// ==UserScript==// @name        Facebook video downloader// @icon        https://www.facebook.com/favicon.ico// @namespace   Violentmonkey Scripts// @match       https://www.facebook.com/*// @match       https://web.facebook.com/*// @grant       GM_registerMenuCommand// @version     1.3// @author      https://github.com/HoangTran0410// @description Download any video on Facebook (post/chat/comment)// @license MIT// ==/UserScript==(() => {function getOverlapScore(el) {var rect = el.getBoundingClientRect();return (Math.min(rect.bottom,window.innerHeight || document.documentElement.clientHeight) - Math.max(0, rect.top));}function getVideoIdFromVideoElement(video) {try {for (let k in video.parentElement) {if (k.startsWith("__reactProps")) {return video.parentElement[k].children.props.videoFBID;}}} catch (e) {return null;}}async function getWatchingVideoId() {let allVideos = Array.from(document.querySelectorAll("video"));let r###lt = [];for (let video of allVideos) {let videoId = getVideoIdFromVideoElement(video);if (videoId) {r###lt.push({videoId,overlapScore: getOverlapScore(video),playing: !!(video.currentTime > 0 &&!video.paused &&!video.ended &&video.readyState > 2),});}}// if there is playing video => return thatlet playingVideo = r###lt.find((_) => _.playing);if (playingVideo) return [playingVideo.videoId];// else return all videos in-viewportreturn r###lt.filter((_) => _.videoId && (_.overlapScore > 0 || _.playing)).sort((a, b) => b.overlapScore - a.overlapScore).map((_) => _.videoId);}async function getVideoUrlFromVideoId(videoId) {let dtsg = await getDtsg();try {return await getLinkFbVideo2(videoId, dtsg);} catch (e) {return await getLinkFbVideo1(videoId, dtsg);}}async function getLinkFbVideo2(videoId, dtsg) {let res = await fetch("https://www.facebook.com/video/video_data_async/?video_id=" + videoId,{method: "POST",headers: { "content-type": "application/x-www-form-urlencoded" },body: stringifyVariables({__a: "1",fb_dtsg: dtsg,}),});let text = await res.text();text = text.replace("for (;;);", "");let json = JSON.parse(text);const { hd_src, hd_src_no_ratelimit, sd_src, sd_src_no_ratelimit } =json?.payload || {};return hd_src_no_ratelimit || hd_src || sd_src_no_ratelimit || sd_src;}async function getLinkFbVideo1(videoId, dtsg) {let res = await fetchGraphQl("5279476072161634", {UFI2CommentsProvider_commentsKey: "CometTahoeSidePaneQuery",caller: "CHANNEL_VIEW_FROM_PAGE_TIMELINE",displayCommentsContextEnableComment: null,displayCommentsContextIsAdPreview: null,displayCommentsContextIsAggregatedShare: null,displayCommentsContextIsStorySet: null,displayCommentsFeedbackContext: null,feedbackSource: 41,feedLocation: "TAHOE",focusCommentID: null,privacySelectorRenderLocation: "COMET_STREAM",renderLocation: "video_channel",scale: 1,streamChainingSection: !1,useDefaultActor: !1,videoChainingContext: null,videoID: videoId,}, dtsg);let text = await res.text();let a = JSON.parse(text.split("\n")[0]),link = a.data.video.playable_url_quality_hd || a.data.video.playable_url;return link;}function fetchGraphQl(doc_id, variables, dtsg) {return fetch("https://www.facebook.com/api/graphql/", {method: "POST",headers: {"content-type": "application/x-www-form-urlencoded",},body: stringifyVariables({doc_id: doc_id,variables: JSON.stringify(variables),fb_dtsg: dtsg,server_timestamps: !0,}),});}function stringifyVariables(d, e) {let f = [],a;for (a in d)if (d.hasOwnProperty(a)) {let g = e ? e + "[" + a + "]" : a,b = d[a];f.push(null !== b && "object" == typeof b? stringifyVariables(b, g): encodeURIComponent(g) + "=" + encodeURIComponent(b));}return f.join("&");}async function getDtsg() {return require("DTSGInitialData").token;}function downloadURL(url, name) {var link = document.createElement("a");link.target = "_blank";link.download = name;link.href = url;document.body.appendChild(link);link.click();document.body.removeChild(link);}async function downloadWatchingVideo() {try {let listVideoId = await getWatchingVideoId();if (!listVideoId?.length > 0) throw Error("No video found in the page");console.log(listVideoId)for (let videoId of listVideoId) {let videoUrl = await getVideoUrlFromVideoId(videoId);if (videoUrl) downloadURL(videoUrl, "fb_video.mp4");}} catch (e) {alert("ERROR: " + e);}}function resisterMenuCommand() {GM_registerMenuCommand("Download watching video", downloadWatchingVideo);}resisterMenuCommand();})();