YoutubePlaylistsBackup

YoutubePlaylistsBackup.js

function backupYoutubeListsV2(){
  Logger.log('Processing your request: backupYoutubeListsV2');
  
  var driveFile, docFile, lastBackupJson;
  var driveFiles = Drive.Files.list().items;
  for(var i = 0; i < driveFiles.length; i++){
    var title = driveFiles[i].title;
    if(title == "YoutubeListsBackup"){
      driveFile = driveFiles[i];
      break;
    }
  }
  if(driveFile){
    docFile = DocumentApp.openById(driveFile.id);
    lastBackupJson = JSON.parse(docFile.getBody().getText());
  }
  else{
    docFile = DocumentApp.create("YoutubeListsBackup");
  }
  
  var currentBackupJson = {
    lastUpdateDate: new Date(),
    playlists: []
  };
  
  var results = YouTube.Channels.list('contentDetails', { mine: true });
  var channel = results.items[0].contentDetails;
  currentBackupJson.playlists.push(FetchPlaylistItems(channel.relatedPlaylists.favorites, "Favorites"));
  currentBackupJson.playlists.push(FetchPlaylistItems(channel.relatedPlaylists.likes, "Likes"));
  currentBackupJson.playlists.push(FetchPlaylistItems(channel.relatedPlaylists.uploads, "Uploads"));
  currentBackupJson.playlists.push(FetchPlaylistItems(channel.relatedPlaylists.watchHistory, "WatchHistory"));
  currentBackupJson.playlists.push(FetchPlaylistItems(channel.relatedPlaylists.watchLater, "WatchLater"));
  var playlists = YouTube.Playlists.list("snippet", {mine: true});
  for(var i = 0; i < playlists.items.length; i++){
    if(playlists.items[i].id != channel.relatedPlaylists.favorites){
      currentBackupJson.playlists.push(FetchPlaylistItems(playlists.items[i].id, playlists.items[i].snippet.title));
    }
  }
  
  if(lastBackupJson){
    currentBackupJson = MergeBackups(lastBackupJson, currentBackupJson);
  }
  
  docFile.getBody().setText(JSON.stringify(currentBackupJson));
  docFile.saveAndClose();
  
  Logger.log('Request processed: backupYoutubeListsV2');
}

function FetchPlaylistItems(playlistId, playlistName){
  var items = [];
  var nextPageToken;
  do {
    var playlistResponse = YouTube.PlaylistItems.list('snippet', {
      playlistId: playlistId,
      maxResults: 50,
      pageToken: nextPageToken
    });

    for (var j = 0; j < playlistResponse.items.length; j++) {
      var playlistItem = playlistResponse.items[j];
      items.push({id: playlistItem.snippet.resourceId.videoId.toString(), title: playlistItem.snippet.title});
    }
    nextPageToken = playlistResponse.nextPageToken;
  } while (nextPageToken != null);
  return {id: playlistId, name: playlistName, items:items};
}

function MergeBackups(lastBackupJson, currentBackupJson){
  var deletedVideos = [];
  var privateVideos = [];
  var notificationText = "";
  for(var i = 0; i < currentBackupJson.playlists.length; i++){
    var currentBackupPlaylist = currentBackupJson.playlists[i];
    var lastBackupPlaylist;
    for(var j = 0; j < lastBackupJson.playlists.length; j++){
      if(lastBackupJson.playlists[j].id == currentBackupPlaylist.id){
        lastBackupPlaylist = lastBackupJson.playlists[j];
        break;
      }
    }
    if(lastBackupPlaylist){
      for(var k = 0; k < currentBackupPlaylist.items.length; k++){
        var currentBackupItem = currentBackupPlaylist.items[k];
        if(currentBackupItem.title == "Deleted video"){
          deletedVideos.push(currentBackupItem);
        }
        if(currentBackupItem.title == "Private video"){
          privateVideos.push(currentBackupItem);
        }
        var lastBackupItem;
        for(var l = 0; l < lastBackupPlaylist.items.length; l++){
          if(lastBackupPlaylist.items[l].id == currentBackupItem.id){
            lastBackupItem = lastBackupPlaylist.items[l];
            if(currentBackupItem.title != lastBackupItem.title){
              notificationText += "Playlist: " + currentBackupPlaylist.name + ". Name: " + lastBackupItem.title + " > " + currentBackupItem.title + ". [http://www.youtube.com/watch?v=" + currentBackupItem.id + "]<br />";
            }
            break;
          }
        }
      }
    }
  }
  if(notificationText.length == 0){
    notificationText = "Nothing Has Changed";
  }
  if(deletedVideos.length > 0){
    notificationText += "<br /><br />These videos are seems to be deleted:";
    for(var i = 0; i < deletedVideos.length; i++){
      notificationText += "<br />Name: " + deletedVideos[i].title + ". [http://www.youtube.com/watch?v=" + deletedVideos[i].id + "]";
    }
  }
  if(privateVideos.length > 0){
    notificationText += "<br /><br />These videos are seems to be private:";
    for(var i = 0; i < privateVideos.length; i++){
      notificationText += "<br />Name: " + privateVideos[i].title + ". [http://www.youtube.com/watch?v=" + privateVideos[i].id + "]";
    }
  }
  GmailApp.sendEmail(Session.getActiveUser().getEmail(), "Youtube Playlist Changes", notificationText, {htmlBody: notificationText});
  return currentBackupJson;
}