Extensions are not enabled any more if they can't actually be loaded, fixes #2437

src/Orchard.Tests.Modules/Migrations/SchemaCommandGeneratorTests.cs

@@ -194,6 +194,10 @@ Features:
                 throw new NotImplementedException();
             }
 
+            public bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+                throw new NotImplementedException();
+            }
+
             #endregion
         }
 

src/Orchard.Tests/Environment/Extensions/ExtensionLoaderCoordinatorTests.cs

@@ -114,6 +114,10 @@ namespace Orchard.Tests.Environment.Extensions {
                 throw new NotImplementedException();
             }
 
+            public bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+                throw new NotImplementedException();
+            }
+
             #endregion
         }
 

src/Orchard.Tests/Environment/Extensions/ExtensionManagerTests.cs

@@ -119,6 +119,10 @@ namespace Orchard.Tests.Environment.Extensions {
                 throw new NotImplementedException();
             }
 
+            public bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+                throw new NotImplementedException();
+            }
+
             #endregion
         }
 

src/Orchard.Web/Modules/Orchard.Modules/Controllers/AdminController.cs

@@ -46,8 +46,7 @@ namespace Orchard.Modules.Controllers {
             IRecipeManager recipeManager,
             ShellDescriptor shellDescriptor,
             ShellSettings shellSettings,
-            IShapeFactory shapeFactory)
-        {
+            IShapeFactory shapeFactory) {
             Services = services;
             _extensionDisplayEventHandler = extensionDisplayEventHandlers.FirstOrDefault();
             _moduleService = moduleService;
@@ -158,7 +157,7 @@ namespace Orchard.Modules.Controllers {
             try {
                 _recipeManager.Execute(recipe);
             }
-            catch(Exception e) {
+            catch (Exception e) {
                 Logger.Error(e, "Error while executing recipe {0} in {1}", moduleId, name);
                 Services.Notifier.Error(T("Recipes {0} contains  unsupported module installation steps.", recipe.Name));
             }
@@ -177,12 +176,12 @@ namespace Orchard.Modules.Controllers {
             IEnumerable<ModuleFeature> features = _featureManager.GetAvailableFeatures()
                 .Where(f => !DefaultExtensionTypes.IsTheme(f.Extension.ExtensionType))
                 .Select(f => new ModuleFeature {
-                                Descriptor = f,
-                                IsEnabled = _shellDescriptor.Features.Any(sf => sf.Name == f.Id),
-                                IsRecentlyInstalled = _moduleService.IsRecentlyInstalled(f.Extension),
-                                NeedsUpdate = featuresThatNeedUpdate.Contains(f.Id),
-                                DependentFeatures = _moduleService.GetDependentFeatures(f.Id).Where(x => x.Id != f.Id).ToList()
-                            })
+                    Descriptor = f,
+                    IsEnabled = _shellDescriptor.Features.Any(sf => sf.Name == f.Id),
+                    IsRecentlyInstalled = _moduleService.IsRecentlyInstalled(f.Extension),
+                    NeedsUpdate = featuresThatNeedUpdate.Contains(f.Id),
+                    DependentFeatures = _moduleService.GetDependentFeatures(f.Id).Where(x => x.Id != f.Id).ToList()
+                })
                 .ToList();
 
             return View(new FeaturesViewModel {
@@ -212,13 +211,13 @@ namespace Orchard.Modules.Controllers {
                     case FeaturesBulkAction.None:
                         break;
                     case FeaturesBulkAction.Enable:
-                        _moduleService.EnableFeatures(disabledFeatures, force == true);
+                        EnableFeatures(disabledFeatures, force == true);
                         break;
                     case FeaturesBulkAction.Disable:
                         _moduleService.DisableFeatures(enabledFeatures, force == true);
                         break;
                     case FeaturesBulkAction.Toggle:
-                        _moduleService.EnableFeatures(disabledFeatures, force == true);
+                        EnableFeatures(disabledFeatures, force == true);
                         _moduleService.DisableFeatures(enabledFeatures, force == true);
                         break;
                     case FeaturesBulkAction.Update:
@@ -250,5 +249,16 @@ namespace Orchard.Modules.Controllers {
         private bool ExtensionIsAllowed(ExtensionDescriptor extensionDescriptor) {
             return _shellSettings.Modules.Length == 0 || _shellSettings.Modules.Contains(extensionDescriptor.Id);
         }
+
+        private void EnableFeatures(List<string> disabledFeatures, bool force) {
+            foreach (var feature in disabledFeatures) {
+                if (_featureManager.HasLoader(feature)) {
+                    _moduleService.EnableFeatures(disabledFeatures, force);
+                }
+                else {
+                    Services.Notifier.Error(T("No loader found for feature's (\"{0}\") exension!", feature));
+                }
+            }
+        }
     }
 }

src/Orchard/Environment/Extensions/Loaders/CoreExtensionLoader.cs

@@ -11,10 +11,12 @@ namespace Orchard.Environment.Extensions.Loaders {
     public class CoreExtensionLoader : ExtensionLoaderBase {
         private const string CoreAssemblyName = "Orchard.Core";
         private readonly IAssemblyLoader _assemblyLoader;
+        private readonly IDependenciesFolder _dependenciesFolder;
 
-        public CoreExtensionLoader(IDependenciesFolder dependenciesFolder, IAssemblyLoader assemblyLoader)
+        public CoreExtensionLoader(IAssemblyLoader assemblyLoader, IDependenciesFolder dependenciesFolder)
             : base(dependenciesFolder) {
             _assemblyLoader = assemblyLoader;
+            _dependenciesFolder = dependenciesFolder;
 
             Logger = NullLogger.Instance;
         }
@@ -59,6 +61,15 @@ namespace Orchard.Environment.Extensions.Loaders {
             };
         }
 
+        public override bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+            var dependency = _dependenciesFolder.GetDescriptor(descriptor.Id);
+            if (dependency != null && dependency.LoaderName == this.Name) {
+                return _assemblyLoader.Load(CoreAssemblyName) != null;
+            }
+
+            return false;
+        }
+
         private static bool IsTypeFromModule(Type type, ExtensionDescriptor descriptor) {
             return (type.Namespace + ".").StartsWith(CoreAssemblyName + "." + descriptor.Id + ".");
         }

src/Orchard/Environment/Extensions/Loaders/DynamicExtensionLoader.cs

@@ -212,6 +212,20 @@ namespace Orchard.Environment.Extensions.Loaders {
             return dependencies;
         }
 
+        public override bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+            var dependency = _dependenciesFolder.GetDescriptor(descriptor.Id);
+            if (dependency != null && dependency.LoaderName == this.Name) {
+                var projectPath = GetProjectPath(descriptor);
+                if (projectPath == null) {
+                    return false;
+                }
+
+                return _buildManager.GetCompiledAssembly(projectPath) != null;
+            }
+
+            return false;
+        }
+
         private void AddDependencies(string projectPath, HashSet<string> currentSet) {
             // Skip files from locations other than "~/Modules" and "~/Themes" etc.
             if (string.IsNullOrEmpty(PrefixMatch(projectPath, _extensionsVirtualPathPrefixes))) {

src/Orchard/Environment/Extensions/Loaders/ExtensionLoaderBase.cs

@@ -57,5 +57,7 @@ namespace Orchard.Environment.Extensions.Loaders {
         public virtual IEnumerable<string> GetVirtualPathDependencies(DependencyDescriptor dependency) {
             return Enumerable.Empty<string>();
         }
+
+        public abstract bool LoaderIsSuitable(ExtensionDescriptor descriptor);
     }
 }

src/Orchard/Environment/Extensions/Loaders/IExtensionLoader.cs

@@ -59,5 +59,7 @@ namespace Orchard.Environment.Extensions.Loaders {
         /// For example, Razor or WebForms views needs to be recompiled when a dependency of a module changes.
         /// </summary>
         IEnumerable<string> GetVirtualPathDependencies(DependencyDescriptor dependency);
+
+        bool LoaderIsSuitable(ExtensionDescriptor descriptor);
     }
 }

src/Orchard/Environment/Extensions/Loaders/PrecompiledExtensionLoader.cs

@@ -19,6 +19,7 @@ namespace Orchard.Environment.Extensions.Loaders {
         private readonly IAssemblyProbingFolder _assemblyProbingFolder;
         private readonly IVirtualPathProvider _virtualPathProvider;
         private readonly IVirtualPathMonitor _virtualPathMonitor;
+        private readonly IDependenciesFolder _dependenciesFolder;
 
         public PrecompiledExtensionLoader(
             IHostEnvironment hostEnvironment,
@@ -31,6 +32,7 @@ namespace Orchard.Environment.Extensions.Loaders {
             _assemblyProbingFolder = assemblyProbingFolder;
             _virtualPathProvider = virtualPathProvider;
             _virtualPathMonitor = virtualPathMonitor;
+            _dependenciesFolder = dependenciesFolder;
 
             Logger = NullLogger.Instance;
         }
@@ -166,7 +168,7 @@ namespace Orchard.Environment.Extensions.Loaders {
                     Loader = this,
                     Name = Path.GetFileNameWithoutExtension(path),
                     VirtualPath = path
-                } )
+                })
                 .ToList();
 
             Logger.Information("Done probing references for module '{0}'", descriptor.Id);
@@ -244,5 +246,14 @@ namespace Orchard.Environment.Extensions.Loaders {
 
             return assemblyPath;
         }
+
+        public override bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+            var dependency = _dependenciesFolder.GetDescriptor(descriptor.Id);
+            if (dependency != null && dependency.LoaderName == this.Name) {
+                return _assemblyProbingFolder.AssemblyExists(descriptor.Id);
+            }
+
+            return false;
+        }
     }
 }

src/Orchard/Environment/Extensions/Loaders/RawThemeExtensionLoader.cs

@@ -8,10 +8,12 @@ using Orchard.Logging;
 namespace Orchard.Environment.Extensions.Loaders {
     public class RawThemeExtensionLoader : ExtensionLoaderBase {
         private readonly IVirtualPathProvider _virtualPathProvider;
+        private readonly IDependenciesFolder _dependenciesFolder;
 
         public RawThemeExtensionLoader(IDependenciesFolder dependenciesFolder, IVirtualPathProvider virtualPathProvider)
             : base(dependenciesFolder) {
             _virtualPathProvider = virtualPathProvider;
+            _dependenciesFolder = dependenciesFolder;
 
             Logger = NullLogger.Instance;
         }
@@ -26,12 +28,12 @@ namespace Orchard.Environment.Extensions.Loaders {
                 return null;
 
             // Temporary - theme without own project should be under ~/themes
-            if (descriptor.Location.StartsWith("~/Themes",StringComparison.InvariantCultureIgnoreCase)) {
+            if (descriptor.Location.StartsWith("~/Themes", StringComparison.InvariantCultureIgnoreCase)) {
                 string projectPath = _virtualPathProvider.Combine(descriptor.Location, descriptor.Id,
                                            descriptor.Id + ".csproj");
 
                 // ignore themes including a .csproj in this loader
-                if ( _virtualPathProvider.FileExists(projectPath) ) {
+                if (_virtualPathProvider.FileExists(projectPath)) {
                     return null;
                 }
 
@@ -39,7 +41,7 @@ namespace Orchard.Environment.Extensions.Loaders {
                                                 descriptor.Id + ".dll");
 
                 // ignore themes with /bin in this loader
-                if ( _virtualPathProvider.FileExists(assemblyPath) )
+                if (_virtualPathProvider.FileExists(assemblyPath))
                     return null;
 
                 return new ExtensionProbeEntry {
@@ -64,5 +66,14 @@ namespace Orchard.Environment.Extensions.Loaders {
                 ExportedTypes = new Type[0]
             };
         }
+
+        public override bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+            var dependency = _dependenciesFolder.GetDescriptor(descriptor.Id);
+            if (dependency != null && dependency.LoaderName == this.Name) {
+                return true;
+            }
+
+            return false;
+        }
     }
 }

src/Orchard/Environment/Extensions/Loaders/ReferencedExtensionLoader.cs

@@ -13,12 +13,14 @@ namespace Orchard.Environment.Extensions.Loaders {
     public class ReferencedExtensionLoader : ExtensionLoaderBase {
         private readonly IVirtualPathProvider _virtualPathProvider;
         private readonly IBuildManager _buildManager;
+        private readonly IDependenciesFolder _dependenciesFolder;
 
         public ReferencedExtensionLoader(IDependenciesFolder dependenciesFolder, IVirtualPathProvider virtualPathProvider, IBuildManager buildManager)
             : base(dependenciesFolder) {
 
             _virtualPathProvider = virtualPathProvider;
             _buildManager = buildManager;
+            _dependenciesFolder = dependenciesFolder;
             Logger = NullLogger.Instance;
         }
 
@@ -82,5 +84,14 @@ namespace Orchard.Environment.Extensions.Loaders {
                 ExportedTypes = assembly.GetExportedTypes()
             };
         }
+
+        public override bool LoaderIsSuitable(ExtensionDescriptor descriptor) {
+            var dependency = _dependenciesFolder.GetDescriptor(descriptor.Id);
+            if (dependency != null && dependency.LoaderName == this.Name) {
+                return _buildManager.GetReferencedAssembly(descriptor.Id) != null;
+            }
+
+            return false;
+        }
     }
 }

src/Orchard/Environment/Features/FeatureManager.cs

@@ -4,7 +4,7 @@ using System.Linq;
 using Orchard.Environment.Descriptor;
 using Orchard.Environment.Descriptor.Models;
 using Orchard.Environment.Extensions;
-using Orchard.Environment.Extensions.Helpers;
+using Orchard.Environment.Extensions.Loaders;
 using Orchard.Environment.Extensions.Models;
 using Orchard.Localization;
 using Orchard.Logging;
@@ -13,6 +13,7 @@ namespace Orchard.Environment.Features {
     public class FeatureManager : IFeatureManager {
         private readonly IExtensionManager _extensionManager;
         private readonly IShellDescriptorManager _shellDescriptorManager;
+        private readonly IEnumerable<IExtensionLoader> _loaders;
 
         /// <summary>
         /// Delegate to notify about feature dependencies.
@@ -21,10 +22,11 @@ namespace Orchard.Environment.Features {
 
         public FeatureManager(
             IExtensionManager extensionManager,
-            IShellDescriptorManager shellDescriptorManager) {
+            IShellDescriptorManager shellDescriptorManager,
+            IEnumerable<IExtensionLoader> loaders) {
             _extensionManager = extensionManager;
             _shellDescriptorManager = shellDescriptorManager;
-
+            _loaders = loaders;
             T = NullLocalizer.Instance;
             Logger = NullLogger.Instance;
         }
@@ -161,6 +163,22 @@ namespace Orchard.Environment.Features {
             return GetAffectedFeatures(featureId, availableFeatures, getEnabledDependants);
         }
 
+        public bool HasLoader(string featureId) {
+            var descriptor = _extensionManager
+                .AvailableExtensions()
+                .Where(d => DefaultExtensionTypes.IsModule(d.ExtensionType) || DefaultExtensionTypes.IsTheme(d.ExtensionType))
+                .OrderBy(d => d.Id)
+                .FirstOrDefault(e => e.Id == featureId || e.Features.Select(f => f.Id).Contains(featureId));
+
+            foreach (var loader in _loaders) {
+                if (loader.LoaderIsSuitable(descriptor)) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         /// <summary>
         /// Enables a feature.
         /// </summary>

src/Orchard/Environment/Features/IFeatureManager.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using Orchard.Environment.Extensions.Models;
+using Orchard.Environment.Extensions;
 
 namespace Orchard.Environment.Features {
     public delegate void FeatureDependencyNotificationHandler(string messageFormat, string featureId, IEnumerable<string> featureIds);
@@ -61,5 +62,12 @@ namespace Orchard.Environment.Features {
         /// <param name="featureId">ID of the feature to check.</param>
         /// <returns>An enumeration with dependent feature IDs.</returns>
         IEnumerable<string> GetDependentFeatures(string featureId);
+
+        /// <summary>
+        /// Checks whether the feature's extension has a loadee, i.e. a suitable <see cref="IExtensionLoader"/> can be found.
+        /// </summary>
+        /// <param name="featureId">ID of the feature to check.</param>
+        /// <returns><c>True</c> if a suitable <see cref="IExtensionLoader"/> can be found.</returns>
+        bool HasLoader(string featureId);
     }
 }