using System;

 using System.Collections.Generic;

 using System.Collections.Specialized;

 using System.Security.Cryptography;

 using System.Text;

 using System.Web;

 using System.Web.Mvc;

 namespace Payment

 {

     public class WireCardController : Controller

     {

         /// <summary>

         /// 创建表单支付

         /// 使用 WireCard 的HPP(Host Payment Page)支付方式

         /// </summary>

         /// <returns></returns>

         public ActionResult Index()

         {

             var reqFormData = new NameValueCollection();

             //表单数据

             reqFormData.Add("request_time_stamp", DateTime.UtcNow.ToString("yyyyMMddHHmmss")); //支付时间：人家指定要UtcNow

             reqFormData.Add("request_id", Guid.NewGuid().ToString()); //请求编号

             reqFormData.Add("merchant_account_id", "your_account_id"); //商户编号：WireCard帐号，等同支付宝帐号，用来打款

             reqFormData.Add("transaction_type", "authorization");

             reqFormData.Add("requested_amount", "100.00"); //付款金额

             reqFormData.Add("requested_amount_currency", "CNY");

             reqFormData.Add("redirect_url", "http://localhost/Payment/WireCard/Result"); //支付结果

             reqFormData.Add("ip_address", "127.0.0.1"); // 本机外网IP：

             reqFormData.Add("secret_key", "secret_key");

             //数字签名，防止传输过程中数据被篡改

             reqFormData.Add("request_signature",

                 getSHA256(

                 reqFormData["request_time_stamp"] +

                 reqFormData["request_id"] +

                 reqFormData["merchant_account_id"] +

                 reqFormData["transaction_type"] +

                 reqFormData["requested_amount"] +

                 reqFormData["requested_amount_currency"] +

                 reqFormData["redirect_url"] +

                 reqFormData["ip_address"] +

                 reqFormData["secret_key"]

                 )

             );

             reqFormData.Add("attempt_three_d", "true"); // With the 3D Secure

             reqFormData.Add("card_type", "mastercard");

             reqFormData.Add("notification_url_1", "http://127.0.0.1/Payment/WireCard/Notification"); //付款事务通知

             reqFormData.Add("notification_transaction_state_1", "success");

             //生成支付表单，自动并提交到付款平台入口

             Response.Write(generalForm(reqFormData, "UTF-8", "https://testapi.ep2-global.com/engine/hpp/"));

             return null;

         }

         /// <summary>

         /// 收到支付事务通知

         /// </summary>

         /// <returns></returns>

         public ActionResult Notification()

         {

             /*

              * 服务端Java做的：

              *

              * 支付平台会包含三个事务步骤，

              * 走完三个步骤才算完成支付，

              * 期间会有三次 Notification

              * 注：返回的状态在Header中，参考三次Headers[request_id]的值的变化，Form里没数据的

              *

              */

             return View();

         }

         /// <summary>

         /// 最终返回支付结果

         /// </summary>

         /// <returns></returns>

         public ActionResult Result()

         {

             /*

              * 最终返回的付款结果，相关支付详细信息都在Form里

              */

             return View();

         }

         /// <summary>

         /// 加密

         /// </summary>

         /// <param name="text"></param>

         /// <returns></returns>

         private string getSHA256(string text)

         {

             byte[] hasValue;

             byte[] message = Encoding.UTF8.GetBytes(text);

             var hashString = new SHA256Managed();

             string hex = "";

             hasValue = hashString.ComputeHash(message);

             foreach (byte x in hasValue)

             {

                 hex += String.Format("{0:x2}", x);

             }

             return hex.Trim();

         }

         /// <summary>

         /// 生成Form表单

         /// </summary>

         /// <param name="collections">Form数据，NameValueCollection</param>

         /// <param name="charset">字符类型</param>

         /// <param name="PostUrl">付款平台的入口</param>

         /// <returns></returns>

         private string generalForm(NameValueCollection collections, string charset, string PostUrl)

         {

             var values = collections;

             var html = new StringBuilder();

             html.AppendLine("<html>").AppendLine("<head>");

             html.AppendFormat("<meta http-equiv=\"Content-Type\" content=\"application/x-www-form-urlencoded; charset={0}\" />", charset).AppendLine();

             html.AppendLine("<style type=\"text/css\">#pay_form { margin: 30px auto 0 auto; width: 700px; text-align: left; } label{ width:250px;} input{ width: 220px;}</style>");

             html.AppendLine("</head>");

             html.AppendLine("<body onload=\"\">"); //javascript:document.pay_form.submit();

             //html.AppendLine("<div id=\"search_flight_loading\"><img src=\"/Content/img/oval.svg\" /></div>");

             html.AppendFormat("<form id=\"pay_form\" name=\"pay_form\" action=\"{0}\" method=\"POST\">", PostUrl).AppendLine();

             foreach (string k in values.AllKeys)

             {

                 html.AppendFormat("<label for=\"{0}\">{0}</label>: <input type=\"text\" name=\"{0}\" id=\"{0}\" value=\"{1}\" readOnly=\"true\" /> <br/>", k, values[k]).AppendLine();

             }

             html.AppendLine("<input type=\"submit\" style=\"display:block;\" value=\"提交\" />");

             html.AppendLine("</form>").AppendLine("</body>").AppendLine("</html>");

             return html.ToString();

         }

     }

 }