Restore SEBPatch

SafeExamBrowser.Monitoring/Clipboard.cs

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+/*
+ * 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.Timers;
+using SafeExamBrowser.Logging.Contracts;
+using SafeExamBrowser.Monitoring.Contracts;
+using SafeExamBrowser.Settings.Security;
+using SafeExamBrowser.WindowsApi.Contracts;
+
+namespace SafeExamBrowser.Monitoring
+{
+	public class Clipboard : IClipboard
+	{
+		private readonly ILogger logger;
+		private readonly INativeMethods nativeMethods;
+		private readonly Timer timer;
+
+		private ClipboardPolicy policy;
+
+		public Clipboard(ILogger logger, INativeMethods nativeMethods, int timeout_ms = 50)
+		{
+			this.logger = logger;
+			this.nativeMethods = nativeMethods;
+			this.timer = new Timer(timeout_ms);
+		}
+
+		public void Initialize(ClipboardPolicy policy)
+		{
+			this.policy = policy;
+			logger.Debug("Cleared clipboard.");
+
+			if (policy != ClipboardPolicy.Allow)
+			{
+				timer.Elapsed += Timer_Elapsed;
+				timer.Start();
+
+				logger.Debug($"Started clipboard monitoring with interval {timer.Interval} ms.");
+			}
+			else
+			{
+				logger.Debug("Clipboard is allowed, not starting monitoring.");
+			}
+
+			logger.Info($"Initialized clipboard for policy '{policy}'.");
+		}
+
+		public void Terminate()
+		{
+			logger.Debug("Cleared clipboard.");
+
+			if (policy != ClipboardPolicy.Allow)
+			{
+				timer.Stop();
+				logger.Debug("Stopped clipboard monitoring.");
+			}
+			else
+			{
+				logger.Debug("Clipboard monitoring was not active.");
+			}
+
+			logger.Info($"Finalized clipboard.");
+		}
+
+		private void Timer_Elapsed(object sender, ElapsedEventArgs e)
+		{
+			
+		}
+	}
+}