document.getElementById("capval");
const button = document.getElementById("proceedbtn");
if (image == null) {
console.log("Captcha not found!");
return;
}
// Invert colours for better ocr
function invertImageColors(image) {
const canvas = document.createElement("canvas");
canvas.width = image.width;
canvas.height = image.height;
const ctx = canvas.getContext("2d");
ctx.drawImage(image, 0, 0, image.width, image.height);
const imageData = ctx.getImageData(0, 0, image.width, image.height);
const data = imageData.data;
for (let i = 0; i < data.length; i += 4) {
data[i] = 255 - data[i]; // Red
data[i + 1] = 255 - data[i + 1]; // Green
data[i + 2] = 255 - data[i + 2]; // Blue
}
ctx.putImageData(imageData, 0, 0);
image.src = canvas.toDataURL();
}
function getNums(text) {
const a = text
.trim()
.split(" ")
.join("")
.replace("=", "")
.split("+");
return [a[0], a[1]];
}
invertImageColors(image);
// Step 2: Image Processing with Tesseract.js
Tesseract.recognize(image.src, "eng", { whitelist: "1234567890+=" })
.then(({ data: { text } }) => {
// Step 3: Extract the Math Problem
const mathProblem = getNums(text);
// Step 4: Solve the Math
if (mathProblem) {
const result =
parseInt(mathProblem[0]) + parseInt(mathProblem[1]);
console.log(
"Found math captcha:",
mathProblem,
"=",
result,
"Auto-filling answer"
);
textbox.value = result;
button.click();
} else {
console.log("No math problem found in the image text.");
}
return;
})
.catch((error) => {
console.error("Error processing captcha:", error);
});
});
})();