Convert to sessionStorage instead, added docs.
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2 changed files with 36 additions and 24 deletions
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@ -2,3 +2,5 @@
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Captcha solver for skillrack.
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Use GreaseMonkey/TamperMonkey to run the script.
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__Note:__ Attempting to navigate the page while the captcha solver is running may lead to unintended effects. If it gets stuck in a loop, closing and opening the tabs will fix it.
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@ -19,24 +19,29 @@
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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 ==
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"https://www.skillrack.com/faces/candidate/codeprogramgroup.xhtml"
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) {
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if (localStorage.getItem("Solvebtnid"))
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localStorage.removeItem("Solvebtnid");
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if (localStorage.getItem("captchaFail"))
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localStorage.removeItem("captchaFail");
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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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// Check if the clicked element is a button
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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 so, log the button text
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if (event.target.textContent === "Solve") {
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localStorage.setItem("Solvebtnid", event.target.parentNode.id);
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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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@ -44,12 +49,15 @@
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// Wait for window to load
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window.addEventListener("load", function () {
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if (localStorage.getItem("captchaFail")) {
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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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"Detected captcha fail. Attempting to open last open page."
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);
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localStorage.removeItem("captchaFail");
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const old = localStorage.getItem("Solvebtnid");
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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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@ -58,7 +66,8 @@
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}
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console.log("Checking for captchas");
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// Step 1: Get the Image
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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 ==
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@ -78,6 +87,7 @@
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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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@ -88,37 +98,35 @@
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alert("Unable to solve captcha :(");
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return;
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}
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localStorage.setItem("captchaFail", "true");
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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_5r");
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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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if (localStorage.getItem("captchaFail")) {
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localStorage.removeItem("captchaFail");
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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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// Set canvas dimensions to match the image
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canvas.width = image.width;
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canvas.height = image.height;
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// Draw the image onto the canvas
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ctx.drawImage(image, 0, 0);
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// Invert colors using globalCompositeOperation
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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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// 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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@ -126,14 +134,14 @@
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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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// Step 2: Image Processing with Tesseract.js
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// Image Processing with Tesseract.js
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Tesseract.recognize(invertedimg, "eng", {
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whitelist: "1234567890+=",
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psm: 7,
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})
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.then(({ data: { text } }) => {
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console.log(`OCR: ${new Date().getTime() - time} ms.`);
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// Step 3: Solve the Math Problem
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// Solve the Math Problem
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try {
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const result = getNums(text);
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console.log(
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@ -141,6 +149,8 @@
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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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