YouTube - whitelist channels in uBlock

Helps whitelist YouTube channels in uBlock

// ==UserScript==
// @name        YouTube - whitelist channels in uBlock
// @namespace   https://github.com/SivaMachina
// @author      Siva Machina
// @credits     Alex Vallet, Gantt, Gingerbread Man
// @description Helps whitelist YouTube channels in uBlock
// @include     http://*.youtube.com/*
// @include     https://*.youtube.com/*
// @version     1.0
// @grant       none
// @license     http://creativecommons.org/licenses/by-sa/4.0/
// @supportURL  none
// ==/UserScript==

// For static pages
var uo = document.querySelector('#watch7-content link[href*="/user/"]');
var uv = document.querySelector('.yt-user-info > a[href*="/channel/"]');
if (uo) {
  addMenu();
  var ut = uo.href.slice(uo.href.lastIndexOf("/")+1);
  if (location.href.search("&user=") == -1) location.replace(location.href+"&user="+ut);
}
else if (uv) {
  addMenu();
  var ut = uv.textContent;
  if (location.href.search("&user=") == -1) location.replace(location.href+"&user="+ut);
}

// For dynamic content changes, like when clicking a video on the main page.
// This bit is based on Gantt's excellent Download YouTube Videos As MP4 script:
// https://github.com/gantt/downloadyoutube
var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {
    if (mutation.addedNodes !== null) {
      for (i = 0; i < mutation.addedNodes.length; i++) {
        if (mutation.addedNodes[i].id == "watch7-container") {
          addMenu();
          var uo = document.querySelector('#watch7-content link[href*="/user/"]');
          var uv = document.querySelector('.yt-user-info > a[href*="/channel/"]');
          if (uo) {
            addMenu();
            var ut = uo.href.slice(uo.href.lastIndexOf("/")+1);
            if (location.href.search("&user=") == -1) location.replace(location.href+"&user="+ut);
            break;
          }
          else if (uv) {
            addMenu();
            var ut = uv.textContent;
            if (location.href.search("&user=") == -1) location.replace(location.href+"&user="+ut);
            break;
          } 
        }
      }
    }
  });
});
observer.observe(document.body, {childList: true, subtree: true});

// Add the context menu to the user name below the video
// Only works in Firefox
function addMenu() {

  var uh = document.getElementById("watch7-user-header");
  var menu = document.createElement("menu");
  menu.setAttribute("id", "abpfilter");
  menu.setAttribute("type", "context");
  var mione = document.createElement("menuitem");
  // uBlock is registered under the GPLv3 license 
  mione.setAttribute("label", "Ublock: toggle whitelist filter uBlock"); 
  mione.setAttribute("icon","data:image/svg+xml;base64,<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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   width="128"
   height="128"
   id="svg2"
   version="1.1"
   inkscape:version="0.48.4 r9939"
   sodipodi:docname="ublock.svg"
   inkscape:export-filename="/home/rhill/permahome/workshop/ublock/src/img/icon_16.png"
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     inkscape:zoom="2"
     inkscape:cx="75.382623"
     inkscape:cy="115.10271"
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     inkscape:current-layer="layer1"
     showgrid="true"
     inkscape:window-width="1804"
     inkscape:window-height="1030"
     inkscape:window-x="6"
     inkscape:window-y="25"
     inkscape:window-maximized="0"
     fit-margin-top="5"
     fit-margin-left="5"
     fit-margin-right="5"
     fit-margin-bottom="5"
     inkscape:snap-bbox="true"
     showguides="true"
     inkscape:guide-bbox="true"
     showborder="true"
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        <dc:type
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");
  menu.appendChild(mione);
  document.body.appendChild(menu);
  uh.setAttribute("contextmenu","abpfilter");

  function abpShowFilter() {
    var fpo = "*youtube.com/*&user=";
    var fpt = "*";
    if (uo) var ut = uo.href.slice(uo.href.lastIndexOf("/")+1);
    else if (uv) var ut = uv.textContent;
    var ffl = fpo+ut+fpt;
    var wh = document.getElementById("watch8-action-buttons");
    var wlf = wh.parentNode.querySelector("#whitelistfilter");
    if (!wlf && ffl) {
      var div = document.createElement("div");
      div.setAttribute("id","whitelistfilter");
      div.innerHTML = "Add the following filter to uBlock:";
      var textarea = document.createElement("textarea");
      textarea.setAttribute("style", "display: block; font-family: monospace");
      textarea.setAttribute("spellcheck","false");
      textarea.setAttribute("rows","1");
      textarea.setAttribute("cols",ffl.length);
      textarea.innerHTML = ffl;
      div.appendChild(textarea);
      wh.parentNode.appendChild(div);
      textarea.focus();
    }
    else wh.parentNode.removeChild(wlf);
  }

  mione.addEventListener("click",abpShowFilter,false);

}