MVC跨域CORS扩展

CORS的原理:

     CORS定义一种跨域访问的机制,可以让AJAX实现跨域访问。CORS 允许一个域上的网络应用向另一个域提交跨域 AJAX 请求。实现此功能非常简单,只需由服务器发送一个响应标头即可。
     context.HttpContext.Response.AppendHeader("Access-Control-Allow-Origin", origin);

针对ASP.NET MVC,cors跨域访问,只需要在web.config中添加如下的内容即可

<system.webServer>

<httpProtocol>

<customHeaders>

<add name="Access-Control-Allow-Origin" value="*" />

<add name="Access-Control-Allow-Headers" value="Content-Type" />

<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />

</customHeaders>

</httpProtocol>

<handlers>

<remove name="ExtensionlessUrlHandler-Integrated-4.0" />

<remove name="OPTIONSVerbHandler" />

<remove name="TRACEVerbHandler" />

<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

</handlers>

</system.webServer>

 

但是这种全局设置存在局限性,因为你无法有选择性的设置可以跨域访问你本站的站点,所以就想到能不能通过特性标记控制器,或者标记控制器中的方法来设置跨域访问权限。

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Web;
 5 using System.Web.Mvc;
 6 
 7 namespace IocTEST.Common
 8 {
 9     public class AllowOriginAttribute
10     {
11         public static void onExcute(ControllerContext context, string[] AllowSites)
12         {
13             var origin = context.HttpContext.Request.Headers["Origin"];
14             Action action = () =>
15             {
16                 context.HttpContext.Response.AppendHeader("Access-Control-Allow-Origin", origin);
17 
18             };
19             if (AllowSites != null && AllowSites.Any())
20             {
21                 if (AllowSites.Contains(origin))
22                 {
23                     action();
24                 }
25             }
26             
27 
28         }
29     }
30 
31     public class ActionAllowOriginAttribute : ActionFilterAttribute
32     {
33         public string[] AllowSites { get; set; }
34         public override void OnActionExecuting(System.Web.Mvc.ActionExecutingContext filterContext)
35         {
36             AllowOriginAttribute.onExcute(filterContext, AllowSites);
37             base.OnActionExecuting(filterContext);
38         }
39     }
40     public class ControllerAllowOriginAttribute : AuthorizeAttribute
41     {
42         public string[] AllowSites { get; set; }
43         public override void OnAuthorization(System.Web.Mvc.AuthorizationContext filterContext)
44         {
45             AllowOriginAttribute.onExcute(filterContext, AllowSites);
46         }
47 
48     }
49 
50 
51   
52 }
基于控制器和方法的跨域访问设置
 1  [ControllerAllowOrigin(AllowSites = new string[] { "http://www.cnblogs.com" })]
 2     public class HomeController : Controller
 3     {
 4 
 5     
 6         public JsonResult Test()
 7         {
 8             return Json(new { name = "aaa" }, JsonRequestBehavior.AllowGet);
 9         }
10 
11    }
12 
13  
14 
15  
16 
17   public class HomeController : Controller
18     {
19 
20         [ActionAllowOrigin(AllowSites = new string[] { "http://www.cnbeta.com" })]
21         public JsonResult Test()
22         {
23             return Json(new { name = "aaa" }, JsonRequestBehavior.AllowGet);
24         }
25 
26    }
调用代码

 

测试的时候,可以将需要跨域访问你本地localhost站点的网站打开,然后F12打开firebug,在console里面输入$.post('http://localhost:80/',{},function(){})或者

$.get('http://localhost:80/',{},function(){})  观察请求状态。

posted @ 2016-08-23 00:38  smileyearn  阅读(358)  评论(0编辑  收藏  举报