BIP21 Support for Wallet spending (#1322)

* BIP21 Support for Wallet spending

* extract bip21 loading to method

* add bip21 parsing test

BTCPayServer.Tests/SeleniumTester.cs

@@ -18,6 +18,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using BTCPayServer.Lightning;
 using BTCPayServer.Lightning.CLightning;
+using BTCPayServer.Models;
 using BTCPayServer.Views.Stores;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
@@ -70,18 +71,18 @@ namespace BTCPayServer.Tests
             Driver.AssertNoError();
         }
 
-        internal void AssertHappyMessage()
+        internal void AssertHappyMessage(StatusMessageModel.StatusSeverity severity = StatusMessageModel.StatusSeverity.Success)
         {
             using var cts = new CancellationTokenSource(20_000);
             while (!cts.IsCancellationRequested)
             {
-                var success = Driver.FindElements(By.ClassName("alert-success")).Where(el => el.Displayed).Any();
+                var success = Driver.FindElements(By.ClassName($"alert-{StatusMessageModel.ToString(severity)}")).Any(el => el.Displayed);
                 if (success)
                     return;
                 Thread.Sleep(100);
             }
             Logs.Tester.LogInformation(this.Driver.PageSource);
-            Assert.True(false, "Should have shown happy message");
+            Assert.True(false, $"Should have shown {severity} message");
         }
 
         public static readonly TimeSpan ImplicitWait = TimeSpan.FromSeconds(10);

BTCPayServer.Tests/SeleniumTests.cs

@@ -9,6 +9,8 @@ using System.Linq;
 using NBitcoin;
 using System.Threading.Tasks;
 using System.Text.RegularExpressions;
+using BTCPayServer.Models;
+using NBitcoin.Payment;
 
 namespace BTCPayServer.Tests
 {
@@ -569,6 +571,21 @@ namespace BTCPayServer.Tests
                 Assert.EndsWith("psbt", s.Driver.Url);
                 s.Driver.FindElement(By.CssSelector("button[value=broadcast]")).ForceClick();
                 Assert.Equal(walletTransactionLink, s.Driver.Url);
+                
+                var bip21 = invoice.EntityToDTO().CryptoInfo.First().PaymentUrls.BIP21;
+                //let's make bip21 more interesting
+                bip21 += "&label=Solid Snake&message=Snake? Snake? SNAAAAKE!";
+                var parsedBip21 = new BitcoinUrlBuilder(bip21, Network.RegTest);
+                s.Driver.FindElement(By.Id("Wallets")).Click();
+                s.Driver.FindElement(By.LinkText("Manage")).Click();
+                s.Driver.FindElement(By.Id("WalletSend")).Click();
+                s.Driver.FindElement(By.Id("bip21parse")).Click();
+                s.Driver.SwitchTo().Alert().SendKeys(bip21);
+                s.Driver.SwitchTo().Alert().Accept();
+                s.AssertHappyMessage(StatusMessageModel.StatusSeverity.Info);
+                Assert.Equal(parsedBip21.Amount.ToString(false), s.Driver.FindElement(By.Id($"Outputs_0__Amount")).GetAttribute("value"));
+                Assert.Equal(parsedBip21.Address.ToString(), s.Driver.FindElement(By.Id($"Outputs_0__DestinationAddress")).GetAttribute("value"));
+                
             }
         }
     }

BTCPayServer/Controllers/WalletsController.cs

@@ -446,12 +446,13 @@ namespace BTCPayServer.Controllers
             }
             return View(model);
         }
+        
 
         [HttpPost]
         [Route("{walletId}/send")]
         public async Task<IActionResult> WalletSend(
             [ModelBinder(typeof(WalletIdModelBinder))]
-            WalletId walletId, WalletSendModel vm, string command = "", CancellationToken cancellation = default)
+            WalletId walletId, WalletSendModel vm, string command = "", CancellationToken cancellation = default, string bip21 = "")
         {
             if (walletId?.StoreId == null)
                 return NotFound();
@@ -462,6 +463,13 @@ namespace BTCPayServer.Controllers
             if (network == null || network.ReadonlyWallet)
                 return NotFound();
             vm.SupportRBF = network.SupportRBF;
+
+            if (!string.IsNullOrEmpty(bip21))
+            {
+                LoadFromBIP21(vm, bip21, network);
+                return View(vm);
+            }
+            
             decimal transactionAmountSum  = 0;
             
             if (command == "add-output")
@@ -477,7 +485,6 @@ namespace BTCPayServer.Controllers
                 vm.Outputs.RemoveAt(index);
                 return View(vm);
             }
-            
 
             if (!vm.Outputs.Any())
             {
@@ -593,6 +600,47 @@ namespace BTCPayServer.Controllers
             
         }
 
+        private void LoadFromBIP21(WalletSendModel vm, string bip21, BTCPayNetwork network)
+        {
+            try
+            {
+                if (bip21.StartsWith(network.UriScheme, StringComparison.InvariantCultureIgnoreCase))
+                {
+                    bip21 = $"bitcoin{bip21.Substring(network.UriScheme.Length)}";
+                }
+
+                var uriBuilder = new NBitcoin.Payment.BitcoinUrlBuilder(bip21, network.NBitcoinNetwork);
+                vm.Outputs = new List<WalletSendModel.TransactionOutput>()
+                {
+                    new WalletSendModel.TransactionOutput()
+                    {
+                        Amount = uriBuilder.Amount.ToDecimal(MoneyUnit.BTC),
+                        DestinationAddress = uriBuilder.Address.ToString(),
+                        SubtractFeesFromOutput = false
+                    }
+                };
+                if (!string.IsNullOrEmpty(uriBuilder.Label) || !string.IsNullOrEmpty(uriBuilder.Message))
+                {
+                    TempData.SetStatusMessageModel(new StatusMessageModel()
+                    {
+                        Severity = StatusMessageModel.StatusSeverity.Info,
+                        Html =
+                            $"Payment {(string.IsNullOrEmpty(uriBuilder.Label) ? string.Empty : $" to {uriBuilder.Label}")} {(string.IsNullOrEmpty(uriBuilder.Message) ? string.Empty : $" for {uriBuilder.Message}")}"
+                    });
+                }
+            }
+            catch (Exception)
+            {
+                TempData.SetStatusMessageModel(new StatusMessageModel()
+                {
+                    Severity = StatusMessageModel.StatusSeverity.Error,
+                    Message = "The provided BIP21 payment URI was malformed"
+                });
+            }
+
+            ModelState.Clear();
+        }
+
         private IActionResult ViewVault(WalletId walletId, PSBT psbt)
         {
             return View("WalletSendVault", new WalletSendVaultModel()

BTCPayServer/Models/StatusMessageModel.cs

@@ -15,26 +15,8 @@ namespace BTCPayServer.Models
         public StatusSeverity Severity { get; set; }
         public bool AllowDismiss { get; set; } = true;
 
-        public string SeverityCSS
+        public string SeverityCSS => ToString(Severity);
-        {
+
-            get
-            {
-                switch (Severity)
-                {
-                    case StatusSeverity.Info:
-                        return "info";
-                    case StatusSeverity.Error:
-                        return "danger";
-                    case StatusSeverity.Success:
-                        return "success";
-                    case StatusSeverity.Warning:
-                        return "warning";
-                    default:
-                        throw new ArgumentOutOfRangeException();
-                }
-            }
-        }
-        
         private void ParseNonJsonStatus(string s)
         {
             Message = s;
@@ -43,6 +25,23 @@ namespace BTCPayServer.Models
                 : StatusSeverity.Success;
         }
 
+        public static string ToString(StatusSeverity severity)
+        {
+            switch (severity)
+            {
+                case StatusSeverity.Info:
+                    return "info";
+                case StatusSeverity.Error:
+                    return "danger";
+                case StatusSeverity.Success:
+                    return "success";
+                case StatusSeverity.Warning:
+                    return "warning";
+                default:
+                    throw new ArgumentOutOfRangeException();
+            }
+        }
+
         public enum StatusSeverity
         {
             Info,

BTCPayServer/Views/Wallets/WalletSend.cshtml

@@ -5,7 +5,14 @@
     ViewData["Title"] = "Manage wallet";
     ViewData.SetActivePageAndTitle(WalletsNavPages.Send);
 }
-
+@if (TempData.HasStatusMessage())
+{
+    <div class="row">
+        <div class="col-md-10 text-center">
+            <partial name="_StatusMessage" />
+        </div>
+    </div>
+}
 <div class="row">
     <div class="@(Model.Outputs.Count==1? "col-lg-6 transaction-output-form": "col-lg-8")">
         <form method="post">
@@ -16,6 +23,7 @@
             <input type="hidden" asp-for="CurrentBalance" />
             <input type="hidden" asp-for="RecommendedSatoshiPerByte" />
             <input type="hidden" asp-for="CryptoCode" />
+            <input type="hidden" name="BIP21" id="BIP21" />
             <ul class="text-danger">
                 @foreach (var errors in ViewData.ModelState.Where(pair => pair.Key == string.Empty && pair.Value.ValidationState == ModelValidationState.Invalid))
                 {
@@ -118,6 +126,7 @@
                     </div>
                 </div>
             }
+            
             <div class="card">
                 <button class="btn btn-light collapsed" type="button" data-toggle="collapse" data-target="#accordian-advanced" aria-expanded="false" aria-controls="accordian-advanced">
                     Advanced settings
@@ -163,6 +172,7 @@
                     </div>
                 </div>
                 <button type="submit" name="command" value="add-output" class="ml-1 btn btn-secondary">Add another destination </button>
+                <button type="button" id="bip21parse" class="ml-1 btn btn-secondary">Parse BIP21</button>
             </div>
         </form>
     </div>

BTCPayServer/wwwroot/js/WalletSend.js

@@ -44,4 +44,12 @@ $(function () {
         updateFiatValue(outputAmountElement);
         return false;
     });
+
+    $("#bip21parse").on("click", function(){
+        var bip21 = prompt("Paste BIP21 here");
+        if(bip21){
+            $("#BIP21").val(bip21);
+            $("form").submit();
+        }
+    });
 });