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s3-lifecycle
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s3-lifecycle
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#!/usr/bin/python3
# For example: ./s3-lifecycle --days 90 https://cockpit-logs.us-east-1.linodeobjects.com/
# NB: The policy gets applied once daily, at midnight.
import argparse
import base64
import hashlib
import logging
import textwrap
import urllib
from pathlib import Path
from lib import s3
def main() -> None:
parser = argparse.ArgumentParser(description='Gets (default) or sets (--days, --file) S3 lifecycle policy')
group = parser.add_mutually_exclusive_group()
group.add_argument('--days', type=int, help='Set a simple expiry policy, in days')
group.add_argument('--file', type=Path, help='Set the expiry policy from the given XML file')
parser.add_argument('url', metavar='URL', help='The S3 URL to set the policy on')
args = parser.parse_args()
lifecycle = urllib.parse.urlparse(args.url)._replace(query='lifecycle=')
if args.days:
# https://www.linode.com/docs/products/storage/object-storage/guides/lifecycle-policies/
xml = textwrap.dedent(f"""
<LifecycleConfiguration>
<Rule>
<ID>delete-all-objects</ID>
<Filter>
<Prefix></Prefix>
</Filter>
<Status>Enabled</Status>
<Expiration>
<Days>{args.days}</Days>
</Expiration>
</Rule>
</LifecycleConfiguration>""")
elif args.file:
xml = args.file.read_text()
else:
with s3.urlopen(lifecycle) as response:
print(response.read())
return
# For some reason this request requires Content-MD5, even though we also SHA256 the body...
data = xml.encode('ascii')
md5 = hashlib.md5()
md5.update(data)
headers = {'Content-MD5': base64.b64encode(md5.digest()).decode('ascii')}
with s3.urlopen(lifecycle, method='PUT', headers=headers, data=data) as response:
print(response.status)
if __name__ == '__main__':
logging.basicConfig(level=logging.DEBUG)
main()