77 lines
1.8 KiB
C#
77 lines
1.8 KiB
C#
/*
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* Copyright (c) 2024 ETH Zürich, IT Services
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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.Timers;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.Monitoring.Contracts;
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using SafeExamBrowser.Settings.Security;
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using SafeExamBrowser.WindowsApi.Contracts;
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namespace SafeExamBrowser.Monitoring
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{
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public class Clipboard : IClipboard
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{
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private readonly ILogger logger;
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private readonly INativeMethods nativeMethods;
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private readonly Timer timer;
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private ClipboardPolicy policy;
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public Clipboard(ILogger logger, INativeMethods nativeMethods, int timeout_ms = 50)
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{
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this.logger = logger;
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this.nativeMethods = nativeMethods;
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this.timer = new Timer(timeout_ms);
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}
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public void Initialize(ClipboardPolicy policy)
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{
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this.policy = policy;
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nativeMethods.EmptyClipboard();
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logger.Debug("Cleared clipboard.");
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if (policy != ClipboardPolicy.Allow)
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{
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timer.Elapsed += Timer_Elapsed;
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timer.Start();
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logger.Debug($"Started clipboard monitoring with interval {timer.Interval} ms.");
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}
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else
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{
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logger.Debug("Clipboard is allowed, not starting monitoring.");
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}
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logger.Info($"Initialized clipboard for policy '{policy}'.");
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}
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public void Terminate()
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{
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nativeMethods.EmptyClipboard();
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logger.Debug("Cleared clipboard.");
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if (policy != ClipboardPolicy.Allow)
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{
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timer.Stop();
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logger.Debug("Stopped clipboard monitoring.");
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}
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else
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{
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logger.Debug("Clipboard monitoring was not active.");
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}
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logger.Info($"Finalized clipboard.");
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}
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private void Timer_Elapsed(object sender, ElapsedEventArgs e)
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{
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nativeMethods.EmptyClipboard();
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}
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}
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}
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