74 lines
2.3 KiB
C#
74 lines
2.3 KiB
C#
/*
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* Copyright (c) 2017 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.Linq;
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using System.Windows.Input;
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using SafeExamBrowser.Contracts.Configuration.Settings;
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using SafeExamBrowser.Contracts.Logging;
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using SafeExamBrowser.Contracts.Monitoring;
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namespace SafeExamBrowser.Monitoring.Keyboard
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{
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public class KeyboardInterceptor : IKeyboardInterceptor
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{
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private IKeyboardSettings settings;
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private ILogger logger;
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public KeyboardInterceptor(IKeyboardSettings settings, ILogger logger)
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{
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this.logger = logger;
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this.settings = settings;
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}
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public bool Block(int keyCode, KeyModifier modifier, KeyState state)
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{
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var block = false;
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var key = KeyInterop.KeyFromVirtualKey(keyCode);
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block |= key == Key.Apps;
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block |= key == Key.F1;
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block |= key == Key.F2;
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block |= key == Key.F3;
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block |= key == Key.F4;
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block |= key == Key.F6;
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block |= key == Key.F7;
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block |= key == Key.F8;
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block |= key == Key.F9;
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block |= key == Key.F10;
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block |= key == Key.F11;
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block |= key == Key.F12;
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block |= key == Key.LWin;
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block |= key == Key.PrintScreen;
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block |= key == Key.RWin;
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block |= key == Key.Escape && modifier.HasFlag(KeyModifier.Alt);
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block |= key == Key.Escape && modifier.HasFlag(KeyModifier.Ctrl);
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block |= key == Key.Space && modifier.HasFlag(KeyModifier.Alt);
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block |= !settings.AllowAltTab && key == Key.Tab && modifier.HasFlag(KeyModifier.Alt);
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block |= !settings.AllowEsc && key == Key.Escape && modifier == KeyModifier.None;
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block |= !settings.AllowF5 && key == Key.F5;
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if (block)
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{
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Log(key, keyCode, modifier, state);
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}
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return block;
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}
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private void Log(Key key, int keyCode, KeyModifier modifier, KeyState state)
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{
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var modifierFlags = Enum.GetValues(typeof(KeyModifier)).OfType<KeyModifier>().Where(m => m != KeyModifier.None && modifier.HasFlag(m));
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var modifiers = modifierFlags.Any() ? String.Join(" + ", modifierFlags) + " + " : string.Empty;
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logger.Info($"Blocked '{modifiers}{key}' ({key} = {keyCode}) when {state.ToString().ToLower()}.");
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}
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}
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}
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