using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

namespace HySoft.Common
{
    public class CommonRequest
    {
        /// <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;
        }
        /// <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];
        }

        /// <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>
        /// 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>
        /// <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>
        /// <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"];
            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;
        }
    }
}
