46 lines
1.9 KiB
Python
46 lines
1.9 KiB
Python
"""
|
|
Common utility functions related to courses.
|
|
"""
|
|
from django.conf import settings
|
|
|
|
from xmodule.assetstore.assetmgr import AssetManager
|
|
from xmodule.contentstore.content import StaticContent
|
|
from xmodule.contentstore.django import contentstore
|
|
|
|
|
|
def course_image_url(course, image_key='course_image'):
|
|
"""Try to look up the image url for the course. If it's not found,
|
|
log an error and return the dead link.
|
|
image_key can be one of the three: 'course_image', 'hero_image', 'thumbnail_image' """
|
|
if course.static_asset_path:
|
|
# If we are a static course with the image_key attribute
|
|
# set different than the default, return that path so that
|
|
# courses can use custom course image paths, otherwise just
|
|
# return the default static path.
|
|
url = '/static/' + (course.static_asset_path or getattr(course, 'data_dir', ''))
|
|
if hasattr(course, image_key) and getattr(course, image_key) != course.fields[image_key].default:
|
|
url += '/' + getattr(course, image_key)
|
|
else:
|
|
url += '/images/' + image_key + '.jpg'
|
|
elif not getattr(course, image_key):
|
|
# if image_key is empty, use the default image url from settings
|
|
url = settings.STATIC_URL + settings.DEFAULT_COURSE_ABOUT_IMAGE_URL
|
|
else:
|
|
loc = StaticContent.compute_location(course.id, getattr(course, image_key))
|
|
url = StaticContent.serialize_asset_key_with_slash(loc)
|
|
|
|
return url
|
|
|
|
|
|
def create_course_image_thumbnail(course, dimensions):
|
|
"""Create a course image thumbnail and return the URL.
|
|
|
|
- dimensions is a tuple of (width, height)
|
|
"""
|
|
course_image_asset_key = StaticContent.compute_location(course.id, course.course_image)
|
|
course_image = AssetManager.find(course_image_asset_key) # a StaticContent obj
|
|
|
|
_content, thumb_loc = contentstore().generate_thumbnail(course_image, dimensions=dimensions)
|
|
|
|
return StaticContent.serialize_asset_key_with_slash(thumb_loc)
|