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# -------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for
# license information.
# --------------------------------------------------------------------------
import time
import uuid
from datetime import datetime, timedelta
from azure.storage.blob import (
BlockBlobService,
ContainerPermissions,
BlobPermissions,
PublicAccess,
)
from azure.storage.common import (
AccessPolicy,
ResourceTypes,
AccountPermissions,
)
class BlobSasSamples():
def __init__(self, account):
self.account = account
def run_all_samples(self):
self.service = self.account.create_block_blob_service()
self.container_sas()
self.blob_sas()
self.account_sas()
self.public_access()
self.container_acl()
self.sas_with_signed_identifiers()
def _get_container_reference(self, prefix='container'):
return '{}{}'.format(prefix, str(uuid.uuid4()).replace('-', ''))
def _create_container(self, prefix='container'):
container_name = self._get_container_reference(prefix)
self.service.create_container(container_name)
return container_name
def public_access(self):
container_name = self._get_container_reference()
# Create a container with 'Blob' level public access
self.service.create_container(container_name, public_access=PublicAccess.Blob)
self.service.create_blob_from_text(container_name, 'blob1', 'hello world')
# Get the public access level
acl = self.service.get_container_acl(container_name)
access = acl.public_access # 'blob'
# Show a particular blob can be read with no credentials
anonymous_service = BlockBlobService(self.account.account_name)
anonymous_service.get_blob_to_text(container_name, 'blob1')
# Set the container public access level to 'Container'
self.service.set_container_acl(container_name, public_access=PublicAccess.Container)
# Wait 30 seconds for it to take effect
time.sleep(30)
# Show blobs can be listed with no credentials
anonymous_service = BlockBlobService(self.account.account_name)
anonymous_service.list_blobs(container_name)
# Turn container public access off by simply not sending it with set_container_acl
self.service.set_container_acl(container_name)
# Wait 30 seconds for it to take effect
time.sleep(30)
try:
anonymous_service.get_blob_to_text(container_name, 'blob1')
except:
print('Public access is turned off')
pass
self.service.delete_container(container_name)
def container_sas(self):
container_name = self._create_container()
self.service.create_blob_from_text(container_name, 'blob1', b'hello world')
# Access only to the blobs in the given container
# Read permissions to access blobs
# Expires in an hour
token = self.service.generate_container_shared_access_signature(
container_name,
ContainerPermissions.READ,
datetime.utcnow() + timedelta(hours=1),
)
# Create a service and use the SAS
sas_service = BlockBlobService(
account_name=self.account.account_name,
sas_token=token,
)
blob = sas_service.get_blob_to_text(container_name, 'blob1')
content = blob.content # hello world
self.service.delete_container(container_name)
def blob_sas(self):
container_name = self._create_container()
self.service.create_blob_from_text(container_name, 'blob1', b'hello world')
# Read access only to this particular blob
# Expires in an hour
token = self.service.generate_blob_shared_access_signature(
container_name,
'blob1',
BlobPermissions.READ,
datetime.utcnow() + timedelta(hours=1),
)
# Create a service and use the SAS
sas_service = BlockBlobService(
account_name=self.account.account_name,
sas_token=token,
)
blob = sas_service.get_blob_to_text(container_name, 'blob1')
content = blob.content # hello world
self.service.delete_container(container_name)
def account_sas(self):
container_name = self._create_container()
metadata = {'val1': 'foo', 'val2': 'blah'}
self.service.set_container_metadata(container_name, metadata=metadata)
# Access to read operations on the containers themselves
# Expires in an hour
token = self.service.generate_account_shared_access_signature(
ResourceTypes.CONTAINER,
AccountPermissions.READ,
datetime.utcnow() + timedelta(hours=1),
)
# Create a service and use the SAS
sas_service = BlockBlobService(
account_name=self.account.account_name,
sas_token=token,
)
metadata = sas_service.get_container_metadata(container_name) # metadata={'val1': 'foo', 'val2': 'blah'}
self.service.delete_container(container_name)
def container_acl(self):
container_name = self._create_container()
# Create a READ level access policy and set it on the container
access_policy = AccessPolicy(permission=ContainerPermissions.READ,
expiry=datetime.utcnow() + timedelta(hours=1))
identifiers = {'id': access_policy}
self.service.set_container_acl(container_name, identifiers)
# Wait 30 seconds for acl to propagate
time.sleep(30)
acl = self.service.get_container_acl(container_name) # {id: AccessPolicy()}
# Replaces values, does not merge
access_policy = AccessPolicy(permission=ContainerPermissions.READ,
expiry=datetime.utcnow() + timedelta(hours=1))
identifiers = {'id2': access_policy}
self.service.set_container_acl(container_name, identifiers)
# Wait 30 seconds for acl to propagate
time.sleep(30)
acl = self.service.get_container_acl(container_name) # {id2: AccessPolicy()}
# Clear
self.service.set_container_acl(container_name)
# Wait 30 seconds for acl to propagate
time.sleep(30)
acl = self.service.get_container_acl(container_name) # {}
self.service.delete_container(container_name)
def sas_with_signed_identifiers(self):
container_name = self._create_container()
self.service.create_blob_from_text(container_name, 'blob1', b'hello world')
# Set access policy on container
access_policy = AccessPolicy(permission=ContainerPermissions.READ,
expiry=datetime.utcnow() + timedelta(hours=1))
identifiers = {'id': access_policy}
acl = self.service.set_container_acl(container_name, identifiers)
# Wait 30 seconds for acl to propagate
time.sleep(30)
# Indicates to use the access policy set on the container
token = self.service.generate_container_shared_access_signature(
container_name,
id='id'
)
# Create a service and use the SAS
sas_service = BlockBlobService(
account_name=self.account.account_name,
sas_token=token,
)
blob = sas_service.get_blob_to_text(container_name, 'blob1')
content = blob.content # hello world
self.service.delete_container(container_name)
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