基于HttpHandler对象实现网页防盗链功能

Posted 2022-01-30 In Sec

实现思路:创建HttpHandler类，继承IHttpHandler接口

我使用的是Asp.Net Web窗体程序 创建一个Web窗体添加三张图片

        <div class="imgbox1">
            <p>
                <img src="images/1b3aa226fd7baf2ca603ba356778dc23.jpeg"/>
                <img src="images/7da87c4cbd9fdcafe29fd7cb4eeaf995.jpeg"/>
                <img src="images/ef4fbaaf38a15ffe6781647db521324e.jpeg"/>
            </p>
        </div>

样式

    <style>
        .imgbox1
            height:500px;            
        
        .imgbox1 p
            text-align:center;
        
    </style>

编写HttpHandler类

 public class PreventLink : IHttpHandler
    
        public bool IsReusable
        
            get  return true; 
        

        public void ProcessRequest(HttpContext context)
        
            
            Uri lastUrl = context.Request.UrlReferrer;
            Uri currentUrl = context.Request.Url;
            if (lastUrl.Host != currentUrl.Host || lastUrl.Port != currentUrl.Port)
            
                string errorImagePath = context.Request.PhysicalApplicationPath + "Error/default.jpg";
                context.Response.WriteFile(errorImagePath);
            
            else
            
                context.Response.WriteFile(context.Request.PhysicalPath);
            
        
    

在Web.config配置文件中添加配置文件

<system.webServer>
    <handlers>
      <add verb="*" path="images/*.jpeg" type="PreventLink" name="plink" />
    </handlers>
  </system.webServer>

在IIS中新建一个盗链网页Web,图片地址来自第一个网页的绝对地址

<p>以下内容来自盗图网,如有侵权，请联系删除,联系方法:XXXXXX</p>
            <p>
                <img src="https://localhost:44347/images/1b3aa226fd7baf2ca603ba356778dc23.jpeg"/>
                <img src="https://localhost:44347/images/7da87c4cbd9fdcafe29fd7cb4eeaf995.jpeg"/>
                <img src="https://localhost:44347/images/ef4fbaaf38a15ffe6781647db521324e.jpeg"/>
            </p>