Fix regression for missing libgdiplus (#1073)

* Fix regression for missing libgdiplus

Add back error handling for systems where libgdiplus is not available. Should fix #1065

* Create GdiPlusInterop.cs

* Update DiskProviderBase.cs

* Update ImageResizer.cs

* Delete GdiPlusInterop.cs

* Update NzbDrone.Core.csproj

* Update NzbDrone.Common.csproj

* Update DiskProviderBase.cs

* Update IDiskProvider.cs

* Update ImageResizer.cs

* Update DiskProviderBase.cs

* Update IDiskProvider.cs

* Update ImageResizer.cs

This is really ugly... :(

* Update ImageResizer.cs

Never written C# before

* Update ImageResizerFixture.cs

* Fix test

src/NzbDrone.Common/Disk/DiskProviderBase.cs

@@ -109,8 +109,27 @@ namespace NzbDrone.Common.Disk
             }
         }
         
+        public bool CanUseGDIPlus()
+        {
+            try
+            {
+                GdiPlusInterop.CheckGdiPlus();
+                return true;
+            }
+            catch (DllNotFoundException ex)
+            {
+                Logger.Trace(ex, "System does not have libgdiplus.");
+                return false;
+            }
+        }
+
         public bool IsValidGDIPlusImage(string filename)
         {
+            if (!CanUseGDIPlus())
+            {
+                return true;
+            }
+            
             try
             {
                 using (var bmp = new Bitmap(filename))
@@ -120,7 +139,7 @@ namespace NzbDrone.Common.Disk
             }
             catch (Exception ex)
             {
-                //_logger.Debug(ex, "Corrupted image found at: {0}. Redownloading...", filename);
+                Logger.Debug(ex, "Corrupted image found at: {0}.", filename);
                 return false;
             }
         }

src/NzbDrone.Common/Disk/GdiPlusInterop.cs

@@ -2,7 +2,7 @@
 using System.Drawing;
 using NzbDrone.Common.EnvironmentInfo;
 
-namespace NzbDrone.Core.MediaCover
+namespace NzbDrone.Common.Disk
 {
     public static class GdiPlusInterop
     {

src/NzbDrone.Common/Disk/IDiskProvider.cs

@@ -19,6 +19,7 @@ namespace NzbDrone.Common.Disk
         bool FolderExists(string path);
         bool FileExists(string path);
         bool FileExists(string path, StringComparison stringComparison);
+        bool CanUseGDIPlus();
         bool IsValidGDIPlusImage(string path);
         bool FolderWritable(string path);
         string[] GetDirectories(string path);

src/NzbDrone.Common/NzbDrone.Common.csproj

@@ -90,6 +90,7 @@
     <Compile Include="Disk\FileSystemModel.cs" />
     <Compile Include="Disk\FileSystemResult.cs" />
     <Compile Include="Extensions\DictionaryExtensions.cs" />
+    <Compile Include="Disk\GdiPlusInterop.cs" />
     <Compile Include="Disk\OsPath.cs" />
     <Compile Include="Disk\DiskProviderBase.cs" />
     <Compile Include="Disk\IDiskProvider.cs" />

src/NzbDrone.Core.Test/MediaCoverTests/ImageResizerFixture.cs

@@ -30,6 +30,10 @@ namespace NzbDrone.Core.Test.MediaCoverTests
             Mocker.GetMock<IDiskProvider>()
                   .Setup(v => v.DeleteFile(It.IsAny<string>()))
                   .Callback<string>(s => File.Delete(s));
+                  
+            Mocker.GetMock<IDiskProvider>()
+                  .Setup(v => v.CanUseGDIPlus())
+                  .Returns(true);
         }
 
         [Test]

src/NzbDrone.Core/MediaCover/ImageResizer.cs

@@ -1,4 +1,5 @@
 using ImageResizer;
+using System;
 using NzbDrone.Common.Disk;
 
 namespace NzbDrone.Core.MediaCover
@@ -21,7 +22,10 @@ namespace NzbDrone.Core.MediaCover
         {
             try
             {
-                GdiPlusInterop.CheckGdiPlus();
+                if (!_diskProvider.CanUseGDIPlus())
+                {
+                    throw new Exception("Can't resize without libgdiplus.");
+                }
 
                 using (var sourceStream = _diskProvider.OpenReadStream(source))
                 {

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -780,7 +780,6 @@
     <Compile Include="Lifecycle\Commands\ShutdownCommand.cs" />
     <Compile Include="Lifecycle\LifecycleService.cs" />
     <Compile Include="MediaCover\CoverAlreadyExistsSpecification.cs" />
-    <Compile Include="MediaCover\GdiPlusInterop.cs" />
     <Compile Include="MediaCover\MediaCover.cs" />
     <Compile Include="MediaCover\ImageResizer.cs" />
     <Compile Include="MediaCover\MediaCoverService.cs" />