Torch Object Storage
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- Documentation
Torch Object StorageSDK ReferencePythonBucket interfaceManage bucket configurationManage bucket ACL (Python SDK)
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Manage bucket ACL (Python SDK)
Copy pageDownload PDFManage bucket ACL (Python SDK)
Bucket is the globally unique namespace of TOS, which is equivalent to a data container and is used to store object data. This article describes how to set and obtain read and write permissions (ACLs) for buckets.
Set bucket access
warning
To set the read and write permissions of the bucket, you must have the tos: PutBucketACL permission, or have the WRITE_ACP bucket ACL permission. For details, see Overview.
Bucket ACL permissions
Bucket ACL permissions include the following five categories.
Permission | Description | Value |
Permission | Description | Value |
READ | Allows authorized parties to list objects in a bucket | tos.PermissionType.Permission_Read |
WRITE | Allows authorized parties to create, overwrite, and delete arbitrary objects in the bucket | tos.PermissionType.Permission_Write |
READ_ACP | Allows authorized parties to read bucket ACLs | tos.PermissionType.Permission_Read_Acp |
WRITE_ACP | Allows authorized parties to write to bucket ACLs | tos.PermissionType.Permission_Write_Acp |
FULL_CONTROL | Assigns READ, WRITE, READ_ACP and WRITE_ACP permissions on buckets to authorized parties | tos.PermissionType.Permission_Full_Control |
It can be set by filling in the detailed ACL permission information in the request body or in the request header.
Fill in the detailed ACL permission information in the request body
The following code is used to set permission information for bucket-test in the request body.
import os
import tos
from tos import GranteeType, CannedType, PermissionType
from tos.models2 import Grantee, Grant, Owner
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
try:
client = tos.TosClientV2(ak, sk, endpoint, region)
# Grantee is the account ID
grantee1 = Grantee(GranteeType.Grantee_User, id='account id', display_name='account display name')
# Grantee is all users in a predefined group
grantee2 = Grantee(GranteeType.Grantee_Group, canned=CannedType.Canned_All_Users)
# Grant Permission_Full_Control to the specified account ID
grant_1 = Grant(grantee1, PermissionType.Permission_Full_Control)
# Grant Permission_Read to all users
grant_2 = Grant(grantee2, PermissionType.Permission_Read)
client.put_bucket_acl(bucket_name, grants=[grant_1, grant_2], owner=Owner("object owner id", 'object owner name'))
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Set access permissions in the request header
The read and write permissions of the bucket set through the x-tos-acl request header have the following four categories.
Permission | Description | Value |
Permission | Description | Value |
private | Private. The bucket owner has FULL_CONTROL permissions, other users do not have permissions to operate on the object. | tos.ACLType.ACL_Private |
public reading | Public reading. The owner of the bucket has FULL_CONTROL privileges, other users only have READ privileges on the bucket. | tos.ACLType.ACL_Public_Read |
public reading and writing | Public reading and writing. All users have FULL_CONTROL permissions. | tos.ACLType.ACL_Public_Read_Write |
authenticated user read | The bucket owner has FULL_CONTROL privileges, and the authenticated user has READ privileges on the bucket. | tos.ACLType.ACL_Authenticated_Read |
The following code sets the read and write permissions for bucket-test using x-tos-acl.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
try:
# Create a TosClientV2 object to perform operations on buckets and objects
client = tos.TosClientV2(ak, sk, endpoint, region)
# Set the bucket permission to private
client.put_bucket_acl(bucket_name, acl=tos.ACLType.ACL_Private)
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
The following code uses x-tos-grant- * to request read and write permissions to bucket-test.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
try:
# Create a TosClientV2 object to perform operations on buckets and objects
client = tos.TosClientV2(ak, sk, endpoint, region)
# Set user ID 1000000001 with FULL_CONTROL access, allowing all users to have READ permission on the bucket.
client.put_bucket_acl(bucket_name, grant_full_control='id="1000000001"', grant_read='canned="AllUsers"')
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
Gain access to the bucket
warning
To gain access to the bucket, you must have tos: GetBucketACL permission, or have READ_ACP bucket ACL permission, see Overview.
The following code is used to gain access to the bucket-test.
import os
import tos
# Retrieve AKSK information from environment variables.
ak = os.getenv('TOS_ACCESS_KEY')
sk = os.getenv('TOS_SECRET_KEY')
endpoint = "your endpoint"
region = "your region"
bucket_name = "bucket-test"
try:
# Create TosClientV2 object to perform operations on buckets and objects
client = tos.TosClientV2(ak, sk, endpoint, region)
# Get bucket permissions
out = client.get_bucket_acl(bucket_name)
print('owner_id={}'.format(out.owner.id))
for grant in out.grants:
print('permission={}'.format(grant.permission.value))
print('id={}'.format(grant.grantee.id))
print('type={}'.format(grant.grantee.type))
print('canned={}'.format(grant.grantee.canned))
except tos.exceptions.TosClientError as e:
# Operation failed, catch client error, usually caused by invalid request parameters or network issues
print('fail with client error, message:{}, cause: {}'.format(e.message, e.cause))
except tos.exceptions.TosServerError as e:
# Operation failed, catch server error, detailed error information can be obtained from the response
print('fail with server error, code: {}'.format(e.code))
# request id can be used to locate specific issues, it is strongly recommended to save it in the log.
print('error with request id: {}'.format(e.request_id))
print('error with message: {}'.format(e.message))
print('error with http code: {}'.format(e.status_code))
print('error with ec: {}'.format(e.ec))
print('error with request url: {}'.format(e.request_url))
except Exception as e:
print('fail with unknown error: {}'.format(e))
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Last updated: 2026.08.03 10:41:23
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