在控制器构造的Web API读取头值 [英] Web API read header value in controller constructor

问题描述

是否有可能获得在一个web API控制器的构造函数的头信息？我想设置基于掀起了头值的变量，但我不希望有这样做对每个方法。我在自定义头值特别感兴趣，但我会满足于授权逐个这一点。我可以得到它在AuthorizationFilterAttribute工作，但我还需要在控制器级别。

  [PolicyAuthorize]
公共类PoliciesController：ApiController
{
   公共PoliciesController（）
   {
      VAR X = HttpContext.Current; //将在构造空
   }   公众的Htt presponseMessage的get（）
   {
      VAR X = HttpContext.Current; //将可用，但为时已晚
   }
}
公共类PolicyAuthorizeAttribute：AuthorizationFilterAttribute
{
    公共覆盖无效OnAuthorization（HttpActionContext ActionContext中）
    {
        VAR authHeader = actionContext.Request.Headers.Authorization; //可以在授权头在这里，但在控制器中没有HTTPActionContext
    }
}
 

解决方案

以下是你可以考虑的一些选项... preFER 1 在 2

1. 存放在当前请求消息的属性包的附加数据的Htt prequestMessage.Properties 并在控制器的便捷属性，该属性在控制器中的所有动作都可以访问

     [CustomAuthFilter]
   公共类Values​​Controller：ApiController
   {
       公共字符串名称
       {
           得到
           {
               返回Request.Properties [名称]的ToString（）。
           }
       }    公共字符串GETALL（）
       {
           返回this.Name;
       }
   }公共类CustomAuthFilter：AuthorizationFilterAttribute
   {
       公共覆盖无效OnAuthorization（HttpActionContext ActionContext中）
       {
           actionContext.Request.Properties [名称] =＆LT;从标题＆GT你的价值;
       }
   }
    




2. 您可以得到当前控制器的实例，并设置属性值。例如：

     [CustomAuthFilter]
   公共类Values​​Controller：ApiController
   {
       公共字符串名称{;组; }    公共字符串GETALL（）
       {
           返回this.Name;
       }
   }公共类CustomAuthFilter：AuthorizationFilterAttribute
   {
       公共覆盖无效OnAuthorization（HttpActionContext ActionContext中）
       {
           Values​​Controller values​​Cntlr = actionContext.ControllerContext.Controller为Values​​Controller;        如果（values​​Cntlr！= NULL）
           {
               values​​Cntlr.Name =＆LT;从标题＆GT你的价值;
           }
       }
   }
    

Is it possible to get at the header information in the constructor of a web API controller? I want to set variables based off a header value but I don't want to have to do it for each method. I'm particularly interested in a custom header value but I would settle for the Authorization one at this point. I can get it to work in an AuthorizationFilterAttribute but I also need it at the controller level.

[PolicyAuthorize]
public class PoliciesController : ApiController
{
   public PoliciesController()
   {
      var x = HttpContext.Current;  //will be null in constructor
   }

   public HttpResponseMessage Get()
   {
      var x = HttpContext.Current;  //will be available but too late
   }
}


public class PolicyAuthorizeAttribute : AuthorizationFilterAttribute
{
    public override void OnAuthorization(HttpActionContext actionContext)
    {
        var authHeader = actionContext.Request.Headers.Authorization;  //can get at Authorization header here but no HTTPActionContext in controller
    }
}

解决方案

Following are some options that you can consider...prefer 1. over 2.

1. Store additional data in current request message's properties bag HttpRequestMessage.Properties and have a convenience property in controller which all actions in the controller can access.

   [CustomAuthFilter]
   public class ValuesController : ApiController
   {
       public string Name
       {
           get
           {
               return Request.Properties["Name"].ToString();
           }
       }
   
       public string GetAll()
       {
           return this.Name;
       }
   }
   
   public class CustomAuthFilter : AuthorizationFilterAttribute
   {
       public override void OnAuthorization(HttpActionContext actionContext)
       {
           actionContext.Request.Properties["Name"] = "<your value from header>";
       }
   }
   

2. You could get the current controller's instance and set the property value. Example:

   [CustomAuthFilter]
   public class ValuesController : ApiController
   {
       public string Name { get; set; }
   
       public string GetAll()
       {
           return this.Name;
       }
   }
   
   public class CustomAuthFilter : AuthorizationFilterAttribute
   {
       public override void OnAuthorization(HttpActionContext actionContext)
       {
           ValuesController valuesCntlr = actionContext.ControllerContext.Controller as ValuesController;
   
           if (valuesCntlr != null)
           {
               valuesCntlr.Name = "<your value from header>";
           }
       }
   }
   

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