Facebook Photos Bulk Downloader (Background Support)

来自缓存
Greasy Fork is available in English.
Facebook Photos Bulk Downloader (Background Support)

Bulk download Facebook album photos in full resolution, supports background downloading
当前为 2024-11-14 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Facebook Photos Bulk Downloader (Background Support)
// @namespace    麦克
// @version      2.1.2
// @description  Bulk download Facebook album photos in full resolution, supports background downloading
// @author       麦克
// @match        https://www.facebook.com/*/photos/*
// @match        https://www.facebook.com/photo.php?*
// @match        https://www.facebook.com/photo?*
// @match        https://www.facebook.com/photo/*
// @grant        GM_download
// @grant        GM_notification
// @license      GPL-3.0-or-later
// ==/UserScript==

let iter = 0;
let MAXITER = 10;
const isDebug = true;
let isDownloading = false;
let stopDownload = false;

// 防止页面自动刷新或导航导致下载中断
window.addEventListener('beforeunload', function (event) {
    if (isDownloading) {
        event.preventDefault();
        event.returnValue = '';
    }
});

// 监听 Facebook 异步导航并恢复下载
window.addEventListener('popstate', function () {
    if (isDownloading) {
        console.log('Page navigation detected, resuming download...');
        setTimeout(batchDownload, 1000);
    }
});

// 创建 Fetch 按钮，并确保其持久存在
(function () {
    const observer = new MutationObserver(() => {
        if (document.body && !document.querySelector('#fetch-button')) {
            let fetchBtn = document.createElement("div");
            fetchBtn.id = "fetch-button";
            fetchBtn.textContent = "⇩ Fetch Photos";
            fetchBtn.style.cssText = 'position:fixed;top:10px;right:10px;z-index:9999;padding:8px;background-color:#4caf50;color:white;border-radius:5px;cursor:pointer;';
            fetchBtn.onclick = startBatchDownload;
            document.body.appendChild(fetchBtn);
        }
    });
    observer.observe(document.body, { childList: true, subtree: true });
})();

// 获取当前图片 URL
function getImageUrl() {
    const imgElement = document.querySelector('img[src*="scontent"]');
    return imgElement ? imgElement.src : null;
}

// 点击“下一张”按钮
function clickNextImage() {
    const nextBtn = document.querySelector('div[aria-label="下一张"], div[aria-label="Next"]');
    if (nextBtn) {
        nextBtn.click();
        return true;
    } else {
        const complexNextBtn = document.querySelector('div[role="button"][tabindex="0"] div[style*="background-image"]');
        if (complexNextBtn) {
            complexNextBtn.click();
            return true;
        }
    }
    return false;
}

// 下载图片并确保完成后翻页
function downloadImage(imgUrl, callback) {
    if (imgUrl) {
        const filename = imgUrl.split('?')[0].split('/').pop();
        console.log(`Downloading: ${filename}`);
        GM_download({
            url: imgUrl,
            name: filename,
            saveAs: false,
            onload: callback, // 下载完成后翻页
            onerror: callback, // 即使下载失败也继续下一张
        });
    } else {
        console.error('Failed to fetch image URL.');
        callback();
    }
}

// 批量处理函数（支持后台运行）
function batchDownload() {
    if (iter >= MAXITER || stopDownload) {
        console.log('Download limit reached or stopped by user.');
        GM_notification({
            text: `Download completed: ${iter} photos`,
            title: 'Facebook Bulk Downloader',
            timeout: 5000
        });
        isDownloading = false;
        return;
    }

    const imgUrl = getImageUrl();
    if (imgUrl) {
        downloadImage(imgUrl, () => {
            iter++;
            if (clickNextImage()) {
                console.log(`Moving to image ${iter + 1}`);
                setTimeout(batchDownload, 1000); // 等待 1 秒后继续下载
            } else {
                console.log('No more images found or failed to click next.');
                GM_notification({
                    text: `Download completed: ${iter} photos`,
                    title: 'Facebook Bulk Downloader',
                    timeout: 5000
                });
                isDownloading = false;
            }
        });
    } else {
        console.error('Retry fetching image...');
        setTimeout(() => {
            if (!stopDownload) batchDownload();
        }, 1000);
    }
}

// 开始批量下载
function startBatchDownload() {
    if (isDownloading) {
        console.warn('Download already in progress.');
        return;
    }
    iter = 0;
    stopDownload = false;
    MAXITER = parseInt(prompt("Enter the number of photos to download:", "10")) || 10;
    console.log(`Starting download of ${MAXITER} photos...`);
    isDownloading = true;
    GM_notification({
        text: 'Download started...',
        title: 'Facebook Bulk Downloader',
        timeout: 3000
    });
    batchDownload();
}

// 监听页面切换时继续执行
window.addEventListener('visibilitychange', function () {
    if (document.visibilityState === 'hidden' && isDownloading) {
        console.log('Running in the background...');
    } else if (document.visibilityState === 'visible' && isDownloading) {
        console.log('Resuming download...');
    }
});

// 用户随时可停止下载
document.addEventListener('keydown', function (e) {
    if (e.key === 'Escape' && isDownloading) {
        stopDownload = true;
        isDownloading = false;
        console.log('Download stopped by user.');
        GM_notification({
            text: 'Download stopped by user.',
            title: 'Facebook Bulk Downloader',
            timeout: 3000
        });
    }
});