public static void UpdateTrackFromLastFm(Track track)
{
try
{
// load recent tracks from last.fm
XElement playedTrack = XElement.Load("http://ws.audioscrobbler.com/2.0/?method=track.getInfo&artist=" + System.Web.HttpUtility.UrlEncode(track.Artist) + "&track=" + System.Web.HttpUtility.UrlEncode(track.TrackName) + "&api_key=" + ConfigurationManager.AppSettings["e3RadioLastFmApiKey"]);
// Update track info
track.LastFmLink = (string)playedTrack.Element("url");
foreach (var image in playedTrack.Elements("image"))
{
switch ((string)image.Attribute("size"))
{
case "small": track.PictureSmall = (string)image; break;
case "medium": track.PictureMedium = (string)image; break;
case "large": track.PictureLarge = (string)image; break;
case "extralarge": track.PictureExtraLarge = (string)image; break;
}
}
track.DateUpdated = DateTime.Now;
track.Album = (string)playedTrack.Element("album").Element("title");
}
catch
{
//e.g. track not found on last fm
}
}
/// <summary>
/// Attempts to load track details from spotify uri
/// </summary>
/// <param name="track"></param>
public static bool LookupTrackInfo(Track track)
{
try
{
// search for track using Spotify metadata API and get spotify URI
System.Xml.Linq.XNamespace ns = "http://www.spotify.com/ns/music/1";
XElement data = XElement.Load("http://ws.spotify.com/lookup/1/?uri=" + System.Web.HttpUtility.UrlEncode(track.SpotifyUri));
track.TrackName = (string)data.Element(ns + "name");
track.Artist = (string)data.Element(ns + "artist").Element(ns + "name");
if (data.Element(ns + "album") != null)
{
track.Album = (string)data.Element(ns + "album").Element(ns + "name");
}
track.Length = (int?)data.Element(ns + "length");
return true;
}
catch
{
// prolly rate limited
return false;
}
}
/// <summary>
/// Find a Track from it's Spotify URI.
/// If it isn't in the DB we will load it's details and create it.
/// </summary>
/// <param name="db"></param>
/// <param name="reqUri"></param>
/// <returns></returns>
public static Track GetOrCreateTrackBySpotifyUri(E3RadioEntities db, string reqUri)
{
// find existing track, if it has been played before
var track = db.Tracks.FirstOrDefault(t => t.SpotifyUri == reqUri);
if (track == null)
{
// Track is not in the database, load info from spotify/last.fm
track = new Track()
{
SpotifyUri = reqUri,
Likes = 0,
Dislikes = 0,
DateAdded = DateTime.Now
};
// look up track info from spotify or die
if (!LookupTrackInfo(track)) return null;
// update additional track info (cover art) from last.fm
LastFM.UpdateTrackFromLastFm(track);
db.Tracks.Add(track);
}
else // Track is already in the database.
{
// Update fields we recently added from Spotify
if (!track.Length.HasValue)
LookupTrackInfo(track);
// Try to get cover art if not set
if (track.PictureSmall == null)
LastFM.UpdateTrackFromLastFm(track);
}
return track;
}
/// <summary>
/// Format an individual track into a list of anonymous types
/// ready to be serialised.
/// </summary>
/// <param name="track"></param>
/// <returns></returns>
public static object FormatTrack(Track track)
{
// Convert track into IQueryable so we can format it
var tracks = new List<Data.Track>() { track }.AsQueryable();
return FormatTracks(tracks);
}