Utilizando la API de Python, he creado una exportación. ¿Cómo descargo el archivo .zip en la exportación usando el mismo servicio autorizado? Al crear la exportación, puedo ver bucketName y objectNames de cloudStorageSink, sin embargo, no puedo encontrar ninguna documentación sobre cómo descargarlos a mi host utilizando el servicio existente que creó la exportación

#!/usr/bin/env python
from __future__ import print_function

import datetime
import json
import time

from googleapiclient.discovery import build
from httplib2 import Http
from oauth2client import file, client, tools

# If modifying these scopes, delete the file token.json.
SCOPES = 'https://www.googleapis.com/auth/ediscovery'

def list_exports(service, matter_id):
    return service.matters().exports().list(matterId=matter_id).execute()


def get_export_by_id(service, matter_id, export_id):
    return service.matters().exports().get(matterId=matter_id, exportId=export_id).execute()

def get_service():
    '''
    Look for an active credential token, if one does not exist, use credentials.json
    and ask user for permission to access.  Store new token, return the service object
    '''
    store = file.Storage('token.json')
    creds = store.get()
    if not creds or creds.invalid:
        flow = client.flow_from_clientsecrets('credentials.json', SCOPES)
        creds = tools.run_flow(flow, store)
    service = build('vault', 'v1', http=creds.authorize(Http()))

    return service


def create_drive_export(service, matter_id, export_name, num_days):
    """
    once we have a matter_id , we can create an export under it with the relevant files we are looking for.

    """
    # set times for beginning and end of query:
    today = datetime.datetime.now()
    print("creating a drive export at {}".format(today))
    start_time = today - datetime.timedelta(days=num_days)

    drive_query_options = {'includeTeamDrives': True}
    user_list = ['[email protected]']
    drive_query = {
        'corpus': 'DRIVE',
        'dataScope': 'ALL_DATA',
        'searchMethod': 'ACCOUNT',
        'accountInfo': {
            'emails': user_list
        },
        'driveOptions': drive_query_options,
        # end time is more recent date, start time is older date
        'endTime': '{}-{}-{}T00:00:00Z'.format(today.year, today.month, today.day),
        'startTime': '{}-{}-{}T00:00:00Z'.format(start_time.year, start_time.month, start_time.day),
        'timeZone': 'Etc/GMT'
    }

    wanted_export = {
        'name': export_name,
        'query': drive_query,
        'exportOptions': {
            'driveOptions': {}
        }
    }

    return service.matters().exports().create(matterId=matter_id, body=wanted_export).execute()


def get_export(service, matter_id, export_id):
    return service.matters().exports().get(matterId=matter_id, exportId=export_id).execute()


def main():
    service = get_service()
    matter_id = '<known_matter_id>'
    timestamp = datetime.datetime.now().strftime("%Y%m%d.%H%M%s")
    export = create_drive_export(service, matter_id, "code_gen_export.{}".format(timestamp), 1)

    # check every 5 seconds until export is done being created:
    while export['status'] == 'IN_PROGRESS':
        export = get_export(service, matter_id, export['id'])
        print('...')
        time.sleep(5)

    # print(json.dumps(export, indent=2))
    print(json.dumps(export['cloudStorageSink']['files'], indent=2))


if __name__ == '__main__':
    main()

y ejecutar el código anterior produce:

creating a drive export at 2018-09-20 17:12:38.026402
...
...
...
...
...
...
[
  {
    "md5Hash": "hash_value",
    "bucketName": "bucket_string",
    "objectName": "object1_string/code_gen_export.20180920.17121537481558-custodian-docid.csv",
    "size": "1684"
  },
  {
    "md5Hash": "hash_value",
    "bucketName": "bucket_string",
    "objectName": "object2_string/code_gen_export.20180920.17121537481558-metadata.xml",
    "size": "10600"
  },
  {
    "md5Hash": "hash_value",
    "bucketName": "bucket_string",
    "objectName": "object3_string/code_gen_export.20180920.17121537481558_0.zip",
    "size": "21599222"
  }
]

¿Puedo descargar el archivo .zip usando el objeto de servicio que creé en get_service ()?