using Newtonsoft.Json;

using System;

using System.Collections.Generic;

using System.IO;

using System.Net;

using System.Net.Security;

using System.Security.Cryptography.X509Certificates;

using System.Text;

namespace ZhuoHuiSchoolRoom.ZhuoHuiClass

{

    class HttpWebResponseUtility

    {

        private static readonly string DefaultUserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";

        /// <summary>

        /// 创建GET方式的HTTP请求

        /// </summary>

        /// <param name="url">请求的URL</param>

        /// <param name="timeout">请求的超时时间</param>

        /// <param name="userAgent">请求的客户端浏览器信息，可以为空</param>

        /// <param name="cookies">随同HTTP请求发送的Cookie信息，如果不需要身份验证可以为空</param>

        /// <returns></returns>

        public static HttpWebResponse CreateGetHttpResponse(string url, int? timeout, string userAgent, CookieCollection cookies)

        {

            if (string.IsNullOrEmpty(url))

            {

                throw new ArgumentNullException("url");

            }

            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

            request.Method = "GET";

            request.UserAgent = DefaultUserAgent;

            if (!string.IsNullOrEmpty(userAgent))

            {

                request.UserAgent = userAgent;

            }

            if (timeout.HasValue)

            {

                request.Timeout = timeout.Value;

            }

            if (cookies != null)

            {

                request.CookieContainer = new CookieContainer();

                request.CookieContainer.Add(cookies);

            }

            return request.GetResponse() as HttpWebResponse;

        }

        /// <summary>

        /// 创建POST方式的HTTP请求

        /// </summary>

        /// <param name="url">请求的URL</param>

        /// <param name="str">json字符串</param>

        /// <param name="requestEncoding">发送HTTP请求时所用的编码</param>

        /// <returns></returns>

        public static HttpWebResponse CreatePostHttpResponse(string url, string str, Encoding requestEncoding)

        {

            if (string.IsNullOrEmpty(url))

            {

                throw new ArgumentNullException("url");

            }

            if (requestEncoding == null)

            {

                throw new ArgumentNullException("requestEncoding");

            }

            HttpWebRequest request = null;

            request = WebRequest.Create(url) as HttpWebRequest;

            request.Method = "POST";

            request.ContentType = "application/json;charset=utf-8";

            request.UserAgent = DefaultUserAgent;

            byte[] data = requestEncoding.GetBytes(str.ToString()); //将json转为二进制流

            using (Stream stream = request.GetRequestStream())

            {

                stream.Write(data, , data.Length);

            }

            return request.GetResponse() as HttpWebResponse;

        }

        /// <summary>

        /// 创建DELETE方式的HTTP请求

        /// </summary>

        /// <param name="url">请求地址</param>

        /// <returns></returns>

        public static HttpWebResponse CreateDeleteHttpResponse(string url)

        {

            HttpWebRequest request = null;

            string urlPath = url;

            int millisecond = ;

            request = (HttpWebRequest)WebRequest.Create(urlPath);

            //request.Proxy = null;//关闭代理（重要）

            request.Timeout = millisecond;

            request.Method = "DELETE";

            //request.Accept = "application/json";

            //request.ContentType = "application/json";

            request.ServicePoint.Expect100Continue = false;

            return request.GetResponse() as HttpWebResponse;

        }

        private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)

        {

            return true; //总是接受

        }

        /// <summary>

        /// HttpPost上传多个文件

        /// </summary>

        /// <param name="url">请求地址</param>

        /// <param name="pathList">路径集合</param>

        /// <returns></returns>

        public static HttpWebResponse HttpUploadFile(string url, List<string> pathList)

        {

            // 设置参数

            HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

            CookieContainer cookieContainer = new CookieContainer();

            request.CookieContainer = cookieContainer;

            request.AllowAutoRedirect = true;

            request.Method = "POST";

            string boundary = "----" + DateTime.Now.Ticks.ToString("x"); // 随机分隔线

            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;

            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");

            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");

            Stream postStream = request.GetRequestStream();

            for (int i = ; i < pathList.Count; i++)

            {

                int pos = pathList[i].LastIndexOf("\\");

                string fileName = pathList[i].Substring(pos + ); //取文件名

                                                                  //请求头部信息

                StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name=\"file\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName));

                byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

                FileStream fs = new FileStream(pathList[i], FileMode.Open, FileAccess.Read);

                byte[] bArr = new byte[fs.Length];

                fs.Read(bArr, , bArr.Length);

                fs.Close();

                postStream.Write(itemBoundaryBytes, , itemBoundaryBytes.Length);

                postStream.Write(postHeaderBytes, , postHeaderBytes.Length);

                postStream.Write(bArr, , bArr.Length);

            }

            postStream.Write(endBoundaryBytes, , endBoundaryBytes.Length);

            postStream.Close();

            //发送请求并获取相应回应数据

            return request.GetResponse() as HttpWebResponse;

        }

    }

}