ACL

Manipulate access control lists that Cloud Storage provides.

google.cloud.storage.bucket.Bucket has a getting method that creates an ACL object under the hood, and you can interact with that using google.cloud.storage.bucket.Bucket.acl():

    client = storage.Client()
    bucket = client.get_bucket(bucket_name)
    acl = bucket.acl

Adding and removing permissions can be done with the following methods (in increasing order of granularity):

ACL.all() corresponds to access for all users.
ACL.all_authenticated() corresponds to access for all users that are signed into a Google account.
ACL.domain() corresponds to access on a per Google Apps domain (ie, example.com).
ACL.group() corresponds to access on a per group basis (either by ID or e-mail address).
ACL.user() corresponds to access on a per user basis (either by ID or e-mail address).

And you are able to grant and revoke the following roles:

Reading: _ACLEntity.grant_read() and _ACLEntity.revoke_read()
Writing: _ACLEntity.grant_write() and _ACLEntity.revoke_write()
Owning: _ACLEntity.grant_owner() and _ACLEntity.revoke_owner()

You can use any of these like any other factory method (these happen to be _ACLEntity factories):

    acl.user("me@example.org").grant_read()
    acl.all_authenticated().grant_write()

After that, you can save any changes you make with the google.cloud.storage.acl.ACL.save() method:

    acl.save()

You can alternatively save any existing google.cloud.storage.acl.ACL object (whether it was created by a factory method or not) from a google.cloud.storage.bucket.Bucket:

    bucket.acl.save(acl=acl)

To get the list of entity and role for each unique pair, the ACL class is iterable:

    print(list(acl))
    # [{'role': 'OWNER', 'entity': 'allUsers'}, ...]

This list of tuples can be used as the entity and role fields when sending metadata for ACLs to the API.

class google.cloud.storage.acl.ACL()

Bases: object

Container class representing a list of access controls.

PREDEFINED_JSON_ACLS( = frozenset({'authenticatedRead', 'bucketOwnerFullControl', 'bucketOwnerRead', 'private', 'projectPrivate', 'publicRead', 'publicReadWrite'} )

See https://cloud.google.com/storage/docs/access-control/lists#predefined-acl

add_entity(entity)

Add an entity to the ACL.

Parameters

entity (_ACLEntity) – The entity to add to this ACL.

all()

Factory method for an Entity representing all users.

Return type

_ACLEntity
Returns

An entity representing all users.

all_authenticated()

Factory method for an Entity representing all authenticated users.

Return type

_ACLEntity
Returns

An entity representing all authenticated users.

clear(client=None)

Remove all ACL entries.

If user_project is set, bills the API request to that project.

Note that this won’t actually remove ALL the rules, but it will remove all the non-default rules. In short, you’ll still have access to a bucket that you created even after you clear ACL rules with this method.

Parameters

client (Client or NoneType) – Optional. The client to use. If not passed, falls back to the client stored on the ACL’s parent.

property client()

Abstract getter for the object client.

domain(domain)

Factory method for a domain Entity.

Parameters

domain (str) – The domain for this entity.
Return type

_ACLEntity
Returns

An entity corresponding to this domain.

entity(entity_type, identifier=None)

Factory method for creating an Entity.

If an entity with the same type and identifier already exists, this will return a reference to that entity. If not, it will create a new one and add it to the list of known entities for this ACL.

Parameters
- entity_type (str) – The type of entity to create (ie, user, group, etc)
- identifier (str) – The ID of the entity (if applicable). This can be either an ID or an e-mail address.
Return type

_ACLEntity
Returns

A new Entity or a reference to an existing identical entity.

entity_from_dict(entity_dict)

Build an _ACLEntity object from a dictionary of data.

An entity is a mutable object that represents a list of roles belonging to either a user or group or the special types for all users and all authenticated users.

Parameters

entity_dict (dict) – Dictionary full of data from an ACL lookup.
Return type

_ACLEntity
Returns

An Entity constructed from the dictionary.

get_entities()

Get a list of all Entity objects.

Return type

list of _ACLEntity objects
Returns

A list of all Entity objects.

get_entity(entity, default=None)

Gets an entity object from the ACL.

Parameters
- entity (_ACLEntity or string) – The entity to get lookup in the ACL.
- default (anything) – This value will be returned if the entity doesn’t exist.
Return type

_ACLEntity
Returns

The corresponding entity or the value provided to default.

group(identifier)

Factory method for a group Entity.

Parameters

identifier (str) – An id or e-mail for this particular group.
Return type

_ACLEntity
Returns

An Entity corresponding to this group.

has_entity(entity)

Returns whether or not this ACL has any entries for an entity.

Parameters

entity (_ACLEntity) – The entity to check for existence in this ACL.
Return type

bool
Returns

True of the entity exists in the ACL.

reload(client=None)

Reload the ACL data from Cloud Storage.

If user_project is set, bills the API request to that project.

Parameters

client (Client or NoneType) – Optional. The client to use. If not passed, falls back to the client stored on the ACL’s parent.

reset()

Remove all entities from the ACL, and clear the loaded flag.

save(acl=None, client=None)

Save this ACL for the current bucket.

If user_project is set, bills the API request to that project.

Parameters
- acl (google.cloud.storage.acl.ACL, or a compatible list.) – The ACL object to save. If left blank, this will save current entries.
- client (Client or NoneType) – Optional. The client to use. If not passed, falls back to the client stored on the ACL’s parent.

save_predefined(predefined, client=None)

Save this ACL for the current bucket using a predefined ACL.

If user_project is set, bills the API request to that project.

Parameters
- predefined (str) – An identifier for a predefined ACL. Must be one of the keys in PREDEFINED_JSON_ACLS or PREDEFINED_XML_ACLS (which will be aliased to the corresponding JSON name). If passed, acl must be None.
- client (Client or NoneType) – Optional. The client to use. If not passed, falls back to the client stored on the ACL’s parent.

user(identifier)

Factory method for a user Entity.

Parameters

identifier (str) – An id or e-mail for this particular user.
Return type

_ACLEntity
Returns

An Entity corresponding to this user.

classmethod validate_predefined(predefined)

Ensures predefined is in list of predefined json values

Parameters
- predefined (str) – name of a predefined acl
- predefined – validated JSON name of predefined acl
Raises
- exc
  
  ValueError: If predefined is not a valid acl

class google.cloud.storage.acl.BucketACL(bucket)

Bases: google.cloud.storage.acl.ACL

An ACL specifically for a bucket.

Parameters

bucket (google.cloud.storage.bucket.Bucket) – The bucket to which this ACL relates.

property client()

The client bound to this ACL’s bucket.

property reload_path()

Compute the path for GET API requests for this ACL.

property save_path()

Compute the path for PATCH API requests for this ACL.

property user_project()

Compute the user project charged for API requests for this ACL.

class google.cloud.storage.acl.DefaultObjectACL(bucket)

Bases: google.cloud.storage.acl.BucketACL

A class representing the default object ACL for a bucket.

class google.cloud.storage.acl.ObjectACL(blob)

Bases: google.cloud.storage.acl.ACL

An ACL specifically for a Cloud Storage object / blob.

Parameters

blob (google.cloud.storage.blob.Blob) – The blob that this ACL corresponds to.

property client()

The client bound to this ACL’s blob.

property reload_path()

Compute the path for GET API requests for this ACL.

property save_path()

Compute the path for PATCH API requests for this ACL.

property user_project()

Compute the user project charged for API requests for this ACL.