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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Web.Mvc.Properties;
using System.Web.Mvc.Routing;
using System.Web.Routing;
using System.Web.SessionState;
namespace System.Web.Mvc
{
public class DefaultControllerFactory : IControllerFactory
{
private static readonly ConcurrentDictionary<Type, SessionStateBehavior> _sessionStateCache = new ConcurrentDictionary<Type, SessionStateBehavior>();
private static ControllerTypeCache _staticControllerTypeCache = new ControllerTypeCache();
private IBuildManager _buildManager;
private IResolver<IControllerActivator> _activatorResolver;
private IControllerActivator _controllerActivator;
private ControllerBuilder _controllerBuilder;
private ControllerTypeCache _instanceControllerTypeCache;
public DefaultControllerFactory()
: this(null, null, null)
{
}
public DefaultControllerFactory(IControllerActivator controllerActivator)
: this(controllerActivator, null, null)
{
}
internal DefaultControllerFactory(IControllerActivator controllerActivator, IResolver<IControllerActivator> activatorResolver, IDependencyResolver dependencyResolver)
{
if (controllerActivator != null)
{
_controllerActivator = controllerActivator;
}
else
{
_activatorResolver = activatorResolver ?? new SingleServiceResolver<IControllerActivator>(
() => null,
new DefaultControllerActivator(dependencyResolver),
"DefaultControllerFactory constructor");
}
}
private IControllerActivator ControllerActivator
{
get
{
if (_controllerActivator != null)
{
return _controllerActivator;
}
_controllerActivator = _activatorResolver.Current;
return _controllerActivator;
}
}
internal IBuildManager BuildManager
{
get
{
if (_buildManager == null)
{
_buildManager = new BuildManagerWrapper();
}
return _buildManager;
}
set { _buildManager = value; }
}
internal ControllerBuilder ControllerBuilder
{
get { return _controllerBuilder ?? ControllerBuilder.Current; }
set { _controllerBuilder = value; }
}
internal ControllerTypeCache ControllerTypeCache
{
get { return _instanceControllerTypeCache ?? _staticControllerTypeCache; }
set { _instanceControllerTypeCache = value; }
}
internal static InvalidOperationException CreateAmbiguousControllerException(RouteBase route, string controllerName, ICollection<Type> matchingTypes)
{
// we need to generate an exception containing all the controller types
StringBuilder typeList = new StringBuilder();
foreach (Type matchedType in matchingTypes)
{
typeList.AppendLine();
typeList.Append(matchedType.FullName);
}
string errorText;
Route castRoute = route as Route;
if (castRoute != null)
{
errorText = String.Format(CultureInfo.CurrentCulture, MvcResources.DefaultControllerFactory_ControllerNameAmbiguous_WithRouteUrl,
controllerName, castRoute.Url, typeList, Environment.NewLine);
}
else
{
errorText = String.Format(CultureInfo.CurrentCulture, MvcResources.DefaultControllerFactory_ControllerNameAmbiguous_WithoutRouteUrl,
controllerName, typeList, Environment.NewLine);
}
return new InvalidOperationException(errorText);
}
private static InvalidOperationException CreateDirectRouteAmbiguousControllerException(ICollection<Type> matchingTypes)
{
// we need to generate an exception containing all the controller types
StringBuilder typeList = new StringBuilder();
foreach (Type matchedType in matchingTypes)
{
typeList.AppendLine();
typeList.Append(matchedType.FullName);
}
string errorText = String.Format(
CultureInfo.CurrentCulture,
MvcResources.DefaultControllerFactory_DirectRouteAmbiguous,
typeList,
Environment.NewLine);
return new InvalidOperationException(errorText);
}
public virtual IController CreateController(RequestContext requestContext, string controllerName)
{
if (requestContext == null)
{
throw new ArgumentNullException("requestContext");
}
if (String.IsNullOrEmpty(controllerName) &&
(requestContext.RouteData == null || !requestContext.RouteData.HasDirectRouteMatch()))
{
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "controllerName");
}
Type controllerType = GetControllerType(requestContext, controllerName);
IController controller = GetControllerInstance(requestContext, controllerType);
return controller;
}
protected internal virtual IController GetControllerInstance(RequestContext requestContext, Type controllerType)
{
if (requestContext == null)
{
throw new ArgumentNullException("requestContext");
}
if (controllerType == null)
{
throw new HttpException(404,
String.Format(
CultureInfo.CurrentCulture,
MvcResources.DefaultControllerFactory_NoControllerFound,
requestContext.HttpContext.Request.Path));
}
if (!typeof(IController).IsAssignableFrom(controllerType))
{
throw new ArgumentException(
String.Format(
CultureInfo.CurrentCulture,
MvcResources.DefaultControllerFactory_TypeDoesNotSubclassControllerBase,
controllerType),
"controllerType");
}
return ControllerActivator.Create(requestContext, controllerType);
}
protected internal virtual SessionStateBehavior GetControllerSessionBehavior(RequestContext requestContext, Type controllerType)
{
if (controllerType == null)
{
return SessionStateBehavior.Default;
}
return _sessionStateCache.GetOrAdd(
controllerType,
type =>
{
var attr = type.GetCustomAttributes(typeof(SessionStateAttribute), inherit: true)
.OfType<SessionStateAttribute>()
.FirstOrDefault();
return (attr != null) ? attr.Behavior : SessionStateBehavior.Default;
});
}
protected internal virtual Type GetControllerType(RequestContext requestContext, string controllerName)
{
if (requestContext == null)
{
throw new ArgumentNullException("requestContext");
}
if (String.IsNullOrEmpty(controllerName) &&
(requestContext.RouteData == null || !requestContext.RouteData.HasDirectRouteMatch()))
{
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "controllerName");
}
RouteData routeData = requestContext.RouteData;
if (routeData != null && routeData.HasDirectRouteMatch())
{
return GetControllerTypeFromDirectRoute(routeData);
}
// first search in the current route's namespace collection
object routeNamespacesObj;
Type match;
if (routeData != null && routeData.DataTokens.TryGetValue(RouteDataTokenKeys.Namespaces, out routeNamespacesObj))
{
IEnumerable<string> routeNamespaces = routeNamespacesObj as IEnumerable<string>;
if (routeNamespaces != null && routeNamespaces.Any())
{
HashSet<string> namespaceHash = new HashSet<string>(routeNamespaces, StringComparer.OrdinalIgnoreCase);
match = GetControllerTypeWithinNamespaces(routeData.Route, controllerName, namespaceHash);
// the UseNamespaceFallback key might not exist, in which case its value is implicitly "true"
if (match != null || false.Equals(routeData.DataTokens[RouteDataTokenKeys.UseNamespaceFallback]))
{
// got a match or the route requested we stop looking
return match;
}
}
}
// then search in the application's default namespace collection
RouteBase route = routeData == null ? null : routeData.Route;
if (ControllerBuilder.DefaultNamespaces.Count > 0)
{
HashSet<string> namespaceDefaults = new HashSet<string>(ControllerBuilder.DefaultNamespaces, StringComparer.OrdinalIgnoreCase);
match = GetControllerTypeWithinNamespaces(route, controllerName, namespaceDefaults);
if (match != null)
{
return match;
}
}
// if all else fails, search every namespace
return GetControllerTypeWithinNamespaces(route, controllerName, null /* namespaces */);
}
private static Type GetControllerTypeFromDirectRoute(RouteData routeData)
{
Contract.Assert(routeData != null);
var matchingRouteDatas = routeData.GetDirectRouteMatches();
List<Type> controllerTypes = new List<Type>();
foreach (var directRouteData in matchingRouteDatas)
{
if (directRouteData != null)
{
Type controllerType = directRouteData.GetTargetControllerType();
if (controllerType == null)
{
// We don't expect this to happen, but it could happen if some code messes with the
// route data tokens and removes the key we're looking for.
throw new InvalidOperationException(MvcResources.DirectRoute_MissingControllerType);
}
if (!controllerTypes.Contains(controllerType))
{
controllerTypes.Add(controllerType);
}
}
}
// We only want to handle the case where all matched direct routes refer to the same controller.
// Handling the multiple-controllers case would put attribute routing down a totally different
// path than traditional routing.
if (controllerTypes.Count == 0)
{
return null;
}
else if (controllerTypes.Count == 1)
{
return controllerTypes[0];
}
else
{
throw CreateDirectRouteAmbiguousControllerException(controllerTypes);
}
}
private Type GetControllerTypeWithinNamespaces(RouteBase route, string controllerName, HashSet<string> namespaces)
{
// Once the master list of controllers has been created we can quickly index into it
ControllerTypeCache.EnsureInitialized(BuildManager);
ICollection<Type> matchingTypes = ControllerTypeCache.GetControllerTypes(controllerName, namespaces);
switch (matchingTypes.Count)
{
case 0:
// no matching types
return null;
case 1:
// single matching type
return matchingTypes.First();
default:
// multiple matching types
throw CreateAmbiguousControllerException(route, controllerName, matchingTypes);
}
}
public virtual void ReleaseController(IController controller)
{
IDisposable disposable = controller as IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
}
internal IReadOnlyList<Type> GetControllerTypes()
{
ControllerTypeCache.EnsureInitialized(BuildManager);
return ControllerTypeCache.GetControllerTypes();
}
SessionStateBehavior IControllerFactory.GetControllerSessionBehavior(RequestContext requestContext, string controllerName)
{
if (requestContext == null)
{
throw new ArgumentNullException("requestContext");
}
if (String.IsNullOrEmpty(controllerName))
{
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "controllerName");
}
Type controllerType = GetControllerType(requestContext, controllerName);
return GetControllerSessionBehavior(requestContext, controllerType);
}
private class DefaultControllerActivator : IControllerActivator
{
private Func<IDependencyResolver> _resolverThunk;
public DefaultControllerActivator()
: this(null)
{
}
public DefaultControllerActivator(IDependencyResolver resolver)
{
if (resolver == null)
{
_resolverThunk = () => DependencyResolver.Current;
}
else
{
_resolverThunk = () => resolver;
}
}
public IController Create(RequestContext requestContext, Type controllerType)
{
try
{
return (IController)(_resolverThunk().GetService(controllerType) ?? Activator.CreateInstance(controllerType));
}
catch (Exception ex)
{
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
MvcResources.DefaultControllerFactory_ErrorCreatingController,
controllerType),
ex);
}
}
}
}
}
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