Downloader for Hakusensha.
// ==UserScript==
// @name Hakusensha Downloader
// @namespace http://tampermonkey.net/
// @version 1.1
// @description Downloader for Hakusensha.
// @author Baconana-chan
// @match https://hakusensha.tameshiyo.me/*
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// Set to store already downloaded images
const downloadedImages = new Set();
// Flag to control whether the script is active
let scriptActive = false;
// Timeout for pausing between block scrolls (to avoid auto-refresh)
const scrollPauseTime = 3000; // Increased pause time to 3 seconds between scrolling blocks
// Create a button to activate/deactivate the script for downloading images
const buttonDownload = document.createElement('button');
buttonDownload.textContent = 'Start Downloading Images';
buttonDownload.style.position = 'fixed';
buttonDownload.style.top = '20px';
buttonDownload.style.right = '20px';
buttonDownload.style.zIndex = '9999'; // Ensure it's above other page elements
buttonDownload.style.padding = '10px';
buttonDownload.style.backgroundColor = '#4CAF50';
buttonDownload.style.color = 'white';
buttonDownload.style.border = 'none';
buttonDownload.style.borderRadius = '5px';
buttonDownload.style.cursor = 'pointer';
document.body.appendChild(buttonDownload);
// Create the retry button (shown when all images are downloaded)
const buttonRetry = document.createElement('button');
buttonRetry.textContent = 'Retry Download';
buttonRetry.style.position = 'fixed';
buttonRetry.style.top = '20px';
buttonRetry.style.right = '220px';
buttonRetry.style.zIndex = '9999';
buttonRetry.style.padding = '10px';
buttonRetry.style.backgroundColor = '#f44336'; // Red color for retry button
buttonRetry.style.color = 'white';
buttonRetry.style.border = 'none';
buttonRetry.style.borderRadius = '5px';
buttonRetry.style.cursor = 'pointer';
buttonRetry.style.display = 'none'; // Initially hidden
document.body.appendChild(buttonRetry);
// Add click event listener to toggle the script on/off
buttonDownload.addEventListener('click', () => {
if (scriptActive) {
scriptActive = false;
buttonDownload.textContent = 'Start Downloading Images';
buttonDownload.style.backgroundColor = '#4CAF50';
} else {
scriptActive = true;
buttonDownload.textContent = 'Stop Downloading Images';
buttonDownload.style.backgroundColor = '#f44336';
startDownloading();
}
});
// Add click event listener for the retry button
buttonRetry.addEventListener('click', () => {
// Do not clear the downloaded images set, just reset the process for the next block
scriptActive = true; // Restart the image download process
buttonRetry.style.display = 'none'; // Hide the retry button
startDownloading(); // Start the process again
});
// Function to extract Base64 images from the page
function extractBase64Images() {
if (!scriptActive) return; // If the script is inactive, stop execution
const images = document.querySelectorAll('img');
let newImagesFound = false;
images.forEach(img => {
if (img.src && img.src.startsWith('data:image/') && !downloadedImages.has(img.src)) {
const base64String = img.src;
const extension = base64String.split(';')[0].split('/')[1];
const fileName = `image_${Date.now()}.${extension}`;
downloadBase64Image(base64String, fileName);
downloadedImages.add(base64String);
newImagesFound = true;
}
});
// If no new images were found, show retry button
if (!newImagesFound) {
buttonRetry.style.display = 'inline-block'; // Show the retry button
}
}
// Function to download the Base64 image
function downloadBase64Image(base64String, fileName) {
const link = document.createElement('a');
link.href = base64String;
link.download = fileName;
link.click();
}
// Function to handle the scrolling logic and image extraction
function startDownloading() {
let currentPage = 0;
let totalPages = getTotalPages(); // Get the total number of blocks/pages
// Start an interval to download images and scroll blocks periodically
const downloadInterval = setInterval(() => {
if (!scriptActive || currentPage >= totalPages) {
return; // Stop the interval if script is inactive or all pages are processed
}
// Extract images from the current block
extractBase64Images();
// Scroll to the next block after a pause
currentPage++;
scrollToNextBlock(currentPage);
}, scrollPauseTime); // Pause between block scrolls to avoid quick refreshes
}
// Function to scroll to the next block (simulating user scroll)
function scrollToNextBlock(page) {
const blocks = document.querySelectorAll('div#book_frame.csr_default');
if (blocks && blocks[page]) {
blocks[page].scrollIntoView({ behavior: 'smooth' });
// After scrolling, try to extract images again from the new block
setTimeout(() => {
extractBase64Images(); // Extract images from the newly loaded block
}, 1000); // Wait 1 second to ensure the new block has loaded
}
}
// Function to get the total number of pages (blocks) from the page indicator
function getTotalPages() {
const pageIndicator = document.querySelector('#page_indicator');
if (pageIndicator) {
const [current, total] = pageIndicator.textContent.split('/').map(x => parseInt(x.trim()));
return total || 0;
}
return 0;
}
// Block the page refresh by preventing the `beforeunload` event
window.addEventListener('beforeunload', (e) => {
e.preventDefault();
e.returnValue = ''; // Standard for modern browsers to show a confirmation dialog
});
// --- Suppression of unexpected reloads (from provided script) ---
(function() {
const patch_func = () => {
const setTimeoutOrig = window.setTimeout;
window.setTimeout = function(func, delay) {
if ((delay < 1000) && (0 <= func.toString().indexOf('"pjax:timeout"'))) {
// function(){l("pjax:timeout",[t,e])&&t.abort("timeout")}
delay = 30000; // Set delay to 30 seconds to avoid reload timeout
}
setTimeoutOrig.call(this, func, delay);
}
};
const script = document.createElement('script');
script.async = false;
script.textContent = '(' + patch_func.toString() + ')();';
document.documentElement.appendChild(script);
})();
})();