微信开放平台—网站授权微信登录功能（附带源码）

public class weixin_helper
{
public weixin_helper()
{
}
///

/// 根据AppID和AppSecret获得access token(默认过期时间为2小时)
///

/// Dictionary
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.DeserializeObjectstring, object>>(result);
return dic;
}
catch
{
return null;
}
} ///

/// 取得临时的Access Token(默认过期时间为2小时)
///

/// 临时Authorization Code
/// 防止CSRF攻击，成功授权后回调时会原样带回
/// Dictionary
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.DeserializeObjectstring, object>>(result);
return dic;
}
catch
{
return null;
}
}
///

/// 根据access_token判断access_token是否过期
///

///
/// true表示未失效
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.DeserializeObjectstring, object>>(result);
if (dic.ContainsKey("errmsg"))
{
if (dic["errmsg"].ToString()=="ok")
{
return true;
}
else
{
return false;
}
}
return false;
}
catch
{
return false;
}
}
///

/// 若fresh_token已过期则根据refresh_token取得新的refresh_token
///

/// refresh_token
/// Dictionary
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.DeserializeObjectstring, object>>(result);
return dic;
}
catch
{
return null;
}
}
///

/// 获取登录用户自己的基本资料
///

/// 临时的Access Token
/// 用户openid
/// Dictionary
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
///

/// 微信登录
///

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
}
///

/// 微信登录返回action
///

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 dic2 = weixin_helper.get_user_info(access_token,openid);
//第三步：跳转到指定页面
return Content(WeChatResultJson());
}
///

/// 微信登录返回action, 处理用户信息
///

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