asp.net 自定义HttpModule，添加HTTP协议的基本认证（HTTP Basic Authorization）

using System;
using System.Web;
using System.Text;
namespace HttpFiles
{

    public class RoutingModule : IHttpModule
    {


        public void Dispose()
        {

        }
        
        public void Init(HttpApplication context)
        {
            //注册自定义请求时间
            context.BeginRequest += new EventHandler(context_myRequest);
        }
        void context_myRequest(object sender, EventArgs e)
        {
            HttpApplication ap = sender as HttpApplication;
            HttpContextBase context = new HttpContextWrapper(ap.Context);
            this.context_doRequest(context);
        }

        public virtual void context_doRequest(HttpContextBase context)
        {
            //获取请求头中的Authorization Base64加密后的用户名和密码
            String authorization = HttpContext.Current.Request.Headers["authorization"];
            
            //验证用户和密码
            if (!string.IsNullOrEmpty(authorization))
            {

                string[] authorizationString = authorization.Split(' ');

                if (authorizationString.Length == 2)
                {

                    String base64String = authorizationString[1];
                    String accountString = Base64Util.Base64Decode(Encoding.UTF8, base64String);

                    //获取服务端用户名和密码进行作对比，此处写法简单用于测试，正式应用可以与数据库进行交互进行验证
                    string userpass = System.Configuration.ConfigurationManager.AppSettings.Get("authUser");
                    if (accountString == userpass)
                    {
                        return;
                    }
                }
            }

            //未认证则返回401登录认证界面
            HttpContext.Current.Response.StatusCode = 401;
            HttpContext.Current.Response.Status = "401 未认证的请求";
            HttpContext.Current.Response.AddHeader("WWW-Authenticate", "Basic realm=\"STOP!\"");
            HttpContext.Current.Response.End();
        }
    }


    /// <summary>
    /// 第二种方法：使用自定义http handler 
    /// </summary>
    public class myhandler : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            string FileName = context.Server.MapPath(context.Request.FilePath);
            if (context.Request.UrlReferrer == null || context.Request.UrlReferrer.Host == null)
            {
                context.Response.ContentType = "image/JPEG";
                context.Response.WriteFile("~/no.gif");
            }
            else
            {
                if (context.Request.UrlReferrer != null && (context.Request.UrlReferrer.Host.IndexOf("localhost") > -1))
                {
                    context.Response.ContentType = "image/JPEG";
                    context.Response.WriteFile(FileName);
                }
                else
                {
                    context.Response.ContentType = "image/JPEG";
                    context.Response.WriteFile("~/no.gif");
                }
            }
        }
        public bool IsReusable
        {
            get { return true; }
        }
        public myhandler()
        {
        }
    }
}

第二步：添加组件的注册引用，把上边创建的列，添加进去

 效果查看