feat: Allow adding custom LTI parameters via LTI_CUSTOM_PARAMS django setting

Adds a new Django setting called `LTI_CUSTOM_PARAMS` that allows extending the
list of optional LTI parameters processed by the platform. These parameters can
be used by plugins for deeper platform integration.

(cherry picked from commit 0fde8c2)

Author: xitij2000

lms/djangoapps/lti_provider/tests/test_views.py

@@ -1,13 +1,12 @@
 """
 Tests for the LTI provider views
 """
-
-
 from unittest.mock import MagicMock, patch
 
 from django.contrib.auth.models import AnonymousUser
 from django.test import TestCase
 from django.test.client import RequestFactory
+from django.test.utils import override_settings
 from django.urls import reverse
 from opaque_keys.edx.locator import BlockUsageLocator, CourseLocator
 
@@ -121,6 +120,23 @@ def test_valid_launch_with_optional_params(self, _authenticate, store_params, _r
             self.consumer
         )
 
+    @patch('lms.djangoapps.lti_provider.views.render_courseware')
+    @patch('lms.djangoapps.lti_provider.views.store_outcome_parameters')
+    @patch('lms.djangoapps.lti_provider.views.authenticate_lti_user')
+    @override_settings(LTI_CUSTOM_PARAMS=["extra_param1", "extra_param2"])
+    def test_valid_launch_with_extra_params(self, _authenticate, store_params, _render):
+        """
+        Verifies that the LTI launch succeeds when passed a valid request.
+        """
+        extra_params = {'extra_param1': 'extra_value1', 'extra_param2': "extra_value2"}
+        request = build_launch_request(extra_post_data=LTI_OPTIONAL_PARAMS | extra_params)
+        views.lti_launch(request, str(COURSE_KEY), str(USAGE_KEY))
+        store_params.assert_called_with(
+            dict(list(ALL_PARAMS.items()) + list(LTI_OPTIONAL_PARAMS.items()) + list(extra_params.items())),
+            request.user,
+            self.consumer
+        )
+
     @patch('lms.djangoapps.courseware.views.views.render_xblock')
     @patch('lms.djangoapps.lti_provider.views.authenticate_lti_user')
     def test_render_xblock_params(self, _authenticate, render):

lms/djangoapps/lti_provider/views.py

@@ -18,6 +18,7 @@
 from lms.djangoapps.lti_provider.outcomes import store_outcome_parameters
 from lms.djangoapps.lti_provider.signature_validator import SignatureValidator
 from lms.djangoapps.lti_provider.users import authenticate_lti_user
+from openedx.core.djangoapps.site_configuration import helpers as configuration_helpers
 from openedx.core.lib.url_utils import unquote_slashes
 
 log = logging.getLogger("edx.lti_provider")
@@ -59,6 +60,7 @@ def lti_launch(request, course_id, usage_id):
     if not params:
         return HttpResponseBadRequest()
     params.update(get_optional_parameters(request.POST))
+    params.update(get_custom_parameters(request.POST))
 
     # Get the consumer information from either the instance GUID or the consumer
     # key
@@ -145,6 +147,22 @@ def get_optional_parameters(dictionary):
     return {key: dictionary[key] for key in OPTIONAL_PARAMETERS if key in dictionary}
 
 
+def get_custom_parameters(params: dict[str]) -> dict[str]:
+    """
+    Extract all optional LTI parameters from a dictionary. This method does not
+    fail if any parameters are missing.
+
+    :param params: A dictionary containing zero or more parameters.
+    :return: A new dictionary containing all optional parameters from the
+        original dictionary, or an empty dictionary if no optional parameters
+        were present.
+    """
+    custom_params = configuration_helpers.get_value("LTI_CUSTOM_PARAMS", settings.LTI_CUSTOM_PARAMS)
+    if not custom_params:
+        return {}
+    return {key: params[key] for key in custom_params if key in params}
+
+
 def render_courseware(request, usage_key):
     """
     Render the content requested for the LTI launch.

lms/envs/common.py

@@ -4450,6 +4450,16 @@ def _make_locale_paths(settings):  # pylint: disable=missing-function-docstring
 # The time value is in seconds.
 LTI_AGGREGATE_SCORE_PASSBACK_DELAY = 15 * 60
 
+
+# .. setting_name: LTI_CUSTOM_PARAMS
+# .. setting_default: []
+# .. setting_description: This expands the list of optional LTI parameters that the
+#    platform accepts. These parameters are not used by the platform, but can then
+#    be used by other plugins.
+# .. setting_creation_date: 2025-08-22
+# .. setting_tickets:
+LTI_CUSTOM_PARAMS = []
+
 # Credit notifications settings
 NOTIFICATION_EMAIL_CSS = "templates/credit_notifications/credit_notification.css"
 NOTIFICATION_EMAIL_EDX_LOGO = "templates/credit_notifications/edx-logo-header.png"