New: Option to treat downloads with non-media extensions as failed

Closes #7369

src/NzbDrone.Core/Indexers/CachedIndexerSettingsProvider.cs

@@ -0,0 +1,69 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using NzbDrone.Common.Cache;
+using NzbDrone.Core.Messaging.Events;
+using NzbDrone.Core.ThingiProvider.Events;
+
+namespace NzbDrone.Core.Indexers;
+
+public interface ICachedIndexerSettingsProvider
+{
+    CachedIndexerSettings GetSettings(int indexerId);
+}
+
+public class CachedIndexerSettingsProvider : ICachedIndexerSettingsProvider, IHandle<ProviderUpdatedEvent<IIndexer>>
+{
+    private readonly IIndexerFactory _indexerFactory;
+    private readonly ICached<CachedIndexerSettings> _cache;
+
+    public CachedIndexerSettingsProvider(IIndexerFactory indexerFactory, ICacheManager cacheManager)
+    {
+        _indexerFactory = indexerFactory;
+        _cache = cacheManager.GetRollingCache<CachedIndexerSettings>(GetType(), "settingsByIndexer", TimeSpan.FromHours(1));
+    }
+
+    public CachedIndexerSettings GetSettings(int indexerId)
+    {
+        if (indexerId == 0)
+        {
+            return null;
+        }
+
+        return _cache.Get(indexerId.ToString(), () => FetchIndexerSettings(indexerId));
+    }
+
+    private CachedIndexerSettings FetchIndexerSettings(int indexerId)
+    {
+        var indexer = _indexerFactory.Get(indexerId);
+        var indexerSettings = indexer.Settings as IIndexerSettings;
+
+        if (indexerSettings == null)
+        {
+            return null;
+        }
+
+        var settings = new CachedIndexerSettings
+        {
+            FailDownloads = indexerSettings.FailDownloads.Select(f => (FailDownloads)f).ToHashSet()
+        };
+
+        if (indexer.Settings is ITorrentIndexerSettings torrentIndexerSettings)
+        {
+            settings.SeedCriteriaSettings = torrentIndexerSettings.SeedCriteria;
+        }
+
+        return settings;
+    }
+
+    public void Handle(ProviderUpdatedEvent<IIndexer> message)
+    {
+        _cache.Clear();
+    }
+}
+
+public class CachedIndexerSettings
+{
+    public HashSet<FailDownloads> FailDownloads { get; set; }
+    public SeedCriteriaSettings SeedCriteriaSettings { get; set; }
+}