Add settings endpoints and registration status check: implement new API endpoints for settings management, including registration status retrieval, and update the registration command handler to enforce registration rules based on site settings.

backend/src/TeleWave.Api/Endpoints/AuthEndpoints.cs

@@ -9,6 +9,7 @@ using TeleWave.Application.Auth.Logout;
 using TeleWave.Application.Auth.Me;
 using TeleWave.Application.Auth.Refresh;
 using TeleWave.Application.Auth.Register;
+using TeleWave.Application.Settings.GetSiteSettings;
 
 namespace TeleWave.Api.Endpoints;
 
@@ -22,6 +23,7 @@ public static class AuthEndpoints
             .WithTags("Auth")
             .RequireRateLimiting(RateLimiting.AuthPolicy);
 
+        group.MapGet("/registration", RegistrationStatus).Produces<RegistrationStatusDto>();
         group.MapPost("/register", Register).Produces<AuthResponseDto>();
         group.MapPost("/login", Login).Produces<AuthResponseDto>();
         group.MapPost("/refresh", Refresh).Produces<AuthResponseDto>();
@@ -46,6 +48,15 @@ public static class AuthEndpoints
         return app;
     }
 
+    private static async Task<IResult> RegistrationStatus(
+        ISender sender,
+        CancellationToken cancellationToken
+    )
+    {
+        var settings = await sender.Send(new GetSiteSettingsQuery(), cancellationToken);
+        return Results.Ok(new RegistrationStatusDto(settings.RegistrationEnabled));
+    }
+
     private static async Task<IResult> Register(
         RegisterCommand command,
         ISender sender,
@@ -218,3 +229,6 @@ public sealed record AuthResponseDto(
     DateTimeOffset ExpiresAt,
     CurrentUserDto User
 );
+
+/// <summary>Публичный ответ: включена ли открытая регистрация (для страниц входа/регистрации).</summary>
+public sealed record RegistrationStatusDto(bool Enabled);

backend/src/TeleWave.Api/Endpoints/SettingsEndpoints.cs

@@ -0,0 +1,44 @@
+using LiteCqrs;
+using TeleWave.Api.Common;
+using TeleWave.Application.Settings;
+using TeleWave.Application.Settings.GetSiteSettings;
+using TeleWave.Application.Settings.UpdateSiteSettings;
+using TeleWave.Infrastructure.Identity;
+
+namespace TeleWave.Api.Endpoints;
+
+public static class SettingsEndpoints
+{
+    public static IEndpointRouteBuilder MapSettingsEndpoints(this IEndpointRouteBuilder app)
+    {
+        var admin = app.MapGroup("/api/admin/settings")
+            .WithTags("Admin.Settings")
+            .RequireAuthorization(policy => policy.RequireRole(RoleNames.Admin));
+
+        admin.MapGet("", GetSettings).Produces<SiteSettingsDto>();
+        admin.MapPut("", UpdateSettings).Produces(StatusCodes.Status204NoContent);
+
+        return app;
+    }
+
+    private static async Task<IResult> GetSettings(ISender sender, CancellationToken cancellationToken)
+    {
+        var settings = await sender.Send(new GetSiteSettingsQuery(), cancellationToken);
+        return Results.Ok(settings);
+    }
+
+    private static async Task<IResult> UpdateSettings(
+        UpdateSiteSettingsBody body,
+        ISender sender,
+        CancellationToken cancellationToken
+    )
+    {
+        var result = await sender.Send(
+            new UpdateSiteSettingsCommand(body.RegistrationEnabled),
+            cancellationToken
+        );
+        return result.ToHttpResult();
+    }
+}
+
+public sealed record UpdateSiteSettingsBody(bool RegistrationEnabled);

backend/src/TeleWave.Api/Program.cs

@@ -117,6 +117,7 @@ app.MapShowEndpoints();
 app.MapChannelEndpoints();
 app.MapStreamingEndpoints();
 app.MapMaintenanceEndpoints();
+app.MapSettingsEndpoints();
 
 // Раздача статики SPA из wwwroot + fallback на index.html для клиентских маршрутов.
 app.UseDefaultFiles();