107 lines
3.2 KiB
C#
107 lines
3.2 KiB
C#
/*
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* Copyright (c) 2019 ETH Zürich, Educational Development and Technology (LET)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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using System.Security.AccessControl;
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using System.Security.Principal;
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using System.Threading;
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using SafeExamBrowser.Contracts.Communication.Hosts;
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using SafeExamBrowser.Contracts.Core.OperationModel;
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using SafeExamBrowser.Contracts.Logging;
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namespace SafeExamBrowser.Service.Operations
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{
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internal class SessionInitializationOperation : SessionOperation
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{
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private ILogger logger;
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private Func<string, ILogObserver> createLogWriter;
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private IServiceHost serviceHost;
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private ILogObserver sessionWriter;
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public SessionInitializationOperation(
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ILogger logger,
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Func<string, ILogObserver> createLogWriter,
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IServiceHost serviceHost,
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SessionContext sessionContext) : base(sessionContext)
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{
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this.logger = logger;
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this.createLogWriter = createLogWriter;
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this.serviceHost = serviceHost;
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}
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public override OperationResult Perform()
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{
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InitializeSessionWriter();
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logger.Info("Initializing new session...");
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serviceHost.AllowConnection = false;
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logger.Info($" -> Client-ID: {Context.Configuration.AppConfig.ClientId}");
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logger.Info($" -> Runtime-ID: {Context.Configuration.AppConfig.RuntimeId}");
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logger.Info($" -> Session-ID: {Context.Configuration.SessionId}");
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InitializeServiceEvent();
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return OperationResult.Success;
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}
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public override OperationResult Revert()
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{
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var success = true;
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logger.Info("Finalizing current session...");
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if (Context.ServiceEvent != null)
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{
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success = Context.ServiceEvent.Set();
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if (success)
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{
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logger.Info("Successfully informed runtime about session termination.");
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}
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else
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{
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logger.Error("Failed to inform runtime about session termination!");
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}
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}
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Context.Configuration = null;
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logger.Unsubscribe(sessionWriter);
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sessionWriter = null;
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serviceHost.AllowConnection = true;
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return success ? OperationResult.Success : OperationResult.Failed;
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}
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private void InitializeServiceEvent()
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{
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var securityIdentifier = new SecurityIdentifier(WellKnownSidType.BuiltinUsersSid, null);
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var accessRule = new EventWaitHandleAccessRule(securityIdentifier, EventWaitHandleRights.Synchronize, AccessControlType.Allow);
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var security = new EventWaitHandleSecurity();
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security.AddAccessRule(accessRule);
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if (Context.ServiceEvent != null)
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{
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logger.Info("Closing service event from previous session...");
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Context.ServiceEvent.Close();
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logger.Info("Service event successfully closed.");
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}
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logger.Info("Attempting to create new service event...");
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Context.ServiceEvent = new EventWaitHandle(false, EventResetMode.AutoReset, Context.Configuration.AppConfig.ServiceEventName, out _, security);
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logger.Info("Service event successfully created.");
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}
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private void InitializeSessionWriter()
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{
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sessionWriter = createLogWriter.Invoke(Context.Configuration.AppConfig.ServiceLogFilePath);
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logger.Subscribe(sessionWriter);
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}
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}
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}
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