using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Web;

namespace DataTransferService.HttpClientHelp
{
    public class ESHttpClient
    {
        #region 方法 -> HttpUrlPost
        /// <summary>
        /// 通过POST方式进行HTTP请求
        /// </summary>
        /// <param name="str">发送的数据</param>
        /// <param name="RequestUrl">请求地址</param>
        /// <returns></returns>
        public static string HttpUrlPost(string str, string RequestUrl)
        {
            return HttpUrlPost(str, RequestUrl, "application/x-www-form-urlencoded");
        }
        /// <summary>
        /// 通过POST方式进行HTTP请求
        /// </summary>
        /// <param name="str">发送的数据</param>
        /// <param name="RequestUrl">请求地址</param>
        /// <param name="ContentType">HTTP标头类型</param>
        /// <returns></returns>
        public static string HttpUrlPost(string str, string RequestUrl, string ContentType)
        {
            return HttpUrlPost(str, RequestUrl, ContentType, 0);
        }
        /// <summary>
        /// 通过POST方式进行HTTP请求
        /// </summary>
        /// <param name="str">发送的数据</param>
        /// <param name="RequestUrl">请求地址</param>
        /// <param name="ContentType">HTTP标头类型</param>
        /// <param name="timeout">超时时间</param>
        /// <returns></returns>
        public static string HttpUrlPost(string str, string RequestUrl, string ContentType, int timeout)
        {
            return HttpUrlPost(str, RequestUrl, ContentType, timeout, Encoding.UTF8);
        }
        /// <summary>
        /// 通过POST方式进行HTTP请求
        /// </summary>
        /// <param name="str">发送的数据</param>
        /// <param name="RequestUrl">请求地址</param>
        /// <param name="ContentType">HTTP标头类型</param>
        /// <param name="timeout">超时时间</param>
        /// <param name="encoding">字符编码类型</param>
        /// <returns></returns>
        public static string HttpUrlPost(string str, string RequestUrl, string ContentType, int timeout, Encoding encoding)
        {
            return HttpUrlPost(str, RequestUrl, ContentType, timeout, encoding, true);
        }
        /// <summary>
        /// 通过POST方式进行HTTP请求
        /// </summary>
        /// <param name="str">发送的数据</param>
        /// <param name="RequestUrl">请求地址</param>
        /// <param name="ContentType">HTTP标头类型</param>
        /// <param name="timeout">超时时间</param>
        /// <param name="encoding">字符编码类型</param>
        /// <param name="expect100Continue">是否使用Expect:100-Continue
        /// 调用Java服务接口报500错误时，请传false</param>
        /// <returns></returns>
        public static string HttpUrlPost(string str, string RequestUrl, string ContentType, int timeout, Encoding encoding, bool expect100Continue)
        {
            try
            {
                //SSL证书验证设置
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3
                                       | SecurityProtocolType.Tls
                                       | (SecurityProtocolType)0x300 //Tls11
                                       | (SecurityProtocolType)0xC00; //Tls12
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(RequestUrl);
                if (timeout > 0)
                {
                    request.Timeout = timeout * 1000;
                }
                request.ProtocolVersion = HttpVersion.Version10;
                request.ServicePoint.Expect100Continue = expect100Continue;
                request.Method = "POST";//使用POST模式进行请求
                request.KeepAlive = false;
                request.ContentType = ContentType;//设置HTTP请求标头
                request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
                CookieContainer cookieContainer = new CookieContainer();
                byte[] postBytes = encoding.GetBytes(str);
                request.CookieContainer = cookieContainer;
                request.ContentLength = postBytes.Length;
                //发送请求数据至指定服务
                using (System.IO.Stream reqStream = request.GetRequestStream())
                {
                    //LogHelper.WriteSendLog("==开始写数据==");
                    reqStream.Write(postBytes, 0, postBytes.Length);
                    //LogHelper.WriteSendLog("==写入完成==");
                }
                using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
                {
                    //在这里对接收到的页面内容进行处理
                    //直到request.GetResponse()程序才开始向目标网页发送post请求
                    System.IO.Stream responseStream = response.GetResponseStream();
                    System.IO.StreamReader reader = new System.IO.StreamReader(responseStream, encoding);
                    string val = reader.ReadToEnd();
                    return val;
                }
            }
            catch (WebException ex)
            {
                return ex.Message;
            }
        }

        public static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
        {
            return true;
        }
        #endregion
    }
}