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# !/usr/bin/env python

#

# Copyright 2018 Google LLC

#

# 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.

"""Demonstrates how to perform basic access management with Google Cloud IAM.

For more information, see the documentation at

https://cloud.google.com/iam/docs/granting-changing-revoking-access.

"""

import argparse

import os

from google.oauth2 import service_account

import googleapiclient.discovery

credentials = service_account.Credentials.from_service_account_file(

filename=os.environ['GOOGLE_APPLICATION_CREDENTIALS'],

scopes=['https://www.googleapis.com/auth/cloud-platform'])

service = googleapiclient.discovery.build(

'cloudresourcemanager', 'v1', credentials=credentials)

# [START iam_get_policy]

def get_policy(project_id):

"""Gets IAM policy for a project."""

# pylint: disable=no-member

policy = service.projects().getIamPolicy(

resource=project_id, body={}).execute()

print(policy)

return policy

# [END iam_get_policy]

# [START iam_modify_policy_add_member]

def modify_policy_add_member(policy, role, member):

"""Adds a new member to a role binding."""

binding = next(b for b in policy['bindings'] if b['role'] == role)

binding['members'].append(member)

print(binding)

return policy

# [END iam_modify_policy_add_member]

# [START iam_modify_policy_add_role]

def modify_policy_add_role(policy, role, member):

"""Adds a new role binding to a policy."""

binding = {

'role': role,

'members': [member]

}

policy['bindings'].append(binding)

print(policy)

return policy

# [END iam_modify_policy_add_role]

# [START iam_set_policy]

def set_policy(project_id, policy):

"""Sets IAM policy for a project."""

# pylint: disable=no-member

policy = service.projects().setIamPolicy(

resource=project_id, body={

'policy': policy

}).execute()

print(policy)

return policy

# [END iam_set_policy]

def main():

parser = argparse.ArgumentParser(

description=__doc__,

formatter_class=argparse.RawDescriptionHelpFormatter)

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

# Get

get_parser = subparsers.add_parser(

'get', help=get_policy.__doc__)

get_parser.add_argument('project_id')

# Modify: add member

modify_member_parser = subparsers.add_parser(

'modify_member', help=get_policy.__doc__)

modify_member_parser.add_argument('project_id')

modify_member_parser.add_argument('role')

modify_member_parser.add_argument('member')

# Modify: add role

modify_role_parser = subparsers.add_parser(

'modify_role', help=get_policy.__doc__)

modify_role_parser.add_argument('project_id')

modify_role_parser.add_argument('project_id')

modify_role_parser.add_argument('role')

modify_role_parser.add_argument('member')

# Set

set_parser = subparsers.add_parser(

'set', help=set_policy.__doc__)

set_parser.add_argument('project_id')

set_parser.add_argument('policy')

args = parser.parse_args()

if args.command == 'get':

get_policy(args.project_id)

elif args.command == 'set':

set_policy(args.project_id, args.policy)

elif args.command == 'add_member':

modify_policy_add_member(args.policy, args.role, args.member)

elif args.command == 'add_binding':

modify_policy_add_role(args.policy, args.role, args.member)

if __name__ == '__main__':

main()