using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Configuration;

using System.Net;

using System.Net.Http;

using System.Net.Http.Headers;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;namespace Web

{

    public partial class Test : System.Web.UI.Page

    {

        //用户id

        public string openid = "";

        //公众号信息部分

        public string appid = ConfigurationManager.AppSettings["AppId"];

        public string appsecret = ConfigurationManager.AppSettings["AppSecret"];

        public string redirect_uri = HttpUtility.UrlEncode("需返回的URL");

        #region 显示页面

        public string accesstoken;

        public string nickname;

        public string sex;

        public string headimgurl;

        public string province;

        public string country;

        public string language;

        public string city;

        public string privilege = "";

        public string errorMsg = "";

        public string errorUrl = "";

        #endregion

        protected void Page_Load(object sender, EventArgs e)

        {

            // 微信官方文档

            // https://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html

            // /* *微信认证获取openid部分： *临时认证code */

            string code = Request["code"];

            if (string.IsNullOrEmpty(code))

            {

                //判断session不存在

                if (Session["openid"] == null)

                {

                    //认证第一步：重定向跳转至认证网址

                    // 1.snsapi_base 不弹出授权页面，直接跳转，只能获取用户openid

                    string urlbase = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_base&state=123#wechat_redirect", appid, redirect_uri);

                    // 2.snsapi_userinfo （弹出授权页面，可通过openid拿到昵称、性别、所在地。并且，即使在未关注的情况下，只要用户授权，也能获取其信息）

                    string usrinfo = string.Format("https://open.weixin.qq.com/connect/oauth2/authorize?appid={0}&redirect_uri={1}&response_type=code&scope=snsapi_userinfo&state=123#wechat_redirect", appid, redirect_uri);

                    Response.Redirect(urlbase);

                }

                //判断session存在

                else

                {

                    //跳转到前端页面.aspx

                    Response.Redirect(Request.Url.ToString());

                }

                return;

            }

            //第三步 获得openid

            string url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appid, appsecret, code);

            string result = HttpHelper.GetResponse(url);

            Log.Instance.SaveLog(result);

            JObject outputObj = JObject.Parse(result);

            if (outputObj["errmsg"] != null)

            {

                errorMsg = outputObj["errmsg"].ToString();

                errorUrl = url;

                return;

            }

            accesstoken = outputObj["access_token"].ToString();

            openid = outputObj["openid"].ToString();

            GetUserInfo(openid);//通过基础接口获取数据, 不弹出授权页面

            GetUserInfo(accesstoken, openid);//通过授权页面获取信息, 会弹出确认页面,需要第一步传入userinfo

        }

        /// <summary>

        /// 通过基础接口获取用户信息

        /// </summary>

        public void GetUserInfo( string openid )

        {

            //第一步 获取基础支持access_token

            string url = string.Format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}", appid, appsecret);

            string result = HttpHelper.GetResponse(url);

            Log.Instance.SaveLog(result);

            JObject outputObj = JObject.Parse(result);

            if (outputObj["errmsg"] != null)

            {

                errorMsg = outputObj["errmsg"].ToString();

                errorUrl = url;

                return;

            }

            string token = outputObj["access_token"].ToString();

            //第二步 获取用户基本信息

            url = string.Format("https://api.weixin.qq.com/cgi-bin/user/info?access_token={0}&openid={1}", token, openid);

            result = HttpHelper.GetResponse(url);

            Log.Instance.SaveLog(result);

            outputObj = JObject.Parse(result);

            if (outputObj["errmsg"] != null)

            {

                errorMsg = outputObj["errmsg"].ToString();

                errorUrl = url;

                return;

            }

            //以下是第四步获得的信息：

            nickname = outputObj["nickname"].ToString(); //昵称

            sex = outputObj["sex"].ToString()==""?"男":"女"; //性别什么的

            headimgurl = outputObj["headimgurl"].ToString(); //头像url

            province = outputObj["province"].ToString();

            country = outputObj["country"].ToString(); ;

            language = outputObj["language"].ToString(); ;

            city = outputObj["city"].ToString(); ;

            //将获得的用户信息填入到session中

            Session["openid"] = outputObj["openid"];

        }

        /// <summary>

        /// 通过网页授权方式获取用户信息

        /// </summary>

        public void GetUserInfo(string token, string openid)

        {

            //微信认证部分：第四步 获得更多信息

            string url = string.Format("https://api.weixin.qq.com/sns/userinfo?access_token={0}&openid={1}&lang=zh_CN", accesstoken, openid);

            string result = HttpHelper.GetResponse(url);

            Log.Instance.SaveLog(result);

            JObject outputObj = JObject.Parse(result);//将json转为数组

            if (outputObj["errmsg"] != null)

            {

                errorMsg = outputObj["errmsg"].ToString();

                errorUrl = url;

                return;

            }

            //以下是第四步获得的信息：

            nickname = outputObj["nickname"].ToString(); //昵称

            sex = outputObj["sex"].ToString(); //性别什么的

            headimgurl = outputObj["headimgurl"].ToString(); //头像url

            province = outputObj["province"].ToString(); ;

            country = outputObj["country"].ToString(); ;

            language = outputObj["language"].ToString(); ;

            city = outputObj["city"].ToString(); ;

            //将获得的用户信息填入到session中

            Session["openid"] = outputObj["openid"];

            //转向回入口

            //OpenAccess();

        }

    }

}