Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

external/aspnetwebstack/src/System.Web.Http/Controllers/HttpActionContextExtensions.cs

@@ -0,0 +1,124 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
+
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Web.Http.Metadata;
+using System.Web.Http.ModelBinding;
+using System.Web.Http.Properties;
+using System.Web.Http.Validation;
+
+namespace System.Web.Http.Controllers
+{
+    /// <summary>
+    /// Extension methods for <see cref="HttpActionContext"/>.
+    /// </summary>
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    public static class HttpActionContextExtensions
+    {
+        /// <summary>
+        /// Gets the <see cref="ModelMetadataProvider"/> instance for a given <see cref="HttpActionContext"/>.
+        /// </summary>
+        /// <param name="actionContext">The context.</param>
+        /// <returns>An <see cref="ModelMetadataProvider"/> instance.</returns>
+        public static ModelMetadataProvider GetMetadataProvider(this HttpActionContext actionContext)
+        {
+            if (actionContext == null)
+            {
+                throw Error.ArgumentNull("actionContext");
+            }
+
+            return actionContext.ControllerContext.Configuration.Services.GetModelMetadataProvider();
+        }
+
+        /// <summary>
+        /// Gets the collection of registered <see cref="ModelValidatorProvider"/> instances.
+        /// </summary>
+        /// <param name="actionContext">The context.</param>
+        /// <returns>A collection of <see cref="ModelValidatorProvider"/> instances.</returns>
+        public static IEnumerable<ModelValidatorProvider> GetValidatorProviders(this HttpActionContext actionContext)
+        {
+            if (actionContext == null)
+            {
+                throw Error.ArgumentNull("actionContext");
+            }
+
+            return actionContext.ControllerContext.Configuration.Services.GetModelValidatorProviders();
+        }
+
+        /// <summary>
+        /// Gets the collection of registered <see cref="ModelValidator"/> instances.
+        /// </summary>
+        /// <param name="actionContext">The context.</param>
+        /// <param name="metadata">The metadata.</param>
+        /// <returns>A collection of registered <see cref="ModelValidator"/> instances.</returns>
+        public static IEnumerable<ModelValidator> GetValidators(this HttpActionContext actionContext, ModelMetadata metadata)
+        {
+            if (actionContext == null)
+            {
+                throw Error.ArgumentNull("actionContext");
+            }
+
+            IEnumerable<ModelValidatorProvider> validatorProviders = GetValidatorProviders(actionContext);
+            return validatorProviders.SelectMany(provider => provider.GetValidators(metadata, validatorProviders));
+        }
+
+        /// <summary>
+        /// Gets the <see cref="ModelBindingContext"/> for this <see cref="HttpActionContext"/>.
+        /// </summary>
+        /// <param name="actionContext">The action context.</param>
+        /// <param name="bindingContext">The binding context.</param>
+        /// <param name="binder">When this method returns, the value associated with the specified binding context, if the context is found; otherwise, the default value for the type of the value parameter.</param>
+        /// <returns><c>true</c> if <see cref="ModelBindingContext"/> was present; otherwise <c>false</c>.</returns>
+        public static bool TryGetBinder(this HttpActionContext actionContext, ModelBindingContext bindingContext, out IModelBinder binder)
+        {
+            if (actionContext == null)
+            {
+                throw Error.ArgumentNull("actionContext");
+            }
+
+            if (bindingContext == null)
+            {
+                throw Error.ArgumentNull("bindingContext");
+            }
+
+            binder = null;
+            ModelBinderProvider providerFromAttr;
+            if (ModelBindingHelper.TryGetProviderFromAttributes(bindingContext.ModelType, out providerFromAttr))
+            {
+                binder = providerFromAttr.GetBinder(actionContext, bindingContext);
+            }
+            else
+            {
+                binder = actionContext.ControllerContext.Configuration.Services.GetModelBinderProviders()
+                    .Select(p => p.GetBinder(actionContext, bindingContext))
+                    .Where(b => b != null)
+                    .FirstOrDefault();
+            }
+
+            return binder != null;
+        }
+
+        /// <summary>
+        /// Gets the <see cref="ModelBindingContext"/> for this <see cref="HttpActionContext"/>.
+        /// </summary>
+        /// <param name="actionContext">The execution context.</param>
+        /// <param name="bindingContext">The binding context.</param>
+        /// <returns>The <see cref="ModelBindingContext"/>.</returns>
+        public static IModelBinder GetBinder(this HttpActionContext actionContext, ModelBindingContext bindingContext)
+        {
+            if (actionContext == null)
+            {
+                throw Error.ArgumentNull("actionContext");
+            }
+
+            IModelBinder binder;
+            if (TryGetBinder(actionContext, bindingContext, out binder))
+            {
+                return binder;
+            }
+
+            throw Error.InvalidOperation(SRResources.ModelBinderProviderCollection_BinderForTypeNotFound, bindingContext.ModelType);
+        }
+    }
+}