playlist_updates.js

// Bunch of javascript from the YouTubes API sample code which allows me to grab all my daily 
// subsciption videos and insert them into a single playlist for easy listening. 
// Currently I would have to open each song into a tab and listen to them one by one. Now I can
// just hit 'Play All' on the playlist and listen to all the new posts.

// Define some variables used to remember state.
var playlistId = 'PLyDoEZ08Zam3n_bPBi2ylc_NZV--spj5_';
var channelId;
var playlistArray = [];

// After the API loads, call a function to enable the playlist creation form.
function handleAPILoaded() {
  enableForm();
}

// Enable the form for creating a playlist.
function enableForm() {
  $('#playlist-button').attr('disabled', false);
}

function updatePlaylist() {
  parsePlaylist();
  parseSubscription();
}

// Iterates through the videos on "My Subscription" page and compares them against the playlist.
// If the video exists in both lists it returns true, otherwise it returns false. 
function checkForDuplicates(playlistVideos, video) {
  if (playlistVideos.indexOf(video) > -1) {
    return true; 
  } else {
    return false;
  }
}

// Parse all the video IDs from the daily s so that we can check for duplicates
function parsePlaylist() {
    $.getJSON('https://gdata.youtube.com/feeds/api/playlists/PLyDoEZ08Zam3n_bPBi2ylc_NZV--spj5_/?v=2&alt=json&format=5', function(data) {
       var feed = data.feed;
       var entries = feed.entry || [];
       var urlIds = [];
       for (var i = 0; i < entries.length; i++) {
         var entry = entries[i];
         urlIds.push(entry['media$group']['yt$videoid']['$t']); 
       }

      playlistArray = urlIds;
   });
}

// Sleep function to rate limit how quickly we add vidoes to the playlist.
// Calls the checkforDuplicate function and if the video doesn't exist in the playlist
// it called the addToPlaylist function with the video idea as the argument.
function callback(id) {
    var ID = id;
    return function() { 
        if (checkForDuplicates(playlistArray, id)) {
          return true;
        } else {
          addToPlaylist(id);
        }
    }
}

// Parse the subscription feed so that we only grab the video IDs. 
function parseSubscription() {
   $.getJSON('https://gdata.youtube.com/feeds/api/users/sofakingeuro/newsubscriptionvideos?v=2&alt=json&format=5', function(data) {
      var feed = data.feed;
      var entries = feed.entry || [];
      var urlIds = [];
       for (var i = 0; i < entries.length; i++) {
         var entry = entries[i];
         var title = entry.title.$t;
         var id = entry.id.$t;
         var sanitizedId = id.replace('tag:youtube.com,2008:video:', '');
         urlIds.push(sanitizedId);
       }
      
       for (var x = 0; x < urlIds.length; x++) {
         setTimeout( callback(urlIds[x]), 1000 * x);
       }
    });
}

// Add a video ID specified in the form to the playlist.
function addVideoToPlaylist(id) {
  addToPlaylist(id.val());
}

// Add a video to a playlist. The "startPos" and "endPos" values let you
// start and stop the video at specific times when the video is played as
// part of the playlist. However, these values are not set in this example.
function addToPlaylist(id, startPos, endPos) {
  var details = {
    videoId: id,
    kind: 'youtube#video'
  }
  if (startPos != undefined) {
    details['startAt'] = startPos;
  }
  if (endPos != undefined) {
    details['endAt'] = endPos;
  }
  var request = gapi.client.youtube.playlistItems.insert({
    part: 'snippet',
    resource: {
      snippet: {
        playlistId: playlistId,
        resourceId: details
      }
    }
  });
  request.execute(function(response) {
    $('#status').html('<pre>' + JSON.stringify(response.result) + '</pre>');
  });
}