Fixing that renaming Media Library files to a reserved Windows name should cause an error, fixes #6802

src/Orchard.Web/Modules/Orchard.MediaLibrary/MediaFileName/MediaFileNameDriver.cs

@@ -6,6 +6,7 @@
 using Orchard.MediaLibrary.Services;
 using Orchard.Security;
 using Orchard.UI.Notify;
+using Orchard.Validation;
 
 namespace Orchard.MediaLibrary.MediaFileName
 {
@@ -61,9 +62,12 @@ protected override DriverResult Editor(MediaPart part, IUpdateModel updater, dyn
                                 try {
                                     _mediaLibraryService.RenameFile(part.FolderPath, priorFileName, model.FileName);
                                     part.FileName = model.FileName;
-                                    
+
                                     _notifier.Add(NotifyType.Information, T("File '{0}' was renamed to '{1}'", priorFileName, model.FileName));
                                 }
+                                catch (InvalidWindowsPathException) {
+                                    updater.AddModelError("MediaFileNameEditorSettings.FileName", T("Unable to rename file. Invalid Windows file path."));
+                                }
                                 catch (Exception) {
                                     updater.AddModelError("MediaFileNameEditorSettings.FileName", T("Unable to rename file"));
                                 }

src/Orchard/Validation/PathValidation.cs

@@ -1,11 +1,16 @@
 using System;
 using System.IO;
+using System.Runtime.Serialization;
+using System.Text.RegularExpressions;
+using NHibernate.Hql;
+using Orchard.Environment;
 
 namespace Orchard.Validation {
     /// <summary>
     /// Provides methods to validate paths.
     /// </summary>
     public static class PathValidation {
+
         /// <summary>
         /// Determines if a path lies within the base path boundaries.
         /// If not, an exception is thrown.
@@ -26,10 +31,22 @@ public static string ValidatePath(string basePath, string mappedPath) {
             }
 
             if (!valid) {
-                throw new ArgumentException("Invalid path");
+                if (System.Environment.OSVersion.Platform == PlatformID.Win32NT)
+                    throw new InvalidWindowsPathException("Invalid path");
+                else
+                    throw new ArgumentException("Invalid path");
             }
 
             return mappedPath;
         }
     }
+
+    /// <summary>
+    /// Thrown when an invalid path is encountered on a Windows platform.
+    /// </summary>
+    [Serializable]
+    public class InvalidWindowsPathException : ApplicationException {
+        public InvalidWindowsPathException(string message) : base(message) {
+        }
+    }
 }