91 lines
2.4 KiB
C#
91 lines
2.4 KiB
C#
/*
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* Copyright (c) 2019 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 CefSharp;
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using SafeExamBrowser.Browser.Events;
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using SafeExamBrowser.Browser.Filters;
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using SafeExamBrowser.Configuration.Contracts;
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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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namespace SafeExamBrowser.Browser.Handlers
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{
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internal class RequestHandler : CefSharp.Handler.RequestHandler
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{
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private RequestFilter filter;
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private ILogger logger;
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private ResourceHandler resourceHandler;
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private BrowserFilterSettings settings;
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internal event RequestBlockedEventHandler RequestBlocked;
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internal RequestHandler(AppConfig appConfig, BrowserFilterSettings settings, ILogger logger, IText text)
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{
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this.filter = new RequestFilter();
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this.logger = logger;
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this.resourceHandler = new ResourceHandler(appConfig, settings, filter, logger, text);
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this.settings = settings;
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}
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internal void Initiailize()
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{
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if (settings.FilterMainRequests || settings.FilterContentRequests)
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{
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InitializeFilter();
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}
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resourceHandler.Initialize();
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}
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protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser webBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
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{
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return resourceHandler;
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}
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protected override bool OnBeforeBrowse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool userGesture, bool isRedirect)
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{
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if (Block(request))
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{
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RequestBlocked?.Invoke(request.Url);
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return true;
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}
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return base.OnBeforeBrowse(chromiumWebBrowser, browser, frame, request, userGesture, isRedirect);
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}
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private bool Block(IRequest request)
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{
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if (settings.FilterMainRequests)
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{
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var result = filter.Process(request.Url);
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var block = result == FilterResult.Block;
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if (block)
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{
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logger.Info($"Blocked main request for '{request.Url}'.");
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}
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return block;
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}
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return false;
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}
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private void InitializeFilter()
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{
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foreach (var rule in settings.Rules)
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{
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filter.Load(rule);
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}
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logger.Debug($"Initialized request filter with {settings.Rules.Count} rules.");
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}
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}
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}
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