added support for modpack defined in version descriptor

Mlaumcherb.Client.Avalonia/GameVersion.cs

@@ -36,7 +36,7 @@ public class GameVersion
         foreach (IOPath subdir in Directory.GetDirectories(GetVersionsDir()))
         {
             string name = subdir.LastName().ToString();
-            var d = new GameVersionProps(name, null);
+            var d = new GameVersionProps(name);
             if(!File.Exists(d.LocalDescriptorPath))
                 throw new Exception("Can't find version descriptor file in directory '{subdir}'. Rename it as directory name.");
             propsList.Add(d);
@@ -47,14 +47,15 @@ public class GameVersion
         return Task.FromResult(propsList);
     }
 
-    public static async Task<GameVersion> CreateFromPropsAsync(GameVersionProps props)
+    public static async Task<GameVersion> CreateFromPropsAsync(GameVersionProps props, bool checkHash)
     {
+        //TODO: refresh version descriptor from server
         if (!File.Exists(props.LocalDescriptorPath))
         {
-            if (props.RemoteDescriptorUrl is null)
+            if (props.RemoteProps is null)
                 throw new NullReferenceException("can't download game version descriptor '"
                                                  + props.Name + "', because RemoteDescriptorUrl is null");
-            await NetworkHelper.DownloadFile(props.RemoteDescriptorUrl, props.LocalDescriptorPath);
+            await NetworkHelper.DownloadFile(props.RemoteProps.url, props.LocalDescriptorPath);
         }
 
         return new GameVersion(props);
@@ -104,17 +105,17 @@ public class GameVersion
         [
             new AssetsDownloadTaskFactory(_descriptor),
             new LibrariesDownloadTaskFactory(_descriptor, _libraries),
-            new VersionJarDownloadTaskFactory(_descriptor),
         ];
         if (LauncherApp.Config.download_java)
         {
             taskFactories.Add(new JavaDownloadTaskFactory(_descriptor));
         }
-        //TODO: modpack
+        if (_descriptor.modpack != null)
-        /*if (modpack != null)
         {
-            taskFactories.Add(new ModpackDownloadTaskFactory(modpack));
+            taskFactories.Add(new ModpackDownloadTaskFactory(_descriptor));
-        }*/
+        }
+        // has to be downloaded last because it is used by GameVersionProps to check if version is installed
+        taskFactories.Add(new VersionJarDownloadTaskFactory(_descriptor));
         
         var networkTasks = new List<NetworkTask>();
         for (int i = 0; i < taskFactories.Count; i++)

Mlaumcherb.Client.Avalonia/зримое/MainWindow.axaml.cs

@@ -134,7 +134,7 @@ public partial class MainWindow : Window
             if (selectedVersion == null) 
                 return;
             
-            var v = await GameVersion.CreateFromPropsAsync(selectedVersion);
+            var v = await GameVersion.CreateFromPropsAsync(selectedVersion, CheckGameFiles);
             await v.UpdateFiles(CheckGameFiles, nt =>
                 {
                     Dispatcher.UIThread.Invoke(() =>

Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionCatalog.cs

@@ -26,7 +26,7 @@ public class GameVersionCatalog
                 _ => p.OtherTypeAllowed
             };
             if(match)
-                _versionPropsList.Add(new GameVersionProps(r.id, r.url));
+                _versionPropsList.Add(new GameVersionProps(r));
         }
         return _versionPropsList;
     }

Mlaumcherb.Client.Avalonia/классы/Буржуазия/GameVersionDescriptor.cs

@@ -17,6 +17,9 @@ public class GameVersionDescriptor
     public JavaVersion javaVersion { get; set; } = new() { component = "jre-legacy", majorVersion = 8 };
     public string? minecraftArguments { get; set; }
     public ArgumentsNew? arguments { get; set; }
+    
+    // my additions
+    public MyModpackRemoteProps? modpack { get; set; }
 }
 
 public class Artifact

Mlaumcherb.Client.Avalonia/классы/Пролетариат/FilesManifest.cs

@@ -0,0 +1,30 @@
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class ModpackFilesManifest
+{
+    public class FileProps
+    {
+        [JsonRequired] public string sha1 { get; set; }
+        public bool allow_edit { get; set; } = false;
+    }
+    
+    /// relative_path, hash
+    [JsonRequired] public Dictionary<string, FileProps> files { get; set; } = new();
+
+    public bool CheckFiles(IOPath basedir, bool checkHashes, HashSet<IOPath> unmatchedFilesLocalPaths)
+    {
+        foreach (var p in files)
+        {
+            var localPath = new IOPath(p.Key);
+            var realPath = Path.Concat(basedir, localPath);
+            if (!HashHelper.CheckFileSHA1(realPath, p.Value.sha1, checkHashes && !p.Value.allow_edit))
+            {
+                unmatchedFilesLocalPaths.Add(localPath);
+            }
+        }
+        
+        return unmatchedFilesLocalPaths.Count == 0;
+    }
+}

Mlaumcherb.Client.Avalonia/классы/Пролетариат/GameVersionProps.cs

@@ -7,7 +7,7 @@ public class GameVersionProps : IComparable<GameVersionProps>, IEquatable<GameVe
 {
     public string Name { get; }
     public IOPath LocalDescriptorPath { get; }
-    public string? RemoteDescriptorUrl { get; }
+    public RemoteVersionDescriptorProps? RemoteProps { get; }
     private bool _isDownloaded;
     public bool IsDownloaded
     {
@@ -23,13 +23,22 @@ public class GameVersionProps : IComparable<GameVersionProps>, IEquatable<GameVe
     }
     public event Action<bool>? StatusChanged;
 
-    public GameVersionProps(string name, string? url)
+    private GameVersionProps(string name, RemoteVersionDescriptorProps? remoteProps)
     {
+        
         Name = name;
+        RemoteProps = remoteProps;
         LocalDescriptorPath = PathHelper.GetVersionDescriptorPath(name);
-        RemoteDescriptorUrl = url;
         IsDownloaded = File.Exists(PathHelper.GetVersionJarFilePath(name));
     }
+    
+    public GameVersionProps(string name) 
+        : this(name, null)
+    { }
+    
+    public GameVersionProps(RemoteVersionDescriptorProps remoteProps)
+        : this(remoteProps.id, remoteProps)
+    { }
 
     public void DeleteFiles()
     {

Mlaumcherb.Client.Avalonia/классы/Пролетариат/MyModpack.cs

@@ -0,0 +1,19 @@
+namespace Mlaumcherb.Client.Avalonia.классы;
+
+public class MyModpackRemoteProps
+{
+    [JsonRequired] public int format_version { get; set; }
+    [JsonRequired] public Artifact artifact { get; set; } = null!;
+}
+
+public class MyModpackV1
+{
+
+    // 1
+    [JsonRequired] public int format_version { get; set; }
+    [JsonRequired] public string name { get; set; }
+    // zip archive with all files
+    [JsonRequired] public Artifact zip { get; set; } = null!;
+    // ModpackFilesManifest
+    [JsonRequired] public Artifact manifest { get; set; } = null!;
+}

Mlaumcherb.Client.Avalonia/сеть/NetworkHelper.cs

@@ -1,6 +1,5 @@
 using System.Net.Http;
-using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.холопы;
-using Mlaumcherb.Client.Avalonia.классы;
 
 namespace Mlaumcherb.Client.Avalonia.сеть;
 
@@ -41,4 +40,25 @@ public static class NetworkHelper
             ?? throw new Exception($"can't deserialize {typeof(T).Name}");
         return result;
     }
+    
+    
+    public static async Task<string> ReadOrDownload(IOPath filePath, string url, 
+        string? sha1, bool checkHashes)
+    {
+        if (HashHelper.CheckFileSHA1(filePath, sha1, checkHashes)) 
+            return File.ReadAllText(filePath);
+        
+        string txt = await NetworkHelper.GetString(url);
+        File.WriteAllText(filePath, txt);
+        return txt;
+    }
+
+    public static async Task<T> ReadOrDownloadAndDeserialize<T>(IOPath filePath, string url,
+        string? sha1, bool checkHashes)
+    {
+        string text = await ReadOrDownload(filePath, url, sha1, checkHashes);
+        var result = JsonConvert.DeserializeObject<T>(text)
+                     ?? throw new Exception($"can't deserialize {typeof(T).Name}");
+        return result;
+    }
 }

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/AssetsDownloadTaskFactory.cs

@@ -1,7 +1,5 @@
 using System.Net;
 using System.Net.Http;
-using System.Security.Cryptography;
-using DTLib.Extensions;
 using Mlaumcherb.Client.Avalonia.зримое;
 using Mlaumcherb.Client.Avalonia.классы;
 using Mlaumcherb.Client.Avalonia.холопы;
@@ -13,14 +11,12 @@ public class AssetsDownloadTaskFactory : INetworkTaskFactory
 {
     private const string ASSET_SERVER_URL = "https://resources.download.minecraft.net/";
     private GameVersionDescriptor _descriptor;
-    private SHA1 _hasher;
     private IOPath _indexFilePath;
     List<AssetDownloadProperties> _assetsToDownload = new();
 
     public AssetsDownloadTaskFactory(GameVersionDescriptor descriptor)
     {
         _descriptor = descriptor;
-        _hasher = SHA1.Create();
         _indexFilePath = PathHelper.GetAssetIndexFilePath(_descriptor.assetIndex.id);
     }
     
@@ -37,22 +33,11 @@ public class AssetsDownloadTaskFactory : INetworkTaskFactory
     }
     private async Task<bool> CheckFilesAsync(bool checkHashes)
     {
-        string assetIndexHash = "";
+        var assetIndex = await ReadOrDownloadAndDeserialize<AssetIndex>(
-        if(checkHashes)
+            _indexFilePath,
-        {
+            _descriptor.assetIndex.url, 
-            await using var fs = File.OpenRead(_indexFilePath);
+            _descriptor.assetIndex.sha1,
-            assetIndexHash = _hasher.ComputeHash(fs).HashToString();
+            checkHashes);
-        }
-        if(!File.Exists(_indexFilePath) || (checkHashes && assetIndexHash != _descriptor.assetIndex.sha1))
-        {
-            LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading asset index to '{_indexFilePath}'");
-            await DownloadFile(_descriptor.assetIndex.url, _indexFilePath);
-            LauncherApp.Logger.LogInfo(nameof(NetworkHelper), "finished downloading asset index");
-        }
-
-        string indexFileText = File.ReadAllText(_indexFilePath);
-        var assetIndex = JsonConvert.DeserializeObject<AssetIndex>(indexFileText) 
-                     ?? throw new Exception($"can't deserialize asset index file '{_indexFilePath}'");
         
         _assetsToDownload.Clear();
         // removing duplicates for Dictionary (idk how can it be possible, but Newtonsoft.Json creates them)
@@ -62,17 +47,10 @@ public class AssetsDownloadTaskFactory : INetworkTaskFactory
             if (assetHashes.Add(pair.Value.hash))
             {
                 var a = new AssetDownloadProperties(pair.Key, pair.Value);
-                if (!File.Exists(a.filePath))
+                if (!HashHelper.CheckFileSHA1(a.filePath, a.hash, checkHashes))
                 {
                     _assetsToDownload.Add(a);
                 }
-                else if(checkHashes)
-                {
-                    await using var fs = File.OpenRead(a.filePath);
-                    string hash = _hasher.ComputeHash(fs).HashToString();
-                    if (hash != a.hash)
-                        _assetsToDownload.Add(a);
-                }
             }
         }
         

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/JavaDownloadTaskFactory.cs

@@ -1,6 +1,4 @@
-using System.Security.Cryptography;
+using Mlaumcherb.Client.Avalonia.зримое;
-using DTLib.Extensions;
-using Mlaumcherb.Client.Avalonia.зримое;
 using Mlaumcherb.Client.Avalonia.классы;
 using Mlaumcherb.Client.Avalonia.холопы;
 using static Mlaumcherb.Client.Avalonia.сеть.NetworkHelper;
@@ -13,7 +11,6 @@ public class JavaDownloadTaskFactory : INetworkTaskFactory
         "https://launchermeta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json";
     private GameVersionDescriptor _descriptor;
     private IOPath _javaVersionDir;
-    private SHA1 _hasher;
     private JavaDistributiveManifest? _distributiveManifest;
     private List<(IOPath path, JavaDistributiveElementProps props)> _filesToDownload = new();
     
@@ -21,7 +18,6 @@ public class JavaDownloadTaskFactory : INetworkTaskFactory
     {
         _descriptor = descriptor;
         _javaVersionDir = PathHelper.GetJavaRuntimeDir(_descriptor.javaVersion.component);
-        _hasher = SHA1.Create();
     }
 
     public async Task<NetworkTask?> CreateAsync(bool checkHashes)
@@ -52,18 +48,10 @@ public class JavaDownloadTaskFactory : INetworkTaskFactory
             {
                 var artifact = pair.Value.downloads;
                 IOPath file_path = Path.Concat(_javaVersionDir, pair.Key);
-                if (!File.Exists(file_path))
+                if (!HashHelper.CheckFileSHA1(file_path, artifact.raw.sha1, checkHashes))
                 {
                     _filesToDownload.Add((file_path, pair.Value));
                 }
-                else if(checkHashes)
-                {
-                    using var fs = File.OpenRead(file_path);
-                    if (_hasher.ComputeHash(fs).HashToString() != artifact.raw.sha1)
-                    {
-                        _filesToDownload.Add((file_path, pair.Value));
-                    }
-                }
             }
         }
 

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/LibrariesDownloadTaskFactory.cs

@@ -1,6 +1,4 @@
 using System.IO.Compression;
-using System.Security.Cryptography;
-using DTLib.Extensions;
 using Mlaumcherb.Client.Avalonia.зримое;
 using Mlaumcherb.Client.Avalonia.классы;
 using Mlaumcherb.Client.Avalonia.холопы;
@@ -12,7 +10,6 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
 {
     private GameVersionDescriptor _descriptor;
     private Libraries _libraries;
-    private SHA1 _hasher;
     private List<Libraries.JarLib> _libsToDownload = new();
     private IOPath _nativesDir;
 
@@ -20,7 +17,6 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
     {
         _descriptor = descriptor;
         _libraries = libraries;
-        _hasher = SHA1.Create();
         _nativesDir = PathHelper.GetNativeLibrariesDir(descriptor.id);
     }
     
@@ -43,21 +39,15 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
         
         foreach (var l in _libraries.Libs)
         {
-            if (!File.Exists(l.jarFilePath))
+            if (!HashHelper.CheckFileSHA1(l.jarFilePath, l.artifact.sha1, checkHashes))
             {
                 _libsToDownload.Add(l);
             }
+            //TODO: replace with actual native assets check
             else if (!nativeDirExists && l is Libraries.NativeLib)
             {
                 _libsToDownload.Add(l);
             }
-            else if (checkHashes)
-            {
-                using var fs = File.OpenRead(l.jarFilePath);
-                string hash = _hasher.ComputeHash(fs).HashToString();
-                if(hash != l.artifact.sha1)
-                    _libsToDownload.Add(l);
-            }
         }
 
         return _libsToDownload.Count == 0;
@@ -88,7 +78,8 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
             await DownloadFile(l.artifact.url, l.jarFilePath, _ct, pr.AddBytesCount);
             if (l is Libraries.NativeLib n)
             {
-                var zipf = File.OpenRead(n.jarFilePath);
+                await using var zipf = File.OpenRead(n.jarFilePath);
+                //TODO: replace following code with manual extraction
                 ZipFile.ExtractToDirectory(zipf, _nativesDir.ToString(), true);
                 if (n.extractionOptions?.exclude != null)
                 {

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/ModpackDownloadTaskFactory.cs

@@ -0,0 +1,102 @@
+using System.IO.Compression;
+using Mlaumcherb.Client.Avalonia.зримое;
+using Mlaumcherb.Client.Avalonia.классы;
+using Mlaumcherb.Client.Avalonia.холопы;
+
+namespace Mlaumcherb.Client.Avalonia.сеть.TaskFactories;
+
+public class ModpackDownloadTaskFactory : INetworkTaskFactory
+{
+    INetworkTaskFactory _implementationVersion;
+    
+    public ModpackDownloadTaskFactory(GameVersionDescriptor descriptor)
+    {
+        if(descriptor.modpack is null)
+            throw new ArgumentNullException(nameof(descriptor.modpack));
+        _implementationVersion = descriptor.modpack.format_version switch
+        {
+            1 => new MyModpackV1DownloadTaskFactory(descriptor),
+            _ => throw new Exception($"Unknown Modpack format_version: {descriptor.modpack.format_version}")
+        };
+    }
+
+    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        return _implementationVersion.CreateAsync(checkHashes);
+    }
+}
+
+public class MyModpackV1DownloadTaskFactory : INetworkTaskFactory
+{
+    private IOPath _modpackManifesPath;
+    private readonly GameVersionDescriptor _descriptor;
+    private IOPath _modpackDescriptorPath;
+    private IOPath _versionDir;
+    private MyModpackV1? _modpack;
+    private ModpackFilesManifest? _modpackManifest;
+    private HashSet<IOPath> _filesToDosnload = new();
+
+    public MyModpackV1DownloadTaskFactory(GameVersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _modpackDescriptorPath = PathHelper.GetModpackDescriptorPath(_descriptor.id);
+        _modpackManifesPath = PathHelper.GetModpackManifestPath(_descriptor.id);
+        _versionDir = PathHelper.GetVersionDir(_descriptor.id);
+    }
+    
+    public async Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        if(_descriptor.modpack is null)
+            throw new ArgumentNullException(nameof(_descriptor.modpack));
+
+
+        _modpack = await NetworkHelper.ReadOrDownloadAndDeserialize<MyModpackV1>(
+            _modpackDescriptorPath,
+            _descriptor.modpack.artifact.url, 
+            _descriptor.modpack.artifact.sha1,
+            checkHashes);
+        if (_modpack.format_version != _descriptor.modpack.format_version)
+            throw new Exception($"Modpack.format_version mismatches descriptor.modpack.version: " +
+                                $"{_modpack.format_version} != {_descriptor.modpack.format_version}");
+
+        _modpackManifest = await NetworkHelper.ReadOrDownloadAndDeserialize<ModpackFilesManifest>(
+            _modpackManifesPath,
+            _modpack.manifest.url, 
+            _modpack.manifest.sha1, 
+            checkHashes);
+
+        if(!_modpackManifest.CheckFiles(_versionDir, checkHashes, _filesToDosnload))
+            return new NetworkTask(
+                $"modpack '{_descriptor.assetIndex.id}'",
+                _modpack.zip.size,
+                Download
+            );
+
+        return null;
+    }
+
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading modpack '{_modpack!.name}'");
+        if(string.IsNullOrEmpty(_modpack.zip.url))
+            throw new Exception($"modpack '{_modpack.name}' doesn't have a url to download");
+
+        var _archivePath = Path.Concat("downloads/modpacks", _modpack.name + ".zip");
+        await NetworkHelper.DownloadFile(_modpack.zip.url, _archivePath, ct, pr.AddBytesCount);
+        
+        await using var zipf = File.OpenRead(_archivePath);
+        using var archive = new ZipArchive(zipf);
+        foreach (var entry in archive.Entries)
+        {
+            IOPath localPath = new(entry.FullName);
+            if(_filesToDosnload.Contains(localPath))
+            {
+                var real_path = Path.Concat(_versionDir, localPath);
+                Directory.Create(real_path.ParentDir());
+                entry.ExtractToFile(real_path.ToString(), true);
+            }
+        }
+        
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"finished downloading modpack '{_modpack.name}'");
+    }
+}

Mlaumcherb.Client.Avalonia/сеть/TaskFactories/VersionJarDownloadTaskFactory.cs

@@ -1,6 +1,4 @@
-using System.Security.Cryptography;
+using Mlaumcherb.Client.Avalonia.зримое;
-using DTLib.Extensions;
-using Mlaumcherb.Client.Avalonia.зримое;
 using Mlaumcherb.Client.Avalonia.классы;
 using Mlaumcherb.Client.Avalonia.холопы;
 using static Mlaumcherb.Client.Avalonia.сеть.NetworkHelper;
@@ -11,13 +9,11 @@ public class VersionJarDownloadTaskFactory : INetworkTaskFactory
 {
     private GameVersionDescriptor _descriptor;
     private IOPath _filePath;
-    private SHA1 _hasher;
     
     public VersionJarDownloadTaskFactory(GameVersionDescriptor descriptor)
     {
         _descriptor = descriptor;
         _filePath = PathHelper.GetVersionJarFilePath(_descriptor.id);
-        _hasher = SHA1.Create();
     }
 
     public Task<NetworkTask?> CreateAsync(bool checkHashes)
@@ -25,7 +21,7 @@ public class VersionJarDownloadTaskFactory : INetworkTaskFactory
         NetworkTask? networkTask = null;
         if (!CheckFiles(checkHashes))
             networkTask = new NetworkTask(
-                    $"version jar '{_descriptor.id}'",
+                    $"game version jar '{_descriptor.id}'",
                     GetTotalSize(),
                     Download
                 );
@@ -34,18 +30,7 @@ public class VersionJarDownloadTaskFactory : INetworkTaskFactory
 
     private bool CheckFiles(bool checkHashes)
     {
-        if (!File.Exists(_filePath))
+        return HashHelper.CheckFileSHA1(_filePath, _descriptor.downloads?.client.sha1, checkHashes);
-            return false;
-        
-        if (!checkHashes)
-            return true;
-
-        if (_descriptor.downloads is null)
-            return true;
-        
-        using var fs = File.OpenRead(_filePath);
-        string hash = _hasher.ComputeHash(fs).HashToString();
-        return hash == _descriptor.downloads.client.sha1;
     }
 
     private long GetTotalSize()
@@ -58,10 +43,10 @@ public class VersionJarDownloadTaskFactory : INetworkTaskFactory
     private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
     {
         if (_descriptor.downloads is null)
-            throw new Exception($"can't download version jar '{_descriptor.id}' because it has no download url");
+            throw new Exception($"can't download game version jar '{_descriptor.id}' because it has no download url");
         
-        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading version jar '{_descriptor.id}'");
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"started downloading game version jar '{_descriptor.id}'");
         await DownloadFile(_descriptor.downloads.client.url, _filePath, ct, pr.AddBytesCount);
-        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"finished downloading version jar '{_descriptor.id}'");
+        LauncherApp.Logger.LogInfo(nameof(NetworkHelper), $"finished downloading game version jar '{_descriptor.id}'");
     }
 }

Mlaumcherb.Client.Avalonia/холопы/HashHelper.cs

@@ -0,0 +1,32 @@
+using System.Security.Cryptography;
+using DTLib.Extensions;
+
+namespace Mlaumcherb.Client.Avalonia.холопы;
+
+public static class HashHelper
+{
+    private static SHA1 _hasher;
+
+    static HashHelper()
+    {
+        _hasher = SHA1.Create();
+    }
+
+    public static string HashFileSHA1(IOPath f)
+    {
+        using var fs = File.OpenRead(f);
+        byte[] hash = _hasher.ComputeHash(fs);
+        return hash.HashToString();
+    }
+
+    public static bool CheckFileSHA1(IOPath f, string? sha1, bool checkHash)
+    {
+        if (!File.Exists(f))
+            return false;
+        
+        if(checkHash)
+            return sha1 is not null && HashFileSHA1(f) == sha1;
+
+        return true;
+    }
+}

Mlaumcherb.Client.Avalonia/холопы/PathHelper.cs

@@ -54,4 +54,10 @@ public static class PathHelper
     
     public static IOPath GetLog4jConfigFilePath() =>
         Path.Concat(GetAssetsDir(), GetLog4jConfigFileName());
+
+    public static IOPath GetModpackDescriptorPath(string game_version) => 
+        Path.Concat(GetVersionDir(game_version), "timerix_modpack.json");
+    
+    public static IOPath GetModpackManifestPath(string game_version) => 
+        Path.Concat(GetVersionDir(game_version), "timerix_modpack_files.json");
 }