/// <summary>
/// Handles the offsite notification send by them via async call.
/// </summary>
/// <param name="orderNumber">The order number.</param>
/// <param name="request">The HTTP request object .</param>
/// <param name="paymentMethod">The payment method which is used.</param>
/// <returns></returns>
public IPaymentResponse HandleOffsiteNotification(int orderNumber, HttpRequest request, PaymentMethod paymentMethod)
{
IPaymentResponse response = new PaymentResponse()
{
IsOffsitePayment = true
};
//Extract the BitPay settings object
this.bitPaySettings = (BitPaySettings)PaymentProcessorHelper.DeserializePaymentSettings <BitPaySettings>(paymentMethod);
BitPayServerResponse bitpayServerResponce = GetBitPayServiceResponce(request);
bool isNotificationValid = CheckIfNotificationIsValid(orderNumber, bitpayServerResponce);
if (!isNotificationValid)
{
response.GatewayFraudResponse = "BitPay Payment response not valid for this order.";
return(response);
}
var paymentStatus = bitpayServerResponce.Status;
if (!paymentStatus.IsNullOrEmpty())
{
//check for successful
if (paymentStatus == TheBitPayStatusConfirmed || paymentStatus == TheBitPayStatusComplete)
{
response.IsSuccess = true;
}
}
return(response);
}
private static BitPayServerResponse ParseBitPayServerResponce(string responseJson)
{
BitPayServerResponse bitpayServerResponce = null;
using (MemoryStream stream = new MemoryStream(System.Text.Encoding.GetEncoding("utf-8").GetBytes(responseJson)))
{
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(BitPayServerResponse));
bitpayServerResponce = (BitPayServerResponse)serializer.ReadObject(stream);
}
return(bitpayServerResponce);
}
/// <summary>
/// Submits a sale request to the payment processor
/// </summary>
/// <param name="data">An instance of type <see cref="IPaymentRequest" /></param>
/// <returns>An instance of type <see cref="IPaymentResponse" /></returns>
public IPaymentResponse Sale(IPaymentRequest data)
{
BitPayServerResponse bitpayServerResponce = CreateInvoiceRequest(data);
NameValueCollection createPaymentPostValues = new NameValueCollection();
createPaymentPostValues.Add("id", bitpayServerResponce.Id);
IPaymentResponse response = CreatePaymentResponse(data.OrderNumber, createPaymentPostValues);
return(response);
}
private static BitPayServerResponse GetBitPayServiceResponce(HttpRequest request)
{
string jsonString = String.Empty;
HttpContext.Current.Request.InputStream.Position = 0;
using (StreamReader inputStream = new StreamReader(request.InputStream))
{
jsonString = inputStream.ReadToEnd();
}
BitPayServerResponse bitpayServerResponce = ParseBitPayServerResponce(jsonString);
return(bitpayServerResponce);
}
/// <summary>
/// Makes an Create invoice request and returns the BitPay server response
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private BitPayServerResponse CreateInvoiceRequest(IPaymentRequest data)
{
NameValueCollection headerValues = new NameValueCollection();
byte[] encodedByteApiKey = System.Text.ASCIIEncoding.ASCII.GetBytes(this.bitPaySettings.ApiKey);
string base64EncodedApiKey = Convert.ToBase64String(encodedByteApiKey);
headerValues.Add("Authorization", "Basic " + base64EncodedApiKey);
NameValueCollection postValues = GetPostValues(data);
string responseJson = base.PostWebRequest(this.bitPaySettings.CreateInvoiceUrl, headerValues, postValues, Timeout);
BitPayServerResponse bitpayServerResponce = ParseBitPayServerResponce(responseJson);
return(bitpayServerResponce);
}
/// <summary>
/// Verifies if the order status changed notification is valid
/// </summary>
private bool CheckIfNotificationIsValid(int orderNumber, BitPayServerResponse bitpayServerResponce)
{
if (bitpayServerResponce == null)
{
return(false);
}
// We check if the hash stored in the posData propery of the BitPay responce is valid
// We use this hash to confirm that the Notification is actually coming from BitPay
// In order to check the hash we regenerate it the same way it was generated earlier in the Invoice request
string orderHash = MD5.ComputeHashHex(
String.Format("{0}:{1}:{2}", this.bitPaySettings.ApiKey, orderNumber.ToString(), this.bitPaySettings.TransactionSpeed));
var posData = bitpayServerResponce.PosData;
if (posData.IsNullOrEmpty() || posData != orderHash)
{
return(false);
}
return(true);
}
