add necessary modules to new zero

zero/FileStorage/IFileSystem.cs

@@ -0,0 +1,71 @@
+using System.IO;
+
+namespace zero.FileStorage;
+
+public interface IFileSystem
+{
+  /// <summary>
+  /// Map a relative path to an absolute internal path 
+  /// </summary>
+  string Map(string path);
+
+  /// <summary>
+  /// Map an internal path to a public accessible path
+  /// </summary>
+  string MapToPublicPath(string path);
+
+  /// <summary>
+  /// Determines whether a file or directory at the given path already exists
+  /// </summary>
+  Task<bool> Exists(string path, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Get information of a file
+  /// </summary>
+  Task<IFileMeta> GetFileInfo(string path, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Returns a readable stream for a file
+  /// </summary>
+  Task<Stream> StreamFile(string path, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Creates a file at the given path
+  /// </summary>
+  Task CreateFile(string path, Stream fileStream, bool overwrite = false, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Deletes a file at the given path. This method returns if the file does not exist.
+  /// </summary>
+  Task DeleteFile(string path, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Moves a file to another path (can also be used to rename resources)
+  /// </summary>
+  Task MoveFile(string oldPath, string newPath, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Copies a file to another path
+  /// </summary>
+  Task CopyFile(string oldPath, string newPath, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Get information of a directory
+  /// </summary>
+  Task<IFileMeta> GetDirectoryInfo(string path, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Get all items within a directory
+  /// </summary>
+  IAsyncEnumerable<IFileMeta> GetDirectoryContent(string path = null, bool recursive = false, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Tries to create a directory at the given path. This method returns if the directory already exists.
+  /// </summary>
+  Task CreateDirectory(string path, CancellationToken cancellationToken = default);
+
+  /// <summary>
+  /// Deletes a directory at the given path. This method returns if the directory does not exist.
+  /// </summary>
+  Task DeleteDirectory(string path, bool recursive = false, CancellationToken cancellationToken = default);
+}