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/tests/TeleWave.Application.Tests/Auth/RegisterCommandHandlerTests.cs

@@ -13,9 +13,15 @@ public class RegisterCommandHandlerTests
     private readonly IJwtTokenService _jwtTokenService = Substitute.For<IJwtTokenService>();
     private readonly IRefreshTokenService _refreshTokenService =
         Substitute.For<IRefreshTokenService>();
+    private readonly ISiteSettings _siteSettings = Substitute.For<ISiteSettings>();
+
+    public RegisterCommandHandlerTests()
+    {
+        _siteSettings.IsRegistrationEnabledAsync(Arg.Any<CancellationToken>()).Returns(true);
+    }
 
     private RegisterCommandHandler CreateHandler() =>
-        new(_identityService, _jwtTokenService, _refreshTokenService);
+        new(_identityService, _jwtTokenService, _refreshTokenService, _siteSettings);
 
     [Fact]
     public async Task Handle_WithNewUserName_CreatesUserAndReturnsAuthResult()
@@ -41,6 +47,21 @@ public class RegisterCommandHandlerTests
         Assert.Equal("bob", result.Value.User.UserName);
     }
 
+    [Fact]
+    public async Task Handle_WhenRegistrationDisabled_ReturnsForbidden()
+    {
+        _siteSettings.IsRegistrationEnabledAsync(Arg.Any<CancellationToken>()).Returns(false);
+
+        var result = await CreateHandler()
+            .Handle(new RegisterCommand("bob", "password123"), CancellationToken.None);
+
+        Assert.False(result.IsSuccess);
+        Assert.Equal(AuthErrors.RegistrationDisabled, result.Error);
+        await _identityService
+            .DidNotReceive()
+            .CreateUserAsync(Arg.Any<string>(), Arg.Any<string>(), Arg.Any<CancellationToken>());
+    }
+
     [Fact]
     public async Task Handle_WithTakenUserName_ReturnsFailure()
     {