[DONT MERGE] give a spec to input files

Yavsc.Abstract/FileSystem/FileSystemHelpers.cs

@@ -0,0 +1,30 @@
+using System.Linq;
+
+namespace Yavsc.Abstract.FileSystem
+{
+    public static class FileSystemHelpers
+    {
+        public static bool IsValidYavscPath(this string path)
+        {
+            if (path == null) return true;
+            foreach (var name in path.Split('/'))
+            {
+                if (!IsValidDirectoryName(name) || name.Equals("..") || name.Equals("."))
+                        return false;
+            }
+            if (path[path.Length]==FileSystemConstants.RemoteDirectorySeparator) return false;
+            return true;
+        }
+        public static bool IsValidDirectoryName(this string name)
+        {
+            return !name.Any(c => !FileSystemConstants.ValidFileNameChars.Contains(c));
+        }
+
+    }
+
+    public static  class FileSystemConstants
+    {
+        public const char RemoteDirectorySeparator = '/';
+        public static char[] ValidFileNameChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-=_~. ".ToCharArray();
+    }
+}

Yavsc.Abstract/FileSystem/UserDirectoryInfo.cs

@@ -0,0 +1,41 @@
+using System;
+using System.IO;
+using System.Linq;
+using Yavsc.Abstract.FileSystem;
+
+namespace Yavsc.ViewModels.UserFiles
+{
+    public class UserDirectoryInfo
+    {
+        public string UserName { get; private set; }
+        public string SubPath { get; private set; }
+        public RemoteFileInfo [] Files {
+            get; private set;
+        }
+        public string [] SubDirectories { 
+            get; private set;
+        }
+        private DirectoryInfo dInfo;
+        public UserDirectoryInfo(string userReposPath, string username, string path)
+        {
+            if (string.IsNullOrWhiteSpace(username))
+                throw new NotSupportedException("No user name, no user dir.");
+            UserName = username;
+            var finalPath =  username;
+            if (!string.IsNullOrWhiteSpace(path))
+                 finalPath += Path.DirectorySeparatorChar + path;
+            if (!finalPath.IsValidYavscPath())
+                throw new InvalidOperationException(
+                    $"File name contains invalid chars, using path {finalPath}");
+
+            dInfo = new DirectoryInfo(
+                userReposPath+FileSystemConstants.RemoteDirectorySeparator+finalPath);
+            if (!dInfo.Exists) dInfo.Create();
+            Files = dInfo.GetFiles().Select
+             ( entry => new RemoteFileInfo { Name = entry.Name, Size = entry.Length,
+             CreationTime = entry.CreationTime, LastModified = entry.LastWriteTime  }).ToArray();
+             SubDirectories = dInfo.GetDirectories().Select
+             ( d=> d.Name ).ToArray();
+        }
+    }
+}

Yavsc.Abstract/FileSystem/UserFileInfo.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace Yavsc.ViewModels
+{
+    public class RemoteFileInfo 
+    {
+        public string Name { get; set; }
+
+        public long Size { get; set; }
+
+        public DateTime CreationTime { get; set; }
+
+        public DateTime LastModified { get; set; }
+
+       
+    }
+
+}