Restore SEBPatch

SafeExamBrowser.Server/FileSystem.cs

@@ -0,0 +1,59 @@
+/*
+ * 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;
+using System.IO;
+using System.Net.Http;
+using System.Threading.Tasks;
+using SafeExamBrowser.Configuration.Contracts;
+using SafeExamBrowser.Logging.Contracts;
+
+namespace SafeExamBrowser.Server
+{
+	internal class FileSystem
+	{
+		private readonly AppConfig appConfig;
+		private readonly ILogger logger;
+
+		internal FileSystem(AppConfig appConfig, ILogger logger)
+		{
+			this.appConfig = appConfig;
+			this.logger = logger;
+		}
+
+		internal bool TrySaveFile(HttpContent content, out Uri uri)
+		{
+			uri = new Uri(Path.Combine(appConfig.TemporaryDirectory, $"ServerExam{appConfig.ConfigurationFileExtension}"));
+
+			try
+			{
+				var task = Task.Run(async () =>
+				{
+					return await content.ReadAsStreamAsync();
+				});
+
+				using (var data = task.GetAwaiter().GetResult())
+				using (var file = new FileStream(uri.LocalPath, FileMode.Create))
+				{
+					data.Seek(0, SeekOrigin.Begin);
+					data.CopyTo(file);
+					data.Flush();
+					file.Flush();
+				}
+
+				return true;
+			}
+			catch (Exception e)
+			{
+				logger.Error($"Failed to save file '{uri.LocalPath}'!", e);
+			}
+
+			return false;
+		}
+	}
+}