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#!/usr/bin/env python

# Licensed under the Apache License, Version 2.0 (the 'License');

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an 'AS IS' BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Command-line sample app demonstrating customer-supplied encryption keys.

This sample demonstrates uploading an object while supplying an encryption key,

retrieving that object's contents, and finally rotating that key to a new

value.

This sample is used on this page:

https://cloud.google.com/storage/docs/json_api/v1/json-api-python-samples

For more information, see the README.md under /storage.

"""

import argparse

import filecmp

import tempfile

from googleapiclient import discovery

from googleapiclient import http

from oauth2client.client import GoogleCredentials

# You can (and should) generate your own encryption key. Here's a good way to

# accomplish this with Python:

# python -c \

# 'import base64; import os; print(base64.encodestring(os.urandom(32)))'

# Although these keys are provided here for simplicity, please remember that it

# is a bad idea to store your encryption keys in your source code.

ENCRYPTION_KEY = '4RzDI0TeWa9M/nAvYH05qbCskPaSU/CFV5HeCxk0IUA='

# You can use openssl to quicly calculate the hash of any key.

# Try running this:

# openssl base64 -d <<< ENCRYPTION_KEY | openssl dgst -sha256 -binary \

# | openssl base64

KEY_HASH = 'aanjNC2nwso8e2FqcWILC3/Tt1YumvIwEj34kr6PRpI='

ANOTHER_ENCRYPTION_KEY = 'oevtavYZC+TfGtV86kJBKTeytXAm1s2r3xIqam+QPKM='

ANOTHER_KEY_HASH = '/gd0N3k3MK0SEDxnUiaswl0FFv6+5PHpo+5KD5SBCeA='

def create_service():

"""Creates the service object for calling the Cloud Storage API."""

# Get the application default credentials. When running locally, these are

# available after running `gcloud init`. When running on compute

# engine, these are available from the environment.

credentials = GoogleCredentials.get_application_default()

# Construct the service object for interacting with the Cloud Storage API -

# the 'storage' service, at version 'v1'.

# You can browse other available api services and versions here:

# https://developers.google.com/api-client-library/python/apis/

return discovery.build('storage', 'v1', credentials=credentials)

def upload_object(bucket, filename, encryption_key, key_hash):

"""Uploads an object, specifying a custom encryption key."""

service = create_service()

with open(filename, 'rb') as f:

request = service.objects().insert(

bucket=bucket, name=filename,

# You can also just set media_body=filename, but for the sake of

# demonstration, pass in the more generic file handle, which could

# very well be a StringIO or similar.

media_body=http.MediaIoBaseUpload(f, 'application/octet-stream'))

request.headers['x-goog-encryption-algorithm'] = 'AES256'

request.headers['x-goog-encryption-key'] = encryption_key

request.headers['x-goog-encryption-key-sha256'] = key_hash

resp = request.execute()

return resp

def download_object(bucket, obj, out_file, encryption_key, key_hash):

"""Downloads an object protected by a custom encryption key."""

service = create_service()

request = service.objects().get_media(bucket=bucket, object=obj)

request.headers['x-goog-encryption-algorithm'] = 'AES256'

request.headers['x-goog-encryption-key'] = encryption_key

request.headers['x-goog-encryption-key-sha256'] = key_hash

# Unfortunately, http.MediaIoBaseDownload overwrites HTTP headers,

# and so it cannot be used here. Instead, we shall download as a

# single request.

out_file.write(request.execute())

def rotate_key(bucket, obj, current_encryption_key, current_key_hash,

new_encryption_key, new_key_hash):

"""Changes the encryption key used to store an existing object."""

service = create_service()

request = service.objects().rewrite(

sourceBucket=bucket, sourceObject=obj,

destinationBucket=bucket, destinationObject=obj,

body={})

# For very large objects, calls to rewrite may not complete on the first

# call and may need to be resumed.

while True:

request.headers.update({

'x-goog-copy-source-encryption-algorithm': 'AES256',

'x-goog-copy-source-encryption-key': current_encryption_key,

'x-goog-copy-source-encryption-key-sha256': current_key_hash,

'x-goog-encryption-algorithm': 'AES256',

'x-goog-encryption-key': new_encryption_key,

'x-goog-encryption-key-sha256': new_key_hash})

rewrite_response = request.execute()

if rewrite_response['done']:

break

print('Continuing rewrite call...')

request = service.objects().rewrite(

source_bucket=bucket, source_object=obj,

destination_bucket=bucket, destination_object=obj,

rewriteToken=rewrite_response['rewriteToken'])

rewrite_response.execute()

def main(bucket, filename):

print('Uploading object gs://{}/{}'.format(bucket, filename))

upload_object(bucket, filename, ENCRYPTION_KEY, KEY_HASH)

print('Downloading it back')

with tempfile.NamedTemporaryFile(mode='w+b') as tmpfile:

download_object(bucket, filename, tmpfile, ENCRYPTION_KEY, KEY_HASH)

tmpfile.seek(0)

assert filecmp.cmp(filename, tmpfile.name), \

'Downloaded file has different content from the original file.'

print('Rotating its key')

rotate_key(bucket, filename, ENCRYPTION_KEY, KEY_HASH,

ANOTHER_ENCRYPTION_KEY, ANOTHER_KEY_HASH)

print('Done')

if __name__ == '__main__':

parser = argparse.ArgumentParser(

description=__doc__,

formatter_class=argparse.RawDescriptionHelpFormatter)

parser.add_argument('bucket', help='Your Cloud Storage bucket.')

parser.add_argument('filename', help='A file to upload and download.')

args = parser.parse_args()

main(args.bucket, args.filename)

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