minecraft-modpack-updater/ModpackUpdater.Manager/ModpackFeatures.cs

using System.Diagnostics.CodeAnalysis;
using Unleash;
using Unleash.ClientFactory;

namespace ModpackUpdater.Manager;

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);
    }

    public bool IsInvalid()
    {
        return string.IsNullOrWhiteSpace(modpackConfig.UnleashApiUrl) || string.IsNullOrWhiteSpace(modpackConfig.UnleashInstanceId);
    }

    [MemberNotNullWhen(true, nameof(api))]
    private bool InitializeApi()
    {
        if (api != null
            || string.IsNullOrWhiteSpace(modpackConfig.UnleashApiUrl)
            || string.IsNullOrWhiteSpace(modpackConfig.UnleashInstanceId))
            return api != null;
        
        settings = new UnleashSettings
        {
            AppName = "Modpack Updater",
            UnleashApi = new Uri(modpackConfig.UnleashApiUrl),
            FetchTogglesInterval = TimeSpan.FromSeconds(0),
            InstanceTag = modpackConfig.UnleashInstanceId,
        };

        api = new UnleashClientFactory().CreateClient(settings, synchronousInitialization: true);

        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) : AppFeatureContext
{
    public override void Apply(UnleashContext context)
    {
        context.UserId = info.ExtrasKey;
    }
}