Fuck kaltura. It's shit
当前为
// ==UserScript==
// @name NTU Kaltura Downloader
// @namespace https://greasyfork.org/en/users/86284-benjababe
// @version 1.1.7
// @description Fuck kaltura. It's shit
// @author Benjababe
// @license MIT
// @match https://ntulearn.ntu.edu.sg/webapps/*
// @match https://ntulearnv.ntu.edu.sg/media/*
// @match https://ntulearnv.ntu.edu.sg/playlist/dedicated/*
// @grant none
// ==/UserScript==
// jshint esversion: 8
(function () {
const partnerID = "117",
sourceTemplate = `https://api.sg.kaltura.com/p/${partnerID}/sp/${partnerID}00/playManifest/entryId/%ENTRY_ID_HERE%/format/download/protocol/https/flavorParamIds/0`,
entryPrefix = "/entry_id/";
console.log(sourceTemplate);
window.onload = () => {
// regular blackboard page with embedded player
if (location.pathname.indexOf("/webapps/blackboard/") == 0) {
genBlackBoard();
}
// kaltura single media
if (location.pathname.includes("/media/t/")) {
genKPage(false);
}
// kaltura playlist
if (location.pathname.includes("/playlist/dedicated/")) {
genKPage(true);
}
};
let genBlackBoard = () => {
console.log("NTU Kaltura Downloader running...");
genEmbeddedVideos();
genLinks();
};
// generates download button for embedded kaltura videos in blackboard page (eg. CZ1106)
let genEmbeddedVideos = () => {
let iframes = Array.from(document.getElementsByTagName("iframe"));
iframes.forEach((iframe) => {
let src = iframe.src,
sIndex = src.indexOf(entryPrefix);
//stops if it isn't a kultura video iframe
if (sIndex != -1) {
let eidIndex = src.indexOf(entryPrefix) + entryPrefix.length;
src = src.substring(eidIndex);
let entryID = src.substring(0, src.indexOf("/")),
sourceURL = sourceTemplate.replace("%ENTRY_ID_HERE%", entryID);
appendDownloadButton(iframe, sourceURL);
}
});
};
// generated download button for <a> tags to kaltura videos in blackboard page (eg. CZ2002)
let genLinks = () => {
let links = Array.from(document.querySelectorAll("a[target]"));
links.forEach((link) => {
if (link.href.indexOf("https://api.sg.kaltura.com") == 0) {
let url = link.href,
entryID = url.split("entry_id=")[1],
sourceURL = sourceTemplate.replace("%ENTRY_ID_HERE%", entryID);
appendDownloadButton(link, sourceURL);
}
});
};
// generates download button in the kaltura media gallery (eg. CZ2005)
let genKPage = (playlist = false) => {
let sourceURL = getSourceURL(playlist);
listenDOM(playlist);
};
// returns video source URL using entry ID in current URL
let getSourceURL = (playlist = false) => {
let path = location.pathname, entryID, sourceURL;
let pathSpl = path.replace("/media/t/", "").split("/");
if (playlist) {
entryID = pathSpl[pathSpl.length - 1];
}
else {
entryID = pathSpl[0];
}
sourceURL = sourceTemplate.replace("%ENTRY_ID_HERE%", entryID);
return sourceURL;
};
// appends download button with sourceURL to whatever element is passed through sibling argument
let appendDownloadButton = (sibling, sourceURL) => {
let dlBtn = document.createElement("button");
dlBtn.innerText = "Download";
dlBtn.style.position = "absolute";
dlBtn.style.userSelect = "none";
dlBtn.style.marginLeft = "10px";
dlBtn.onclick = (e) => { window.location.href = sourceURL; e.target.blur(); };
sibling.parentNode.appendChild(dlBtn);
};
// larger video should have a poster attribute with entry_id
let getLargerVidEntryID = (kVideo) => {
let posterURL = kVideo.getAttribute("poster"),
posterRegex = /entry_id\/([\w]+)\//,
match = posterURL.match(posterRegex);
return match[1];
};
// appends download to action list when it is detected in MutationObserver
// whole page doesn't load in at once in this scenario
let listenDOM = (playlist = false) => {
let observer = new window.MutationObserver(function (mutations, observer) {
let ul = document.querySelector("ul#entryActionsMenu");
// only appends when the "ACTIONS" dropdown list is loaded in
if (ul != undefined) {
let btnDl = document.querySelectorAll(".btn-dl");
// remove previously added download buttons
if (btnDl != undefined) {
for (let i = 0; i < btnDl.length; i++) {
btnDl[i].remove();
}
}
// needs to look into inner iframe context to search for video element
let kplayerIFrame = document.querySelector("#kplayer_ifp"),
kplayerIFrameDOM = kplayerIFrame.contentWindow.document.body,
kVideos = Array.from(kplayerIFrameDOM.getElementsByTagName("video"));
// for each video, insert a download button
for (let i = 0; i < kVideos.length; i++) {
let kVideo = kVideos[i],
sourceURL = "",
entryID = 0;
// TODO there HAS to be a simpler way than doing this manual search
// this should be the smaller video by default
if (kVideo.hasAttribute("kentryid")) {
entryID = kVideo.getAttribute("kentryid");
}
// this should be the bigger video by default
else {
entryID = getLargerVidEntryID(kVideo);
}
sourceURL = sourceTemplate.replace("%ENTRY_ID_HERE%", entryID);
// inserts download button into dropdown list
let li = document.createElement("li"),
a = document.createElement("a"),
span = document.createElement("span");
span.innerText = `Download Source ${i + 1}`;
a.appendChild(span);
a.href = sourceURL;
li.appendChild(a);
li.className = "btn-dl";
li.setAttribute("role", "presentation");
ul.appendChild(li);
}
}
});
observer.observe(document, {
subtree: true,
attributes: true
});
};
})();