using System;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

namespace ZJZCGCMemberClient.Method
{
    /// <summary>
    /// 通用的HTTP请求类
    /// </summary>
    public class HttpUtil
    {
        #region 方法 -> HTTP报文请求
        /// <summary>
        /// HTTP报文请求
        /// </summary>
        /// <param name="postDataStr">请求参数</param>
        /// <param name="RequestUrl">请求url</param>
        /// <param name="ContentType">资源的媒体类型，默认application/x-www-form-urlencoded</param>
        /// <param name="timeout">超时时间（TCP连接建立的时间和整个请求完成的时间超出了设置的时间，就抛出异常，程序中断）</param>
        /// <returns></returns>
        public static string HttpUrlPost(string postDataStr, string RequestUrl,
            string ContentType = "application/x-www-form-urlencoded", int timeout = 0)
        {
            try
            {
                CookieContainer cookieContainer = new CookieContainer();
                byte[] postBytes = System.Text.Encoding.UTF8.GetBytes(postDataStr);
                // 设置提交的相关参数
                ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
                HttpWebRequest request = WebRequest.Create(RequestUrl) as HttpWebRequest;
                if (timeout > 0)
                {
                    request.Timeout = timeout * 1000;
                }
                request.Method = "POST";
                request.KeepAlive = false;
                request.ContentType = ContentType;
                request.CookieContainer = cookieContainer;
                request.ContentLength = postBytes.Length;

                using (System.IO.Stream reqStream = request.GetRequestStream())
                {
                    reqStream.Write(postBytes, 0, postBytes.Length);
                }
                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
                {
                    //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, System.Text.Encoding.GetEncoding("utf-8"));
                    string val = reader.ReadToEnd();
                    return val;
                }
            }
            catch (Exception ex)
            {
                SuperMap.RealEstate.Utility.ErrorLogHelper.Write(ex, "Post请求", "Post请求：" + postDataStr + "，" + RequestUrl);
                return ex.ToString();
            }
        }

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