AWS Code Sample

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# Copyright 2010-2019, Inc. or its affiliates. All Rights Reserved. # # This file is licensed under the Apache License, Version 2.0 (the "License"). # You may not use this file except in compliance with the License. A copy of the # License is located at # # # # This file 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. import copy import logging import boto3 from botocore.exceptions import ClientError def get_object_acl(bucket_name, object_name): """Retrieve the access control list of an Amazon S3 object. :param bucket_name: string :param object_name: string :return: Dictionary defining the object's access control policy consisting of owner and grants. If error, return None. """ # Retrieve the bucket ACL s3 = boto3.client('s3') try: response = s3.get_object_acl(Bucket=bucket_name, Key=object_name) except ClientError as e: # AllAccessDisabled error == bucket not found logging.error(e) return None # Return both the Owner and Grants keys # The Owner and Grants settings together form the Access Control Policy. # The Grants alone form the Access Control List. return {'Owner': response['Owner'], 'Grants': response['Grants']} def put_object_acl(bucket_name, object_name, acl): """Set the access control list of an Amazon S3 object. :param bucket_name: string :param object_name: string :param acl: Dictionary defining the ACL consisting of grants and permissions :return: True if ACL was set, otherwise False """ # Set the ACL s3 = boto3.client('s3') try: s3.put_object_acl(Bucket=bucket_name, Key=object_name, AccessControlPolicy=acl) except ClientError as e: # AccessDenied error == bucket/object prohibits public access # AllAccessDisabled error == bucket/object not found # AmbiguousGrantByEmailAddress == email address is associated with # multiple AWS accounts logging.error(e) return False return True def main(): """Exercise put_object_acl()""" # Assign these values before running the program test_bucket_name = 'BUCKET_NAME' test_object_name = 'OBJECT_NAME' new_grantee_canonical_user_id = 'AWS_USER_ID' # new_grantee_email = 'EMAIL_ADDRESS' # Set AWS User ID or email, but not both new_grantee_permission = 'READ' # Or 'FULL_CONTROL', etc. # Set up logging logging.basicConfig(level=logging.DEBUG, format='%(levelname)s: %(asctime)s: %(message)s') # Get the object's current ACL acl = get_object_acl(test_bucket_name, test_object_name) if acl is None: exit(-1) # Add a new grant to the current ACL new_grant = { 'Grantee': { 'ID': new_grantee_canonical_user_id, 'Type': 'CanonicalUser', #'EmailAddress': new_grantee_email, # Set ID or Email #'Type': 'AmazonCustomerByEmail', }, 'Permission': new_grantee_permission, } # If we don't want to modify the original ACL variable, then we # must do a deepcopy modified_acl = copy.deepcopy(acl) modified_acl['Grants'].append(new_grant) # Set the object's ACL if put_object_acl(test_bucket_name, test_object_name, modified_acl):'The ACL was set for {test_object_name}') if __name__ == '__main__': main()

Sample Details

Service: s3

Last tested: 2019-03-07

Author: AWS

Type: full-example

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