ThreadsDownloader

Extract and download videos from Threads
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// ==UserScript==
// @name         ThreadsDownloader
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Extract and download videos from Threads
// @author       Just Enough
// @homepageURL  https://www.conech.net/
// @match        *://*.threads.com/*
// @grant        none
// @license      MIT2
// ==/UserScript==

(function () {
    'use strict';

    const BUTTON_CLASS = 'threads-extract-download-btn';

    const generateFilename = () => {
        const now = new Date();
        const pad = (n) => n.toString().padStart(2, '0');

        const timestamp = [
            now.getFullYear(),
            pad(now.getMonth() + 1),
            pad(now.getDate())
        ].join('') + '_' + [
            pad(now.getHours()),
            pad(now.getMinutes()),
            pad(now.getSeconds())
        ].join('');

        return `ThreadsExtract_${timestamp}.mp4`;
    };

    const createDownloadIcon = () => {
        const svgNS = 'http://www.w3.org/2000/svg';

        const svg = document.createElementNS(svgNS, 'svg');
        svg.setAttribute('width', '18');
        svg.setAttribute('height', '18');
        svg.setAttribute('viewBox', '0 0 24 24');
        svg.setAttribute('fill', 'white');

        const path = document.createElementNS(svgNS, 'path');
        path.setAttribute('d', 'M12 16l-5-5h3V4h4v7h3l-5 5zm-7 2h14v2H5v-2z');

        svg.appendChild(path);
        return svg;
    };

    const findRootContainer = (element) => {
        let current = element;

        while (current && current.parentElement) {
            const parent = current.parentElement;

            if (parent.querySelector('video')) {
                return parent;
            }

            current = parent;
        }

        return null;
    };

    const downloadVideo = async (video) => {
        const src = video.currentSrc || video.src;

        if (!src) {
            alert('Video source not found');
            return;
        }

        try {
            const response = await fetch(src);
            const blob = await response.blob();

            const blobUrl = URL.createObjectURL(blob);

            const link = document.createElement('a');
            link.href = blobUrl;
            link.download = generateFilename();

            document.body.appendChild(link);
            link.click();

            URL.revokeObjectURL(blobUrl);
            document.body.removeChild(link);
        } catch (error) {
            console.error('Download failed:', error);
            alert('Failed to download video');
        }
    };

    const createDownloadButton = (video) => {
        const button = document.createElement('button');
        button.className = BUTTON_CLASS;
        button.appendChild(createDownloadIcon());

        Object.assign(button.style, {
            position: 'absolute',
            top: '8px',
            right: '8px',
            zIndex: '999999',
            width: '32px',
            height: '32px',
            display: 'flex',
            alignItems: 'center',
            justifyContent: 'center',
            background: 'rgba(0,0,0,0.6)',
            border: 'none',
            borderRadius: '50%',
            cursor: 'pointer'
        });

        button.addEventListener('click', (event) => {
            event.preventDefault();
            event.stopPropagation();
            downloadVideo(video);
        }, true);

        return button;
    };

    const attachButtonToPlayer = (player, video) => {
        if (player.querySelector(`.${BUTTON_CLASS}`)) return;

        const computedStyle = window.getComputedStyle(player);
        if (computedStyle.position === 'static') {
            player.style.position = 'relative';
        }

        const button = createDownloadButton(video);
        player.appendChild(button);
    };

    const scanPlayers = () => {
        const players = document.querySelectorAll('[aria-label="Video player"]');

        players.forEach((player) => {
            const root = findRootContainer(player);
            if (!root) return;

            const video = root.querySelector('video');
            if (!video) return;

            attachButtonToPlayer(player, video);
        });
    };

    const initObserver = () => {
        const observer = new MutationObserver(scanPlayers);
        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
    };

    const init = () => {
        scanPlayers();
        initObserver();
    };

    init();

})();