refactoring fs

Yavsc/Helpers/FileSystemHelpers.cs

@@ -1,24 +1,36 @@
+
 using System.IO;
+using System.Linq;
+using System.Security.Claims;
 using Microsoft.AspNet.FileProviders;
-using Yavsc.Models.Billing;
+using Yavsc.ViewModels.UserFiles;
 
 namespace Yavsc.Helpers
 {
     public static class FileSystemHelpers {
-      public static IDirectoryContents GetFileContent(this Estimate estimate, string userFileDir)
-        {
-            if (estimate?.Query?.PerformerProfile?.Performer == null)
-                return null;
-            var di = new DirectoryInfo(Path.Combine(
-                    userFileDir,
-                    estimate.Query.PerformerProfile.Performer.UserName
-               ));
-            if (!di.Exists) return null;
 
-            var fsp = new PhysicalFileProvider(di.FullName);
-            return fsp.GetDirectoryContents(
-                Path.Combine(Constants.UserBillsFilesDir, estimate.Id.ToString())
-                );
+        public static UserDirectoryInfo GetUserFiles(this ClaimsPrincipal user,string subdir) {
+            
+            UserDirectoryInfo di = new UserDirectoryInfo(user.Identity.Name,subdir);
+           
+            return di;
+        }
+        static char [] ValidChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_~.".ToCharArray();
+
+        public static bool IsValidDirectoryName(this string name)
+        { 
+            return !name.Any(c=> !ValidChars.Contains(c));
+        }
+        public static bool IsValidPath(this string path)
+        { 
+            if (path==null) return true;
+            foreach (var name in path.Split(Path.DirectorySeparatorChar))
+                {
+                    if (name!=null)
+                    if (!IsValidDirectoryName(name)
+                     || name.Equals("..")) return false;
+                }
+            return true;
         }
     }