Feature: Plugin can extend whether an account can login or not

BTCPayServer/NullLocalizers.cs

@@ -0,0 +1,31 @@
+#nullable enable
+using System;
+using System.Collections.Generic;
+using Microsoft.AspNetCore.Mvc.Localization;
+using Microsoft.Extensions.Localization;
+
+namespace BTCPayServer;
+
+public class NullStringLocalizer : IStringLocalizer
+{
+    public static readonly NullStringLocalizer Instance = new();
+    public IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures) => Array.Empty<LocalizedString>();
+
+    public LocalizedString this[string name] => new(name, name);
+
+    public LocalizedString this[string name, params object[] arguments] => new(name, string.Format(name));
+}
+
+public class NullViewLocalizer : IViewLocalizer
+{
+    public static readonly NullViewLocalizer Instance = new();
+    public LocalizedString GetString(string name) => new(name, name);
+
+    public LocalizedString GetString(string name, params object[] arguments) => new(name, string.Format(name));
+
+    public IEnumerable<LocalizedString> GetAllStrings(bool includeParentCultures) => Array.Empty<LocalizedString>();
+
+    public LocalizedHtmlString this[string name]  => new(name, name);
+
+    public LocalizedHtmlString this[string name, params object[] arguments]  => new(name, string.Format(name));
+}