Lightning charge integration

BTCPayServer/BTCPayServer.csproj

@@ -136,6 +136,9 @@
     <Content Update="Views\Home\BitpayTranslator.cshtml">
       <Pack>$(IncludeRazorContentInPack)</Pack>
     </Content>
+    <Content Update="Views\Server\LightningChargeServices.cshtml">
+      <Pack>$(IncludeRazorContentInPack)</Pack>
+    </Content>
     <Content Update="Views\Server\SparkServices.cshtml">
       <Pack>$(IncludeRazorContentInPack)</Pack>
     </Content>

BTCPayServer/Configuration/BTCPayServerOptions.cs

@@ -68,7 +68,7 @@ namespace BTCPayServer.Configuration
         public static LogEventLevel GetDebugLogLevel(IConfiguration configuration)
         {
             var raw = configuration.GetValue("debugloglevel", nameof(LogEventLevel.Debug));
-            return  (LogEventLevel)Enum.Parse(typeof(LogEventLevel), raw, true);
+            return (LogEventLevel)Enum.Parse(typeof(LogEventLevel), raw, true);
         }
 
         public void LoadArgs(IConfiguration conf)
@@ -139,7 +139,7 @@ namespace BTCPayServer.Configuration
                 externalLnd<ExternalLndRest>($"{net.CryptoCode}.external.lnd.rest", "lnd-rest");
 
                 var spark = conf.GetOrDefault<string>($"{net.CryptoCode}.external.spark", string.Empty);
-                if(spark.Length != 0)
+                if (spark.Length != 0)
                 {
                     if (!SparkConnectionString.TryParse(spark, out var connectionString))
                     {
@@ -148,14 +148,30 @@ namespace BTCPayServer.Configuration
                     }
                     ExternalServicesByCryptoCode.Add(net.CryptoCode, new ExternalSpark(connectionString));
                 }
+
+                var charge = conf.GetOrDefault<string>($"{net.CryptoCode}.external.charge", string.Empty);
+                if (charge.Length != 0)
+                {
+                    if (!LightningConnectionString.TryParse(charge, false, out var chargeConnectionString, out var chargeError))
+                        LightningConnectionString.TryParse("type=charge;" + charge, false, out chargeConnectionString, out chargeError);
+
+                    if(chargeConnectionString == null || chargeConnectionString.ConnectionType != LightningConnectionType.Charge)
+                    {
+                        throw new ConfigException($"Invalid setting {net.CryptoCode}.external.charge, " + Environment.NewLine +
+                                $"lightning charge server: 'type=charge;server=https://charge.example.com;api-token=2abdf302...'" + Environment.NewLine +
+                                $"lightning charge server: 'type=charge;server=https://charge.example.com;cookiefilepath=/root/.charge/.cookie'" + Environment.NewLine +
+                                chargeError ?? string.Empty);
+                    }
+                    ExternalServicesByCryptoCode.Add(net.CryptoCode, new ExternalCharge(chargeConnectionString));
+                }
             }
 
             Logs.Configuration.LogInformation("Supported chains: " + String.Join(',', supportedChains.ToArray()));
 
             var services = conf.GetOrDefault<string>("externalservices", null);
-            if(services != null)
+            if (services != null)
             {
-                foreach(var service in services.Split(new[] { ';', ',' })
+                foreach (var service in services.Split(new[] { ';', ',' })
                                                 .Select(p => p.Split(':'))
                                                 .Where(p => p.Length == 2)
                                                 .Select(p => (Name: p[0], Link: p[1])))

BTCPayServer/Configuration/DefaultConfiguration.cs

@@ -50,7 +50,8 @@ namespace BTCPayServer.Configuration
                 app.Option($"--{crypto}explorercookiefile", $"Path to the cookie file (default: {network.NBXplorerNetwork.DefaultSettings.DefaultCookieFile})", CommandOptionType.SingleValue);
                 app.Option($"--{crypto}lightning", $"Easy configuration of lightning for the server administrator: Must be a UNIX socket of c-lightning (lightning-rpc) or URL to a charge server (default: empty)", CommandOptionType.SingleValue);
                 app.Option($"--{crypto}externallndgrpc", $"The LND gRPC configuration BTCPay will expose to easily connect to the internal lnd wallet from Zap wallet (default: empty)", CommandOptionType.SingleValue);
-                app.Option($"--{crypto}externalspark", $"The connection string to spark server (default: empty)", CommandOptionType.SingleValue);
+                app.Option($"--{crypto}externalspark", $"Show spark information in Server settings / Server. The connection string to spark server (default: empty)", CommandOptionType.SingleValue);
+                app.Option($"--{crypto}externalcharge", $"Show lightning charge information in Server settings/Server. The connection string to charge server (default: empty)", CommandOptionType.SingleValue);
             }
             return app;
         }

BTCPayServer/Configuration/External/ExternalCharge.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using BTCPayServer.Lightning;
+
+namespace BTCPayServer.Configuration.External
+{
+    public class ExternalCharge : ExternalService
+    {
+        public ExternalCharge(LightningConnectionString connectionString)
+        {
+            if (connectionString == null)
+                throw new ArgumentNullException(nameof(connectionString));
+            ConnectionString = connectionString;
+        }
+        public LightningConnectionString ConnectionString { get; }
+    }
+}

BTCPayServer/Controllers/ServerController.cs

@@ -449,6 +449,16 @@ namespace BTCPayServer.Controllers
                         Index = i++,
                     });
                 }
+                foreach (var chargeService in _Options.ExternalServicesByCryptoCode.GetServices<ExternalCharge>(cryptoCode))
+                {
+                    result.LNDServices.Add(new ServicesViewModel.LNDServiceViewModel()
+                    {
+                        Crypto = cryptoCode,
+                        Type = "Lightning charge server",
+                        Action = nameof(LightningChargeServices),
+                        Index = i++,
+                    });
+                }
             }
             foreach(var externalService in _Options.ExternalServices)
             {
@@ -469,6 +479,45 @@ namespace BTCPayServer.Controllers
             return View(result);
         }
 
+        [Route("server/services/lightning-charge/{cryptoCode}/{index}")]
+        public async Task<IActionResult> LightningChargeServices(string cryptoCode, int index, bool showQR = false)
+        {
+            if (!_dashBoard.IsFullySynched(cryptoCode, out var unusud))
+            {
+                StatusMessage = $"Error: {cryptoCode} is not fully synched";
+                return RedirectToAction(nameof(Services));
+            }
+            var lightningCharge = _Options.ExternalServicesByCryptoCode.GetServices<ExternalCharge>(cryptoCode).Select(c => c.ConnectionString).FirstOrDefault();
+            if (lightningCharge == null)
+            {
+                return NotFound();
+            }
+
+            ChargeServiceViewModel vm = new ChargeServiceViewModel();
+            vm.Uri = lightningCharge.ToUri(false).AbsoluteUri;
+            vm.APIToken = lightningCharge.Password;
+            try
+            {
+                if (string.IsNullOrEmpty(vm.APIToken) && lightningCharge.CookieFilePath != null)
+                {
+                    if (lightningCharge.CookieFilePath != "fake")
+                        vm.APIToken = await System.IO.File.ReadAllTextAsync(lightningCharge.CookieFilePath);
+                    else
+                        vm.APIToken = "fake";
+                }
+                var builder = new UriBuilder(lightningCharge.ToUri(false));
+                builder.UserName = "api-token";
+                builder.Password = vm.APIToken;
+                vm.AuthenticatedUri = builder.ToString();
+            }
+            catch (Exception ex)
+            {
+                StatusMessage = $"Error: {ex.Message}";
+                return RedirectToAction(nameof(Services));
+            }
+            return View(vm);
+        }
+
         [Route("server/services/spark/{cryptoCode}/{index}")]
         public async Task<IActionResult> SparkServices(string cryptoCode, int index, bool showQR = false)
         {
@@ -477,7 +526,7 @@ namespace BTCPayServer.Controllers
                 StatusMessage = $"Error: {cryptoCode} is not fully synched";
                 return RedirectToAction(nameof(Services));
             }
-            var spark = _Options.ExternalServicesByCryptoCode.GetServices<ExternalSpark>(cryptoCode).Skip(index).Select(c => c.ConnectionString).FirstOrDefault();
+            var spark = _Options.ExternalServicesByCryptoCode.GetServices<ExternalSpark>(cryptoCode).Select(c => c.ConnectionString).FirstOrDefault();
             if(spark == null)
             {
                 return NotFound();

BTCPayServer/Models/ServerViewModels/ChargeServiceViewModel.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace BTCPayServer.Models.ServerViewModels
+{
+    public class ChargeServiceViewModel
+    {
+        public string Uri { get; set; }
+        public string APIToken { get; set; }
+        public string AuthenticatedUri { get; set; }
+    }
+}

BTCPayServer/Properties/launchSettings.json

@@ -30,6 +30,7 @@
                 "BTCPAY_BTCEXTERNALLNDGRPC": "type=lnd-grpc;server=https://lnd:lnd@127.0.0.1:53280/;allowinsecure=true",
                 "BTCPAY_BTCEXTERNALLNDREST": "type=lnd-rest;server=https://lnd:lnd@127.0.0.1:53280/lnd-rest/btc/;allowinsecure=true",
                 "BTCPAY_BTCEXTERNALSPARK": "server=https://127.0.0.1:53280/spark/btc/;cookiefile=fake",
+                "BTCPAY_BTCEXTERNALCHARGE": "server=https://127.0.0.1:53280/spark/btc/;cookiefilepath=fake",
                 "BTCPAY_BTCEXPLORERURL": "http://127.0.0.1:32838/",
                 "ASPNETCORE_ENVIRONMENT": "Development",
                 "BTCPAY_CHAINS": "btc,ltc",

BTCPayServer/Views/Server/LightningChargeServices.cshtml

@@ -0,0 +1,60 @@
+@model ChargeServiceViewModel
+@{
+    ViewData.SetActivePageAndTitle(ServerNavPages.Services);
+}
+
+
+<h4>Lightning charge service</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>Lightning charge is a simple API for invoicing on lightning network, you can use it with several plugins:</span>
+                <ul>
+                    <li><a href="https://github.com/ElementsProject/woocommerce-gateway-lightning" target="_blank">WooCommerce Lightning Gateway</a>: A comprehensive e-commerce application that integrates with stock-management and order-tracking systems</li>
+                    <li><a href="https://github.com/ElementsProject/nanopos" target="_blank">Nanopos</a>: A simple point-of-sale system for fixed-price goods</li>
+                    <li><a href="https://github.com/ElementsProject/filebazaar" target="_blank">FileBazaar</a>: A system for selling files such as documents, images, and videos</li>
+                    <li><a href="https://github.com/ElementsProject/wordpress-lightning-publisher" target="_blank">Lightning Publisher for WordPress</a>: A patronage model for unlocking WordPress blog entries</li>
+                    <li><a href="https://github.com/ElementsProject/paypercall" target="_blank">Paypercall</a>: A programmer’s toolkit for Lightning that enables micropayments for individual API calls</li>
+                    <li><a href="https://github.com/ElementsProject/ifpaytt" target="_blank">Ifpaytt</a>: An extension of paypercall that allows web developers using IFTTT to request payments for service usage</li>
+                    <li><a href="https://github.com/ElementsProject/lightning-jukebox" target="_blank">Lightning Jukebox</a>: A fun demo that reimagines a classic technology for the Lightning Network</li>
+                    <li><a href="https://github.com/ElementsProject/nanotip" target="_blank">Nanotip</a>: The simple tip jar, rebuilt to issue Lightning Network invoices</li>
+                </ul>
+            </p>
+        </div>
+    </div>
+</div>
+<div class="row">
+    <div class="col-md-8">
+        <h4>Credentials</h4>
+        @if (Model.Uri != null)
+        {
+            <div class="form-group">
+                <label asp-for="Uri"></label>
+                <input asp-for="Uri" readonly class="form-control" />
+            </div>
+        }
+        @if (Model.APIToken != null)
+        {
+            <div class="form-group">
+                <label asp-for="APIToken"></label>
+                <input asp-for="APIToken" readonly class="form-control" />
+            </div>
+        }
+        @if (Model.AuthenticatedUri != null)
+        {
+            <div class="form-group">
+                <label asp-for="AuthenticatedUri"></label>
+                <input asp-for="AuthenticatedUri" readonly class="form-control" />
+            </div>
+        }
+    </div>
+</div>