Add ability to change domain from server settings

BTCPayServer/BTCPayServer.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.1</TargetFramework>
-		<Version>1.0.2.62</Version>
+		<Version>1.0.2.63</Version>
     <NoWarn>NU1701,CA1816,CA1308,CA1810,CA2208</NoWarn>
   </PropertyGroup>
   <ItemGroup>
@@ -48,6 +48,7 @@
     <PackageReference Include="NicolasDorier.CommandLine.Configuration" Version="1.0.0.3" />
     <PackageReference Include="NicolasDorier.StandardConfiguration" Version="1.0.0.16" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="2.1.0" />
+    <PackageReference Include="SSH.NET" Version="2016.1.0" />
     <PackageReference Include="System.Xml.XmlSerializer" Version="4.3.0" />
     <PackageReference Include="Text.Analyzers" Version="2.6.0" />
   </ItemGroup>
@@ -118,6 +119,9 @@
 	  <Content Update="Views\Server\LNDGRPCServices.cshtml">
 	    <Pack>$(IncludeRazorContentInPack)</Pack>
 	  </Content>
+	  <Content Update="Views\Server\Maintenance.cshtml">
+	    <Pack>$(IncludeRazorContentInPack)</Pack>
+	  </Content>
 	  <Content Update="Views\Server\Services.cshtml">
 	    <Pack>$(IncludeRazorContentInPack)</Pack>
 	  </Content>

BTCPayServer/Controllers/HomeController.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using BTCPayServer.Models;
+using NBitcoin.DataEncoders;
 
 namespace BTCPayServer.Controllers
 {

BTCPayServer/Controllers/ServerController.cs

@@ -22,6 +22,8 @@ using System.Net;
 using System.Net.Http;
 using System.Net.Mail;
 using System.Threading.Tasks;
+using Renci.SshNet;
+using BTCPayServer.Logging;
 
 namespace BTCPayServer.Controllers
 {
@@ -149,6 +151,138 @@ namespace BTCPayServer.Controllers
             return View(userVM);
         }
 
+        [Route("server/maintenance")]
+        public IActionResult Maintenance()
+        {
+            MaintenanceViewModel vm = new MaintenanceViewModel();
+            vm.UserName = "btcpayserver";
+            vm.DNSDomain = this.Request.Host.Host;
+            if (IPAddress.TryParse(vm.DNSDomain, out var unused))
+                vm.DNSDomain = null;
+            return View(vm);
+        }
+        [Route("server/maintenance")]
+        [HttpPost]
+        public async Task<IActionResult> Maintenance(MaintenanceViewModel vm, string command)
+        {
+            if (!ModelState.IsValid)
+                return View(vm);
+            if (command == "changedomain")
+            {
+                if (string.IsNullOrWhiteSpace(vm.DNSDomain))
+                {
+                    ModelState.AddModelError(nameof(vm.DNSDomain), $"Required field");
+                    return View(vm);
+                }
+                vm.DNSDomain = vm.DNSDomain.Trim().ToLowerInvariant();
+                if (IPAddress.TryParse(vm.DNSDomain, out var unused))
+                {
+                    ModelState.AddModelError(nameof(vm.DNSDomain), $"This should be a domain name");
+                    return View(vm);
+                }
+                if (vm.DNSDomain.Equals(this.Request.Host.Host, StringComparison.InvariantCultureIgnoreCase))
+                {
+                    ModelState.AddModelError(nameof(vm.DNSDomain), $"The server is already set to use this domain");
+                    return View(vm);
+                }
+                var builder = new UriBuilder();
+                using (var client = new HttpClient(new HttpClientHandler()
+                {
+                    ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
+                }))
+                {
+                    try
+                    {
+                        builder.Scheme = this.Request.Scheme;
+                        builder.Host = vm.DNSDomain;
+                        if (this.Request.Host.Port != null)
+                            builder.Port = this.Request.Host.Port.Value;
+                        builder.Path = "runid";
+                        builder.Query = $"expected={RunId}";
+                        var response = await client.GetAsync(builder.Uri);
+                        if (!response.IsSuccessStatusCode)
+                        {
+                            ModelState.AddModelError(nameof(vm.DNSDomain), $"Invalid host ({vm.DNSDomain} is not pointing to this BTCPay instance)");
+                            return View(vm);
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        ModelState.AddModelError(nameof(vm.DNSDomain), $"Invalid domain ({ex.Message})");
+                        return View(vm);
+                    }
+                }
+
+                var error = RunSSH(vm, command, $"sudo bash -c '. /etc/profile.d/btcpay-env.sh && . changedomain.sh {vm.DNSDomain}'");
+                if (error != null)
+                    return error;
+
+                builder.Path = null;
+                builder.Query = null;
+                StatusMessage = $"Domain name changing... the server will restart, please use \"{builder.Uri.AbsoluteUri}\"";
+            }
+            else
+            {
+                return NotFound();
+            }
+            return RedirectToAction(nameof(Maintenance));
+        }
+
+        public static string RunId = Encoders.Hex.EncodeData(NBitcoin.RandomUtils.GetBytes(32));
+        [HttpGet]
+        [Route("runid")]
+        [AllowAnonymous]
+        public IActionResult SeeRunId(string expected = null)
+        {
+            if (expected == RunId)
+                return Ok();
+            return BadRequest();
+        }
+
+        private IActionResult RunSSH(MaintenanceViewModel vm, string command, string ssh)
+        {
+            var sshClient = vm.CreateSSHClient(this.Request.Host.Host);
+            try
+            {
+                sshClient.Connect();
+            }
+            catch (Renci.SshNet.Common.SshAuthenticationException)
+            {
+                ModelState.AddModelError(nameof(vm.Password), "Invalid credentials");
+                sshClient.Dispose();
+                return View(vm);
+            }
+            catch (Exception ex)
+            {
+                var message = ex.Message;
+                if (ex is AggregateException aggrEx && aggrEx.InnerException?.Message != null)
+                {
+                    message = aggrEx.InnerException.Message;
+                }
+                ModelState.AddModelError(nameof(vm.UserName), $"Connection problem ({message})");
+                sshClient.Dispose();
+                return View(vm);
+            }
+
+            var sshCommand = sshClient.CreateCommand(ssh);
+            sshCommand.CommandTimeout = TimeSpan.FromMinutes(1.0);
+            sshCommand.BeginExecute(ar =>
+            {
+                try
+                {
+                    Logs.PayServer.LogInformation("Running SSH command: " + command);
+                    var result = sshCommand.EndExecute(ar);
+                    Logs.PayServer.LogInformation("SSH command executed: " + result);
+                }
+                catch (Exception ex)
+                {
+                    Logs.PayServer.LogWarning("Error while executing SSH command: " + ex.Message);
+                }
+                sshClient.Dispose();
+            });
+            return null;
+        }
+
         private static bool IsAdmin(IList<string> roles)
         {
             return roles.Contains(Roles.ServerAdmin, StringComparer.Ordinal);
@@ -336,7 +470,7 @@ namespace BTCPayServer.Controllers
             if (connectionString == null)
                 return null;
             connectionString = connectionString.Clone();
-            if(connectionString.MacaroonFilePath != null)
+            if (connectionString.MacaroonFilePath != null)
             {
                 try
                 {
@@ -351,7 +485,7 @@ namespace BTCPayServer.Controllers
             }
             return connectionString;
         }
-        
+
         [Route("server/theme")]
         public async Task<IActionResult> Theme()
         {

BTCPayServer/Models/ServerViewModels/MaintainanceViewModel.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Threading.Tasks;
+using Renci.SshNet;
+
+namespace BTCPayServer.Models.ServerViewModels
+{
+    public class MaintenanceViewModel
+    {
+        [Required]
+        public string UserName { get; set; }
+        [Required]
+        [DataType(DataType.Password)]
+        public string Password { get; set; }
+        [Display(Name = "Change domain")]
+        public string DNSDomain { get; set; }
+        public SshClient CreateSSHClient(string host)
+        {
+            return new SshClient(host, UserName, Password);
+        }
+    }
+}

BTCPayServer/Views/Server/Maintenance.cshtml

@@ -0,0 +1,52 @@
+@model BTCPayServer.Models.ServerViewModels.MaintenanceViewModel
+@{
+    ViewData.SetActivePageAndTitle(ServerNavPages.Maintainance);
+}
+
+
+<h4>@ViewData["Title"]</h4>
+<partial name="_StatusMessage" for="@TempData["TempDataProperty-StatusMessage"]" />
+
+<div class="row">
+
+    <div class="col-md-8">
+        <form method="post">
+            <div class="form-group">
+                <h5>SSH Settings</h5>
+                <span>You need SSH credentials to run any of those actions</span>
+            </div>
+            <div class="form-group">
+                <label asp-for="UserName"></label>
+                <input asp-for="UserName" class="form-control" />
+                <span asp-validation-for="UserName" class="text-danger"></span>
+            </div>
+
+            <div class="form-group">
+                <label asp-for="Password"></label>
+                <input asp-for="Password" class="form-control" />
+                <span asp-validation-for="Password" class="text-danger"></span>
+            </div>
+
+            <div class="form-group">
+                <h5>Actions</h5>
+                <span>Run any of those administrative functions</span>
+            </div>
+
+            <div class="form-group">
+                <div class="input-group">
+                    <input asp-for="DNSDomain" class="form-control" />
+                    <span class="input-group-btn">
+                        <button type="submit" class="btn btn-primary" name="command" value="changedomain" title="Change domain">
+                            <span class="fa fa-check"></span> Confirm
+                        </button>
+                    </span>
+                </div>
+                <span asp-validation-for="DNSDomain" class="text-danger"></span>
+            </div>
+        </form>
+    </div>
+</div>
+
+@section Scripts {
+    @await Html.PartialAsync("_ValidationScriptsPartial")
+}

BTCPayServer/Views/Server/ServerNavPages.cs

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

BTCPayServer/Views/Server/_Nav.cshtml

@@ -5,6 +5,7 @@
     <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.Maintainance)" asp-action="Maintenance">Maintenance</a>
     <a class="nav-link @ViewData.IsActivePage(ServerNavPages.Hangfire)" href="~/hangfire" target="_blank">Hangfire</a>
 </div>