Missing files + start working on offline patcher

SafeExamBrowser.Server/Requests/FinishHandshakeRequest.cs

@@ -0,0 +1,37 @@
+/*
+ * 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.Net.Http;
+using SafeExamBrowser.Logging.Contracts;
+using SafeExamBrowser.Server.Data;
+using SafeExamBrowser.Settings.Server;
+
+namespace SafeExamBrowser.Server.Requests
+{
+	internal class FinishHandshakeRequest : Request
+	{
+		internal FinishHandshakeRequest(
+			Api api,
+			HttpClient httpClient,
+			ILogger logger,
+			Parser parser,
+			ServerSettings settings) : base(api, httpClient, logger, parser, settings)
+		{
+		}
+
+		internal bool TryExecute(out string message, string appSignatureKey = default)
+		{
+			var content = appSignatureKey != default ? $"seb_signature_key={appSignatureKey}" : default;
+			var success = TryExecute(HttpMethod.Put, api.HandshakeEndpoint, out var response, content, ContentType.URL_ENCODED, Authorization, Token);
+
+			message = response.ToLogString();
+
+			return success;
+		}
+	}
+}