504 lines
20 KiB
C#
504 lines
20 KiB
C#
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#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Globalization;
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using System.ComponentModel;
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using System.Collections.Generic;
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using LC.Newtonsoft.Json.Linq;
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using LC.Newtonsoft.Json.Utilities;
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using LC.Newtonsoft.Json.Serialization;
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#if !HAVE_LINQ
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using LC.Newtonsoft.Json.Utilities.LinqBridge;
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#else
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using System.Linq;
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#endif
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#nullable disable
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namespace LC.Newtonsoft.Json.Schema
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{
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/// <summary>
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/// <para>
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/// Generates a <see cref="JsonSchema"/> from a specified <see cref="Type"/>.
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/// </para>
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/// <note type="caution">
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/// JSON Schema validation has been moved to its own package. See <see href="https://www.newtonsoft.com/jsonschema">https://www.newtonsoft.com/jsonschema</see> for more details.
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/// </note>
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/// </summary>
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[Obsolete("JSON Schema validation has been moved to its own package. See https://www.newtonsoft.com/jsonschema for more details.")]
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public class JsonSchemaGenerator
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{
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/// <summary>
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/// Gets or sets how undefined schemas are handled by the serializer.
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/// </summary>
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public UndefinedSchemaIdHandling UndefinedSchemaIdHandling { get; set; }
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private IContractResolver _contractResolver;
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/// <summary>
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/// Gets or sets the contract resolver.
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/// </summary>
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/// <value>The contract resolver.</value>
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public IContractResolver ContractResolver
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{
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get
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{
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if (_contractResolver == null)
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{
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return DefaultContractResolver.Instance;
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}
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return _contractResolver;
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}
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set => _contractResolver = value;
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}
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private class TypeSchema
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{
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public Type Type { get; }
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public JsonSchema Schema { get; }
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public TypeSchema(Type type, JsonSchema schema)
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{
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ValidationUtils.ArgumentNotNull(type, nameof(type));
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ValidationUtils.ArgumentNotNull(schema, nameof(schema));
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Type = type;
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Schema = schema;
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}
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}
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private JsonSchemaResolver _resolver;
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private readonly IList<TypeSchema> _stack = new List<TypeSchema>();
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private JsonSchema _currentSchema;
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private JsonSchema CurrentSchema => _currentSchema;
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private void Push(TypeSchema typeSchema)
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{
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_currentSchema = typeSchema.Schema;
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_stack.Add(typeSchema);
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_resolver.LoadedSchemas.Add(typeSchema.Schema);
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}
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private TypeSchema Pop()
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{
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TypeSchema popped = _stack[_stack.Count - 1];
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_stack.RemoveAt(_stack.Count - 1);
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TypeSchema newValue = _stack.LastOrDefault();
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if (newValue != null)
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{
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_currentSchema = newValue.Schema;
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}
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else
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{
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_currentSchema = null;
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}
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return popped;
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}
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/// <summary>
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/// Generate a <see cref="JsonSchema"/> from the specified type.
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/// </summary>
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/// <param name="type">The type to generate a <see cref="JsonSchema"/> from.</param>
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/// <returns>A <see cref="JsonSchema"/> generated from the specified type.</returns>
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public JsonSchema Generate(Type type)
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{
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return Generate(type, new JsonSchemaResolver(), false);
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}
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/// <summary>
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/// Generate a <see cref="JsonSchema"/> from the specified type.
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/// </summary>
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/// <param name="type">The type to generate a <see cref="JsonSchema"/> from.</param>
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/// <param name="resolver">The <see cref="JsonSchemaResolver"/> used to resolve schema references.</param>
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/// <returns>A <see cref="JsonSchema"/> generated from the specified type.</returns>
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public JsonSchema Generate(Type type, JsonSchemaResolver resolver)
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{
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return Generate(type, resolver, false);
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}
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/// <summary>
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/// Generate a <see cref="JsonSchema"/> from the specified type.
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/// </summary>
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/// <param name="type">The type to generate a <see cref="JsonSchema"/> from.</param>
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/// <param name="rootSchemaNullable">Specify whether the generated root <see cref="JsonSchema"/> will be nullable.</param>
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/// <returns>A <see cref="JsonSchema"/> generated from the specified type.</returns>
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public JsonSchema Generate(Type type, bool rootSchemaNullable)
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{
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return Generate(type, new JsonSchemaResolver(), rootSchemaNullable);
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}
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/// <summary>
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/// Generate a <see cref="JsonSchema"/> from the specified type.
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/// </summary>
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/// <param name="type">The type to generate a <see cref="JsonSchema"/> from.</param>
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/// <param name="resolver">The <see cref="JsonSchemaResolver"/> used to resolve schema references.</param>
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/// <param name="rootSchemaNullable">Specify whether the generated root <see cref="JsonSchema"/> will be nullable.</param>
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/// <returns>A <see cref="JsonSchema"/> generated from the specified type.</returns>
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public JsonSchema Generate(Type type, JsonSchemaResolver resolver, bool rootSchemaNullable)
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{
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ValidationUtils.ArgumentNotNull(type, nameof(type));
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ValidationUtils.ArgumentNotNull(resolver, nameof(resolver));
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_resolver = resolver;
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return GenerateInternal(type, (!rootSchemaNullable) ? Required.Always : Required.Default, false);
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}
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private string GetTitle(Type type)
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{
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JsonContainerAttribute containerAttribute = JsonTypeReflector.GetCachedAttribute<JsonContainerAttribute>(type);
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if (!StringUtils.IsNullOrEmpty(containerAttribute?.Title))
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{
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return containerAttribute.Title;
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}
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return null;
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}
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private string GetDescription(Type type)
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{
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JsonContainerAttribute containerAttribute = JsonTypeReflector.GetCachedAttribute<JsonContainerAttribute>(type);
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if (!StringUtils.IsNullOrEmpty(containerAttribute?.Description))
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{
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return containerAttribute.Description;
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}
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#if HAVE_ADO_NET
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DescriptionAttribute descriptionAttribute = ReflectionUtils.GetAttribute<DescriptionAttribute>(type);
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return descriptionAttribute?.Description;
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#else
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return null;
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#endif
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}
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private string GetTypeId(Type type, bool explicitOnly)
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{
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JsonContainerAttribute containerAttribute = JsonTypeReflector.GetCachedAttribute<JsonContainerAttribute>(type);
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if (!StringUtils.IsNullOrEmpty(containerAttribute?.Id))
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{
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return containerAttribute.Id;
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}
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if (explicitOnly)
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{
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return null;
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}
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switch (UndefinedSchemaIdHandling)
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{
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case UndefinedSchemaIdHandling.UseTypeName:
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return type.FullName;
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case UndefinedSchemaIdHandling.UseAssemblyQualifiedName:
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return type.AssemblyQualifiedName;
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default:
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return null;
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}
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}
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private JsonSchema GenerateInternal(Type type, Required valueRequired, bool required)
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{
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ValidationUtils.ArgumentNotNull(type, nameof(type));
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string resolvedId = GetTypeId(type, false);
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string explicitId = GetTypeId(type, true);
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if (!StringUtils.IsNullOrEmpty(resolvedId))
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{
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JsonSchema resolvedSchema = _resolver.GetSchema(resolvedId);
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if (resolvedSchema != null)
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{
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// resolved schema is not null but referencing member allows nulls
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// change resolved schema to allow nulls. hacky but what are ya gonna do?
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if (valueRequired != Required.Always && !HasFlag(resolvedSchema.Type, JsonSchemaType.Null))
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{
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resolvedSchema.Type |= JsonSchemaType.Null;
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}
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if (required && resolvedSchema.Required != true)
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{
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resolvedSchema.Required = true;
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}
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return resolvedSchema;
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}
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}
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// test for unresolved circular reference
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if (_stack.Any(tc => tc.Type == type))
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{
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throw new JsonException("Unresolved circular reference for type '{0}'. Explicitly define an Id for the type using a JsonObject/JsonArray attribute or automatically generate a type Id using the UndefinedSchemaIdHandling property.".FormatWith(CultureInfo.InvariantCulture, type));
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}
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JsonContract contract = ContractResolver.ResolveContract(type);
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JsonConverter converter = contract.Converter ?? contract.InternalConverter;
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Push(new TypeSchema(type, new JsonSchema()));
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if (explicitId != null)
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{
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CurrentSchema.Id = explicitId;
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}
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if (required)
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{
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CurrentSchema.Required = true;
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}
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CurrentSchema.Title = GetTitle(type);
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CurrentSchema.Description = GetDescription(type);
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if (converter != null)
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{
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// todo: Add GetSchema to JsonConverter and use here?
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CurrentSchema.Type = JsonSchemaType.Any;
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}
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else
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{
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switch (contract.ContractType)
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{
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case JsonContractType.Object:
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CurrentSchema.Type = AddNullType(JsonSchemaType.Object, valueRequired);
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CurrentSchema.Id = GetTypeId(type, false);
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GenerateObjectSchema(type, (JsonObjectContract)contract);
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break;
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case JsonContractType.Array:
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CurrentSchema.Type = AddNullType(JsonSchemaType.Array, valueRequired);
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CurrentSchema.Id = GetTypeId(type, false);
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JsonArrayAttribute arrayAttribute = JsonTypeReflector.GetCachedAttribute<JsonArrayAttribute>(type);
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bool allowNullItem = (arrayAttribute == null || arrayAttribute.AllowNullItems);
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Type collectionItemType = ReflectionUtils.GetCollectionItemType(type);
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if (collectionItemType != null)
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{
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CurrentSchema.Items = new List<JsonSchema>();
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CurrentSchema.Items.Add(GenerateInternal(collectionItemType, (!allowNullItem) ? Required.Always : Required.Default, false));
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}
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break;
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case JsonContractType.Primitive:
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CurrentSchema.Type = GetJsonSchemaType(type, valueRequired);
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if (CurrentSchema.Type == JsonSchemaType.Integer && type.IsEnum() && !type.IsDefined(typeof(FlagsAttribute), true))
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{
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CurrentSchema.Enum = new List<JToken>();
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EnumInfo enumValues = EnumUtils.GetEnumValuesAndNames(type);
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for (int i = 0; i < enumValues.Names.Length; i++)
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{
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ulong v = enumValues.Values[i];
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JToken value = JToken.FromObject(Enum.ToObject(type, v));
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CurrentSchema.Enum.Add(value);
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}
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}
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break;
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case JsonContractType.String:
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JsonSchemaType schemaType = (!ReflectionUtils.IsNullable(contract.UnderlyingType))
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? JsonSchemaType.String
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: AddNullType(JsonSchemaType.String, valueRequired);
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CurrentSchema.Type = schemaType;
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break;
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case JsonContractType.Dictionary:
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CurrentSchema.Type = AddNullType(JsonSchemaType.Object, valueRequired);
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Type keyType;
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Type valueType;
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ReflectionUtils.GetDictionaryKeyValueTypes(type, out keyType, out valueType);
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if (keyType != null)
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{
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JsonContract keyContract = ContractResolver.ResolveContract(keyType);
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// can be converted to a string
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if (keyContract.ContractType == JsonContractType.Primitive)
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{
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CurrentSchema.AdditionalProperties = GenerateInternal(valueType, Required.Default, false);
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}
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}
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break;
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#if HAVE_BINARY_SERIALIZATION
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case JsonContractType.Serializable:
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CurrentSchema.Type = AddNullType(JsonSchemaType.Object, valueRequired);
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CurrentSchema.Id = GetTypeId(type, false);
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GenerateISerializableContract(type, (JsonISerializableContract)contract);
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break;
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#endif
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#if HAVE_DYNAMIC
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case JsonContractType.Dynamic:
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#endif
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case JsonContractType.Linq:
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CurrentSchema.Type = JsonSchemaType.Any;
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break;
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default:
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throw new JsonException("Unexpected contract type: {0}".FormatWith(CultureInfo.InvariantCulture, contract));
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}
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}
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return Pop().Schema;
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}
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private JsonSchemaType AddNullType(JsonSchemaType type, Required valueRequired)
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{
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if (valueRequired != Required.Always)
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{
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return type | JsonSchemaType.Null;
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}
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return type;
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}
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private bool HasFlag(DefaultValueHandling value, DefaultValueHandling flag)
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{
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return ((value & flag) == flag);
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}
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private void GenerateObjectSchema(Type type, JsonObjectContract contract)
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{
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CurrentSchema.Properties = new Dictionary<string, JsonSchema>();
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foreach (JsonProperty property in contract.Properties)
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{
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if (!property.Ignored)
|
||
|
|
{
|
||
|
|
bool optional = property.NullValueHandling == NullValueHandling.Ignore ||
|
||
|
|
HasFlag(property.DefaultValueHandling.GetValueOrDefault(), DefaultValueHandling.Ignore) ||
|
||
|
|
property.ShouldSerialize != null ||
|
||
|
|
property.GetIsSpecified != null;
|
||
|
|
|
||
|
|
JsonSchema propertySchema = GenerateInternal(property.PropertyType, property.Required, !optional);
|
||
|
|
|
||
|
|
if (property.DefaultValue != null)
|
||
|
|
{
|
||
|
|
propertySchema.Default = JToken.FromObject(property.DefaultValue);
|
||
|
|
}
|
||
|
|
|
||
|
|
CurrentSchema.Properties.Add(property.PropertyName, propertySchema);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (type.IsSealed())
|
||
|
|
{
|
||
|
|
CurrentSchema.AllowAdditionalProperties = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#if HAVE_BINARY_SERIALIZATION
|
||
|
|
private void GenerateISerializableContract(Type type, JsonISerializableContract contract)
|
||
|
|
{
|
||
|
|
CurrentSchema.AllowAdditionalProperties = true;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
internal static bool HasFlag(JsonSchemaType? value, JsonSchemaType flag)
|
||
|
|
{
|
||
|
|
// default value is Any
|
||
|
|
if (value == null)
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool match = ((value & flag) == flag);
|
||
|
|
if (match)
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// integer is a subset of float
|
||
|
|
if (flag == JsonSchemaType.Integer && (value & JsonSchemaType.Float) == JsonSchemaType.Float)
|
||
|
|
{
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
private JsonSchemaType GetJsonSchemaType(Type type, Required valueRequired)
|
||
|
|
{
|
||
|
|
JsonSchemaType schemaType = JsonSchemaType.None;
|
||
|
|
if (valueRequired != Required.Always && ReflectionUtils.IsNullable(type))
|
||
|
|
{
|
||
|
|
schemaType = JsonSchemaType.Null;
|
||
|
|
if (ReflectionUtils.IsNullableType(type))
|
||
|
|
{
|
||
|
|
type = Nullable.GetUnderlyingType(type);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
PrimitiveTypeCode typeCode = ConvertUtils.GetTypeCode(type);
|
||
|
|
|
||
|
|
switch (typeCode)
|
||
|
|
{
|
||
|
|
case PrimitiveTypeCode.Empty:
|
||
|
|
case PrimitiveTypeCode.Object:
|
||
|
|
return schemaType | JsonSchemaType.String;
|
||
|
|
#if HAVE_DB_NULL_TYPE_CODE
|
||
|
|
case PrimitiveTypeCode.DBNull:
|
||
|
|
return schemaType | JsonSchemaType.Null;
|
||
|
|
#endif
|
||
|
|
case PrimitiveTypeCode.Boolean:
|
||
|
|
return schemaType | JsonSchemaType.Boolean;
|
||
|
|
case PrimitiveTypeCode.Char:
|
||
|
|
return schemaType | JsonSchemaType.String;
|
||
|
|
case PrimitiveTypeCode.SByte:
|
||
|
|
case PrimitiveTypeCode.Byte:
|
||
|
|
case PrimitiveTypeCode.Int16:
|
||
|
|
case PrimitiveTypeCode.UInt16:
|
||
|
|
case PrimitiveTypeCode.Int32:
|
||
|
|
case PrimitiveTypeCode.UInt32:
|
||
|
|
case PrimitiveTypeCode.Int64:
|
||
|
|
case PrimitiveTypeCode.UInt64:
|
||
|
|
#if HAVE_BIG_INTEGER
|
||
|
|
case PrimitiveTypeCode.BigInteger:
|
||
|
|
#endif
|
||
|
|
return schemaType | JsonSchemaType.Integer;
|
||
|
|
case PrimitiveTypeCode.Single:
|
||
|
|
case PrimitiveTypeCode.Double:
|
||
|
|
case PrimitiveTypeCode.Decimal:
|
||
|
|
return schemaType | JsonSchemaType.Float;
|
||
|
|
// convert to string?
|
||
|
|
case PrimitiveTypeCode.DateTime:
|
||
|
|
#if HAVE_DATE_TIME_OFFSET
|
||
|
|
case PrimitiveTypeCode.DateTimeOffset:
|
||
|
|
#endif
|
||
|
|
return schemaType | JsonSchemaType.String;
|
||
|
|
case PrimitiveTypeCode.String:
|
||
|
|
case PrimitiveTypeCode.Uri:
|
||
|
|
case PrimitiveTypeCode.Guid:
|
||
|
|
case PrimitiveTypeCode.TimeSpan:
|
||
|
|
case PrimitiveTypeCode.Bytes:
|
||
|
|
return schemaType | JsonSchemaType.String;
|
||
|
|
default:
|
||
|
|
throw new JsonException("Unexpected type code '{0}' for type '{1}'.".FormatWith(CultureInfo.InvariantCulture, typeCode, type));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|