Bulk undelete of versioned s3 objects

s3_undelete.py

#!/usr/bin/env python
import json
from datetime import datetime

from boto3 import Session

BUCKET_NAME = "my-sweet-bucket"
prefix = 'my-sweet-dir'

session = Session(region_name='us-east-1', profile_name='my.sweet.profile.name')
bucket = session.client('s3')
MAX_KEYS = 10000


def get_bucket_versions(version_id, key):
    return bucket.list_object_versions(Bucket=BUCKET_NAME,
                                       MaxKeys=MAX_KEYS,
                                       Prefix=prefix,
                                       VersionIdMarker=version_id,
                                       KeyMarker=key)


class DateTimeEncoder(json.JSONEncoder):
    def default(self, o):
        if isinstance(o, datetime):
            return o.isoformat()
        return json.JSONEncoder.default(self, o)


def objects_to_restore(versions):
    return [
        {
            'VersionId': marker['VersionId'],
            'Key': marker['Key']
        } for marker in versions.get('DeleteMarkers') if marker['IsLatest']
    ]


def restore_s3_objects(version_markers, count):
    markers_to_delete = objects_to_restore(version_markers)
    print(f"Will restore {len(markers_to_delete)} items during request number: {count}")
    if not markers_to_delete:
        return 0
    bucket.delete_objects(Bucket=BUCKET_NAME, Delete={'Objects': markers_to_delete})
    return len(markers_to_delete)


obj_list = bucket.list_object_versions(Bucket=BUCKET_NAME,
                                       MaxKeys=MAX_KEYS,
                                       Prefix=prefix)
_next_version_id = obj_list.get('NextVersionIdMarker')
_next_key_marker = obj_list.get('NextKeyMarker')

counter = 1
total_restored = restore_s3_objects(obj_list, counter)

while _next_version_id and _next_key_marker:
    counter += 1
    another_list_of_versions = get_bucket_versions(_next_version_id, _next_key_marker)
    _next_version_id = another_list_of_versions.get('NextVersionIdMarker')
    _next_key_marker = another_list_of_versions.get('NextKeyMarker')
    total_restored += restore_s3_objects(another_list_of_versions, counter)

print(f"Total Restored: {total_restored}")

ciao and thanks for this really usefull script.
Just a question : i' m really basic with python but i'm trying anyway without success until now to add another filter just to delete all the "delete marker" placeholder filtered by datetime.
I strted to work with the json field "LastModified" but i 'm still far away from the solution
may be can you help me ?

ciao and regards
Germano