看此代码求解释！

Question

 public class login : IHttpHandler
    {
        public void ProcessRequest(HttpContext context)
        {
            //验证用户名密码
            string loginName = context.Request.Form["loginName"];
            base64 b6 = new base64();
            string password = b6.decodeBase64(context.Request.Form["password"]);

            loginReturn lr = new loginReturn();

            int userId = SSO.Operate.ValidateUserInfo(loginName, password);
            if (userId > 0)
            {
                SSORequest ssorequest = new SSORequest();
                //获取用户Model，并将相应的值赋给SSORequest
                if (Authentication.CreateAppToken(ssorequest))
                {
                    lr.userId = userId;
                    lr.AA_Token = ssorequest.AA_Token;
                    context.Response.Write(JsonHelper.JsonSerializer(lr));
                }
            }
            lr.userId = -1;
            lr.AA_Token = "";
            context.Response.Write(JsonHelper.JsonSerializer(lr));
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

Answer 1

你哪些地方看不懂？