Add support for locating mp3 audiobooks

Source/LibationFileManager/AudibleFileStorage.cs

@@ -8,6 +8,7 @@ using Dinah.Core;
 using System.Threading.Tasks;
 using System.Threading;
 using FileManager;
+using AaxDecrypter;
 
 #nullable enable
 namespace LibationFileManager
@@ -113,7 +114,7 @@ namespace LibationFileManager
 		{
 			RecurseSubdirectories = true,
 			IgnoreInaccessible = true,
-			MatchCasing = MatchCasing.CaseInsensitive
+			AttributesToSkip = FileAttributes.Hidden,
 		};
 
 		protected override LongPath? GetFilePathCustom(string productId)
@@ -157,22 +158,40 @@ namespace LibationFileManager
 		{
 			ArgumentValidator.EnsureNotNull(searchDirectory, nameof(searchDirectory));
 
-			foreach (LongPath path in Directory.EnumerateFiles(searchDirectory, "*.M4B", enumerationOptions))
+			foreach (LongPath path in Directory.EnumerateFiles(searchDirectory, "*.*", enumerationOptions))
 			{
 				if (cancellationToken.IsCancellationRequested)
 					yield break;
 
+				if (getFormatByExtension(path) is not OutputFormat format)
+					continue;
+
 				FilePathCache.CacheEntry? audioFile = default;
 
 				try
 				{
 					using var fileStream = File.OpenRead(path);
 
+					if (format is OutputFormat.M4b)
+					{
 						var mp4File = await Task.Run(() => new AAXClean.Mp4File(fileStream), cancellationToken);
 
 						if (mp4File?.AppleTags?.Asin is not null)
 							audioFile = new FilePathCache.CacheEntry(mp4File.AppleTags.Asin, FileType.Audio, path);
+					}
+					else
+					{
+						var id3 = NAudio.Lame.ID3.Id3Tag.Create(fileStream);
 
+						var asin
+							= id3?.Children
+							.OfType<NAudio.Lame.ID3.TXXXFrame>()
+							.FirstOrDefault(f => f.FieldName == "AUDIBLE_ASIN")
+							?.FieldValue;
+
+						if (!string.IsNullOrWhiteSpace(asin))
+							audioFile = new FilePathCache.CacheEntry(asin, FileType.Audio, path);
+					}
 				}
 				catch (Exception ex)
 				{
@@ -186,6 +205,15 @@ namespace LibationFileManager
 				if (audioFile is not null)
 					yield return audioFile;
 			}
+
+			static OutputFormat? getFormatByExtension(string path)
+			{
+				var ext = Path.GetExtension(path).ToLower();
+
+				return ext == ".mp3" ? OutputFormat.Mp3
+					: ext == ".m4b" ? OutputFormat.M4b
+					: null;
+			}
 		}
 	}
 }