125 lines
2.6 KiB
C#
125 lines
2.6 KiB
C#
/*
|
|
* 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.Threading.Tasks;
|
|
using System.Timers;
|
|
using SafeExamBrowser.Logging.Contracts;
|
|
using SafeExamBrowser.Monitoring.Contracts.System.Events;
|
|
using SafeExamBrowser.WindowsApi.Contracts;
|
|
|
|
namespace SafeExamBrowser.Monitoring.System.Components
|
|
{
|
|
internal class StickyKeys
|
|
{
|
|
private readonly ILogger logger;
|
|
private readonly INativeMethods nativeMethods;
|
|
private readonly Timer timer;
|
|
|
|
private IStickyKeysState original;
|
|
|
|
internal event SentinelEventHandler Changed;
|
|
|
|
internal StickyKeys(ILogger logger, INativeMethods nativeMethods)
|
|
{
|
|
this.logger = logger;
|
|
this.nativeMethods = nativeMethods;
|
|
this.timer = new Timer();
|
|
}
|
|
|
|
internal bool Disable()
|
|
{
|
|
|
|
return true;
|
|
}
|
|
|
|
internal bool Enable()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
internal bool Revert()
|
|
{
|
|
var success = true;
|
|
|
|
if (original != default)
|
|
{
|
|
success = nativeMethods.TrySetStickyKeys(original);
|
|
|
|
if (success)
|
|
{
|
|
logger.Info($"Successfully reverted sticky keys (original state: {ToString(original)}).");
|
|
}
|
|
else
|
|
{
|
|
logger.Error($"Failed to revert sticky keys (original state: {ToString(original)})!");
|
|
}
|
|
}
|
|
|
|
original = default;
|
|
|
|
return success;
|
|
}
|
|
|
|
internal void StartMonitoring()
|
|
{
|
|
timer.AutoReset = true;
|
|
timer.Elapsed += Timer_Elapsed;
|
|
timer.Interval = 1000;
|
|
timer.Start();
|
|
|
|
logger.Info("Started monitoring sticky keys.");
|
|
}
|
|
|
|
internal void StopMonitoring()
|
|
{
|
|
timer.Elapsed -= Timer_Elapsed;
|
|
timer.Stop();
|
|
|
|
logger.Info("Stopped monitoring sticky keys.");
|
|
}
|
|
|
|
private void Timer_Elapsed(object sender, ElapsedEventArgs e)
|
|
{
|
|
|
|
}
|
|
|
|
private void HandleStickyKeysChange(IStickyKeysState state)
|
|
{
|
|
var args = new SentinelEventArgs();
|
|
|
|
logger.Warn($"The sticky keys state has changed: {ToString(state)}.");
|
|
|
|
Task.Run(() => Changed?.Invoke(args)).ContinueWith((_) =>
|
|
{
|
|
if (args.Allow)
|
|
{
|
|
StopMonitoring();
|
|
}
|
|
});
|
|
|
|
if (nativeMethods.DisableStickyKeys())
|
|
{
|
|
logger.Info($"Disabled sticky keys.");
|
|
}
|
|
else
|
|
{
|
|
logger.Error($"Failed to disable sticky keys!");
|
|
}
|
|
}
|
|
|
|
private string ToString(IStickyKeysState state)
|
|
{
|
|
var availability = state.IsAvailable ? "available" : "unavailable";
|
|
var status = state.IsEnabled ? "enabled" : "disabled";
|
|
var hotkey = state.IsHotkeyActive ? "active" : "inactive";
|
|
|
|
return $"functionality {availability} and {status}, hotkey {hotkey}";
|
|
}
|
|
}
|
|
}
|