201 lines
5.9 KiB
JavaScript
201 lines
5.9 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 Skillrack Captcha Solver
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// @namespace https://github.com/adithyagenie/skillrack-captcha-solver
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// @version 0.6
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// @description Solves math captcha in SkillRack using Tesseract.js
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// @author adithyagenie
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// @license AGPL-3.0-or-later
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// @include /https:\/\/(www\.)?skillrack\.com\/faces\/candidate\/(codeprogram|tutorprogram|codeprogramgroup)\.xhtml/
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// @require https://cdn.jsdelivr.net/npm/tesseract.js@5.0.5/dist/tesseract.min.js
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// ==/UserScript==
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const USERNAME = "";
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(function () {
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"use strict";
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// Clear all sessionstorage data if going back out of solve.
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if (
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window.location.href.match(
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/https:\/\/(www.)?skillrack\.com\/faces\/candidate\/codeprogramgroup\.xhtml/gi
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)
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) {
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if (sessionStorage.getItem("Solvebtnid"))
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sessionStorage.removeItem("Solvebtnid");
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if (sessionStorage.getItem("captchaFail"))
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sessionStorage.removeItem("captchaFail");
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}
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function onClick(event) {
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// Get solve button click
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if (
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event.target.tagName === "SPAN" &&
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event.target.parentNode.tagName === "BUTTON"
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) {
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if (event.target.textContent === "Solve") {
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// Store button id of problem solve button.
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sessionStorage.setItem(
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"Solvebtnid",
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event.target.parentNode.id
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);
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}
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}
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}
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document.addEventListener("click", onClick, false);
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// Wait for window to load
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window.addEventListener("load", function () {
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// Detect if last captcha attempt was a fail to re-nav back
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if (sessionStorage.getItem("captchaFail")) {
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console.log(
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"Detected captcha fail. Attempting to open last open page."
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);
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// Reset captcha state
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sessionStorage.removeItem("captchaFail");
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// Get old button id
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const old = sessionStorage.getItem("Solvebtnid");
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if (old) {
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const oldbutt = document.getElementById(old);
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if (oldbutt) oldbutt.click();
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}
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return;
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}
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console.log("Checking for captchas");
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// Get the captcha
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// Different image ids for tutorial and track websites
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let image;
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if (
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window.location.href.match(
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/https:\/\/(www.)?skillrack\.com\/faces\/candidate\/codeprogram\.xhtml/gi
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)
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)
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image = document.getElementById("j_id_6x");
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else if (
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window.location.href.match(
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/https:\/\/(www.)?skillrack\.com\/faces\/candidate\/tutorprogram\.xhtml/gi
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)
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)
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image = document.getElementById("j_id_5o");
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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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// Check if past captcha submission was a failure
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const errors = document.getElementsByClassName("ui-growl-item");
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if (errors.length > 0) {
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if (errors[0].textContent.includes("Incorrect Captcha")) {
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if (
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window.location.href.match(
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/https:\/\/(www.)?skillrack\.com\/faces\/candidate\/tutorprogram\.xhtml/gi
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)
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) {
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alert("Unable to solve captcha :(");
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return;
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}
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sessionStorage.setItem("captchaFail", "true");
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console.log("Detected failed attempt at solving captcha");
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const back = document.getElementById("j_id_5s");
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back.click();
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return;
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}
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}
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// Get time for logging
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const time = new Date().getTime();
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// Clear captcha state
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if (sessionStorage.getItem("captchaFail")) {
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sessionStorage.removeItem("captchaFail");
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}
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// Invert colours for better ocr
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function invertColors(image) {
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const canvas = document.createElement("canvas");
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const ctx = canvas.getContext("2d");
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canvas.width = image.width;
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canvas.height = image.height;
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ctx.drawImage(image, 0, 0);
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ctx.globalCompositeOperation = "difference";
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ctx.fillStyle = "white";
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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return canvas.toDataURL();
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}
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// Remove username from captcha
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/**
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*
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* @param {string} text
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* @returns
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*/
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function removeText(text) {
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text = text.replace(USERNAME, "");
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let i = text.length - 1;
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i = text.lastIndexOf("+");
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if (i == -1) {
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alert("Oops! I wasn't able to parse the captcha correctly :( Please enter the captcha or try re-visitng again!");
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console.error("Error parsing username.");
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return;
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}
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i--;
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for (i; i >= 0; i--) {
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if (!("1234567890".includes(text[i]))) {
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return text.slice(i + 1);
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}
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}
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console.error("Error parsing username.");
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return;
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}
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// Parse OCR result and solve the problem
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function getNums(text) {
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const a = text.replace(" ", "").replace("=", "").split("+");
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return parseInt(a[0]) + parseInt(a[1]);
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}
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const invertedimg = invertColors(image);
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console.log(`Converting image: ${new Date().getTime() - time} ms.`);
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// Image Processing with Tesseract.js
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Tesseract.recognize(invertedimg, "eng", {
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whitelist: "1234567890+=abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@ ",
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psm: 6,
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})
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.then(({ data: { text } }) => {
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console.log(`OCR: ${new Date().getTime() - time} ms. Result: ${text}`);
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// Solve the Math Problem
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try {
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const mathprob = removeText(text);
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const result = getNums(mathprob);
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if (isNaN(result)) {
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alert(`Unable to solve math captcha... Check the readme file on https://github.com/adithyagenie/skillrack-captcha-solver for instructions on optional username parsing.\n\nSTRING RECOGNISED: ${text}`)
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return;
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}
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console.log(
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"Found math captcha. Auto-filling answer: ",
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result
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);
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textbox.value = result;
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// Click the submit button
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button.click();
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console.log(`Took ${new Date().getTime() - time} ms.`);
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} catch (e) {
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console.error(e);
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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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