feat: Add course-wide custom scripts

Imlements OEP-15 by adding two fields to the course settings:
- Course-wide Custom JS
- Course-wide Custom CSS
The resources defined in these fields will be rendered in all course pages.

Rebase b6cb629..0578e1c4c6 onto b6cb629:
- Add course-wide resources to API for MFE use
- Revert "Add course-wide resources to API for MFE use" reverts commit 53648dcf0afe3cd171c9dc2eb5e56b871b2bcfb2

Signed-off-by: Gabor Boros <gabor.brs@gmail.com>

common/lib/xmodule/xmodule/course_module.py

@@ -998,6 +998,19 @@ class CourseFields:  # lint-amnesty, pylint: disable=missing-class-docstring
         ),
         scope=Scope.settings, default=False
     )
+
+    course_wide_js = List(
+        display_name=_("Course-wide Custom JS"),
+        help=_('Enter Javascript resource URLs you want to be loaded globally throughout the course pages.'),
+        scope=Scope.settings,
+    )
+
+    course_wide_css = List(
+        display_name=_("Course-wide Custom CSS"),
+        help=_('Enter CSS resource URLs you want to be loaded globally throughout the course pages.'),
+        scope=Scope.settings,
+    )
+
     other_course_settings = Dict(
         display_name=_("Other Course Settings"),
         help=_(

lms/djangoapps/courseware/tests/test_views.py

@@ -6,6 +6,7 @@
 import html
 import itertools
 import json
+import re
 from datetime import datetime, timedelta
 from uuid import uuid4
 
@@ -65,6 +66,7 @@
 from lms.djangoapps.courseware.user_state_client import DjangoXBlockUserStateClient
 from lms.djangoapps.grades.config.waffle import ASSUME_ZERO_GRADE_IF_ABSENT
 from lms.djangoapps.grades.config.waffle import waffle_switch as grades_waffle_switch
+from lms.djangoapps.instructor.access import allow_access
 from lms.djangoapps.verify_student.models import VerificationDeadline
 from lms.djangoapps.verify_student.services import IDVerificationService
 from openedx.core.djangoapps.catalog.tests.factories import CourseFactory as CatalogCourseFactory
@@ -3743,3 +3745,64 @@ def test_mathjax_detection_disabled(self):
         response = self.client.get(url)
         assert response.status_code == 200
         assert b"MathJax.Hub.Config" in response.content
+
+
+@ddt.ddt
+class TestCourseWideResources(ModuleStoreTestCase):
+    """
+    Tests that custom course-wide resources are rendered in course pages
+    """
+
+    @ddt.data(
+        ('courseware', 'course_id', False, True),
+        ('dates', 'course_id', False, False),
+        ('progress', 'course_id', False, False),
+        ('instructor_dashboard', 'course_id', True, False),
+        ('forum_form_discussion', 'course_id', False, False),
+        ('render_xblock', 'usage_key_string', False, True),
+    )
+    @ddt.unpack
+    def test_course_wide_resources(self, url_name, param, is_instructor, is_rendered):
+        """
+        Tests that the <script> and <link> tags are created for course-wide custom resources.
+        Also, test that the order which the resources are added match the given order.
+        """
+        user = UserFactory()
+
+        js = ['/test.js', 'https://testcdn.com/js/lib.min.js', '//testcdn.com/js/lib2.js']
+        css = ['https://testcdn.com/css/lib.min.css', '//testcdn.com/css/lib2.css', '/test.css']
+
+        course = CourseFactory.create(course_wide_js=js, course_wide_css=css)
+        chapter = ItemFactory.create(parent=course, category='chapter')
+        sequence = ItemFactory.create(parent=chapter, category='sequential', display_name='Sequence')
+
+        CourseOverview.load_from_module_store(course.id)
+        CourseEnrollmentFactory(user=user, course_id=course.id)
+        if is_instructor:
+            allow_access(course, user, 'instructor')
+        assert self.client.login(username=user.username, password='test')
+
+        kwargs = None
+        if param == 'course_id':
+            kwargs = {'course_id': str(course.id)}
+        elif param == 'usage_key_string':
+            kwargs = {'usage_key_string': str(sequence.location)}
+        response = self.client.get(reverse(url_name, kwargs=kwargs))
+
+        content = response.content.decode('utf-8')
+        js_match = [re.search(f'<script .*src=[\'"]{j}[\'"].*>', content) for j in js]
+        css_match = [re.search(f'<link .*href=[\'"]{c}[\'"].*>', content) for c in css]
+
+        # custom resources are included
+        if is_rendered:
+            assert None not in js_match
+            assert None not in css_match
+
+            # custom resources are added in order
+            for i in range(len(js) - 1):
+                assert js_match[i].start() < js_match[i + 1].start()
+            for i in range(len(css) - 1):
+                assert css_match[i].start() < css_match[i + 1].start()
+        else:
+            assert js_match == [None, None, None]
+            assert css_match == [None, None, None]

lms/djangoapps/courseware/views/index.py

@@ -444,7 +444,8 @@ def _create_courseware_context(self, request):
             'section_title': None,
             'sequence_title': None,
             'disable_accordion': not DISABLE_COURSE_OUTLINE_PAGE_FLAG.is_enabled(self.course.id),
-            'show_search': show_search
+            'show_search': show_search,
+            'render_course_wide_assets': True,
         }
         courseware_context.update(
             get_experiment_user_metadata_context(

lms/djangoapps/courseware/views/views.py

@@ -1806,6 +1806,7 @@ def render_xblock(request, usage_key_string, check_if_enrolled=True):
             'is_learning_mfe': is_learning_mfe,
             'is_mobile_app': is_request_from_mobile_app(request),
             'reset_deadlines_url': reverse(RESET_COURSE_DEADLINES_NAME),
+            'render_course_wide_assets': True,
 
             **optimization_flags,
         }

lms/templates/main.html

@@ -171,6 +171,11 @@
     </script>
 % endif
 
+  % if course and course is not UNDEFINED and render_course_wide_assets:
+  % for css in course.course_wide_css:
+    <link rel="stylesheet" href="${css}" type="text/css">
+  % endfor
+  % endif
 </head>
 
 <body class="${static.dir_rtl()} <%block name='bodyclass'/> lang_${LANGUAGE_CODE}">
@@ -215,6 +220,12 @@
   <%static:optional_include_mako file="body-extra.html" is_theming_enabled="True" />
   <script type="text/javascript" src="${static.url('js/src/jquery_extend_patch.js')}"></script>
   <div id="lean_overlay"></div>
+
+  % if course and course is not UNDEFINED and render_course_wide_assets:
+  % for js in course.course_wide_js:
+  <script type="text/javascript" src="${js}"></script>
+  % endfor
+  % endif
 </body>
 </html>
 

lms/templates/main_django.html

@@ -20,6 +20,12 @@
   {% block headextra %}{% endblock %}
   {% render_block "css" %}
 
+  {% if request.course and request.render_course_wide_assets %}
+  {% for css in request.course.course_wide_css %}
+  <link rel="stylesheet" href="{{css}}" type="text/css">
+  {% endfor %}
+  {% endif %}
+
   {% optional_include "head-extra.html"|microsite_template_path %}
 
   <meta name="path_prefix" content="{{EDX_ROOT_URL}}">
@@ -46,6 +52,12 @@
     {% javascript 'base_application' %}
 
     {% render_block "js" %}
+
+    {% if request.course and request.render_course_wide_assets %}
+    {% for js in request.course.course_wide_js %}
+    <script type="text/javascript" src="{{js}}"></script>
+    {% endfor %}
+    {% endif %}
 </body>
 </html>