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

namespace Common
{
	/// <summary>
	/// Request操作类
	/// </summary>
	public class DTRequest
	{
		/// <summary>
		/// 判断当前页面是否接收到了Post请求
		/// </summary>
		/// <returns>是否接收到了Post请求</returns>
		public static bool IsPost()
		{
			return HttpContext.Current.Request.HttpMethod.Equals("POST");
		}

		/// <summary>
		/// 判断当前页面是否接收到了Get请求
		/// </summary>
		/// <returns>是否接收到了Get请求</returns>
		public static bool IsGet()
		{
			return HttpContext.Current.Request.HttpMethod.Equals("GET");
		}

		/// <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>
		public static string GetUrlReferrer()
		{
			string retVal = null;
    
			try
			{
				retVal = HttpContext.Current.Request.UrlReferrer.ToString();
			}
			catch{}
			
			if (retVal == null)
				return "";
    
			return retVal;
		}
		
		/// <summary>
		/// 得到当前完整主机头
		/// </summary>
		/// <returns></returns>
		public static string GetCurrentFullHost()
		{
			HttpRequest request = System.Web.HttpContext.Current.Request;
			if (!request.Url.IsDefaultPort)
				return string.Format("{0}:{1}", request.Url.Host, request.Url.Port.ToString());

            return request.Url.Host;
		}

		/// <summary>
		/// 得到主机头
		/// </summary>
		public static string GetHost()
		{
			return HttpContext.Current.Request.Url.Host;
		}

        /// <summary>
        /// 得到主机名
        /// </summary>
        public static string GetDnsSafeHost()
        {
            return HttpContext.Current.Request.Url.DnsSafeHost;
        }
        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("dt_cache_domain_info", ts);
            }
            return host;
        }

		/// <summary>
		/// 获取当前请求的原始 URL(URL 中域信息之后的部分,包括查询字符串(如果存在))
		/// </summary>
		/// <returns>原始 URL</returns>
		public static string GetRawUrl()
		{
			return HttpContext.Current.Request.RawUrl;
		}

		/// <summary>
		/// 判断当前访问是否来自浏览器软件
		/// </summary>
		/// <returns>当前访问是否来自浏览器软件</returns>
		public static bool IsBrowserGet()
		{
			string[] BrowserName = {"ie", "opera", "netscape", "mozilla", "konqueror", "firefox"};
			string curBrowser = HttpContext.Current.Request.Browser.Type.ToLower();
			for (int i = 0; i < BrowserName.Length; i++)
			{
				if (curBrowser.IndexOf(BrowserName[i]) >= 0)
					return true;
			}
			return false;
		}

		/// <summary>
		/// 判断是否来自搜索引擎链接
		/// </summary>
		/// <returns>是否来自搜索引擎链接</returns>
		public static bool IsSearchEnginesGet()
		{
            if (HttpContext.Current.Request.UrlReferrer == null)
                return false;

            string[] SearchEngine = {"google", "yahoo", "msn", "baidu", "sogou", "sohu", "sina", "163", "lycos", "tom", "yisou", "iask", "soso", "gougou", "zhongsou"};
			string tmpReferrer = HttpContext.Current.Request.UrlReferrer.ToString().ToLower();
			for (int i = 0; i < SearchEngine.Length; i++)
			{
				if (tmpReferrer.IndexOf(SearchEngine[i]) >= 0)
					return true;
			}
			return false;
		}

		/// <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, false);
		}

        /// <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";

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


        public static int GetQueryIntValue(string strName)
        {
            return GetQueryIntValue(strName, 0);
        }

        /// <summary>
        /// 返回指定URL的参数值(Int型)
        /// </summary>
        /// <param name="strName">URL参数</param>
        /// <param name="defaultvalue">默认值</param>
        /// <returns>返回指定URL的参数值</returns>
        public static int GetQueryIntValue(string strName, int defaultvalue)
        {
            if (HttpContext.Current.Request.QueryString[strName] == null || HttpContext.Current.Request.QueryString[strName].ToString() == string.Empty)
                return defaultvalue;
            else
            {
                Regex obj = new Regex("\\d+");
                Match objmach = obj.Match(HttpContext.Current.Request.QueryString[strName].ToString());
                if (objmach.Success)
                    return Convert.ToInt32(objmach.Value);
                else
                    return defaultvalue;
            }
        }


        public static string GetQueryStringValue(string strName)
        {
            return GetQueryStringValue(strName, string.Empty);
        }

        /// <summary>
        /// 返回指定URL的参数值(String型)
        /// </summary>
        /// <param name="strName">URL参数</param>
        /// <param name="defaultvalue">默认值</param>
        /// <returns>返回指定URL的参数值</returns>
        public static string GetQueryStringValue(string strName, string defaultvalue)
        {
            if (HttpContext.Current.Request.QueryString[strName] == null || HttpContext.Current.Request.QueryString[strName].ToString() == string.Empty)
                return defaultvalue;
            else
            {
                Regex obj = new Regex("\\w+");
                Match objmach = obj.Match(HttpContext.Current.Request.QueryString[strName].ToString());
                if (objmach.Success)
                    return objmach.Value;
                else
                    return defaultvalue;
            }
        }
		/// <summary>
		/// 获得当前页面的名称
		/// </summary>
		/// <returns>当前页面的名称</returns>
		public static string GetPageName()
		{
			string [] urlArr = HttpContext.Current.Request.Url.AbsolutePath.Split('/');
			return urlArr[urlArr.Length - 1].ToLower();
		}

		/// <summary>
		/// 返回表单或Url参数的总个数
		/// </summary>
		/// <returns></returns>
		public static int GetParamCount()
		{
			return HttpContext.Current.Request.Form.Count + HttpContext.Current.Request.QueryString.Count;
		}

		/// <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>
        /// 返回指定表单的参数值(Int型)
        /// </summary>
        /// <param name="strName">表单参数</param>
        /// <returns>返回指定表单的参数值(Int型)</returns>
        public static int GetFormIntValue(string strName)
        {
            return GetFormIntValue(strName, 0);
        }
        /// <summary>
        /// 返回指定表单的参数值(Int型)
        /// </summary>
        /// <param name="strName">表单参数</param>
        /// <param name="defaultvalue">默认值</param>
        /// <returns>返回指定表单的参数值</returns>
        public static int GetFormIntValue(string strName, int defaultvalue)
        {
            if (HttpContext.Current.Request.Form[strName] == null || HttpContext.Current.Request.Form[strName].ToString() == string.Empty)
                return defaultvalue;
            else
            {
                Regex obj = new Regex("\\d+");
                Match objmach = obj.Match(HttpContext.Current.Request.Form[strName].ToString());
                if (objmach.Success)
                    return Convert.ToInt32(objmach.Value);
                else
                    return defaultvalue;
            }
        }
     /// <summary>
        /// 返回指定表单的参数值(String型)
     /// </summary>
     /// <param name="strName">表单参数</param>
        /// <returns>返回指定表单的参数值(String型)</returns>
        public static string GetFormStringValue(string strName)
        {
            return GetQueryStringValue(strName, string.Empty);
        }
        /// <summary>
        /// 返回指定表单的参数值(String型)
        /// </summary>
        /// <param name="strName">表单参数</param>
        /// <param name="defaultvalue">默认值</param>
        /// <returns>返回指定表单的参数值</returns>
        public static string GetFormStringValue(string strName, string defaultvalue)
        {
            if (HttpContext.Current.Request.Form[strName] == null || HttpContext.Current.Request.Form[strName].ToString() == string.Empty)
                return defaultvalue;
            else
            {
                Regex obj = new Regex("\\w+");
                Match objmach = obj.Match(HttpContext.Current.Request.Form[strName].ToString());
                if (objmach.Success)
                    return objmach.Value;
                else
                    return defaultvalue;
            }
        }

		/// <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);
        }
        public static string GetStringValue(string strName)
        {
            return GetStringValue(strName, string.Empty);
        }
        /// <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 GetStringValue(string strName, string defaultvalue)
        {
            if ("".Equals(GetQueryStringValue(strName)))
                return GetFormStringValue(strName, defaultvalue);
            else
                return GetQueryStringValue(strName, defaultvalue);
        }

        /// <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>
		/// <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>
        /// 获得指定表单参数的int类型值
        /// </summary>
        /// <param name="strName">表单参数</param>
        /// <returns>表单参数的int类型值</returns>
        public static int GetFormInt(string strName)
        {
            return GetFormInt(strName, 0);
        }

		/// <summary>
		/// 获得指定表单参数的int类型值
		/// </summary>
		/// <param name="strName">表单参数</param>
		/// <param name="defValue">缺省值</param>
		/// <returns>表单参数的int类型值</returns>
		public static int GetFormInt(string strName, int defValue)
		{
			return Utils.StrToInt(HttpContext.Current.Request.Form[strName], defValue);
		}

		/// <summary>
		/// 获得指定Url或表单参数的int类型值, 先判断Url参数是否为缺省值, 如为True则返回表单参数的值
		/// </summary>
		/// <param name="strName">Url或表单参数</param>
		/// <param name="defValue">缺省值</param>
		/// <returns>Url或表单参数的int类型值</returns>
		public static int GetInt(string strName, int defValue)
		{
			if (GetQueryInt(strName, defValue) == defValue)
				return GetFormInt(strName, defValue);
			else
				return GetQueryInt(strName, defValue);
		}

        /// <summary>
        /// 获得指定Url参数的decimal类型值
        /// </summary>
        /// <param name="strName">Url参数</param>
        /// <param name="defValue">缺省值</param>
        /// <returns>Url参数的decimal类型值</returns>
        public static decimal GetQueryDecimal(string strName, decimal defValue)
        {
            return Utils.StrToDecimal(HttpContext.Current.Request.QueryString[strName], defValue);
        }

        /// <summary>
        /// 获得指定表单参数的decimal类型值
        /// </summary>
        /// <param name="strName">表单参数</param>
        /// <param name="defValue">缺省值</param>
        /// <returns>表单参数的decimal类型值</returns>
        public static decimal GetFormDecimal(string strName, decimal defValue)
        {
            return Utils.StrToDecimal(HttpContext.Current.Request.Form[strName], defValue);
        }

		/// <summary>
		/// 获得指定Url参数的float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 float GetQueryFloat(string strName, float defValue)
		{
			return Utils.StrToFloat(HttpContext.Current.Request.QueryString[strName], defValue);
		}

		/// <summary>
		/// 获得指定表单参数的float类型值
		/// </summary>
		/// <param name="strName">表单参数</param>
		/// <param name="defValue">缺省值</param>
		/// <returns>表单参数的float类型值</returns>
		public static float GetFormFloat(string strName, float defValue)
		{
			return Utils.StrToFloat(HttpContext.Current.Request.Form[strName], defValue);
		}
		
		/// <summary>
		/// 获得指定Url或表单参数的float类型值, 先判断Url参数是否为缺省值, 如为True则返回表单参数的值
		/// </summary>
		/// <param name="strName">Url或表单参数</param>
		/// <param name="defValue">缺省值</param>
		/// <returns>Url或表单参数的int类型值</returns>
		public static float GetFloat(string strName, float defValue)
		{
			if (GetQueryFloat(strName, defValue) == defValue)
				return GetFormFloat(strName, defValue);
			else
				return GetQueryFloat(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;
		}

	}
}