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asp.net core中间件预防防止xss攻击

news 2025/6/23 22:11:50

using System;
using System.Text.Json;
using System.Text.Json.Serialization;namespace CommonUtils
{/// <summary>/// newtonsoft的转化器/// 防止xss攻击/// </summary>public class AntiXssNewtonsoftConverter : Newtonsoft.Json.JsonConverter<string>{/// <summary>/// 读取的时候/// 就是输入的时候进行处理/// </summary>/// <param name="reader"></param>/// <param name="objectType"></param>/// <param name="existingValue"></param>/// <param name="hasExistingValue"></param>/// <param name="serializer"></param>/// <returns></returns>public override string ReadJson(Newtonsoft.Json.JsonReader reader, Type objectType, string existingValue, bool hasExistingValue, Newtonsoft.Json.JsonSerializer serializer){//多次解码无影响，防止输出的时候多次编码导致字符串乱码var res = System.Web.HttpUtility.HtmlDecode(reader.Value.ToString());//进行编码res = System.Web.HttpUtility.HtmlEncode(res);return res;}/// <summary>/// 写出的时候/// 也可以在写出的时候进行，这里演示的写入的时候，到时候反过来就行了/// </summary>/// <param name="writer"></param>/// <param name="value"></param>/// <param name="serializer"></param>public override void WriteJson(Newtonsoft.Json.JsonWriter writer, string value, Newtonsoft.Json.JsonSerializer serializer){writer.WriteValue(value);}/*全局使用services.AddControllers().AddNewtonsoftJson(options=>{options.SerializerSettings.Converters.Add(new AntiXssSystemTextConverter());});某个属性使用[JsonConverter(typeof(AntiXssNewtonsoftConverter))]public string? Id { get; set; }*/}/// <summary>/// system.text.json转化器/// 原理同newtonsoft，主要是看web项目使用的是那个json序列化工具/// </summary>public class AntiXssSystemTextConverter : JsonConverter<string>{/// <summary>/// 读取的时候/// </summary>/// <param name="reader"></param>/// <param name="typeToConvert"></param>/// <param name="options"></param>/// <returns></returns>/// <exception cref="NotImplementedException"></exception>public override string Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options){//多次解码无影响，防止输出的时候多次编码导致字符串乱码var res = System.Web.HttpUtility.HtmlDecode(reader.GetString());//进行编码res = System.Web.HttpUtility.HtmlEncode(res);return res;}/// <summary>/// 写出的时候/// </summary>/// <param name="writer"></param>/// <param name="value"></param>/// <param name="options"></param>/// <exception cref="NotImplementedException"></exception>public override void Write(Utf8JsonWriter writer, string value, JsonSerializerOptions options){writer.WriteStringValue(value);}/*全局使用services.AddControllers().AddJsonOptions(options=>{options.JsonSerializerOptions.Converters.Add(new AntiXssSystemTextConverter());});某个属性使用[JsonConverter(typeof(AntiXssSystemTextConverter))]public string? Id { get; set; }*/}
}