using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.ComponentModel;

​

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

using Newtonsoft.Json.Schema; //https://www.newtonsoft.com/jsonschema/help/html/Introduction.htm

using Newtonsoft.Json.Schema.Generation;

​

//using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/79225896/custom-schema-validation-rules-with-jsonvalidator-executing-only-if-the-value

​

internal class CustomNameRuleValidator : JsonValidator

{

    const string CustomRulePropertyName = "customNameRule";

​

    public override bool CanValidate(JSchema schema) =>

        schema.ExtensionData.ContainsKey(CustomRulePropertyName);

​

    public override void Validate(JToken value, JsonValidatorContext context)

    {

        var customRuleValue = (string)context.Schema.ExtensionData[CustomRulePropertyName];

        if (value.Type != JTokenType.String || !((string)value).StartsWith(customRuleValue))

            context.RaiseError($"Property value {value.ToString(Formatting.None)} does not begin with {customRuleValue}");

    }

}

​

internal class CustomValueTypeRuleValidator : JsonValidator

{

    const string CustomRulePropertyName = "customValueTypeRule";

    readonly JSchema customValueSchema;

    readonly string expectedValueType;

​

    public CustomValueTypeRuleValidator(string expectedValueType) => 

        (this.expectedValueType, this.customValueSchema) = (expectedValueType, JSchema.Parse($"{{ 'type': '{expectedValueType}' }}"));

​

    // For simplicity of the example

    public override bool CanValidate(JSchema schema) =>

        schema.ExtensionData.ContainsKey(CustomRulePropertyName);

​

    public override void Validate(JToken value, JsonValidatorContext context)

    {

        if (value is JObject obj)

        {

            var valueToken = obj["value"];

            if (valueToken == null || !valueToken.IsValid(customValueSchema))

            {

                context.RaiseError($"Type mismatch, expected {expectedValueType}");

            }       

        }

    }

}

​

    class TestClass

    {

        public static void Test()

        {

            var customNameRuleSchemaJson = 

                """

                {

                    "description":"A configuration setting value",

                    "type":"object",

                    "properties":{

                        "name":{

                            "allOf":[

                                // The standard validation rules

                                {

                                    "type":"string",

                                },

                                // Your custom rule

                                {

                                    "customNameRule" : "Setting",

                                }

                            ]

                        },

                        "value":true

                    },

                    "required": ["name", "value"],

                }

                """;

​

            Test(customNameRuleSchemaJson);

​

            Console.WriteLine();

            var schemaJson2 = 

                """

                {

                    "allOf":[

                        {

                           "description":"A configuration setting value",

                           "type":"object",

                           "properties":{

                              "name":{

                                 "type":"string",

                              },

                              "value":true

                           },

                           "required": ["name", "value"],

                        },

                        {

                            "customValueTypeRule" : true,

                        },

                    ]

                }

                """;

            Test(schemaJson2);

        }

        public static void Test(string schemaJson)

        {

​

            var settingJson = @"{ 'name': 'AA', 'value': 'XYZ' }";

            var setting = JToken.Parse(settingJson);

​

            var readerSettings = new JSchemaReaderSettings

            {

                Validators = [new CustomNameRuleValidator(), new CustomValueTypeRuleValidator("number")]

            };

​

            var schema = JSchema.Parse(schemaJson, readerSettings);

            var isValid = setting.IsValid(schema, out IList<string> errors);

​

            Console.WriteLine(setting.ToString(Formatting.None));

            Console.WriteLine(schema);

            Console.WriteLine();

​

            Console.WriteLine(

                "IsValid={0}, Errors:\r\n{1}",

                isValid,

                errors != null ? string.Join("\r\n", errors) : string.Empty);

​

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine("Json.NET Schema version: " + typeof(Newtonsoft.Json.Schema.JSchema).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​

#if false

internal class ValueTypeValidator : JsonValidator

{

    // For simplicity of the example

    public override bool CanValidate(JSchema schema)

    {

        return false;

    }

​

    public override void Validate(JToken value, JsonValidatorContext context)

    {

        if (value.Type == JTokenType.Object)

        {

            var obj = (JObject)value;

​

            var name = (string)obj["name"];

            var type = GetExpectedValueType(name);

            var schema = JSchema.Parse($@"{{ 'type': '{type}' }}");

​

            var valueToken = obj["value"];

            if (!valueToken.IsValid(schema))

            {

                context.RaiseError($"Type mismatch, expected {type}");

            }

        }

    }

​

    private string GetExpectedValueType(string name)

    {

        // Here I need to select the correct settings group

        // based on the context of the JSON instance being validated.

        //return SettingsRegistry.SettingsGroup2[name];

        return "Foo";

    }

}

#endif

​