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import os
import secrets
from django.utils import timezone
def upload_namer(prefix, instance, filename):
"""
Names uploaded images, obscuring their original name with a random UUID.
"""
now = timezone.now()
_, old_extension = os.path.splitext(filename)
new_filename = secrets.token_urlsafe(20)
return f"{prefix}/{now.year}/{now.month}/{now.day}/{new_filename}{old_extension}"
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