public string PayWithPayPal(int id,
string returnUrl,
string cancelUrl,
string ipnUrl,
string senderEmail,
IEnumerable<PaymentItem> payments,
IPaymentHandler paymentHandler,
PaymentConstants config)
{
HttpWebRequest request;
WebResponse response = null;
StreamReader reader = null;
string resultUrl = null;
try
{
request = CreatePaypalRequest(PayPalConstants.MessageFormat.NameValue, PayPalConstants.MessageFormat.Xml, config);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
string postData = "&actionType=PAY";
postData += "&senderMail=" + senderEmail;
postData += "&cancelUrl=" + cancelUrl;
postData += "&ipnNotificationUrl=" + ipnUrl;
postData += "¤cyCode=" + "EUR";
postData += "&feesPayer=" + PayPalConstants.FeePayer.EachReceiver;
foreach (var payment in payments)
{
postData += "&receiverList.receiver(" + payment.Index.ToString() + ").amount=" + payment.Amount.ToString("F");
postData += "&receiverList.receiver(" + payment.Index.ToString() + ").email=" + payment.Email;
}
postData += "&requestEnvelope.errorLanguage=" + "en_US";
postData += "&returnUrl=" + returnUrl;
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
response = request.GetResponse();
dataStream = response.GetResponseStream();
reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
XmlDocument xdoc = new XmlDocument();
xdoc.LoadXml(responseFromServer);
XmlNodeList nodes = xdoc.GetElementsByTagName("ack");
if (nodes.Count > 0)
{
string ackMessage = nodes[0].InnerText;
if (!string.IsNullOrEmpty(ackMessage))
{
nodes = xdoc.GetElementsByTagName("payKey");
if (nodes.Count > 0)
{
string payKey = nodes[0].InnerText.Trim();
if (ackMessage.ToLower() == "success")
{
if (paymentHandler.CreateTransactions(id, payKey, payments))
{
resultUrl = config.ApprovalUrl + payKey;
}
}
else
{
_Logger.Error("Paypal: API call failure\r\n" + responseFromServer);
}
}
else
{
throw new Exception("Paypal: invalid API response XML format");
}
}
else
{
throw new Exception("Paypal: invalid API response XML format");
}
}
else
{
throw new Exception("Paypal: invalid API response XML format");
}
}
catch (Exception ex)
{
_Logger.Error(ex.Message);
}
finally
{
if (reader != null)
{
reader.Close();
}
if (response != null)
{
response.Close();
}
}
return resultUrl;
}
/// <summary>
/// Create a HttpWebRequest for Paypal with required Headers
/// </summary>
/// <param name="requestFormat">Format of data sent to Paypal</param>
/// <param name="responseFormat">Format of data received from Paypal</param>
/// <returns>created request</returns>
private HttpWebRequest CreatePaypalRequest(string requestFormat, string responseFormat, PaymentConstants config)
{
string url = config.PaymentUrl;
string applicationId = config.ApiTestApplicationId;
string ip = HttpContext.Current.Request.ServerVariables["LOCAL_ADDR"];
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Headers.Add("X-PAYPAL-SECURITY-USERID", config.ApiUsername);
request.Headers.Add("X-PAYPAL-SECURITY-PASSWORD", config.ApiPassword);
request.Headers.Add("X-PAYPAL-SECURITY-SIGNATURE", config.ApiSignature);
request.Headers.Add("X-PAYPAL-DEVICE-IPADDRESS", ip);
request.Headers.Add("X-PAYPAL-REQUEST-DATA-FORMAT", requestFormat);
request.Headers.Add("X-PAYPAL-RESPONSE-DATA-FORMAT", responseFormat);
request.Headers.Add("X-PAYPAL-APPLICATION-ID", applicationId);
return request;
}
/// <summary>
/// Validate the paypal request via postbackurl
/// </summary>
/// <param name="paypalRequest">the request to validate</param>
/// <returns>string telling if paypalrequest is valid</returns>
private string ValidateIPNRequest(HttpRequestBase paypalRequest, PaymentConstants config)
{
string strResponse = null;
try
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(config.PostbackUrl);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
byte[] param = paypalRequest.BinaryRead(HttpContext.Current.Request.ContentLength);
string strRequest = Encoding.ASCII.GetString(param);
strRequest += "&cmd=_notify-validate";
req.ContentLength = strRequest.Length;
//Send the request to PayPal and get the response
StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
streamOut.Write(strRequest);
streamOut.Close();
StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
strResponse = streamIn.ReadToEnd();
streamIn.Close();
}
catch (Exception ex)
{
_Logger.Error("ValidateIPNRequest", ex);
}
return strResponse;
}
public List<string> ProcessPaypalIPNMessage(HttpRequestBase paypalRequest, out string status, out string requestId, PaymentConstants config)
{
List<string> errors = new List<string>();
string strResponse = ValidateIPNRequest(paypalRequest, config);
status = string.Empty;
requestId = string.Empty;
try
{
if (strResponse != null)
{
if (strResponse == "VERIFIED")
{
status = paypalRequest.Form["status"];
if (!string.IsNullOrEmpty(status))
{
status = status.ToUpper();
requestId = paypalRequest.Form["pay_key"];
string tr1 = paypalRequest["transaction[0].id"];
string tr1Str = paypalRequest["transaction[0].amount"].Split()[1];
var tr1Amount = decimal.Parse(tr1Str);
//decimal.TryParse(paypalRequest["transaction[0].amount"], NumberStyles.Currency, null, out tr1Amount);
var payments = new List<PaymentItem>
{
new PaymentItem{ Index = 0, Amount = tr1Amount, TransactionId = tr1}
};
string tr2 = paypalRequest["transaction[1].id"];
if (tr2 != null)
{
string tr2Str = paypalRequest["transaction[1].amount"].Split()[1];
var tr2Amount = decimal.Parse(tr2Str);
payments.Add(new PaymentItem { Index = 1, Amount = tr2Amount, TransactionId = tr2 });
}
var context = ModelFactory.GetUnitOfWork();
var tRepo = ModelFactory.GetRepository<ITransactionRepository>(context);
var type = tRepo.GetHandlerType(requestId);
var paymentHandler = PaymentHandlerFactory.GetHandler(type);
switch (status)
{
case "COMPLETED":
if (!paymentHandler.CompleteTransactions(requestId, payments))
{
string message = "Paypal: CompleteTransactions failed\r\n";
message += "Client IP : " + paypalRequest.UserHostAddress + "\r\n";
message += "Request : " + paypalRequest.RawUrl;
errors.Add(message);
_Logger.Error(message);
}
break;
case "INCOMPLETE":
case "ERROR":
case "PROCESSING": // Do something?
case "PENDING": // Do something?
default: break;
}
}
else
{
string message = "Paypal: no status found in IPN message\r\n";
message += "Client IP : " + paypalRequest.UserHostAddress + "\r\n";
message += "Request : " + paypalRequest.RawUrl;
errors.Add(message);
_Logger.Error(message);
}
}
else
{
string message = "Paypal: invalid Paypal IPN message\r\n";
message += "Client IP : " + paypalRequest.UserHostAddress + "\r\n";
message += "Request : " + paypalRequest.RawUrl;
errors.Add(message);
_Logger.Error(message);
}
}
else
{
string message = "Paypal : cannot validate IPN request";
errors.Add(message);
_Logger.Error(message);
}
}
catch (Exception ex)
{
errors.Add(ex.Message);
_Logger.Error("ProcessPaypalIPNMessage", ex);
}
return errors;
}
