public static async Task<Episode> DownloadPodcastEpisodeAsync(Episode episode, Action<DownloadOperation> callback, Action errorCallback = null)
{
var appFolder = await KnownFolders.MusicLibrary.CreateFolderAsync("PodcastR", CreationCollisionOption.OpenIfExists);
var podcastFolder = await appFolder.CreateFolderAsync(episode.Podcast.Name, CreationCollisionOption.OpenIfExists);
try
{
var uri = new Uri(episode.WebPath);
var extension = uri.AbsolutePath.GetExtension();
var fileName = (episode.Name + extension).RemoveIllegalPathChars().Replace(":", "");
var episodeFile = await podcastFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
var backgroundDownloader = new BackgroundDownloader();
var downloadOperation = backgroundDownloader.CreateDownload(uri, episodeFile);
var progress = new Progress<DownloadOperation>(callback);
downloads.Add(episode, downloadOperation);
var cts = new CancellationTokenSource();
cancellationTokenSources.Add(episode, cts);
await downloadOperation.StartAsync().AsTask(cts.Token, progress);
downloads.Remove(episode);
cancellationTokenSources.Remove(episode);
episode.IsLocal = true;
episode.WebPath = episodeFile.Path;
return episode;
}
catch
{
if (errorCallback != null)
errorCallback();
return episode;
}
}
public static async Task<IList<Episode>> CheckForNewEpisodes(IEnumerable<Podcast> podcasts)
{
var result = new List<Episode>();
foreach (var podcast in podcasts.ToList())
{
try
{
var httpClient = new HttpClient();
var xml = await httpClient.GetStringAsync(podcast.FeedUrl);
var xmlDocument = XDocument.Parse(xml);
var elements = xmlDocument.Element("rss").Element("channel").Elements("item");
foreach (var element in elements)
{
var episode = new Episode(element, podcast);
if (!podcast.Episodes.Any(e => string.Compare(e.Name, episode.Name) == 0))
{
podcast.Episodes.Insert(0, episode);
result.Add(episode);
}
}
}
catch
{
}
}
return result.OrderBy(e => e.Published).ToList();
}
public EpisodeViewModel(Episode episode)
{
this.Episode = episode;
this.IsLocal = episode.IsLocal;
this.ToggleEpisodeLocationCommand = new SymbolCommand(new GalaSoft.MvvmLight.Command.RelayCommand(async () => await this.ToggleEpisodeLocationAsync()), this.IsLocal ? Symbol.Delete : Symbol.Download, this.IsLocal ? "Delete" : "Download");
this.PlayCommand = new SymbolCommand(new GalaSoft.MvvmLight.Command.RelayCommand(() => this.Play()), Symbol.Play, "Play");
}
public static void CancelDownload(Episode episode)
{
var cancellationTokenSource = cancellationTokenSources[episode];
cancellationTokenSource.Cancel();
cancellationTokenSource.Dispose();
cancellationTokenSources.Remove(episode);
downloads.Remove(episode);
}
public static void ResumeDownload(Episode episode)
{
var downloadOperation = downloads[episode];
if (downloadOperation.Progress.Status == BackgroundTransferStatus.PausedByApplication)
{
downloadOperation.Resume();
}
}
public static void PauseDownload(Episode episode)
{
var downloadOperation = downloads[episode];
if (downloadOperation.Progress.Status == BackgroundTransferStatus.Running)
{
downloadOperation.Pause();
}
}
public static async Task DeletePodcastEpisodeAsync(Episode episode)
{
var file = await StorageFile.GetFileFromPathAsync(episode.WebPath);
await file.DeleteAsync();
episode.WebPath = episode.WebPath;
episode.IsLocal = false; ;
}
public static void UpdateSystemControls(Episode episode)
{
if (systemControls != null)
{
systemControls.DisplayUpdater.Thumbnail = RandomAccessStreamReference.CreateFromUri(episode.ImageUrl);
systemControls.DisplayUpdater.MusicProperties.AlbumArtist = episode.Podcast.Name;
systemControls.DisplayUpdater.MusicProperties.Artist = episode.Author;
systemControls.DisplayUpdater.MusicProperties.Title = episode.Name;
systemControls.DisplayUpdater.Update();
systemControls.PlaybackStatus = MediaPlaybackStatus.Playing;
}
}
public static async Task<Podcast> LoadPodcastAsync(Uri url)
{
try
{
var httpClient = new HttpClient();
var xml = await httpClient.GetStringAsync(url);
var xmlDocument = XDocument.Parse(xml);
var channelTitle = xmlDocument.Element("rss").Element("channel").Element("title").Value;
XNamespace itunes = "http://www.itunes.com/dtds/podcast-1.0.dtd";
var elements = xmlDocument.Element("rss").Element("channel").Elements("item");
var description = xmlDocument.Element("rss").Element("channel").Element("description").Value;
var imageUrl = xmlDocument.Element("rss").Element("channel").Element(itunes + "image").Attribute("href").Value;
var author = xmlDocument.Element("rss").Element("channel").Element(itunes + "author").Value;
var podcast = new Podcast
{
FeedUrl = url,
Name = channelTitle,
ImageUrl = new Uri(imageUrl),
Author = author,
Description = description,
DateAdded = DateTime.Now
};
var episodes = new List<Episode>();
foreach (var element in elements)
{
var episode = new Episode(element, podcast);
episodes.Add(episode);
}
podcast.Episodes = episodes.OrderByDescending(episode => episode.Published).ToList();
return podcast;
}
catch
{
return null;
}
}
