chore: original code.

This commit contains original code copied from edx-platform.
Purpose of keeping the first commit with original code is to get help in the review process.
Reviewer just needs to open the second commit and code changes will be clearly visible.

Author: farhan

.gitignore

@@ -23,6 +23,10 @@ __pycache__
 /lib
 /lib64
 
+# node
+node_modules
+npm-debug.log
+
 # Installer logs
 pip-log.txt
 

requirements/base.in

@@ -8,3 +8,7 @@ nh3
 oauthlib
 openedx-django-pyfs
 XBlock
+# TODO: Run python reqs update
+edx-opaque-keys
+edx-django-utils>=5.14.1
+edxval

xblocks_contrib/utils/__init__.py

@@ -0,0 +1,26 @@
+def display_name_with_default(block):
+    """
+    Calculates the display name for a block.
+
+    Default to the display_name if it isn't None, else fall back to creating
+    a name based on the URL.
+
+    Unlike the rest of this module's functions, this function takes an entire
+    course block/overview as a parameter. This is because a few test cases
+    (specifically, {Text|Image|Video}AnnotationModuleTestCase.test_student_view)
+    create scenarios where course.display_name is not None but course.location
+    is None, which causes calling course.url_name to fail. So, although we'd
+    like to just pass course.display_name and course.url_name as arguments to
+    this function, we can't do so without breaking those tests.
+
+    Note: This method no longer escapes as it once did, so the caller must
+    ensure it is properly escaped where necessary.
+
+    Arguments:
+        block (XModuleMixin|CourseOverview|BlockStructureBlockData):
+            Block that is being accessed
+    """
+    return (
+        block.display_name if block.display_name is not None
+        else block.scope_ids.usage_id.block_id.replace('_', ' ')
+    )