Added authenication/authorization. Refactored api startup.

JSMR.UI.Blazor/Components/Authentication/RequireAuthentication.razor

@@ -0,0 +1,35 @@
+@using JSMR.UI.Blazor.Services
+
+@inject SessionState Session
+@inject NavigationManager Nav
+
+@if (!ready)
+{
+    <p>Loading...</p>
+}
+else if (!Session.IsAuthenticated)
+{
+    <!-- nothing shown, we redirect -->
+}
+else
+{
+    @ChildContent
+}
+
+@code {
+    [Parameter] public RenderFragment? ChildContent { get; set; }
+
+    private bool ready;
+
+    protected override async Task OnInitializedAsync()
+    {
+        await Session.RefreshAsync();
+        ready = true;
+
+        if (!Session.IsAuthenticated)
+        {
+            var returnUrl = Uri.EscapeDataString(Nav.Uri);
+            Nav.NavigateTo($"/login?returnUrl={returnUrl}", forceLoad: false);
+        }
+    }
+}