91 lines
2.4 KiB
JavaScript
91 lines
2.4 KiB
JavaScript
//
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// Copyright © 2023 adithyagenie
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//
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// ==UserScript==
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// @name Math Problem Solver
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// @namespace https://github.com/adithyagenie/skillrack-captcha-solver
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// @version 0.1
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// @description Solves math captcha in SkillRack using Tesseract.js
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// @author adithyagenie
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// @include https://*.skillrack.com/*
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// @require https://cdn.jsdelivr.net/npm/tesseract.js@4.1.1/dist/tesseract.min.js
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// ==/UserScript==
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(function () {
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// Wait for window to load
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window.addEventListener("load", function () {
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console.log("Checking for captchas");
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// Step 1: Get the Image
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const image = document.getElementById("j_id_6s");
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const textbox = document.getElementById("capval");
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const button = document.getElementById("proceedbtn");
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if (image == null) {
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console.log("Captcha not found!");
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return;
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}
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// Invert colours for better ocr
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function invertImageColors(image) {
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const canvas = document.createElement("canvas");
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canvas.width = image.width;
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canvas.height = image.height;
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const ctx = canvas.getContext("2d");
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ctx.drawImage(image, 0, 0, image.width, image.height);
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const imageData = ctx.getImageData(0, 0, image.width, image.height);
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const data = imageData.data;
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for (let i = 0; i < data.length; i += 4) {
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data[i] = 255 - data[i]; // Red
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data[i + 1] = 255 - data[i + 1]; // Green
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data[i + 2] = 255 - data[i + 2]; // Blue
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}
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ctx.putImageData(imageData, 0, 0);
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image.src = canvas.toDataURL();
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}
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function getNums(text) {
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const a = text
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.trim()
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.split(" ")
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.join("")
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.replace("=", "")
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.split("+");
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return [a[0], a[1]];
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}
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invertImageColors(image);
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// Step 2: Image Processing with Tesseract.js
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Tesseract.recognize(image.src, "eng", { whitelist: "1234567890+=" })
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.then(({ data: { text } }) => {
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// Step 3: Extract the Math Problem
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const mathProblem = getNums(text);
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// Step 4: Solve the Math
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if (mathProblem) {
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const result =
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parseInt(mathProblem[0]) + parseInt(mathProblem[1]);
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console.log(
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"Found math captcha:",
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mathProblem,
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"=",
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result,
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"Auto-filling answer"
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);
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textbox.value = result;
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button.click();
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} else {
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console.log("No math problem found in the image text.");
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}
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return;
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})
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.catch((error) => {
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console.error("Error processing captcha:", error);
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});
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});
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})();
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