Restore SEBPatch

SafeExamBrowser.UserInterface.Shared/Activators/TerminationActivator.cs

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2024 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.Windows.Input;
+using SafeExamBrowser.Logging.Contracts;
+using SafeExamBrowser.UserInterface.Contracts.Shell;
+using SafeExamBrowser.UserInterface.Contracts.Shell.Events;
+using SafeExamBrowser.WindowsApi.Contracts;
+using SafeExamBrowser.WindowsApi.Contracts.Events;
+
+namespace SafeExamBrowser.UserInterface.Shared.Activators
+{
+	public class TerminationActivator : KeyboardActivator, ITerminationActivator
+	{
+		private bool Q, LeftCtrl, RightCtrl;
+		private ILogger logger;
+
+		public event ActivatorEventHandler Activated;
+
+		public TerminationActivator(ILogger logger, INativeMethods nativeMethods) : base(nativeMethods)
+		{
+			this.logger = logger;
+		}
+
+		protected override void OnBeforeResume()
+		{
+			Q = false;
+			LeftCtrl = false;
+			RightCtrl = false;
+		}
+
+		protected override bool Process(Key key, KeyModifier modifier, KeyState state)
+		{
+			var changed = false;
+			var pressed = state == KeyState.Pressed;
+
+			switch (key)
+			{
+				case Key.Q:
+					changed = Q != pressed;
+					Q = pressed;
+					break;
+				case Key.LeftCtrl:
+					changed = LeftCtrl != pressed;
+					LeftCtrl = pressed;
+					break;
+				case Key.RightCtrl:
+					changed = RightCtrl != pressed;
+					RightCtrl = pressed;
+					break;
+			}
+
+			if (Q && (LeftCtrl || RightCtrl) && changed && !modifier.HasFlag(KeyModifier.Alt))
+			{
+				logger.Debug("Detected termination sequence.");
+				Activated?.Invoke();
+
+				return true;
+			}
+
+			return false;
+		}
+	}
+}