diff --git a/src/Yavsc/Services/IFileSystemAuthManager.cs b/src/Yavsc/Services/IFileSystemAuthManager.cs
new file mode 100644
index 00000000..9e13294e
--- /dev/null
+++ b/src/Yavsc/Services/IFileSystemAuthManager.cs
@@ -0,0 +1,55 @@
+using System;
+using System.Security.Principal;
+using Yavsc.Models;
+
+namespace Yavsc.Services {
+    [Flags]
+    public enum FileAccessRight {
+        None = 0,
+
+        Read = 1,
+        Write = 2
+    }
+
+    public interface IFileSystemAuthManager {
+        string NormalizePath (string path);
+
+        /// <summary>
+        /// A full path starts with a slash,
+        /// continues with a user name,
+        /// and returns true by the helper fonction : 
+        /// </summary>
+        /// <param name="user"></param>
+        /// <param name="normalizedFullPath"></param>
+        /// <returns></returns>
+        FileAccessRight GetFilePathAccess(IPrincipal user, string normalizedFullPath);
+
+        void SetAccess (long circleId, string normalizedFullPath, FileAccessRight access);
+
+    }
+
+    public class FileSystemAuthManager : IFileSystemAuthManager
+    {
+        ApplicationDbContext _dbContext;
+
+        public FileSystemAuthManager(ApplicationDbContext dbContext)
+        {
+            _dbContext = dbContext;
+        }
+
+        public FileAccessRight GetFilePathAccess(IPrincipal user, string normalizedFullPath)
+        {
+            throw new NotImplementedException();
+        }
+
+        public string NormalizePath(string path)
+        {
+            throw new NotImplementedException();
+        }
+
+        public void SetAccess(long circleId, string normalizedFullPath, FileAccessRight access)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
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