using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Trade.Client.Helpers
{

	/// <summary>
	/// Http连接操作帮助类
	/// </summary>
	public class HttpHelper
	{
		public static HttpResult Get(string Url)
		{
			return new HttpHelper().GetHtml(new HttpItem
			{
				URL = Url,
				Method = MethodType.Get,
			});
		}

		public static HttpResult Post(string Url, string PostData)
		{
			return new HttpHelper().GetHtml(new HttpItem
			{
				URL = Url,
				Method = MethodType.Get,
				Postdata = PostData,
				PostDataType = PostDataType.String
			});
		}
		public static HttpResult Request(HttpItem item)
		{
			return new HttpHelper().GetHtml(item);
		}

		#region 异步方法

		/// <summary>
		/// 异步Get请求
		/// </summary>
		public static Task<HttpResult> GetAsync(string Url)
		{
			return new HttpHelper().GetHtmlAsync(new HttpItem
			{
				URL = Url,
				Method = MethodType.Get,
			});
		}

		/// <summary>
		/// 异步Post请求
		/// </summary>
		public static Task<HttpResult> PostAsync(string Url, string PostData)
		{
			return new HttpHelper().GetHtmlAsync(new HttpItem
			{
				URL = Url,
				Method = MethodType.Post,
				Postdata = PostData,
				PostDataType = PostDataType.String
			});
		}

		/// <summary>
		/// 异步执行请求
		/// </summary>
		public static Task<HttpResult> RequestAsync(HttpItem item)
		{
			return new HttpHelper().GetHtmlAsync(item);
		}

		/// <summary>
		/// 异步下载文件
		/// </summary>
		/// <param name="address"></param>
		public static async Task<byte[]> DownloadFileAsync(string address)
		{
			HttpItem item = new HttpItem();
			item.URL = address;
			item.Timeout = 3000;
			item.ResultType = ResultType.Byte;
			HttpHelper http = new HttpHelper();
			HttpResult result = await http.GetHtmlAsync(item);
			if (result.StatusCode == HttpStatusCode.OK)
			{
				return result.ResultByte;
			}
			else
			{
				throw new HttpListenerException((int)result.StatusCode, result.StatusDescription);
			}
		}

		/// <summary>
		/// 异步下载文件并保存到本地
		/// </summary>
		/// <param name="address"></param>
		/// <param name="fileName"></param>
		public static async Task<bool> DownloadFileAsync(string address, string fileName)
		{
			HttpItem item = new HttpItem();
			item.URL = address;
			item.Timeout = 3000;
			item.ResultType = ResultType.Byte;
			HttpHelper http = new HttpHelper();
			HttpResult result = await http.GetHtmlAsync(item);
			if (result.StatusCode == HttpStatusCode.OK)
			{
				using (FileStream fs = new FileStream(fileName, FileMode.CreateNew))
				{
					await fs.WriteAsync(result.ResultByte, 0, result.ResultByte.Length);
				}
			}
			else
			{
				throw new HttpListenerException((int)result.StatusCode, result.StatusDescription);
			}

			return true;
		}

		#endregion

		/// <summary>
		/// 下载文件
		/// </summary>
		/// <param name="address"></param>
		/// <param name="fileName"></param>
		public static byte[] DownloadFile(string address)
		{
			HttpItem item = new HttpItem();
			item.URL = address;
			item.Timeout = 3000;
			item.ResultType = ResultType.Byte;
			HttpHelper http = new HttpHelper();
			HttpResult result = http.GetHtml(item);
			if (result.StatusCode == HttpStatusCode.OK)
			{
				return result.ResultByte;
			}
			else
			{
				throw new HttpListenerException((int)result.StatusCode, result.StatusDescription);
			}
		}

		/// <summary>
		/// 下载文件
		/// </summary>
		/// <param name="address"></param>
		/// <param name="fileName"></param>
		public static bool DownloadFile(string address, string fileName)
		{
			HttpItem item = new HttpItem();
			item.URL = address;
			item.Timeout = 3000;
			item.ResultType = ResultType.Byte;
			HttpHelper http = new HttpHelper();
			HttpResult result = http.GetHtml(item);
			if (result.StatusCode == HttpStatusCode.OK)
			{
				FileStream fs = new FileStream(fileName, FileMode.CreateNew);
				BinaryWriter bw = new BinaryWriter(fs);
				bw.Write(result.ResultByte);
				fs.Close();
				bw.Close();
			}
			else
			{
				throw new HttpListenerException((int)result.StatusCode, result.StatusDescription);
			}

			return true;
		}

		#region 预定义方法或者变更
		//默认的编码
		private Encoding encoding = Encoding.Default;
		//Post数据编码
		private Encoding postencoding = Encoding.Default;
		//HttpWebRequest对象用来发起请求
		private HttpWebRequest request = null;
		//获取影响流的数据对象
		private HttpWebResponse response = null;
		/// <summary>
		/// 根据相传入的数据，得到相应页面数据
		/// </summary>
		/// <param name="item">参数类对象</param>
		/// <returns>返回HttpResult类型</returns>
		public HttpResult GetHtml(HttpItem item)
		{
			//返回参数
			HttpResult result = new HttpResult();
			result.item = item;
			try
			{
				//准备参数
				SetRequest(item);
			}
			catch (Exception ex)
			{
				result = new HttpResult();
				result.Cookie = string.Empty;
				result.Header = null;
				result.Html = ex.Message;
				result.StatusDescription = "配置参数时出错：" + ex.Message;
				return result;
			}
			try
			{
				#region 得到请求的response
				using (response = (HttpWebResponse)request.GetResponse())
				{
					result.StatusCode = response.StatusCode;
					result.StatusDescription = response.StatusDescription;
					result.Header = response.Headers;
					if (response.Cookies != null) result.CookieCollection = response.Cookies;
					if (response.Headers["set-cookie"] != null) result.Cookie = response.Headers["set-cookie"];
					MemoryStream _stream = new MemoryStream();
					//GZIIP处理
					if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
					{
						//开始读取流并设置编码方式
						//new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240);
						//.net4.0以下写法
						_stream = GetMemoryStream(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress));

					}
					else
					{
						//开始读取流并设置编码方式
						//response.GetResponseStream().CopyTo(_stream, 10240);
						//.net4.0以下写法
						_stream = GetMemoryStream(response.GetResponseStream());
					}
					//获取Byte
					byte[] ResponseByte = _stream.ToArray();
					_stream.Close();
					if (ResponseByte != null & ResponseByte.Length > 0)
					{
						//是否返回Byte类型数据
						if (item.ResultType == ResultType.Byte) result.ResultByte = ResponseByte;
						//从这里开始我们要无视编码了
						if (encoding == null)
						{
							Match meta = Regex.Match(Encoding.Default.GetString(ResponseByte), "<meta([^<]*)charset=([^<]*)[\"']", RegexOptions.IgnoreCase);
							string c = (meta.Groups.Count > 1) ? meta.Groups[2].Value.ToLower().Trim() : string.Empty;
							if (c.Length > 2)
							{
								try
								{
									if (c.IndexOf(" ") > 0) c = c.Substring(0, c.IndexOf(" "));
									encoding = Encoding.GetEncoding(c.Replace("\"", "").Replace("'", "").Replace(";", "").Replace("iso-8859-1", "gbk").Trim());
								}
								catch
								{
									if (string.IsNullOrEmpty(response.CharacterSet)) encoding = Encoding.UTF8;
									else encoding = Encoding.GetEncoding(response.CharacterSet);
								}
							}
							else
							{
								if (string.IsNullOrEmpty(response.CharacterSet)) encoding = Encoding.UTF8;
								else encoding = Encoding.GetEncoding(response.CharacterSet);
							}
						}
						//得到返回的HTML
						result.Html = encoding.GetString(ResponseByte);
					}
					else
					{
						//得到返回的HTML
						result.Html = "本次请求并未返回任何数据";
					}
				}
				#endregion
			}
			catch (WebException ex)
			{
				//这里是在发生异常时返回的错误信息
				response = (HttpWebResponse)ex.Response;
				result.Html = ex.Message;
				if (response != null)
				{
					result.StatusCode = response.StatusCode;
					result.StatusDescription = response.StatusDescription;
				}
			}
			catch (Exception ex)
			{
				result.Html = ex.Message;
			}
			if (item.IsToLower) result.Html = result.Html.ToLower();
			return result;
		}

		/// <summary>
		/// 根据相传入的数据，异步得到相应页面数据
		/// </summary>
		/// <param name="item">参数类对象</param>
		/// <returns>返回HttpResult类型</returns>
		public async Task<HttpResult> GetHtmlAsync(HttpItem item)
		{
			//返回参数
			HttpResult result = new HttpResult();
			result.item = item;
			try
			{
				//准备参数（不在此处同步写入Post数据，改为异步写入）
				SetRequest(item, false);
				await SetPostDataAsync(item);
			}
			catch (Exception ex)
			{
				result = new HttpResult();
				result.Cookie = string.Empty;
				result.Header = null;
				result.Html = ex.Message;
				result.StatusDescription = "配置参数时出错：" + ex.Message;
				return result;
			}
			try
			{
				#region 得到请求的response
				using (response = (HttpWebResponse)await request.GetResponseAsync())
				{
					result.StatusCode = response.StatusCode;
					result.StatusDescription = response.StatusDescription;
					result.Header = response.Headers;
					if (response.Cookies != null) result.CookieCollection = response.Cookies;
					if (response.Headers["set-cookie"] != null) result.Cookie = response.Headers["set-cookie"];
					MemoryStream _stream;
					//GZIIP处理
					if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
					{
						_stream = await GetMemoryStreamAsync(new GZipStream(response.GetResponseStream(), CompressionMode.Decompress));
					}
					else
					{
						_stream = await GetMemoryStreamAsync(response.GetResponseStream());
					}
					//获取Byte
					byte[] ResponseByte = _stream.ToArray();
					_stream.Close();
					if (ResponseByte != null & ResponseByte.Length > 0)
					{
						//是否返回Byte类型数据
						if (item.ResultType == ResultType.Byte) result.ResultByte = ResponseByte;
						//从这里开始我们要无视编码了
						if (encoding == null)
						{
							Match meta = Regex.Match(Encoding.Default.GetString(ResponseByte), "<meta([^<]*)charset=([^<]*)[\"']", RegexOptions.IgnoreCase);
							string c = (meta.Groups.Count > 1) ? meta.Groups[2].Value.ToLower().Trim() : string.Empty;
							if (c.Length > 2)
							{
								try
								{
									if (c.IndexOf(" ") > 0) c = c.Substring(0, c.IndexOf(" "));
									encoding = Encoding.GetEncoding(c.Replace("\"", "").Replace("'", "").Replace(";", "").Replace("iso-8859-1", "gbk").Trim());
								}
								catch
								{
									if (string.IsNullOrEmpty(response.CharacterSet)) encoding = Encoding.UTF8;
									else encoding = Encoding.GetEncoding(response.CharacterSet);
								}
							}
							else
							{
								if (string.IsNullOrEmpty(response.CharacterSet)) encoding = Encoding.UTF8;
								else encoding = Encoding.GetEncoding(response.CharacterSet);
							}
						}
						//得到返回的HTML
						result.Html = encoding.GetString(ResponseByte);
					}
					else
					{
						//得到返回的HTML
						result.Html = "本次请求并未返回任何数据";
					}
				}
				#endregion
			}
			catch (WebException ex)
			{
				//这里是在发生异常时返回的错误信息
				response = (HttpWebResponse)ex.Response;
				result.Html = ex.Message;
				if (response != null)
				{
					result.StatusCode = response.StatusCode;
					result.StatusDescription = response.StatusDescription;
				}
			}
			catch (Exception ex)
			{
				result.Html = ex.Message;
			}
			if (item.IsToLower) result.Html = result.Html.ToLower();
			return result;
		}

		/// <summary>
		/// 4.0以下.net版本取数据使用
		/// </summary>
		/// <param name="streamResponse">流</param>
		private MemoryStream GetMemoryStream(Stream streamResponse)
		{
			MemoryStream _stream = new MemoryStream();
			int Length = 256;
			Byte[] buffer = new Byte[Length];
			int bytesRead = streamResponse.Read(buffer, 0, Length);
			while (bytesRead > 0)
			{
				_stream.Write(buffer, 0, bytesRead);
				bytesRead = streamResponse.Read(buffer, 0, Length);
			}
			return _stream;
		}

		/// <summary>
		/// 异步读取流数据
		/// </summary>
		/// <param name="streamResponse">流</param>
		private async Task<MemoryStream> GetMemoryStreamAsync(Stream streamResponse)
		{
			MemoryStream _stream = new MemoryStream();
			await streamResponse.CopyToAsync(_stream);
			return _stream;
		}
		/// <summary>
		/// 为请求准备参数
		/// </summary>
		///<param name="item">参数列表</param>
		private void SetRequest(HttpItem item)
		{
			SetRequest(item, true);
		}

		/// <summary>
		/// 为请求准备参数
		/// </summary>
		/// <param name="item">参数列表</param>
		/// <param name="setPostDataSync">是否在此处同步写入Post数据。异步调用时传入false，改由调用方await SetPostDataAsync写入</param>
		private void SetRequest(HttpItem item, bool setPostDataSync)
		{
			// 验证证书
			SetCer(item);
			//设置Header参数
			if (item.Header != null && item.Header.Count > 0) foreach (string key in item.Header.AllKeys)
			{
				request.Headers.Add(key, item.Header[key]);
			}
			// 设置代理
			SetProxy(item);
			if (item.ProtocolVersion != null) request.ProtocolVersion = item.ProtocolVersion;
			request.ServicePoint.Expect100Continue = item.Expect100Continue;
			//请求方式Get或者Post
			request.Method = item.Method.ToString();
			request.Timeout = item.Timeout;
			request.KeepAlive = item.KeepAlive;
			request.ReadWriteTimeout = item.ReadWriteTimeout;
			//Accept
			request.Accept = item.Accept;
			//ContentType返回类型
			request.ContentType = item.ContentType;
			//UserAgent客户端的访问类型，包括浏览器版本和操作系统信息
			request.UserAgent = item.UserAgent;
			// 编码
			encoding = item.Encoding;
			//设置安全凭证
			request.Credentials = item.ICredentials;
			//设置Cookie
			SetCookie(item);
			//来源地址
			request.Referer = item.Referer;
			//是否执行跳转功能
			request.AllowAutoRedirect = item.Allowautoredirect;
			//设置JWT Bearer Token（Authorization: Bearer xxx）
			SetJwt(item);
			//设置Post数据
			if (setPostDataSync) SetPostData(item);
			//设置最大连接
			if (item.Connectionlimit > 0) request.ServicePoint.ConnectionLimit = item.Connectionlimit;
		}

		/// <summary>
		/// 设置JWT令牌到请求头（Authorization: Bearer {JwtToken}）
		/// 如果同时设置了AuthorizationHeaderScheme，则使用自定义的方案名代替Bearer
		/// </summary>
		/// <param name="item">Http参数</param>
		private void SetJwt(HttpItem item)
		{
			if (!string.IsNullOrEmpty(item.JwtToken))
			{
				string scheme = string.IsNullOrEmpty(item.AuthorizationScheme) ? "Bearer" : item.AuthorizationScheme;
				request.Headers[HttpRequestHeader.Authorization] = $"{scheme} {item.JwtToken}";
			}
		}
		/// <summary>
		/// 设置证书
		/// </summary>
		/// <param name="item"></param>
		private void SetCer(HttpItem item)
		{
			if (!string.IsNullOrEmpty(item.CerPath))
			{
				//这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。
				ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
				//初始化对像，并设置请求的URL地址
				request = (HttpWebRequest)WebRequest.Create(item.URL);
				SetCerList(item);
				//将证书添加到请求里
				request.ClientCertificates.Add(new X509Certificate(item.CerPath));
			}
			else
			{
				//初始化对像，并设置请求的URL地址
				request = (HttpWebRequest)WebRequest.Create(item.URL);
				SetCerList(item);
			}
		}
		/// <summary>
		/// 设置多个证书
		/// </summary>
		/// <param name="item"></param>
		private void SetCerList(HttpItem item)
		{
			if (item.ClentCertificates != null && item.ClentCertificates.Count > 0)
			{
				foreach (X509Certificate c in item.ClentCertificates)
				{
					request.ClientCertificates.Add(c);
				}
			}
		}
		/// <summary>
		/// 设置Cookie
		/// </summary>
		/// <param name="item">Http参数</param>
		private void SetCookie(HttpItem item)
		{
			if (!string.IsNullOrEmpty(item.Cookie)) request.Headers[HttpRequestHeader.Cookie] = item.Cookie;
			//设置CookieCollection
			if (item.ResultCookieType == ResultCookieType.CookieCollection)
			{
				request.CookieContainer = new CookieContainer();
				if (item.CookieCollection != null && item.CookieCollection.Count > 0)
					request.CookieContainer.Add(item.CookieCollection);
			}
		}
		/// <summary>
		/// 设置Post数据
		/// </summary>
		/// <param name="item">Http参数</param>
		private void SetPostData(HttpItem item)
		{
			//验证在得到结果时是否有传入数据
			if (request.Method.Trim().ToLower().Contains("post"))
			{
				byte[] buffer = GetPostBuffer(item);
				if (buffer != null)
				{
					request.ContentLength = buffer.Length;
					request.GetRequestStream().Write(buffer, 0, buffer.Length);
				}
			}
		}

		/// <summary>
		/// 异步设置Post数据
		/// </summary>
		/// <param name="item">Http参数</param>
		private async Task SetPostDataAsync(HttpItem item)
		{
			//验证在得到结果时是否有传入数据
			if (request.Method.Trim().ToLower().Contains("post"))
			{
				byte[] buffer = GetPostBuffer(item);
				if (buffer != null)
				{
					request.ContentLength = buffer.Length;
					using (Stream stream = await request.GetRequestStreamAsync())
					{
						await stream.WriteAsync(buffer, 0, buffer.Length);
					}
				}
			}
		}

		/// <summary>
		/// 根据HttpItem的PostDataType构建要发送的Post数据字节数组
		/// </summary>
		/// <param name="item">Http参数</param>
		private byte[] GetPostBuffer(HttpItem item)
		{
			if (item.PostEncoding != null)
			{
				postencoding = item.PostEncoding;
			}
			byte[] buffer = null;
			//写入Byte类型
			if (item.PostDataType == PostDataType.Byte && item.PostdataByte != null && item.PostdataByte.Length > 0)
			{
				//验证在得到结果时是否有传入数据
				buffer = item.PostdataByte;
			}//写入文件
			else if (item.PostDataType == PostDataType.FilePath && !string.IsNullOrEmpty(item.Postdata))
			{
				using (StreamReader r = new StreamReader(item.Postdata, postencoding))
				{
					buffer = postencoding.GetBytes(r.ReadToEnd());
				}
			} //写入字符串
			else if (!string.IsNullOrEmpty(item.Postdata))
			{
				buffer = postencoding.GetBytes(item.Postdata);
			}
			return buffer;
		}
		/// <summary>
		/// 设置代理
		/// </summary>
		/// <param name="item">参数对象</param>
		private void SetProxy(HttpItem item)
		{
			bool isIeProxy = item.ProxyIp.ToLower().Contains("ieproxy");
			if (!string.IsNullOrEmpty(item.ProxyIp) && !isIeProxy)
			{
				//设置代理服务器
				if (item.ProxyIp.Contains(":"))
				{
					string[] plist = item.ProxyIp.Split(':');
					WebProxy myProxy = new WebProxy(plist[0].Trim(), Convert.ToInt32(plist[1].Trim()));
					//建议连接
					myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
					//给当前请求对象
					request.Proxy = myProxy;
				}
				else
				{
					WebProxy myProxy = new WebProxy(item.ProxyIp, false);
					//建议连接
					myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
					//给当前请求对象
					request.Proxy = myProxy;
				}
			}
			else if (isIeProxy)
			{
				//设置为IE代理
			}
			else
			{
				request.Proxy = item.WebProxy;
			}
		}
		/// <summary>
		/// 回调验证证书问题
		/// </summary>
		/// <param name="sender">流对象</param>
		/// <param name="certificate">证书</param>
		/// <param name="chain">X509Chain</param>
		/// <param name="errors">SslPolicyErrors</param>
		/// <returns>bool</returns>
		public bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; }
		#endregion
	}
	/// <summary>
	/// Http请求参考类
	/// </summary>
	public class HttpItem
	{
		string _URL = string.Empty;
		/// <summary>
		/// 请求URL必须填写
		/// </summary>
		public string URL
		{
			get { return _URL; }
			set { _URL = value; }
		}
		MethodType _Method = MethodType.Get;
		/// <summary>
		/// 请求方式默认为GET方式,当为POST方式时必须设置Postdata的值
		public MethodType Method
		/// </summary>
		{
			get { return _Method; }
			set
			{
				_Method = value;
				if (_Method == MethodType.Post)
				{
					_ContentType = "application/x-www-form-urlencoded";
				}
			}
		}
		int _Timeout = 100000;
		/// <summary>
		/// 默认请求超时时间
		/// </summary>
		public int Timeout
		{
			get { return _Timeout; }
			set { _Timeout = value; }
		}
		int _ReadWriteTimeout = 30000;
		/// <summary>
		/// 默认写入Post数据超时间
		/// </summary>
		public int ReadWriteTimeout
		{
			get { return _ReadWriteTimeout; }
			set { _ReadWriteTimeout = value; }
		}
		Boolean _KeepAlive = true;
		/// <summary>
		///  获取或设置一个值，该值指示是否与 Internet 资源建立持久性连接默认为true。
		/// </summary>
		public Boolean KeepAlive
		{
			get { return _KeepAlive; }
			set { _KeepAlive = value; }
		}
		string _Accept = "text/html, application/xhtml+xml, */*";
		/// <summary>
		/// 请求标头值 默认为text/html, application/xhtml+xml, */*
		/// </summary>
		public string Accept
		{
			get { return _Accept; }
			set { _Accept = value; }
		}
		string _ContentType = "text/html";
		/// <summary>
		/// 请求返回类型默认 text/html
		/// </summary>
		public string ContentType
		{
			get { return _ContentType; }
			set { _ContentType = value; }
		}
		string _UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)";
		/// <summary>
		/// 客户端访问信息默认Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
		/// </summary>
		public string UserAgent
		{
			get { return _UserAgent; }
			set { _UserAgent = value; }
		}
		Encoding _Encoding = null;
		/// <summary>
		/// 返回数据编码默认为NUll,可以自动识别,一般为utf-8,gbk,gb2312
		/// </summary>
		public Encoding Encoding
		{
			get { return _Encoding; }
			set { _Encoding = value; }
		}
		private PostDataType _PostDataType = PostDataType.String;
		/// <summary>
		/// Post的数据类型
		/// </summary>
		public PostDataType PostDataType
		{
			get { return _PostDataType; }
			set { _PostDataType = value; }
		}
		string _Postdata = string.Empty;
		/// <summary>
		/// Post请求时要发送的字符串Post数据
		/// </summary>
		public string Postdata
		{
			get { return _Postdata; }
			set { _Postdata = value; }
		}
		private byte[] _PostdataByte = null;
		/// <summary>
		/// Post请求时要发送的Byte类型的Post数据
		/// </summary>
		public byte[] PostdataByte
		{
			get { return _PostdataByte; }
			set { _PostdataByte = value; }
		}
		private WebProxy _WebProxy;
		/// <summary>
		/// 设置代理对象，不想使用IE默认配置就设置为Null，而且不要设置ProxyIp
		/// </summary>
		public WebProxy WebProxy
		{
			get { return _WebProxy; }
			set { _WebProxy = value; }
		}

		CookieCollection cookiecollection = null;
		/// <summary>
		/// Cookie对象集合
		/// </summary>
		public CookieCollection CookieCollection
		{
			get { return cookiecollection; }
			set { cookiecollection = value; }
		}
		string _Cookie = string.Empty;
		/// <summary>
		/// 请求时的Cookie
		/// </summary>
		public string Cookie
		{
			get { return _Cookie; }
			set { _Cookie = value; }
		}
		string _Referer = string.Empty;
		/// <summary>
		/// 来源地址，上次访问地址
		/// </summary>
		public string Referer
		{
			get { return _Referer; }
			set { _Referer = value; }
		}
		string _CerPath = string.Empty;
		/// <summary>
		/// 证书绝对路径
		/// </summary>
		public string CerPath
		{
			get { return _CerPath; }
			set { _CerPath = value; }
		}
		private Boolean isToLower = false;
		/// <summary>
		/// 是否设置为全文小写，默认为不转化
		/// </summary>
		public Boolean IsToLower
		{
			get { return isToLower; }
			set { isToLower = value; }
		}
		private string _JwtToken = string.Empty;
		/// <summary>
		/// JWT令牌（不含Bearer前缀），设置后会自动添加到请求头 Authorization: Bearer {JwtToken}
		/// </summary>
		public string JwtToken
		{
			get { return _JwtToken; }
			set { _JwtToken = value; }
		}
		private string _AuthorizationScheme = "Bearer";
		/// <summary>
		/// Authorization请求头的方案名，默认为Bearer，一般无需修改
		/// </summary>
		public string AuthorizationScheme
		{
			get { return _AuthorizationScheme; }
			set { _AuthorizationScheme = value; }
		}
		private Boolean allowautoredirect = true;
		/// <summary>
		/// 支持跳转页面，查询结果将是跳转后的页面
		/// </summary>
		public Boolean Allowautoredirect
		{
			get { return allowautoredirect; }
			set { allowautoredirect = value; }
		}
		private int connectionlimit = 1024;
		/// <summary>
		/// 最大连接数
		/// </summary>
		public int Connectionlimit
		{
			get { return connectionlimit; }
			set { connectionlimit = value; }
		}
		private string proxyusername = string.Empty;
		/// <summary>
		/// 代理Proxy 服务器用户名
		/// </summary>
		public string ProxyUserName
		{
			get { return proxyusername; }
			set { proxyusername = value; }
		}
		private string proxypwd = string.Empty;
		/// <summary>
		/// 代理 服务器密码
		/// </summary>
		public string ProxyPwd
		{
			get { return proxypwd; }
			set { proxypwd = value; }
		}
		private string proxyip = string.Empty;
		/// <summary>
		/// 代理 服务IP ,如果要使用IE代理就设置为ieproxy
		/// </summary>
		public string ProxyIp
		{
			get { return proxyip; }
			set { proxyip = value; }
		}
		private ResultType resulttype = ResultType.String;
		/// <summary>
		/// 设置返回类型String和Byte
		/// </summary>
		public ResultType ResultType
		{
			get { return resulttype; }
			set { resulttype = value; }
		}
		private WebHeaderCollection header = new WebHeaderCollection();
		/// <summary>
		/// header对象
		/// </summary>
		public WebHeaderCollection Header
		{
			get { return header; }
			set { header = value; }
		}

		private Version _ProtocolVersion;

		/// <summary>
		//     获取或设置用于请求的 HTTP 版本。返回结果:用于请求的 HTTP 版本。默认为 System.Net.HttpVersion.Version11。
		/// </summary>
		public Version ProtocolVersion
		{
			get { return _ProtocolVersion; }
			set { _ProtocolVersion = value; }
		}
		private Boolean _expect100continue = true;
		/// <summary>
		///  获取或设置一个 System.Boolean 值，该值确定是否使用 100-Continue 行为。如果 POST 请求需要 100-Continue 响应，则为 true；否则为 false。默认值为 true。
		/// </summary>
		public Boolean Expect100Continue
		{
			get { return _expect100continue; }
			set { _expect100continue = value; }
		}
		private X509CertificateCollection _ClentCertificates;
		/// <summary>
		/// 设置509证书集合
		/// </summary>
		public X509CertificateCollection ClentCertificates
		{
			get { return _ClentCertificates; }
			set { _ClentCertificates = value; }
		}
		private Encoding _PostEncoding;
		/// <summary>
		/// 设置或获取Post参数编码,默认的为Default编码
		/// </summary>
		public Encoding PostEncoding
		{
			get { return _PostEncoding; }
			set { _PostEncoding = value; }
		}
		private ResultCookieType _ResultCookieType = ResultCookieType.String;
		/// <summary>
		/// Cookie返回类型,默认的是只返回字符串类型
		/// </summary>
		public ResultCookieType ResultCookieType
		{
			get { return _ResultCookieType; }
			set { _ResultCookieType = value; }
		}

		private ICredentials _ICredentials = CredentialCache.DefaultCredentials;
		/// <summary>
		/// 获取或设置请求的身份验证信息。
		/// </summary>
		public ICredentials ICredentials
		{
			get { return _ICredentials; }
			set { _ICredentials = value; }
		}

	}
	/// <summary>
	/// Http返回参数类
	/// </summary>
	public class HttpResult
	{
		private string _Cookie;
		/// <summary>
		/// Http请求返回的Cookie
		/// </summary>
		public string Cookie
		{
			get { return _Cookie; }
			set { _Cookie = value; }
		}

		private CookieCollection _CookieCollection;
		/// <summary>
		/// Cookie对象集合
		/// </summary>
		public CookieCollection CookieCollection
		{
			get { return _CookieCollection; }
			set { _CookieCollection = value; }
		}
		private string _Html;
		/// <summary>
		/// 返回的String类型数据 只有ResultType.String时才返回数据，其它情况为空
		/// </summary>
		public string Html
		{
			get { return _Html; }
			set { _Html = value; }
		}
		private byte[] _ResultByte;
		/// <summary>
		/// 返回的Byte数组 只有ResultType.Byte时才返回数据，其它情况为空
		/// </summary>
		public byte[] ResultByte
		{
			get { return _ResultByte; }
			set { _ResultByte = value; }
		}

		private WebHeaderCollection _Header;
		/// <summary>
		/// header对象
		/// </summary>
		public WebHeaderCollection Header
		{
			get { return _Header; }
			set { _Header = value; }
		}

		private string _StatusDescription;
		/// <summary>
		/// 返回状态说明
		/// </summary>
		public string StatusDescription
		{
			get { return _StatusDescription; }
			set { _StatusDescription = value; }
		}
		private HttpStatusCode _StatusCode;
		/// <summary>
		/// 返回状态码,默认为OK
		/// </summary>
		public HttpStatusCode StatusCode
		{
			get { return _StatusCode; }
			set { _StatusCode = value; }
		}
		/// <summary>
		/// HttpItem类，用于存储实际执行所用到的HttpItem对象
		/// </summary>
		public HttpItem item { get; set; }
	}
	/// <summary>
	/// 返回类型
	/// </summary>
	public enum ResultType
	{
		/// <summary>
		/// 表示只返回字符串 只有Html有数据
		/// </summary>
		String,
		/// <summary>
		/// 表示返回字符串和字节流 ResultByte和Html都有数据返回
		/// </summary>
		Byte
	}
	/// <summary>
	/// Post的数据格式默认为string
	/// </summary>
	public enum PostDataType
	{
		/// <summary>
		/// 字符串类型，这时编码Encoding可不设置
		/// </summary>
		String,
		/// <summary>
		/// Byte类型，需要设置PostdataByte参数的值编码Encoding可设置为空
		/// </summary>
		Byte,
		/// <summary>
		/// 传文件，Postdata必须设置为文件的绝对路径，必须设置Encoding的值
		/// </summary>
		FilePath
	}
	/// <summary>
	/// Cookie返回类型
	/// </summary>
	public enum ResultCookieType
	{
		/// <summary>
		/// 只返回字符串类型的Cookie
		/// </summary>
		String,
		/// <summary>
		/// CookieCollection格式的Cookie集合同时也返回String类型的cookie
		/// </summary>
		CookieCollection
	}
	public enum MethodType
	{
		Get,
		Post
	}

	/// <summary>
	/// 轻量级JWT帮助类：不依赖第三方NuGet包，支持HS256签名的生成与验证。
	/// 生成的Token可直接赋值给 HttpItem.JwtToken，HttpHelper会自动添加到Authorization请求头。
	/// </summary>
	public static class JwtHelper
	{
		/// <summary>
		/// 生成JWT（HS256签名）
		/// </summary>
		/// <param name="claims">自定义payload声明，例如 { "sub", "1001" }, { "name", "cow" }</param>
		/// <param name="secret">签名密钥</param>
		/// <param name="expireMinutes">过期时间(分钟)，默认60分钟</param>
		/// <returns>完整的JWT字符串：header.payload.signature</returns>
		public static string GenerateToken(Dictionary<string, object> claims, string secret, int expireMinutes = 60)
		{
			if (claims == null) claims = new Dictionary<string, object>();
			if (string.IsNullOrEmpty(secret)) throw new ArgumentException("secret不能为空", nameof(secret));

			var header = new Dictionary<string, object>
			{
				{ "alg", "HS256" },
				{ "typ", "JWT" }
			};

			var payload = new Dictionary<string, object>(claims);
			long now = ToUnixTimeSeconds(DateTime.UtcNow);
			if (!payload.ContainsKey("iat")) payload["iat"] = now;
			if (!payload.ContainsKey("exp")) payload["exp"] = now + (expireMinutes * 60L);

			string headerEncoded = Base64UrlEncode(Encoding.UTF8.GetBytes(ToJson(header)));
			string payloadEncoded = Base64UrlEncode(Encoding.UTF8.GetBytes(ToJson(payload)));
			string signingInput = headerEncoded + "." + payloadEncoded;
			string signature = Sign(signingInput, secret);

			return signingInput + "." + signature;
		}

		/// <summary>
		/// 校验JWT签名和有效期，成功时返回payload中的声明
		/// </summary>
		/// <param name="token">JWT字符串</param>
		/// <param name="secret">签名密钥</param>
		/// <param name="claims">解析出的payload声明</param>
		/// <param name="error">失败时的错误信息</param>
		/// <returns>是否验证通过</returns>
		public static bool ValidateToken(string token, string secret, out Dictionary<string, object> claims, out string error)
		{
			claims = null;
			error = null;
			if (string.IsNullOrEmpty(token))
			{
				error = "token不能为空";
				return false;
			}
			string[] parts = token.Split('.');
			if (parts.Length != 3)
			{
				error = "token格式不正确";
				return false;
			}
			string signingInput = parts[0] + "." + parts[1];
			string expectedSignature = Sign(signingInput, secret);
			if (!SlowEquals(expectedSignature, parts[2]))
			{
				error = "签名校验失败";
				return false;
			}
			string payloadJson;
			try
			{
				payloadJson = Encoding.UTF8.GetString(Base64UrlDecode(parts[1]));
				claims = FromJson(payloadJson);
			}
			catch (Exception ex)
			{
				error = "payload解析失败：" + ex.Message;
				return false;
			}
			if (claims.TryGetValue("exp", out object expObj))
			{
				if (long.TryParse(expObj.ToString(), out long exp))
				{
					if (ToUnixTimeSeconds(DateTime.UtcNow) > exp)
					{
						error = "token已过期";
						return false;
					}
				}
			}
			return true;
		}

		/// <summary>
		/// 不校验签名，仅解析出JWT的payload内容（用于调试查看Token内容）
		/// </summary>
		public static Dictionary<string, object> DecodeToken(string token)
		{
			if (string.IsNullOrEmpty(token)) throw new ArgumentException("token不能为空", nameof(token));
			string[] parts = token.Split('.');
			if (parts.Length != 3) throw new FormatException("token格式不正确");
			string payloadJson = Encoding.UTF8.GetString(Base64UrlDecode(parts[1]));
			return FromJson(payloadJson);
		}

		private static string Sign(string input, string secret)
		{
			using (var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(secret ?? string.Empty)))
			{
				byte[] hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(input));
				return Base64UrlEncode(hash);
			}
		}

		private static bool SlowEquals(string a, string b)
		{
			if (a == null || b == null) return false;
			if (a.Length != b.Length) return false;
			int diff = 0;
			for (int i = 0; i < a.Length; i++)
			{
				diff |= a[i] ^ b[i];
			}
			return diff == 0;
		}

		private static long ToUnixTimeSeconds(DateTime utcDateTime)
		{
			return (long)(utcDateTime - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;
		}

		private static string Base64UrlEncode(byte[] input)
		{
			return Convert.ToBase64String(input).TrimEnd('=').Replace('+', '-').Replace('/', '_');
		}

		private static byte[] Base64UrlDecode(string input)
		{
			string s = input.Replace('-', '+').Replace('_', '/');
			switch (s.Length % 4)
			{
				case 2: s += "=="; break;
				case 3: s += "="; break;
			}
			return Convert.FromBase64String(s);
		}

		/// <summary>
		/// 极简JSON序列化，支持扁平的 Dictionary&lt;string, object&gt;，值类型支持 string/数值/bool/null
		/// </summary>
		private static string ToJson(Dictionary<string, object> dict)
		{
			var sb = new StringBuilder();
			sb.Append('{');
			bool first = true;
			foreach (var kv in dict)
			{
				if (!first) sb.Append(',');
				first = false;
				sb.Append('"').Append(EscapeJson(kv.Key)).Append("\":");
				AppendJsonValue(sb, kv.Value);
			}
			sb.Append('}');
			return sb.ToString();
		}

		private static void AppendJsonValue(StringBuilder sb, object value)
		{
			if (value == null)
			{
				sb.Append("null");
			}
			else if (value is bool b)
			{
				sb.Append(b ? "true" : "false");
			}
			else if (value is sbyte || value is byte || value is short || value is ushort ||
					 value is int || value is uint || value is long || value is ulong ||
					 value is float || value is double || value is decimal)
			{
				sb.Append(Convert.ToString(value, System.Globalization.CultureInfo.InvariantCulture));
			}
			else
			{
				sb.Append('"').Append(EscapeJson(value.ToString())).Append('"');
			}
		}

		private static string EscapeJson(string s)
		{
			return s.Replace("\\", "\\\\").Replace("\"", "\\\"").Replace("\n", "\\n").Replace("\r", "\\r").Replace("\t", "\\t");
		}

		/// <summary>
		/// 极简JSON反序列化，仅支持扁平对象（JWT payload通常满足此结构）
		/// </summary>
		private static Dictionary<string, object> FromJson(string json)
		{
			var result = new Dictionary<string, object>();
			int i = 0;
			SkipWhitespace(json, ref i);
			if (i >= json.Length || json[i] != '{') throw new FormatException("不是合法的JSON对象");
			i++;
			SkipWhitespace(json, ref i);
			if (i < json.Length && json[i] == '}') return result;
			while (i < json.Length)
			{
				SkipWhitespace(json, ref i);
				string key = ParseJsonString(json, ref i);
				SkipWhitespace(json, ref i);
				if (json[i] != ':') throw new FormatException("JSON格式错误，缺少':'");
				i++;
				SkipWhitespace(json, ref i);
				object value = ParseJsonValue(json, ref i);
				result[key] = value;
				SkipWhitespace(json, ref i);
				if (i < json.Length && json[i] == ',') { i++; continue; }
				if (i < json.Length && json[i] == '}') { i++; break; }
				break;
			}
			return result;
		}

		private static void SkipWhitespace(string s, ref int i)
		{
			while (i < s.Length && char.IsWhiteSpace(s[i])) i++;
		}

		private static string ParseJsonString(string s, ref int i)
		{
			if (s[i] != '"') throw new FormatException("JSON格式错误，期望字符串");
			i++;
			var sb = new StringBuilder();
			while (s[i] != '"')
			{
				if (s[i] == '\\')
				{
					i++;
					switch (s[i])
					{
						case 'n': sb.Append('\n'); break;
						case 'r': sb.Append('\r'); break;
						case 't': sb.Append('\t'); break;
						case '"': sb.Append('"'); break;
						case '\\': sb.Append('\\'); break;
						default: sb.Append(s[i]); break;
					}
				}
				else
				{
					sb.Append(s[i]);
				}
				i++;
			}
			i++; // 跳过结尾的引号
			return sb.ToString();
		}

		private static object ParseJsonValue(string s, ref int i)
		{
			if (s[i] == '"') return ParseJsonString(s, ref i);
			if (s[i] == 't' && s.Substring(i, 4) == "true") { i += 4; return true; }
			if (s[i] == 'f' && s.Substring(i, 5) == "false") { i += 5; return false; }
			if (s[i] == 'n' && s.Substring(i, 4) == "null") { i += 4; return null; }
			int start = i;
			while (i < s.Length && (char.IsDigit(s[i]) || s[i] == '-' || s[i] == '+' || s[i] == '.' || s[i] == 'e' || s[i] == 'E')) i++;
			string numStr = s.Substring(start, i - start);
			if (numStr.Contains(".") || numStr.Contains("e") || numStr.Contains("E"))
			{
				return double.Parse(numStr, System.Globalization.CultureInfo.InvariantCulture);
			}
			return long.Parse(numStr, System.Globalization.CultureInfo.InvariantCulture);
		}
	}
}