public async Task <ActionResult> Delete(int?id, string errorMessage = null)
{
// validate song id
if (id == null)
{
return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
}
// fetch song from the database
Song song = await _databaseGateway.Songs.GetAsync(id.Value);
if (song == null)
{
return(HttpNotFound());
}
// check authorization
if (!IsUserAuthorized(song, AuthorizationActivity.Delete))
{
return(new HttpStatusCodeResult(HttpStatusCode.Unauthorized));
}
// build a DTO view model of the song for the view to render
SongViewModel songViewModel = new SongViewModel(song);
// add edit authorization data
songViewModel.IsUserAuthorizedToDelete = true;
songViewModel.IsUserAuthorizedToEdit = IsUserAuthorized(song, AuthorizationActivity.Update);
// try reading the chords & midi files and adding their content to the view model
string chordsFilePath = await GetSongPath(song.Id, SongFileType.ChordProgressionFile);
string midiFilePath = await GetSongPath(song.Id, SongFileType.MidiOriginalFile);
try
{
songViewModel.ChordProgression = System.IO.File.ReadAllText(chordsFilePath);
songViewModel.MidiData = CompositionContext.ReadMidiFile(midiFilePath);
}
catch (Exception ex)
{
// failed to read chord/midi data. log the error
HomeController.WriteErrorToLog(HttpContext, ex.Message);
}
finally
{
// release unmanaged open resources
songViewModel.MidiData?.Stream?.Dispose();
}
// if an error message is present, save it for the view to render
ViewBag.ErrorMessage = errorMessage;
// pass the view model to the view to render
return(View(songViewModel));
}
public static bool IsMidiFileValid(HttpPostedFileBase midiFileHandler, out IMidiFile midiFile, out string errorMessage)
{
errorMessage = null;
try
{ // fetch midi content from stream
midiFile = CompositionContext.ReadMidiFile(midiFileHandler.InputStream);
return(true);
}
catch (Exception ex)
{
midiFile = null;
errorMessage = ex.Message;
return(false);
}
}