Restore SEBPatch

SafeExamBrowser.Browser/Handlers/RenderProcessMessageHandler.cs

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+/*
+ * 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 CefSharp;
+using SafeExamBrowser.Browser.Content;
+using SafeExamBrowser.Configuration.Contracts;
+using SafeExamBrowser.Configuration.Contracts.Cryptography;
+using SafeExamBrowser.I18n.Contracts;
+using BrowserSettings = SafeExamBrowser.Settings.Browser.BrowserSettings;
+
+namespace SafeExamBrowser.Browser.Handlers
+{
+	internal class RenderProcessMessageHandler : IRenderProcessMessageHandler
+	{
+		private readonly AppConfig appConfig;
+		private readonly Clipboard clipboard;
+		private readonly ContentLoader contentLoader;
+		private readonly IKeyGenerator keyGenerator;
+		private readonly BrowserSettings settings;
+		private readonly IText text;
+
+		internal RenderProcessMessageHandler(AppConfig appConfig, Clipboard clipboard, IKeyGenerator keyGenerator, BrowserSettings settings, IText text)
+		{
+			this.appConfig = appConfig;
+			this.clipboard = clipboard;
+			this.contentLoader = new ContentLoader(text);
+			this.keyGenerator = keyGenerator;
+			this.settings = settings;
+			this.text = text;
+		}
+
+		public void OnContextCreated(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame)
+		{
+			var browserExamKey = keyGenerator.CalculateBrowserExamKeyHash(settings.ConfigurationKey, settings.BrowserExamKeySalt, frame.Url);
+			var configurationKey = keyGenerator.CalculateConfigurationKeyHash(settings.ConfigurationKey, frame.Url);
+			var api = contentLoader.LoadApi(browserExamKey, configurationKey, appConfig.ProgramBuildVersion);
+			var clipboardScript = contentLoader.LoadClipboard();
+			var pageZoomScript = contentLoader.LoadPageZoom();
+
+			frame.ExecuteJavaScriptAsync(api);
+
+			if (!settings.AllowPageZoom)
+			{
+				frame.ExecuteJavaScriptAsync(pageZoomScript);
+			}
+
+			if (!settings.AllowPrint)
+			{
+				frame.ExecuteJavaScriptAsync($"window.print = function() {{ alert('{text.Get(TextKey.Browser_PrintNotAllowed)}') }}");
+			}
+
+			if (settings.UseIsolatedClipboard)
+			{
+				frame.ExecuteJavaScriptAsync(clipboardScript);
+
+				if (clipboard.Content != default)
+				{
+					frame.ExecuteJavaScriptAsync($"SafeExamBrowser.clipboard.update('', '{clipboard.Content}');");
+				}
+			}
+		}
+
+		public void OnContextReleased(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame)
+		{
+		}
+
+		public void OnFocusedNodeChanged(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IDomNode node)
+		{
+		}
+
+		public void OnUncaughtException(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, JavascriptException exception)
+		{
+		}
+	}
+}