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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Linq;
using System.Web.Http.Controllers;
using System.Web.Http.Internal;
using System.Web.Http.Metadata;
using System.Web.Http.ModelBinding.Binders;
using System.Web.Http.Properties;
namespace System.Web.Http.ModelBinding
{
internal static class ModelBindingHelper
{
internal static TModel CastOrDefault<TModel>(object model)
{
return (model is TModel) ? (TModel)model : default(TModel);
}
internal static string CreateIndexModelName(string parentName, int index)
{
return CreateIndexModelName(parentName, index.ToString(CultureInfo.InvariantCulture));
}
internal static string CreateIndexModelName(string parentName, string index)
{
return (parentName.Length == 0) ? "[" + index + "]" : parentName + "[" + index + "]";
}
internal static string CreatePropertyModelName(string prefix, string propertyName)
{
if (String.IsNullOrEmpty(prefix))
{
return propertyName ?? String.Empty;
}
else if (String.IsNullOrEmpty(propertyName))
{
return prefix ?? String.Empty;
}
else
{
return prefix + "." + propertyName;
}
}
// Concatenate model keys, if suffix is an indexer, concat strings; otherwise insert a period between the two
internal static string ConcatenateKeys(string prefix, string suffix)
{
Contract.Assert(!String.IsNullOrEmpty(prefix));
if (String.IsNullOrEmpty(suffix))
{
return prefix;
}
return suffix.StartsWith("[", StringComparison.Ordinal) ? prefix + suffix : prefix + "." + suffix;
}
internal static IModelBinder GetPossibleBinderInstance(Type closedModelType, Type openModelType, Type openBinderType)
{
Type[] typeArguments = TypeHelper.GetTypeArgumentsIfMatch(closedModelType, openModelType);
return (typeArguments != null) ? (IModelBinder)Activator.CreateInstance(openBinderType.MakeGenericType(typeArguments)) : null;
}
internal static object[] RawValueToObjectArray(object rawValue)
{
// precondition: rawValue is not null
// Need to special-case String so it's not caught by the IEnumerable check which follows
if (rawValue is string)
{
return new[] { rawValue };
}
object[] rawValueAsObjectArray = rawValue as object[];
if (rawValueAsObjectArray != null)
{
return rawValueAsObjectArray;
}
IEnumerable rawValueAsEnumerable = rawValue as IEnumerable;
if (rawValueAsEnumerable != null)
{
return rawValueAsEnumerable.Cast<object>().ToArray();
}
// fallback
return new[] { rawValue };
}
internal static void ReplaceEmptyStringWithNull(ModelMetadata modelMetadata, ref object model)
{
if (model is string &&
modelMetadata.ConvertEmptyStringToNull &&
String.IsNullOrWhiteSpace(model as string))
{
model = null;
}
}
// Returns true if the ModelBinderAttribute specifies a binder provider of <TProvider> or binder instance of <TBinder>
internal static bool IsModelBinderFor<TProvider, TBinder>(ModelBinderAttribute modelBinderAttribute)
{
Contract.Assert(modelBinderAttribute != null, "modelBinderAttribute cannot be null");
Type binderType = modelBinderAttribute.BinderType;
return binderType != null &&
(typeof(TProvider).IsAssignableFrom(binderType) ||
typeof(TBinder).IsAssignableFrom(binderType));
}
internal static bool TryGetProviderFromAttribute(Type modelType, ModelBinderAttribute modelBinderAttribute, out ModelBinderProvider provider)
{
Contract.Assert(modelType != null, "modelType cannot be null.");
Contract.Assert(modelBinderAttribute != null, "modelBinderAttribute cannot be null");
if (typeof(ModelBinderProvider).IsAssignableFrom(modelBinderAttribute.BinderType))
{
// REVIEW: DI?
provider = (ModelBinderProvider)Activator.CreateInstance(modelBinderAttribute.BinderType);
}
else if (typeof(IModelBinder).IsAssignableFrom(modelBinderAttribute.BinderType))
{
Type closedBinderType =
modelBinderAttribute.BinderType.IsGenericTypeDefinition
? modelBinderAttribute.BinderType.MakeGenericType(modelType.GetGenericArguments())
: modelBinderAttribute.BinderType;
IModelBinder binderInstance = (IModelBinder)Activator.CreateInstance(closedBinderType);
provider = new SimpleModelBinderProvider(modelType, binderInstance) { SuppressPrefixCheck = modelBinderAttribute.SuppressPrefixCheck };
}
else
{
throw Error.InvalidOperation(SRResources.ModelBinderProviderCollection_InvalidBinderType, modelBinderAttribute.BinderType, typeof(ModelBinderProvider), typeof(IModelBinder));
}
return true;
}
internal static bool TryGetProviderFromAttributes(Type modelType, out ModelBinderProvider provider)
{
ModelBinderAttribute attr = TypeDescriptorHelper.Get(modelType).GetAttributes().OfType<ModelBinderAttribute>().FirstOrDefault();
if (attr == null)
{
provider = null;
return false;
}
return TryGetProviderFromAttribute(modelType, attr, out provider);
}
internal static bool TryGetProviderFromAttributes(HttpParameterDescriptor parameterDescriptor, out ModelBinderProvider provider)
{
Contract.Assert(parameterDescriptor != null, "parameterDescriptor cannot be null.");
Type modelType = parameterDescriptor.ParameterType;
ModelBinderAttribute attr = parameterDescriptor.GetCustomAttributes<ModelBinderAttribute>().FirstOrDefault();
if (attr == null)
{
attr = TypeDescriptorHelper.Get(modelType).GetAttributes().OfType<ModelBinderAttribute>().FirstOrDefault();
}
if (attr == null)
{
provider = null;
return false;
}
return TryGetProviderFromAttribute(modelType, attr, out provider);
}
internal static void ValidateBindingContext(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw Error.ArgumentNull("bindingContext");
}
if (bindingContext.ModelMetadata == null)
{
throw Error.Argument("bindingContext", SRResources.ModelBinderUtil_ModelMetadataCannotBeNull);
}
}
internal static void ValidateBindingContext(ModelBindingContext bindingContext, Type requiredType, bool allowNullModel)
{
ValidateBindingContext(bindingContext);
if (bindingContext.ModelType != requiredType)
{
throw Error.Argument("bindingContext", SRResources.ModelBinderUtil_ModelTypeIsWrong, bindingContext.ModelType, requiredType);
}
if (!allowNullModel && bindingContext.Model == null)
{
throw Error.Argument("bindingContext", SRResources.ModelBinderUtil_ModelCannotBeNull, requiredType);
}
if (bindingContext.Model != null && !requiredType.IsInstanceOfType(bindingContext.Model))
{
throw Error.Argument("bindingContext", SRResources.ModelBinderUtil_ModelInstanceIsWrong, bindingContext.Model.GetType(), requiredType);
}
}
}
}
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