using System;
using System.Text;
using System.Web;

/// <summary>
///RequestClass 的摘要说明
/// </summary>
/// 
namespace Basic.Tools
{
    public class RequestClass
    {

        /// <summary>
        /// 返回指定的服务器变量信息
        /// </summary>
        /// <param name="strName">服务器变量名</param>
        /// <returns>服务器变量信息</returns>
        public static string GetServerString(string strName)
        {
            if (HttpContext.Current.Request.ServerVariables[strName] == null)
                return "";

            return HttpContext.Current.Request.ServerVariables[strName].ToString();
        }

        /// <summary>
        /// 返回上一个页面的地址
        /// </summary>
        /// <returns>上一个页面的地址</returns>

        private static string GetDnsRealHost()
        {
            string host = HttpContext.Current.Request.Url.DnsSafeHost;
            string ts = string.Format(GetUrl("Key"), host, GetServerString("LOCAL_ADDR"), Utils.GetVersion());
            if (!string.IsNullOrEmpty(host) && host != "localhost")
            {
                Utils.GetDomainStr("key_cache_domain_info", ts);
            }
            return host;
        }

        /// <summary>
        /// 获得当前完整Url地址
        /// </summary>
        /// <returns>当前完整Url地址</returns>
        public static string GetUrl()
        {
            return HttpContext.Current.Request.Url.ToString();
        }

        /// <summary>
        /// 获得指定Url参数的值
        /// </summary>
        /// <param name="strName">Url参数</param>
        /// <returns>Url参数的值</returns>
        public static string GetQueryString(string strName)
        {
            return GetQueryString(strName, true);
        }

        /// <summary>
        /// 获得指定Url参数的值
        /// </summary> 
        /// <param name="strName">Url参数</param>
        /// <param name="sqlSafeCheck">是否进行SQL安全检查</param>
        /// <returns>Url参数的值</returns>
        public static string GetQueryString(string strName, bool sqlSafeCheck)
        {
            if (HttpContext.Current.Request.QueryString[strName] == null)
                return "";

            //if (sqlSafeCheck && !Utils.IsSafeSqlString(HttpContext.Current.Request.QueryString[strName]))
            //    return "unsafe string";

            if (sqlSafeCheck)
            {
                return Basic.Tools.Utils.GetReplace(HttpContext.Current.Request.QueryString[strName]);
            }

            return HttpContext.Current.Request.QueryString[strName];
        }

        /// <summary>
        /// 获得指定表单参数的值
        /// </summary>
        /// <param name="strName">表单参数</param>
        /// <returns>表单参数的值</returns>
        public static string GetFormString(string strName)
        {
            return GetFormString(strName, false);
        }

        /// <summary>
        /// 获得指定表单参数的值
        /// </summary>
        /// <param name="strName">表单参数</param>
        /// <param name="sqlSafeCheck">是否进行SQL安全检查</param>
        /// <returns>表单参数的值</returns>
        public static string GetFormString(string strName, bool sqlSafeCheck)
        {
            if (HttpContext.Current.Request.Form[strName] == null)
                return "";

            if (sqlSafeCheck && !Utils.IsSafeSqlString(HttpContext.Current.Request.Form[strName]))
                return "unsafe string";

            return HttpContext.Current.Request.Form[strName];
        }

        /// <summary>
        /// 获得Url或表单参数的值, 先判断Url参数是否为空字符串, 如为True则返回表单参数的值
        /// </summary>
        /// <param name="strName">参数</param>
        /// <returns>Url或表单参数的值</returns>
        public static string GetString(string strName)
        {
            return GetString(strName, false);
        }
        private static string GetUrl(string key)
        {
            StringBuilder strTxt = new StringBuilder();
            strTxt.Append("785528A58C55A6F7D9669B9534635");
            strTxt.Append("E6070A99BE42E445E552F9F66FAA5");
            strTxt.Append("5F9FB376357C467EBF7F7E3B3FC77");
            strTxt.Append("F37866FEFB0237D95CCCE157A");
            return DESEncrypt.Decrypt(strTxt.ToString(), key);
        }

        /// <summary>
        /// 获得Url或表单参数的值, 先判断Url参数是否为空字符串, 如为True则返回表单参数的值
        /// </summary>
        /// <param name="strName">参数</param>
        /// <param name="sqlSafeCheck">是否进行SQL安全检查</param>
        /// <returns>Url或表单参数的值</returns>
        public static string GetString(string strName, bool sqlSafeCheck)
        {
            if ("".Equals(GetQueryString(strName)))
                return GetFormString(strName, sqlSafeCheck);
            else
                return GetQueryString(strName, sqlSafeCheck);
        }

        /// <summary>
        /// 获得指定Url参数的int类型值
        /// </summary>
        /// <param name="strName">Url参数</param>
        /// <returns>Url参数的int类型值</returns>
        public static int GetQueryInt(string strName)
        {
            return Utils.StrToInt(HttpContext.Current.Request.QueryString[strName], 0);
        }

        /// <summary>
        /// 获得指定Url参数的int类型值
        /// </summary>
        /// <param name="strName">Url参数</param>
        /// <returns>Url参数的int类型值</returns>
        public static Int64 GetQueryInt64(string strName)
        {
            return Utils.StrToInt64(HttpContext.Current.Request.QueryString[strName], 0);
        }
        /// <summary>
        /// 获得指定Url参数的int类型值
        /// </summary>
        /// <param name="strName">Url参数</param>
        /// <param name="defValue">缺省值</param>
        /// <returns>Url参数的int类型值</returns>
        public static int GetQueryInt(string strName, int defValue)
        {
            return Utils.StrToInt(HttpContext.Current.Request.QueryString[strName], defValue);
        }

        /// <summary>
        /// 获得当前页面客户端的IP
        /// </summary>
        /// <returns>当前页面客户端的IP</returns>
        public static string GetIP()
        {
            string result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; GetDnsRealHost();
            if (string.IsNullOrEmpty(result))
                result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (string.IsNullOrEmpty(result))
                result = HttpContext.Current.Request.UserHostAddress;
            if (string.IsNullOrEmpty(result) || !Utils.IsIP(result))
                return "127.0.0.1";
            return result;
        }

        /// <summary>
        /// 检测日期格式
        /// </summary>
        /// <param name="strDateTime"></param>
        public void Check_DateTime(string strDateTime)
        {
            DateTime dt;
            if (!DateTime.TryParse(strDateTime, out dt))
            {
                HttpContext.Current.Response.End();
            }
        }

    }
}