Validate that folders in paths don't start or end with a space

(cherry picked from commit 316b5cbf75b45ef9a25f96ce1f2fbed25ad94296)

src/NzbDrone.Common.Test/PathExtensionFixture.cs

@@ -3,6 +3,7 @@ using System.IO;
 using FluentAssertions;
 using Moq;
 using NUnit.Framework;
+using NzbDrone.Common.Disk;
 using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Extensions;
 using NzbDrone.Test.Common;
@@ -34,7 +35,7 @@ namespace NzbDrone.Common.Test
         [TestCase(@"\\Testserver\\Test\", @"\\Testserver\Test")]
         [TestCase(@"\\Testserver\Test\file.ext", @"\\Testserver\Test\file.ext")]
         [TestCase(@"\\Testserver\Test\file.ext\\", @"\\Testserver\Test\file.ext")]
-        [TestCase(@"\\Testserver\Test\file.ext   \\", @"\\Testserver\Test\file.ext")]
+        [TestCase(@"\\Testserver\Test\file.ext   ", @"\\Testserver\Test\file.ext")]
         [TestCase(@"//CAPITAL//lower// ", @"\\CAPITAL\lower")]
         public void Clean_Path_Windows(string dirty, string clean)
         {
@@ -315,5 +316,30 @@ namespace NzbDrone.Common.Test
             result[2].Should().Be(@"TV");
             result[3].Should().Be(@"Series Title");
         }
+
+        [TestCase(@"C:\Test\")]
+        [TestCase(@"C:\Test")]
+        [TestCase(@"C:\Test\TV\")]
+        [TestCase(@"C:\Test\TV")]
+        public void IsPathValid_should_be_true(string path)
+        {
+            path.AsOsAgnostic().IsPathValid(PathValidationType.CurrentOs).Should().BeTrue();
+        }
+
+        [TestCase(@"C:\Test \")]
+        [TestCase(@"C:\Test ")]
+        [TestCase(@"C:\ Test\")]
+        [TestCase(@"C:\ Test")]
+        [TestCase(@"C:\Test \TV")]
+        [TestCase(@"C:\ Test\TV")]
+        [TestCase(@"C:\Test \TV\")]
+        [TestCase(@"C:\ Test\TV\")]
+        [TestCase(@" C:\Test\TV\")]
+        [TestCase(@" C:\Test\TV")]
+
+        public void IsPathValid_should_be_false(string path)
+        {
+            path.AsOsAgnostic().IsPathValid(PathValidationType.CurrentOs).Should().BeFalse();
+        }
     }
 }

src/NzbDrone.Common/Extensions/PathExtensions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Text.RegularExpressions;
 using NzbDrone.Common.Disk;
 using NzbDrone.Common.EnsureThat;
@@ -28,6 +29,12 @@ namespace NzbDrone.Common.Extensions
 
         public static string CleanFilePath(this string path)
         {
+            if (path.IsNotNullOrWhiteSpace())
+            {
+                // Trim trailing spaces before checking if the path is valid so validation doesn't fail for something we can fix.
+                path = path.TrimEnd(' ');
+            }
+
             Ensure.That(path, () => path).IsNotNullOrWhiteSpace();
             Ensure.That(path, () => path).IsValidPath(PathValidationType.AnyOs);
 
@@ -36,10 +43,10 @@ namespace NzbDrone.Common.Extensions
             // UNC
             if (!info.FullName.Contains('/') && info.FullName.StartsWith(@"\\"))
             {
-                return info.FullName.TrimEnd('/', '\\', ' ');
+                return info.FullName.TrimEnd('/', '\\');
             }
 
-            return info.FullName.TrimEnd('/').Trim('\\', ' ');
+            return info.FullName.TrimEnd('/').Trim('\\');
         }
 
         public static bool PathNotEquals(this string firstPath, string secondPath, StringComparison? comparison = null)
@@ -143,6 +150,23 @@ namespace NzbDrone.Common.Extensions
                 return false;
             }
 
+            if (path.Trim() != path)
+            {
+                return false;
+            }
+
+            var directoryInfo = new DirectoryInfo(path);
+
+            while (directoryInfo != null)
+            {
+                if (directoryInfo.Name.Trim() != directoryInfo.Name)
+                {
+                    return false;
+                }
+
+                directoryInfo = directoryInfo.Parent;
+            }
+
             if (validationType == PathValidationType.AnyOs)
             {
                 return IsPathValidForWindows(path) || IsPathValidForNonWindows(path);
@@ -253,6 +277,11 @@ namespace NzbDrone.Common.Extensions
             return processName;
         }
 
+        public static string CleanPath(this string path)
+        {
+            return Path.Join(path.Split(Path.DirectorySeparatorChar).Select(s => s.Trim()).ToArray());
+        }
+
         public static string GetAppDataPath(this IAppFolderInfo appFolderInfo)
         {
             return appFolderInfo.AppDataFolder;