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BTCPayServer/Controllers/InvoiceController.PaymentProtocol.cs

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+using BTCPayServer.Filters;
+using Microsoft.Extensions.Logging;
+using BTCPayServer.Logging;
+using Microsoft.AspNetCore.Mvc;
+using NBitcoin;
+using NBitcoin.Payment;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BTCPayServer.Controllers
+{
+    public partial class InvoiceController
+    {
+		[HttpGet]
+		[Route("i/{invoiceId}")]
+		[AcceptMediaTypeConstraint("application/bitcoin-paymentrequest")]
+		public async Task<IActionResult> GetInvoiceRequest(string invoiceId)
+		{
+			var invoice = await _InvoiceRepository.GetInvoice(null, invoiceId);
+			if(invoice == null || invoice.IsExpired())
+				return NotFound();
+
+			var dto = EntityToDTO(invoice);
+			PaymentRequest request = new PaymentRequest
+			{
+				DetailsVersion = 1
+			};
+			request.Details.Expires = invoice.ExpirationTime;
+			request.Details.Memo = invoice.ProductInformation.ItemDesc;
+			request.Details.Network = _Network;
+			request.Details.Outputs.Add(new PaymentOutput() { Amount = dto.BTCDue, Script = BitcoinAddress.Create(dto.BitcoinAddress, _Network).ScriptPubKey });
+			request.Details.MerchantData = Encoding.UTF8.GetBytes(invoice.Id);
+			request.Details.Time = DateTimeOffset.UtcNow;
+			request.Details.PaymentUrl = new Uri(_ExternalUrl.GetAbsolute($"i/{invoice.Id}"), UriKind.Absolute);
+
+			var store = await _StoreRepository.FindStore(invoice.StoreId);
+			if(store == null)
+				throw new BitpayHttpException(401, "Unknown store");
+
+			if(store.StoreCertificate != null)
+			{
+				try
+				{
+					request.Sign(store.StoreCertificate, PKIType.X509SHA256);
+				}
+				catch(Exception ex)
+				{
+					Logs.PayServer.LogWarning(ex, "Error while signing payment request");
+				}
+			}
+
+			return new PaymentRequestActionResult(request);
+		}
+
+		[HttpPost]
+		[Route("i/{invoiceId}", Order = 99)]
+		[MediaTypeConstraint("application/bitcoin-payment")]
+		public async Task<IActionResult> PostPayment(string invoiceId)
+		{
+			var invoice = await _InvoiceRepository.GetInvoice(null, invoiceId);
+			if(invoice == null || invoice.IsExpired())
+				return NotFound();
+			var payment = PaymentMessage.Load(Request.Body);
+			var unused = _Wallet.BroadcastTransactionsAsync(payment.Transactions);
+			await _InvoiceRepository.AddRefundsAsync(invoiceId, payment.RefundTo.Select(p => new TxOut(p.Amount, p.Script)).ToArray());
+			return new PaymentAckActionResult(payment.CreateACK(invoiceId + " is currently processing, thanks for your purchase..."));
+		}
+	}
+}