Restore SEBPatch

SafeExamBrowser.Browser/Handlers/DialogHandler.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 System.Collections.Generic;
+using System.Threading.Tasks;
+using CefSharp;
+using SafeExamBrowser.Browser.Events;
+using SafeExamBrowser.Browser.Wrapper;
+
+namespace SafeExamBrowser.Browser.Handlers
+{
+	internal class DialogHandler : IDialogHandler
+	{
+		internal event DialogRequestedEventHandler DialogRequested;
+
+		public bool OnFileDialog(IWebBrowser webBrowser, IBrowser browser, CefFileDialogMode mode, string title, string defaultFilePath, List<string> acceptFilters, IFileDialogCallback callback)
+		{
+			var args = new DialogRequestedEventArgs
+			{
+				Element = mode.ToElement(),
+				InitialPath = defaultFilePath,
+				Operation = mode.ToOperation(),
+				Title = title
+			};
+
+			Task.Run(() =>
+			{
+				DialogRequested?.Invoke(args);
+
+				using (callback)
+				{
+					if (args.Success)
+					{
+						callback.Continue(new List<string> { args.FullPath });
+					}
+					else
+					{
+						callback.Cancel();
+					}
+				}
+			});
+
+			return true;
+		}
+	}
+}