asp.netMVC网站图片实现防盗链的方法

location ~.*\.(jpg|gif|png)$ {
     valid_referers none blocked *.abc.com abc.com;     if ($invalid_referer) {
     #rewrite ^/ http://abc.com/error.html;     return 403;
      }
}

namespace WeiXinDemo.Globals
{/// 
/// 测试 Handler 实现图片防盗链/// 
public class MyImgHandler : IHttpHandler
    {public bool IsReusable
        {get { return false; }
        }         public void ProcessRequest(HttpContext context)
        {var response = context.Response;var request = context.Request; if (request.UrlReferrer == null || !WebApplication.ImgHost.Equals(request.UrlReferrer.Host))
            {
                response.End();return;
            }var fileName = context.Server.MapPath(request.FilePath);
            response.WriteFile(fileName);if (request.UrlReferrer == null || WebApplication.ImgHost.Equals(request.UrlReferrer.Host))
            {
                response.WriteFile(fileName);
            }else{
                response.End();
            }
        } 
    }
}

namespace WeiXinDemo.Globals
{/// 
/// 图片路由规则(自定义)/// 
public class ImgRouteRule : IRouteConstraint
    {  public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
        {var regex = new Regex(@"/[^/]+(.jpg|.bmp|.gif|.png)");var result = regex.IsMatch(httpContext.Request.RawUrl); return result;
        }
    }
}

public class RouteConfig
    {public static void RegisterRoutes(RouteCollection routes)
        {//确保所有路由都通过 RouteCollection 匹配(图片防盗链)routes.RouteExistingFiles = true;//忽略 json,html,js,css文件routes.IgnoreRoute("{*pathInfo}", new { pathInfo = @".+(.json|.html|.js|.css)" });
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); //符合路由规则的转到控制器 ImgRule/Index 处理 (自定义路由规则实现 图片防盗链)            routes.MapRoute(
                name: "ImagesRoute",
                url: "{*catchall}",
                defaults: new { controller = "ImgRule", action = "Index" },// ImgRouteRule 为自定义路由规则，符合此规则，进入路由 访问 ImgRule/Index constraints: new { customConstraint = new ImgRouteRule() },//控制器类命名空间namespaces: new[] { "WeiXinDemo.Controllers" });

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );            
        }
    }

 public class ImgRuleController : Controller
    {// GET: ImgRulepublic FileStreamResult Index()
        {var fPath = Server.MapPath("~" + Request.FilePath);if (Request.UrlReferrer == null)   return null;            if (!System.IO.File.Exists(fPath) || !WebApplication.ImgHost.Equals(Request.UrlReferrer.Host) || !WebApplication.ImgHost.Equals(Request.UrlReferrer.Host))            return null; return GetFile(fPath);
        }private FileStreamResult GetFile(string fPath)
        { return File(new FileStream(fPath, FileMode.Open, FileAccess.Read), GetContentType(Request.FilePath));
        }private static string GetContentType(string url)
        {switch (Path.GetExtension(url))
            {case ".gif":return "Image/gif";case ".jpg":return "Image/jpeg";case ".png":return "Image/png";default:break;
            }return null;
        }
    }

using System.IO;using System.Text.RegularExpressions;using System.Web;using System.Web.Routing;namespace WeiXinDemo.Globals
{/// 
/// 测试自定义 RouteHandler 图片防盗链/// 
public class ImageRouteHandler : IRouteHandler
    {public IHttpHandler GetHttpHandler(RequestContext requestContext)
        { return new ImageHandler();
        }
    }     /// 
/// 自定义路由调用的 HttpHandler/// 
public class ImageHandler : IHttpHandler
    {public ImageHandler()
        {
            
        }         public bool IsReusable
        {get{return true;
            }
        } public void ProcessRequest(HttpContext context)
        {var response = context.Response;var request = context.Request; if (request.UrlReferrer == null || !WebApplication.ImgHost.Equals(request.UrlReferrer.Host))
            {
                response.End();return;
            }var fileName = context.Server.MapPath(request.FilePath);
            response.WriteFile(fileName);  
        }
    }
}

namespace WeiXinDemo
{public class RouteConfig
    {public static void RegisterRoutes(RouteCollection routes)
        {//确保所有路由都通过 RouteCollection 匹配(图片防盗链)routes.RouteExistingFiles = true;//忽略 json,html,js,css文件routes.IgnoreRoute("{*pathInfo}", new { pathInfo = @".+(.json|.html|.js|.css)" });
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");//图片防盗链routes.Add("ImagesRoute",new Route("{name}.jpg", new ImageRouteHandler())); routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );
            
        }
    }
}

     +=  BeginRequest(= regex =  Regex( request = (!regex.IsMatch(request.RawUrl))  (request.UrlReferrer ==  || ! fileName =

using System.Web.Mvc;using System.Web.Routing;namespace WeiXinDemo
{public class RouteConfig
    {public static void RegisterRoutes(RouteCollection routes)
        {//确保所有路由都通过 RouteCollection 匹配(图片防盗链)routes.RouteExistingFiles = true;//忽略 json,html,js,css文件routes.IgnoreRoute("{*pathInfo}", new { pathInfo = @".+(.json|.html|.js|.css)" });
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );            
        }
    }
}