微信开发笔记——微信网页登录授权,获取用户信息

原文: 微信开发笔记——微信网页登录授权,获取用户信息

微信网页授权,获取用户的微信官方API文档地址:
http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html

三次握手
微信认证流程(我自己简称三次握手):
1、用户同意授权,获取code
2、通过code换取网页授权access_token,用户openId等信息
3、通过access_token和用户的openId获取该用户的用户信息

思路:
经过研究,我这边的思路是:让所有页面都继承同一个页面,在这个页面里做微信登录授权处理,
因为第一步必须要经过微信的登录授权,不能网页后端请求,所以先要经过用户同意,通过页面网页请求组装的微信请求链接。请求该链接,
获取code后,后端模拟请求。获取用户信息。

微信三次握手的方法(代码)

public class WeiXinOAuth

{

    /// <summary>

    /// 获取微信Code

    /// </summary>

    /// <param name="appId"></param>

    /// <param name="appSecret"></param>

    /// <param name="redirectUrl"></param>

    public string GetWeiXinCode(string appId,string appSecret,string redirectUrl)

    {

        Random r = new Random();

        //微信登录授权

        //string url = "https://open.weixin.qq.com/connect/qrconnect?appid=" + appId + "&redirect_uri=" + redirectUrl +"&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";

        //微信OpenId授权

        //string url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appId + "&redirect_uri=" + redirectUrl +"&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";

        //微信用户信息授权

        string url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + appId + "&redirect_uri=" + redirectUrl + "&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect";



        return url;

    }

    /// <summary>

    /// 通过code获取access_token

    /// </summary>

    /// <param name="appId"></param>

    /// <param name="appSecret"></param>

    /// <param name="code"></param>

    /// <returns></returns>

    public Model.WeiXinAccessTokenResult GetWeiXinAccessToken(string appId,string appSecret,string code)

    {

        string url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+appId+"&secret="+appSecret+

            "&code="+ code + "&grant_type=authorization_code";

        string jsonStr = Tools.GetHttpRequest(url);



        Model.WeiXinAccessTokenResult result = new Model.WeiXinAccessTokenResult();

        if (jsonStr.Contains("errcode"))

        {

            Model.WeiXinErrorMsg errorResult = new Model.WeiXinErrorMsg();

            errorResult=JsonHelper.ParseFromJson<Model.WeiXinErrorMsg>(jsonStr);

            result.ErrorResult = errorResult;

            result.Result = false;

        }

        else

        {

            Model.WeiXinAccessTokenModel model = new Model.WeiXinAccessTokenModel();

            model = JsonHelper.ParseFromJson<Model.WeiXinAccessTokenModel>(jsonStr);

            result.SuccessResult = model;

            result.Result = true;

        }

        return result;

    }

    /// <summary>

    /// 拉取用户信息

    /// </summary>

    /// <param name="accessToken"></param>

    /// <param name="openId"></param>

    /// <returns></returns>

    public Model.WeiXinUserInfoResult GetWeiXinUserInfo(string accessToken,string openId)

    {

        string url = "https://api.weixin.qq.com/sns/userinfo?access_token="+accessToken+"&openid="+openId+"&lang=zh_CN";



        string jsonStr = Tools.GetHttpRequest(url);

        Model.WeiXinUserInfoResult result = new Model.WeiXinUserInfoResult();

        if(jsonStr.Contains("errcode"))

        {

            Model.WeiXinErrorMsg errorResult = new Model.WeiXinErrorMsg();

            errorResult = JsonHelper.ParseFromJson<Model.WeiXinErrorMsg>(jsonStr);

            result.ErrorMsg = errorResult;

            result.Result = false;

        }

        else

        {

            Model.WeiXinUserInfo userInfo = new Model.WeiXinUserInfo();

            userInfo = JsonHelper.ParseFromJson<Model.WeiXinUserInfo>(jsonStr);

            result.UserInfo = userInfo;

            result.Result = true;

        }

        return result;

    }

}

所需要的对应实体类

WeiXinAccessTokenResult 类:

public class WeiXinAccessTokenResult

{

    public WeiXinAccessTokenModel SuccessResult { get; set; }

    public bool Result { get; set; }



    public WeiXinErrorMsg ErrorResult { get; set; }



}
View Code
WeiXinAccessTokenModel类:
/// <summary>

/// 通过code获取access_token 请求成功的实体

/// </summary>

public class WeiXinAccessTokenModel

{

    /// <summary>

    /// 接口调用凭证

    /// </summary>

    public string access_token { get; set; }

    /// <summary>

    /// access_token接口调用凭证超时时间,单位(秒)

    /// </summary>

    public int expires_in { get; set; }

    /// <summary>

    /// 用户刷新access_token

    /// </summary>

    public string refresh_token { get; set; }

    /// <summary>

    /// 授权用户唯一标识

    /// </summary>

    public string openid { get; set; }

    /// <summary>

    /// 用户授权的作用域,使用逗号(,)分隔

    /// </summary>

    public string scope { get; set; }

}
View Code
WeiXinErrorMsg类:
/// <summary>

/// 微信错误访问的情况 

/// </summary>

public class WeiXinErrorMsg

{

    /// <summary>

    /// 错误编号

    /// </summary>

    public int errcode { get; set; }

    /// <summary>

    /// 错误提示消息

    /// </summary>

    public string errmsg { get; set; }

}
View Code
WeiXinUserInfoResult类:
 
/// <summary>

/// 获取微信用户信息

/// </summary>

public class WeiXinUserInfoResult

{

    /// <summary>

    /// 微信用户信息

    /// </summary>

    public WeiXinUserInfo UserInfo { get; set; }

    /// <summary>

    /// 结果

    /// </summary>

    public bool Result { get; set; }

    /// <summary>

    /// 错误信息

    /// </summary>

    public WeiXinErrorMsg ErrorMsg { get; set; }

}
View Code
WeiXinUser 类 :
public class WeiXinUserInfo

{

    /// <summary>

    /// 用户的唯一标识

    /// </summary>

    public string openid { get; set; }

    /// <summary>

    /// 用户昵称

    /// </summary>

    public string nickname { get; set; }

    /// <summary>

    /// 用户的性别,值为1时是男性,值为2时是女性,值为0时是未知

    /// </summary>

    public string sex { get; set; }

    /// <summary>

    /// 用户个人资料填写的省份

    /// </summary>

    public string province { get; set; }

    /// <summary>

    /// 普通用户个人资料填写的城市

    /// </summary>

    public string city { get; set; }

    /// <summary>

    /// 国家,如中国为CN

    /// </summary>

    public string country { get; set; }

    /// <summary>

    /// 用户头像,最后一个数值代表正方形头像大小(有0、46、64、96、132数值可选,0代表640*640正方形头像),用户没有头像时该项为空

    /// </summary>

    public string headimgurl { get; set; }

    /// <summary>

    /// 用户特权信息,json 数组,如微信沃卡用户为(chinaunicom)

    /// </summary>

    public string[] privilege { get; set; }

}
View Code
所有的页面,都会继承BasePage页面,这样方便处理,继承这个页面的其他页面就不需要考虑认证的问题了。
public partial class BasePage : System.Web.UI.Page

{

    public BasePage()

    {

        this.Page.Load += new EventHandler(Page_Load);

        this.Page.Unload += new EventHandler(Page_UnLoad);

    }

    protected void Page_Load(object sender, EventArgs e)

    {

        DoWith();

    }



    protected void Page_UnLoad(object sender, EventArgs e)

    {

    }

    private void DoWith()

    {

        //用户尚未登录

        if (BLL.UserInfoManager.Instance().GetUserId() <= 0)

        {

            //获取appId,appSecret的配置信息

            string appId = System.Configuration.ConfigurationSettings.AppSettings["appid"];

            string appSecret = System.Configuration.ConfigurationSettings.AppSettings["secret"];

            Core.WeiXinOAuth weixinOAuth = new WeiXinOAuth();

            //微信第一次握手后得到的code 和state

            string _code = Cmn.Request.Get("code");

            string _state = Cmn.Request.Get("state");



            if (_code == "" || _code == "authdeny")

            {

                if (_code == "")

                {

                    //发起授权(第一次微信握手)

                    string _authUrl = weixinOAuth.GetWeiXinCode(appId, appSecret, HttpContext.Current.Server.UrlEncode(HttpContext.Current.Request.Url.ToString()));

                    HttpContext.Current.Response.Redirect(_authUrl, true);

                }

                else

                { // 用户取消授权

                    HttpContext.Current.Response.Redirect("~/Error.html", true);

                }

            }

            else

            {

                //获取微信的Access_Token(第二次微信握手)

                Core.Model.WeiXinAccessTokenResult modelResult = weixinOAuth.GetWeiXinAccessToken(appId, appSecret, _code);



                //获取微信的用户信息(第三次微信握手)

                Core.Model.WeiXinUserInfoResult _userInfo = weixinOAuth.GetWeiXinUserInfo(modelResult.SuccessResult.access_token,modelResult.SuccessResult.openid);



                //用户信息(判断是否已经获取到用户的微信用户信息)

                if (_userInfo.Result && _userInfo.UserInfo.openid != "")

                {

                    //保存获取到的用户微信用户信息,并保存到数据库中

                }

                else

                {

                    GameTradingByPublic.ExceptionLog.writeFile(2, "获取用户OpenId失败");

                }

            }

        }

    }

}

 

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