using Newtonsoft.Json.Linq;
using System.Net;
using System.Text;

namespace ConsoleApp1
{
    #region 1.根据文档物理文件id获取文档流数据
    public class WarehouseDownloadDoc()
    {
        private string _cloudUrl = "http://121.36.245.199/k3cloud";
        private string _warehouse = "http://192.168.30.251/CloudPLMWarehouse";

        #region 文档服务器上下文
        private string WarehouseCTX
        {
            get
            {
                string json = "{\"ap1\":{ \"AcctID\":\"" + "61ce591aee4c5a" + "\",\"Username\":\"Administrator\",\"Password\":\"Yc123456@\",\"Lcid\":2052,\"AuthenticateType\":1,\"PasswordIsEncrypted\":\"false\",\"ClientInfo\":{\"ClientType\":8}}";
                var resp = GetResponse("http://121.36.245.199/k3cloud/Kingdee.BOS.ServiceFacade.ServicesStub.User.UserService.ValidateLoginInfo.common.kdsvc", json, new Dictionary<string, string>());
                string ret = (new StreamReader(resp.GetResponseStream(), Encoding.UTF8)).ReadToEnd();
                var result = JObject.Parse(ret)["Context"];
                string token = result["UserToken"].ToString();
                var warehouseCtx = string.Format("LoginUrl={0}&KDServiceSessionId={1}", _cloudUrl, JObject.Parse(ret)["KDSVCSessionId"].ToString());//安全新方式
                return Convert.ToBase64String(Encoding.UTF8.GetBytes(warehouseCtx));
            }
        }
        #endregion

        #region 物理文件id
        private string GetFileId(string fileId)
        {
            return Convert.ToBase64String(Encoding.UTF8.GetBytes(fileId));
        }
        #endregion

        #region 电子仓访问凭证
        private string Token
        {
            get
            {
                var token = Guid.NewGuid().ToString();
                return token;
            }
        }
        #endregion

        #region 发送请求
        public Stream SendRequest(string op, string fileId)
        {
            var header = new Dictionary<string, string>()
            {
                {"FileID" ,GetFileId(fileId) },
                { "CTX",WarehouseCTX},
                { "token", Token },
                { "PLM_ACCESS_TYPE","pure" }
            };
            return PostDataViaHttpWebRequest(RequestUrl(op), string.Empty, header, !op.Equals("Download"));
        }
        #endregion

        #region 请求的URL
        private string RequestUrl(string op)
        {
            return _warehouse + "/" + op;
        }
        #endregion

        #region 获取响应
        private HttpWebResponse GetResponse(string url, string bodyJson, Dictionary<string, string> header)
        {
            byte[] data = Encoding.UTF8.GetBytes(bodyJson);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = WebRequestMethods.Http.Post;
            request.ContentType = "application/json";
            request.ContentLength = data.Length;
            if (header != null)
            {
                foreach (var p in header)
                {
                    request.Headers.Add(p.Key, p.Value);
                }
            }

            using (Stream reqStream = request.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();
            }

            HttpWebResponse resp = null;
            try
            {
                resp = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                var res = ex.Response;
                if (res != null)
                {
                    string statusBase64 = ((HttpWebResponse)ex.Response).StatusDescription;//base64编码后的报错信息
                }
            }
            return resp;
        }
        #endregion

        #region 保存文件到本地
        /*private void PostDataViaHttpWebRequest(string url, string bodyJson, Dictionary<string, string> header, bool isGetContent)
        {

            var resp = GetResponse(url, bodyJson, header);
            var resultJson = string.Empty;
            Stream stream = File.Open("D://DownloadDocDemo.pdf", FileMode.OpenOrCreate);
            int packageSize = 1024 * 1024;
            byte[] buffer = new byte[packageSize];
            using (stream)
            {
                using (Stream outputStream = resp.GetResponseStream())
                {
                    int readLength = 0;
                    while ((readLength = outputStream.Read(buffer, 0, packageSize)) > 0)
                    {
                        stream.Write(buffer, 0, readLength);
                        stream.Flush();
                    }
                    outputStream.Close();
                }
                stream.Close();
            }
        }*/
        #endregion

        #region 返回文件流给前端
        private Stream PostDataViaHttpWebRequest(string url, string bodyJson, Dictionary<string, string> header, bool isGetContent)
        {

            var resp = GetResponse(url, bodyJson, header);

            return resp.GetResponseStream(); // 直接返回响应流
        }
        #endregion
    }
    #endregion
}