Restore SEBPatch

SafeExamBrowser.Configuration/DataResources/FileResourceSaver.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;
+using System.IO;
+using SafeExamBrowser.Configuration.Contracts;
+using SafeExamBrowser.Configuration.Contracts.DataResources;
+using SafeExamBrowser.Logging.Contracts;
+
+namespace SafeExamBrowser.Configuration.DataResources
+{
+	public class FileResourceSaver : IResourceSaver
+	{
+		private ILogger logger;
+
+		public FileResourceSaver(ILogger logger)
+		{
+			this.logger = logger;
+		}
+
+		public bool CanSave(Uri destination)
+		{
+			var isFullPath = destination.IsFile && Path.IsPathRooted(destination.LocalPath);
+
+			if (isFullPath)
+			{
+				logger.Debug($"Can save data as '{destination}' since it defines an absolute file path.");
+			}
+			else
+			{
+				logger.Debug($"Can't save data as '{destination}' since it doesn't define an absolute file path.");
+			}
+
+			return isFullPath;
+		}
+
+		public SaveStatus TrySave(Uri destination, Stream data)
+		{
+			var directory = Path.GetDirectoryName(destination.LocalPath);
+
+			logger.Debug($"Attempting to save '{data}' with {data.Length / 1000.0} KB data as '{destination}'...");
+
+			if (!Directory.Exists(directory))
+			{
+				logger.Debug($"Creating directory '{directory}'...");
+				Directory.CreateDirectory(directory);
+			}
+
+			using (var fileStream = new FileStream(destination.LocalPath, FileMode.Create))
+			{
+				data.Seek(0, SeekOrigin.Begin);
+				data.CopyTo(fileStream);
+			}
+
+			logger.Debug($"Successfully saved data as '{destination}'.");
+
+			return SaveStatus.Success;
+		}
+	}
+}