Class Bucket (2.1.0)

Version 2.1.0

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Bucket(client, name=None, user_project=None)

A class representing a Bucket on Cloud Storage.

Parameters
Name	Description
client	Client A client which holds credentials and project configuration for the bucket (which requires a project).
name	str The name of the bucket. Bucket names must start and end with a number or letter.
user_project	str (Optional) the project ID to be billed for API requests made via this instance.

Properties

acl

Create our ACL on demand.

client

The client bound to this bucket.

cors

Retrieve or set CORS policies configured for this bucket.

See http://www.w3.org/TR/cors/ and https://cloud.google.com/storage/docs/json_api/v1/buckets

Note: The getter for this property returns a list which contains copies of the bucket's CORS policy mappings. Mutating the list or one of its dicts has no effect unless you then re-assign the dict via the setter. E.g.: >>> policies = bucket.cors >>> policies.append({'origin': '/foo', ...}) >>> policies[1]['maxAgeSeconds'] = 3600 >>> del policies[0] >>> bucket.cors = policies >>> bucket.update()

Returns
Type	Description
list of dictionaries	A sequence of mappings describing each CORS policy.

default_event_based_hold

Scalar property getter.

default_kms_key_name

Retrieve / set default KMS encryption key for objects in the bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets

:setter: Set default KMS encryption key for items in this bucket. :getter: Get default KMS encryption key for items in this bucket.

Returns
Type	Description
str	Default KMS encryption key, or None if not set.

default_object_acl

Create our defaultObjectACL on demand.

etag

Retrieve the ETag for the bucket.

See https://tools.ietf.org/html/rfc2616#section-3.11 and https://cloud.google.com/storage/docs/json_api/v1/buckets

Returns
Type	Description
str or NoneType	The bucket etag or None if the bucket's resource has not been loaded from the server.

iam_configuration

Retrieve IAM configuration for this bucket.

Returns
Type	Description
IAMConfiguration	an instance for managing the bucket's IAM configuration.

id

Retrieve the ID for the bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets

Returns
Type	Description
str or NoneType	The ID of the bucket or None if the bucket's resource has not been loaded from the server.

labels

Retrieve or set labels assigned to this bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets#labels

Note: The getter for this property returns a dict which is a copy of the bucket's labels. Mutating that dict has no effect unless you then re-assign the dict via the setter. E.g.: >>> labels = bucket.labels >>> labels['new_key'] = 'some-label' >>> del labels['old_key'] >>> bucket.labels = labels >>> bucket.update()

Returns
Type	Description
dict	Name-value pairs (string->string) labelling the bucket.

lifecycle_rules

Retrieve or set lifecycle rules configured for this bucket.

See https://cloud.google.com/storage/docs/lifecycle and https://cloud.google.com/storage/docs/json_api/v1/buckets

Note: The getter for this property returns a list which contains copies of the bucket's lifecycle rules mappings. Mutating the list or one of its dicts has no effect unless you then re-assign the dict via the setter. E.g.: >>> rules = bucket.lifecycle_rules >>> rules.append({'origin': '/foo', ...}) >>> rules[1]['rule']['action']['type'] = 'Delete' >>> del rules[0] >>> bucket.lifecycle_rules = rules >>> bucket.update()

Returns
Type	Description
generator(dict)	A sequence of mappings describing each lifecycle rule.

location

Retrieve location configured for this bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets and https://cloud.google.com/storage/docs/bucket-locations

Returns None if the property has not been set before creation, or if the bucket's resource has not been loaded from the server.

location_type

Retrieve or set the location type for the bucket.

See https://cloud.google.com/storage/docs/storage-classes

:setter: Set the location type for this bucket. :getter: Gets the the location type for this bucket.

Returns
Type	Description
str or NoneType	If set, one of MULTI_REGION_LOCATION_TYPE, REGION_LOCATION_TYPE, or DUAL_REGION_LOCATION_TYPE, else None.

metageneration

Retrieve the metageneration for the bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets

Returns
Type	Description
int or NoneType	The metageneration of the bucket or None if the bucket's resource has not been loaded from the server.

owner

Retrieve info about the owner of the bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets

Returns
Type	Description
dict or NoneType	Mapping of owner's role/ID. Returns None if the bucket's resource has not been loaded from the server.

path

The URL path to this bucket.

project_number

Retrieve the number of the project to which the bucket is assigned.

See https://cloud.google.com/storage/docs/json_api/v1/buckets

Returns
Type	Description
int or NoneType	The project number that owns the bucket or None if the bucket's resource has not been loaded from the server.

requester_pays

Does the requester pay for API requests for this bucket?

See https://cloud.google.com/storage/docs/requester-pays for details.

:setter: Update whether requester pays for this bucket. :getter: Query whether requester pays for this bucket.

Returns
Type	Description
bool	True if requester pays for API requests for the bucket, else False.

retention_period

Retrieve or set the retention period for items in the bucket.

Returns
Type	Description
int or NoneType	number of seconds to retain items after upload or release from event-based lock, or None if the property is not set locally.

retention_policy_effective_time

Retrieve the effective time of the bucket's retention policy.

Returns
Type	Description
datetime.datetime or NoneType	point-in time at which the bucket's retention policy is effective, or None if the property is not set locally.

retention_policy_locked

Retrieve whthere the bucket's retention policy is locked.

Returns
Type	Description
bool	True if the bucket's policy is locked, or else False if the policy is not locked, or the property is not set locally.

rpo

Get the RPO (Recovery Point Objective) of this bucket

See: https://cloud.google.com/storage/docs/managing-turbo-replication

"ASYNC_TURBO" or "DEFAULT"

self_link

Retrieve the URI for the bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets

Returns
Type	Description
str or NoneType	The self link for the bucket or None if the bucket's resource has not been loaded from the server.

storage_class

Retrieve or set the storage class for the bucket.

See https://cloud.google.com/storage/docs/storage-classes

:setter: Set the storage class for this bucket. :getter: Gets the the storage class for this bucket.

Returns
Type	Description
str or NoneType	If set, one of NEARLINE_STORAGE_CLASS, COLDLINE_STORAGE_CLASS, ARCHIVE_STORAGE_CLASS, STANDARD_STORAGE_CLASS, MULTI_REGIONAL_LEGACY_STORAGE_CLASS, REGIONAL_LEGACY_STORAGE_CLASS, or DURABLE_REDUCED_AVAILABILITY_LEGACY_STORAGE_CLASS, else None.

time_created

Retrieve the timestamp at which the bucket was created.

See https://cloud.google.com/storage/docs/json_api/v1/buckets

Returns
Type	Description
datetime.datetime or NoneType	Datetime object parsed from RFC3339 valid timestamp, or None if the bucket's resource has not been loaded from the server.

user_project

Project ID to be billed for API requests made via this bucket.

If unset, API requests are billed to the bucket owner.

A user project is required for all operations on Requester Pays buckets.

See https://cloud.google.com/storage/docs/requester-pays#requirements for details.

versioning_enabled

Is versioning enabled for this bucket?

See https://cloud.google.com/storage/docs/object-versioning for details.

:setter: Update whether versioning is enabled for this bucket. :getter: Query whether versioning is enabled for this bucket.

Returns
Type	Description
bool	True if enabled, else False.

Methods

Bucket

Bucket(client, name=None, user_project=None)

property name Get the bucket's name.

add_lifecycle_delete_rule

add_lifecycle_delete_rule(**kw)

Add a "delete" rule to lifestyle rules configured for this bucket.

See https://cloud.google.com/storage/docs/lifecycle and https://cloud.google.com/storage/docs/json_api/v1/buckets

.. literalinclude:: snippets.py :start-after: [START add_lifecycle_delete_rule] :end-before: [END add_lifecycle_delete_rule] :dedent: 4

add_lifecycle_set_storage_class_rule

add_lifecycle_set_storage_class_rule(storage_class, **kw)

Add a "delete" rule to lifestyle rules configured for this bucket.

See https://cloud.google.com/storage/docs/lifecycle and https://cloud.google.com/storage/docs/json_api/v1/buckets

.. literalinclude:: snippets.py :start-after: [START add_lifecycle_set_storage_class_rule] :end-before: [END add_lifecycle_set_storage_class_rule] :dedent: 4

Parameter
Name	Description
storage_class	str, one of STORAGE_CLASSES. new storage class to assign to matching items.

blob

blob(
    blob_name, chunk_size=None, encryption_key=None, kms_key_name=None, generation=None
)

Factory constructor for blob object.

Note: This will not make an HTTP request; it simply instantiates a blob object owned by this bucket.

Parameters
Name	Description
blob_name	str The name of the blob to be instantiated.
chunk_size	int The size of a chunk of data whenever iterating (in bytes). This must be a multiple of 256 KB per the API specification.
encryption_key	bytes (Optional) 32 byte encryption key for customer-supplied encryption.
kms_key_name	str (Optional) Resource name of KMS key used to encrypt blob's content.
generation	long (Optional) If present, selects a specific revision of this object.

Returns
Type	Description
Blob	The blob object created.

clear_lifecyle_rules

clear_lifecyle_rules()

Set lifestyle rules configured for this bucket.

See https://cloud.google.com/storage/docs/lifecycle and https://cloud.google.com/storage/docs/json_api/v1/buckets

configure_website

configure_website(main_page_suffix=None, not_found_page=None)

Configure website-related properties.

See https://cloud.google.com/storage/docs/hosting-static-website

Note: This (apparently) only works if your bucket name is a domain name (and to do that, you need to get approved somehow...).

If you want this bucket to host a website, just provide the name of an index page and a page to use when a blob isn't found:

.. literalinclude:: snippets.py :start-after: [START configure_website] :end-before: [END configure_website] :dedent: 4

You probably should also make the whole bucket public:

.. literalinclude:: snippets.py :start-after: [START make_public] :end-before: [END make_public] :dedent: 4

This says: "Make the bucket public, and all the stuff already in the bucket, and anything else I add to the bucket. Just make it all public."

Parameters
Name	Description
main_page_suffix	str The page to use as the main page of a directory. Typically something like index.html.
not_found_page	str The file to use when a page isn't found.

copy_blob

copy_blob(blob, destination_bucket, new_name=None, client=None, preserve_acl=True, source_generation=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, if_source_generation_match=None, if_source_generation_not_match=None, if_source_metageneration_match=None, if_source_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Copy the given blob to the given bucket, optionally with a new name.

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

Parameters
Name	Description
blob	Blob The blob to be copied.
destination_bucket	Bucket The bucket into which the blob should be copied.
new_name	str (Optional) The new name for the copied file.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
preserve_acl	bool DEPRECATED. This argument is not functional! (Optional) Copies ACL from old blob to new blob. Default: True.
source_generation	long (Optional) The generation of the blob to be copied.
if_generation_match	long (Optional) See :ref:using-if-generation-match Note that the generation to be matched is that of the destination blob.
if_generation_not_match	long (Optional) See :ref:using-if-generation-not-match Note that the generation to be matched is that of the destination blob.
if_metageneration_match	long (Optional) See :ref:using-if-metageneration-match Note that the metageneration to be matched is that of the destination blob.
if_metageneration_not_match	long (Optional) See :ref:using-if-metageneration-not-match Note that the metageneration to be matched is that of the destination blob.
if_source_generation_match	long (Optional) Makes the operation conditional on whether the source object's generation matches the given value.
if_source_generation_not_match	long (Optional) Makes the operation conditional on whether the source object's generation does not match the given value.
if_source_metageneration_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration matches the given value.
if_source_metageneration_not_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration does not match the given value.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
Blob	The new Blob. .. rubric:: Example Copy a blob including ACL. >>> from google.cloud import storage >>> client = storage.Client(project="project") >>> bucket = client.bucket("bucket") >>> dst_bucket = client.bucket("destination-bucket") >>> blob = bucket.blob("file.ext") >>> new_blob = bucket.copy_blob(blob, dst_bucket) >>> new_blob.acl.save(blob.acl)

create

create(client=None, project=None, location=None, predefined_acl=None, predefined_default_object_acl=None, timeout=60, retry=<google.api_core.retry.Retry object>)

DEPRECATED. Creates current bucket.

Note: Direct use of this method is deprecated. Use Client.create_bucket() instead.

If the bucket already exists, will raise xref_Conflict.

This implements "storage.buckets.insert".

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

Parameters
Name	Description
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
project	str (Optional) The project under which the bucket is to be created. If not passed, uses the project set on the client.
location	str (Optional) The location of the bucket. If not passed, the default location, US, will be used. See https://cloud.google.com/storage/docs/bucket-locations
predefined_acl	str (Optional) Name of predefined ACL to apply to bucket. See: https://cloud.google.com/storage/docs/access-control/lists#predefined-acl
predefined_default_object_acl	str (Optional) Name of predefined ACL to apply to bucket's objects. See: https://cloud.google.com/storage/docs/access-control/lists#predefined-acl
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
ValueError	if project is None and client's project is also None.

delete

delete(force=False, client=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, retry=<google.api_core.retry.Retry object>)

Delete this bucket.

The bucket must be empty in order to submit a delete request. If force=True is passed, this will first attempt to delete all the objects / blobs in the bucket (i.e. try to empty the bucket).

If the bucket doesn't exist, this will raise xref_NotFound. If the bucket is not empty (and force=False), will raise xref_Conflict.

If force=True and the bucket contains more than 256 objects / blobs this will cowardly refuse to delete the objects (or the bucket). This is to prevent accidental bucket deletion and to prevent extremely long runtime of this method.

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

Parameters
Name	Description
force	bool If True, empties the bucket's objects then deletes it.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
if_metageneration_match	long (Optional) Make the operation conditional on whether the blob's current metageneration matches the given value.
if_metageneration_not_match	long (Optional) Make the operation conditional on whether the blob's current metageneration does not match the given value.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
`ValueError	if force is True and the bucket contains more than 256 objects / blobs.

delete_blob

delete_blob(blob_name, client=None, generation=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Deletes a blob from the current bucket.

If the blob isn't found (backend 404), raises a xref_NotFound.

For example:

.. literalinclude:: snippets.py :start-after: [START delete_blob] :end-before: [END delete_blob] :dedent: 4

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

Parameters
Name	Description
blob_name	str A blob name to delete.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
generation	long (Optional) If present, permanently deletes a specific revision of this object.
if_generation_match	long (Optional) See :ref:using-if-generation-match
if_generation_not_match	long (Optional) See :ref:using-if-generation-not-match
if_metageneration_match	long (Optional) See :ref:using-if-metageneration-match
if_metageneration_not_match	long (Optional) See :ref:using-if-metageneration-not-match
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
NotFound	(to suppress the exception, call delete_blobs, passing a no-op on_error callback, e.g.: .. literalinclude:: snippets.py :start-after: [START delete_blobs] :end-before: [END delete_blobs] :dedent: 4

delete_blobs

delete_blobs(blobs, on_error=None, client=None, timeout=60, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Deletes a list of blobs from the current bucket.

Uses delete_blob to delete each individual blob.

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

Parameters
Name	Description
blobs	list A list of Blob-s or blob names to delete.
on_error	callable (Optional) Takes single argument: blob. Called called once for each blob raising NotFound; otherwise, the exception is propagated.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
if_generation_match	list of long (Optional) See :ref:using-if-generation-match Note that the length of the list must match the length of The list must match blobs item-to-item.
if_generation_not_match	list of long (Optional) See :ref:using-if-generation-not-match The list must match blobs item-to-item.
if_metageneration_match	list of long (Optional) See :ref:using-if-metageneration-match The list must match blobs item-to-item.
if_metageneration_not_match	list of long (Optional) See :ref:using-if-metageneration-not-match The list must match blobs item-to-item.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
NotFound	(if on_error is not passed). .. rubric:: Example Delete blobs using generation match preconditions. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = client.bucket("bucket-name") >>> blobs = [bucket.blob("blob-name-1"), bucket.blob("blob-name-2")] >>> if_generation_match = [None] * len(blobs) >>> if_generation_match[0] = "123" # precondition for "blob-name-1" >>> bucket.delete_blobs(blobs, if_generation_match=if_generation_match)

disable_logging

disable_logging()

Disable access logging for this bucket.

See https://cloud.google.com/storage/docs/access-logs#disabling

disable_website

disable_website()

Disable the website configuration for this bucket.

This is really just a shortcut for setting the website-related attributes to None.

enable_logging

enable_logging(bucket_name, object_prefix="")

Enable access logging for this bucket.

See https://cloud.google.com/storage/docs/access-logs

Parameters
Name	Description
bucket_name	str name of bucket in which to store access logs
object_prefix	str prefix for access log filenames

exists

exists(client=None, timeout=60, if_etag_match=None, if_etag_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.api_core.retry.Retry object>)

Determines whether or not this bucket exists.

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

Parameters
Name	Description
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
if_etag_match	Union[str, Set[str]] (Optional) Make the operation conditional on whether the bucket's current ETag matches the given value.
if_etag_not_match	Union[str, Set[str]]) (Optional) Make the operation conditional on whether the bucket's current ETag does not match the given value.
if_metageneration_match	long (Optional) Make the operation conditional on whether the bucket's current metageneration matches the given value.
if_metageneration_not_match	long (Optional) Make the operation conditional on whether the bucket's current metageneration does not match the given value.
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
bool	True if the bucket exists in Cloud Storage.

from_string

from_string(uri, client=None)

Get a constructor for bucket object by URI.

Parameters
Name	Description
uri	str The bucket uri pass to get bucket object.
client	Client or NoneType (Optional) The client to use. Application code should always pass client.

Returns
Type	Description
Bucket	The bucket object created. .. rubric:: Example Get a constructor for bucket object by URI.. >>> from google.cloud import storage >>> from google.cloud.storage.bucket import Bucket >>> client = storage.Client() >>> bucket = Bucket.from_string("gs://bucket", client=client)

generate_signed_url

generate_signed_url(
    expiration=None,
    api_access_endpoint="https://storage.googleapis.com",
    method="GET",
    headers=None,
    query_parameters=None,
    client=None,
    credentials=None,
    version=None,
    virtual_hosted_style=False,
    bucket_bound_hostname=None,
    scheme="http",
)

Generates a signed URL for this bucket.

Note: If you are on Google Compute Engine, you can't generate a signed URL using GCE service account. Follow Issue 50_ for updates on this. If you'd like to be able to generate a signed URL from GCE, you can use a standard service account from a JSON file rather than a GCE service account.

If you have a bucket that you want to allow access to for a set amount of time, you can use this method to generate a URL that is only valid within a certain time period.

If bucket_bound_hostname is set as an argument of api_access_endpoint, https works only if using a CDN.

.. rubric:: Example

Generates a signed URL for this bucket using bucket_bound_hostname and scheme.

from google.cloud import storage client = storage.Client() bucket = client.get_bucket('my-bucket-name') url = bucket.generate_signed_url(expiration='url-expiration-time', bucket_bound_hostname='mydomain.tld', version='v4') url = bucket.generate_signed_url(expiration='url-expiration-time', bucket_bound_hostname='mydomain.tld', version='v4',scheme='https') # If using CDN

This is particularly useful if you don't want publicly accessible buckets, but don't want to require users to explicitly log in.

Parameters
Name	Description
expiration	Union[Integer, datetime.datetime, datetime.timedelta] Point in time when the signed URL should expire. If a datetime instance is passed without an explicit tzinfo set, it will be assumed to be UTC.
api_access_endpoint	str (Optional) URI base.
method	str The HTTP verb that will be used when requesting the URL.
headers	dict (Optional) Additional HTTP headers to be included as part of the signed URLs. See: https://cloud.google.com/storage/docs/xml-api/reference-headers Requests using the signed URL must pass the specified header (name and value) with each request for the URL.
query_parameters	dict (Optional) Additional query parameters to be included as part of the signed URLs. See: https://cloud.google.com/storage/docs/xml-api/reference-headers#query
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
credentials	google.auth.credentials.Credentials or NoneType The authorization credentials to attach to requests. These credentials identify this application to the service. If none are specified, the client will attempt to ascertain the credentials from the environment.
version	str (Optional) The version of signed credential to create. Must be one of 'v2' 'v4'.
virtual_hosted_style	bool (Optional) If true, then construct the URL relative the bucket's virtual hostname, e.g., '
bucket_bound_hostname	str (Optional) If pass, then construct the URL relative to the bucket-bound hostname. Value cane be a bare or with scheme, e.g., 'example.com' or 'http://example.com'. See: https://cloud.google.com/storage/docs/request-endpoints#cname
scheme	str (Optional) If bucket_bound_hostname is passed as a bare hostname, use this value as the scheme. https will work only when using a CDN. Defaults to "http".

Exceptions
Type	Description
`ValueError	when version is invalid.
`TypeError	when expiration is not a valid type.
`AttributeError	if credentials is not an instance of google.auth.credentials.Signing.

Returns
Type	Description
str	A signed URL you can use to access the resource until expiration.

generate_upload_policy

generate_upload_policy(conditions, expiration=None, client=None)

Create a signed upload policy for uploading objects.

This method generates and signs a policy document. You can use policy documents_ to allow visitors to a website to upload files to Google Cloud Storage without giving them direct write access.

For example:

.. literalinclude:: snippets.py :start-after: [START policy_document] :end-before: [END policy_document] :dedent: 4

.. _policy documents: https://cloud.google.com/storage/docs/xml-api /post-object#policydocument

Parameters
Name	Description
expiration	datetime (Optional) Expiration in UTC. If not specified, the policy will expire in 1 hour.
conditions	list A list of conditions as described in the policy documents_ documentation.
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.

Returns
Type	Description
dict	A dictionary of (form field name, form field value) of form fields that should be added to your HTML upload form in order to attach the signature.

get_blob

get_blob(blob_name, client=None, encryption_key=None, generation=None, if_etag_match=None, if_etag_not_match=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, timeout=60, retry=<google.api_core.retry.Retry object>, **kwargs)

Get a blob object by name.

This will return None if the blob doesn't exist:

.. literalinclude:: snippets.py :start-after: [START get_blob] :end-before: [END get_blob] :dedent: 4

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

Parameters
Name	Description
blob_name	str The name of the blob to retrieve.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
encryption_key	bytes (Optional) 32 byte encryption key for customer-supplied encryption. See https://cloud.google.com/storage/docs/encryption#customer-supplied.
generation	long (Optional) If present, selects a specific revision of this object.
if_etag_match	Union[str, Set[str]] (Optional) See :ref:using-if-etag-match
if_etag_not_match	Union[str, Set[str]] (Optional) See :ref:using-if-etag-not-match
if_generation_match	long (Optional) See :ref:using-if-generation-match
if_generation_not_match	long (Optional) See :ref:using-if-generation-not-match
if_metageneration_match	long (Optional) See :ref:using-if-metageneration-match
if_metageneration_not_match	long (Optional) See :ref:using-if-metageneration-not-match
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
Blob or None	The blob object if it exists, otherwise None.

get_iam_policy

get_iam_policy(client=None, requested_policy_version=None, timeout=60, retry=<google.api_core.retry.Retry object>)

Retrieve the IAM policy for the bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets/getIamPolicy

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

Parameters
Name	Description
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
requested_policy_version	int or NoneType (Optional) The version of IAM policies to request. If a policy with a condition is requested without setting this, the server will return an error. This must be set to a value of 3 to retrieve IAM policies containing conditions. This is to prevent client code that isn't aware of IAM conditions from interpreting and modifying policies incorrectly. The service might return a policy with version lower than the one that was requested, based on the feature syntax in the policy fetched.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
google.api_core.iam.Policy	the policy instance, based on the resource returned from the getIamPolicy API request. Example: .. code-block:: python from google.cloud.storage.iam import STORAGE_OBJECT_VIEWER_ROLE policy = bucket.get_iam_policy(requested_policy_version=3) policy.version = 3 # Add a binding to the policy via it's bindings property policy.bindings.append({ "role": STORAGE_OBJECT_VIEWER_ROLE, "members": {"serviceAccount:[e-mail]", ...}, # Optional: "condition": { "title": "prefix" "description": "Objects matching prefix" "expression": "resource.name.startsWith("projects/project-name/buckets/bucket-name/objects/prefix")" } }) bucket.set_iam_policy(policy)

get_logging

get_logging()

Return info about access logging for this bucket.

See https://cloud.google.com/storage/docs/access-logs#status

Returns
Type	Description
dict or None	a dict w/ keys, logBucket and logObjectPrefix (if logging is enabled), or None (if not).

get_notification

get_notification(notification_id, client=None, timeout=60, retry=<google.api_core.retry.Retry object>)

Get Pub / Sub notification for this bucket.

See: https://cloud.google.com/storage/docs/json_api/v1/notifications/get

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

Parameters
Name	Description
notification_id	str The notification id to retrieve the notification configuration.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
.BucketNotification	notification instance. .. rubric:: Example Get notification using notification id. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = client.get_bucket('my-bucket-name') # API request. >>> notification = bucket.get_notification(notification_id='id') # API request.

list_blobs

list_blobs(max_results=None, page_token=None, prefix=None, delimiter=None, start_offset=None, end_offset=None, include_trailing_delimiter=None, versions=None, projection='noAcl', fields=None, client=None, timeout=60, retry=<google.api_core.retry.Retry object>)

DEPRECATED. Return an iterator used to find blobs in the bucket.

Note: Direct use of this method is deprecated. Use Client.list_blobs instead.

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

Parameters
Name	Description
max_results	int (Optional) The maximum number of blobs to return.
page_token	str (Optional) If present, return the next batch of blobs, using the value, which must correspond to the nextPageToken value returned in the previous response. Deprecated: use the pages property of the returned iterator instead of manually passing the token.
prefix	str (Optional) Prefix used to filter blobs.
delimiter	str (Optional) Delimiter, used with prefix to emulate hierarchy.
start_offset	str (Optional) Filter results to objects whose names are lexicographically equal to or after startOffset. If endOffset is also set, the objects listed will have names between startOffset (inclusive) and endOffset (exclusive).
end_offset	str (Optional) Filter results to objects whose names are lexicographically before endOffset. If startOffset is also set, the objects listed will have names between startOffset (inclusive) and endOffset (exclusive).
include_trailing_delimiter	boolean (Optional) If true, objects that end in exactly one instance of delimiter will have their metadata included in items in addition to prefixes.
versions	bool (Optional) Whether object versions should be returned as separate blobs.
projection	str (Optional) If used, must be 'full' or 'noAcl'. Defaults to 'noAcl'. Specifies the set of properties to return.
fields	str (Optional) Selector specifying which fields to include in a partial response. Must be a list of fields. For example to get a partial response with just the next page token and the name and language of each blob returned: 'items(name,contentLanguage),nextPageToken'. See: https://cloud.google.com/storage/docs/json_api/v1/parameters#fields
client	Client (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
google.api_core.page_iterator.Iterator	Iterator of all Blob in this bucket matching the arguments. .. rubric:: Example List blobs in the bucket with user_project. >>> from google.cloud import storage >>> client = storage.Client() >>> bucket = storage.Bucket(client, "my-bucket-name", user_project="my-project") >>> all_blobs = list(client.list_blobs(bucket))

list_notifications

list_notifications(client=None, timeout=60, retry=<google.api_core.retry.Retry object>)

List Pub / Sub notifications for this bucket.

See: https://cloud.google.com/storage/docs/json_api/v1/notifications/list

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

Parameters
Name	Description
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
list of .BucketNotification	notification instances

lock_retention_policy

lock_retention_policy(client=None, timeout=60, retry=<google.api_core.retry.Retry object>)

Lock the bucket's retention policy.

Parameters
Name	Description
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the blob's bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
ValueError	if the bucket has no metageneration (i.e., new or never reloaded); if the bucket has no retention policy assigned; if the bucket's retention policy is already locked.

make_private

make_private(recursive=False, future=False, client=None, timeout=60, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Update bucket's ACL, revoking read access for anonymous users.

Parameters
Name	Description
recursive	bool If True, this will make all blobs inside the bucket private as well.
future	bool If True, this will make all objects created in the future private as well.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
if_metageneration_match	long (Optional) Make the operation conditional on whether the blob's current metageneration matches the given value.
if_metageneration_not_match	long (Optional) Make the operation conditional on whether the blob's current metageneration does not match the given value.
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
ValueError	If recursive is True, and the bucket contains more than 256 blobs. This is to prevent extremely long runtime of this method. For such buckets, iterate over the blobs returned by list_blobs and call make_private for each blob.

make_public

make_public(recursive=False, future=False, client=None, timeout=60, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Update bucket's ACL, granting read access to anonymous users.

Parameters
Name	Description
recursive	bool If True, this will make all blobs inside the bucket public as well.
future	bool If True, this will make all objects created in the future public as well.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
if_metageneration_match	long (Optional) Make the operation conditional on whether the blob's current metageneration matches the given value.
if_metageneration_not_match	long (Optional) Make the operation conditional on whether the blob's current metageneration does not match the given value.
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Exceptions
Type	Description
ValueError	If recursive is True, and the bucket contains more than 256 blobs. This is to prevent extremely long runtime of this method. For such buckets, iterate over the blobs returned by list_blobs and call make_public for each blob.

notification

notification(
    topic_name=None,
    topic_project=None,
    custom_attributes=None,
    event_types=None,
    blob_name_prefix=None,
    payload_format="NONE",
    notification_id=None,
)

Factory: create a notification resource for the bucket.

See: .BucketNotification for parameters.

patch

patch(client=None, timeout=60, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Sends all changed properties in a PATCH request.

Updates the _properties with the response from the backend.

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

Parameters
Name	Description
client	Client or NoneType the client to use. If not passed, falls back to the client stored on the current object.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
if_metageneration_match	long (Optional) Make the operation conditional on whether the blob's current metageneration matches the given value.
if_metageneration_not_match	long (Optional) Make the operation conditional on whether the blob's current metageneration does not match the given value.
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

path_helper

path_helper(bucket_name)

Relative URL path for a bucket.

Parameter
Name	Description
bucket_name	str The bucket name in the path.

Returns
Type	Description
str	The relative URL path for bucket_name.

reload

reload(client=None, projection='noAcl', timeout=60, if_etag_match=None, if_etag_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.api_core.retry.Retry object>)

Reload properties from Cloud Storage.

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

Parameters
Name	Description
client	Client or NoneType the client to use. If not passed, falls back to the client stored on the current object.
projection	str (Optional) If used, must be 'full' or 'noAcl'. Defaults to 'noAcl'. Specifies the set of properties to return.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
if_etag_match	Union[str, Set[str]] (Optional) Make the operation conditional on whether the bucket's current ETag matches the given value.
if_etag_not_match	Union[str, Set[str]]) (Optional) Make the operation conditional on whether the bucket's current ETag does not match the given value.
if_metageneration_match	long (Optional) Make the operation conditional on whether the bucket's current metageneration matches the given value.
if_metageneration_not_match	long (Optional) Make the operation conditional on whether the bucket's current metageneration does not match the given value.
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

rename_blob

rename_blob(blob, new_name, client=None, if_generation_match=None, if_generation_not_match=None, if_metageneration_match=None, if_metageneration_not_match=None, if_source_generation_match=None, if_source_generation_not_match=None, if_source_metageneration_match=None, if_source_metageneration_not_match=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Rename the given blob using copy and delete operations.

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

Effectively, copies blob to the same bucket with a new name, then deletes the blob.

Warning: This method will first duplicate the data and then delete the old blob. This means that with very large objects renaming could be a very (temporarily) costly or a very slow operation. If you need more control over the copy and deletion, instead use <xref uid="google.cloud.storage.blob.Blob">google.cloud.storage.blob.Blob</xref>.copy_to and <xref uid="google.cloud.storage.blob.Blob.delete">google.cloud.storage.blob.Blob.delete</xref> directly.

Parameters
Name	Description
blob	Blob The blob to be renamed.
new_name	str The new name for this blob.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
if_generation_match	long (Optional) See :ref:using-if-generation-match Note that the generation to be matched is that of the destination blob.
if_generation_not_match	long (Optional) See :ref:using-if-generation-not-match Note that the generation to be matched is that of the destination blob.
if_metageneration_match	long (Optional) See :ref:using-if-metageneration-match Note that the metageneration to be matched is that of the destination blob.
if_metageneration_not_match	long (Optional) See :ref:using-if-metageneration-not-match Note that the metageneration to be matched is that of the destination blob.
if_source_generation_match	long (Optional) Makes the operation conditional on whether the source object's generation matches the given value. Also used in the (implied) delete request.
if_source_generation_not_match	long (Optional) Makes the operation conditional on whether the source object's generation does not match the given value. Also used in the (implied) delete request.
if_source_metageneration_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration matches the given value. Also used in the (implied) delete request.
if_source_metageneration_not_match	long (Optional) Makes the operation conditional on whether the source object's current metageneration does not match the given value. Also used in the (implied) delete request.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
Blob	The newly-renamed blob.

set_iam_policy

set_iam_policy(policy, client=None, timeout=60, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Update the IAM policy for the bucket.

See https://cloud.google.com/storage/docs/json_api/v1/buckets/setIamPolicy

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

Parameters
Name	Description
policy	google.api_core.iam.Policy policy instance used to update bucket's IAM policy.
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
google.api_core.iam.Policy	the policy instance, based on the resource returned from the setIamPolicy API request.

test_iam_permissions

test_iam_permissions(permissions, client=None, timeout=60, retry=<google.api_core.retry.Retry object>)

API call: test permissions

See https://cloud.google.com/storage/docs/json_api/v1/buckets/testIamPermissions

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

Parameters
Name	Description
permissions	list of string the permissions to check
client	Client or NoneType (Optional) The client to use. If not passed, falls back to the client stored on the current bucket.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries

Returns
Type	Description
list of string	the permissions returned by the testIamPermissions API request.

update

update(client=None, timeout=60, if_metageneration_match=None, if_metageneration_not_match=None, retry=<google.cloud.storage.retry.ConditionalRetryPolicy object>)

Sends all properties in a PUT request.

Updates the _properties with the response from the backend.

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

Parameters
Name	Description
client	Client or NoneType the client to use. If not passed, falls back to the client stored on the current object.
timeout	float or tuple (Optional) The amount of time, in seconds, to wait for the server response. See: configuring_timeouts
if_metageneration_match	long (Optional) Make the operation conditional on whether the blob's current metageneration matches the given value.
if_metageneration_not_match	long (Optional) Make the operation conditional on whether the blob's current metageneration does not match the given value.
retry	google.api_core.retry.Retry or google.cloud.storage.retry.ConditionalRetryPolicy (Optional) How to retry the RPC. See: configuring_retries