AutoLoad DLC/updates (#12)

* Add hooks to ApplicationLibrary for loading DLC/updates

* Trigger DLC/update load on games refresh

* Initial moving of DLC/updates to UI.Common

* Use new models in ApplicationLibrary

* Make dlc/updates records; use ApplicationLibrary for loading logic

* Fix a bug with DLC window; rework some logic

* Auto-load bundled DLC on startup

* Autoload DLC

* Add setting for autoloading dlc/updates

* Remove dead code; bind to AppLibrary apps directly in mainwindow

* Stub out bulk dlc menu item

* Add localization; stub out bulk load updates

* Set autoload dirs explicitly

* Begin extracting updates to match DLC refactors

* Add title update autoloading

* Reduce size of settings sections

* Better cache lookup for apps

* Dont reload entire library on game version change

* Remove ApplicationAdded event; always enumerate nsp when autoloading

src/Ryujinx.UI.Common/App/ApplicationAddedEventArgs.cs

@@ -1,9 +0,0 @@
-using System;
-
-namespace Ryujinx.UI.App.Common
-{
-    public class ApplicationAddedEventArgs : EventArgs
-    {
-        public ApplicationData AppData { get; set; }
-    }
-}

src/Ryujinx.UI.Common/App/ApplicationLibrary.cs

@@ -1,6 +1,7 @@
+using DynamicData;
+using DynamicData.Kernel;
 using LibHac;
 using LibHac.Common;
-using LibHac.Common.Keys;
 using LibHac.Fs;
 using LibHac.Fs.Fsa;
 using LibHac.FsSystem;
@@ -16,8 +17,11 @@ using Ryujinx.HLE.FileSystem;
 using Ryujinx.HLE.HOS.SystemState;
 using Ryujinx.HLE.Loaders.Npdm;
 using Ryujinx.HLE.Loaders.Processes.Extensions;
+using Ryujinx.HLE.Utilities;
 using Ryujinx.UI.Common.Configuration;
 using Ryujinx.UI.Common.Configuration.System;
+using Ryujinx.UI.Common.Helper;
+using Ryujinx.UI.Common.Models;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -27,7 +31,9 @@ using System.Text;
 using System.Text.Json;
 using System.Threading;
 using ContentType = LibHac.Ncm.ContentType;
+using MissingKeyException = LibHac.Common.Keys.MissingKeyException;
 using Path = System.IO.Path;
+using SpanHelpers = LibHac.Common.SpanHelpers;
 using TimeSpan = System.TimeSpan;
 
 namespace Ryujinx.UI.App.Common
@@ -35,9 +41,12 @@ namespace Ryujinx.UI.App.Common
     public class ApplicationLibrary
     {
         public Language DesiredLanguage { get; set; }
-        public event EventHandler<ApplicationAddedEventArgs> ApplicationAdded;
         public event EventHandler<ApplicationCountUpdatedEventArgs> ApplicationCountUpdated;
 
+        public readonly IObservableCache<ApplicationData, ulong> Applications;
+        public readonly IObservableCache<(TitleUpdateModel TitleUpdate, bool IsSelected), TitleUpdateModel> TitleUpdates;
+        public readonly IObservableCache<(DownloadableContentModel Dlc, bool IsEnabled), DownloadableContentModel> DownloadableContents;
+
         private readonly byte[] _nspIcon;
         private readonly byte[] _xciIcon;
         private readonly byte[] _ncaIcon;
@@ -47,6 +56,9 @@ namespace Ryujinx.UI.App.Common
         private readonly VirtualFileSystem _virtualFileSystem;
         private readonly IntegrityCheckLevel _checkLevel;
         private CancellationTokenSource _cancellationToken;
+        private readonly SourceCache<ApplicationData, ulong> _applications = new(it => it.Id);
+        private readonly SourceCache<(TitleUpdateModel TitleUpdate, bool IsSelected), TitleUpdateModel> _titleUpdates = new(it => it.TitleUpdate);
+        private readonly SourceCache<(DownloadableContentModel Dlc, bool IsEnabled), DownloadableContentModel> _downloadableContents = new(it => it.Dlc);
 
         private static readonly ApplicationJsonSerializerContext _serializerContext = new(JsonHelper.GetDefaultSerializerOptions());
 
@@ -55,6 +67,10 @@ namespace Ryujinx.UI.App.Common
             _virtualFileSystem = virtualFileSystem;
             _checkLevel = checkLevel;
 
+            Applications = _applications.AsObservableCache();
+            TitleUpdates = _titleUpdates.AsObservableCache();
+            DownloadableContents = _downloadableContents.AsObservableCache();
+
             _nspIcon = GetResourceBytes("Ryujinx.UI.Common.Resources.Icon_NSP.png");
             _xciIcon = GetResourceBytes("Ryujinx.UI.Common.Resources.Icon_XCI.png");
             _ncaIcon = GetResourceBytes("Ryujinx.UI.Common.Resources.Icon_NCA.png");
@@ -100,7 +116,7 @@ namespace Ryujinx.UI.App.Common
             return data;
         }
 
-        /// <exception cref="MissingKeyException">The configured key set is missing a key.</exception>
+        /// <exception cref="LibHac.Common.Keys.MissingKeyException">The configured key set is missing a key.</exception>
         /// <exception cref="InvalidDataException">The NCA header could not be decrypted.</exception>
         /// <exception cref="NotSupportedException">The NCA version is not supported.</exception>
         /// <exception cref="HorizonResultException">An error occured while reading PFS data.</exception>
@@ -176,7 +192,7 @@ namespace Ryujinx.UI.App.Common
             return null;
         }
 
-        /// <exception cref="MissingKeyException">The configured key set is missing a key.</exception>
+        /// <exception cref="LibHac.Common.Keys.MissingKeyException">The configured key set is missing a key.</exception>
         /// <exception cref="InvalidDataException">The NCA header could not be decrypted.</exception>
         /// <exception cref="NotSupportedException">The NCA version is not supported.</exception>
         /// <exception cref="HorizonResultException">An error occured while reading PFS data.</exception>
@@ -474,6 +490,148 @@ namespace Ryujinx.UI.App.Common
             return true;
         }
 
+        public bool TryGetDownloadableContentFromFile(string filePath, out List<DownloadableContentModel> titleUpdates)
+        {
+            titleUpdates = [];
+
+            try
+            {
+                string extension = Path.GetExtension(filePath).ToLower();
+
+                using FileStream file = new(filePath, FileMode.Open, FileAccess.Read);
+
+                switch (extension)
+                {
+                    case ".xci":
+                    case ".nsp":
+                        {
+                            IntegrityCheckLevel checkLevel = ConfigurationState.Instance.System.EnableFsIntegrityChecks
+                                ? IntegrityCheckLevel.ErrorOnInvalid
+                                : IntegrityCheckLevel.None;
+
+                            using IFileSystem pfs = PartitionFileSystemUtils.OpenApplicationFileSystem(filePath, _virtualFileSystem);
+
+                            foreach (DirectoryEntryEx fileEntry in pfs.EnumerateEntries("/", "*.nca"))
+                            {
+                                using var ncaFile = new UniqueRef<IFile>();
+
+                                pfs.OpenFile(ref ncaFile.Ref, fileEntry.FullPath.ToU8Span(), OpenMode.Read).ThrowIfFailure();
+
+                                Nca nca = TryOpenNca(ncaFile.Get.AsStorage());
+                                if (nca == null)
+                                {
+                                    continue;
+                                }
+
+                                if (nca.Header.ContentType == NcaContentType.PublicData)
+                                {
+                                    titleUpdates.Add(new DownloadableContentModel(nca.Header.TitleId, filePath, fileEntry.FullPath));
+                                }
+                            }
+
+                            return titleUpdates.Count != 0;
+                        }
+                }
+            }
+            catch (MissingKeyException exception)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"Your key set is missing a key with the name: {exception.Name}");
+            }
+            catch (InvalidDataException)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"The header key is incorrect or missing and therefore the NCA header content type check has failed. Errored File: {filePath}");
+            }
+            catch (IOException exception)
+            {
+                Logger.Warning?.Print(LogClass.Application, exception.Message);
+            }
+            catch (Exception exception)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"The file encountered was not of a valid type. File: '{filePath}' Error: {exception}");
+            }
+
+            return false;
+        }
+
+        public bool TryGetTitleUpdatesFromFile(string filePath, out List<TitleUpdateModel> titleUpdates)
+        {
+            titleUpdates = [];
+
+            try
+            {
+                string extension = Path.GetExtension(filePath).ToLower();
+
+                using FileStream file = new(filePath, FileMode.Open, FileAccess.Read);
+
+                switch (extension)
+                {
+                    case ".xci":
+                    case ".nsp":
+                        {
+                            IntegrityCheckLevel checkLevel = ConfigurationState.Instance.System.EnableFsIntegrityChecks
+                                ? IntegrityCheckLevel.ErrorOnInvalid
+                                : IntegrityCheckLevel.None;
+
+                            using IFileSystem pfs =
+                                PartitionFileSystemUtils.OpenApplicationFileSystem(filePath, _virtualFileSystem);
+
+                            Dictionary<ulong, ContentMetaData> updates =
+                                pfs.GetContentData(ContentMetaType.Patch, _virtualFileSystem, checkLevel);
+
+                            if (updates.Count == 0)
+                            {
+                                return false;
+                            }
+
+                            foreach ((_, ContentMetaData content) in updates)
+                            {
+                                Nca patchNca = content.GetNcaByType(_virtualFileSystem.KeySet, ContentType.Program);
+                                Nca controlNca = content.GetNcaByType(_virtualFileSystem.KeySet, ContentType.Control);
+
+                                if (controlNca != null && patchNca != null)
+                                {
+                                    ApplicationControlProperty controlData = new();
+
+                                    using UniqueRef<IFile> nacpFile = new();
+
+                                    controlNca.OpenFileSystem(NcaSectionType.Data, IntegrityCheckLevel.None)
+                                        .OpenFile(ref nacpFile.Ref, "/control.nacp".ToU8Span(), OpenMode.Read)
+                                        .ThrowIfFailure();
+                                    nacpFile.Get.Read(out _, 0, SpanHelpers.AsByteSpan(ref controlData),
+                                        ReadOption.None).ThrowIfFailure();
+
+                                    var displayVersion = controlData.DisplayVersionString.ToString();
+                                    var update = new TitleUpdateModel(content.ApplicationId, content.Version.Version,
+                                        displayVersion, filePath);
+
+                                    titleUpdates.Add(update);
+                                }
+                            }
+
+                            return true;
+                        }
+                }
+            }
+            catch (MissingKeyException exception)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"Your key set is missing a key with the name: {exception.Name}");
+            }
+            catch (InvalidDataException)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"The header key is incorrect or missing and therefore the NCA header content type check has failed. Errored File: {filePath}");
+            }
+            catch (IOException exception)
+            {
+                Logger.Warning?.Print(LogClass.Application, exception.Message);
+            }
+            catch (Exception exception)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"The file encountered was not of a valid type. File: '{filePath}' Error: {exception}");
+            }
+
+            return false;
+        }
+
         public void CancelLoading()
         {
             _cancellationToken?.Cancel();
@@ -493,6 +651,7 @@ namespace Ryujinx.UI.App.Common
             int numApplicationsLoaded = 0;
 
             _cancellationToken = new CancellationTokenSource();
+            _applications.Clear();
 
             // Builds the applications list with paths to found applications
             List<string> applicationPaths = new();
@@ -524,12 +683,12 @@ namespace Ryujinx.UI.App.Common
                         IEnumerable<string> files = Directory.EnumerateFiles(appDir, "*", options).Where(file =>
                         {
                             return
-                            (Path.GetExtension(file).ToLower() is ".nsp" && ConfigurationState.Instance.UI.ShownFileTypes.NSP.Value) ||
-                            (Path.GetExtension(file).ToLower() is ".pfs0" && ConfigurationState.Instance.UI.ShownFileTypes.PFS0.Value) ||
-                            (Path.GetExtension(file).ToLower() is ".xci" && ConfigurationState.Instance.UI.ShownFileTypes.XCI.Value) ||
-                            (Path.GetExtension(file).ToLower() is ".nca" && ConfigurationState.Instance.UI.ShownFileTypes.NCA.Value) ||
-                            (Path.GetExtension(file).ToLower() is ".nro" && ConfigurationState.Instance.UI.ShownFileTypes.NRO.Value) ||
-                            (Path.GetExtension(file).ToLower() is ".nso" && ConfigurationState.Instance.UI.ShownFileTypes.NSO.Value);
+                                (Path.GetExtension(file).ToLower() is ".nsp" && ConfigurationState.Instance.UI.ShownFileTypes.NSP.Value) ||
+                                (Path.GetExtension(file).ToLower() is ".pfs0" && ConfigurationState.Instance.UI.ShownFileTypes.PFS0.Value) ||
+                                (Path.GetExtension(file).ToLower() is ".xci" && ConfigurationState.Instance.UI.ShownFileTypes.XCI.Value) ||
+                                (Path.GetExtension(file).ToLower() is ".nca" && ConfigurationState.Instance.UI.ShownFileTypes.NCA.Value) ||
+                                (Path.GetExtension(file).ToLower() is ".nro" && ConfigurationState.Instance.UI.ShownFileTypes.NRO.Value) ||
+                                (Path.GetExtension(file).ToLower() is ".nso" && ConfigurationState.Instance.UI.ShownFileTypes.NSO.Value);
                         });
 
                         foreach (string app in files)
@@ -570,13 +729,19 @@ namespace Ryujinx.UI.App.Common
 
                     if (TryGetApplicationsFromFile(applicationPath, out List<ApplicationData> applications))
                     {
-                        foreach (var application in applications)
+                        _applications.Edit(it =>
                         {
-                            OnApplicationAdded(new ApplicationAddedEventArgs
+                            foreach (var application in applications)
                             {
-                                AppData = application,
-                            });
-                        }
+                                it.AddOrUpdate(application);
+                                LoadDlcForApplication(application);
+                                if (LoadTitleUpdatesForApplication(application))
+                                {
+                                    // Trigger a reload of the version data
+                                    RefreshApplicationInfo(application.IdBase);
+                                }
+                            }
+                        });
 
                         if (applications.Count > 1)
                         {
@@ -610,9 +775,236 @@ namespace Ryujinx.UI.App.Common
             }
         }
 
-        protected void OnApplicationAdded(ApplicationAddedEventArgs e)
+        // Replace the currently stored DLC state for the game with the provided DLC state.
+        public void SaveDownloadableContentsForGame(ApplicationData application, List<(DownloadableContentModel, bool IsEnabled)> dlcs)
         {
-            ApplicationAdded?.Invoke(null, e);
+            _downloadableContents.Edit(it =>
+            {
+                DownloadableContentsHelper.SaveDownloadableContentsJson(_virtualFileSystem, application.IdBase, dlcs);
+
+                it.Remove(it.Items.Where(item => item.Dlc.TitleIdBase == application.IdBase));
+                it.AddOrUpdate(dlcs);
+            });
+        }
+
+        // Replace the currently stored update state for the game with the provided update state.
+        public void SaveTitleUpdatesForGame(ApplicationData application, List<(TitleUpdateModel, bool IsSelected)> updates)
+        {
+            _titleUpdates.Edit(it =>
+            {
+                TitleUpdatesHelper.SaveTitleUpdatesJson(_virtualFileSystem, application.IdBase, updates);
+
+                it.Remove(it.Items.Where(item => item.TitleUpdate.TitleIdBase == application.IdBase));
+                it.AddOrUpdate(updates);
+                RefreshApplicationInfo(application.IdBase);
+            });
+        }
+
+        // Searches the provided directories for DLC NSP files that are _valid for the currently detected games in the
+        // library_, and then enables those DLC.
+        public int AutoLoadDownloadableContents(List<string> appDirs)
+        {
+            _cancellationToken = new CancellationTokenSource();
+
+            List<string> dlcPaths = new();
+            int newDlcLoaded = 0;
+
+            try
+            {
+                foreach (string appDir in appDirs)
+                {
+                    if (_cancellationToken.Token.IsCancellationRequested)
+                    {
+                        return newDlcLoaded;
+                    }
+
+                    if (!Directory.Exists(appDir))
+                    {
+                        Logger.Warning?.Print(LogClass.Application,
+                            $"The specified autoload directory \"{appDir}\" does not exist.");
+
+                        continue;
+                    }
+
+                    try
+                    {
+                        EnumerationOptions options = new()
+                        {
+                            RecurseSubdirectories = true,
+                            IgnoreInaccessible = false,
+                        };
+
+                        IEnumerable<string> files = Directory.EnumerateFiles(appDir, "*", options).Where(
+                            file => Path.GetExtension(file).ToLower() is ".nsp");
+
+                        foreach (string app in files)
+                        {
+                            if (_cancellationToken.Token.IsCancellationRequested)
+                            {
+                                return newDlcLoaded;
+                            }
+
+                            var fileInfo = new FileInfo(app);
+
+                            try
+                            {
+                                var fullPath = fileInfo.ResolveLinkTarget(true)?.FullName ?? fileInfo.FullName;
+
+                                dlcPaths.Add(fullPath);
+                            }
+                            catch (IOException exception)
+                            {
+                                Logger.Warning?.Print(LogClass.Application,
+                                    $"Failed to resolve the full path to file: \"{app}\" Error: {exception}");
+                            }
+                        }
+                    }
+                    catch (UnauthorizedAccessException)
+                    {
+                        Logger.Warning?.Print(LogClass.Application,
+                            $"Failed to get access to directory: \"{appDir}\"");
+                    }
+                }
+
+                var appIdLookup = Applications.Items.Select(it => it.IdBase).ToHashSet();
+
+                foreach (string dlcPath in dlcPaths)
+                {
+                    if (_cancellationToken.Token.IsCancellationRequested)
+                    {
+                        return newDlcLoaded;
+                    }
+
+                    if (TryGetDownloadableContentFromFile(dlcPath, out var foundDlcs))
+                    {
+                        foreach (var dlc in foundDlcs.Where(it => appIdLookup.Contains(it.TitleIdBase)))
+                        {
+                            if (!_downloadableContents.Lookup(dlc).HasValue)
+                            {
+                                _downloadableContents.AddOrUpdate((dlc, true));
+                                SaveDownloadableContentsForGame(dlc.TitleIdBase);
+                                newDlcLoaded++;
+                            }
+                        }
+                    }
+                }
+            }
+            finally
+            {
+                _cancellationToken.Dispose();
+                _cancellationToken = null;
+            }
+
+            return newDlcLoaded;
+        }
+
+        // Searches the provided directories for update NSP files that are _valid for the currently detected games in the
+        // library_, and then applies those updates. If a newly-detected update is a newer version than the currently
+        // selected update (or if no update is currently selected), then that update will be selected.
+        public int AutoLoadTitleUpdates(List<string> appDirs)
+        {
+            _cancellationToken = new CancellationTokenSource();
+
+            List<string> updatePaths = new();
+            int numUpdatesLoaded = 0;
+
+            try
+            {
+                foreach (string appDir in appDirs)
+                {
+                    if (_cancellationToken.Token.IsCancellationRequested)
+                    {
+                        return numUpdatesLoaded;
+                    }
+
+                    if (!Directory.Exists(appDir))
+                    {
+                        Logger.Warning?.Print(LogClass.Application,
+                            $"The specified autoload directory \"{appDir}\" does not exist.");
+
+                        continue;
+                    }
+
+                    try
+                    {
+                        EnumerationOptions options = new()
+                        {
+                            RecurseSubdirectories = true,
+                            IgnoreInaccessible = false,
+                        };
+
+                        IEnumerable<string> files = Directory.EnumerateFiles(appDir, "*", options).Where(
+                            file => Path.GetExtension(file).ToLower() is ".nsp");
+
+                        foreach (string app in files)
+                        {
+                            if (_cancellationToken.Token.IsCancellationRequested)
+                            {
+                                return numUpdatesLoaded;
+                            }
+
+                            var fileInfo = new FileInfo(app);
+
+                            try
+                            {
+                                var fullPath = fileInfo.ResolveLinkTarget(true)?.FullName ?? fileInfo.FullName;
+
+                                updatePaths.Add(fullPath);
+                            }
+                            catch (IOException exception)
+                            {
+                                Logger.Warning?.Print(LogClass.Application,
+                                    $"Failed to resolve the full path to file: \"{app}\" Error: {exception}");
+                            }
+                        }
+                    }
+                    catch (UnauthorizedAccessException)
+                    {
+                        Logger.Warning?.Print(LogClass.Application,
+                            $"Failed to get access to directory: \"{appDir}\"");
+                    }
+                }
+
+                var appIdLookup = Applications.Items.Select(it => it.IdBase).ToHashSet();
+
+                foreach (string updatePath in updatePaths)
+                {
+                    if (_cancellationToken.Token.IsCancellationRequested)
+                    {
+                        return numUpdatesLoaded;
+                    }
+
+                    if (TryGetTitleUpdatesFromFile(updatePath, out var foundUpdates))
+                    {
+                        foreach (var update in foundUpdates.Where(it => appIdLookup.Contains(it.TitleIdBase)))
+                        {
+                            if (!_titleUpdates.Lookup(update).HasValue)
+                            {
+                                var currentlySelected = TitleUpdates.Items.FirstOrOptional(it =>
+                                    it.TitleUpdate.TitleIdBase == update.TitleIdBase && it.IsSelected);
+
+                                var shouldSelect = !currentlySelected.HasValue ||
+                                                   currentlySelected.Value.TitleUpdate.Version < update.Version;
+                                _titleUpdates.AddOrUpdate((update, shouldSelect));
+                                SaveTitleUpdatesForGame(update.TitleIdBase);
+                                numUpdatesLoaded++;
+
+                                if (shouldSelect)
+                                {
+                                    RefreshApplicationInfo(update.TitleIdBase);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            finally
+            {
+                _cancellationToken.Dispose();
+                _cancellationToken = null;
+            }
+
+            return numUpdatesLoaded;
         }
 
         protected void OnApplicationCountUpdated(ApplicationCountUpdatedEventArgs e)
@@ -936,5 +1328,128 @@ namespace Ryujinx.UI.App.Common
 
             return false;
         }
+
+        private Nca TryOpenNca(IStorage ncaStorage)
+        {
+            try
+            {
+                return new Nca(_virtualFileSystem.KeySet, ncaStorage);
+            }
+            catch (Exception) { }
+
+            return null;
+        }
+
+        // Does a two-phase load of DLC. First reading the metadata on disk, then loading anything bundled in the game
+        // file itself
+        private void LoadDlcForApplication(ApplicationData application)
+        {
+            _downloadableContents.Edit(it =>
+            {
+                var savedDlc =
+                    DownloadableContentsHelper.LoadDownloadableContentsJson(_virtualFileSystem, application.IdBase);
+                it.AddOrUpdate(savedDlc);
+
+                if (TryGetDownloadableContentFromFile(application.Path, out var bundledDlc))
+                {
+                    var savedDlcLookup = savedDlc.Select(dlc => dlc.Item1).ToHashSet();
+
+                    bool addedNewDlc = false;
+                    foreach (var dlc in bundledDlc)
+                    {
+                        if (!savedDlcLookup.Contains(dlc))
+                        {
+                            addedNewDlc = true;
+                            it.AddOrUpdate((dlc, true));
+                        }
+                    }
+
+                    if (addedNewDlc)
+                    {
+                        var gameDlcs = it.Items.Where(dlc => dlc.Dlc.TitleIdBase == application.IdBase).ToList();
+                        DownloadableContentsHelper.SaveDownloadableContentsJson(_virtualFileSystem, application.IdBase,
+                            gameDlcs);
+                    }
+                }
+            });
+        }
+
+        // Does a two-phase load of updates. First reading the metadata on disk, then loading anything bundled in the game
+        // file itself
+        private bool LoadTitleUpdatesForApplication(ApplicationData application)
+        {
+            var modifiedVersion = false;
+
+            _titleUpdates.Edit(it =>
+            {
+                var savedUpdates =
+                    TitleUpdatesHelper.LoadTitleUpdatesJson(_virtualFileSystem, application.IdBase);
+                it.AddOrUpdate(savedUpdates);
+
+                var selectedUpdate = savedUpdates.FirstOrOptional(update => update.IsSelected);
+
+                if (TryGetTitleUpdatesFromFile(application.Path, out var bundledUpdates))
+                {
+                    var savedUpdateLookup = savedUpdates.Select(update => update.Item1).ToHashSet();
+
+                    bool addedNewUpdate = false;
+                    foreach (var update in bundledUpdates.OrderByDescending(bundled => bundled.Version))
+                    {
+                        if (!savedUpdateLookup.Contains(update))
+                        {
+                            bool shouldSelect = false;
+                            if (!selectedUpdate.HasValue || selectedUpdate.Value.Item1.Version < update.Version)
+                            {
+                                shouldSelect = true;
+                                selectedUpdate = Optional<(TitleUpdateModel, bool IsSelected)>.Create((update, true));
+                            }
+
+                            modifiedVersion = modifiedVersion || shouldSelect;
+                            it.AddOrUpdate((update, shouldSelect));
+
+                            addedNewUpdate = true;
+                        }
+                    }
+
+                    if (addedNewUpdate)
+                    {
+                        var gameUpdates = it.Items.Where(update => update.TitleUpdate.TitleIdBase == application.IdBase).ToList();
+                        TitleUpdatesHelper.SaveTitleUpdatesJson(_virtualFileSystem, application.IdBase, gameUpdates);
+                    }
+                }
+            });
+
+            return modifiedVersion;
+        }
+
+        // Save the _currently tracked_ DLC state for the game
+        private void SaveDownloadableContentsForGame(ulong titleIdBase)
+        {
+            var dlcs = DownloadableContents.Items.Where(dlc => dlc.Dlc.TitleIdBase == titleIdBase).ToList();
+            DownloadableContentsHelper.SaveDownloadableContentsJson(_virtualFileSystem, titleIdBase, dlcs);
+        }
+
+        // Save the _currently tracked_ update state for the game
+        private void SaveTitleUpdatesForGame(ulong titleIdBase)
+        {
+            var updates = TitleUpdates.Items.Where(update => update.TitleUpdate.TitleIdBase == titleIdBase).ToList();
+            TitleUpdatesHelper.SaveTitleUpdatesJson(_virtualFileSystem, titleIdBase, updates);
+        }
+
+        // ApplicationData isnt live-updating (e.g. when an update gets applied) and so this is meant to trigger a refresh
+        // of its state
+        private void RefreshApplicationInfo(ulong appIdBase)
+        {
+            var application = _applications.Lookup(appIdBase);
+
+            if (!application.HasValue)
+                return;
+
+            if (!TryGetApplicationsFromFile(application.Value.Path, out List<ApplicationData> newApplications))
+                return;
+
+            var newApplication = newApplications.First(it => it.IdBase == appIdBase);
+            _applications.AddOrUpdate(newApplication);
+        }
     }
 }

src/Ryujinx.UI.Common/Configuration/ConfigurationFileFormat.cs

@@ -15,7 +15,7 @@ namespace Ryujinx.UI.Common.Configuration
         /// <summary>
         /// The current version of the file format
         /// </summary>
-        public const int CurrentVersion = 51;
+        public const int CurrentVersion = 52;
 
         /// <summary>
         /// Version of the configuration file format
@@ -262,6 +262,11 @@ namespace Ryujinx.UI.Common.Configuration
         /// </summary>
         public List<string> GameDirs { get; set; }
 
+        /// <summary>
+        /// A list of directories containing DLC/updates the user wants to autoload during library refreshes
+        /// </summary>
+        public List<string> AutoloadDirs { get; set; }
+
         /// <summary>
         /// A list of file types to be hidden in the games List
         /// </summary>

src/Ryujinx.UI.Common/Configuration/ConfigurationState.cs

@@ -122,6 +122,11 @@ namespace Ryujinx.UI.Common.Configuration
             /// </summary>
             public ReactiveObject<List<string>> GameDirs { get; private set; }
 
+            /// <summary>
+            /// A list of directories containing DLC/updates the user wants to autoload during library refreshes
+            /// </summary>
+            public ReactiveObject<List<string>> AutoloadDirs { get; private set; }
+
             /// <summary>
             /// A list of file types to be hidden in the games List
             /// </summary>
@@ -192,6 +197,7 @@ namespace Ryujinx.UI.Common.Configuration
                 GuiColumns = new Columns();
                 ColumnSort = new ColumnSortSettings();
                 GameDirs = new ReactiveObject<List<string>>();
+                AutoloadDirs = new ReactiveObject<List<string>>();
                 ShownFileTypes = new ShownFileTypeSettings();
                 WindowStartup = new WindowStartupSettings();
                 EnableCustomTheme = new ReactiveObject<bool>();
@@ -728,6 +734,7 @@ namespace Ryujinx.UI.Common.Configuration
                     SortAscending = UI.ColumnSort.SortAscending,
                 },
                 GameDirs = UI.GameDirs,
+                AutoloadDirs = UI.AutoloadDirs,
                 ShownFileTypes = new ShownFileTypes
                 {
                     NSP = UI.ShownFileTypes.NSP,
@@ -836,6 +843,7 @@ namespace Ryujinx.UI.Common.Configuration
             UI.ColumnSort.SortColumnId.Value = 0;
             UI.ColumnSort.SortAscending.Value = false;
             UI.GameDirs.Value = new List<string>();
+            UI.AutoloadDirs.Value = new List<string>();
             UI.ShownFileTypes.NSP.Value = true;
             UI.ShownFileTypes.PFS0.Value = true;
             UI.ShownFileTypes.XCI.Value = true;
@@ -1477,6 +1485,15 @@ namespace Ryujinx.UI.Common.Configuration
                 configurationFileUpdated = true;
             }
 
+            if (configurationFileFormat.Version < 52)
+            {
+                Ryujinx.Common.Logging.Logger.Warning?.Print(LogClass.Application, $"Outdated configuration version {configurationFileFormat.Version}, migrating to version 52.");
+
+                configurationFileFormat.AutoloadDirs = new();
+
+                configurationFileUpdated = true;
+            }
+
             Logger.EnableFileLog.Value = configurationFileFormat.EnableFileLog;
             Graphics.ResScale.Value = configurationFileFormat.ResScale;
             Graphics.ResScaleCustom.Value = configurationFileFormat.ResScaleCustom;
@@ -1538,6 +1555,7 @@ namespace Ryujinx.UI.Common.Configuration
             UI.ColumnSort.SortColumnId.Value = configurationFileFormat.ColumnSort.SortColumnId;
             UI.ColumnSort.SortAscending.Value = configurationFileFormat.ColumnSort.SortAscending;
             UI.GameDirs.Value = configurationFileFormat.GameDirs;
+            UI.AutoloadDirs.Value = configurationFileFormat.AutoloadDirs;
             UI.ShownFileTypes.NSP.Value = configurationFileFormat.ShownFileTypes.NSP;
             UI.ShownFileTypes.PFS0.Value = configurationFileFormat.ShownFileTypes.PFS0;
             UI.ShownFileTypes.XCI.Value = configurationFileFormat.ShownFileTypes.XCI;

src/Ryujinx.UI.Common/Helper/DownloadableContentsHelper.cs

@@ -0,0 +1,135 @@
+using LibHac.Common;
+using LibHac.Fs;
+using LibHac.Fs.Fsa;
+using LibHac.Tools.FsSystem;
+using LibHac.Tools.FsSystem.NcaUtils;
+using Ryujinx.Common.Configuration;
+using Ryujinx.Common.Logging;
+using Ryujinx.Common.Utilities;
+using Ryujinx.HLE.FileSystem;
+using Ryujinx.HLE.Utilities;
+using Ryujinx.UI.Common.Models;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Path = System.IO.Path;
+
+namespace Ryujinx.UI.Common.Helper
+{
+    public static class DownloadableContentsHelper
+    {
+        private static readonly DownloadableContentJsonSerializerContext _serializerContext = new(JsonHelper.GetDefaultSerializerOptions());
+
+        public static List<(DownloadableContentModel, bool IsEnabled)> LoadDownloadableContentsJson(VirtualFileSystem vfs, ulong applicationIdBase)
+        {
+            var downloadableContentJsonPath = PathToGameDLCJson(applicationIdBase);
+
+            if (!File.Exists(downloadableContentJsonPath))
+            {
+                return [];
+            }
+
+            try
+            {
+                var downloadableContentContainerList = JsonHelper.DeserializeFromFile(downloadableContentJsonPath,
+                    _serializerContext.ListDownloadableContentContainer);
+                return LoadDownloadableContents(vfs, downloadableContentContainerList);
+            }
+            catch
+            {
+                Logger.Error?.Print(LogClass.Configuration, "Downloadable Content JSON failed to deserialize.");
+                return [];
+            }
+        }
+
+        public static void SaveDownloadableContentsJson(VirtualFileSystem vfs, ulong applicationIdBase, List<(DownloadableContentModel, bool IsEnabled)> dlcs)
+        {
+            DownloadableContentContainer container = default;
+            List<DownloadableContentContainer> downloadableContentContainerList = new();
+
+            foreach ((DownloadableContentModel dlc, bool isEnabled) in dlcs)
+            {
+                if (container.ContainerPath != dlc.ContainerPath)
+                {
+                    if (!string.IsNullOrWhiteSpace(container.ContainerPath))
+                    {
+                        downloadableContentContainerList.Add(container);
+                    }
+
+                    container = new DownloadableContentContainer
+                    {
+                        ContainerPath = dlc.ContainerPath,
+                        DownloadableContentNcaList = [],
+                    };
+                }
+
+                container.DownloadableContentNcaList.Add(new DownloadableContentNca
+                {
+                    Enabled = isEnabled,
+                    TitleId = dlc.TitleId,
+                    FullPath = dlc.FullPath,
+                });
+            }
+
+            if (!string.IsNullOrWhiteSpace(container.ContainerPath))
+            {
+                downloadableContentContainerList.Add(container);
+            }
+
+            var downloadableContentJsonPath = PathToGameDLCJson(applicationIdBase);
+            JsonHelper.SerializeToFile(downloadableContentJsonPath, downloadableContentContainerList, _serializerContext.ListDownloadableContentContainer);
+        }
+
+        private static List<(DownloadableContentModel, bool IsEnabled)> LoadDownloadableContents(VirtualFileSystem vfs, List<DownloadableContentContainer> downloadableContentContainers)
+        {
+            var result = new List<(DownloadableContentModel, bool IsEnabled)>();
+
+            foreach (DownloadableContentContainer downloadableContentContainer in downloadableContentContainers)
+            {
+                if (!File.Exists(downloadableContentContainer.ContainerPath))
+                {
+                    continue;
+                }
+
+                using IFileSystem partitionFileSystem = PartitionFileSystemUtils.OpenApplicationFileSystem(downloadableContentContainer.ContainerPath, vfs);
+
+                foreach (DownloadableContentNca downloadableContentNca in downloadableContentContainer.DownloadableContentNcaList)
+                {
+                    using UniqueRef<IFile> ncaFile = new();
+
+                    partitionFileSystem.OpenFile(ref ncaFile.Ref, downloadableContentNca.FullPath.ToU8Span(), OpenMode.Read).ThrowIfFailure();
+
+                    Nca nca = TryOpenNca(vfs, ncaFile.Get.AsStorage());
+                    if (nca == null)
+                    {
+                        continue;
+                    }
+
+                    var content = new DownloadableContentModel(nca.Header.TitleId,
+                        downloadableContentContainer.ContainerPath,
+                        downloadableContentNca.FullPath);
+
+                    result.Add((content, downloadableContentNca.Enabled));
+                }
+            }
+
+            return result;
+        }
+
+        private static Nca TryOpenNca(VirtualFileSystem vfs, IStorage ncaStorage)
+        {
+            try
+            {
+                return new Nca(vfs.KeySet, ncaStorage);
+            }
+            catch (Exception) { }
+
+            return null;
+        }
+
+        private static string PathToGameDLCJson(ulong applicationIdBase)
+        {
+            return Path.Combine(AppDataManager.GamesDirPath, applicationIdBase.ToString("x16"), "dlc.json");
+        }
+    }
+}

src/Ryujinx.UI.Common/Helper/TitleUpdatesHelper.cs

@@ -0,0 +1,162 @@
+using LibHac.Common;
+using LibHac.Common.Keys;
+using LibHac.Fs;
+using LibHac.Fs.Fsa;
+using LibHac.Ncm;
+using LibHac.Ns;
+using LibHac.Tools.FsSystem;
+using LibHac.Tools.FsSystem.NcaUtils;
+using Ryujinx.Common.Configuration;
+using Ryujinx.Common.Logging;
+using Ryujinx.Common.Utilities;
+using Ryujinx.HLE.FileSystem;
+using Ryujinx.HLE.Loaders.Processes.Extensions;
+using Ryujinx.HLE.Utilities;
+using Ryujinx.UI.Common.Configuration;
+using Ryujinx.UI.Common.Models;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using ContentType = LibHac.Ncm.ContentType;
+using Path = System.IO.Path;
+using SpanHelpers = LibHac.Common.SpanHelpers;
+using TitleUpdateMetadata = Ryujinx.Common.Configuration.TitleUpdateMetadata;
+
+namespace Ryujinx.UI.Common.Helper
+{
+    public static class TitleUpdatesHelper
+    {
+        private static readonly TitleUpdateMetadataJsonSerializerContext _serializerContext = new(JsonHelper.GetDefaultSerializerOptions());
+
+        public static List<(TitleUpdateModel, bool IsSelected)> LoadTitleUpdatesJson(VirtualFileSystem vfs, ulong applicationIdBase)
+        {
+            var titleUpdatesJsonPath = PathToGameUpdatesJson(applicationIdBase);
+
+            if (!File.Exists(titleUpdatesJsonPath))
+            {
+                return [];
+            }
+
+            try
+            {
+                var titleUpdateWindowData = JsonHelper.DeserializeFromFile(titleUpdatesJsonPath, _serializerContext.TitleUpdateMetadata);
+                return LoadTitleUpdates(vfs, titleUpdateWindowData, applicationIdBase);
+            }
+            catch
+            {
+                Logger.Warning?.Print(LogClass.Application, $"Failed to deserialize title update data for {applicationIdBase:x16} at {titleUpdatesJsonPath}");
+                return [];
+            }
+        }
+
+        public static void SaveTitleUpdatesJson(VirtualFileSystem vfs, ulong applicationIdBase, List<(TitleUpdateModel, bool IsSelected)> updates)
+        {
+            var titleUpdateWindowData = new TitleUpdateMetadata
+            {
+                Selected = "",
+                Paths = [],
+            };
+
+            foreach ((TitleUpdateModel update, bool isSelected) in updates)
+            {
+                titleUpdateWindowData.Paths.Add(update.Path);
+                if (isSelected)
+                {
+                    if (!string.IsNullOrEmpty(titleUpdateWindowData.Selected))
+                    {
+                        Logger.Error?.Print(LogClass.Application,
+                            $"Tried to save two updates as 'IsSelected' for {applicationIdBase:x16}");
+                        return;
+                    }
+
+                    titleUpdateWindowData.Selected = update.Path;
+                }
+            }
+
+            var titleUpdatesJsonPath = PathToGameUpdatesJson(applicationIdBase);
+            JsonHelper.SerializeToFile(titleUpdatesJsonPath, titleUpdateWindowData, _serializerContext.TitleUpdateMetadata);
+        }
+
+        private static List<(TitleUpdateModel, bool IsSelected)> LoadTitleUpdates(VirtualFileSystem vfs, TitleUpdateMetadata titleUpdateMetadata, ulong applicationIdBase)
+        {
+            var result = new List<(TitleUpdateModel, bool IsSelected)>();
+
+            IntegrityCheckLevel checkLevel = ConfigurationState.Instance.System.EnableFsIntegrityChecks
+                ? IntegrityCheckLevel.ErrorOnInvalid
+                : IntegrityCheckLevel.None;
+
+            foreach (string path in titleUpdateMetadata.Paths)
+            {
+                if (!File.Exists(path))
+                {
+                    continue;
+                }
+
+                try
+                {
+                    using IFileSystem pfs = PartitionFileSystemUtils.OpenApplicationFileSystem(path, vfs);
+
+                    Dictionary<ulong, ContentMetaData> updates =
+                        pfs.GetContentData(ContentMetaType.Patch, vfs, checkLevel);
+
+                    Nca patchNca = null;
+                    Nca controlNca = null;
+
+                    if (!updates.TryGetValue(applicationIdBase, out ContentMetaData content))
+                    {
+                        continue;
+                    }
+
+                    patchNca = content.GetNcaByType(vfs.KeySet, ContentType.Program);
+                    controlNca = content.GetNcaByType(vfs.KeySet, ContentType.Control);
+
+                    if (controlNca == null || patchNca == null)
+                    {
+                        continue;
+                    }
+
+                    ApplicationControlProperty controlData = new();
+
+                    using UniqueRef<IFile> nacpFile = new();
+
+                    controlNca.OpenFileSystem(NcaSectionType.Data, IntegrityCheckLevel.None)
+                        .OpenFile(ref nacpFile.Ref, "/control.nacp".ToU8Span(), OpenMode.Read).ThrowIfFailure();
+                    nacpFile.Get.Read(out _, 0, SpanHelpers.AsByteSpan(ref controlData), ReadOption.None)
+                        .ThrowIfFailure();
+
+                    var displayVersion = controlData.DisplayVersionString.ToString();
+                    var update = new TitleUpdateModel(content.ApplicationId, content.Version.Version,
+                        displayVersion, path);
+
+                    result.Add((update, path == titleUpdateMetadata.Selected));
+                }
+                catch (MissingKeyException exception)
+                {
+                    Logger.Warning?.Print(LogClass.Application,
+                        $"Your key set is missing a key with the name: {exception.Name}");
+                }
+                catch (InvalidDataException)
+                {
+                    Logger.Warning?.Print(LogClass.Application,
+                        $"The header key is incorrect or missing and therefore the NCA header content type check has failed. Errored File: {path}");
+                }
+                catch (IOException exception)
+                {
+                    Logger.Warning?.Print(LogClass.Application, exception.Message);
+                }
+                catch (Exception exception)
+                {
+                    Logger.Warning?.Print(LogClass.Application,
+                        $"The file encountered was not of a valid type. File: '{path}' Error: {exception}");
+                }
+            }
+
+            return result;
+        }
+
+        private static string PathToGameUpdatesJson(ulong applicationIdBase)
+        {
+            return Path.Combine(AppDataManager.GamesDirPath, applicationIdBase.ToString("x16"), "updates.json");
+        }
+    }
+}

src/Ryujinx.UI.Common/Models/DownloadableContentModel.cs

@@ -0,0 +1,12 @@
+namespace Ryujinx.UI.Common.Models
+{
+    // NOTE: most consuming code relies on this model being value-comparable
+    public record DownloadableContentModel(ulong TitleId, string ContainerPath, string FullPath)
+    {
+        public bool IsBundled { get; } = System.IO.Path.GetExtension(ContainerPath)?.ToLower() == ".xci";
+
+        public string FileName => System.IO.Path.GetFileName(ContainerPath);
+        public string TitleIdStr => TitleId.ToString("x16");
+        public ulong TitleIdBase => TitleId & ~0x1FFFUL;
+    }
+}

src/Ryujinx.UI.Common/Models/TitleUpdateModel.cs

@@ -0,0 +1,11 @@
+namespace Ryujinx.UI.Common.Models
+{
+    // NOTE: most consuming code relies on this model being value-comparable
+    public record TitleUpdateModel(ulong TitleId, ulong Version, string DisplayVersion, string Path)
+    {
+        public bool IsBundled { get; } = System.IO.Path.GetExtension(Path)?.ToLower() == ".xci";
+
+        public string TitleIdStr => TitleId.ToString("x16");
+        public ulong TitleIdBase => TitleId & ~0x1FFFUL;
+    }
+}

src/Ryujinx.UI.Common/Ryujinx.UI.Common.csproj

@@ -56,6 +56,7 @@
 
   <ItemGroup>
     <PackageReference Include="DiscordRichPresence" />
+    <PackageReference Include="DynamicData" />
     <PackageReference Include="securifybv.ShellLink" />
   </ItemGroup>