微信开放平台之网站授权微信登录功能

public class weixin_helper {  public weixin_helper()  {  }  /// <summary>  /// 根据AppID和AppSecret获得access token(默认过期时间为2小时)  /// </summary>  /// <returns>Dictionary</returns>  public static Dictionary<string, object> get_access_token()  {   //获得配置信息   oauth_config config = oauth_helper.get_config(2);   string send_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" +        config.oauth_app_id + "&secret=" + config.oauth_app_key + "";   //发送并接受返回值   string result = Utils.HttpGet(send_url);   if (result.Contains("errmsg"))   {    return null;   }   try   {    Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);    return dic;   }   catch   {    return null;   }  } /// <summary>  /// 取得临时的Access Token(默认过期时间为2小时)  /// </summary>  /// <param name="code">临时Authorization Code</param>  /// <param name="state">防止CSRF攻击，成功授权后回调时会原样带回</param>  /// <returns>Dictionary</returns>  public static Dictionary<string, object> get_access_token(string code, string state)  {   //获得配置信息   oauth_config config = oauth_helper.get_config(2);   string send_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" +        config.oauth_app_id + "&secret=" + config.oauth_app_key + "&code="+code+"&grant_type=authorization_code";   //发送并接受返回值   string result = Utils.HttpGet(send_url);   if (result.Contains("errmsg"))   {    return null;   }   try   {    Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);    return dic;   }   catch   {    return null;   }  }  /// <summary>  /// 根据access_token判断access_token是否过期  /// </summary>  /// <param name="access_token"></param>  /// <returns>true表示未失效</returns>  public static bool check_access_token(string access_token)  {   //获得配置信息   oauth_config config = oauth_helper.get_config(2);   string send_url = "https://api.weixin.qq.com/sns/auth?access_token=" + access_token + "&openid=" + config.oauth_app_id;   //发送并接受返回值   string result = Utils.HttpGet(send_url);   try   {    Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);    if (dic.ContainsKey("errmsg"))    {     if (dic["errmsg"].ToString()=="ok")     {      return true;     }     else     {      return false;     }    }    return false;   }   catch   {    return false;   }  }  /// <summary>  /// 若fresh_token已过期则根据refresh_token取得新的refresh_token  /// </summary>  /// <param name="refresh_token">refresh_token</param>  /// <returns>Dictionary</returns>  public static Dictionary<string, object> get_refresh_token(string refresh_token)  {   //获得配置信息   oauth_config config = oauth_helper.get_config(2);   string send_url =    "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" +        config.oauth_app_id + "&grant_type=refresh_token&refresh_token=" + refresh_token;   //发送并接受返回值   string result = Utils.HttpGet(send_url);   if (result.Contains("errmsg"))   {    return null;   }   try   {    Dictionary<string, object> dic = JsonConvert.DeserializeObject<Dictionary<string, object>>(result);    return dic;   }   catch   {    return null;   }  }  /// <summary>  /// 获取登录用户自己的基本资料  /// </summary>  /// <param name="access_token">临时的Access Token</param>  /// <param name="open_id">用户openid</param>  /// <returns>Dictionary</returns>  public static Dictionary<string, object> get_user_info(string access_token, string open_id)  {   //获得配置信息   oauth_config config = oauth_helper.get_config(2);   //发送并接受返回值    string send_url = "https://api.weixin.qq.com/sns/userinfo?access_token="+access_token+"&openid="+open_id;   //发送并接受返回值   string result = Utils.HttpGet(send_url);   if (result.Contains("errmsg"))   {    return null;   }   //反序列化JSON   Dictionary<string, object> dic = JsonHelper.DataRowFromJSON(result);   return dic;  } }

#region 微信登录  /// <summary>  /// 微信登录  /// </summary>  public ActionResult WeChat()  {   //获得配置信息   oauth_config config = oauth_helper.get_config(2); //主键id   if (config == null)   {    return Content("出错了，您尚未配置微信相关的API信息！");   }   string state = Guid.NewGuid().ToString().Replace("-", "");   Session["oauth_state"] = state;   string send_url =    "https://open.weixin.qq.com/connect/qrconnect?appid=" + config.oauth_app_id +        "&redirect_uri=" + Utils.UrlEncode(config.return_uri.ToLower()) +        "&response_type=code&scope=snsapi_login&state=" + state +        "#wechat_redirect";   //开始发送   return Redirect(send_url); //跳转到微信自己 指定的关联登陆页面  }  /// <summary>  /// 微信登录返回action  /// </summary>  public ActionResult WeChatReturnUrl(string state, string code)  {   //取得返回参数   string access_token = string.Empty;   string expires_in = string.Empty;   string client_id = string.Empty;   string openid = string.Empty;   string refresh_token = string.Empty;   if (Session["oauth_state"] == null || Session["oauth_state"].ToString() == "" ||    state != Session["oauth_state"].ToString() || string.IsNullOrEmpty(code))//若返回参数中未包含code或者state没有通过验证则提示出错   {    return Content("出错啦，state未初始化！");   }   //第一步：通过code来获取Access Token以及openid   Dictionary<string, object> dic1 = weixin_helper.get_access_token(code, state);   if (dic1 == null || !dic1.ContainsKey("access_token"))   {    return Content("错误代码：，无法获取Access Token，请检查App Key是否正确！");   }   if (dic1 == null || !dic1.ContainsKey("openid"))   {    if (dic1.ContainsKey("errmsg"))    {     return Content("errcode：" + dic1["errcode"] + ",errmsg：" + dic1["errmsg"]);    }    else    {     return Content("出错啦，无法获取用户授权Openid！");    }   }   access_token = dic1["access_token"].ToString();//获取access_token   expires_in = dic1["expires_in"].ToString();//获取过期时间   refresh_token = dic1["refresh_token"].ToString();//获取用于重新刷新access_token的凭证   openid = dic1["openid"].ToString();//用户唯一标示openid   //储存获取数据用到的信息   Session["oauth_name"] = "webchat";   Session["oauth_access_token"] = access_token;   Session["oauth_openid"] = openid;   Session["oauth_refresh_token"] = refresh_token;   #region todo 将获取到的用户信息保存到数据库中   #endregion   //第二步：通过Access Token以及openid来获取用户的基本信息   //Dictionary<string, object> dic2 = weixin_helper.get_user_info(access_token,openid);   //第三步：跳转到指定页面   return Content(WeChatResultJson());  }  /// <summary>  /// 微信登录返回action, 处理用户信息  /// </summary>  public string WeChatResultJson()  {   string oauth_access_token = string.Empty;   string oauth_openid = string.Empty;   string oauth_name = string.Empty;   string oauth_refresh_token = string.Empty;   if (Session["oauth_name"] == null || Session["oauth_access_token"] == null ||    Session["oauth_openid"] == null)   {    return "{/"ret/":/"1/", /"msg/":/"出错啦，Access Token已过期或不存在！/"}";   }   oauth_name = Session["oauth_name"].ToString();   oauth_access_token = Session["oauth_access_token"].ToString();   oauth_openid = Session["oauth_openid"].ToString();   oauth_refresh_token = Session["oauth_refresh_token"].ToString();   if (!weixin_helper.check_access_token(oauth_access_token)) //调用access_token前需判断是否过期   {    Dictionary<string, object> dic1 = weixin_helper.get_refresh_token(oauth_refresh_token);//如果已过期则重新换取新的access_token    if (dic1 == null || !dic1.ContainsKey("access_token"))    {     return "{/"openid/":/"0/", /"msg/":/"出错啦，无法获取access_token！/"}";    }    oauth_access_token = dic1["access_token"].ToString();   }   Dictionary<string, object> dic = weixin_helper.get_user_info(oauth_access_token, oauth_openid);   if (dic == null)   {    return "{/"openid/":/"0/", /"msg/":/"出错啦，无法获取授权用户信息！/"}";   }   try   {    StringBuilder str = new StringBuilder();    str.Append("{");    str.Append("/"openid/": /"" + dic["openid"].ToString() + "/", ");    str.Append("/"nickname/": /"" + dic["nickname"].ToString() + "/", ");    str.Append("/"sex/": /"" + dic["sex"].ToString() + "/", ");    str.Append("/"province/": /"" + dic["province"].ToString() + "/", ");    str.Append("/"city/": /"" + dic["city"].ToString() + "/", ");    str.Append("/"country/": /"" + dic["country"].ToString() + "/", ");    str.Append("/"headimgurl/": /"" + dic["headimgurl"].ToString() + "/", ");    str.Append("/"privilege/": /"" + dic["privilege"].ToString() + "/", ");    str.Append("/"unionid/": /"" + dic["unionid"].ToString() + "/"");    str.Append("/"oauth_name/": /"" + oauth_name + "/"");    str.Append("/"oauth_access_token/": /"" + oauth_access_token + "/"");    str.Append("/"oauth_openid/": /"" + oauth_openid + "/"");    str.Append("}");    return str.ToString();   }   catch   {    return "{/"ret/":/"0/", /"msg/":/"出错啦，无法获取授权用户信息！/"}";   }  }  #endregion