Enforce phase for suggestions with joker allowance

Infrastructure/PhaseOrJokerFilter.cs

@@ -0,0 +1,29 @@
+using GameList.Data;
+using GameList.Domain;
+using GameList.Endpoints;
+
+namespace GameList.Infrastructure;
+
+/// <summary>
+/// Allows Suggest phase, or Vote phase when the player has a joker available.
+/// Used for creating suggestions during Vote with joker.
+/// </summary>
+public class PhaseOrJokerFilter : IEndpointFilter
+{
+    public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
+    {
+        var httpContext = context.HttpContext;
+        var db = httpContext.RequestServices.GetRequiredService<AppDbContext>();
+        var player = await EndpointHelpers.GetAuthenticatedPlayer(httpContext, db);
+        if (player is null) return Results.Unauthorized();
+
+        var phase = await EndpointHelpers.GetPhase(db, player.Id);
+        var allow = phase == Phase.Suggest || (phase == Phase.Vote && player.HasJoker);
+        if (!allow)
+        {
+            return EndpointHelpers.PhaseMismatch(Phase.Suggest, phase);
+        }
+
+        return await next(context);
+    }
+}