Restore SEBPatch

SafeExamBrowser.I18n/XmlTextResource.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.Collections.Generic;
+using System.IO;
+using System.Xml.Linq;
+using SafeExamBrowser.I18n.Contracts;
+
+namespace SafeExamBrowser.I18n
+{
+	/// <summary>
+	/// Default implementation of an <see cref="ITextResource"/> for text data in XML.
+	/// </summary>
+	public class XmlTextResource : ITextResource
+	{
+		private Stream data;
+
+		/// <summary>
+		/// Initializes a new text resource for an XML data stream.
+		/// </summary>
+		/// <exception cref="ArgumentNullException">If the given stream is null.</exception>
+		public XmlTextResource(Stream data)
+		{
+			this.data = data ?? throw new ArgumentNullException(nameof(data));
+		}
+
+		public IDictionary<TextKey, string> LoadText()
+		{
+			var xml = XDocument.Load(data);
+			var text = new Dictionary<TextKey, string>();
+
+			foreach (var definition in xml.Root.Descendants())
+			{
+				var isEntry = definition.Name.LocalName == "Entry";
+				var hasValidKey = Enum.TryParse(definition.Attribute("key")?.Value, out TextKey key);
+
+				if (isEntry && hasValidKey)
+				{
+					text[key] = definition.Value?.Trim() ?? string.Empty;
+				}
+			}
+
+			return text;
+		}
+	}
+}