Restore SEBPatch

SafeExamBrowser.Service/Operations/ServiceEventCleanupOperation.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 SafeExamBrowser.Core.Contracts.OperationModel;
+using SafeExamBrowser.Core.Contracts.OperationModel.Events;
+using SafeExamBrowser.Logging.Contracts;
+
+namespace SafeExamBrowser.Service.Operations
+{
+	internal class ServiceEventCleanupOperation : IOperation
+	{
+		private ILogger logger;
+		private SessionContext sessionContext;
+
+		public event ActionRequiredEventHandler ActionRequired { add { } remove { } }
+		public event StatusChangedEventHandler StatusChanged { add { } remove { } }
+
+		public ServiceEventCleanupOperation(ILogger logger, SessionContext sessionContext)
+		{
+			this.logger = logger;
+			this.sessionContext = sessionContext;
+		}
+
+		public OperationResult Perform()
+		{
+			return OperationResult.Success;
+		}
+
+		public OperationResult Revert()
+		{
+			if (sessionContext.ServiceEvent != null)
+			{
+				logger.Info("Closing service event...");
+				sessionContext.ServiceEvent.Close();
+				logger.Info("Service event successfully closed.");
+			}
+
+			return OperationResult.Success;
+		}
+	}
+}