Add phase requirement filter for vote/results endpoints

Infrastructure/PhaseRequirementFilter.cs

@@ -0,0 +1,31 @@
+using GameList.Data;
+using GameList.Domain;
+using GameList.Endpoints;
+
+namespace GameList.Infrastructure;
+
+public class PhaseRequirementFilter : IEndpointFilter
+{
+    private readonly Phase _required;
+
+    public PhaseRequirementFilter(Phase required)
+    {
+        _required = required;
+    }
+
+    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);
+        if (phase != _required)
+        {
+            return EndpointHelpers.PhaseMismatch(_required, phase);
+        }
+
+        return await next(context);
+    }
+}