public void PerformHandShake(HttpRequestBase Request)
{
//Read the PayPals' Instant Pay Notification (IPN) POST
var strFormValues = Encoding.ASCII
.GetString(Request.BinaryRead(Request.ContentLength));
// Create the request back
var req = PayPalServiceHelper
.CreateRequest("https://www.paypal.com/cgi-bin/webscr");
// Set values for the request back
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
var strNewValue = strFormValues + "&cmd=_notify-validate";
req.ContentLength = strNewValue.Length;
//// Write the request back IPN strings
var stOut = new StreamWriter(req.GetRequestStream(), Encoding.ASCII);
stOut.Write(strNewValue);
stOut.Close();
//send the request, read the response
var strResponse = req.GetResponse();
var IPNResponseStream = strResponse.GetResponseStream();
var encode = System.Text.Encoding.GetEncoding("utf-8");
var readStream = new StreamReader(IPNResponseStream, encode);
var read = new char[256];
var count = readStream.Read(read, 0, 256);
string IPNResponse = new string(read, 0, count);
if (IPNResponse == "VERIFIED")
{
//IPN is valid
}
else
{
//IPN is INVALID
}
//tidy up, close streams
if (readStream != null) readStream.Close();
if (strResponse != null) strResponse.Close();
}
private static bool IsValidIPNRequest(HttpRequestBase requestBase)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(GlobalConfig.PayPalSubmitUrl);
//Set values for the request back
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
byte[] param = requestBase.BinaryRead(requestBase.ContentLength);
string strRequest = System.Text.Encoding.ASCII.GetString(param);
strRequest += "&cmd=_notify-validate";
req.ContentLength = strRequest.Length;
//for proxy
//WebProxy proxy = new WebProxy(new Uri("http://*****:*****@"E:\StagingSites\tfc.tv\App_Data\Paypal.txt";
TextWriter w = new StreamWriter(fileFullPath, true);
w.WriteLine(strResponse);
w.Close();
//Log errors
}
catch (Exception) { }
return false;
}
}
public IpnResult Ipn(HttpRequestBase request)
{
var result = new IpnResult();
string postUrl = settings.TestMode
? "https://www.sandbox.paypal.com/cgi-bin/webscr"
: "https://www.paypal.com/cgi-bin/webscr";
//Post back to either sandbox or live
var req = (HttpWebRequest) WebRequest.Create(postUrl);
//Set values for the request back
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
byte[] param = request.BinaryRead(request.ContentLength);
string strRequest = Encoding.ASCII.GetString(param);
string strResponse_copy = strRequest; //Save a copy of the initial info sent by PayPal
strRequest += "&cmd=_notify-validate";
req.ContentLength = strRequest.Length;
//for proxy
//WebProxy proxy = new WebProxy(new Uri("http://url:port#"));
//req.Proxy = proxy;
//Send the request to PayPal and get the response
var streamOut = new StreamWriter(req.GetRequestStream(), Encoding.ASCII);
streamOut.Write(strRequest);
streamOut.Close();
var streamIn = new StreamReader(req.GetResponse().GetResponseStream());
string strResponse = streamIn.ReadToEnd();
streamIn.Close();
if (strResponse == "VERIFIED")
{
//check the payment_status is Completed
//check that txn_id has not been previously processed
//check that receiver_email is your Primary PayPal email
//check that payment_amount/payment_currency are correct
//process payment
// pull the values passed on the initial message from PayPal
NameValueCollection args = HttpUtility.ParseQueryString(strResponse_copy);
var orderId = Convert.ToInt32(args["custom"]);
var amount = Convert.ToDecimal(args["mc_gross"]);
PaymentStatus status;
string paymentNotes;
if (args["receiver_email"] != settings.Email)
{
paymentNotes = string.Format("PayPal recipient expected was {0} but received {1}",
settings.Email, args["receiver_email"]);
status = PaymentStatus.ManualReview;
}
else if (args["test_ipn"] == "1" && !settings.TestMode)
{
paymentNotes = string.Format("PayPal IPN was in test mode but site is not");
status = PaymentStatus.Failed;
}
else if (args["mc_currency"] != settingService.Get<string>(SettingField.CurrencyCode))
{
paymentNotes = string.Format("Expected currency {0} but received {1}",
settingService.Get<string>(SettingField.CurrencyCode), args["mc_currency"]);
status = PaymentStatus.Failed;
}
else
{
paymentNotes = strResponse_copy;
switch (args["payment_status"])
{
case "Canceled_Reversal":
case "Completed":
case "Processed":
status = PaymentStatus.Completed;
break;
case "Denied":
case "Voided":
case "Expired":
case "Failed":
status = PaymentStatus.Failed;
break;
case "Refunded":
case "Reversed":
status = PaymentStatus.Refunded;
break;
case "Pending":
status = PaymentStatus.ManualReview;
break;
default:
status = PaymentStatus.Failed;
break;
}
}
paymentHelper.LogPayment(orderId, GetType().Name, status, amount, paymentNotes);
}
else if (strResponse == "INVALID")
{
//log for manual investigation
ErrorLog.GetDefault(HttpContext.Current).Log(
new Error(new Exception("PayPal INVALID: " + strResponse_copy)));
}
else
{
//log response/ipn data for manual investigation
ErrorLog.GetDefault(HttpContext.Current).Log(
new Error(new Exception("PayPal " + strResponse + ": " + strResponse_copy)));
}
return result;
}
/// <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 static string IPNHandler(HttpRequestBase requestBase)
{
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(GlobalConfig.PayPalSubmitUrl);
//Set values for the request back
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
byte[] param = requestBase.BinaryRead(requestBase.ContentLength);
string strRequest = System.Text.Encoding.ASCII.GetString(param);
strRequest += "&cmd=_notify-validate";
req.ContentLength = strRequest.Length;
//for proxy
//WebProxy proxy = new WebProxy(new Uri("http://url:port#"));
//req.Proxy = proxy;
//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());
string strResponse = streamIn.ReadToEnd();
streamIn.Close();
return strResponse;
}
