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SEBSP-23: Implemented scaffolding for network redundancy.
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176 changes: 176 additions & 0 deletions
176
SafeExamBrowser.Proctoring/ScreenProctoring/DataCollector.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| /* | ||
| * Copyright (c) 2023 ETH Zürich, Educational Development and Technology (LET) | ||
| * | ||
| * 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; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using System.Timers; | ||
| using System.Windows.Input; | ||
| using SafeExamBrowser.Browser.Contracts; | ||
| using SafeExamBrowser.Logging.Contracts; | ||
| using SafeExamBrowser.Monitoring.Contracts.Applications; | ||
| using SafeExamBrowser.Proctoring.ScreenProctoring.Data; | ||
| using SafeExamBrowser.Proctoring.ScreenProctoring.Events; | ||
| using SafeExamBrowser.Proctoring.ScreenProctoring.Imaging; | ||
| using SafeExamBrowser.Settings.Proctoring; | ||
| using SafeExamBrowser.WindowsApi.Contracts; | ||
| using SafeExamBrowser.WindowsApi.Contracts.Events; | ||
| using MouseButton = SafeExamBrowser.WindowsApi.Contracts.Events.MouseButton; | ||
| using MouseButtonState = SafeExamBrowser.WindowsApi.Contracts.Events.MouseButtonState; | ||
| using Timer = System.Timers.Timer; | ||
|
|
||
| namespace SafeExamBrowser.Proctoring.ScreenProctoring | ||
| { | ||
| internal class DataCollector | ||
| { | ||
| private readonly object @lock = new object(); | ||
|
|
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| private readonly IApplicationMonitor applicationMonitor; | ||
| private readonly IBrowserApplication browser; | ||
| private readonly IModuleLogger logger; | ||
| private readonly INativeMethods nativeMethods; | ||
| private readonly ScreenProctoringSettings settings; | ||
| private readonly Timer timer; | ||
|
|
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| private DateTime last; | ||
| private Guid? keyboardHookId; | ||
| private Guid? mouseHookId; | ||
|
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| internal event DataCollectedEventHandler DataCollected; | ||
|
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| internal DataCollector( | ||
| IApplicationMonitor applicationMonitor, | ||
| IBrowserApplication browser, | ||
| IModuleLogger logger, | ||
| INativeMethods nativeMethods, | ||
| ScreenProctoringSettings settings) | ||
| { | ||
| this.applicationMonitor = applicationMonitor; | ||
| this.browser = browser; | ||
| this.logger = logger; | ||
| this.nativeMethods = nativeMethods; | ||
| this.settings = settings; | ||
| this.timer = new Timer(); | ||
| } | ||
|
|
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| internal void Start() | ||
| { | ||
| last = DateTime.Now; | ||
|
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| keyboardHookId = nativeMethods.RegisterKeyboardHook(KeyboardHookCallback); | ||
| mouseHookId = nativeMethods.RegisterMouseHook(MouseHookCallback); | ||
|
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| timer.AutoReset = false; | ||
| timer.Elapsed += MaxIntervalElapsed; | ||
| timer.Interval = settings.MaxInterval; | ||
| timer.Start(); | ||
|
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| logger.Debug("Started."); | ||
| } | ||
|
|
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| internal void Stop() | ||
| { | ||
| last = DateTime.Now; | ||
|
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| if (keyboardHookId.HasValue) | ||
| { | ||
| nativeMethods.DeregisterKeyboardHook(keyboardHookId.Value); | ||
| } | ||
|
|
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| if (mouseHookId.HasValue) | ||
| { | ||
| nativeMethods.DeregisterMouseHook(mouseHookId.Value); | ||
| } | ||
|
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| keyboardHookId = default; | ||
| mouseHookId = default; | ||
|
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| timer.Elapsed -= MaxIntervalElapsed; | ||
| timer.Stop(); | ||
|
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| logger.Debug("Stopped."); | ||
| } | ||
|
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| private bool KeyboardHookCallback(int keyCode, KeyModifier modifier, KeyState state) | ||
| { | ||
| var trigger = new KeyboardTrigger | ||
| { | ||
| Key = KeyInterop.KeyFromVirtualKey(keyCode), | ||
| Modifier = modifier, | ||
| State = state | ||
| }; | ||
|
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| TryCollect(keyboard: trigger); | ||
|
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| return false; | ||
| } | ||
|
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| private void MaxIntervalElapsed(object sender, ElapsedEventArgs args) | ||
| { | ||
| var trigger = new IntervalTrigger | ||
| { | ||
| ConfigurationValue = settings.MaxInterval, | ||
| TimeElapsed = Convert.ToInt32(DateTime.Now.Subtract(last).TotalMilliseconds) | ||
| }; | ||
|
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| TryCollect(interval: trigger); | ||
| } | ||
|
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| private bool MouseHookCallback(MouseButton button, MouseButtonState state, MouseInformation info) | ||
| { | ||
| var trigger = new MouseTrigger | ||
| { | ||
| Button = button, | ||
| Info = info, | ||
| State = state | ||
| }; | ||
|
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| TryCollect(mouse: trigger); | ||
|
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| return false; | ||
| } | ||
|
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| private void TryCollect(IntervalTrigger interval = default, KeyboardTrigger keyboard = default, MouseTrigger mouse = default) | ||
| { | ||
| if (MinIntervalElapsed() && Monitor.TryEnter(@lock)) | ||
| { | ||
| var elapsed = DateTime.Now.Subtract(last); | ||
|
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| last = DateTime.Now; | ||
| timer.Stop(); | ||
|
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| Task.Run(() => | ||
| { | ||
| try | ||
| { | ||
| var metadata = new Metadata(applicationMonitor, browser, elapsed, logger.CloneFor(nameof(Metadata))); | ||
| var screenShot = new ScreenShot(logger.CloneFor(nameof(ScreenShot)), settings); | ||
| metadata.Capture(interval, keyboard, mouse); | ||
| screenShot.Take(); | ||
| screenShot.Compress(); | ||
| DataCollected?.Invoke(metadata, screenShot); | ||
| } | ||
| catch (Exception e) | ||
| { | ||
| logger.Error("Failed to execute data collection!", e); | ||
| } | ||
| }); | ||
|
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| timer.Start(); | ||
| Monitor.Exit(@lock); | ||
| } | ||
| } | ||
|
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| private bool MinIntervalElapsed() | ||
| { | ||
| return DateTime.Now.Subtract(last) >= new TimeSpan(0, 0, 0, 0, settings.MinInterval); | ||
| } | ||
| } | ||
| } |
15 changes: 15 additions & 0 deletions
15
SafeExamBrowser.Proctoring/ScreenProctoring/Events/DataCollectedEventHandler.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| /* | ||
| * Copyright (c) 2023 ETH Zürich, Educational Development and Technology (LET) | ||
| * | ||
| * 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.Proctoring.ScreenProctoring.Data; | ||
| using SafeExamBrowser.Proctoring.ScreenProctoring.Imaging; | ||
|
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| namespace SafeExamBrowser.Proctoring.ScreenProctoring.Events | ||
| { | ||
| internal delegate void DataCollectedEventHandler(Metadata metadata, ScreenShot screenShot); | ||
| } |
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