Expose LND gRPC settings

BTCPayServer/BTCPayServer.csproj

@@ -114,6 +114,15 @@
 	  <Folder Include="wwwroot\vendor\highlightjs\" />
 	</ItemGroup>
 
+	<ItemGroup>
+	  <Content Update="Views\Server\LNDGRPCServices.cshtml">
+	    <Pack>$(IncludeRazorContentInPack)</Pack>
+	  </Content>
+	  <Content Update="Views\Server\Services.cshtml">
+	    <Pack>$(IncludeRazorContentInPack)</Pack>
+	  </Content>
+	</ItemGroup>
+
 	<ItemGroup>
 	  <None Update="devtest.pfx">
 	    <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>

BTCPayServer/Controllers/ServerController.cs

@@ -1,6 +1,8 @@
-using BTCPayServer.HostedServices;
+using BTCPayServer.Configuration;
+using BTCPayServer.HostedServices;
 using BTCPayServer.Models;
 using BTCPayServer.Models.ServerViewModels;
+using BTCPayServer.Payments.Lightning;
 using BTCPayServer.Services;
 using BTCPayServer.Services.Mails;
 using BTCPayServer.Services.Rates;
@@ -9,6 +11,7 @@ using BTCPayServer.Validations;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
+using NBitcoin.DataEncoders;
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
@@ -27,16 +30,22 @@ namespace BTCPayServer.Controllers
         SettingsRepository _SettingsRepository;
         private BTCPayRateProviderFactory _RateProviderFactory;
         private StoreRepository _StoreRepository;
+        LightningConfigurationProvider _LnConfigProvider;
+        BTCPayServerOptions _Options;
 
         public ServerController(UserManager<ApplicationUser> userManager,
+            Configuration.BTCPayServerOptions options,
             BTCPayRateProviderFactory rateProviderFactory,
             SettingsRepository settingsRepository,
+            LightningConfigurationProvider lnConfigProvider,
             Services.Stores.StoreRepository storeRepository)
         {
+            _Options = options;
             _UserManager = userManager;
             _SettingsRepository = settingsRepository;
             _RateProviderFactory = rateProviderFactory;
             _StoreRepository = storeRepository;
+            _LnConfigProvider = lnConfigProvider;
         }
 
         [Route("server/rates")]
@@ -225,6 +234,121 @@ namespace BTCPayServer.Controllers
             return View(settings);
         }
 
+        [Route("server/services")]
+        public IActionResult Services()
+        {
+            var result = new ServicesViewModel();
+            foreach (var internalNode in _Options.InternalLightningByCryptoCode)
+            {
+                //Only BTC can be supported because gRPC does not allow http path rewriting.
+                if (internalNode.Key == "BTC" && GetExternalLNDConnectionString(internalNode.Value) != null)
+                {
+                    result.LNDServices.Add(new ServicesViewModel.LNDServiceViewModel()
+                    {
+                        Crypto = internalNode.Key,
+                        Type = "gRPC"
+                    });
+                }
+            }
+            return View(result);
+        }
+
+        private LightningConnectionString GetExternalLNDConnectionString(LightningConnectionString value)
+        {
+            if (value.ConnectionType != LightningConnectionType.LndREST)
+                return null;
+            var external = new LightningConnectionString();
+            external.ConnectionType = LightningConnectionType.LndREST;
+            external.BaseUri = _Options.ExternalUrl ?? value.BaseUri;
+            if (external.BaseUri.Scheme == "http" || value.AllowInsecure)
+            {
+                external.AllowInsecure = true;
+            }
+
+            try
+            {
+                if (value.MacaroonFilePath != null)
+                    external.Macaroon = System.IO.File.ReadAllBytes(value.MacaroonFilePath);
+            }
+            catch
+            {
+                return null;
+            }
+            if (value.Macaroon != null)
+                external.Macaroon = value.Macaroon;
+
+            // If external url is provided, then we don't care about cert thumbprint
+            // because we override it at the reverse proxy level with a trusted certificate
+            if (_Options.ExternalUrl == null)
+            {
+                if (value.CertificateThumbprint != null)
+                {
+                    external.CertificateThumbprint = value.CertificateThumbprint;
+                    external.AllowInsecure = false;
+                }
+            }
+            return external;
+        }
+
+        [Route("server/services/lnd-grpc/{cryptoCode}")]
+        public IActionResult LNDGRPCServices(string cryptoCode, ulong? secret)
+        {
+            if (!_Options.InternalLightningByCryptoCode.TryGetValue(cryptoCode.ToUpperInvariant(), out var connectionString))
+                return NotFound();
+            var model = new LNDGRPCServicesViewModel();
+            var external = GetExternalLNDConnectionString(connectionString);
+
+            model.Host = external.BaseUri.DnsSafeHost;
+            model.Port = external.BaseUri.Port;
+            model.SSL = external.BaseUri.Scheme == "https";
+            if (external.CertificateThumbprint != null)
+            {
+                model.CertificateThumbprint = Encoders.Hex.EncodeData(external.CertificateThumbprint);
+            }
+            if (external.Macaroon != null)
+            {
+                model.Macaroon = Encoders.Hex.EncodeData(external.Macaroon);
+            }
+            if (secret != null)
+            {
+                var lnConfig = _LnConfigProvider.GetConfig(secret.Value);
+                if (lnConfig != null)
+                {
+                    model.QRCode = $"config={this.Request.GetAbsoluteRoot().WithTrailingSlash()}lnd-config/{secret.Value}/lnd.config";
+                }
+            }
+            return View(model);
+        }
+        [Route("lnd-config/{secret}/lnd.config")]
+        public IActionResult GetLNDConfig(ulong secret)
+        {
+            var conf = _LnConfigProvider.GetConfig(secret);
+            if (conf == null)
+                return NotFound();
+            return Json(conf);
+        }
+
+        [Route("server/services/lnd-grpc/{cryptoCode}")]
+        [HttpPost]
+        public IActionResult LNDGRPCServicesPOST(string cryptoCode)
+        {
+            if (!_Options.InternalLightningByCryptoCode.TryGetValue(cryptoCode.ToUpperInvariant(), out var connectionString))
+                return NotFound();
+            var external = GetExternalLNDConnectionString(connectionString);
+            LightningConfigurations confs = new LightningConfigurations();
+            LightningConfiguration conf = new LightningConfiguration();
+            conf.Type = "grpc";
+            conf.CryptoCode = cryptoCode;
+            conf.Host = external.BaseUri.DnsSafeHost;
+            conf.Port = external.BaseUri.Port;
+            conf.SSL = external.BaseUri.Scheme == "https";
+            conf.Macaroon = external.Macaroon == null ? null : Encoders.Hex.EncodeData(external.Macaroon);
+            conf.CertificateThumbprint = external.CertificateThumbprint == null ? null : Encoders.Hex.EncodeData(external.CertificateThumbprint);
+            confs.Configurations.Add(conf);
+            var secret = _LnConfigProvider.KeepConfig(confs);
+            return RedirectToAction(nameof(LNDGRPCServices), new { cryptoCode = cryptoCode, secret = secret });
+        }
+
         [Route("server/theme")]
         public async Task<IActionResult> Theme()
         {

BTCPayServer/Hosting/BTCPayServerServices.cs

@@ -92,6 +92,7 @@ namespace BTCPayServer.Hosting
                 return opts.NetworkProvider;
             });
 
+            services.TryAddSingleton<LightningConfigurationProvider>();
             services.TryAddSingleton<LanguageService>();
             services.TryAddSingleton<NBXplorerDashboard>();
             services.TryAddSingleton<StoreRepository>();

BTCPayServer/Models/ServerViewModels/LNDGRPCServicesViewModel.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace BTCPayServer.Models.ServerViewModels
+{
+    public class LNDGRPCServicesViewModel
+    {
+        public string Host { get; set; }
+        public int Port { get; set; }
+        public bool SSL { get; set; }
+        public string Macaroon { get; set; }
+        public string CertificateThumbprint { get; set; }
+        public string QRCode { get; set; }
+    }
+}

BTCPayServer/Models/ServerViewModels/ServicesViewModel.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace BTCPayServer.Models.ServerViewModels
+{
+    public class ServicesViewModel
+    {
+        public class LNDServiceViewModel
+        {
+            public string Crypto { get; set; }
+            public string Type { get; set; }
+        }
+        public List<LNDServiceViewModel> LNDServices { get; set; } = new List<LNDServiceViewModel>();
+    }
+}

BTCPayServer/Payments/Lightning/LightningConnectionString.cs

@@ -353,7 +353,7 @@ namespace BTCPayServer.Payments.Lightning
         public LightningConnectionType ConnectionType
         {
             get;
-            private set;
+            set;
         }
         public byte[] Macaroon { get; set; }
         public string MacaroonFilePath { get; set; }

BTCPayServer/Services/LightningConfigurationProvider.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using NBitcoin;
+
+namespace BTCPayServer.Services
+{
+    public class LightningConfigurationProvider
+    {
+        ConcurrentDictionary<ulong, (DateTimeOffset expiration, LightningConfigurations config)> _Map = new ConcurrentDictionary<ulong, (DateTimeOffset expiration, LightningConfigurations config)>();
+        public ulong KeepConfig(LightningConfigurations configuration)
+        {
+            CleanExpired();
+            var secret = RandomUtils.GetUInt64();
+            _Map.AddOrReplace(secret, (DateTimeOffset.UtcNow + TimeSpan.FromMinutes(10), configuration));
+            return secret;
+        }
+
+        public LightningConfigurations GetConfig(ulong secret)
+        {
+            CleanExpired();
+            if (!_Map.TryGetValue(secret, out var value))
+                return null;
+            return value.config;
+        }
+
+        private void CleanExpired()
+        {
+            foreach(var item in _Map)
+            {
+                if(item.Value.expiration < DateTimeOffset.UtcNow)
+                {
+                    _Map.TryRemove(item.Key, out var unused);
+                }
+            }
+        }
+    }
+
+    public class LightningConfigurations
+    {
+        public List<LightningConfiguration> Configurations { get; set; } = new List<LightningConfiguration>();
+    }
+    public class LightningConfiguration
+    {
+        public string Type { get; set; }
+        public string CryptoCode { get; set; }
+        public string Host { get; set; }
+        public int Port { get; set; }
+        public bool SSL { get; set; }
+        public string CertificateThumbprint { get; set; }
+        public string Macaroon { get; set; }
+    }
+}

BTCPayServer/Views/Server/LNDGRPCServices.cshtml

@@ -0,0 +1,96 @@
+@model BTCPayServer.Models.ServerViewModels.LNDGRPCServicesViewModel
+@{
+    ViewData.SetActivePageAndTitle(ServerNavPages.Services);
+}
+
+
+<h4>GRPC settings</h4>
+<partial name="_StatusMessage" for="@TempData["StatusMessage"]" />
+<div class="row">
+    <div class="col-md-6">
+        <div asp-validation-summary="All" class="text-danger"></div>
+    </div>
+</div>
+
+<div class="row">
+
+    <div class="col-md-8">
+        <div class="form-group">
+            <p>
+                <span>BTCPay exposes gRPC services for outside consumption, you will find connection informaiton here.<br /></span>
+            </p>
+        </div>
+
+        <div class="form-group">
+            <h5>QR Code connection</h5>
+            <p>
+                <span>You can use this QR Code to connect your Zap wallet to your LND instance.<br /></span>
+                <span>This QR Code is only valid for 10 minutes</span>
+            </p>
+        </div>
+        <div class="form-group">
+            @if(Model.QRCode == null)
+            {
+                <form method="post">
+                    <button type="submit" class="btn btn-primary">Show QR Code</button>
+                </form>
+            }
+            else
+            {
+                <div id="qrCode"></div>
+                <div id="qrCodeData" data-url="@Html.Raw(Model.QRCode)"></div>
+
+            }
+        </div>
+
+        <div class="form-group">
+            <h5>More details...</h5>
+            <p>Alternatively, you can see the settings by clicking <a href="#details" data-toggle="collapse">here</a></p>
+        </div>
+        <div id="details" class="collapse">
+            <div class="form-group">
+                <label asp-for="Host"></label>
+                <input asp-for="Host" readonly class="form-control" />
+            </div>
+            <div class="form-group">
+                <label asp-for="Port"></label>
+                <input asp-for="Port" readonly class="form-control" />
+            </div>
+            <div class="form-group">
+                <label asp-for="SSL"></label>
+                <input asp-for="SSL" disabled type="checkbox" class="form-check-inline" />
+            </div>
+            @if(Model.Macaroon != null)
+            {
+                <div class="form-group">
+                    <label asp-for="Macaroon"></label>
+                    <input asp-for="Macaroon" readonly class="form-control" />
+                </div>
+            }
+            @if(Model.CertificateThumbprint != null)
+            {
+                <div class="form-group">
+                    <label asp-for="CertificateThumbprint"></label>
+                    <input asp-for="CertificateThumbprint" readonly class="form-control" />
+                </div>
+            }
+        </div>
+    </div>
+</div>
+
+@section Scripts {
+    @await Html.PartialAsync("_ValidationScriptsPartial")
+
+    @if(Model.QRCode != null)
+    {
+        <script type="text/javascript" src="~/js/qrcode.min.js"></script>
+        <script type="text/javascript">
+        new QRCode(document.getElementById("qrCode"),
+            {
+                text: "@Html.Raw(Model.QRCode)",
+                width: 150,
+                height: 150
+            });
+        </script>
+    }
+}

BTCPayServer/Views/Server/ServerNavPages.cs

@@ -7,6 +7,6 @@ namespace BTCPayServer.Views.Server
 {
     public enum ServerNavPages
     {
-        Index, Users, Rates, Emails, Policies, Theme, Hangfire
+        Index, Users, Rates, Emails, Policies, Theme, Hangfire, Services
     }
 }

BTCPayServer/Views/Server/Services.cshtml

@@ -0,0 +1,53 @@
+@model BTCPayServer.Models.ServerViewModels.ServicesViewModel
+@{
+    ViewData.SetActivePageAndTitle(ServerNavPages.Services);
+}
+
+
+<h4>@ViewData["Title"]</h4>
+<partial name="_StatusMessage" for="@TempData["StatusMessage"]" />
+<div class="row">
+    <div class="col-md-6">
+        <div asp-validation-summary="All" class="text-danger"></div>
+    </div>
+</div>
+
+<div class="row">
+    @if(Model.LNDServices.Count != 0)
+    {
+        <div class="col-md-8">
+            <div class="form-group">
+                <h5>LND nodes</h5>
+                <span>You can get access to internal LND services here. For gRPC, only BTC is supported.</span>
+            </div>
+
+            <div class="form-group">
+                <table class="table table-sm table-responsive-md">
+                    <thead>
+                        <tr>
+                            <th>Crypto</th>
+                            <th>Access Type</th>
+                            <th style="text-align:right">Actions</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        @foreach(var lnd in Model.LNDServices)
+                        {
+                            <tr>
+                                <td>@lnd.Crypto</td>
+                                <td>@lnd.Type</td>
+                                <td style="text-align:right">
+                                    <a asp-action="LNDGRPCServices" asp-route-cryptoCode="@lnd.Crypto">See information</a>
+                                </td>
+                            </tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        </div>
+    }
+</div>
+
+@section Scripts {
+    @await Html.PartialAsync("_ValidationScriptsPartial")
+}

BTCPayServer/Views/Server/_Nav.cshtml

@@ -3,6 +3,7 @@
     <a class="nav-link @ViewData.IsActivePage(ServerNavPages.Rates)" asp-action="Rates">Rates</a>
     <a class="nav-link @ViewData.IsActivePage(ServerNavPages.Emails)" asp-action="Emails">Email server</a>
     <a class="nav-link @ViewData.IsActivePage(ServerNavPages.Policies)" asp-action="Policies">Policies</a>
+    <a class="nav-link @ViewData.IsActivePage(ServerNavPages.Services)" asp-action="Services">Services</a>
     <a class="nav-link @ViewData.IsActivePage(ServerNavPages.Theme)" asp-action="Theme">Theme</a>
     <a class="nav-link @ViewData.IsActivePage(ServerNavPages.Hangfire)" href="~/hangfire" target="_blank">Hangfire</a>
 </div>