this

lti/adapters.py

@@ -77,7 +77,13 @@ class DjangoMessageLaunch:
         """Validate the LTI launch message"""
         from pylti1p3.message_launch import MessageLaunch
 
-        message_launch = MessageLaunch(self.lti_request, self.tool_config, session_service=self.launch_data_storage, cookie_service=self.launch_data_storage)
+        # Create custom MessageLaunch that properly implements _get_request_param
+        class CustomMessageLaunch(MessageLaunch):
+            def _get_request_param(self, key):
+                """Override to properly get request parameters"""
+                return self._request.get_param(key)
+
+        message_launch = CustomMessageLaunch(self.lti_request, self.tool_config, session_service=self.launch_data_storage, cookie_service=self.launch_data_storage)
 
         return message_launch
 

lti/views.py

@@ -219,7 +219,14 @@ class LaunchView(View):
             # Validate JWT and get launch data
             session_service = DjangoSessionService(request)
             cookie_service = DjangoSessionService(request)
-            message_launch = MessageLaunch(lti_request, tool_config, session_service=session_service, cookie_service=cookie_service)
+
+            # Create custom MessageLaunch that properly implements _get_request_param
+            class CustomMessageLaunch(MessageLaunch):
+                def _get_request_param(self, key):
+                    """Override to properly get request parameters"""
+                    return self._request.get_param(key)
+
+            message_launch = CustomMessageLaunch(lti_request, tool_config, session_service=session_service, cookie_service=cookie_service)
 
             # Get validated launch data
             launch_data = message_launch.get_launch_data()