画像の盗難防止

 1     public class ProtectImgHandler:IHttpHandler

 2     {

 3         public bool IsReusable

 4         {

 5             get { return false; }

 6         }

 7 

 8         public void ProcessRequest(HttpContext context)

 9         {

10             context.Request.ContentType = "image/JPEG";

11             //  

12             string FileName = context.Server.MapPath(context.Request.FilePath);

13             //  UrlReferrer ， 

14             if (context.Request.UrlReferrer.Host == null)

15             {

16                 context.Response.WriteFile("~/img/error.jpg");

17             }

18             else {

19                 //  UrlReferrer ， 

20                 if (context.Request.UrlReferrer.Host.IndexOf("localhost") > -1)

21                 {

22                     context.Response.WriteFile(FileName);

23                 }

24                 else {

25                     context.Response.WriteFile("~/img/error.jpg");

26                 }

27             }

28         }

29 

30             //  Web.config 

31       <httpHandlers>

32          <add verb="*" path="*.jpg" type="Picture.ProtectImgHandler"/>

33      </httpHandlers>