Missing files + start working on offline patcher

SafeExamBrowser.Client/Responsibilities/ServerResponsibility.cs

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2025 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using System.Linq;
+using SafeExamBrowser.Client.Contracts;
+using SafeExamBrowser.I18n.Contracts;
+using SafeExamBrowser.Logging.Contracts;
+using SafeExamBrowser.Server.Contracts;
+using SafeExamBrowser.UserInterface.Contracts.Windows.Data;
+
+namespace SafeExamBrowser.Client.Responsibilities
+{
+	internal class ServerResponsibility : ClientResponsibility
+	{
+		private readonly ICoordinator coordinator;
+		private readonly IText text;
+
+		private IServerProxy Server => Context.Server;
+
+		public ServerResponsibility(ClientContext context, ICoordinator coordinator, ILogger logger, IText text) : base(context, logger)
+		{
+			this.coordinator = coordinator;
+			this.text = text;
+		}
+
+		public override void Assume(ClientTask task)
+		{
+			switch (task)
+			{
+				case ClientTask.DeregisterEvents:
+					DeregisterEvents();
+					break;
+				case ClientTask.RegisterEvents:
+					RegisterEvents();
+					break;
+			}
+		}
+
+		private void DeregisterEvents()
+		{
+			if (Server != default)
+			{
+				Server.LockScreenConfirmed -= Server_LockScreenConfirmed;
+				Server.LockScreenRequested -= Server_LockScreenRequested;
+				Server.TerminationRequested -= Server_TerminationRequested;
+			}
+		}
+
+		private void RegisterEvents()
+		{
+			Server.LockScreenConfirmed += Server_LockScreenConfirmed;
+			Server.LockScreenRequested += Server_LockScreenRequested;
+			Server.TerminationRequested += Server_TerminationRequested;
+		}
+
+		private void Server_LockScreenConfirmed()
+		{
+			Logger.Info("Closing lock screen as requested by the server...");
+			Context.LockScreen?.Cancel();
+		}
+
+		private void Server_LockScreenRequested(string message)
+		{
+			Logger.Info("Attempting to show lock screen as requested by the server...");
+
+			if (coordinator.RequestSessionLock())
+			{
+				ShowLockScreen(message, text.Get(TextKey.LockScreen_Title), Enumerable.Empty<LockScreenOption>());
+				coordinator.ReleaseSessionLock();
+			}
+			else
+			{
+				Logger.Info("Lock screen is already active.");
+			}
+		}
+
+		private void Server_TerminationRequested()
+		{
+			Logger.Info("Attempting to shutdown as requested by the server...");
+			TryRequestShutdown();
+		}
+	}
+}