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基于C#后台调用跨域MVC服务及带Cookie验证的实现

2020-01-24 03:24:21
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背景
随着富客户端框架的盛行,以及众多优秀的前端js框架,很多情况我们会遇到跨域的问题,而js的ajax请求是不允许直接跨域访问的,当然你会说可以用JSONP等,但是由于代码洁癖,不想在前端和后台添加callback,而且很多情况你是无法控制的,需要牵连考虑太多的情况。

所以我直接绕过了,每个前端应用,自带一个通用后端服务代理,该服务解决跨域问题,自动代理帮前台获取跨域的数据。

如何算跨域
虽然是个老问题,但是还是要提醒注意下两点:同IP,不同端口,数据访问是跨域的,但是Cookie访问是可以的(这个让我很难理解)

解决,源码

复制代码 代码如下:

    CookieContainer cookieContainer = new CookieContainer();

     [HttpPost]
        public string CommonPost(string url)
        {
            log.Info(CookieHelper.GetCookie("ITDC_UserName") + "进入方法CommonPost Url=" + url);
            Uri address = new Uri(System.Configuration.ConfigurationManager.AppSettings["RESTfulAPI"].ToString() + url);
            HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
       //远程服务,需要加入cookie验证
            cookieContainer.Add(address, GetCookie("ITDC_UserName"));
            cookieContainer.Add(address, GetCookie("ITDC_UserRole"));
            request.CookieContainer = cookieContainer;
            StringBuilder data = new StringBuilder();
            for (int i = 0; i < Request.QueryString.Count; i++)
            {
                if (Request.QueryString.Keys[i].ToString() == "url") continue;
                data.Append("&" + Request.QueryString.Keys[i].ToString() + "=" + Request.QueryString[i].ToString());
            }
            // Create a byte array of the data we want to send
            byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString().TrimStart('&'));
            // Set the content length in the request headers
            request.ContentLength = byteData.Length;
            // Write data 
            using (Stream postStream = request.GetRequestStream())
            {
                postStream.Write(byteData, 0, byteData.Length);
            } 
            string result = "";
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {
                StreamReader reader = new StreamReader(response.GetResponseStream());
                result = reader.ReadToEnd();
            }
            log.Info(CookieHelper.GetCookie("ITDC_UserName") + " 执行完成 CommonPost Url=" + url);
            return (result);
        }


前台调用
复制代码 代码如下:

Ext.Ajax.request({url: APIUrl + '/Nebula/CommonPost?url=/Nebula/PostComment/&KlId=1&Msg=ok&Author=admin&Title=文章标题',
                  method: "POST",
                  success: function (response) {
                              Ext.Viewport.unmask();
                              var obj = Ext.decode(response.responseText);
                              Ext.Msg.alert("提示", obj.Msg, Ext.emptyFn);
                           },
                  failure: function (response) {
                              Ext.Viewport.unmask();
                              Ext.Msg.alert("提示", "操作失败,请检查网络!", Ext.emptyFn);
                           }
});

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