ASP.NET MVC 微信公共平台开发

验证消息的真实性

1. 在MVC Controller所在项目中添加过滤器，在过滤器中重写

   public override void OnActionExecuting(ActionExecutingContext filterContext)方法

1. 新建数据模型

   

   注：服务器接收消息时，不再是signature而是msg_signature

   微信服务器推送消息到服务器的HTTP请求报文示例 

   POST /cgi-bin/wxpush? msg_signature=477715d11cdb4164915debcba66cb864d751f3e6&timestamp=1409659813&nonce=1372623149 HTTP/1.1

   Host: qy.weixin.qq.com

    

2. 方法重写，实现对消息的验证

   调用微信接入时验证的方法，不过参数需要小改动一下，采用新建的数据模型

    

   

    

   

3. 在Action方法或在Controller上添加过滤器属性

    

   

4. 代码示例
   

       /// <summary>
         /// 微信推送消息模型
        /// </summary>
         public class WeChatMsgRequestModel
         {
             public string timestamp { get; set; }
             public string nonce { get; set; }
     
             public string msg_signature { get; set; }
        }

   Model
   
   

    
    public class WeChatRequestValidAttribute : ActionFilterAttribute
         {
             private const string Token = "StupidMe";
     
             public override void OnActionExecuting(ActionExecutingContext filterContext)
             {
                 //参数适配
                 Model.FormatModel.WeChatMsgRequestModel model = new Model.FormatModel.WeChatMsgRequestModel() { nonce= filterContext.HttpContext.Request.QueryString["nonce"],msg_signature= filterContext.HttpContext.Request.QueryString["msg_signature"],timestamp= filterContext.HttpContext.Request.QueryString["timestamp"] };
                //验证
                if (CheckSignature(model))
                {
                    base.OnActionExecuting(filterContext);
                }            
            }
    
            private bool CheckSignature(Model.FormatModel.WeChatMsgRequestModel model)
            {
                string signature, timestamp, nonce, tempStr;
                //获取请求来的参数
                signature = model.msg_signature;
                timestamp = model.timestamp;
                nonce = model.nonce;
                //创建数组，将 Token, timestamp, nonce 三个参数加入数组
                string[] array = { Token, timestamp, nonce };
                //进行排序
                Array.Sort(array);
                //拼接为一个字符串
                tempStr = String.Join("", array);
                //对字符串进行 SHA1加密
                tempStr = FormsAuthentication.HashPasswordForStoringInConfigFile(tempStr, "SHA1").ToLower();
                //判断signature 是否正确
                if (tempStr.Equals(signature))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }
   

    
          Filter

             /// <summary>
             /// 日志助手
             /// </summary>
             private static Common.LogHelper logger = new Common.LogHelper(typeof(HomeController));
     
             [Filters.WeChatRequestValid]
             public void Valid(Model.FormatModel.WeChatMsgRequestModel model)
             {
                if (ModelState.IsValid)
                {
                    try
                    {
                        //判断是否是POST请求
                        if (HttpContext.Request.HttpMethod.ToUpper() == "POST")
                        {
                            //从请求的数据流中获取请求信息
                            using (Stream stream = HttpContext.Request.InputStream)
                            {
                                byte[] postBytes = new byte[stream.Length];
                                stream.Read(postBytes, 0, (int)stream.Length);
                                string postString = System.Text.Encoding.UTF8.GetString(postBytes);
                                Handle(postString,model);
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        logger.Error("发生异常,异常信息：" + ex.Message + ex.StackTrace);
                    }
                }
            }            

   Controller Code