From a33c7c0ff9a14db4f9cc9684ad5d365c1588768c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Damian=20B=C3=BCchel?= <damian.buechel@let.ethz.ch>
Date: Wed, 21 Apr 2021 19:53:52 +0200
Subject: [PATCH] SEBWIN-483: Implemented generic method to retrieve LMS
 session identifier.

---
 .../Handlers/ResourceHandler.cs               | 29 +++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/SafeExamBrowser.Browser/Handlers/ResourceHandler.cs b/SafeExamBrowser.Browser/Handlers/ResourceHandler.cs
index 48f3475e..930a71c1 100644
--- a/SafeExamBrowser.Browser/Handlers/ResourceHandler.cs
+++ b/SafeExamBrowser.Browser/Handlers/ResourceHandler.cs
@@ -246,8 +246,33 @@ namespace SafeExamBrowser.Browser.Handlers
 
 		private void SearchSessionIdentifiers(IRequest request, IResponse response)
 		{
-			SearchEdxIdentifier(response);
-			SearchMoodleIdentifier(request, response);
+			var success = TrySearchGenericSessionIdentifier(response);
+
+			if (!success)
+			{
+				SearchEdxIdentifier(response);
+				SearchMoodleIdentifier(request, response);
+			}
+		}
+
+		private bool TrySearchGenericSessionIdentifier(IResponse response)
+		{
+			var ids = response.Headers.GetValues("X-LMS-USER-ID");
+
+			if (ids != default(string[]))
+			{
+				var userId = ids.FirstOrDefault();
+
+				if (userId != default(string))
+				{
+					Task.Run(() => SessionIdentifierDetected?.Invoke(userId));
+					logger.Info("Generic LMS session detected.");
+
+					return true;
+				}
+			}
+
+			return false;
 		}
 
 		private void SearchEdxIdentifier(IResponse response)