626 lines
21 KiB
C#
626 lines
21 KiB
C#
/*
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* Copyright (c) 2021 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.Net.Http;
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using System.Threading.Tasks;
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using CefSharp;
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using SafeExamBrowser.Applications.Contracts;
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using SafeExamBrowser.Applications.Contracts.Events;
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using SafeExamBrowser.Browser.Contracts.Events;
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using SafeExamBrowser.Browser.Contracts.Filters;
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using SafeExamBrowser.Browser.Events;
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using SafeExamBrowser.Browser.Filters;
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using SafeExamBrowser.Browser.Handlers;
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using SafeExamBrowser.Configuration.Contracts;
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using SafeExamBrowser.Configuration.Contracts.Cryptography;
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using SafeExamBrowser.Core.Contracts.Resources.Icons;
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using SafeExamBrowser.I18n.Contracts;
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using SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.Settings.Browser;
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using SafeExamBrowser.Settings.Browser.Filter;
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using SafeExamBrowser.UserInterface.Contracts;
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using SafeExamBrowser.UserInterface.Contracts.Browser;
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using SafeExamBrowser.UserInterface.Contracts.Browser.Data;
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using SafeExamBrowser.UserInterface.Contracts.FileSystemDialog;
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using SafeExamBrowser.UserInterface.Contracts.MessageBox;
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using Syroot.Windows.IO;
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using BrowserSettings = SafeExamBrowser.Settings.Browser.BrowserSettings;
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using Request = SafeExamBrowser.Browser.Contracts.Filters.Request;
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using ResourceHandler = SafeExamBrowser.Browser.Handlers.ResourceHandler;
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using TitleChangedEventHandler = SafeExamBrowser.Applications.Contracts.Events.TitleChangedEventHandler;
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namespace SafeExamBrowser.Browser
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{
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internal class BrowserApplicationInstance : IApplicationWindow
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{
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private const double ZOOM_FACTOR = 0.2;
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private AppConfig appConfig;
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private IBrowserControl control;
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private IBrowserWindow window;
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private HttpClient httpClient;
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private bool isMainInstance;
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private IFileSystemDialog fileSystemDialog;
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private IHashAlgorithm hashAlgorithm;
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private IMessageBox messageBox;
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private IModuleLogger logger;
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private BrowserSettings settings;
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private string startUrl;
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private IText text;
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private IUserInterfaceFactory uiFactory;
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private double zoomLevel;
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private WindowSettings WindowSettings
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{
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get { return isMainInstance ? settings.MainWindow : settings.AdditionalWindow; }
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}
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internal int Id { get; }
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public IntPtr Handle { get; private set; }
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public IconResource Icon { get; private set; }
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public string Title { get; private set; }
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internal event DownloadRequestedEventHandler ConfigurationDownloadRequested;
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internal event PopupRequestedEventHandler PopupRequested;
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internal event ResetRequestedEventHandler ResetRequested;
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internal event SessionIdentifierDetectedEventHandler SessionIdentifierDetected;
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internal event InstanceTerminatedEventHandler Terminated;
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internal event TerminationRequestedEventHandler TerminationRequested;
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public event IconChangedEventHandler IconChanged;
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public event TitleChangedEventHandler TitleChanged;
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public BrowserApplicationInstance(
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AppConfig appConfig,
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BrowserSettings settings,
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int id,
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bool isMainInstance,
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IFileSystemDialog fileSystemDialog,
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IHashAlgorithm hashAlgorithm,
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IMessageBox messageBox,
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IModuleLogger logger,
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IText text,
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IUserInterfaceFactory uiFactory,
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string startUrl)
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{
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this.appConfig = appConfig;
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this.Id = id;
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this.httpClient = new HttpClient();
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this.isMainInstance = isMainInstance;
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this.fileSystemDialog = fileSystemDialog;
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this.hashAlgorithm = hashAlgorithm;
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this.messageBox = messageBox;
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this.logger = logger;
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this.settings = settings;
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this.text = text;
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this.uiFactory = uiFactory;
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this.startUrl = startUrl;
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}
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public void Activate()
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{
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window.BringToForeground();
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}
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internal void Initialize()
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{
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InitializeControl();
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InitializeWindow();
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}
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internal void Terminate()
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{
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window.Close();
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control.Destroy();
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}
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private void InitializeControl()
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{
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var contextMenuHandler = new ContextMenuHandler();
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var dialogHandler = new DialogHandler();
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var displayHandler = new DisplayHandler();
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var downloadLogger = logger.CloneFor($"{nameof(DownloadHandler)} #{Id}");
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var downloadHandler = new DownloadHandler(appConfig, downloadLogger, settings, WindowSettings);
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var keyboardHandler = new KeyboardHandler();
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var lifeSpanHandler = new LifeSpanHandler();
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var requestFilter = new RequestFilter();
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var requestLogger = logger.CloneFor($"{nameof(RequestHandler)} #{Id}");
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var resourceHandler = new ResourceHandler(appConfig, requestFilter, logger, settings, WindowSettings, text);
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var requestHandler = new RequestHandler(appConfig, requestFilter, requestLogger, resourceHandler, settings, WindowSettings, text);
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Icon = new BrowserIconResource();
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dialogHandler.DialogRequested += DialogHandler_DialogRequested;
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displayHandler.FaviconChanged += DisplayHandler_FaviconChanged;
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displayHandler.ProgressChanged += DisplayHandler_ProgressChanged;
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downloadHandler.ConfigurationDownloadRequested += DownloadHandler_ConfigurationDownloadRequested;
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downloadHandler.DownloadUpdated += DownloadHandler_DownloadUpdated;
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keyboardHandler.FindRequested += KeyboardHandler_FindRequested;
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keyboardHandler.HomeNavigationRequested += HomeNavigationRequested;
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keyboardHandler.ReloadRequested += ReloadRequested;
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keyboardHandler.ZoomInRequested += ZoomInRequested;
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keyboardHandler.ZoomOutRequested += ZoomOutRequested;
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keyboardHandler.ZoomResetRequested += ZoomResetRequested;
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lifeSpanHandler.PopupRequested += LifeSpanHandler_PopupRequested;
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resourceHandler.SessionIdentifierDetected += (id) => SessionIdentifierDetected?.Invoke(id);
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requestHandler.QuitUrlVisited += RequestHandler_QuitUrlVisited;
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requestHandler.RequestBlocked += RequestHandler_RequestBlocked;
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InitializeRequestFilter(requestFilter);
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control = new BrowserControl(
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contextMenuHandler,
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dialogHandler,
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displayHandler,
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downloadHandler,
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keyboardHandler,
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lifeSpanHandler,
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requestHandler,
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startUrl);
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control.AddressChanged += Control_AddressChanged;
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control.LoadFailed += Control_LoadFailed;
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control.LoadingStateChanged += Control_LoadingStateChanged;
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control.TitleChanged += Control_TitleChanged;
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control.Initialize();
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logger.Debug("Initialized browser control.");
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}
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private void InitializeRequestFilter(IRequestFilter requestFilter)
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{
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if (settings.Filter.ProcessContentRequests || settings.Filter.ProcessMainRequests)
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{
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var factory = new RuleFactory();
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foreach (var settings in settings.Filter.Rules)
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{
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var rule = factory.CreateRule(settings.Type);
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rule.Initialize(settings);
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requestFilter.Load(rule);
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}
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logger.Debug($"Initialized request filter with {settings.Filter.Rules.Count} rule(s).");
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if (requestFilter.Process(new Request { Url = settings.StartUrl }) != FilterResult.Allow)
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{
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var rule = factory.CreateRule(FilterRuleType.Simplified);
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rule.Initialize(new FilterRuleSettings { Expression = settings.StartUrl, Result = FilterResult.Allow });
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requestFilter.Load(rule);
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logger.Debug($"Automatically created filter rule to allow start URL{(WindowSettings.UrlPolicy.CanLog() ? $" '{settings.StartUrl}'" : "")}.");
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}
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}
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}
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private void InitializeWindow()
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{
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window = uiFactory.CreateBrowserWindow(control, settings, isMainInstance);
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window.Closing += Window_Closing;
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window.AddressChanged += Window_AddressChanged;
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window.BackwardNavigationRequested += Window_BackwardNavigationRequested;
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window.DeveloperConsoleRequested += Window_DeveloperConsoleRequested;
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window.FindRequested += Window_FindRequested;
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window.ForwardNavigationRequested += Window_ForwardNavigationRequested;
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window.HomeNavigationRequested += HomeNavigationRequested;
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window.ReloadRequested += ReloadRequested;
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window.ZoomInRequested += ZoomInRequested;
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window.ZoomOutRequested += ZoomOutRequested;
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window.ZoomResetRequested += ZoomResetRequested;
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window.UpdateZoomLevel(CalculateZoomPercentage());
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window.Show();
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Handle = window.Handle;
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logger.Debug("Initialized browser window.");
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}
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private void Control_AddressChanged(string address)
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{
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logger.Debug($"Navigated{(WindowSettings.UrlPolicy.CanLog() ? $" to '{address}'" : "")}.");
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window.UpdateAddress(address);
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if (WindowSettings.UrlPolicy == UrlPolicy.Always || WindowSettings.UrlPolicy == UrlPolicy.BeforeTitle)
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{
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Title = address;
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window.UpdateTitle(address);
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TitleChanged?.Invoke(address);
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}
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}
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private void Control_LoadFailed(int errorCode, string errorText, string url)
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{
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if (errorCode == (int) CefErrorCode.None)
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{
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logger.Info($"Request{(WindowSettings.UrlPolicy.CanLog() ? $" for '{url}'" : "")} was successful.");
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}
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else if (errorCode == (int) CefErrorCode.Aborted)
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{
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logger.Info($"Request{(WindowSettings.UrlPolicy.CanLog() ? $" for '{url}'" : "")} was aborted.");
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}
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else if (errorCode == (int) CefErrorCode.UnknownUrlScheme)
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{
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logger.Info($"Request{(WindowSettings.UrlPolicy.CanLog() ? $" for '{url}'" : "")} contains unknown URL scheme and will be handled by the OS.");
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}
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else
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{
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var title = text.Get(TextKey.Browser_LoadErrorTitle);
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var message = text.Get(TextKey.Browser_LoadErrorMessage).Replace("%%URL%%", WindowSettings.UrlPolicy.CanLogError() ? url : "") + $" {errorText} ({errorCode})";
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logger.Warn($"Request{(WindowSettings.UrlPolicy.CanLogError() ? $" for '{url}'" : "")} failed: {errorText} ({errorCode}).");
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Task.Run(() => messageBox.Show(message, title, icon: MessageBoxIcon.Error, parent: window)).ContinueWith(_ => control.NavigateBackwards());
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}
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}
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private void Control_LoadingStateChanged(bool isLoading)
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{
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window.CanNavigateBackwards = WindowSettings.AllowBackwardNavigation && control.CanNavigateBackwards;
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window.CanNavigateForwards = WindowSettings.AllowForwardNavigation && control.CanNavigateForwards;
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window.UpdateLoadingState(isLoading);
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}
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private void Control_TitleChanged(string title)
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{
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if (WindowSettings.UrlPolicy != UrlPolicy.Always)
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{
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Title = title;
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window.UpdateTitle(Title);
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TitleChanged?.Invoke(Title);
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}
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}
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private void DialogHandler_DialogRequested(DialogRequestedEventArgs args)
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{
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var isDownload = args.Operation == FileSystemOperation.Save;
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var isUpload = args.Operation == FileSystemOperation.Open;
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var isAllowed = (isDownload && settings.AllowDownloads) || (isUpload && settings.AllowUploads);
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var initialPath = default(string);
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if (isDownload)
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{
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initialPath = args.InitialPath;
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}
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else
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{
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initialPath = string.IsNullOrEmpty(settings.DownAndUploadDirectory) ? KnownFolders.Downloads.ExpandedPath : Environment.ExpandEnvironmentVariables(settings.DownAndUploadDirectory);
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}
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if (isAllowed)
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{
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var result = fileSystemDialog.Show(
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args.Element,
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args.Operation,
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initialPath,
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title: args.Title,
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parent: window,
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restrictNavigation: !settings.AllowCustomDownAndUploadLocation);
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if (result.Success)
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{
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args.FullPath = result.FullPath;
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args.Success = result.Success;
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logger.Debug($"User selected path '{result.FullPath}' when asked to {args.Operation}->{args.Element}.");
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}
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else
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{
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logger.Debug($"User aborted file system dialog to {args.Operation}->{args.Element}.");
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}
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}
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else
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{
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logger.Info($"Blocked file system dialog to {args.Operation}->{args.Element}, as {(isDownload ? "downloading" : "uploading")} is not allowed.");
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}
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}
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private void DisplayHandler_FaviconChanged(string uri)
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{
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Task.Run(() =>
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{
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var request = new HttpRequestMessage(HttpMethod.Head, uri);
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var response = httpClient.SendAsync(request).ContinueWith(task =>
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{
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if (task.IsCompleted && task.Result.IsSuccessStatusCode)
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{
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Icon = new BrowserIconResource(uri);
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IconChanged?.Invoke(Icon);
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window.UpdateIcon(Icon);
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}
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});
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});
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}
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private void DisplayHandler_ProgressChanged(double value)
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{
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window.UpdateProgress(value);
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}
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private void DownloadHandler_ConfigurationDownloadRequested(string fileName, DownloadEventArgs args)
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{
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if (settings.AllowConfigurationDownloads)
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{
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logger.Debug($"Forwarding download request for configuration file '{fileName}'.");
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ConfigurationDownloadRequested?.Invoke(fileName, args);
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if (args.AllowDownload)
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{
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logger.Debug($"Download request for configuration file '{fileName}' was granted.");
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}
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else
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{
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logger.Debug($"Download request for configuration file '{fileName}' was denied.");
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messageBox.Show(TextKey.MessageBox_ReconfigurationDenied, TextKey.MessageBox_ReconfigurationDeniedTitle, parent: window);
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}
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}
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else
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{
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logger.Debug($"Discarded download request for configuration file '{fileName}'.");
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}
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}
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private void DownloadHandler_DownloadUpdated(DownloadItemState state)
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{
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window.UpdateDownloadState(state);
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}
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private void HomeNavigationRequested()
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{
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if (isMainInstance && (settings.UseStartUrlAsHomeUrl || !string.IsNullOrWhiteSpace(settings.HomeUrl)))
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{
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var navigate = false;
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var url = settings.UseStartUrlAsHomeUrl ? settings.StartUrl : settings.HomeUrl;
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if (settings.HomeNavigationRequiresPassword && !string.IsNullOrWhiteSpace(settings.HomePasswordHash))
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{
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var message = text.Get(TextKey.PasswordDialog_BrowserHomePasswordRequired);
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var title = !string.IsNullOrWhiteSpace(settings.HomeNavigationMessage) ? settings.HomeNavigationMessage : text.Get(TextKey.PasswordDialog_BrowserHomePasswordRequiredTitle);
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var dialog = uiFactory.CreatePasswordDialog(message, title);
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var result = dialog.Show(window);
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if (result.Success)
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{
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var passwordHash = hashAlgorithm.GenerateHashFor(result.Password);
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if (settings.HomePasswordHash.Equals(passwordHash, StringComparison.OrdinalIgnoreCase))
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{
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navigate = true;
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}
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else
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{
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messageBox.Show(TextKey.MessageBox_InvalidHomePassword, TextKey.MessageBox_InvalidHomePasswordTitle, icon: MessageBoxIcon.Warning, parent: window);
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}
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}
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}
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else
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{
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var message = text.Get(TextKey.MessageBox_BrowserHomeQuestion);
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var title = !string.IsNullOrWhiteSpace(settings.HomeNavigationMessage) ? settings.HomeNavigationMessage : text.Get(TextKey.MessageBox_BrowserHomeQuestionTitle);
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var result = messageBox.Show(message, title, MessageBoxAction.YesNo, MessageBoxIcon.Question, window);
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navigate = result == MessageBoxResult.Yes;
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}
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if (navigate)
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{
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control.NavigateTo(url);
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}
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}
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}
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private void KeyboardHandler_FindRequested()
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{
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if (settings.AllowFind)
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{
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window.ShowFindbar();
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}
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}
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private void LifeSpanHandler_PopupRequested(PopupRequestedEventArgs args)
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{
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var validCurrentUri = Uri.TryCreate(control.Address, UriKind.Absolute, out var currentUri);
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var validNewUri = Uri.TryCreate(args.Url, UriKind.Absolute, out var newUri);
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var sameHost = validCurrentUri && validNewUri && string.Equals(currentUri.Host, newUri.Host, StringComparison.OrdinalIgnoreCase);
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switch (settings.PopupPolicy)
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{
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case PopupPolicy.Allow:
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case PopupPolicy.AllowSameHost when sameHost:
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logger.Debug($"Forwarding request to open new window{(WindowSettings.UrlPolicy.CanLog() ? $" for '{args.Url}'" : "")}...");
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PopupRequested?.Invoke(args);
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break;
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case PopupPolicy.AllowSameWindow:
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case PopupPolicy.AllowSameHostAndWindow when sameHost:
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logger.Info($"Discarding request to open new window and loading{(WindowSettings.UrlPolicy.CanLog() ? $" '{args.Url}'" : "")} directly...");
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control.NavigateTo(args.Url);
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break;
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case PopupPolicy.AllowSameHost when !sameHost:
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case PopupPolicy.AllowSameHostAndWindow when !sameHost:
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logger.Info($"Blocked request to open new window{(WindowSettings.UrlPolicy.CanLog() ? $" for '{args.Url}'" : "")} as it targets a different host.");
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break;
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default:
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logger.Info($"Blocked request to open new window{(WindowSettings.UrlPolicy.CanLog() ? $" for '{args.Url}'" : "")}.");
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break;
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}
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}
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private void RequestHandler_QuitUrlVisited(string url)
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{
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Task.Run(() =>
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{
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if (settings.ResetOnQuitUrl)
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{
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logger.Info("Forwarding request to reset browser...");
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ResetRequested?.Invoke();
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}
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else
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{
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if (settings.ConfirmQuitUrl)
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{
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var message = text.Get(TextKey.MessageBox_BrowserQuitUrlConfirmation);
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var title = text.Get(TextKey.MessageBox_BrowserQuitUrlConfirmationTitle);
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var result = messageBox.Show(message, title, MessageBoxAction.YesNo, MessageBoxIcon.Question, window);
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var terminate = result == MessageBoxResult.Yes;
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if (terminate)
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{
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logger.Info($"User confirmed termination via quit URL{(WindowSettings.UrlPolicy.CanLog() ? $" '{url}'" : "")}, forwarding request...");
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TerminationRequested?.Invoke();
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}
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else
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{
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logger.Info($"User aborted termination via quit URL{(WindowSettings.UrlPolicy.CanLog() ? $" '{url}'" : "")}.");
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}
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}
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else
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{
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logger.Info($"Automatically requesting termination due to quit URL{(WindowSettings.UrlPolicy.CanLog() ? $" '{url}'" : "")}...");
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TerminationRequested?.Invoke();
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}
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}
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});
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}
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private void RequestHandler_RequestBlocked(string url)
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{
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Task.Run(() =>
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{
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var message = text.Get(TextKey.MessageBox_BrowserNavigationBlocked).Replace("%%URL%%", WindowSettings.UrlPolicy.CanLogError() ? url : "");
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var title = text.Get(TextKey.MessageBox_BrowserNavigationBlockedTitle);
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control.TitleChanged -= Control_TitleChanged;
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if (url.Equals(startUrl, StringComparison.OrdinalIgnoreCase))
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{
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window.UpdateTitle($"*** {title} ***");
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TitleChanged?.Invoke($"*** {title} ***");
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}
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messageBox.Show(message, title, parent: window);
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control.TitleChanged += Control_TitleChanged;
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});
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}
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private void ReloadRequested()
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{
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if (WindowSettings.AllowReloading && WindowSettings.ShowReloadWarning)
|
|
{
|
|
var result = messageBox.Show(TextKey.MessageBox_ReloadConfirmation, TextKey.MessageBox_ReloadConfirmationTitle, MessageBoxAction.YesNo, MessageBoxIcon.Question, window);
|
|
|
|
if (result == MessageBoxResult.Yes)
|
|
{
|
|
logger.Debug("The user confirmed reloading the current page...");
|
|
control.Reload();
|
|
}
|
|
else
|
|
{
|
|
logger.Debug("The user aborted reloading the current page.");
|
|
}
|
|
}
|
|
else if (WindowSettings.AllowReloading)
|
|
{
|
|
logger.Debug("Reloading current page...");
|
|
control.Reload();
|
|
}
|
|
else
|
|
{
|
|
logger.Debug("Blocked reload attempt, as the user is not allowed to reload web pages.");
|
|
}
|
|
}
|
|
|
|
private void Window_AddressChanged(string address)
|
|
{
|
|
var isValid = Uri.TryCreate(address, UriKind.Absolute, out _) || Uri.TryCreate($"https://{address}", UriKind.Absolute, out _);
|
|
|
|
if (isValid)
|
|
{
|
|
logger.Debug($"The user requested to navigate to '{address}', the URI is valid.");
|
|
control.NavigateTo(address);
|
|
}
|
|
else
|
|
{
|
|
logger.Debug($"The user requested to navigate to '{address}', but the URI is not valid.");
|
|
window.UpdateAddress(string.Empty);
|
|
}
|
|
}
|
|
|
|
private void Window_BackwardNavigationRequested()
|
|
{
|
|
logger.Debug("Navigating backwards...");
|
|
control.NavigateBackwards();
|
|
}
|
|
|
|
private void Window_Closing()
|
|
{
|
|
logger.Info($"Instance has terminated.");
|
|
control.Destroy();
|
|
Terminated?.Invoke(Id);
|
|
}
|
|
|
|
private void Window_DeveloperConsoleRequested()
|
|
{
|
|
logger.Debug("Showing developer console...");
|
|
control.ShowDeveloperConsole();
|
|
}
|
|
|
|
private void Window_FindRequested(string term, bool isInitial, bool caseSensitive, bool forward = true)
|
|
{
|
|
if (settings.AllowFind)
|
|
{
|
|
control.Find(term, isInitial, caseSensitive, forward);
|
|
}
|
|
}
|
|
|
|
private void Window_ForwardNavigationRequested()
|
|
{
|
|
logger.Debug("Navigating forwards...");
|
|
control.NavigateForwards();
|
|
}
|
|
|
|
private void ZoomInRequested()
|
|
{
|
|
if (settings.AllowPageZoom && CalculateZoomPercentage() < 300)
|
|
{
|
|
zoomLevel += ZOOM_FACTOR;
|
|
control.Zoom(zoomLevel);
|
|
window.UpdateZoomLevel(CalculateZoomPercentage());
|
|
logger.Debug($"Increased page zoom to {CalculateZoomPercentage()}%.");
|
|
}
|
|
}
|
|
|
|
private void ZoomOutRequested()
|
|
{
|
|
if (settings.AllowPageZoom && CalculateZoomPercentage() > 25)
|
|
{
|
|
zoomLevel -= ZOOM_FACTOR;
|
|
control.Zoom(zoomLevel);
|
|
window.UpdateZoomLevel(CalculateZoomPercentage());
|
|
logger.Debug($"Decreased page zoom to {CalculateZoomPercentage()}%.");
|
|
}
|
|
}
|
|
|
|
private void ZoomResetRequested()
|
|
{
|
|
if (settings.AllowPageZoom)
|
|
{
|
|
zoomLevel = 0;
|
|
control.Zoom(0);
|
|
window.UpdateZoomLevel(CalculateZoomPercentage());
|
|
logger.Debug($"Reset page zoom to {CalculateZoomPercentage()}%.");
|
|
}
|
|
}
|
|
|
|
private double CalculateZoomPercentage()
|
|
{
|
|
return (zoomLevel * 25.0) + 100.0;
|
|
}
|
|
}
|
|
}
|