Update Safe Exam Browser Patch to 3.10.0.826

SafeExamBrowser.Browser/Integrations/EdxIntegration.cs

@@ -0,0 +1,75 @@
+/*
+ * 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.Linq;
+using CefSharp;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using SafeExamBrowser.Logging.Contracts;
+
+namespace SafeExamBrowser.Browser.Integrations
+{
+	internal class EdxIntegration : Integration
+	{
+		private readonly ILogger logger;
+
+		public EdxIntegration(ILogger logger)
+		{
+			this.logger = logger;
+		}
+
+		internal override bool TrySearchUserIdentifier(Cookie cookie, out string userIdentifier)
+		{
+			userIdentifier = default;
+
+			return false;
+		}
+
+		internal override bool TrySearchUserIdentifier(IRequest request, IResponse response, out string userIdentifier)
+		{
+			var cookies = response.Headers.GetValues("Set-Cookie");
+			var userInfo = cookies?.FirstOrDefault(c => c.Contains("edx-user-info"));
+
+			userIdentifier = default;
+
+			if (TryParseCookie(userInfo, out var id) && HasChanged(id))
+			{
+				userIdentifier = id;
+				logger.Info($"User identifier '{id}' detected by session cookie on response.");
+			}
+
+			return userIdentifier != default;
+		}
+
+		private bool TryParseCookie(string userInfo, out string userIdentifier)
+		{
+			userIdentifier = default;
+
+			try
+			{
+				if (userInfo != default)
+				{
+					var start = userInfo.IndexOf("=") + 1;
+					var end = userInfo.IndexOf("; expires");
+					var cookie = userInfo.Substring(start, end - start);
+					var sanitized = cookie.Replace("\\\"", "\"").Replace("\\054", ",").Trim('"');
+					var json = JsonConvert.DeserializeObject(sanitized) as JObject;
+
+					userIdentifier = json["username"].Value<string>();
+				}
+			}
+			catch (Exception e)
+			{
+				logger.Error("Failed to parse user identifier!", e);
+			}
+
+			return userIdentifier != default;
+		}
+	}
+}