c# - 如何在asp.net核心的IActionFilter中更改请求正文

问题描述

目前我正在向 asp.net 核心控制器发送加密请求。以下是请求正文结构：

{
  "body": "pEbXVvl1ue95eGQywK/q80cGHjYk+2VNPYEgnRgU+vI="
}

在此之前我已经实现了过滤器IActionFilter，所以在OnActionExecuting(ActionExecutingContext context)我解密上面提到的请求正文（正文密钥）的地方

解密后，我得到了解密后的请求体，如下所示：

{
  "Urno":"URN123456"
}

解密后，我想将解密后的请求（上面提到的"Urno":"URN123456"）主体传递给控制器

我曾尝试将字符串转换为字节而不是将其传递给Request.body但没有成功：

public void OnActionExecuting(ActionExecutingContext context)
{
    var request = context.HttpContext.Request;
    request.EnableRewind();
    request.Body.Position = 0;
    using (var reader = new StreamReader(request.Body))
    {                   
        var bodyString = reader.ReadToEnd(); //{ "body": "pEbXVvl1ue95eGQywK/q80cGHjYk+2VNPYEgnRgU+vI="}
        if (bodyString != "")
        {
             var data = JObject.Parse(bodyString);
             var key = data.GetValue("body"); 
             var keybytes = Encoding.UTF8.GetBytes("808080808080808011");
             var iv = Encoding.UTF8.GetBytes("8080808080808080111");
             var encrypted = Convert.FromBase64String(key.ToString());
             var decriptedFromJavascript = DecryptStringFromBytes(encrypted, keybytes, iv); //{ "Urno":"URN123456"}
             byte[] bytes = Encoding.ASCII.GetBytes(decriptedFromJavascript);
             request.Body = new MemoryStream(bytes); // here i am trying to change request body
        }
    }
}
   // controller
[HttpPost("[action]")]
public async Task<string> GetInvestorUrno(Urnoinvestor InfoReq){

}


// class
public class Urnoinvestor 
{
    public string Urno{ get; set; }
}

我想更改请求正文并将解密的请求传递给控制器

标签： c#asp.net-core

解决方案

对于您的情况，IActionFilter将无法正常工作。检查此图像：

在Model binding之前运行，ActionFilter这意味着无论您对 body 进行什么更改，它都不会更改模型。您需要在模型绑定之前尝试过滤器，例如Resource filter.

改成Resource filter

public class RequestBodyFilter : IResourceFilter
{
    public void OnResourceExecuted(ResourceExecutedContext context)
    {
        //throw new NotImplementedException();
    }

    public void OnResourceExecuting(ResourceExecutingContext context)
    {
        var request = context.HttpContext.Request;
        request.EnableRewind();
        request.Body.Position = 0;
        using (var reader = new StreamReader(request.Body))
        {
            var decriptedFromJavascript = "{ \"Urno\":\"URN123456\"}"; //{ "Urno":"URN123456"}
            byte[] bytes = Encoding.ASCII.GetBytes(decriptedFromJavascript);
            request.Body = new MemoryStream(bytes); // here i am trying to change request body
        }
    }
}

由于您是从正文绑定的，因此您需要[FromBody]根据@Tony Abrams 的建议指定操作。

[HttpPost("[action]")]
[TypeFilter(typeof(RequestBodyFilter))]
public async Task<string> GetInvestorUrno([FromBody]Urnoinvestor InfoReq)
{
    return InfoReq.Urno;
}

c# - 如何在asp.net核心的IActionFilter中更改请求正文

问题描述

解决方案

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