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Export YouTube Subscriptions to RSS OPML

Adds an export button to the subscriptions section of the sidebar, which generates an OPML file of RSS feeds for your subscriptions.

Verze ze dne 13. 12. 2020. Zobrazit nejnovější verzi.

// ==UserScript==
// @name         Export YouTube Subscriptions to RSS OPML
// @namespace    https://github.com/theborg3of5/Userscripts/
// @version      0.3
// @description  Adds an export button to the subscriptions section of the sidebar, which generates an OPML file of RSS feeds for your subscriptions.
// @author       Gavin Borg
// @match        https://www.youtube.com/
// ==/UserScript==

function exportSubscriptions() {
    var channels = [];
    var inChannels = false;

    var links = document.querySelectorAll("div#items a#endpoint[href]"); // Sidebar links
    for(var i = 0; i < links.length; i++) {
        var href = links[i].href;
        var title = links[i].getAttribute("title");

        if(href.indexOf("www.youtube.com/channel/") > -1) { // Found our first channel
            inChannels = true;
        }

        if(inChannels) {
            if(href.indexOf("www.youtube.com/channel/") === -1) { // Once we're in the channels block, any link that's not to a channel means we've exited it and are finished.
                break;
            }

            var channelId = href.substring(href.lastIndexOf("www.youtube.com/channel/") + "www.youtube.com/channel/".length, href.length);
            channels.push({"title":title, "id":channelId});
        }
    }

    // Build XML for OPML file
    var xml = buildXML(channels);

    var fileType = "text/plain";
    var blob = new Blob([xml], {type: fileType});
    var blobURL = window.URL.createObjectURL(blob);

    var filename = "youtubeSubscriptions.opml";
    var downloadLink = document.createElement("a");
    downloadLink.setAttribute("href", blobURL);
    downloadLink.setAttribute("download", filename);
    downloadLink.dataset.downloadurl = fileType + ":" + filename + ":" + blobURL;
    downloadLink.click();
}

function buildXML(channels) {
    // Goal structure:
    //  <opml version="1.0">
    //   <head>
    //    <title>YouTube Subscriptions as RSS</title>
    //   </head>
    //   <body>
    //    <outline text="YouTube Subscriptions" title="YouTube Subscriptions">
    //     <outline type="rss" text="" title="" xmlURL="" />
    //     ...
    //    </outline>
    //   </body>
    //  </opml>

    var xmlDoc = document.implementation.createDocument("", "", null);
    var opml = xmlDoc.createElement("opml");
    opml.setAttribute("version", "1.0");

    var head = xmlDoc.createElement("head");
    var title = xmlDoc.createElement("title");
    title.innerHTML = "YouTube Subscriptions as RSS";
    head.appendChild(title);
    opml.appendChild(head);

    var body = xmlDoc.createElement("body");
    var parentOutline = xmlDoc.createElement("outline");
    parentOutline.setAttribute("text", "YouTube Subscriptions")
    parentOutline.setAttribute("title", "YouTube Subscriptions")

    var youtubeRSSPrefix = "https://www.youtube.com/feeds/videos.xml?channel_id=";
    for(var j = 0; j < channels.length; j++) {
        var outline = xmlDoc.createElement("outline");
        outline.setAttribute("type", "rss");
        outline.setAttribute("text", channels[j].title);
        outline.setAttribute("title", channels[j].title);
        outline.setAttribute("xmlUrl", youtubeRSSPrefix + channels[j].id);
        parentOutline.appendChild(outline);
    }

    body.appendChild(parentOutline);

    opml.appendChild(body);
    xmlDoc.appendChild(opml);

    var s = new XMLSerializer();
    return s.serializeToString(xmlDoc);
}

function addButton() {
    // Find the subscriptions section label
    var sectionLabels = document.querySelectorAll("yt-formatted-string#guide-section-title");
    var subscriptionLabel;
    for(var i = 0; i < sectionLabels.length; i++) {
        if(sectionLabels[i].innerHTML === "Subscriptions") {
            subscriptionLabel = sectionLabels[i].parentElement;
            break;
        }
    }

    // Create and insert button
    var button = document.createElement("button");
    button.title = "Export subscriptions as OPML file for RSS readers. Make sure to expand subscriptions in sidebar first.";
    button.innerHTML = "Export";
    button.style.fontWeight = "bold";
    button.style.float = "right";
    button.style.marginBottom = "2px";
    button.style.marginRight = "30px";
    button.id = "exportOPMLButton";
    button.addEventListener("click", exportSubscriptions);
    subscriptionLabel.appendChild(button);
}

window.onload = addButton;