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, 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;
      }
    }
  }

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, 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);
        }
      }
    }      

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