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JsonSerializerDataContractResolver.cs
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JsonSerializerDataContractResolver.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace Swashbuckle.AspNetCore.SwaggerGen
{
public class JsonSerializerDataContractResolver : ISerializerDataContractResolver
{
private readonly JsonSerializerOptions _serializerOptions;
public JsonSerializerDataContractResolver(JsonSerializerOptions serializerOptions)
{
_serializerOptions = serializerOptions;
}
public DataContract GetDataContractForType(Type type)
{
if (type.IsOneOf(typeof(object), typeof(JsonDocument), typeof(JsonElement)))
{
return DataContract.ForDynamic(
underlyingType: type,
jsonConverter: JsonConverterFunc);
}
if (PrimitiveTypesAndFormats.ContainsKey(type))
{
var primitiveTypeAndFormat = PrimitiveTypesAndFormats[type];
return DataContract.ForPrimitive(
underlyingType: type,
dataType: primitiveTypeAndFormat.Item1,
dataFormat: primitiveTypeAndFormat.Item2,
jsonConverter: JsonConverterFunc);
}
if (type.IsEnum)
{
var enumValues = type.GetEnumValues();
//Test to determine if the serializer will treat as string
var serializeAsString = (enumValues.Length > 0)
&& JsonConverterFunc(enumValues.GetValue(0)).StartsWith("\"");
var primitiveTypeAndFormat = serializeAsString
? PrimitiveTypesAndFormats[typeof(string)]
: PrimitiveTypesAndFormats[type.GetEnumUnderlyingType()];
return DataContract.ForPrimitive(
underlyingType: type,
dataType: primitiveTypeAndFormat.Item1,
dataFormat: primitiveTypeAndFormat.Item2,
jsonConverter: JsonConverterFunc);
}
if (IsSupportedDictionary(type, out Type keyType, out Type valueType))
{
return DataContract.ForDictionary(
underlyingType: type,
valueType: valueType,
keys: null, // STJ doesn't currently support dictionaries with enum key types
jsonConverter: JsonConverterFunc);
}
if (IsSupportedCollection(type, out Type itemType))
{
return DataContract.ForArray(
underlyingType: type,
itemType: itemType,
jsonConverter: JsonConverterFunc);
}
return DataContract.ForObject(
underlyingType: type,
properties: GetDataPropertiesFor(type, out Type extensionDataType),
extensionDataType: extensionDataType,
jsonConverter: JsonConverterFunc);
}
private string JsonConverterFunc(object value)
{
return JsonSerializer.Serialize(value, _serializerOptions);
}
public bool IsSupportedDictionary(Type type, out Type keyType, out Type valueType)
{
if (type.IsConstructedFrom(typeof(IDictionary<,>), out Type constructedType)
|| type.IsConstructedFrom(typeof(IReadOnlyDictionary<,>), out constructedType))
{
keyType = constructedType.GenericTypeArguments[0];
valueType = constructedType.GenericTypeArguments[1];
return true;
}
if (typeof(IDictionary).IsAssignableFrom(type))
{
keyType = valueType = typeof(object);
return true;
}
keyType = valueType = null;
return false;
}
public bool IsSupportedCollection(Type type, out Type itemType)
{
if (type.IsConstructedFrom(typeof(IEnumerable<>), out Type constructedType))
{
itemType = constructedType.GenericTypeArguments[0];
return true;
}
#if (!NETSTANDARD2_0)
if (type.IsConstructedFrom(typeof(IAsyncEnumerable<>), out constructedType))
{
itemType = constructedType.GenericTypeArguments[0];
return true;
}
#endif
if (typeof(IEnumerable).IsAssignableFrom(type))
{
itemType = typeof(object);
return true;
}
itemType = null;
return false;
}
private IEnumerable<DataProperty> GetDataPropertiesFor(Type objectType, out Type extensionDataType)
{
extensionDataType = null;
const BindingFlags PublicBindingAttr = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
var publicProperties = objectType.IsInterface
? new[] { objectType }.Concat(objectType.GetInterfaces()).SelectMany(i => i.GetProperties(PublicBindingAttr))
: objectType.GetProperties(PublicBindingAttr);
var applicableProperties = publicProperties
.Where(property =>
{
// .Net 5 introduces JsonIgnoreAttribute.Condition which should be honored
bool isIgnoredViaNet5Attribute = true;
#if NET5_0
JsonIgnoreAttribute jsonIgnoreAttribute = property.GetCustomAttribute<JsonIgnoreAttribute>();
if (jsonIgnoreAttribute != null)
{
isIgnoredViaNet5Attribute = jsonIgnoreAttribute.Condition switch
{
JsonIgnoreCondition.Never => false,
JsonIgnoreCondition.Always => true,
JsonIgnoreCondition.WhenWritingDefault => false,
JsonIgnoreCondition.WhenWritingNull => false,
_ => true
};
}
#endif
return
(property.IsPubliclyReadable() || property.IsPubliclyWritable()) &&
!(property.GetIndexParameters().Any()) &&
!(property.HasAttribute<JsonIgnoreAttribute>() && isIgnoredViaNet5Attribute) &&
!(_serializerOptions.IgnoreReadOnlyProperties && !property.IsPubliclyWritable());
})
.OrderBy(property => property.DeclaringType.GetInheritanceChain().Length);
var dataProperties = new List<DataProperty>();
foreach (var propertyInfo in applicableProperties)
{
if (propertyInfo.HasAttribute<JsonExtensionDataAttribute>()
&& propertyInfo.PropertyType.IsConstructedFrom(typeof(IDictionary<,>), out Type constructedDictionary))
{
extensionDataType = constructedDictionary.GenericTypeArguments[1];
continue;
}
var name = propertyInfo.GetCustomAttribute<JsonPropertyNameAttribute>()?.Name
?? _serializerOptions.PropertyNamingPolicy?.ConvertName(propertyInfo.Name) ?? propertyInfo.Name;
var isSetViaConstructor = propertyInfo.DeclaringType != null && propertyInfo.DeclaringType.GetConstructors()
.SelectMany(c => c.GetParameters())
.Any(p =>
{
// STJ supports setting via constructor if either underlying OR JSON names match
return
string.Equals(p.Name, propertyInfo.Name, StringComparison.OrdinalIgnoreCase) ||
string.Equals(p.Name, name, StringComparison.OrdinalIgnoreCase);
});
dataProperties.Add(
new DataProperty(
name: name,
isRequired: false,
isNullable: propertyInfo.PropertyType.IsReferenceOrNullableType(),
isReadOnly: propertyInfo.IsPubliclyReadable() && !propertyInfo.IsPubliclyWritable() && !isSetViaConstructor,
isWriteOnly: propertyInfo.IsPubliclyWritable() && !propertyInfo.IsPubliclyReadable(),
memberType: propertyInfo.PropertyType,
memberInfo: propertyInfo));
}
return dataProperties;
}
private static readonly Dictionary<Type, Tuple<DataType, string>> PrimitiveTypesAndFormats = new Dictionary<Type, Tuple<DataType, string>>
{
[ typeof(bool) ] = Tuple.Create(DataType.Boolean, (string)null),
[ typeof(byte) ] = Tuple.Create(DataType.Integer, "int32"),
[ typeof(sbyte) ] = Tuple.Create(DataType.Integer, "int32"),
[ typeof(short) ] = Tuple.Create(DataType.Integer, "int32"),
[ typeof(ushort) ] = Tuple.Create(DataType.Integer, "int32"),
[ typeof(int) ] = Tuple.Create(DataType.Integer, "int32"),
[ typeof(uint) ] = Tuple.Create(DataType.Integer, "int32"),
[ typeof(long) ] = Tuple.Create(DataType.Integer, "int64"),
[ typeof(ulong) ] = Tuple.Create(DataType.Integer, "int64"),
[ typeof(float) ] = Tuple.Create(DataType.Number, "float"),
[ typeof(double) ] = Tuple.Create(DataType.Number, "double"),
[ typeof(decimal) ] = Tuple.Create(DataType.Number, "double"),
[ typeof(byte[]) ] = Tuple.Create(DataType.String, "byte"),
[ typeof(string) ] = Tuple.Create(DataType.String, (string)null),
[ typeof(char) ] = Tuple.Create(DataType.String, (string)null),
[ typeof(DateTime) ] = Tuple.Create(DataType.String, "date-time"),
[ typeof(DateTimeOffset) ] = Tuple.Create(DataType.String, "date-time"),
[ typeof(Guid) ] = Tuple.Create(DataType.String, "uuid"),
[ typeof(Uri) ] = Tuple.Create(DataType.String, "uri")
};
}
}