unleash api via modpack config

ModpackUpdater.Manager/ModpackFeatures.cs

@@ -0,0 +1,73 @@
+using ModpackUpdater.Model;
+using Unleash;
+
+namespace ModpackUpdater;
+
+public class ModpackFeatures(ModpackConfig modpackConfig)
+{
+    private IUnleash api;
+    private UnleashContext context;
+    private UnleashSettings settings;
+
+    public static string FeatureAllowExtas => "allow-extras";
+
+    ~ModpackFeatures()
+    {
+        api?.Dispose();
+    }
+
+    public bool IsEnabled(string feature)
+    {
+        return IsEnabled(feature, null);
+    }
+
+    public bool IsEnabled(string feature, AppFeatureContext context)
+    {
+        return CheckFeature(feature, context);
+    }
+
+    private bool InitializeApi()
+    {
+        if (api == null)
+        {
+            settings = new UnleashSettings
+            {
+                AppName = "Modpack Updater",
+                UnleashApi = new Uri(modpackConfig.UnleashApiUrl),
+                FetchTogglesInterval = TimeSpan.FromSeconds(60 * 5),
+                InstanceTag = modpackConfig.UnleashInstanceId,
+            };
+
+            api = new DefaultUnleash(settings);
+        }
+
+        return api != null;
+    }
+
+    private bool CheckFeature(string name, AppFeatureContext context)
+    {
+        return InitializeApi() && api.IsEnabled(name, GetContext(context));
+    }
+
+    private UnleashContext GetContext(AppFeatureContext ccontext)
+    {
+        context ??= new();
+        context.CurrentTime = DateTime.Now;
+        ccontext?.Apply(context);
+        return context;
+    }
+}
+
+public abstract class AppFeatureContext
+{
+    public abstract void Apply(UnleashContext context);
+}
+
+public class AllowExtrasFeatureContext(ModpackInfo info, ModpackConfig config) : AppFeatureContext
+{
+    public override void Apply(UnleashContext context)
+    {
+        context.UserId = info.ExtrasKey;
+        context.Environment = config.Key;
+    }
+}