Expose access denial reasons inside verticals to the front-end on the course outline

openedx/features/course_experience/templates/course_experience/course-outline-fragment.html

@@ -5,6 +5,7 @@
 <%namespace name='static' file='../static_content.html'/>
 
 <%!
+import json
 from datetime import date
 
 from django.utils.translation import ugettext as _
@@ -164,8 +165,9 @@ self_paced = context.get('self_paced', False)
                         if vertical_is_access_denied:
                             continue
                         scored = 'scored' if vertical.get('scored', False) else ''
+                        access_restricted = list(vertical.get('all_denial_reasons', []))
                         %>
-                                    <li class="vertical outline-item focusable ${scored}">
+                                    <li class="vertical outline-item focusable ${scored}" data-access-denied="${json.dumps(access_restricted)}">
                                         <a class="outline-item focusable"
                                             % if enable_links:
                                                 href="${ vertical['lms_web_url'] }"

openedx/features/course_experience/utils.py

@@ -146,6 +146,20 @@ def get_course_outline_block_tree(request, course_id, user=None):
             block['scored'] = False
             return False
 
+    def recurse_mark_auth_denial(block):
+        """
+        Mark this block as 'scored' if any of its descendents are 'scored' (that is, 'has_score' and 'weight' > 0).
+        """
+        own_denial_reason = {block['authorization_denial_reason']} if 'authorization_denial_reason' in block else set()
+        # Use a list comprehension to force the recursion over all children, rather than just stopping
+        # at the first child that is scored.
+        child_denial_reasons = own_denial_reason.union(
+            *(recurse_mark_auth_denial(child) for child in block.get('children', []))
+        )
+        if child_denial_reasons:
+            block['all_denial_reasons'] = child_denial_reasons
+        return child_denial_reasons
+
     course_key = CourseKey.from_string(course_id)
     course_usage_key = modulestore().make_course_usage_key(course_key)
 
@@ -188,6 +202,7 @@ def get_course_outline_block_tree(request, course_id, user=None):
     if course_outline_root_block:
         populate_children(course_outline_root_block, all_blocks['blocks'])
         recurse_mark_scored(course_outline_root_block)
+        recurse_mark_auth_denial(course_outline_root_block)
         if user:
             set_last_accessed_default(course_outline_root_block)
             mark_blocks_completed(