Move source code into "Source" folder

Source/FileLiberator/AudioFileStorageExt.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using DataLayer;
+using Dinah.Core;
+using FileManager;
+using LibationFileManager;
+
+namespace FileLiberator
+{
+    public static class AudioFileStorageExt
+    {
+        private class MultipartRenamer
+        {
+            private LibraryBook libraryBook { get; }
+
+            internal MultipartRenamer(LibraryBook libraryBook) => this.libraryBook = libraryBook;
+
+            internal string MultipartFilename(AaxDecrypter.MultiConvertFileProperties props)
+                => Templates.ChapterFile.GetFilename(libraryBook.ToDto(), props);
+        }
+
+        public static Func<AaxDecrypter.MultiConvertFileProperties, string> CreateMultipartRenamerFunc(this AudioFileStorage _, LibraryBook libraryBook)
+            => new MultipartRenamer(libraryBook).MultipartFilename;
+
+        /// <summary>
+        /// DownloadDecryptBook:
+        /// File path for where to move files into.
+        /// Path: directory nested inside of Books directory
+        /// File name: n/a
+        /// </summary>
+        public static string GetDestinationDirectory(this AudioFileStorage _, LibraryBook libraryBook)
+            => Templates.Folder.GetFilename(libraryBook.ToDto());
+
+        /// <summary>
+        /// DownloadDecryptBook:
+        /// Path: in progress directory.
+        /// File name: final file name.
+        /// </summary>
+        public static string GetInProgressFilename(this AudioFileStorage _, LibraryBook libraryBook, string extension)
+            => Templates.File.GetFilename(libraryBook.ToDto(), AudibleFileStorage.DecryptInProgressDirectory, extension, returnFirstExisting: true);
+
+        /// <summary>
+        /// PDF: audio file does not exist
+        /// </summary>
+        public static string GetBooksDirectoryFilename(this AudioFileStorage _, LibraryBook libraryBook, string extension)
+            => Templates.File.GetFilename(libraryBook.ToDto(), AudibleFileStorage.BooksDirectory, extension);
+
+        /// <summary>
+        /// PDF: audio file already exists
+        /// </summary>
+        public static string GetCustomDirFilename(this AudioFileStorage _, LibraryBook libraryBook, string dirFullPath, string extension)
+            => Templates.File.GetFilename(libraryBook.ToDto(), dirFullPath, extension);
+    }
+}