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#!/usr/bin/env python

#

# Copyright 2017 Google, Inc.

#

# 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.

"""This application demonstrates how to perform operations on data (content)

when using Google Cloud CDN (Content Delivery Network).

For more information, see the README.md under /cdn and the documentation

at https://cloud.google.com/cdn/docs.

"""

import argparse

import base64

import datetime

import hashlib

import hmac

from six.moves import urllib

# [START sign_url]

def sign_url(url, key_name, base64_key, expiration_time):

"""Gets the Signed URL string for the specified URL and configuration.

Args:

url: URL to sign as a string.

key_name: name of the signing key as a string.

base64_key: signing key as a base64 encoded string.

expiration_time: expiration time as a UTC datetime object.

Returns:

Returns the Signed URL appended with the query parameters based on the

specified configuration.

"""

stripped_url = url.strip()

parsed_url = urllib.parse.urlsplit(stripped_url)

query_params = urllib.parse.parse_qs(

parsed_url.query, keep_blank_values=True)

epoch = datetime.datetime.utcfromtimestamp(0)

expiration_timestamp = int((expiration_time - epoch).total_seconds())

decoded_key = base64.urlsafe_b64decode(base64_key)

url_pattern = u'{url}{separator}Expires={expires}&KeyName={key_name}'

url_to_sign = url_pattern.format(

url=stripped_url,

separator='&' if query_params else '?',

expires=expiration_timestamp,

key_name=key_name)

digest = hmac.new(

decoded_key, url_to_sign.encode('utf-8'), hashlib.sha1).digest()

signature = base64.urlsafe_b64encode(digest).decode('utf-8')

signed_url = u'{url}&Signature={signature}'.format(

url=url_to_sign, signature=signature)

print(signed_url)

# [END sign_url]

if __name__ == '__main__':

parser = argparse.ArgumentParser(

description=__doc__,

formatter_class=argparse.RawDescriptionHelpFormatter)

subparsers = parser.add_subparsers(dest='command')

sign_url_parser = subparsers.add_parser(

'sign-url',

help="Sign a URL to grant temporary authorized access.")

sign_url_parser.add_argument(

'url', help='The URL to sign.')

sign_url_parser.add_argument(

'key_name',

help='Key name for the signing key.')

sign_url_parser.add_argument(

'base64_key',

help='The base64 encoded signing key.')

sign_url_parser.add_argument(

'expiration_time',

type=lambda d: datetime.datetime.utcfromtimestamp(float(d)),

help='Expiration time expessed as seconds since the epoch.')

args = parser.parse_args()

if args.command == 'sign-url':

sign_url(

args.url, args.key_name, args.base64_key, args.expiration_time)