if cover_url.startswith('file://'):
cover_url = ctx.files_path + urllib.quote(cover_url[7:])
IMG_EXT = ('png', 'jpg', 'jpeg', 'gif')
if cover_url.startswith('file://'):
cover_url = ctx.files_path + urllib.quote(cover_url[7:])
IMG_EXT = ('png', 'jpg', 'jpeg', 'gif')