Removing LND seed information from walletunlock.json

BTCPayServer/Controllers/ServerController.cs

@@ -666,6 +666,38 @@ namespace BTCPayServer.Controllers
             }
         }
 
+        [HttpPost]
+        [Route("server/services/{serviceName}/{cryptoCode}/removelndseed")]
+        public async Task<IActionResult> RemoveLndSeed(string serviceName, string cryptoCode)
+        {
+            var service = GetService(serviceName, cryptoCode);
+            if (service == null)
+                return NotFound();
+
+            var model = LndSeedBackupViewModel.Parse(service.ConnectionString.CookieFilePath);
+            if (!model.IsWalletUnlockPresent)
+            {
+                TempData[WellKnownTempData.ErrorMessage] = $"File with wallet password and seed info not present";
+                return RedirectToAction(nameof(Services));
+            }
+
+            if (model.Seed == null || model.Seed.Count <= 1)
+            {
+                TempData[WellKnownTempData.ErrorMessage] = $"Seed information was already removed";
+                return RedirectToAction(nameof(Services));
+            }
+
+            if (await model.RemoveSeedAndWrite(service.ConnectionString.CookieFilePath))
+            {
+                return RedirectToAction(nameof(Service), new { serviceName, cryptoCode });
+            }
+            else
+            {
+                TempData[WellKnownTempData.ErrorMessage] = $"Seed removal failed";
+                return RedirectToAction(nameof(Services));
+            }
+        }
+
         private IActionResult LightningChargeServices(ExternalService service, ExternalConnectionString connectionString, bool showQR = false)
         {
             ChargeServiceViewModel vm = new ChargeServiceViewModel();

BTCPayServer/Models/ServerViewModels/LndSeedBackupViewModel.cs

@@ -1,7 +1,9 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
+using System.Globalization;
 using System.IO;
+using System.Threading.Tasks;
 using Newtonsoft.Json;
 
 namespace BTCPayServer.Models.ServerViewModels
@@ -14,6 +16,29 @@ namespace BTCPayServer.Models.ServerViewModels
 
         public List<string> Seed { get; set; }
 
+
+        public async Task<bool> RemoveSeedAndWrite(string lndSeedFilePath)
+        {
+            var removedDate = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ssZ", CultureInfo.InvariantCulture);
+            var seedFile = new LndSeedFile
+            {
+                wallet_password = WalletPassword,
+                cipher_seed_mnemonic = new List<string> { $"Seed removed on {removedDate}" }
+            };
+            var json = JsonConvert.SerializeObject(seedFile);
+            try
+            {
+                await File.WriteAllTextAsync(lndSeedFilePath, json);
+                return true;
+            }
+            catch
+            {
+                // file access exception and such
+                return false;
+            }
+        }
+
+
         public static LndSeedBackupViewModel Parse(string lndSeedFilePath)
         {
             try

BTCPayServer/Views/Server/LndSeedBackup.cshtml

@@ -24,13 +24,20 @@
                     <p>
                         <div><a href="#details" data-toggle="collapse">Reveal Seed Information</a></div>
                         <div id="details" class="collapse">
-                            @String.Join(", ", Model.Seed)
+                            @foreach (var item in Model.Seed)
+                            {
+                                <span>@item</span>
+                            }
+                            <br /><br />
+                            <form method="post" action="@Context.Request.Path/removelndseed">
+                                <button class="btn btn-primary" type="submit" onclick="return confirmSeedDelete();">Remove Seed from server</button>
+                            </form>
                         </div>
                     </p>
                 }
                 else
                 {
-                    <p>Seed information was deleted on <b>@Model.Seed.First()</b></p>
+                    <p><b>@Model.Seed.First()</b></p>
                 }
             }
             else