app/BTCPayApp.UI/App.razor

@using BTCPayApp.Core.Auth
@using BTCPayApp.UI.Features
@using BTCPayApp.UI.Pages
@using BTCPayApp.Core.Contracts
@using BTCPayApp.UI.Pages.SignedOut
@inherits Fluxor.Blazor.Web.Components.FluxorComponent
@inject IDispatcher Dispatcher
@inject IAccountManager AccountManager
@inject ConfigProvider ConfigProvider

<PageTitle>BTCPay Server</PageTitle>
<Fluxor.Blazor.Web.StoreInitializer  />
<CascadingAuthenticationState>
    <AuthorizeView>
        <Authorized>
            @RouterWithLayout(typeof(MainLayout))
        </Authorized>
        <Authorizing>
            @RouterWithLayout(typeof(BaseLayout))
        </Authorizing>
        <NotAuthorized>
            @RouterWithLayout(typeof(SimpleLayout))
        </NotAuthorized>
    </AuthorizeView>
</CascadingAuthenticationState>

@code {
    [CascadingParameter]
    private Task<AuthenticationState>? AuthState { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await base.OnInitializedAsync();

        var state = await ConfigProvider.Get<UIState>(StateMiddleware.UiStateConfigKey);
        if (!string.IsNullOrEmpty(state?.SelectedTheme))
        {
            Dispatcher.Dispatch(new UIState.ApplyUserTheme(state.SelectedTheme));
        }

        // signed in
        if (AuthState == null) return;
        var authState = await AuthState;
        var account = AccountManager.Account;
        if (authState.User.Identity?.IsAuthenticated is true && !string.IsNullOrEmpty(account?.BaseUri))
        {
            Dispatcher.Dispatch(new UIState.FetchInstanceInfo(account.BaseUri));
        }

        // store
        var store = AccountManager.CurrentStore;
        if (store != null)
        {
            Dispatcher.Dispatch(new StoreState.SetStoreInfo(store));
        }
    }

    RenderFragment RouterWithLayout(Type layoutType) => __builder =>
    {
        <Router AppAssembly="@typeof(App).Assembly">
            <Found Context="routeData">
                <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@layoutType">
                    <NotAuthorized>
                        <RedirectToIndex/>
                    </NotAuthorized>
                    <Authorizing>
                        <IndexPage />
                    </Authorizing>
                </AuthorizeRouteView>
                <FocusOnNavigate RouteData="@routeData" Selector="h1"/>
            </Found>
            <NotFound>
                <PageTitle>Not found</PageTitle>
                <LayoutView Layout="@typeof(SimpleLayout)">
                    <ErrorPage Title="Not found" Message="This page does not exist."/>
                </LayoutView>
            </NotFound>
        </Router>
    };
}