youtube downoader

you.tube.js

var you = function(h, D) {
  var frag = D.createDocumentFragment(),
      count = 0,
      len = 1;
  h("#yt-masthead-content").appendChild(m("div", "", {className: "download"}, {paddingRight: "20px", height: "200px", overflowY: "scroll"}))
  function addLinks(d, r) {
    
    h(".download").appendChild(m("a", 
                                 d.title, 
                                 {className: "links", href: d.url, download: d.title + "." + r}, 
                                 {padding: "5px", display: "block"}))
  }
 
  function m(e, n, c, s, b) {
    b = D.createElement(e)
    b.innerHTML = n
    if(!!c)
      for(var i in c)
        b[i] = c[i]
 
    if(!!s)
      for(var i in s)
        b.style[i] = s[i];
 
    return b;
  }
 
  function jx(b, c, a) {
    return new Promise(function(d, e) {
      a = new XMLHttpRequest;
      a.open("GET", b);
      a.responseType = c || "text";
      a.onload = function() {
        4 == a.readyState ? d(a["response"]) : e(Error(a.statusText));
      };
      a.send(null);
    });
  }
 
  function q(b, c) {
    c = {};
    b.split("&").forEach(function(a) {
      var b = decodeURIComponent(a.split("=")[0]);
      a = decodeURIComponent(a.split("=")[1] || "");
      c[b] = a;
    });
    return c;
  }
 
  function u(b, t, e, d) {
    e = {};
    b.split(",").forEach(function(f, i) {
      d = q(f);
      e[d.quality + " " + d.type.split(";")[0]] = { url: d.url, title: t.split("+").join(" ")};
    });
    return e;
  }
 
  function f() {}
  f.prototype = {durl:"", tube:function(b, c, a) {
    var d = "", e = [], f = this;
    jx("https://www.youtube.com/get_video_info?video_id=" + b, "text").then(function(b) {
      d = q(b);
      c = c || "video/mp4";
      a = a || "medium";
      e = u(d.url_encoded_fmt_stream_map, d.title);
      console.log(e.url);
      d = e[[a, c].join(" ")];
      addLinks(d, c.substring(6))
      count +=1;
      if(count == len) {
        h("#yt-masthead-content").appendChild(frag);
       }
    });
  }, tubes:function(p, c, a, f) {
    f = this;
    jx("https://gdata.youtube.com/feeds/api/playlists/" + p + "?v=2&alt=json", "json").then(function(r) {
      r.feed.entry.forEach(function(t, i, o) {
        t = t.link[1].href.split("/").slice(-2, -1)[0];
        f.tube(t);
        if(len === 1) len = o.length
      })
    })
  }};
 
  return f.prototype;
}($, document);