WIP

.config/dotnet-tools.json

@@ -3,11 +3,11 @@
   "isRoot": true,
   "tools": {
     "dotnet-ef": {
-      "version": "9.0.9",
+      "version": "10.0.1",
       "commands": [
         "dotnet-ef"
       ],
       "rollForward": false
     }
   }
-}
+}

Agent/Phantom.Agent.Minecraft/Instance/InstanceProperties.cs

@@ -1,17 +1,6 @@
-using System.Collections.Immutable;
+namespace Phantom.Agent.Minecraft.Instance;
-using Phantom.Agent.Minecraft.Java;
-using Phantom.Agent.Minecraft.Properties;
-using Phantom.Common.Data.Instance;
-
-namespace Phantom.Agent.Minecraft.Instance;
 
 public sealed record InstanceProperties(
 	Guid InstanceGuid,
-	Guid JavaRuntimeGuid,
+	string InstanceFolder
-	JvmProperties JvmProperties,
-	ImmutableArray<string> JvmArguments,
-	string InstanceFolder,
-	string ServerVersion,
-	ServerProperties ServerProperties,
-	InstanceLaunchProperties LaunchProperties
 );

Agent/Phantom.Agent.Minecraft/Java/JavaPropertiesFileEditor.cs

@@ -7,6 +7,12 @@ sealed class JavaPropertiesFileEditor {
 		overriddenProperties[key] = value;
 	}
 	
+	public void SetAll(IDictionary<string, string> values) {
+		foreach ((string key, string value) in values) {
+			Set(key, value);
+		}
+	}
+	
 	public async Task EditOrCreate(string filePath, string comment, CancellationToken cancellationToken) {
 		if (File.Exists(filePath)) {
 			string tmpFilePath = filePath + ".tmp";

Agent/Phantom.Agent.Minecraft/Java/JavaRuntimeExecutable.cs

@@ -2,4 +2,4 @@
 
 namespace Phantom.Agent.Minecraft.Java;
 
-sealed record JavaRuntimeExecutable(string ExecutablePath, JavaRuntime Runtime);
+public sealed record JavaRuntimeExecutable(string ExecutablePath, JavaRuntime Runtime);

Agent/Phantom.Agent.Minecraft/Java/JavaRuntimeRepository.cs

@@ -25,7 +25,7 @@ public sealed class JavaRuntimeRepository {
 		                     .ToImmutableArray();
 	}
 	
-	internal bool TryGetByGuid(Guid guid, [MaybeNullWhen(false)] out JavaRuntimeExecutable runtime) {
+	public bool TryGetByGuid(Guid guid, [MaybeNullWhen(false)] out JavaRuntimeExecutable runtime) {
 		return runtimesByGuid.TryGetValue(guid, out runtime);
 	}
 	

Agent/Phantom.Agent.Minecraft/Launcher/BaseLauncher.cs

@@ -1,119 +0,0 @@
-using System.Collections.ObjectModel;
-using System.Text;
-using Phantom.Agent.Minecraft.Instance;
-using Phantom.Agent.Minecraft.Java;
-using Phantom.Agent.Minecraft.Server;
-using Phantom.Utils.Processes;
-using Serilog;
-
-namespace Phantom.Agent.Minecraft.Launcher;
-
-public abstract class BaseLauncher : IServerLauncher {
-	private readonly InstanceProperties instanceProperties;
-	
-	protected string MinecraftVersion => instanceProperties.ServerVersion;
-	protected string InstanceFolder => instanceProperties.InstanceFolder;
-	private protected BaseLauncher(InstanceProperties instanceProperties) {
-		this.instanceProperties = instanceProperties;
-	}
-	
-	public async Task<LaunchResult> Launch(ILogger logger, LaunchServices services, EventHandler<DownloadProgressEventArgs> downloadProgressEventHandler, CancellationToken cancellationToken) {
-		if (!services.JavaRuntimeRepository.TryGetByGuid(instanceProperties.JavaRuntimeGuid, out var javaRuntimeExecutable)) {
-			return new LaunchResult.InvalidJavaRuntime();
-		}
-		
-		var vanillaServerJarPath = await services.ServerExecutables.DownloadAndGetPath(instanceProperties.LaunchProperties.ServerDownloadInfo, MinecraftVersion, downloadProgressEventHandler, cancellationToken);
-		if (vanillaServerJarPath == null) {
-			return new LaunchResult.CouldNotDownloadMinecraftServer();
-		}
-		
-		ServerJarInfo? serverJar;
-		try {
-			serverJar = await PrepareServerJar(logger, vanillaServerJarPath, cancellationToken);
-		} catch (OperationCanceledException) {
-			throw;
-		} catch (Exception e) {
-			logger.Error(e, "Caught exception while preparing the server jar.");
-			return new LaunchResult.CouldNotPrepareMinecraftServerLauncher();
-		}
-		
-		if (!File.Exists(serverJar.FilePath)) {
-			logger.Error("Missing prepared server or launcher jar: {FilePath}", serverJar.FilePath);
-			return new LaunchResult.CouldNotPrepareMinecraftServerLauncher();
-		}
-		
-		try {
-			await AcceptEula(instanceProperties);
-			await UpdateServerProperties(instanceProperties, cancellationToken);
-		} catch (Exception e) {
-			logger.Error(e, "Caught exception while configuring the server.");
-			return new LaunchResult.CouldNotConfigureMinecraftServer();
-		}
-		
-		var processConfigurator = new ProcessConfigurator {
-			FileName = javaRuntimeExecutable.ExecutablePath,
-			WorkingDirectory = InstanceFolder,
-			RedirectInput = true,
-			UseShellExecute = false,
-		};
-		
-		var processArguments = processConfigurator.ArgumentList;
-		PrepareJvmArguments(serverJar).Build(processArguments);
-		PrepareJavaProcessArguments(processArguments, serverJar.FilePath);
-		var process = processConfigurator.CreateProcess();
-		var instanceProcess = new InstanceProcess(instanceProperties, process);
-		
-		try {
-			process.Start();
-		} catch (Exception launchException) {
-			logger.Error(launchException, "Caught exception launching the server process.");
-			
-			try {
-				process.Kill();
-			} catch (Exception killException) {
-				logger.Error(killException, "Caught exception trying to kill the server process after a failed launch.");
-			}
-			
-			return new LaunchResult.CouldNotStartMinecraftServer();
-		}
-		
-		return new LaunchResult.Success(instanceProcess);
-	}
-	
-	private JvmArgumentBuilder PrepareJvmArguments(ServerJarInfo serverJar) {
-		var builder = new JvmArgumentBuilder(instanceProperties.JvmProperties);
-		
-		foreach (string argument in instanceProperties.JvmArguments) {
-			builder.Add(argument);
-		}
-		
-		foreach (var argument in serverJar.ExtraArgs) {
-			builder.Add(argument);
-		}
-		
-		CustomizeJvmArguments(builder);
-		return builder;
-	}
-	
-	private protected virtual void CustomizeJvmArguments(JvmArgumentBuilder arguments) {}
-
-	protected virtual void PrepareJavaProcessArguments(Collection<string> processArguments, string serverJarFilePath) {
-		processArguments.Add("-jar");
-		processArguments.Add(serverJarFilePath);
-		processArguments.Add("nogui");
-	}
-	private protected virtual Task<ServerJarInfo> PrepareServerJar(ILogger logger, string serverJarPath, CancellationToken cancellationToken) {
-		return Task.FromResult(new ServerJarInfo(serverJarPath));
-	}
-	
-	private static async Task AcceptEula(InstanceProperties instanceProperties) {
-		var eulaFilePath = Path.Combine(instanceProperties.InstanceFolder, "eula.txt");
-		await File.WriteAllLinesAsync(eulaFilePath, ["# EULA", "eula=true"], Encoding.UTF8);
-	}
-	
-	private static async Task UpdateServerProperties(InstanceProperties instanceProperties, CancellationToken cancellationToken) {
-		var serverPropertiesEditor = new JavaPropertiesFileEditor();
-		instanceProperties.ServerProperties.SetTo(serverPropertiesEditor);
-		await serverPropertiesEditor.EditOrCreate(Path.Combine(instanceProperties.InstanceFolder, "server.properties"), comment: "server.properties", cancellationToken);
-	}
-}

Agent/Phantom.Agent.Minecraft/Launcher/IServerLauncher.cs

@@ -1,8 +0,0 @@
-using Phantom.Agent.Minecraft.Server;
-using Serilog;
-
-namespace Phantom.Agent.Minecraft.Launcher;
-
-public interface IServerLauncher {
-	Task<LaunchResult> Launch(ILogger logger, LaunchServices services, EventHandler<DownloadProgressEventArgs> downloadProgressEventHandler, CancellationToken cancellationToken);
-}

Agent/Phantom.Agent.Minecraft/Launcher/InstanceLauncher.cs

@@ -0,0 +1,115 @@
+using System.Collections.Immutable;
+using Phantom.Agent.Minecraft.Instance;
+using Phantom.Agent.Minecraft.Java;
+using Phantom.Agent.Minecraft.Server;
+using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
+using Phantom.Common.Data.Minecraft;
+using Phantom.Utils.Processes;
+using Serilog;
+
+namespace Phantom.Agent.Minecraft.Launcher;
+
+public sealed class InstanceLauncher(
+	FileDownloadManager downloadManager,
+	IInstancePathResolver pathResolver,
+	IInstanceValueResolver valueResolver,
+	InstanceProperties instanceProperties,
+	InstanceLaunchRecipe launchRecipe
+) {
+	public async Task<LaunchResult> Launch(ILogger logger, Action<IInstanceStatus?> reportStatus, CancellationToken cancellationToken) {
+		string? executablePath = launchRecipe.Executable.Resolve(pathResolver);
+		if (executablePath == null) {
+			logger.Error("Could not resolve server executable: {Path}", launchRecipe.Executable);
+			return new LaunchResult.CouldNotFindServerExecutable();
+		}
+		
+		var stepVisitor = new StepExecutor(downloadManager, pathResolver, reportStatus, cancellationToken);
+		var steps = launchRecipe.Preparation;
+		
+		for (int stepIndex = 0; stepIndex < steps.Length; stepIndex++) {
+			var step = steps[stepIndex];
+			try {
+				await step.Run(stepVisitor);
+			} catch (Exception e) {
+				logger.Error(e, "Failed preparation step {StepIndex} out of {StepCount}: {Step}", stepIndex, steps.Length, step);
+				return new LaunchResult.CouldNotPrepareServerInstance();
+			}
+		}
+		
+		var processConfigurator = new ProcessConfigurator {
+			FileName = executablePath,
+			WorkingDirectory = instanceProperties.InstanceFolder,
+			RedirectInput = true,
+			UseShellExecute = false,
+		};
+		
+		var processArguments = processConfigurator.ArgumentList;
+		
+		foreach (var value in launchRecipe.Arguments) {
+			if (value.Resolve(valueResolver) is {} resolved) {
+				processArguments.Add(resolved);
+			}
+			else {
+				logger.Error("Could not resolve server executable argument: {Value}", value);
+				return new LaunchResult.CouldNotPrepareServerInstance();
+			}
+		}
+		
+		var process = processConfigurator.CreateProcess();
+		var instanceProcess = new InstanceProcess(instanceProperties, process);
+		
+		try {
+			process.Start();
+		} catch (Exception launchException) {
+			logger.Error(launchException, "Caught exception launching the server process.");
+			
+			try {
+				process.Kill();
+			} catch (Exception killException) {
+				logger.Error(killException, "Caught exception trying to kill the server process after a failed launch.");
+			}
+			
+			return new LaunchResult.CouldNotStartServerExecutable();
+		}
+		
+		return new LaunchResult.Success(instanceProcess);
+	}
+	
+	private sealed class StepExecutor(FileDownloadManager downloadManager, IInstancePathResolver pathResolver, Action<IInstanceStatus?> reportStatus, CancellationToken cancellationToken) : IInstanceLaunchStepExecutor {
+		public async Task DownloadFile(FileDownloadInfo downloadInfo, IInstancePath path) {
+			string? filePath = path.Resolve(pathResolver);
+			if (filePath == null) {
+				throw new FileNotFoundException("Could not resolve path");
+			}
+			
+			byte? lastDownloadProgress = null;
+			
+			void OnDownloadProgress(object? sender, DownloadProgressEventArgs args) {
+				byte? progress = args.TotalBytes is not {} totalBytes ? null : (byte) Math.Min(args.DownloadedBytes * 100 / totalBytes, val2: 100);
+				
+				if (lastDownloadProgress != progress) {
+					lastDownloadProgress = progress;
+					reportStatus(InstanceStatus.Downloading(progress));
+				}
+			}
+			
+			if (await downloadManager.DownloadAndGetPath(downloadInfo, filePath, OnDownloadProgress, cancellationToken) == null) {
+				throw new FileNotFoundException("Could not download file");
+			}
+			
+			reportStatus(null);
+		}
+		
+		public async Task EditPropertiesFile(InstancePath.Local path, string comment, ImmutableDictionary<string, string> newValues) {
+			string? filePath = path.Resolve(pathResolver);
+			if (filePath == null) {
+				throw new FileNotFoundException("Could not resolve path");
+			}
+			
+			var editor = new JavaPropertiesFileEditor();
+			editor.SetAll(newValues);
+			await editor.EditOrCreate(filePath, comment, cancellationToken);
+		}
+	}
+}

Agent/Phantom.Agent.Minecraft/Launcher/LaunchResult.cs

@@ -7,13 +7,9 @@ public abstract record LaunchResult {
 	
 	public sealed record Success(InstanceProcess Process) : LaunchResult;
 	
-	public sealed record InvalidJavaRuntime : LaunchResult;
+	public sealed record CouldNotPrepareServerInstance : LaunchResult;
 	
-	public sealed record CouldNotDownloadMinecraftServer : LaunchResult;
+	public sealed record CouldNotFindServerExecutable : LaunchResult;
 	
-	public sealed record CouldNotPrepareMinecraftServerLauncher : LaunchResult;
+	public sealed record CouldNotStartServerExecutable : LaunchResult;
-	
-	public sealed record CouldNotConfigureMinecraftServer : LaunchResult;
-	
-	public sealed record CouldNotStartMinecraftServer : LaunchResult;
 }

Agent/Phantom.Agent.Minecraft/Launcher/LaunchServices.cs

@@ -1,6 +0,0 @@
-using Phantom.Agent.Minecraft.Java;
-using Phantom.Agent.Minecraft.Server;
-
-namespace Phantom.Agent.Minecraft.Launcher;
-
-public sealed record LaunchServices(MinecraftServerExecutables ServerExecutables, JavaRuntimeRepository JavaRuntimeRepository);

Agent/Phantom.Agent.Minecraft/Launcher/Types/FabricLauncher.cs

@@ -1,54 +0,0 @@
-using Phantom.Agent.Minecraft.Instance;
-using Phantom.Utils.IO;
-using Serilog;
-
-namespace Phantom.Agent.Minecraft.Launcher.Types;
-
-public sealed class FabricLauncher : BaseLauncher {
-	public FabricLauncher(InstanceProperties instanceProperties) : base(instanceProperties) {}
-	
-	private protected override async Task<ServerJarInfo> PrepareServerJar(ILogger logger, string serverJarPath, CancellationToken cancellationToken) {
-		var serverJarParentFolderPath = Directory.GetParent(serverJarPath);
-		if (serverJarParentFolderPath == null) {
-			throw new ArgumentException("Could not get parent folder from: " + serverJarPath, nameof(serverJarPath));
-		}
-		
-		var launcherJarPath = Path.Combine(serverJarParentFolderPath.FullName, "fabric.jar");
-		
-		if (!File.Exists(launcherJarPath)) {
-			await DownloadLauncher(logger, launcherJarPath, cancellationToken);
-		}
-		
-		return new ServerJarInfo(launcherJarPath, ["-Dfabric.installer.server.gameJar=" + Paths.NormalizeSlashes(serverJarPath)]);
-	}
-	
-	private async Task DownloadLauncher(ILogger logger, string targetFilePath, CancellationToken cancellationToken) {
-		// TODO customizable loader version, probably with a dedicated temporary folder
-		string installerUrl = $"https://meta.fabricmc.net/v2/versions/loader/{MinecraftVersion}/stable/stable/server/jar";
-		logger.Information("Downloading Fabric launcher from: {Url}", installerUrl);
-		
-		using var http = new HttpClient();
-		
-		var response = await http.GetAsync(installerUrl, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
-		response.EnsureSuccessStatusCode();
-		
-		try {
-			await using var fileStream = new FileStream(targetFilePath, FileMode.CreateNew, FileAccess.Write, FileShare.Read);
-			await using var responseStream = await response.Content.ReadAsStreamAsync(cancellationToken);
-			await responseStream.CopyToAsync(fileStream, cancellationToken);
-		} catch (Exception) {
-			TryDeleteLauncherAfterFailure(logger, targetFilePath);
-			throw;
-		}
-	}
-	
-	private static void TryDeleteLauncherAfterFailure(ILogger logger, string filePath) {
-		if (File.Exists(filePath)) {
-			try {
-				File.Delete(filePath);
-			} catch (Exception e) {
-				logger.Warning(e, "Could not clean up partially downloaded Fabric launcher: {FilePath}", filePath);
-			}
-		}
-	}
-}

Agent/Phantom.Agent.Minecraft/Launcher/Types/ForgeLauncher.cs

@@ -1,29 +0,0 @@
-using System.Collections.ObjectModel;
-using Phantom.Agent.Minecraft.Instance;
-using Phantom.Agent.Minecraft.Java;
-using Serilog;
-
-namespace Phantom.Agent.Minecraft.Launcher.Types; 
-
-public sealed class ForgeLauncher : BaseLauncher {
-	public ForgeLauncher(InstanceProperties instanceProperties) : base(instanceProperties) {}
-	
-	private protected override void CustomizeJvmArguments(JvmArgumentBuilder arguments) {
-		arguments.AddProperty("terminal.ansi", "true"); // TODO
-	}
-
-	protected override void PrepareJavaProcessArguments(Collection<string> processArguments, string serverJarFilePath) {
-		if (OperatingSystem.IsWindows()) {
-			processArguments.Add("@libraries/net/minecraftforge/forge/1.20.1-47.2.0/win_args.txt");
-		}
-		else {
-			processArguments.Add("@libraries/net/minecraftforge/forge/1.20.1-47.2.0/unix_args.txt");
-		}
-		
-		processArguments.Add("nogui");
-	}
-
-	private protected override Task<ServerJarInfo> PrepareServerJar(ILogger logger, string serverJarPath, CancellationToken cancellationToken) {
-		return Task.FromResult(new ServerJarInfo(Path.Combine(InstanceFolder, "run.sh")));
-	}
-}

Agent/Phantom.Agent.Minecraft/Launcher/Types/InvalidLauncher.cs

@@ -1,14 +0,0 @@
-using Phantom.Agent.Minecraft.Server;
-using Serilog;
-
-namespace Phantom.Agent.Minecraft.Launcher.Types;
-
-public sealed class InvalidLauncher : IServerLauncher {
-	public static InvalidLauncher Instance { get; } = new ();
-	
-	private InvalidLauncher() {}
-	
-	public Task<LaunchResult> Launch(ILogger logger, LaunchServices services, EventHandler<DownloadProgressEventArgs> downloadProgressEventHandler, CancellationToken cancellationToken) {
-		return Task.FromResult<LaunchResult>(new LaunchResult.CouldNotPrepareMinecraftServerLauncher());
-	}
-}

Agent/Phantom.Agent.Minecraft/Launcher/Types/VanillaLauncher.cs

@@ -1,7 +0,0 @@
-using Phantom.Agent.Minecraft.Instance;
-
-namespace Phantom.Agent.Minecraft.Launcher.Types;
-
-public sealed class VanillaLauncher : BaseLauncher {
-	public VanillaLauncher(InstanceProperties instanceProperties) : base(instanceProperties) {}
-}

Agent/Phantom.Agent.Minecraft/Properties/MinecraftServerProperties.cs

@@ -1,22 +0,0 @@
-namespace Phantom.Agent.Minecraft.Properties;
-
-static class MinecraftServerProperties {
-	private sealed class Boolean : MinecraftServerProperty<bool> {
-		public Boolean(string key) : base(key) {}
-		
-		protected override bool Read(string value) => value.Equals("true", StringComparison.OrdinalIgnoreCase);
-		protected override string Write(bool value) => value ? "true" : "false";
-	}
-	
-	private sealed class UnsignedShort : MinecraftServerProperty<ushort> {
-		public UnsignedShort(string key) : base(key) {}
-		
-		protected override ushort Read(string value) => ushort.Parse(value);
-		protected override string Write(ushort value) => value.ToString();
-	}
-	
-	public static readonly MinecraftServerProperty<ushort> ServerPort = new UnsignedShort("server-port");
-	public static readonly MinecraftServerProperty<ushort> RconPort = new UnsignedShort("rcon.port");
-	public static readonly MinecraftServerProperty<bool> EnableRcon = new Boolean("enable-rcon");
-	public static readonly MinecraftServerProperty<bool> SyncChunkWrites = new Boolean("sync-chunk-writes");
-}

Agent/Phantom.Agent.Minecraft/Properties/MinecraftServerProperty.cs

@@ -1,18 +0,0 @@
-using Phantom.Agent.Minecraft.Java;
-
-namespace Phantom.Agent.Minecraft.Properties;
-
-abstract class MinecraftServerProperty<T> {
-	private readonly string key;
-	
-	protected MinecraftServerProperty(string key) {
-		this.key = key;
-	}
-	
-	protected abstract T Read(string value);
-	protected abstract string Write(T value);
-	
-	public void Set(JavaPropertiesFileEditor properties, T value) {
-		properties.Set(key, Write(value));
-	}
-}

Agent/Phantom.Agent.Minecraft/Properties/ServerProperties.cs

@@ -1,17 +0,0 @@
-using Phantom.Agent.Minecraft.Java;
-
-namespace Phantom.Agent.Minecraft.Properties;
-
-public sealed record ServerProperties(
-	ushort ServerPort,
-	ushort RconPort,
-	bool EnableRcon = true,
-	bool SyncChunkWrites = false
-) {
-	internal void SetTo(JavaPropertiesFileEditor properties) {
-		MinecraftServerProperties.ServerPort.Set(properties, ServerPort);
-		MinecraftServerProperties.RconPort.Set(properties, RconPort);
-		MinecraftServerProperties.EnableRcon.Set(properties, EnableRcon);
-		MinecraftServerProperties.SyncChunkWrites.Set(properties, SyncChunkWrites);
-	}
-}

Agent/Phantom.Agent.Minecraft/Server/DownloadProgressEventArgs.cs

@@ -2,9 +2,9 @@
 
 public sealed class DownloadProgressEventArgs : EventArgs {
 	public ulong DownloadedBytes { get; }
-	public ulong TotalBytes { get; }
+	public ulong? TotalBytes { get; }
 	
-	internal DownloadProgressEventArgs(ulong downloadedBytes, ulong totalBytes) {
+	internal DownloadProgressEventArgs(ulong downloadedBytes, ulong? totalBytes) {
 		DownloadedBytes = downloadedBytes;
 		TotalBytes = totalBytes;
 	}

Agent/Phantom.Agent.Minecraft/Server/FileDownloadListener.cs

@@ -0,0 +1,3 @@
+namespace Phantom.Agent.Minecraft.Server;
+
+sealed record FileDownloadListener(EventHandler<DownloadProgressEventArgs> DownloadProgressEventHandler, CancellationToken CancellationToken);

Agent/Phantom.Agent.Minecraft/Server/FileDownloadManager.cs

@@ -0,0 +1,52 @@
+using Phantom.Common.Data.Minecraft;
+using Phantom.Utils.IO;
+using Phantom.Utils.Logging;
+using Serilog;
+
+namespace Phantom.Agent.Minecraft.Server;
+
+public sealed class FileDownloadManager {
+	private static readonly ILogger Logger = PhantomLogger.Create<FileDownloadManager>();
+	
+	private readonly Dictionary<string, FileDownloader> runningDownloadersByPath = new ();
+	
+	internal async Task<string?> DownloadAndGetPath(FileDownloadInfo fileDownloadInfo, string filePath, EventHandler<DownloadProgressEventArgs> progressEventHandler, CancellationToken cancellationToken) {
+		var fileInfo = new FileInfo(filePath);
+		if (fileInfo.Exists) {
+			return filePath;
+		}
+		
+		filePath = fileInfo.FullName;
+		
+		if (Directory.GetParent(filePath) is {} parentPath) {
+			try {
+				Directories.Create(parentPath.FullName, Chmod.URWX_GRX);
+			} catch (Exception e) {
+				Logger.Error(e, "Unable to create folder: {FolderName}", parentPath.FullName);
+				return null;
+			}
+		}
+		
+		FileDownloader? downloader;
+		FileDownloadListener listener = new (progressEventHandler, cancellationToken);
+		
+		lock (this) {
+			if (runningDownloadersByPath.TryGetValue(filePath, out downloader)) {
+				Logger.Information("A download for {Path} is already running, waiting for it to finish...", filePath);
+				downloader.Register(listener);
+			}
+			else {
+				downloader = new FileDownloader(fileDownloadInfo, filePath, listener);
+				downloader.Completed += (_, _) => {
+					lock (this) {
+						runningDownloadersByPath.Remove(filePath);
+					}
+				};
+				
+				runningDownloadersByPath[filePath] = downloader;
+			}
+		}
+		
+		return await downloader.Task.WaitAsync(cancellationToken);
+	}
+}

Agent/Phantom.Agent.Minecraft/Server/FileDownloader.cs

@@ -0,0 +1,202 @@
+using System.Security.Cryptography;
+using Phantom.Common.Data.Minecraft;
+using Phantom.Utils.Cryptography;
+using Phantom.Utils.IO;
+using Phantom.Utils.Logging;
+using Phantom.Utils.Net;
+using Phantom.Utils.Runtime;
+using Serilog;
+
+namespace Phantom.Agent.Minecraft.Server;
+
+sealed class FileDownloader {
+	private static readonly ILogger Logger = PhantomLogger.Create<FileDownloader>();
+	
+	public Task<string?> Task { get; }
+	public event EventHandler<DownloadProgressEventArgs>? DownloadProgress;
+	public event EventHandler? Completed;
+	
+	private readonly CancellationTokenSource cancellationTokenSource = new ();
+	
+	private readonly List<CancellationTokenRegistration> listenerCancellationRegistrations = [];
+	private int listenerCount = 0;
+	
+	public FileDownloader(FileDownloadInfo fileDownloadInfo, string filePath, FileDownloadListener listener) {
+		Register(listener);
+		Task = DownloadFileAndGetFinalPath(fileDownloadInfo, filePath, new DownloadProgressCallback(this), cancellationTokenSource.Token);
+		Task.ContinueWith(OnCompleted, TaskScheduler.Default);
+	}
+	
+	public void Register(FileDownloadListener listener) {
+		int newListenerCount;
+		
+		lock (this) {
+			newListenerCount = ++listenerCount;
+			
+			DownloadProgress += listener.DownloadProgressEventHandler;
+			listenerCancellationRegistrations.Add(listener.CancellationToken.Register(Unregister, listener));
+		}
+		
+		Logger.Debug("Registered download listener, current listener count: {Listeners}", newListenerCount);
+	}
+	
+	private void Unregister(object? listenerObject) {
+		int newListenerCount;
+		
+		lock (this) {
+			FileDownloadListener listener = (FileDownloadListener) listenerObject!;
+			DownloadProgress -= listener.DownloadProgressEventHandler;
+			
+			newListenerCount = --listenerCount;
+			if (newListenerCount <= 0) {
+				cancellationTokenSource.Cancel();
+			}
+		}
+		
+		if (newListenerCount <= 0) {
+			Logger.Debug("Unregistered last download listener, cancelling download.");
+		}
+		else {
+			Logger.Debug("Unregistered download listener, current listener count: {Listeners}", newListenerCount);
+		}
+	}
+	
+	private void ReportDownloadProgress(DownloadProgressEventArgs args) {
+		DownloadProgress?.Invoke(this, args);
+	}
+	
+	private void OnCompleted(Task task) {
+		Logger.Debug("Download task completed.");
+		
+		lock (this) {
+			Completed?.Invoke(this, EventArgs.Empty);
+			Completed = null;
+			DownloadProgress = null;
+			
+			foreach (var registration in listenerCancellationRegistrations) {
+				registration.Dispose();
+			}
+			
+			listenerCancellationRegistrations.Clear();
+			cancellationTokenSource.Dispose();
+		}
+	}
+	
+	private sealed class DownloadProgressCallback(FileDownloader downloader) {
+		public void ReportProgress(ulong downloadedBytes, ulong? totalBytes) {
+			downloader.ReportDownloadProgress(new DownloadProgressEventArgs(downloadedBytes, totalBytes));
+		}
+	}
+	
+	private static async Task<string?> DownloadFileAndGetFinalPath(FileDownloadInfo fileDownloadInfo, string filePath, DownloadProgressCallback progressCallback, CancellationToken cancellationToken) {
+		string tmpFilePath = filePath + ".tmp";
+		
+		try {
+			await DownloadFile(tmpFilePath, fileDownloadInfo, progressCallback, cancellationToken);
+			MoveDownloadedFile(filePath, tmpFilePath);
+		} catch (Exception) {
+			TryDeletePartiallyDownloadedFile(tmpFilePath);
+			throw;
+		}
+		
+		return filePath;
+	}
+	
+	private static async Task DownloadFile(string filePath, FileDownloadInfo fileDownloadInfo, DownloadProgressCallback progressCallback, CancellationToken cancellationToken) {
+		string downloadUrl = fileDownloadInfo.DownloadUrl;
+		
+		DownloadResult result;
+		try {
+			var httpClient = new HttpClient();
+			var response = await httpClient.GetAsync(downloadUrl, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
+			response.EnsureSuccessStatusCode();
+			
+			FileSize? fileSize = response.Headers.ContentLength;
+			ulong? fileSizeBytes = fileSize?.Bytes;
+			
+			Logger.Information("Downloading {Url} ({Size})...", downloadUrl, FormatFileSize(fileSize));
+			progressCallback.ReportProgress(downloadedBytes: 0, fileSizeBytes);
+			
+			await using var fileStream = new FileStream(filePath, FileMode.CreateNew, FileAccess.Write, FileShare.Read);
+			await using var responseStream = await response.Content.ReadAsStreamAsync(cancellationToken);
+			
+			using var streamCopier = new DownloadStreamCopier(progressCallback, fileSizeBytes);
+			result = await streamCopier.Copy(responseStream, fileStream, cancellationToken);
+		} catch (OperationCanceledException) {
+			Logger.Information("File download was cancelled: {Url}", downloadUrl);
+			throw;
+		} catch (Exception e) {
+			Logger.Error(e, "Could not download file: {Url}", downloadUrl);
+			throw StopProcedureException.Instance;
+		}
+		
+		if (fileDownloadInfo.Hash is {} expectedHash && !result.Hash.Equals(expectedHash)) {
+			Logger.Error("Downloaded file from {Url} has mismatched SHA1 hash. Expected {Expected}, got {Actual}.", downloadUrl, expectedHash, result.Hash);
+			throw StopProcedureException.Instance;
+		}
+		
+		Logger.Information("Finished downloading {Url} ({Size}).", downloadUrl, FormatFileSize(result.Size));
+	}
+	
+	private static string FormatFileSize(FileSize? fileSize) {
+		return fileSize?.ToHumanReadable(decimalPlaces: 1) ?? "unknown size";
+	}
+	
+	private static void MoveDownloadedFile(string filePath, string tmpFilePath) {
+		try {
+			File.Move(tmpFilePath, filePath, overwrite: true);
+		} catch (Exception e) {
+			Logger.Error(e, "Could not move downloaded file from {SourcePath} to {TargetPath}", tmpFilePath, filePath);
+			throw StopProcedureException.Instance;
+		}
+	}
+	
+	private static void TryDeletePartiallyDownloadedFile(string filePath) {
+		if (!File.Exists(filePath)) {
+			return;
+		}
+		
+		try {
+			File.Delete(filePath);
+		} catch (Exception e) {
+			Logger.Warning(e, "Could not clean up partially downloaded file: {FilePath}", filePath);
+		}
+	}
+	
+	private sealed class DownloadStreamCopier : IDisposable {
+		private readonly StreamCopier streamCopier = new ();
+		private readonly IncrementalHash sha1 = IncrementalHash.CreateHash(HashAlgorithmName.SHA1);
+		
+		private readonly DownloadProgressCallback progressCallback;
+		private readonly ulong? totalBytes;
+		private ulong readBytes;
+		
+		public DownloadStreamCopier(DownloadProgressCallback progressCallback, ulong? totalBytes) {
+			this.progressCallback = progressCallback;
+			this.totalBytes = totalBytes;
+			this.streamCopier.BufferReady += OnBufferReady;
+		}
+		
+		private void OnBufferReady(object? sender, StreamCopier.BufferEventArgs args) {
+			sha1.AppendData(args.Buffer.Span);
+			
+			readBytes += (uint) args.Buffer.Length;
+			progressCallback.ReportProgress(readBytes, totalBytes);
+		}
+		
+		public async Task<DownloadResult> Copy(Stream source, Stream destination, CancellationToken cancellationToken) {
+			await streamCopier.Copy(source, destination, cancellationToken);
+			
+			FileSize size = new FileSize(readBytes);
+			Sha1String hash = Sha1String.FromBytes(sha1.GetHashAndReset());
+			return new DownloadResult(size, hash);
+		}
+		
+		public void Dispose() {
+			sha1.Dispose();
+			streamCopier.Dispose();
+		}
+	}
+	
+	private readonly record struct DownloadResult(FileSize Size, Sha1String Hash);
+}

Agent/Phantom.Agent.Minecraft/Server/MinecraftServerExecutableDownloadListener.cs

@@ -1,3 +0,0 @@
-namespace Phantom.Agent.Minecraft.Server;
-
-sealed record MinecraftServerExecutableDownloadListener(EventHandler<DownloadProgressEventArgs> DownloadProgressEventHandler, CancellationToken CancellationToken);

Agent/Phantom.Agent.Minecraft/Server/MinecraftServerExecutableDownloader.cs

@@ -1,190 +0,0 @@
-using System.Security.Cryptography;
-using Phantom.Common.Data.Minecraft;
-using Phantom.Utils.Cryptography;
-using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
-using Phantom.Utils.Runtime;
-using Serilog;
-
-namespace Phantom.Agent.Minecraft.Server;
-
-sealed class MinecraftServerExecutableDownloader {
-	private static readonly ILogger Logger = PhantomLogger.Create<MinecraftServerExecutableDownloader>();
-	
-	public Task<string?> Task { get; }
-	public event EventHandler<DownloadProgressEventArgs>? DownloadProgress;
-	public event EventHandler? Completed;
-	
-	private readonly CancellationTokenSource cancellationTokenSource = new ();
-	
-	private readonly List<CancellationTokenRegistration> listenerCancellationRegistrations = [];
-	private int listenerCount = 0;
-	
-	public MinecraftServerExecutableDownloader(FileDownloadInfo fileDownloadInfo, string minecraftVersion, string filePath, MinecraftServerExecutableDownloadListener listener) {
-		Register(listener);
-		Task = DownloadAndGetPath(fileDownloadInfo, minecraftVersion, filePath, new DownloadProgressCallback(this), cancellationTokenSource.Token);
-		Task.ContinueWith(OnCompleted, TaskScheduler.Default);
-	}
-	
-	public void Register(MinecraftServerExecutableDownloadListener listener) {
-		int newListenerCount;
-		
-		lock (this) {
-			newListenerCount = ++listenerCount;
-			
-			DownloadProgress += listener.DownloadProgressEventHandler;
-			listenerCancellationRegistrations.Add(listener.CancellationToken.Register(Unregister, listener));
-		}
-		
-		Logger.Debug("Registered download listener, current listener count: {Listeners}", newListenerCount);
-	}
-	
-	private void Unregister(object? listenerObject) {
-		int newListenerCount;
-		
-		lock (this) {
-			MinecraftServerExecutableDownloadListener listener = (MinecraftServerExecutableDownloadListener) listenerObject!;
-			DownloadProgress -= listener.DownloadProgressEventHandler;
-			
-			newListenerCount = --listenerCount;
-			if (newListenerCount <= 0) {
-				cancellationTokenSource.Cancel();
-			}
-		}
-		
-		if (newListenerCount <= 0) {
-			Logger.Debug("Unregistered last download listener, cancelling download.");
-		}
-		else {
-			Logger.Debug("Unregistered download listener, current listener count: {Listeners}", newListenerCount);
-		}
-	}
-	
-	private void ReportDownloadProgress(DownloadProgressEventArgs args) {
-		DownloadProgress?.Invoke(this, args);
-	}
-	
-	private void OnCompleted(Task task) {
-		Logger.Debug("Download task completed.");
-		
-		lock (this) {
-			Completed?.Invoke(this, EventArgs.Empty);
-			Completed = null;
-			DownloadProgress = null;
-			
-			foreach (var registration in listenerCancellationRegistrations) {
-				registration.Dispose();
-			}
-			
-			listenerCancellationRegistrations.Clear();
-			cancellationTokenSource.Dispose();
-		}
-	}
-	
-	private sealed class DownloadProgressCallback {
-		private readonly MinecraftServerExecutableDownloader downloader;
-		
-		public DownloadProgressCallback(MinecraftServerExecutableDownloader downloader) {
-			this.downloader = downloader;
-		}
-		
-		public void ReportProgress(ulong downloadedBytes, ulong totalBytes) {
-			downloader.ReportDownloadProgress(new DownloadProgressEventArgs(downloadedBytes, totalBytes));
-		}
-	}
-	
-	private static async Task<string?> DownloadAndGetPath(FileDownloadInfo fileDownloadInfo, string minecraftVersion, string filePath, DownloadProgressCallback progressCallback, CancellationToken cancellationToken) {
-		string tmpFilePath = filePath + ".tmp";
-		
-		try {
-			Logger.Information("Downloading server version {Version} from: {Url} ({Size})", minecraftVersion, fileDownloadInfo.DownloadUrl, fileDownloadInfo.Size.ToHumanReadable(decimalPlaces: 1));
-			try {
-				using var http = new HttpClient();
-				await FetchServerExecutableFile(http, progressCallback, fileDownloadInfo, tmpFilePath, cancellationToken);
-			} catch (Exception) {
-				TryDeleteExecutableAfterFailure(tmpFilePath);
-				throw;
-			}
-			
-			File.Move(tmpFilePath, filePath, overwrite: true);
-			Logger.Information("Server version {Version} downloaded.", minecraftVersion);
-			
-			return filePath;
-		} catch (OperationCanceledException) {
-			Logger.Information("Download for server version {Version} was cancelled.", minecraftVersion);
-			throw;
-		} catch (StopProcedureException) {
-			return null;
-		} catch (Exception e) {
-			Logger.Error(e, "An unexpected error occurred.");
-			return null;
-		}
-	}
-	
-	private static async Task FetchServerExecutableFile(HttpClient http, DownloadProgressCallback progressCallback, FileDownloadInfo fileDownloadInfo, string filePath, CancellationToken cancellationToken) {
-		Sha1String downloadedFileHash;
-		
-		try {
-			var response = await http.GetAsync(fileDownloadInfo.DownloadUrl, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
-			response.EnsureSuccessStatusCode();
-			
-			await using var fileStream = new FileStream(filePath, FileMode.CreateNew, FileAccess.Write, FileShare.Read);
-			await using var responseStream = await response.Content.ReadAsStreamAsync(cancellationToken);
-			
-			using var streamCopier = new MinecraftServerDownloadStreamCopier(progressCallback, fileDownloadInfo.Size.Bytes);
-			downloadedFileHash = await streamCopier.Copy(responseStream, fileStream, cancellationToken);
-		} catch (OperationCanceledException) {
-			throw;
-		} catch (Exception e) {
-			Logger.Error(e, "Unable to download server executable.");
-			throw StopProcedureException.Instance;
-		}
-		
-		if (!downloadedFileHash.Equals(fileDownloadInfo.Hash)) {
-			Logger.Error("Downloaded server executable has mismatched SHA1 hash. Expected {Expected}, got {Actual}.", fileDownloadInfo.Hash, downloadedFileHash);
-			throw StopProcedureException.Instance;
-		}
-	}
-	
-	private static void TryDeleteExecutableAfterFailure(string filePath) {
-		if (File.Exists(filePath)) {
-			try {
-				File.Delete(filePath);
-			} catch (Exception e) {
-				Logger.Warning(e, "Could not clean up partially downloaded server executable: {FilePath}", filePath);
-			}
-		}
-	}
-	
-	private sealed class MinecraftServerDownloadStreamCopier : IDisposable {
-		private readonly StreamCopier streamCopier = new ();
-		private readonly IncrementalHash sha1 = IncrementalHash.CreateHash(HashAlgorithmName.SHA1);
-		
-		private readonly DownloadProgressCallback progressCallback;
-		private readonly ulong totalBytes;
-		private ulong readBytes;
-		
-		public MinecraftServerDownloadStreamCopier(DownloadProgressCallback progressCallback, ulong totalBytes) {
-			this.progressCallback = progressCallback;
-			this.totalBytes = totalBytes;
-			this.streamCopier.BufferReady += OnBufferReady;
-		}
-		
-		private void OnBufferReady(object? sender, StreamCopier.BufferEventArgs args) {
-			sha1.AppendData(args.Buffer.Span);
-			
-			readBytes += (uint) args.Buffer.Length;
-			progressCallback.ReportProgress(readBytes, totalBytes);
-		}
-		
-		public async Task<Sha1String> Copy(Stream source, Stream destination, CancellationToken cancellationToken) {
-			await streamCopier.Copy(source, destination, cancellationToken);
-			return Sha1String.FromBytes(sha1.GetHashAndReset());
-		}
-		
-		public void Dispose() {
-			sha1.Dispose();
-			streamCopier.Dispose();
-		}
-	}
-}

Agent/Phantom.Agent.Minecraft/Server/MinecraftServerExecutables.cs

@@ -1,64 +0,0 @@
-using System.Text.RegularExpressions;
-using Phantom.Common.Data.Minecraft;
-using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
-using Serilog;
-
-namespace Phantom.Agent.Minecraft.Server;
-
-public sealed partial class MinecraftServerExecutables {
-	private static readonly ILogger Logger = PhantomLogger.Create<MinecraftServerExecutables>();
-	
-	[GeneratedRegex(@"[^a-zA-Z0-9_\-\.]", RegexOptions.Compiled)]
-	private static partial Regex SanitizePathRegex();
-	
-	private readonly string basePath;
-	private readonly Dictionary<string, MinecraftServerExecutableDownloader> runningDownloadersByVersion = new ();
-	
-	public MinecraftServerExecutables(string basePath) {
-		this.basePath = basePath;
-	}
-	
-	internal async Task<string?> DownloadAndGetPath(FileDownloadInfo? fileDownloadInfo, string minecraftVersion, EventHandler<DownloadProgressEventArgs> progressEventHandler, CancellationToken cancellationToken) {
-		string serverExecutableFolderPath = Path.Combine(basePath, SanitizePathRegex().IsMatch(minecraftVersion) ? SanitizePathRegex().Replace(minecraftVersion, "_") : minecraftVersion);
-		string serverExecutableFilePath = Path.Combine(serverExecutableFolderPath, "server.jar");
-		
-		if (File.Exists(serverExecutableFilePath)) {
-			return serverExecutableFilePath;
-		}
-		
-		if (fileDownloadInfo == null) {
-			Logger.Error("Unable to download server executable for version {Version} because no download info was provided.", minecraftVersion);
-			return null;
-		}
-		
-		try {
-			Directories.Create(serverExecutableFolderPath, Chmod.URWX_GRX);
-		} catch (Exception e) {
-			Logger.Error(e, "Unable to create folder for server executable: {ServerExecutableFolderPath}", serverExecutableFolderPath);
-			return null;
-		}
-		
-		MinecraftServerExecutableDownloader? downloader;
-		MinecraftServerExecutableDownloadListener listener = new (progressEventHandler, cancellationToken);
-		
-		lock (this) {
-			if (runningDownloadersByVersion.TryGetValue(minecraftVersion, out downloader)) {
-				Logger.Information("A download for server version {Version} is already running, waiting for it to finish...", minecraftVersion);
-				downloader.Register(listener);
-			}
-			else {
-				downloader = new MinecraftServerExecutableDownloader(fileDownloadInfo, minecraftVersion, serverExecutableFilePath, listener);
-				downloader.Completed += (_, _) => {
-					lock (this) {
-						runningDownloadersByVersion.Remove(minecraftVersion);
-					}
-				};
-				
-				runningDownloadersByVersion[minecraftVersion] = downloader;
-			}
-		}
-		
-		return await downloader.Task.WaitAsync(cancellationToken);
-	}
-}

Agent/Phantom.Agent.Services/AgentFolders.cs

@@ -7,12 +7,12 @@ namespace Phantom.Agent.Services;
 public sealed class AgentFolders {
 	private static readonly ILogger Logger = PhantomLogger.Create<AgentFolders>();
 	
-	public string DataFolderPath { get; }
+	internal string DataFolderPath { get; }
-	public string InstancesFolderPath { get; }
+	internal string InstancesFolderPath { get; }
-	public string BackupsFolderPath { get; }
+	internal string BackupsFolderPath { get; }
 	
-	public string TemporaryFolderPath { get; }
+	internal string TemporaryFolderPath { get; }
-	public string ServerExecutableFolderPath { get; }
+	internal string ServerExecutableFolderPath { get; }
 	
 	public string JavaSearchFolderPath { get; }
 	

Agent/Phantom.Agent.Services/AgentRegistrationHandler.cs

@@ -33,7 +33,7 @@ public sealed class AgentRegistrationHandler {
 		foreach (var configureInstanceMessage in configureInstanceMessages) {
 			var configureInstanceResult = await agentServices.InstanceManager.Request(GetCommand(configureInstanceMessage), cancellationToken);
 			if (!configureInstanceResult.Is(ConfigureInstanceResult.Success)) {
-				logger.Fatal("Unable to configure instance \"{Name}\" (GUID {Guid}), shutting down.", configureInstanceMessage.Configuration.InstanceName, configureInstanceMessage.InstanceGuid);
+				logger.Fatal("Unable to configure instance \"{Name}\" (GUID {Guid}), shutting down.", configureInstanceMessage.Info.InstanceName, configureInstanceMessage.InstanceGuid);
 				return false;
 			}
 		}
@@ -66,7 +66,7 @@ public sealed class AgentRegistrationHandler {
 		foreach (var configureInstanceMessage in configureInstanceMessages) {
 			var configureInstanceResult = await agentServices.InstanceManager.Request(GetCommand(configureInstanceMessage), cancellationToken);
 			if (!configureInstanceResult.Is(ConfigureInstanceResult.Success)) {
-				logger.Error("Unable to configure instance \"{Name}\" (GUID {Guid}).", configureInstanceMessage.Configuration.InstanceName, configureInstanceMessage.InstanceGuid);
+				logger.Error("Unable to configure instance \"{Name}\" (GUID {Guid}).", configureInstanceMessage.Info.InstanceName, configureInstanceMessage.InstanceGuid);
 			}
 		}
 		
@@ -76,8 +76,8 @@ public sealed class AgentRegistrationHandler {
 	private static InstanceManagerActor.ConfigureInstanceCommand GetCommand(ConfigureInstanceMessage configureInstanceMessage) {
 		return new InstanceManagerActor.ConfigureInstanceCommand(
 			configureInstanceMessage.InstanceGuid,
-			configureInstanceMessage.Configuration,
+			configureInstanceMessage.Info,
-			configureInstanceMessage.LaunchProperties,
+			configureInstanceMessage.LaunchRecipe,
 			configureInstanceMessage.LaunchNow,
 			AlwaysReportStatus: true
 		);

Agent/Phantom.Agent.Services/Instances/InstanceActor.cs

@@ -82,7 +82,7 @@ sealed class InstanceActor : ReceiveActor<InstanceActor.ICommand> {
 	
 	public sealed record ReportInstanceStatusCommand : ICommand;
 	
-	public sealed record LaunchInstanceCommand(InstanceConfiguration Configuration, IServerLauncher Launcher, InstanceTicketManager.Ticket Ticket, bool IsRestarting) : ICommand;
+	public sealed record LaunchInstanceCommand(InstanceInfo Info, InstanceLauncher Launcher, InstanceTicketManager.Ticket Ticket, bool IsRestarting) : ICommand;
 	
 	public sealed record StopInstanceCommand(MinecraftStopStrategy StopStrategy) : ICommand;
 	
@@ -100,9 +100,14 @@ sealed class InstanceActor : ReceiveActor<InstanceActor.ICommand> {
 	
 	private async Task LaunchInstance(LaunchInstanceCommand command) {
 		if (command.IsRestarting || runningState is null) {
-			SetAndReportStatus(command.IsRestarting ? InstanceStatus.Restarting : InstanceStatus.Launching);
+			var defaultLaunchStatus = command.IsRestarting ? InstanceStatus.Restarting : InstanceStatus.Launching;
+			SetAndReportStatus(defaultLaunchStatus);
 			
-			var newState = await InstanceLaunchProcedure.Run(context, command.Configuration, command.Launcher, instanceTicketManager, command.Ticket, SetAndReportStatus, shutdownCancellationToken);
+			void UpdateStatus(IInstanceStatus? newStatus) {
+				SetAndReportStatus(newStatus ?? defaultLaunchStatus);
+			}
+			
+			var newState = await InstanceLaunchProcedure.Run(context, command.Info, command.Launcher, instanceTicketManager, command.Ticket, UpdateStatus, shutdownCancellationToken);
 			if (newState is null) {
 				instanceTicketManager.Release(command.Ticket);
 			}

Agent/Phantom.Agent.Services/Instances/InstanceManagerActor.cs

@@ -1,13 +1,12 @@
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Agent.Minecraft.Java;
 using Phantom.Agent.Minecraft.Launcher;
-using Phantom.Agent.Minecraft.Launcher.Types;
-using Phantom.Agent.Minecraft.Properties;
 using Phantom.Agent.Minecraft.Server;
 using Phantom.Agent.Services.Backups;
 using Phantom.Agent.Services.Rpc;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
 using Phantom.Common.Data.Minecraft;
 using Phantom.Common.Data.Replies;
 using Phantom.Utils.Actor;
@@ -27,11 +26,11 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 	}
 	
 	private readonly AgentState agentState;
-	private readonly string basePath;
+	private readonly AgentFolders agentFolders;
 	
 	private readonly InstanceServices instanceServices;
 	private readonly InstanceTicketManager instanceTicketManager;
-	private readonly Dictionary<Guid, InstanceInfo> instances = new ();
+	private readonly Dictionary<Guid, Instance> instances = new ();
 	
 	private readonly CancellationTokenSource shutdownCancellationTokenSource = new ();
 	private readonly CancellationToken shutdownCancellationToken;
@@ -40,15 +39,12 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 	
 	private InstanceManagerActor(Init init) {
 		this.agentState = init.AgentState;
-		this.basePath = init.AgentFolders.InstancesFolderPath;
+		this.agentFolders = init.AgentFolders;
+		
+		this.instanceServices = new InstanceServices(init.ControllerConnection, init.BackupManager, new FileDownloadManager(), init.JavaRuntimeRepository);
 		this.instanceTicketManager = init.InstanceTicketManager;
 		this.shutdownCancellationToken = shutdownCancellationTokenSource.Token;
 		
-		var minecraftServerExecutables = new MinecraftServerExecutables(init.AgentFolders.ServerExecutableFolderPath);
-		var launchServices = new LaunchServices(minecraftServerExecutables, init.JavaRuntimeRepository);
-		
-		this.instanceServices = new InstanceServices(init.ControllerConnection, init.BackupManager, launchServices);
-		
 		ReceiveAndReply<ConfigureInstanceCommand, Result<ConfigureInstanceResult, InstanceActionFailure>>(ConfigureInstance);
 		ReceiveAndReply<LaunchInstanceCommand, Result<LaunchInstanceResult, InstanceActionFailure>>(LaunchInstance);
 		ReceiveAndReply<StopInstanceCommand, Result<StopInstanceResult, InstanceActionFailure>>(StopInstance);
@@ -56,11 +52,11 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 		ReceiveAsync<ShutdownCommand>(Shutdown);
 	}
 	
-	private sealed record InstanceInfo(ActorRef<InstanceActor.ICommand> Actor, InstanceConfiguration Configuration, IServerLauncher Launcher);
+	private sealed record Instance(ActorRef<InstanceActor.ICommand> Actor, InstanceInfo Info, InstanceProperties Properties, InstanceLaunchRecipe? LaunchRecipe);
 	
 	public interface ICommand;
 	
-	public sealed record ConfigureInstanceCommand(Guid InstanceGuid, InstanceConfiguration Configuration, InstanceLaunchProperties LaunchProperties, bool LaunchNow, bool AlwaysReportStatus) : ICommand, ICanReply<Result<ConfigureInstanceResult, InstanceActionFailure>>;
+	public sealed record ConfigureInstanceCommand(Guid InstanceGuid, InstanceInfo Info, InstanceLaunchRecipe? LaunchRecipe, bool LaunchNow, bool AlwaysReportStatus) : ICommand, ICanReply<Result<ConfigureInstanceResult, InstanceActionFailure>>;
 	
 	public sealed record LaunchInstanceCommand(Guid InstanceGuid) : ICommand, ICanReply<Result<LaunchInstanceResult, InstanceActionFailure>>;
 	
@@ -72,42 +68,16 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 	
 	private Result<ConfigureInstanceResult, InstanceActionFailure> ConfigureInstance(ConfigureInstanceCommand command) {
 		var instanceGuid = command.InstanceGuid;
-		var configuration = command.Configuration;
+		var instanceInfo = command.Info;
-		
+		var launchRecipe = command.LaunchRecipe;
-		var instanceFolder = Path.Combine(basePath, instanceGuid.ToString());
-		Directories.Create(instanceFolder, Chmod.URWX_GRX);
-		
-		var heapMegabytes = configuration.MemoryAllocation.InMegabytes;
-		var jvmProperties = new JvmProperties(
-			InitialHeapMegabytes: heapMegabytes / 2,
-			MaximumHeapMegabytes: heapMegabytes
-		);
-		
-		var properties = new InstanceProperties(
-			instanceGuid,
-			configuration.JavaRuntimeGuid,
-			jvmProperties,
-			configuration.JvmArguments,
-			instanceFolder,
-			configuration.MinecraftVersion,
-			new ServerProperties(configuration.ServerPort, configuration.RconPort),
-			command.LaunchProperties
-		);
-		
-		IServerLauncher launcher = configuration.MinecraftServerKind switch {
-			MinecraftServerKind.Vanilla => new VanillaLauncher(properties),
-			MinecraftServerKind.Fabric  => new FabricLauncher(properties),
-			MinecraftServerKind.Forge   => new ForgeLauncher(properties),
-			_                           => InvalidLauncher.Instance,
-		};
 		
 		if (instances.TryGetValue(instanceGuid, out var instance)) {
 			instances[instanceGuid] = instance with {
-				Configuration = configuration,
+				Info = instanceInfo,
-				Launcher = launcher,
+				LaunchRecipe = launchRecipe,
 			};
 			
-			Logger.Information("Reconfigured instance \"{Name}\" (GUID {Guid}).", configuration.InstanceName, instanceGuid);
+			Logger.Information("Reconfigured instance \"{Name}\" (GUID {Guid}).", instanceInfo.InstanceName, instanceGuid);
 			
 			if (command.AlwaysReportStatus) {
 				instance.Actor.Tell(new InstanceActor.ReportInstanceStatusCommand());
@@ -115,14 +85,23 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 		}
 		else {
 			var instanceLoggerName = PhantomLogger.ShortenGuid(instanceGuid) + "/" + Interlocked.Increment(ref instanceLoggerSequenceId);
+			var instanceProperties = new InstanceProperties(instanceGuid, Path.Combine(agentFolders.InstancesFolderPath, instanceGuid.ToString()));
 			var instanceInit = new InstanceActor.Init(agentState, instanceGuid, instanceLoggerName, instanceServices, instanceTicketManager, shutdownCancellationToken);
-			instances[instanceGuid] = instance = new InstanceInfo(Context.ActorOf(InstanceActor.Factory(instanceInit), "Instance-" + instanceGuid), configuration, launcher);
+			instances[instanceGuid] = instance = new Instance(Context.ActorOf(InstanceActor.Factory(instanceInit), "Instance-" + instanceGuid), instanceInfo, instanceProperties, launchRecipe);
 			
-			Logger.Information("Created instance \"{Name}\" (GUID {Guid}).", configuration.InstanceName, instanceGuid);
+			Logger.Information("Created instance \"{Name}\" (GUID {Guid}).", instanceInfo.InstanceName, instanceGuid);
 			
 			instance.Actor.Tell(new InstanceActor.ReportInstanceStatusCommand());
 		}
 		
+		string instanceFolder = instance.Properties.InstanceFolder;
+		try {
+			Directories.Create(instanceFolder, Chmod.URWX_GRX);
+		} catch (Exception e) {
+			Logger.Error(e, "Could not create instance folder: {Path}", instanceFolder);
+			return ConfigureInstanceResult.CouldNotCreateInstanceFolder;
+		}
+		
 		if (command.LaunchNow) {
 			LaunchInstance(new LaunchInstanceCommand(instanceGuid));
 		}
@@ -132,17 +111,21 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 	
 	private Result<LaunchInstanceResult, InstanceActionFailure> LaunchInstance(LaunchInstanceCommand command) {
 		var instanceGuid = command.InstanceGuid;
-		if (!instances.TryGetValue(instanceGuid, out var instanceInfo)) {
+		if (!instances.TryGetValue(instanceGuid, out var instance)) {
 			return InstanceActionFailure.InstanceDoesNotExist;
 		}
 		
-		var ticket = instanceTicketManager.Reserve(instanceInfo.Configuration);
+		if (instance.LaunchRecipe is not {} launchRecipe) {
+			return LaunchInstanceResult.InvalidConfiguration;
+		}
+		
+		var ticket = instanceTicketManager.Reserve(instance.Info);
 		if (!ticket) {
 			return ticket.Error;
 		}
 		
-		if (agentState.InstancesByGuid.TryGetValue(instanceGuid, out var instance)) {
+		if (agentState.InstancesByGuid.TryGetValue(instanceGuid, out var agentInstance)) {
-			var status = instance.Status;
+			var status = agentInstance.Status;
 			if (status.IsRunning()) {
 				return LaunchInstanceResult.InstanceAlreadyRunning;
 			}
@@ -151,7 +134,12 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 			}
 		}
 		
-		instanceInfo.Actor.Tell(new InstanceActor.LaunchInstanceCommand(instanceInfo.Configuration, instanceInfo.Launcher, ticket.Value, IsRestarting: false));
+		var pathResolver = new InstancePathResolver(agentFolders, instanceServices.JavaRuntimeRepository, instance.Properties);
+		var valueResolver = new InstanceValueResolver(pathResolver);
+		var launcher = new InstanceLauncher(instanceServices.DownloadManager, pathResolver, valueResolver, instance.Properties, launchRecipe);
+		
+		instance.Actor.Tell(new InstanceActor.LaunchInstanceCommand(instance.Info, launcher, ticket.Value, IsRestarting: false));
+		
 		return LaunchInstanceResult.LaunchInitiated;
 	}
 	

Agent/Phantom.Agent.Services/Instances/InstancePathResolver.cs

@@ -0,0 +1,30 @@
+using System.Collections.Immutable;
+using Phantom.Agent.Minecraft.Instance;
+using Phantom.Agent.Minecraft.Java;
+using Phantom.Common.Data.Instance;
+
+namespace Phantom.Agent.Services.Instances;
+
+sealed class InstancePathResolver(AgentFolders agentFolders, JavaRuntimeRepository javaRuntimeRepository, InstanceProperties instanceProperties) : IInstancePathResolver {
+	public string Global(ImmutableArray<string> path) {
+		return CombinePath(agentFolders.ServerExecutableFolderPath, path);
+	}
+	
+	public string Local(ImmutableArray<string> path) {
+		return CombinePath(instanceProperties.InstanceFolder, path);
+	}
+	
+	public string? Runtime(Guid guid) {
+		if (javaRuntimeRepository.TryGetByGuid(guid, out var runtime)) {
+			return runtime.ExecutablePath;
+		}
+		else {
+			return null;
+		}
+	}
+	
+	private string CombinePath(string basePath, ImmutableArray<string> additionalParts) {
+		// TODO validation
+		return Path.Combine([basePath, ..additionalParts]);
+	}
+}

Agent/Phantom.Agent.Services/Instances/InstanceServices.cs

@@ -1,7 +1,13 @@
-using Phantom.Agent.Minecraft.Launcher;
+using Phantom.Agent.Minecraft.Java;
+using Phantom.Agent.Minecraft.Server;
 using Phantom.Agent.Services.Backups;
 using Phantom.Agent.Services.Rpc;
 
 namespace Phantom.Agent.Services.Instances;
 
-sealed record InstanceServices(ControllerConnection ControllerConnection, BackupManager BackupManager, LaunchServices LaunchServices);
+sealed record InstanceServices(
+	ControllerConnection ControllerConnection,
+	BackupManager BackupManager,
+	FileDownloadManager DownloadManager,
+	JavaRuntimeRepository JavaRuntimeRepository
+);

Agent/Phantom.Agent.Services/Instances/InstanceTicketManager.cs

@@ -1,4 +1,5 @@
-using Phantom.Agent.Services.Rpc;
+using System.Collections.Immutable;
+using Phantom.Agent.Services.Rpc;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Agent;
 using Phantom.Common.Data.Instance;
@@ -18,17 +19,15 @@ sealed class InstanceTicketManager(AgentInfo agentInfo, ControllerConnection con
 	private readonly HashSet<ushort> usedPorts = [];
 	private RamAllocationUnits usedMemory = new ();
 	
-	public Result<Ticket, LaunchInstanceResult> Reserve(InstanceConfiguration configuration) {
+	public Result<Ticket, LaunchInstanceResult> Reserve(InstanceInfo info) {
-		var memoryAllocation = configuration.MemoryAllocation;
+		var memoryAllocation = info.MemoryAllocation;
-		var serverPort = configuration.ServerPort;
-		var rconPort = configuration.RconPort;
 		
-		if (!agentInfo.AllowedServerPorts.Contains(serverPort)) {
+		if (!agentInfo.AllowedServerPorts.Contains(info.ServerPort)) {
 			return LaunchInstanceResult.ServerPortNotAllowed;
 		}
 		
-		if (!agentInfo.AllowedRconPorts.Contains(rconPort)) {
+		if (info.AdditionalPorts.Any(port => !agentInfo.AllowedAdditionalPorts.Contains(port))) {
-			return LaunchInstanceResult.RconPortNotAllowed;
+			return LaunchInstanceResult.AdditionalPortNotAllowed;
 		}
 		
 		lock (this) {
@@ -40,23 +39,23 @@ sealed class InstanceTicketManager(AgentInfo agentInfo, ControllerConnection con
 				return LaunchInstanceResult.MemoryLimitExceeded;
 			}
 			
-			if (usedPorts.Contains(serverPort)) {
+			if (usedPorts.Contains(info.ServerPort)) {
 				return LaunchInstanceResult.ServerPortAlreadyInUse;
 			}
 			
-			if (usedPorts.Contains(rconPort)) {
+			if (info.AdditionalPorts.Any(port => usedPorts.Contains(port))) {
-				return LaunchInstanceResult.RconPortAlreadyInUse;
+				return LaunchInstanceResult.AdditionalPortAlreadyInUse;
 			}
 			
-			var ticket = new Ticket(Guid.NewGuid(), memoryAllocation, serverPort, rconPort);
+			var ticket = new Ticket(Guid.NewGuid(), memoryAllocation, info.ServerPort, info.AdditionalPorts);
 			
 			activeTicketGuids.Add(ticket.TicketGuid);
 			usedMemory += memoryAllocation;
-			usedPorts.Add(serverPort);
+			usedPorts.Add(ticket.ServerPort);
-			usedPorts.Add(rconPort);
+			usedPorts.UnionWith(ticket.AdditionalPorts);
 			
 			RefreshAgentStatus();
-			Logger.Debug("Reserved ticket {TicketGuid} (server port {ServerPort}, rcon port {RconPort}, memory allocation {MemoryAllocation} MB).", ticket.TicketGuid, ticket.ServerPort, ticket.RconPort, ticket.MemoryAllocation.InMegabytes);
+			Logger.Debug("Reserved ticket {TicketGuid} (server port {ServerPort}, additional ports [{AdditionalPorts}], memory allocation {MemoryAllocation} MB).", ticket.TicketGuid, ticket.ServerPort, string.Join(", ", ticket.AdditionalPorts), ticket.MemoryAllocation.InMegabytes);
 			
 			return ticket;
 		}
@@ -76,10 +75,10 @@ sealed class InstanceTicketManager(AgentInfo agentInfo, ControllerConnection con
 			
 			usedMemory -= ticket.MemoryAllocation;
 			usedPorts.Remove(ticket.ServerPort);
-			usedPorts.Remove(ticket.RconPort);
+			usedPorts.ExceptWith(ticket.AdditionalPorts);
 			
 			RefreshAgentStatus();
-			Logger.Debug("Released ticket {TicketGuid} (server port {ServerPort}, rcon port {RconPort}, memory allocation {MemoryAllocation} MB).", ticket.TicketGuid, ticket.ServerPort, ticket.RconPort, ticket.MemoryAllocation.InMegabytes);
+			Logger.Debug("Released ticket {TicketGuid} (server port {ServerPort}, additional ports [{AdditionalPorts}], memory allocation {MemoryAllocation} MB).", ticket.TicketGuid, ticket.ServerPort, string.Join(", ", ticket.AdditionalPorts), ticket.MemoryAllocation.InMegabytes);
 		}
 	}
 	
@@ -93,5 +92,5 @@ sealed class InstanceTicketManager(AgentInfo agentInfo, ControllerConnection con
 		await reportStatusQueue.Shutdown(TimeSpan.FromSeconds(5));
 	}
 	
-	public sealed record Ticket(Guid TicketGuid, RamAllocationUnits MemoryAllocation, ushort ServerPort, ushort RconPort);
+	public sealed record Ticket(Guid TicketGuid, RamAllocationUnits MemoryAllocation, ushort ServerPort, ImmutableSortedSet<ushort> AdditionalPorts);
 }

Agent/Phantom.Agent.Services/Instances/InstanceValueResolver.cs

@@ -0,0 +1,13 @@
+using Phantom.Common.Data.Instance;
+
+namespace Phantom.Agent.Services.Instances;
+
+sealed class InstanceValueResolver(IInstancePathResolver pathResolver) : IInstanceValueResolver {
+	public string? Path(IInstancePath value) {
+		return value.Resolve(pathResolver);
+	}
+	
+	public string? Variable(InstanceVariable value) {
+		return null;
+	}
+}

Agent/Phantom.Agent.Services/Instances/State/InstanceLaunchProcedure.cs

@@ -1,13 +1,13 @@
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Agent.Minecraft.Launcher;
-using Phantom.Agent.Minecraft.Server;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
 
 namespace Phantom.Agent.Services.Instances.State;
 
 static class InstanceLaunchProcedure {
-	public static async Task<InstanceRunningState?> Run(InstanceContext context, InstanceConfiguration configuration, IServerLauncher launcher, InstanceTicketManager ticketManager, InstanceTicketManager.Ticket ticket, Action<IInstanceStatus> reportStatus, CancellationToken cancellationToken) {
+	public static async Task<InstanceRunningState?> Run(InstanceContext context, InstanceInfo info, InstanceLauncher launcher, InstanceTicketManager ticketManager, InstanceTicketManager.Ticket ticket, Action<IInstanceStatus?> reportStatus, CancellationToken cancellationToken) {
 		context.Logger.Information("Session starting...");
 		
 		Result<InstanceProcess, InstanceLaunchFailReason> result;
@@ -31,7 +31,7 @@ static class InstanceLaunchProcedure {
 		if (result) {
 			reportStatus(InstanceStatus.Running);
 			context.ReportEvent(InstanceEvent.LaunchSucceeded);
-			return new InstanceRunningState(context, configuration, launcher, ticket, result.Value, cancellationToken);
+			return new InstanceRunningState(context, info, launcher, ticket, result.Value, cancellationToken);
 		}
 		else {
 			reportStatus(InstanceStatus.Failed(result.Error));
@@ -40,43 +40,24 @@ static class InstanceLaunchProcedure {
 		}
 	}
 	
-	private static async Task<Result<InstanceProcess, InstanceLaunchFailReason>> LaunchInstance(InstanceContext context, IServerLauncher launcher, Action<IInstanceStatus> reportStatus, CancellationToken cancellationToken) {
+	private static async Task<Result<InstanceProcess, InstanceLaunchFailReason>> LaunchInstance(InstanceContext context, InstanceLauncher launcher, Action<IInstanceStatus?> reportStatus, CancellationToken cancellationToken) {
 		cancellationToken.ThrowIfCancellationRequested();
 		
-		byte lastDownloadProgress = byte.MaxValue;
+		switch (await launcher.Launch(context.Logger, reportStatus, cancellationToken)) {
-		
-		void OnDownloadProgress(object? sender, DownloadProgressEventArgs args) {
-			byte progress = (byte) Math.Min(args.DownloadedBytes * 100 / args.TotalBytes, val2: 100);
-			
-			if (lastDownloadProgress != progress) {
-				lastDownloadProgress = progress;
-				reportStatus(InstanceStatus.Downloading(progress));
-			}
-		}
-		
-		switch (await launcher.Launch(context.Logger, context.Services.LaunchServices, OnDownloadProgress, cancellationToken)) {
 			case LaunchResult.Success launchSuccess:
 				return launchSuccess.Process;
 			
-			case LaunchResult.InvalidJavaRuntime:
+			case LaunchResult.CouldNotPrepareServerInstance:
-				context.Logger.Error("Session failed to launch, invalid Java runtime.");
+				context.Logger.Error("Session failed to launch, could not prepare server instance.");
-				return InstanceLaunchFailReason.JavaRuntimeNotFound;
+				return InstanceLaunchFailReason.CouldNotPrepareServerInstance;
 			
-			case LaunchResult.CouldNotDownloadMinecraftServer:
+			case LaunchResult.CouldNotFindServerExecutable:
-				context.Logger.Error("Session failed to launch, could not download Minecraft server.");
+				context.Logger.Error("Session failed to launch, could not find server executable.");
-				return InstanceLaunchFailReason.CouldNotDownloadMinecraftServer;
+				return InstanceLaunchFailReason.CouldNotFindServerExecutable;
 			
-			case LaunchResult.CouldNotPrepareMinecraftServerLauncher:
+			case LaunchResult.CouldNotStartServerExecutable:
-				context.Logger.Error("Session failed to launch, could not prepare Minecraft server launcher.");
+				context.Logger.Error("Session failed to launch, could not start server executable.");
-				return InstanceLaunchFailReason.CouldNotPrepareMinecraftServerLauncher;
+				return InstanceLaunchFailReason.CouldNotStartServerExecutable;
-			
-			case LaunchResult.CouldNotConfigureMinecraftServer:
-				context.Logger.Error("Session failed to launch, could not configure Minecraft server.");
-				return InstanceLaunchFailReason.CouldNotConfigureMinecraftServer;
-			
-			case LaunchResult.CouldNotStartMinecraftServer:
-				context.Logger.Error("Session failed to launch, could not start Minecraft server.");
-				return InstanceLaunchFailReason.CouldNotStartMinecraftServer;
 			
 			default:
 				context.Logger.Error("Session failed to launch.");

Agent/Phantom.Agent.Services/Instances/State/InstanceRunningState.cs

@@ -3,6 +3,7 @@ using Phantom.Agent.Minecraft.Launcher;
 using Phantom.Agent.Services.Backups;
 using Phantom.Common.Data.Backups;
 using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
 using Phantom.Common.Data.Replies;
 
 namespace Phantom.Agent.Services.Instances.State;
@@ -14,8 +15,8 @@ sealed class InstanceRunningState : IDisposable {
 	internal bool IsStopping { get; set; }
 	
 	private readonly InstanceContext context;
-	private readonly InstanceConfiguration configuration;
+	private readonly InstanceInfo info;
-	private readonly IServerLauncher launcher;
+	private readonly InstanceLauncher launcher;
 	private readonly CancellationToken cancellationToken;
 	
 	private readonly InstanceLogSender logSender;
@@ -24,16 +25,16 @@ sealed class InstanceRunningState : IDisposable {
 	
 	private bool isDisposed;
 	
-	public InstanceRunningState(InstanceContext context, InstanceConfiguration configuration, IServerLauncher launcher, InstanceTicketManager.Ticket ticket, InstanceProcess process, CancellationToken cancellationToken) {
+	public InstanceRunningState(InstanceContext context, InstanceInfo info, InstanceLauncher launcher, InstanceTicketManager.Ticket ticket, InstanceProcess process, CancellationToken cancellationToken) {
 		this.context = context;
-		this.configuration = configuration;
+		this.info = info;
 		this.launcher = launcher;
 		this.Ticket = ticket;
 		this.Process = process;
 		this.cancellationToken = cancellationToken;
 		
 		this.logSender = new InstanceLogSender(context.Services.ControllerConnection, context.InstanceGuid, context.ShortName);
-		this.playerCountTracker = new InstancePlayerCountTracker(context, process, configuration.ServerPort);
+		this.playerCountTracker = new InstancePlayerCountTracker(context, process, info.ServerPort);
 		
 		this.backupScheduler = new BackupScheduler(context, playerCountTracker);
 		this.backupScheduler.BackupCompleted += OnScheduledBackupCompleted;
@@ -74,7 +75,7 @@ sealed class InstanceRunningState : IDisposable {
 		else {
 			context.Logger.Information("Session ended unexpectedly, restarting...");
 			context.ReportEvent(InstanceEvent.Crashed);
-			context.Actor.Tell(new InstanceActor.LaunchInstanceCommand(configuration, launcher, Ticket, IsRestarting: true));
+			context.Actor.Tell(new InstanceActor.LaunchInstanceCommand(info, launcher, Ticket, IsRestarting: true));
 		}
 	}
 	

Agent/Phantom.Agent.Services/Rpc/ControllerMessageHandlerActor.cs

@@ -26,7 +26,7 @@ public sealed class ControllerMessageHandlerActor : ReceiveActor<IMessageToAgent
 	}
 	
 	private async Task<Result<ConfigureInstanceResult, InstanceActionFailure>> HandleConfigureInstance(ConfigureInstanceMessage message) {
-		return await agent.InstanceManager.Request(new InstanceManagerActor.ConfigureInstanceCommand(message.InstanceGuid, message.Configuration, message.LaunchProperties, message.LaunchNow, AlwaysReportStatus: false));
+		return await agent.InstanceManager.Request(new InstanceManagerActor.ConfigureInstanceCommand(message.InstanceGuid, message.Info, message.LaunchRecipe, message.LaunchNow, AlwaysReportStatus: false));
 	}
 	
 	private async Task<Result<LaunchInstanceResult, InstanceActionFailure>> HandleLaunchInstance(LaunchInstanceMessage message) {

Agent/Phantom.Agent/Variables.cs

@@ -14,7 +14,7 @@ sealed record Variables(
 	ushort MaxInstances,
 	RamAllocationUnits MaxMemory,
 	AllowedPorts AllowedServerPorts,
-	AllowedPorts AllowedRconPorts,
+	AllowedPorts AllowedAdditionalPorts,
 	ushort MaxConcurrentBackupCompressionTasks
 ) {
 	private static Variables LoadOrThrow() {
@@ -30,7 +30,7 @@ sealed record Variables(
 			(ushort) EnvironmentVariables.GetInteger("MAX_INSTANCES", min: 1, max: 10000).Require,
 			EnvironmentVariables.GetString("MAX_MEMORY").MapParse(RamAllocationUnits.FromString).Require,
 			EnvironmentVariables.GetString("ALLOWED_SERVER_PORTS").MapParse(AllowedPorts.FromString).Require,
-			EnvironmentVariables.GetString("ALLOWED_RCON_PORTS").MapParse(AllowedPorts.FromString).Require,
+			EnvironmentVariables.GetString("ALLOWED_ADDITIONAL_PORTS").MapParse(AllowedPorts.FromString).Require,
 			(ushort) EnvironmentVariables.GetInteger("MAX_CONCURRENT_BACKUP_COMPRESSION_TASKS", min: 1, max: 10000).WithDefault(1)
 		);
 	}

Common/Phantom.Common.Data.Web/Agent/AgentRuntimeInfo.cs

@@ -9,9 +9,9 @@ public sealed partial record AgentRuntimeInfo(
 	[property: MemoryPackOrder(1)] ushort? MaxInstances = null,
 	[property: MemoryPackOrder(2)] RamAllocationUnits? MaxMemory = null,
 	[property: MemoryPackOrder(3)] AllowedPorts? AllowedServerPorts = null,
-	[property: MemoryPackOrder(4)] AllowedPorts? AllowedRconPorts = null
+	[property: MemoryPackOrder(4)] AllowedPorts? AllowedAdditionalPorts = null
 ) {
 	public static AgentRuntimeInfo From(AgentInfo agentInfo) {
-		return new AgentRuntimeInfo(new AgentVersionInfo(agentInfo.ProtocolVersion, agentInfo.BuildVersion), agentInfo.MaxInstances, agentInfo.MaxMemory, agentInfo.AllowedServerPorts, agentInfo.AllowedRconPorts);
+		return new AgentRuntimeInfo(new AgentVersionInfo(agentInfo.ProtocolVersion, agentInfo.BuildVersion), agentInfo.MaxInstances, agentInfo.MaxMemory, agentInfo.AllowedServerPorts, agentInfo.AllowedAdditionalPorts);
 	}
 }

Common/Phantom.Common.Data/Agent/AgentInfo.cs

@@ -9,5 +9,5 @@ public sealed partial record AgentInfo(
 	[property: MemoryPackOrder(2)] ushort MaxInstances,
 	[property: MemoryPackOrder(3)] RamAllocationUnits MaxMemory,
 	[property: MemoryPackOrder(4)] AllowedPorts AllowedServerPorts,
-	[property: MemoryPackOrder(5)] AllowedPorts AllowedRconPorts
+	[property: MemoryPackOrder(5)] AllowedPorts AllowedAdditionalPorts
 );

Common/Phantom.Common.Data/Instance/IInstanceEvent.cs

@@ -1,5 +1,6 @@
 using MemoryPack;
 using Phantom.Common.Data.Backups;
+using Phantom.Common.Data.Instance.Launch;
 
 namespace Phantom.Common.Data.Instance;
 

Common/Phantom.Common.Data/Instance/IInstancePath.cs

@@ -0,0 +1,41 @@
+using System.Collections.Immutable;
+using MemoryPack;
+
+namespace Phantom.Common.Data.Instance;
+
+[MemoryPackable]
+[MemoryPackUnion(tag: 0, typeof(InstancePath.Global))]
+[MemoryPackUnion(tag: 1, typeof(InstancePath.Local))]
+[MemoryPackUnion(tag: 2, typeof(InstancePath.Runtime))]
+public partial interface IInstancePath {
+	string? Resolve(IInstancePathResolver resolver);
+}
+
+public static partial class InstancePath {
+	[MemoryPackable(GenerateType.VersionTolerant)]
+	public sealed partial record Global(
+		[property: MemoryPackOrder(0)] ImmutableArray<string> Path
+	) : IInstancePath {
+		public string? Resolve(IInstancePathResolver resolver) {
+			return resolver.Global(Path);
+		}
+	}
+	
+	[MemoryPackable(GenerateType.VersionTolerant)]
+	public sealed partial record Local(
+		[property: MemoryPackOrder(0)] ImmutableArray<string> Path
+	) : IInstancePath {
+		public string? Resolve(IInstancePathResolver resolver) {
+			return resolver.Local(Path);
+		}
+	}
+	
+	[MemoryPackable(GenerateType.VersionTolerant)]
+	public sealed partial record Runtime(
+		[property: MemoryPackOrder(0)] Guid Guid
+	) : IInstancePath {
+		public string? Resolve(IInstancePathResolver resolver) {
+			return resolver.Runtime(Guid);
+		}
+	}
+}

Common/Phantom.Common.Data/Instance/IInstancePathResolver.cs

@@ -0,0 +1,9 @@
+using System.Collections.Immutable;
+
+namespace Phantom.Common.Data.Instance;
+
+public interface IInstancePathResolver {
+	string? Global(ImmutableArray<string> path);
+	string? Local(ImmutableArray<string> path);
+	string? Runtime(Guid guid);
+}

Common/Phantom.Common.Data/Instance/IInstanceStatus.cs

@@ -1,4 +1,5 @@
 using MemoryPack;
+using Phantom.Common.Data.Instance.Launch;
 
 namespace Phantom.Common.Data.Instance;
 
@@ -25,7 +26,7 @@ public sealed partial record InstanceIsInvalid([property: MemoryPackOrder(0)] st
 public sealed partial record InstanceIsNotRunning : IInstanceStatus;
 
 [MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record InstanceIsDownloading([property: MemoryPackOrder(0)] byte Progress) : IInstanceStatus;
+public sealed partial record InstanceIsDownloading([property: MemoryPackOrder(0)] byte? Progress) : IInstanceStatus;
 
 [MemoryPackable(GenerateType.VersionTolerant)]
 public sealed partial record InstanceIsLaunching : IInstanceStatus;
@@ -55,7 +56,7 @@ public static class InstanceStatus {
 	public static readonly IInstanceStatus Stopping = new InstanceIsStopping();
 	
 	public static IInstanceStatus Invalid(string reason) => new InstanceIsInvalid(reason);
-	public static IInstanceStatus Downloading(byte progress) => new InstanceIsDownloading(progress);
+	public static IInstanceStatus Downloading(byte? progress) => new InstanceIsDownloading(progress);
 	public static IInstanceStatus Failed(InstanceLaunchFailReason reason) => new InstanceIsFailed(reason);
 	
 	public static bool IsLaunching(this IInstanceStatus status) {

Common/Phantom.Common.Data/Instance/IInstanceValue.cs

@@ -0,0 +1,57 @@
+using System.Collections.Immutable;
+using System.Text;
+using MemoryPack;
+
+namespace Phantom.Common.Data.Instance;
+
+[MemoryPackable]
+[MemoryPackUnion(tag: 0, typeof(InstanceValues.Concatenation))]
+[MemoryPackUnion(tag: 1, typeof(InstanceValues.Text))]
+[MemoryPackUnion(tag: 2, typeof(InstanceValues.Path))]
+[MemoryPackUnion(tag: 3, typeof(InstanceValues.Variable))]
+public partial interface IInstanceValue {
+	string? Resolve(IInstanceValueResolver resolver);
+}
+
+public static partial class InstanceValues {
+	[MemoryPackable]
+	public sealed partial record Concatenation(ImmutableArray<IInstanceValue> Values) : IInstanceValue {
+		public string? Resolve(IInstanceValueResolver resolver) {
+			var result = new StringBuilder();
+			
+			foreach (IInstanceValue value in Values) {
+				if (value.Resolve(resolver) is {} resolved) {
+					result.Append(resolved);
+				}
+				else {
+					return null;
+				}
+			}
+			
+			return result.ToString();
+		}
+	}
+	
+	[MemoryPackable]
+	public sealed partial record Text(string Value) : IInstanceValue {
+		public string Resolve(IInstanceValueResolver resolver) {
+			return Value;
+		}
+	}
+	
+	[MemoryPackable]
+	public sealed partial record Path(IInstancePath Value) : IInstanceValue {
+		public string? Resolve(IInstanceValueResolver resolver) {
+			return resolver.Path(Value);
+		}
+	}
+	
+	[MemoryPackable]
+	public sealed partial record Variable(InstanceVariable Value) : IInstanceValue {
+		public string? Resolve(IInstanceValueResolver resolver) {
+			return resolver.Variable(Value);
+		}
+	}
+}
+
+public enum InstanceVariable {}

Common/Phantom.Common.Data/Instance/IInstanceValueResolver.cs

@@ -0,0 +1,6 @@
+namespace Phantom.Common.Data.Instance;
+
+public interface IInstanceValueResolver {
+	string? Path(IInstancePath value);
+	string? Variable(InstanceVariable value);
+}

Common/Phantom.Common.Data/Instance/InstanceConfiguration.cs

@@ -15,4 +15,7 @@ public sealed partial record InstanceConfiguration(
 	[property: MemoryPackOrder(6)] RamAllocationUnits MemoryAllocation,
 	[property: MemoryPackOrder(7)] Guid JavaRuntimeGuid,
 	[property: MemoryPackOrder(8)] ImmutableArray<string> JvmArguments
-);
+) {
+	[MemoryPackIgnore]
+	public InstanceInfo AsInfo => new (InstanceName, ServerPort, [RconPort], MemoryAllocation);
+}

Common/Phantom.Common.Data/Instance/InstanceInfo.cs

@@ -0,0 +1,12 @@
+using System.Collections.Immutable;
+using MemoryPack;
+
+namespace Phantom.Common.Data.Instance;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+public sealed partial record InstanceInfo(
+	[property: MemoryPackOrder(0)] string InstanceName,
+	[property: MemoryPackOrder(1)] ushort ServerPort,
+	[property: MemoryPackOrder(2)] ImmutableSortedSet<ushort> AdditionalPorts,
+	[property: MemoryPackOrder(3)] RamAllocationUnits MemoryAllocation
+);

Common/Phantom.Common.Data/Instance/InstanceLaunchFailReason.cs

@@ -1,10 +0,0 @@
-namespace Phantom.Common.Data.Instance;
-
-public enum InstanceLaunchFailReason : byte {
-	UnknownError                           = 0,
-	JavaRuntimeNotFound                    = 5,
-	CouldNotDownloadMinecraftServer        = 6,
-	CouldNotConfigureMinecraftServer       = 7,
-	CouldNotPrepareMinecraftServerLauncher = 8,
-	CouldNotStartMinecraftServer           = 9,
-}

Common/Phantom.Common.Data/Instance/InstanceLaunchProperties.cs

@@ -1,9 +0,0 @@
-using MemoryPack;
-using Phantom.Common.Data.Minecraft;
-
-namespace Phantom.Common.Data.Instance;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record InstanceLaunchProperties(
-	[property: MemoryPackOrder(0)] FileDownloadInfo? ServerDownloadInfo
-);

Common/Phantom.Common.Data/Instance/Launch/IInstanceLaunchStep.cs

@@ -0,0 +1,35 @@
+using System.Collections.Immutable;
+using MemoryPack;
+using Phantom.Common.Data.Minecraft;
+
+namespace Phantom.Common.Data.Instance.Launch;
+
+[MemoryPackable]
+[MemoryPackUnion(tag: 0, typeof(InstanceLaunchStep.DownloadFile))]
+[MemoryPackUnion(tag: 1, typeof(InstanceLaunchStep.EditPropertiesFile))]
+public partial interface IInstanceLaunchStep {
+	Task Run(IInstanceLaunchStepExecutor executor);
+}
+
+public static partial class InstanceLaunchStep {
+	[MemoryPackable(GenerateType.VersionTolerant)]
+	public sealed partial record DownloadFile(
+		[property: MemoryPackOrder(0)] FileDownloadInfo DownloadInfo,
+		[property: MemoryPackOrder(1)] IInstancePath Path
+	) : IInstanceLaunchStep {
+		public Task Run(IInstanceLaunchStepExecutor executor) {
+			return executor.DownloadFile(DownloadInfo, Path);
+		}
+	}
+	
+	[MemoryPackable(GenerateType.VersionTolerant)]
+	public sealed partial record EditPropertiesFile(
+		[property: MemoryPackOrder(0)] InstancePath.Local Path,
+		[property: MemoryPackOrder(1)] string Comment,
+		[property: MemoryPackOrder(2)] ImmutableDictionary<string, string> NewValues
+	) : IInstanceLaunchStep {
+		public Task Run(IInstanceLaunchStepExecutor executor) {
+			return executor.EditPropertiesFile(Path, Comment, NewValues);
+		}
+	}
+}

Common/Phantom.Common.Data/Instance/Launch/IInstanceLaunchStepExecutor.cs

@@ -0,0 +1,9 @@
+using System.Collections.Immutable;
+using Phantom.Common.Data.Minecraft;
+
+namespace Phantom.Common.Data.Instance.Launch;
+
+public interface IInstanceLaunchStepExecutor {
+	Task DownloadFile(FileDownloadInfo downloadInfo, IInstancePath path);
+	Task EditPropertiesFile(InstancePath.Local path, string comment, ImmutableDictionary<string, string> newValues);
+}

Common/Phantom.Common.Data/Instance/Launch/InstanceLaunchFailReason.cs

@@ -0,0 +1,8 @@
+namespace Phantom.Common.Data.Instance.Launch;
+
+public enum InstanceLaunchFailReason : byte {
+	UnknownError                  = 0,
+	CouldNotPrepareServerInstance = 1,
+	CouldNotFindServerExecutable  = 2,
+	CouldNotStartServerExecutable = 3,
+}

Common/Phantom.Common.Data/Instance/Launch/InstanceLaunchRecipe.cs

@@ -0,0 +1,11 @@
+using System.Collections.Immutable;
+using MemoryPack;
+
+namespace Phantom.Common.Data.Instance.Launch;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+public sealed partial record InstanceLaunchRecipe(
+	[property: MemoryPackOrder(0)] ImmutableArray<IInstanceLaunchStep> Preparation,
+	[property: MemoryPackOrder(1)] IInstancePath Executable,
+	[property: MemoryPackOrder(2)] ImmutableArray<IInstanceValue> Arguments
+);

Common/Phantom.Common.Data/Minecraft/FileDownloadInfo.cs

@@ -1,6 +1,5 @@
 using MemoryPack;
 using Phantom.Utils.Cryptography;
-using Phantom.Utils.IO;
 
 namespace Phantom.Common.Data.Minecraft;
 
@@ -11,20 +10,16 @@ public sealed partial class FileDownloadInfo {
 	
 	[MemoryPackOrder(1)]
 	[MemoryPackInclude]
-	private readonly string hash;
+	private readonly string? hash;
 	
 	[MemoryPackIgnore]
-	public Sha1String Hash => Sha1String.FromString(hash);
+	public Sha1String? Hash => hash == null ? null : Sha1String.FromString(hash);
 	
-	[MemoryPackOrder(2)]
+	public FileDownloadInfo(string downloadUrl, Sha1String? hash = null) : this(downloadUrl, hash?.ToString()) {}
-	public FileSize Size { get; }
-	
-	public FileDownloadInfo(string downloadUrl, Sha1String hash, FileSize size) : this(downloadUrl, hash.ToString(), size) {}
 	
 	[MemoryPackConstructor]
-	private FileDownloadInfo(string downloadUrl, string hash, FileSize size) {
+	private FileDownloadInfo(string downloadUrl, string? hash) {
 		this.DownloadUrl = downloadUrl;
 		this.hash = hash;
-		this.Size = size;
 	}
 }

Common/Phantom.Common.Data/Minecraft/MinecraftServerKind.cs

@@ -3,5 +3,4 @@
 public enum MinecraftServerKind : ushort {
 	Vanilla = 1,
 	Fabric = 2,
-	Forge = 3,
 }

Common/Phantom.Common.Data/Replies/ConfigureInstanceResult.cs

@@ -1,14 +1,16 @@
 namespace Phantom.Common.Data.Replies;
 
 public enum ConfigureInstanceResult : byte {
-	Success,
+	Success                      = 0,
+	CouldNotCreateInstanceFolder = 1,
 }
 
 public static class ConfigureInstanceResultExtensions {
 	public static string ToSentence(this ConfigureInstanceResult reason) {
 		return reason switch {
-			ConfigureInstanceResult.Success => "Success.",
+			ConfigureInstanceResult.Success                      => "Success.",
-			_                               => "Unknown error.",
+			ConfigureInstanceResult.CouldNotCreateInstanceFolder => "Could not create instance folder.",
+			_                                                    => "Unknown error.",
 		};
 	}
 }

Common/Phantom.Common.Data/Replies/LaunchInstanceResult.cs

@@ -1,13 +1,14 @@
 namespace Phantom.Common.Data.Replies;
 
 public enum LaunchInstanceResult : byte {
-	LaunchInitiated          = 1,
+	LaunchInitiated            = 1,
-	InstanceAlreadyLaunching = 2,
+	InstanceAlreadyLaunching   = 2,
-	InstanceAlreadyRunning   = 3,
+	InstanceAlreadyRunning     = 3,
-	InstanceLimitExceeded    = 4,
+	InstanceLimitExceeded      = 4,
-	MemoryLimitExceeded      = 5,
+	MemoryLimitExceeded        = 5,
-	ServerPortNotAllowed     = 6,
+	ServerPortNotAllowed       = 6,
-	ServerPortAlreadyInUse   = 7,
+	ServerPortAlreadyInUse     = 7,
-	RconPortNotAllowed       = 8,
+	AdditionalPortNotAllowed   = 8,
-	RconPortAlreadyInUse     = 9,
+	AdditionalPortAlreadyInUse = 9,
+	InvalidConfiguration       = 10,
 }

Common/Phantom.Common.Messages.Agent/ToAgent/ConfigureInstanceMessage.cs

@@ -1,6 +1,7 @@
 using MemoryPack;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
 using Phantom.Common.Data.Replies;
 using Phantom.Utils.Actor;
 
@@ -9,7 +10,7 @@ namespace Phantom.Common.Messages.Agent.ToAgent;
 [MemoryPackable(GenerateType.VersionTolerant)]
 public sealed partial record ConfigureInstanceMessage(
 	[property: MemoryPackOrder(0)] Guid InstanceGuid,
-	[property: MemoryPackOrder(1)] InstanceConfiguration Configuration,
+	[property: MemoryPackOrder(1)] InstanceInfo Info,
-	[property: MemoryPackOrder(2)] InstanceLaunchProperties LaunchProperties,
+	[property: MemoryPackOrder(2)] InstanceLaunchRecipe? LaunchRecipe,
 	[property: MemoryPackOrder(3)] bool LaunchNow = false
 ) : IMessageToAgent, ICanReply<Result<ConfigureInstanceResult, InstanceActionFailure>>;

Controller/Phantom.Controller.Database.Postgres/Migrations/20251228211902_AgentAuthSecretNullability.Designer.cs

@@ -0,0 +1,357 @@
+// <auto-generated />
+using System;
+using System.Text.Json;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using Phantom.Controller.Database;
+
+#nullable disable
+
+namespace Phantom.Controller.Database.Postgres.Migrations
+{
+    [DbContext(typeof(ApplicationDbContext))]
+    [Migration("20251228211902_AgentAuthSecretNullability")]
+    partial class AgentAuthSecretNullability
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "9.0.9")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.AgentEntity", b =>
+                {
+                    b.Property<Guid>("AgentGuid")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<byte[]>("AuthSecret")
+                        .IsRequired()
+                        .HasMaxLength(12)
+                        .HasColumnType("bytea");
+
+                    b.Property<string>("BuildVersion")
+                        .HasColumnType("text");
+
+                    b.Property<int?>("MaxInstances")
+                        .HasColumnType("integer");
+
+                    b.Property<int?>("MaxMemory")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int?>("ProtocolVersion")
+                        .HasColumnType("integer");
+
+                    b.HasKey("AgentGuid");
+
+                    b.ToTable("Agents", "agents");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.AuditLogEntity", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
+
+                    b.Property<JsonDocument>("Data")
+                        .HasColumnType("jsonb");
+
+                    b.Property<string>("EventType")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("SubjectId")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("SubjectType")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("UserGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<DateTime>("UtcTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("UserGuid");
+
+                    b.ToTable("AuditLog", "system");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.EventLogEntity", b =>
+                {
+                    b.Property<Guid>("EventGuid")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("AgentGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<JsonDocument>("Data")
+                        .HasColumnType("jsonb");
+
+                    b.Property<string>("EventType")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("SubjectId")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("SubjectType")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<DateTime>("UtcTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("EventGuid");
+
+                    b.ToTable("EventLog", "system");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.InstanceEntity", b =>
+                {
+                    b.Property<Guid>("InstanceGuid")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("AgentGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("InstanceName")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<Guid>("JavaRuntimeGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("JvmArguments")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<bool>("LaunchAutomatically")
+                        .HasColumnType("boolean");
+
+                    b.Property<int>("MemoryAllocation")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("MinecraftServerKind")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("MinecraftVersion")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<int>("RconPort")
+                        .HasColumnType("integer");
+
+                    b.Property<int>("ServerPort")
+                        .HasColumnType("integer");
+
+                    b.HasKey("InstanceGuid");
+
+                    b.ToTable("Instances", "agents");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.PermissionEntity", b =>
+                {
+                    b.Property<string>("Id")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Permissions", "identity");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.RoleEntity", b =>
+                {
+                    b.Property<Guid>("RoleGuid")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("RoleGuid");
+
+                    b.ToTable("Roles", "identity");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.RolePermissionEntity", b =>
+                {
+                    b.Property<Guid>("RoleGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("PermissionId")
+                        .HasColumnType("text");
+
+                    b.HasKey("RoleGuid", "PermissionId");
+
+                    b.HasIndex("PermissionId");
+
+                    b.ToTable("RolePermissions", "identity");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.UserAgentAccessEntity", b =>
+                {
+                    b.Property<Guid>("UserGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("AgentGuid")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("UserGuid", "AgentGuid");
+
+                    b.HasIndex("AgentGuid");
+
+                    b.ToTable("UserAgentAccess", "identity");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.UserEntity", b =>
+                {
+                    b.Property<Guid>("UserGuid")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.Property<string>("PasswordHash")
+                        .IsRequired()
+                        .HasColumnType("text");
+
+                    b.HasKey("UserGuid");
+
+                    b.HasIndex("Name")
+                        .IsUnique();
+
+                    b.ToTable("Users", "identity");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.UserPermissionEntity", b =>
+                {
+                    b.Property<Guid>("UserGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("PermissionId")
+                        .HasColumnType("text");
+
+                    b.HasKey("UserGuid", "PermissionId");
+
+                    b.HasIndex("PermissionId");
+
+                    b.ToTable("UserPermissions", "identity");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.UserRoleEntity", b =>
+                {
+                    b.Property<Guid>("UserGuid")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid>("RoleGuid")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("UserGuid", "RoleGuid");
+
+                    b.HasIndex("RoleGuid");
+
+                    b.ToTable("UserRoles", "identity");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.AuditLogEntity", b =>
+                {
+                    b.HasOne("Phantom.Controller.Database.Entities.UserEntity", "User")
+                        .WithMany()
+                        .HasForeignKey("UserGuid")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.RolePermissionEntity", b =>
+                {
+                    b.HasOne("Phantom.Controller.Database.Entities.PermissionEntity", null)
+                        .WithMany()
+                        .HasForeignKey("PermissionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Phantom.Controller.Database.Entities.RoleEntity", null)
+                        .WithMany()
+                        .HasForeignKey("RoleGuid")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.UserAgentAccessEntity", b =>
+                {
+                    b.HasOne("Phantom.Controller.Database.Entities.AgentEntity", null)
+                        .WithMany()
+                        .HasForeignKey("AgentGuid")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Phantom.Controller.Database.Entities.UserEntity", null)
+                        .WithMany()
+                        .HasForeignKey("UserGuid")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.UserPermissionEntity", b =>
+                {
+                    b.HasOne("Phantom.Controller.Database.Entities.PermissionEntity", null)
+                        .WithMany()
+                        .HasForeignKey("PermissionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Phantom.Controller.Database.Entities.UserEntity", null)
+                        .WithMany()
+                        .HasForeignKey("UserGuid")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+                });
+
+            modelBuilder.Entity("Phantom.Controller.Database.Entities.UserRoleEntity", b =>
+                {
+                    b.HasOne("Phantom.Controller.Database.Entities.RoleEntity", "Role")
+                        .WithMany()
+                        .HasForeignKey("RoleGuid")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Phantom.Controller.Database.Entities.UserEntity", "User")
+                        .WithMany()
+                        .HasForeignKey("UserGuid")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Role");
+
+                    b.Navigation("User");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Controller/Phantom.Controller.Database.Postgres/Migrations/20251228211902_AgentAuthSecretNullability.cs

@@ -0,0 +1,42 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Phantom.Controller.Database.Postgres.Migrations
+{
+    /// <inheritdoc />
+    public partial class AgentAuthSecretNullability : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<byte[]>(
+                name: "AuthSecret",
+                schema: "agents",
+                table: "Agents",
+                type: "bytea",
+                maxLength: 12,
+                nullable: false,
+                defaultValue: new byte[0],
+                oldClrType: typeof(byte[]),
+                oldType: "bytea",
+                oldMaxLength: 12,
+                oldNullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<byte[]>(
+                name: "AuthSecret",
+                schema: "agents",
+                table: "Agents",
+                type: "bytea",
+                maxLength: 12,
+                nullable: true,
+                oldClrType: typeof(byte[]),
+                oldType: "bytea",
+                oldMaxLength: 12);
+        }
+    }
+}

Controller/Phantom.Controller.Database.Postgres/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -30,6 +30,7 @@ namespace Phantom.Controller.Database.Postgres.Migrations
                         .HasColumnType("uuid");
 
                     b.Property<byte[]>("AuthSecret")
+                        .IsRequired()
                         .HasMaxLength(12)
                         .HasColumnType("bytea");
 

Controller/Phantom.Controller.Database/Entities/AgentEntity.cs

@@ -20,7 +20,7 @@ public sealed class AgentEntity {
 	public RamAllocationUnits? MaxMemory { get; set; }
 	
 	[MaxLength(AuthSecret.Length)]
-	public AuthSecret? AuthSecret { get; set; }
+	public AuthSecret AuthSecret { get; set; }
 	
 	public AgentConfiguration Configuration => new (Name);
 	public AgentVersionInfo? VersionInfo => ProtocolVersion is {} protocolVersion && BuildVersion is {} buildVersion ? new AgentVersionInfo(protocolVersion, buildVersion) : null;
@@ -30,5 +30,6 @@ public sealed class AgentEntity {
 		AgentGuid = agentGuid;
 		Name = null!;
 		BuildVersion = null!;
+		AuthSecret = null!;
 	}
 }

Controller/Phantom.Controller.Database/Phantom.Controller.Database.csproj

@@ -11,7 +11,6 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="System.Linq.Async" />
   </ItemGroup>
   
   <ItemGroup>

Controller/Phantom.Controller.Minecraft/MinecraftLaunchRecipes.cs

@@ -0,0 +1,77 @@
+using System.Collections.Immutable;
+using System.Text.RegularExpressions;
+using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
+using Phantom.Common.Data.Minecraft;
+using Phantom.Utils.Collections;
+
+namespace Phantom.Controller.Minecraft;
+
+public sealed partial class MinecraftLaunchRecipes(MinecraftVersions minecraftVersions) {
+	[GeneratedRegex(@"[^a-zA-Z0-9_\-\.]", RegexOptions.Compiled)]
+	private static partial Regex SanitizePathRegex();
+	
+	private static readonly ImmutableDictionary<string, string> Eula = ImmutableDictionary.From([
+		("eula", "true"),
+	]);
+	
+	public async Task<InstanceLaunchRecipe?> Create(InstanceConfiguration configuration, CancellationToken cancellationToken) {
+		string minecraftVersion = configuration.MinecraftVersion;
+		string minecraftVersionPath = SanitizePathRegex().IsMatch(minecraftVersion) ? SanitizePathRegex().Replace(minecraftVersion, "_") : minecraftVersion;
+		
+		uint maximumHeapSizeMegabvtes = configuration.MemoryAllocation.InMegabytes;
+		uint initialHeapSizeMegabytes = maximumHeapSizeMegabvtes / 2;
+		
+		var serverExecutableInfo = await minecraftVersions.GetServerExecutableInfo(minecraftVersion, cancellationToken);
+		if (serverExecutableInfo == null) {
+			// TODO
+			return null;
+		}
+		
+		var vanillaJarFilePath = new InstancePath.Global(["minecraft", "vanilla", minecraftVersionPath, "server.jar"]);
+		
+		var steps = ImmutableArray.CreateBuilder<IInstanceLaunchStep>();
+		
+		steps.Add(new InstanceLaunchStep.DownloadFile(serverExecutableInfo, vanillaJarFilePath));
+		steps.Add(new InstanceLaunchStep.EditPropertiesFile(new InstancePath.Local(["eula.txt"]), "EULA", Eula));
+		steps.Add(new InstanceLaunchStep.EditPropertiesFile(new InstancePath.Local(["server.properties"]), "Server Properties", ServerProperties(configuration)));
+		
+		var serverExecutableFilePath = vanillaJarFilePath;
+		var additionalJvmArguments = new List<IInstanceValue>();
+		
+		if (configuration.MinecraftServerKind == MinecraftServerKind.Fabric) {
+			// TODO customizable loader version
+			string fabricLauncherUrl = $"https://meta.fabricmc.net/v2/versions/loader/{minecraftVersion}/stable/stable/server/jar";
+			
+			var fabricLauncherFilePath = new InstancePath.Global(["minecraft", "fabric", minecraftVersionPath, "loader.jar"]);
+			
+			steps.Add(new InstanceLaunchStep.DownloadFile(new FileDownloadInfo(fabricLauncherUrl), fabricLauncherFilePath));
+			
+			serverExecutableFilePath = fabricLauncherFilePath;
+			
+			additionalJvmArguments.Add(new InstanceValues.Concatenation([
+				new InstanceValues.Text("-Dfabric.installer.server.gameJar="),
+				new InstanceValues.Path(vanillaJarFilePath),
+			]));
+		}
+		
+		return new InstanceLaunchRecipe(steps.ToImmutable(), new InstancePath.Runtime(configuration.JavaRuntimeGuid), [
+			..configuration.JvmArguments.Select(static arg => new InstanceValues.Text(arg)),
+			..additionalJvmArguments,
+			new InstanceValues.Text("-Xms" + initialHeapSizeMegabytes + "M"),
+			new InstanceValues.Text("-Xmx" + maximumHeapSizeMegabvtes + "M"),
+			new InstanceValues.Text("-jar"),
+			new InstanceValues.Path(serverExecutableFilePath),
+			new InstanceValues.Text("-nogui"),
+		]);
+	}
+	
+	private static ImmutableDictionary<string, string> ServerProperties(InstanceConfiguration configuration) {
+		return ImmutableDictionary.From([
+			("server-port", configuration.ServerPort.ToString()),
+			("rcon.port", configuration.RconPort.ToString()),
+			("enable-rcon", "true"),
+			("sync-chunk-writes", "false"),
+		]);
+	}
+}

Controller/Phantom.Controller.Minecraft/MinecraftVersionApi.cs

@@ -3,7 +3,6 @@ using System.Net.Http.Json;
 using System.Text.Json;
 using Phantom.Common.Data.Minecraft;
 using Phantom.Utils.Cryptography;
-using Phantom.Utils.IO;
 using Phantom.Utils.Logging;
 using Phantom.Utils.Runtime;
 using Serilog;
@@ -127,15 +126,6 @@ sealed class MinecraftVersionApi : IDisposable {
 			throw StopProcedureException.Instance;
 		}
 		
-		JsonElement sizeElement = GetJsonPropertyOrThrow(serverElement, "size", JsonValueKind.Number, "downloads.server object in version metadata");
-		ulong size;
-		try {
-			size = sizeElement.GetUInt64();
-		} catch (FormatException) {
-			Logger.Error("The \"size\" key in downloads.server object in version metadata contains an invalid file size: {Size}", sizeElement);
-			throw StopProcedureException.Instance;
-		}
-		
 		JsonElement sha1Element = GetJsonPropertyOrThrow(serverElement, "sha1", JsonValueKind.String, "downloads.server object in version metadata");
 		Sha1String hash;
 		try {
@@ -145,7 +135,7 @@ sealed class MinecraftVersionApi : IDisposable {
 			throw StopProcedureException.Instance;
 		}
 		
-		return new FileDownloadInfo(url, hash, new FileSize(size));
+		return new FileDownloadInfo(url, hash);
 	}
 	
 	private static JsonElement GetJsonPropertyOrThrow(JsonElement parentElement, string propertyKey, JsonValueKind expectedKind, string location) {

Controller/Phantom.Controller.Services/Agents/AgentActor.cs

@@ -4,6 +4,7 @@ using Microsoft.EntityFrameworkCore;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Agent;
 using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
 using Phantom.Common.Data.Java;
 using Phantom.Common.Data.Minecraft;
 using Phantom.Common.Data.Replies;
@@ -41,7 +42,7 @@ sealed class AgentActor : ReceiveActor<AgentActor.ICommand>, IWithTimers {
 		AgentRuntimeInfo AgentRuntimeInfo,
 		AgentConnectionKeys AgentConnectionKeys,
 		ControllerState ControllerState,
-		MinecraftVersions MinecraftVersions,
+		MinecraftLaunchRecipes LaunchRecipes,
 		IDbContextProvider DbProvider,
 		CancellationToken CancellationToken
 	);
@@ -54,7 +55,7 @@ sealed class AgentActor : ReceiveActor<AgentActor.ICommand>, IWithTimers {
 	
 	private readonly AgentConnectionKeys agentConnectionKeys;
 	private readonly ControllerState controllerState;
-	private readonly MinecraftVersions minecraftVersions;
+	private readonly MinecraftLaunchRecipes launchRecipes;
 	private readonly IDbContextProvider dbProvider;
 	private readonly CancellationToken cancellationToken;
 	
@@ -95,7 +96,7 @@ sealed class AgentActor : ReceiveActor<AgentActor.ICommand>, IWithTimers {
 	private AgentActor(Init init) {
 		this.agentConnectionKeys = init.AgentConnectionKeys;
 		this.controllerState = init.ControllerState;
-		this.minecraftVersions = init.MinecraftVersions;
+		this.launchRecipes = init.LaunchRecipes;
 		this.dbProvider = init.DbProvider;
 		this.cancellationToken = init.CancellationToken;
 		
@@ -190,13 +191,17 @@ sealed class AgentActor : ReceiveActor<AgentActor.ICommand>, IWithTimers {
 		var configurationMessages = ImmutableArray.CreateBuilder<ConfigureInstanceMessage>();
 		
 		foreach (var (instanceGuid, instanceConfiguration, _, _, launchAutomatically) in instanceDataByGuid.Values.ToImmutableArray()) {
-			var serverExecutableInfo = await minecraftVersions.GetServerExecutableInfo(instanceConfiguration.MinecraftVersion, cancellationToken);
+			var launchRecipe = await CreateInstanceLaunchRecipe(instanceConfiguration);
-			configurationMessages.Add(new ConfigureInstanceMessage(instanceGuid, instanceConfiguration, new InstanceLaunchProperties(serverExecutableInfo), launchAutomatically));
+			configurationMessages.Add(new ConfigureInstanceMessage(instanceGuid, instanceConfiguration.AsInfo, launchRecipe, launchAutomatically));
 		}
 		
 		return configurationMessages.ToImmutable();
 	}
 	
+	private async Task<InstanceLaunchRecipe?> CreateInstanceLaunchRecipe(InstanceConfiguration configuration) {
+		return await launchRecipes.Create(configuration, cancellationToken);
+	}
+	
 	public interface ICommand;
 	
 	private sealed record InitializeCommand : ICommand;
@@ -340,13 +345,14 @@ sealed class AgentActor : ReceiveActor<AgentActor.ICommand>, IWithTimers {
 			return Task.FromResult<Result<CreateOrUpdateInstanceResult, InstanceActionFailure>>(CreateOrUpdateInstanceResult.InstanceMemoryMustNotBeZero);
 		}
 		
-		return minecraftVersions.GetServerExecutableInfo(instanceConfiguration.MinecraftVersion, cancellationToken)
+		return launchRecipes.Create(instanceConfiguration, cancellationToken)
-		                        .ContinueOnActor(CreateOrUpdateInstance1, command)
+		                    .ContinueOnActor(CreateOrUpdateInstance1, command)
-		                        .Unwrap();
+		                    .Unwrap();
 	}
 	
-	private Task<Result<CreateOrUpdateInstanceResult, InstanceActionFailure>> CreateOrUpdateInstance1(FileDownloadInfo? serverExecutableInfo, CreateOrUpdateInstanceCommand command) {
+	private Task<Result<CreateOrUpdateInstanceResult, InstanceActionFailure>> CreateOrUpdateInstance1(InstanceLaunchRecipe? launchRecipe, CreateOrUpdateInstanceCommand command) {
-		if (serverExecutableInfo == null) {
+		if (launchRecipe == null) {
+			// TODO
 			return Task.FromResult<Result<CreateOrUpdateInstanceResult, InstanceActionFailure>>(CreateOrUpdateInstanceResult.MinecraftVersionDownloadInfoNotFound);
 		}
 		
@@ -357,7 +363,7 @@ sealed class AgentActor : ReceiveActor<AgentActor.ICommand>, IWithTimers {
 			instanceActorRef = CreateNewInstance(Instance.Offline(command.InstanceGuid, instanceConfiguration));
 		}
 		
-		var configureInstanceCommand = new InstanceActor.ConfigureInstanceCommand(command.LoggedInUserGuid, command.InstanceGuid, instanceConfiguration, new InstanceLaunchProperties(serverExecutableInfo), isCreatingInstance);
+		var configureInstanceCommand = new InstanceActor.ConfigureInstanceCommand(command.LoggedInUserGuid, command.InstanceGuid, instanceConfiguration, launchRecipe, isCreatingInstance);
 		
 		return instanceActorRef.Request(configureInstanceCommand, cancellationToken)
 		                       .ContinueOnActor(CreateOrUpdateInstance2, configureInstanceCommand);

Controller/Phantom.Controller.Services/Agents/AgentManager.cs

@@ -1,7 +1,6 @@
 using System.Collections.Concurrent;
 using System.Collections.Immutable;
 using Akka.Actor;
-using Microsoft.EntityFrameworkCore;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Replies;
 using Phantom.Common.Data.Web.Agent;
@@ -9,7 +8,6 @@ using Phantom.Common.Data.Web.Users;
 using Phantom.Common.Messages.Agent.Handshake;
 using Phantom.Common.Messages.Agent.ToAgent;
 using Phantom.Controller.Database;
-using Phantom.Controller.Database.Entities;
 using Phantom.Controller.Minecraft;
 using Phantom.Controller.Services.Users.Sessions;
 using Phantom.Utils.Actor;
@@ -23,7 +21,7 @@ sealed class AgentManager(
 	IActorRefFactory actorSystem,
 	AgentConnectionKeys agentConnectionKeys,
 	ControllerState controllerState,
-	MinecraftVersions minecraftVersions,
+	MinecraftLaunchRecipes launchRecipes,
 	IDbContextProvider dbProvider,
 	CancellationToken cancellationToken
 ) {
@@ -33,36 +31,22 @@ sealed class AgentManager(
 	
 	public async Task Initialize() {
 		await using var ctx = dbProvider.Eager();
-		await Migrate(ctx);
 		
 		await foreach (var entity in ctx.Agents.AsAsyncEnumerable().WithCancellation(cancellationToken)) {
 			var agentGuid = entity.AgentGuid;
 			
-			if (AddAgent(loggedInUserGuid: null, agentGuid, entity.Configuration, entity.AuthSecret!, entity.RuntimeInfo)) {
+			if (AddAgent(loggedInUserGuid: null, agentGuid, entity.Configuration, entity.AuthSecret, entity.RuntimeInfo)) {
 				Logger.Information("Loaded agent \"{AgentName}\" (GUID {AgentGuid}) from database.", entity.Name, agentGuid);
 			}
 		}
 	}
 	
 	private bool AddAgent(Guid? loggedInUserGuid, Guid agentGuid, AgentConfiguration configuration, AuthSecret authSecret, AgentRuntimeInfo runtimeInfo) {
-		var init = new AgentActor.Init(loggedInUserGuid, agentGuid, configuration, authSecret, runtimeInfo, agentConnectionKeys, controllerState, minecraftVersions, dbProvider, cancellationToken);
+		var init = new AgentActor.Init(loggedInUserGuid, agentGuid, configuration, authSecret, runtimeInfo, agentConnectionKeys, controllerState, launchRecipes, dbProvider, cancellationToken);
 		var name = "Agent:" + agentGuid;
 		return agentsByAgentGuid.TryAdd(agentGuid, actorSystem.ActorOf(AgentActor.Factory(init), name));
 	}
 	
-	private async Task Migrate(ApplicationDbContext ctx) {
-		List<AgentEntity> agentsWithoutSecrets = await ctx.Agents.Where(static entity => entity.AuthSecret == null).ToListAsync(cancellationToken);
-		if (agentsWithoutSecrets.Count == 0) {
-			return;
-		}
-		
-		foreach (var entity in agentsWithoutSecrets) {
-			entity.AuthSecret = AuthSecret.Generate();
-		}
-		
-		await ctx.SaveChangesAsync(cancellationToken);
-	}
-	
 	public async Task<ImmutableArray<ConfigureInstanceMessage>?> RegisterAgent(Guid agentGuid, AgentRegistration registration) {
 		if (!agentsByAgentGuid.TryGetValue(agentGuid, out var agentActor)) {
 			return null;

Controller/Phantom.Controller.Services/ControllerServices.cs

@@ -20,6 +20,7 @@ public sealed class ControllerServices : IDisposable {
 	
 	private ControllerState ControllerState { get; }
 	private MinecraftVersions MinecraftVersions { get; }
+	private MinecraftLaunchRecipes LaunchRecipes { get; }
 	
 	private AuthenticatedUserCache AuthenticatedUserCache { get; }
 	private UserManager UserManager { get; }
@@ -50,6 +51,7 @@ public sealed class ControllerServices : IDisposable {
 		
 		this.ControllerState = new ControllerState();
 		this.MinecraftVersions = new MinecraftVersions();
+		this.LaunchRecipes = new MinecraftLaunchRecipes(MinecraftVersions);
 		
 		this.AuthenticatedUserCache = new AuthenticatedUserCache();
 		this.UserManager = new UserManager(AuthenticatedUserCache, ControllerState, dbProvider);
@@ -58,7 +60,7 @@ public sealed class ControllerServices : IDisposable {
 		this.UserLoginManager = new UserLoginManager(AuthenticatedUserCache, dbProvider);
 		this.PermissionManager = new PermissionManager(dbProvider);
 		
-		this.AgentManager = new AgentManager(ActorSystem, new AgentConnectionKeys(agentCertificateThumbprint), ControllerState, MinecraftVersions, dbProvider, cancellationToken);
+		this.AgentManager = new AgentManager(ActorSystem, new AgentConnectionKeys(agentCertificateThumbprint), ControllerState, LaunchRecipes, dbProvider, cancellationToken);
 		this.InstanceLogManager = new InstanceLogManager();
 		
 		this.AuditLogManager = new AuditLogManager(dbProvider);

Controller/Phantom.Controller.Services/Instances/InstanceActor.cs

@@ -1,5 +1,6 @@
 using Phantom.Common.Data;
 using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
 using Phantom.Common.Data.Minecraft;
 using Phantom.Common.Data.Replies;
 using Phantom.Common.Data.Web.Instance;
@@ -70,7 +71,7 @@ sealed class InstanceActor : ReceiveActor<InstanceActor.ICommand> {
 	
 	public sealed record SetPlayerCountsCommand(InstancePlayerCounts? PlayerCounts) : ICommand;
 	
-	public sealed record ConfigureInstanceCommand(Guid AuditLogUserGuid, Guid InstanceGuid, InstanceConfiguration Configuration, InstanceLaunchProperties LaunchProperties, bool IsCreatingInstance) : ICommand, ICanReply<Result<ConfigureInstanceResult, InstanceActionFailure>>;
+	public sealed record ConfigureInstanceCommand(Guid AuditLogUserGuid, Guid InstanceGuid, InstanceConfiguration Configuration, InstanceLaunchRecipe LaunchRecipe, bool IsCreatingInstance) : ICommand, ICanReply<Result<ConfigureInstanceResult, InstanceActionFailure>>;
 	
 	public sealed record LaunchInstanceCommand(Guid AuditLogUserGuid) : ICommand, ICanReply<Result<LaunchInstanceResult, InstanceActionFailure>>;
 	
@@ -94,7 +95,7 @@ sealed class InstanceActor : ReceiveActor<InstanceActor.ICommand> {
 	}
 	
 	private async Task<Result<ConfigureInstanceResult, InstanceActionFailure>> ConfigureInstance(ConfigureInstanceCommand command) {
-		var message = new ConfigureInstanceMessage(command.InstanceGuid, command.Configuration, command.LaunchProperties);
+		var message = new ConfigureInstanceMessage(command.InstanceGuid, command.Configuration.AsInfo, command.LaunchRecipe);
 		var result = await SendInstanceActionMessage<ConfigureInstanceMessage, ConfigureInstanceResult>(message);
 		
 		if (result.Is(ConfigureInstanceResult.Success)) {

Directory.Build.props

@@ -1,8 +1,8 @@
 <Project>
   
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
-    <LangVersion>13</LangVersion>
+    <LangVersion>14</LangVersion>
   </PropertyGroup>
   
   <PropertyGroup>

Dockerfile

@@ -1,7 +1,7 @@
 # +---------------+
 # | Prepare build |
 # +---------------+
-FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/nightly/sdk:9.0 AS phantom-builder
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/nightly/sdk:10.0 AS phantom-builder
 ARG TARGETARCH
 
 ADD . /app
@@ -19,7 +19,7 @@ RUN find .artifacts/publish/*/* -maxdepth 0 -execdir mv '{}' 'release' \;
 # +---------------------+
 # | Phantom Agent image |
 # +---------------------+
-FROM mcr.microsoft.com/dotnet/nightly/runtime:9.0 AS phantom-agent
+FROM mcr.microsoft.com/dotnet/nightly/runtime:10.0 AS phantom-agent
 
 RUN mkdir /data && chmod 777 /data
 WORKDIR /data
@@ -46,7 +46,7 @@ ENTRYPOINT ["dotnet", "/app/Phantom.Agent.dll"]
 # +--------------------------+
 # | Phantom Controller image |
 # +--------------------------+
-FROM mcr.microsoft.com/dotnet/nightly/runtime:9.0 AS phantom-controller
+FROM mcr.microsoft.com/dotnet/nightly/runtime:10.0 AS phantom-controller
 
 RUN mkdir /data && chmod 777 /data
 WORKDIR /data

Packages.props

@@ -1,15 +1,14 @@
 <Project>
   
   <ItemGroup>
-    <PackageReference Update="Microsoft.AspNetCore.Components.Authorization" Version="9.0.9" />
+    <PackageReference Update="Microsoft.AspNetCore.Components.Authorization" Version="10.0.1" />
-    <PackageReference Update="Microsoft.AspNetCore.Components.Web"           Version="9.0.9" />
+    <PackageReference Update="Microsoft.AspNetCore.Components.Web"           Version="10.0.1" />
   </ItemGroup>
   
   <ItemGroup>
-    <PackageReference Update="Microsoft.EntityFrameworkCore.Relational" Version="9.0.9" />
+    <PackageReference Update="Microsoft.EntityFrameworkCore.Tools"      Version="10.0.1" />
-    <PackageReference Update="Microsoft.EntityFrameworkCore.Tools"      Version="9.0.9" />
+    <PackageReference Update="Microsoft.EntityFrameworkCore.Relational" Version="10.0.1" />
-    <PackageReference Update="Npgsql.EntityFrameworkCore.PostgreSQL"    Version="9.0.4" />
+    <PackageReference Update="Npgsql.EntityFrameworkCore.PostgreSQL"    Version="10.0.0" />
-    <PackageReference Update="System.Linq.Async"                        Version="6.0.3" />
   </ItemGroup>
   
   <ItemGroup>
@@ -23,7 +22,7 @@
   
   <ItemGroup>
     <PackageReference Update="Serilog"               Version="4.3.0" />
-    <PackageReference Update="Serilog.AspNetCore"    Version="9.0.0" />
+    <PackageReference Update="Serilog.AspNetCore"    Version="10.0.0" />
     <PackageReference Update="Serilog.Sinks.Async"   Version="2.1.0" />
     <PackageReference Update="Serilog.Sinks.Console" Version="6.0.0" />
   </ItemGroup>

Utils/Phantom.Utils/Collections/ImmutableCollectionExtensions.cs

@@ -0,0 +1,17 @@
+using System.Collections.Immutable;
+
+namespace Phantom.Utils.Collections;
+
+public static class ImmutableCollectionExtensions {
+	extension(ImmutableDictionary) {
+		public static ImmutableDictionary<TKey, TValue> From<TKey, TValue>(ReadOnlySpan<(TKey, TValue)> pairs) where TKey : notnull {
+			var builder = ImmutableDictionary.CreateBuilder<TKey, TValue>();
+			
+			foreach ((TKey key, TValue value) in pairs) {
+				builder.Add(key, value);
+			}
+			
+			return builder.ToImmutable();
+		}
+	}
+}

Utils/Phantom.Utils/IO/FileSize.cs

@@ -8,13 +8,17 @@ public readonly record struct FileSize(ulong Bytes) {
 	];
 	
 	public string ToHumanReadable(int decimalPlaces) {
-		int power = Bytes == 0L ? 0 : (int) Math.Log(Bytes, Scale);
+		return ToHumanReadable(Bytes, decimalPlaces);
+	}
+	
+	public static string ToHumanReadable(ulong bytes, int decimalPlaces) {
+		int power = bytes == 0L ? 0 : (int) Math.Log(bytes, Scale);
 		int unit = power >= Units.Length ? Units.Length - 1 : power;
 		if (unit == 0) {
-			return Bytes + " B";
+			return bytes + " B";
 		}
 		
 		string format = "{0:n" + decimalPlaces + "} {1}";
-		return string.Format(format, Bytes / Math.Pow(Scale, unit), Units[unit]);
+		return string.Format(format, bytes / Math.Pow(Scale, unit), Units[unit]);
 	}
 }

Utils/Phantom.Utils/IO/StreamCopier.cs

@@ -2,32 +2,24 @@
 
 namespace Phantom.Utils.IO;
 
-public sealed class StreamCopier : IDisposable {
+public sealed class StreamCopier(int bufferSize = StreamCopier.DefaultBufferSize) : IDisposable {
 	private const int DefaultBufferSize = 81920;
 	
 	public event EventHandler<BufferEventArgs>? BufferReady;
 	
-	private readonly int bufferSize;
+	private readonly byte[] buffer = ArrayPool<byte>.Shared.Rent(bufferSize);
-	
-	public StreamCopier(int bufferSize = DefaultBufferSize) {
-		this.bufferSize = bufferSize;
-	}
 	
 	public async Task Copy(Stream source, Stream destination, CancellationToken cancellationToken) {
-		byte[] buffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+		int bytesRead;
-		try {
+		while ((bytesRead = await source.ReadAsync(buffer.AsMemory(), cancellationToken)) != 0) {
-			int bytesRead;
+			var dataRead = new ReadOnlyMemory<byte>(buffer, start: 0, bytesRead);
-			while ((bytesRead = await source.ReadAsync(buffer.AsMemory(), cancellationToken)) != 0) {
+			BufferReady?.Invoke(this, new BufferEventArgs(dataRead));
-				var dataRead = new ReadOnlyMemory<byte>(buffer, start: 0, bytesRead);
+			await destination.WriteAsync(dataRead, cancellationToken);
-				BufferReady?.Invoke(this, new BufferEventArgs(dataRead));
-				await destination.WriteAsync(dataRead, cancellationToken);
-			}
-		} finally {
-			ArrayPool<byte>.Shared.Return(buffer);
 		}
 	}
 	
 	public void Dispose() {
+		ArrayPool<byte>.Shared.Return(buffer);
 		BufferReady = null;
 	}
 	

Utils/Phantom.Utils/Net/HttpHeadersExtensions.cs

@@ -0,0 +1,21 @@
+using System.Net.Http.Headers;
+using Phantom.Utils.IO;
+
+namespace Phantom.Utils.Net;
+
+public static class HttpHeadersExtensions {
+	private const string ContentLength = "Content-Length";
+	
+	extension(HttpResponseHeaders headers) {
+		public FileSize? ContentLength {
+			get {
+				if (!headers.TryGetValues(ContentLength, out var values)) {
+					return null;
+				}
+				
+				string? value = values.FirstOrDefault();
+				return value != null && ulong.TryParse(value, out ulong result) ? new FileSize(result) : null;
+			}
+		}
+	}
+}

Utils/Phantom.Utils/Processes/OneShotProcess.cs

@@ -2,17 +2,9 @@
 
 namespace Phantom.Utils.Processes;
 
-public sealed class OneShotProcess {
+public sealed class OneShotProcess(ILogger logger, ProcessConfigurator configurator) {
-	private readonly ILogger logger;
-	private readonly ProcessConfigurator configurator;
-	
 	public event EventHandler<Process.Output>? OutputReceived;
 	
-	public OneShotProcess(ILogger logger, ProcessConfigurator configurator) {
-		this.logger = logger;
-		this.configurator = configurator;
-	}
-	
 	public async Task<bool> Run(CancellationToken cancellationToken) {
 		using var process = configurator.CreateProcess();
 		process.OutputReceived += OutputReceived;

Utils/Phantom.Utils/Processes/ProcessConfigurator.cs

@@ -31,6 +31,12 @@ public sealed class ProcessConfigurator {
 		set => startInfo.UseShellExecute = value;
 	}
 	
+	public ProcessConfigurator() {
+		if (OperatingSystem.IsWindows()) {
+			startInfo.CreateNewProcessGroup = true;
+		}
+	}
+	
 	public Process CreateProcess() {
 		return new Process(new System.Diagnostics.Process { StartInfo = startInfo });
 	}

Web/Phantom.Web/App.razor

@@ -1,8 +1,9 @@
-@using Phantom.Web.Services
+@using Phantom.Web.Errors
+@using Phantom.Web.Services
 @inject Navigation Navigation
 
 <CascadingAuthenticationState>
-  <Router AppAssembly="@typeof(App).Assembly">
+  <Router AppAssembly="@typeof(App).Assembly" NotFoundPage="typeof(NotFound)">
     <Found Context="routeData">
       <AuthorizeRouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)">
         <NotAuthorized>
@@ -17,11 +18,5 @@
       </AuthorizeRouteView>
       <FocusOnNavigate RouteData="@routeData" Selector="h1" />
     </Found>
-    <NotFound>
-      <LayoutView Layout="@typeof(MainLayout)">
-        <h1>Not Found</h1>
-        <p role="alert">Sorry, there's nothing at this address.</p>
-      </LayoutView>
-    </NotFound>
   </Router>
 </CascadingAuthenticationState>

Web/Phantom.Web/Errors/NotFound.razor

@@ -0,0 +1,5 @@
+@page "/error/404"
+@layout MainLayout
+
+<h1>Not Found</h1>
+<p role="alert">Sorry, there's nothing at this address.</p>

Web/Phantom.Web/Layout/_Layout.cshtml

@@ -34,7 +34,7 @@
     <script src="_framework/blazor.server.js"></script>
     @* ReSharper restore Html.PathError *@
     <script src="lib/bootstrap/bootstrap.bundle.min.js"></script>
-    <script src="js/site.js"></script>
+    <script src="js/site.js?v=2"></script>
   </body>
 
 </html>

Web/Phantom.Web/Pages/Agents.razor

@@ -93,7 +93,7 @@
     <Cell>
       <PermissionView Permission="Permission.ManageAllAgents">
         <a href="agents/@agent.AgentGuid/edit" type="button" class="btn btn-primary btn-sm">Edit Agent</a>
-        <button type="button" class="btn btn-danger btn-sm" data-clipboard="@connectionKey" onclick="copyToClipboard(this);">Copy Agent Key</button>
+        <button type="button" class="btn btn-warning btn-sm" data-clipboard="@connectionKey" onclick="copyToClipboard(this);">Copy Agent Key</button>
       </PermissionView>
     </Cell>
   </ItemRow>

Web/Phantom.Web/Shared/InstanceAddOrEditForm.razor

@@ -108,7 +108,7 @@
 
     @{
       string? allowedServerPorts = selectedAgent?.RuntimeInfo.AllowedServerPorts?.ToString();
-      string? allowedRconPorts = selectedAgent?.RuntimeInfo.AllowedRconPorts?.ToString();
+      string? allowedRconPorts = selectedAgent?.RuntimeInfo.AllowedAdditionalPorts?.ToString();
     }
     <div class="col-sm-6 col-xl-2 mb-3">
       <FormNumberInput Id="instance-server-port" @bind-Value="form.ServerPort" min="0" max="65535">
@@ -261,7 +261,7 @@
 
     public sealed class RconPortMustBeAllowedAttribute : FormValidationAttribute<ConfigureInstanceFormModel, int> {
       protected override string FieldName => nameof(RconPort);
-      protected override bool IsValid(ConfigureInstanceFormModel model, int value) => model.SelectedAgent is not {} agent || agent.RuntimeInfo.AllowedRconPorts?.Contains((ushort) value) == true;
+      protected override bool IsValid(ConfigureInstanceFormModel model, int value) => model.SelectedAgent is not {} agent || agent.RuntimeInfo.AllowedAdditionalPorts?.Contains((ushort) value) == true;
     }
 
     public sealed class RconPortMustDifferFromServerPortAttribute : FormValidationAttribute<ConfigureInstanceFormModel, int?> {

Web/Phantom.Web/Shared/InstanceStatusText.razor

@@ -14,9 +14,15 @@
       break;
 
     case InstanceIsDownloading downloading:
-      <ProgressBar Value="@downloading.Progress" Maximum="100">
+      if (downloading.Progress is {} progress) {
-        <span class="fw-semibold">Downloading Server</span> (@downloading.Progress%)
+        <ProgressBar Value="@progress" Maximum="100">
-      </ProgressBar>
+          <span class="fw-semibold">Downloading</span> (@downloading.Progress%)
+        </ProgressBar>
+      }
+      else {
+        <span class="fw-semibold">Downloading</span>
+      }
+
       break;
 
     case InstanceIsLaunching:

Web/Phantom.Web/Utils/Messages.cs

@@ -1,4 +1,4 @@
-using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Instance.Launch;
 using Phantom.Common.Data.Replies;
 using Phantom.Common.Data.Web.Minecraft;
 using Phantom.Common.Data.Web.Users;
@@ -52,27 +52,25 @@ static class Messages {
 	
 	public static string ToSentence(this LaunchInstanceResult reason) {
 		return reason switch {
-			LaunchInstanceResult.LaunchInitiated          => "Launch initiated.",
+			LaunchInstanceResult.LaunchInitiated            => "Launch initiated.",
-			LaunchInstanceResult.InstanceAlreadyLaunching => "Instance is already launching.",
+			LaunchInstanceResult.InstanceAlreadyLaunching   => "Instance is already launching.",
-			LaunchInstanceResult.InstanceAlreadyRunning   => "Instance is already running.",
+			LaunchInstanceResult.InstanceAlreadyRunning     => "Instance is already running.",
-			LaunchInstanceResult.InstanceLimitExceeded    => "Agent does not have any more available instances.",
+			LaunchInstanceResult.InstanceLimitExceeded      => "Agent does not have any more available instances.",
-			LaunchInstanceResult.MemoryLimitExceeded      => "Agent does not have enough available memory.",
+			LaunchInstanceResult.MemoryLimitExceeded        => "Agent does not have enough available memory.",
-			LaunchInstanceResult.ServerPortNotAllowed     => "Server port not allowed.",
+			LaunchInstanceResult.ServerPortNotAllowed       => "Server port is not allowed.",
-			LaunchInstanceResult.ServerPortAlreadyInUse   => "Server port already in use.",
+			LaunchInstanceResult.ServerPortAlreadyInUse     => "Server port is already in use.",
-			LaunchInstanceResult.RconPortNotAllowed       => "Rcon port not allowed.",
+			LaunchInstanceResult.AdditionalPortNotAllowed   => "One of additional ports is not allowed.",
-			LaunchInstanceResult.RconPortAlreadyInUse     => "Rcon port already in use.",
+			LaunchInstanceResult.AdditionalPortAlreadyInUse => "One of additional ports is already in use.",
-			_                                             => "Unknown error.",
+			_                                               => "Unknown error.",
 		};
 	}
 	
 	public static string ToSentence(this InstanceLaunchFailReason reason) {
 		return reason switch {
-			InstanceLaunchFailReason.JavaRuntimeNotFound                    => "Java runtime not found.",
+			InstanceLaunchFailReason.CouldNotPrepareServerInstance => "Could not prepare server instance.",
-			InstanceLaunchFailReason.CouldNotDownloadMinecraftServer        => "Could not download Minecraft server.",
+			InstanceLaunchFailReason.CouldNotFindServerExecutable  => "Could not find server executable.",
-			InstanceLaunchFailReason.CouldNotConfigureMinecraftServer       => "Could not configure Minecraft server.",
+			InstanceLaunchFailReason.CouldNotStartServerExecutable => "Could not start server executable.",
-			InstanceLaunchFailReason.CouldNotPrepareMinecraftServerLauncher => "Could not prepare Minecraft server launcher.",
+			_                                                      => "Unknown error.",
-			InstanceLaunchFailReason.CouldNotStartMinecraftServer           => "Could not start Minecraft server.",
-			_                                                               => "Unknown error.",
 		};
 	}
 	

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.0",
+    "version": "10.0.0",
     "rollForward": "latestMinor",
     "allowPrerelease": true
   }