Fix: Using lnaddresses on Nostr should not result in lots of invoice being created

BTCPayServer.Tests/SeleniumTests.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Buffers;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Globalization;
 using System.Linq;
@@ -2379,7 +2380,7 @@ namespace BTCPayServer.Tests
 
             var addresses = s.Driver.FindElements(By.ClassName("lightning-address-value"));
             Assert.Equal(2, addresses.Count);
-
+            var callbacks = new List<Uri>();
             foreach (IWebElement webElement in addresses)
             {
                 var value = webElement.GetAttribute("value");
@@ -2397,6 +2398,7 @@ namespace BTCPayServer.Tests
                         lnaddress2 = m["text/identifier"];
                         Assert.Equal(2, request.MinSendable.ToDecimal(LightMoneyUnit.Satoshi));
                         Assert.Equal(10, request.MaxSendable.ToDecimal(LightMoneyUnit.Satoshi));
+                        callbacks.Add(request.Callback);
                         break;
 
                     case { } v when v.StartsWith(lnaddress1):
@@ -2404,6 +2406,7 @@ namespace BTCPayServer.Tests
                         lnaddress1 = m["text/identifier"];
                         Assert.Equal(1, request.MinSendable.ToDecimal(LightMoneyUnit.Satoshi));
                         Assert.Equal(6.12m, request.MaxSendable.ToDecimal(LightMoneyUnit.BTC));
+                        callbacks.Add(request.Callback);
                         break;
                     default:
                         Assert.False(true, "Should have matched");
@@ -2411,7 +2414,19 @@ namespace BTCPayServer.Tests
                 }
             }
             var repo = s.Server.PayTester.GetService<InvoiceRepository>();
+
             var invoices = await repo.GetInvoices(new InvoiceQuery() { StoreId = new[] { s.StoreId } });
+            // Resolving a ln address shouldn't create any btcpay invoice.
+            // This must be done because some NOST clients resolve ln addresses preemptively without user interaction
+            Assert.Empty(invoices);
+
+            // Calling the callbacks should create the invoices
+            foreach (var callback in callbacks)
+            {
+                using var r = await s.Server.PayTester.HttpClient.GetAsync(callback);
+                await r.Content.ReadAsStringAsync();
+            }
+            invoices = await repo.GetInvoices(new InvoiceQuery() { StoreId = new[] { s.StoreId } });
             Assert.Equal(2, invoices.Length);
             var emailSuffix = $"@{s.Server.PayTester.HostName}:{s.Server.PayTester.Port}";
             foreach (var i in invoices)

BTCPayServer/Controllers/UILNURLController.cs

@@ -3,6 +3,7 @@ using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using System.Linq;
+using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
 using BTCPayServer.Abstractions.Constants;
@@ -373,13 +374,52 @@ namespace BTCPayServer
                 return NotFound("Unknown username");
 
             var store = await _storeRepository.FindStore(lightningAddressSettings.StoreDataId);
+            var cryptoCode = "BTC";
             if (store is null)
                 return NotFound("Unknown username");
+            if (GetLNUrlPaymentMethodId(cryptoCode, store, out var lnUrlMethod) is null)
+                return NotFound("LNUrl not available for store");
 
             var blob = lightningAddressSettings.GetBlob();
 
-            return await GetLNURLRequest(
+            var lnurlRequest = new LNURLPayRequest()
-               "BTC",
+            {
+                Tag = "payRequest",
+                MinSendable = blob?.Min is decimal min ? new LightMoney(min, LightMoneyUnit.Satoshi) : null,
+                MaxSendable = blob?.Max is decimal max ? new LightMoney(max, LightMoneyUnit.Satoshi) : null,
+                CommentAllowed = lnUrlMethod.LUD12Enabled ? 2000 : 0
+            };
+            NormalizeSendable(lnurlRequest);
+
+            var lnUrlMetadata = new Dictionary<string, string>()
+            {
+                ["text/identifier"] = $"{username}@{Request.Host}"
+            };
+            SetLNUrlDescriptionMetadata(lnUrlMetadata, store, store.GetStoreBlob(), null);
+            lnurlRequest.Metadata =
+                JsonConvert.SerializeObject(lnUrlMetadata.Select(kv => new[] { kv.Key, kv.Value }));
+
+            lnurlRequest.Callback = new Uri(_linkGenerator.GetUriByAction(
+                        action: nameof(GetLNURLForLightningAddress),
+                        controller: "UILNURL",
+                        values: new { cryptoCode, username }, Request.Scheme, Request.Host, Request.PathBase));
+
+            lnurlRequest = await _pluginHookService.ApplyFilter("modify-lnurlp-request", lnurlRequest) as LNURLPayRequest;
+            return Ok(lnurlRequest);
+        }
+
+        [HttpGet("pay/lnaddress/{username}")]
+        [EnableCors(CorsPolicies.All)]
+        [IgnoreAntiforgeryToken]
+        public async Task<IActionResult> GetLNURLForLightningAddress(string cryptoCode, string username, [FromQuery] long? amount = null, string comment = null)
+        {
+            var lightningAddressSettings = await _lightningAddressService.ResolveByAddress(username);
+            if (lightningAddressSettings is null || username is null)
+                return NotFound("Unknown username");
+            var blob = lightningAddressSettings.GetBlob();
+            var store = await _storeRepository.FindStore(lightningAddressSettings.StoreDataId);
+            var result = await GetLNURLRequest(
+               cryptoCode,
                store,
                store.GetStoreBlob(),
                new CreateInvoiceRequest()
@@ -396,6 +436,10 @@ namespace BTCPayServer
                {
                    { "text/identifier", $"{username}@{Request.Host}" }
                });
+            if (result is not OkObjectResult ok || ok.Value is not LNURLPayRequest payRequest)
+                return result;
+            var invoiceId = payRequest.Callback.AbsoluteUri.Split('/').Last();
+            return await GetLNURLForInvoice(invoiceId, cryptoCode, amount, comment);
         }
 
 
@@ -482,11 +526,7 @@ namespace BTCPayServer
 
             if (!lnUrlMetadata.ContainsKey("text/plain"))
             {
-                var invoiceDescription = blob.LightningDescriptionTemplate
+                SetLNUrlDescriptionMetadata(lnUrlMetadata, store, blob, i.Metadata);
-                        .Replace("{StoreName}", store.StoreName ?? "", StringComparison.OrdinalIgnoreCase)
-                        .Replace("{ItemDescription}", i.Metadata.ItemDesc ?? "", StringComparison.OrdinalIgnoreCase)
-                        .Replace("{OrderId}", i.Metadata.OrderId ?? "", StringComparison.OrdinalIgnoreCase);
-                lnUrlMetadata.Add("text/plain", invoiceDescription);
             }
 
             lnurlRequest.Tag = "payRequest";
@@ -503,12 +543,7 @@ namespace BTCPayServer
                     lnurlRequest.MaxSendable = lnurlRequest.MinSendable;
             }
 
-            // We don't think BTCPay handle well 0 sats payments, just in case make it minimum one sat.
+            NormalizeSendable(lnurlRequest);
-            if (lnurlRequest.MinSendable is null || lnurlRequest.MinSendable < LightMoney.Satoshis(1.0m))
-                lnurlRequest.MinSendable = LightMoney.Satoshis(1.0m);
-
-            if (lnurlRequest.MaxSendable is null)
-                lnurlRequest.MaxSendable = LightMoney.FromUnit(6.12m, LightMoneyUnit.BTC);
 
             lnurlRequest = await _pluginHookService.ApplyFilter("modify-lnurlp-request", lnurlRequest) as LNURLPayRequest;
             if (paymentMethodDetails.PayRequest is null)
@@ -524,6 +559,25 @@ namespace BTCPayServer
             return lnurlRequest;
         }
 
+        private void SetLNUrlDescriptionMetadata(Dictionary<string, string> lnUrlMetadata, Data.StoreData store, StoreBlob blob, InvoiceMetadata invoiceMetadata)
+        {
+            var invoiceDescription = blob.LightningDescriptionTemplate
+                        .Replace("{StoreName}", store.StoreName ?? "", StringComparison.OrdinalIgnoreCase)
+                        .Replace("{ItemDescription}", invoiceMetadata?.ItemDesc ?? "", StringComparison.OrdinalIgnoreCase)
+                        .Replace("{OrderId}", invoiceMetadata?.OrderId ?? "", StringComparison.OrdinalIgnoreCase);
+            lnUrlMetadata.Add("text/plain", invoiceDescription);
+        }
+
+        private static void NormalizeSendable(LNURLPayRequest lnurlRequest)
+        {
+            // We don't think BTCPay handle well 0 sats payments, just in case make it minimum one sat.
+            if (lnurlRequest.MinSendable is null || lnurlRequest.MinSendable < LightMoney.Satoshis(1.0m))
+                lnurlRequest.MinSendable = LightMoney.Satoshis(1.0m);
+
+            if (lnurlRequest.MaxSendable is null)
+                lnurlRequest.MaxSendable = LightMoney.FromUnit(6.12m, LightMoneyUnit.BTC);
+        }
+
         PaymentMethodId GetLNUrlPaymentMethodId(string cryptoCode, Data.StoreData store, out LNURLPaySupportedPaymentMethod lnUrlSettings)
         {
             lnUrlSettings = null;