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NewtonsoftJsonValidationMetadataProvider.cs
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NewtonsoftJsonValidationMetadataProvider.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Linq;
using Microsoft.AspNetCore.Mvc.ModelBinding.Metadata;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
namespace Microsoft.AspNetCore.Mvc.NewtonsoftJson;
/// <summary>
/// An implementation of <see cref="IDisplayMetadataProvider"/> and <see cref="IValidationMetadataProvider"/> for
/// the Newtonsoft.Json attribute classes.
/// </summary>
public sealed class NewtonsoftJsonValidationMetadataProvider : IDisplayMetadataProvider, IValidationMetadataProvider
{
private readonly NamingStrategy _jsonNamingPolicy;
/// <summary>
/// Creates a new <see cref="NewtonsoftJsonValidationMetadataProvider"/> with the default <see cref="CamelCaseNamingStrategy"/>
/// </summary>
public NewtonsoftJsonValidationMetadataProvider()
: this(new CamelCaseNamingStrategy())
{ }
/// <summary>
/// Initializes a new instance of <see cref="NewtonsoftJsonValidationMetadataProvider"/> with an optional <see cref="NamingStrategy"/>
/// </summary>
/// <param name="namingStrategy">The <see cref="NamingStrategy"/> to be used to configure the metadata provider.</param>
public NewtonsoftJsonValidationMetadataProvider(NamingStrategy namingStrategy)
{
if (namingStrategy == null)
{
throw new ArgumentNullException(nameof(namingStrategy));
}
_jsonNamingPolicy = namingStrategy;
}
/// <inheritdoc />
public void CreateDisplayMetadata(DisplayMetadataProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var propertyName = ReadPropertyNameFrom(context.Attributes);
if (!string.IsNullOrEmpty(propertyName))
{
context.DisplayMetadata.DisplayName = () => propertyName;
}
}
/// <inheritdoc />
public void CreateValidationMetadata(ValidationMetadataProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var propertyName = ReadPropertyNameFrom(context.Attributes);
if (string.IsNullOrEmpty(propertyName))
{
propertyName = _jsonNamingPolicy.GetPropertyName(context.Key.Name!, false);
}
context.ValidationMetadata.ValidationModelName = propertyName!;
}
private static string? ReadPropertyNameFrom(IReadOnlyList<object> attributes)
=> attributes?.OfType<JsonPropertyAttribute>().FirstOrDefault()?.PropertyName;
}