C# · 12月 28, 2021

asp.net开发微信公众平台之验证消息的真实性

验证消息的真实性

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

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

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

在Action方法或在Controller上添加过滤器属性

代码示例

Model

/// <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; } }

Filter

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,nonce 三个参数加入数组 string[] array = { Token,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; } } }

Controller Code

/// <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,(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); } } }

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