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fs.to.playlist.script

//download.js v3.0, by dandavis; 2008-2014. [CCBY2] see http://danml.com/download.html for tests/usage
// v1 landed a FF+Chrome compat way of downloading strings to local un-named files, upgraded to use a hidden frame and optional mime
// v2 added named files via a[download], msSaveBlob, IE (10+) support, and window.URL support for larger+faster saves than dataURLs
// v3 added dataURL and Blob Input, bind-toggle arity, and legacy dataURL fallback was improved with force-download mime and base64 support

// data can be a string, Blob, File, or dataURL




function download(data, strFileName, strMimeType) {

  var self = window, // this script is only for browsers anyway...
    u = "application/octet-stream", // this default mime also triggers iframe downloads
    m = strMimeType || u,
    x = data,
    D = document,
    a = D.createElement("a"),
    z = function (a) {
      return String(a);
    },


    B = self.Blob || self.MozBlob || self.WebKitBlob || z,
    BB = self.MSBlobBuilder || self.WebKitBlobBuilder || self.BlobBuilder,
    fn = strFileName || "download",
    blob,
    b,
    ua,
    fr;

  //if(typeof B.bind === 'function' ){ B=B.bind(self); }

  if (String(this) === "true") { //reverse arguments, allowing download.bind(true, "text/xml", "export.xml") to act as a callback
    x = [x, m];
    m = x[0];
    x = x[1];
  }



  //go ahead and download dataURLs right away
  if (String(x).match(/^data\:[\w+\-]+\/[\w+\-]+[,;]/)) {
    return navigator.msSaveBlob ? // IE10 can't do a[download], only Blobs:
      navigator.msSaveBlob(d2b(x), fn) :
      saver(x); // everyone else can save dataURLs un-processed
  } //end if dataURL passed?

  try {

    blob = x instanceof B ?
      x :
      new B([x], {
        type: m
      });
  } catch (y) {
    if (BB) {
      b = new BB();
      b.append([x]);
      blob = b.getBlob(m); // the blob
    }

  }



  function d2b(u) {
    var p = u.split(/[:;,]/),
      t = p[1],
      dec = p[2] == "base64" ? atob : decodeURIComponent,
      bin = dec(p.pop()),
      mx = bin.length,
      i = 0,
      uia = new Uint8Array(mx);

    for (i; i < mx; ++i) uia[i] = bin.charCodeAt(i);

    return new B([uia], {
      type: t
    });
  }

  function saver(url, winMode) {


    if ('download' in a) { //html5 A[download]
      a.href = url;
      a.setAttribute("download", fn);
      a.innerHTML = "downloading...";
      D.body.appendChild(a);
      setTimeout(function () {
        a.click();
        D.body.removeChild(a);
        if (winMode === true) {
          setTimeout(function () {
            self.URL.revokeObjectURL(a.href);
          }, 250);
        }
      }, 66);
      return true;
    }

    //do iframe dataURL download (old ch+FF):
    var f = D.createElement("iframe");
    D.body.appendChild(f);
    if (!winMode) { // force a mime that will download:
      url = "data:" + url.replace(/^data:([\w\/\-\+]+)/, u);
    }


    f.src = url;
    setTimeout(function () {
      D.body.removeChild(f);
    }, 333);

  } //end saver


  if (navigator.msSaveBlob) { // IE10+ : (has Blob, but not a[download] or URL)
    return navigator.msSaveBlob(blob, fn);
  }

  if (self.URL) { // simple fast and modern way using Blob and URL:
    saver(self.URL.createObjectURL(blob), true);
  } else {
    // handle non-Blob()+non-URL browsers:
    if (typeof blob === "string" || blob.constructor === z) {
      try {
        return saver("data:" + m + ";base64," + self.btoa(blob));
      } catch (y) {
        return saver("data:" + m + "," + encodeURIComponent(blob));
      }
    }

    // Blob but not URL:
    fr = new FileReader();
    fr.onload = function (e) {
      saver(this.result);
    };
    fr.readAsDataURL(blob);
  }
  return true;
} /* end download() */

/**
 * Traverses the DOM nodes upwards to find a parent element with the specified class
 * @param  {DOM Node} child       Child node
 * @param  {String} parentClass Parent class
 * @return {Dom Node / null}    Parent node with the specified class or null
 */
function getParentFolder(child, parentClass) {
  var parent = child.parentNode;
  if (parent.className === parentClass) {
    return parent;
  } else if (parent.tagName.toLowerCase() === 'body') {
    return null;
  } else {
    return getParentFolder(parent, parentClass);
  }
}

/**
 * Gets video URL addresses and titles
 * @return {Object / null} Collection of videos or null
 */
function getVideoLinks() {
  var folderClass = 'folder-current',
    folderEl = document.querySelector('.' + folderClass);

  if (!folderEl) {
    return null;
  }

  var seasonFolderClass = 'folder',
    videoTitleClass = 'b-tab-item__title-inner',
    videoTitle = document.querySelector('.' + videoTitleClass).querySelector('span').innerHTML.replace(/[^a-zAа-яА-Я\d]/g, ''),
    videoSeasonEl = getParentFolder(folderEl, seasonFolderClass),
    videoSeason = videoSeasonEl ? videoSeasonEl.querySelector('.header a b').innerHTML.replace(/ /g, '') : null,
    videoClass = 'b-file-new',
    videoEls = folderEl.querySelectorAll('.' + videoClass),
    linkClass = 'b-file-new__link-material-download',
    data = {
      title: videoTitle + '_' + (videoSeason ? videoSeason : ''),
      videos: []
    };

  for (var i = 0; i < videoEls.length; i++) {
    var video = {};

    //Get only the videos currently displayed on page
    if (videoEls[i].style.display !== 'none') {

      //Get URL
      video.href = videoEls[i].querySelectorAll('.' + linkClass)[0].href;

      //Get meta
      var splitHref = video.href.split('/');
      video.meta = decodeURIComponent(splitHref[splitHref.length - 1]).replace(/[+]/g, ' ').toLowerCase();

      //Add video to the collection
      data.videos.push(video);
    }
  }

  return data.videos.length > 0 ? data : null;
}

/**
 * Creates plain text file containing M3U playlist
 * @param  {Array} videos Collection of video URL addresses and meta data
 * @return {String}        Playlist
 */
function createPlaylist(videos) {
  var playlist = '#EXTM3U \n';
  for (var i = 0; i < videos.length; i++) {
    var video = '#EXTINF:' + (i + 1) + ', ' + videos[i].meta + '\n' + videos[i].href + '\n';
    playlist = playlist.concat(video);
  }
  return playlist;
}

/**
 * Create markup for the popup containing the videos
 * @param  {Array} videos Collection of video URL addresses and meta data
 * @return {document fragment}        Popup markup
 */
function createPopupMarkup(data) {
  var bodyRect = document.querySelector('body').getBoundingClientRect(),
    popupId = 'bml-popup-' + Date.now(),
    downloadBtnId = 'bml-download-playlist',
    dismissBtnId = 'bml-dismiss';

  /**
   * Prompts downloading of plain text file
   */
  function onClick(ev) {
    if (ev.target.id === downloadBtnId) {
      var fileName = data.title + '.m3u';
      download(createPlaylist(data.videos), fileName, 'text/plain');
    } else if (ev.target.id === dismissBtnId) {
      var html = document.querySelector('html'),
        popup = document.querySelector('#' + popupId);
      popup.parentNode.removeChild(popup);
      html.style.overflow = 'auto';
    }
  }

  var frag = document.createDocumentFragment(),
    popup = document.createElement('div'),
    heading = document.createElement('p'),
    list = document.createElement('ul'),
    downloadBtn = document.createElement('button'),
    dismissBtn = document.createElement('button'),
    popupPadding = 24;

  //Popup styles
  popup.style.background = '#fff';
  popup.style.position = 'absolute';
  popup.style.top = (-bodyRect.top) + 'px';
  popup.style.bottom = (-bodyRect.top) + window.innerHeight + 'px';
  popup.style.right = 0;
  popup.style.left = '50%';
  popup.style.minWidth = '300px';
  popup.style.minHeight = window.innerHeight - popupPadding * 2 + 'px';
  popup.style.padding = popupPadding + 'px';
  popup.style.overflow = 'scroll';
  popup.style.fontFamily = 'Helvetica, Arial, sans-serif';
  popup.style.fontSize = '16px';
  popup.style.lineHeight = '1.618';
  popup.style.transform = 'translate(-50%, 0)';
  popup.style.zIndex = 9999;
  popup.style.boxShadow = '0px 0px 10px 5px hsla(0, 0%, 0%, .3333)';

  heading.textContent = data.title;
  heading.style.fontSize = '20px';
  heading.style.marginBottom = '12px';
  popup.appendChild(heading);

  for (var i = 0; i < data.videos.length; i++) {
    var item = document.createElement('li');
    link = document.createElement('a');
    link.href = data.videos[i].href;
    link.textContent = data.videos[i].meta;
    item.appendChild(link);
    list.appendChild(item);
  }

  list.style.marginBottom = '20px';

  popup.appendChild(list);

  //Download button base
  downloadBtn.type = 'button';
  downloadBtn.textContent = 'Download playlist';
  downloadBtn.id = downloadBtnId;

  //Download button styles
  downloadBtn.style.width = '100%';
  downloadBtn.style.padding = '12px 16px';
  downloadBtn.style.fontSize = '16px';
  downloadBtn.style.color = '#fff';
  downloadBtn.style.background = '#0074D9';
  downloadBtn.style.marginBottom = '12px';
  downloadBtn.style.cursor = 'pointer';

  //Add button to popup
  popup.appendChild(downloadBtn);

  //Dismiss button base
  dismissBtn.type = 'button';
  dismissBtn.textContent = 'Dismiss';
  dismissBtn.id = dismissBtnId;

  //Dismiss button styles
  dismissBtn.style.width = '100%';
  dismissBtn.style.padding = '12px 16px';
  dismissBtn.style.fontSize = '16px';
  dismissBtn.style.color = '#fff';
  dismissBtn.style.background = '#AAAAAA';
  dismissBtn.style.marginBottom = '12px';
  dismissBtn.style.cursor = 'pointer';

  //Add button to popup
  popup.appendChild(dismissBtn);

  //Add event listener for download and dismiss buttons
  document.addEventListener('click', onClick);

  popup.id = popupId;

  frag.appendChild(popup);

  return frag;
}

/**
 * Attach the document fragment to document body
 * @param  {document fragment} frag [description]
 */
function attachFrag(frag) {
  var html = document.querySelector('html'),
    body = document.querySelector('body');

  html.style.overflow = 'hidden';

  body.appendChild(frag);
}

/**
 * Init extraction of the playlist from fs.to
 */
function init() {
  var data = getVideoLinks();

  if (data) {
    createPlaylist(data);
    attachFrag(createPopupMarkup(data));
  } else {
    alert('Pick videos folder first.');
  }
}

init();