in backend/lambda/app.py [0:0]
def generate_presigned_urls(s3_uris):
presigned_urls = [s3_client.generate_presigned_url(
'get_object',
Params={
'Bucket': urlparse(x).netloc,
'Key': urlparse(x).path.lstrip('/')},
ExpiresIn=300
) for x in s3_uris]
return presigned_urls