Missing files + start working on offline patcher

SafeExamBrowser.Proctoring/ScreenProctoring/Service/Sanitizer.cs

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2025 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.Reflection;
+
+namespace SafeExamBrowser.Proctoring.ScreenProctoring.Service
+{
+	internal class Sanitizer
+	{
+		internal Uri Sanitize(string serviceUrl)
+		{
+			return new Uri(serviceUrl.EndsWith("/") ? serviceUrl : $"{serviceUrl}/");
+		}
+
+		internal void Sanitize(Api api)
+		{
+			foreach (var property in api.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
+			{
+				var value = property.GetValue(api) as string;
+				var sanitized = value.TrimStart('/');
+
+				property.SetValue(api, sanitized);
+			}
+		}
+	}
+}