zip-some-s3-files.py

import io
import boto3
import datetime

from zipfile import ZipFile
from dateutil.tz import tzutc

from botocore.config import Config

outfile = sys.argv[1]
fromdate = datetime.datetime(2020, 5, 7, 0, 0, 0, tzinfo=tzutc())
bucket = 'endlesspit'
prefix = 'somefiles/'


class Buf(io.BytesIO):
    def getAndReset(self):
        try:
           return self.getvalue()
        finally:
           self.seek(0)
           self.truncate()


b = boto3.resource('s3', config=Config(
   retries = {
      'max_attempts': 10,
      'mode': 'adaptive'
   }
)
).Bucket(bucket)

buf = Buf()
with ZipFile(outfile, 'w') as zf:
    for i in b.objects.filter(Prefix=prefix):
        if i.last_modified >= fromdate:
            i.Object().download_fileobj(buf)
            member = ZipInfo(i.key, i.last_modified.timetuple())
            zf.writestr(member, buf.getAndReset())

Example:
aws-vault exec -d 24h myprofile -- python3 zip-some-s3-files.py output.zip