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# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
import os
import time
from azure.keyvault.certificates import CertificateClient, CertificatePolicy
from azure.identity import DefaultAzureCredential
from azure.core.exceptions import HttpResponseError
# ----------------------------------------------------------------------------------------------------------
# Prerequisites:
# 1. An Azure Key Vault (https://docs.microsoft.com/en-us/azure/key-vault/quick-create-cli)
#
# 2. azure-keyvault-certificates and azure-identity packages (pip install these)
#
# 3. Set Environment variables AZURE_CLIENT_ID, AZURE_TENANT_ID, AZURE_CLIENT_SECRET, VAULT_URL
# (See https://github.com/Azure/azure-sdk-for-python/tree/master/sdk/keyvault/azure-keyvault-keys#authenticate-the-client)
#
# ----------------------------------------------------------------------------------------------------------
# Sample - demonstrates the basic backup and restore operations on a vault(certificates) resource for Azure Key Vault
#
# 1. Create a certificate (begin_create_certificate)
#
# 2. Backup a certificate (backup_certificate)
#
# 3. Delete a certificate (begin_delete_certificate)
#
# 4. Restore a certificate (restore_certificate_backup)
# ----------------------------------------------------------------------------------------------------------
# Instantiate a certificate client that will be used to call the service.
# Notice that the client is using default Azure credentials.
# To make default credentials work, ensure that environment variables 'AZURE_CLIENT_ID',
# 'AZURE_CLIENT_SECRET' and 'AZURE_TENANT_ID' are set with the service principal credentials.
VAULT_URL = os.environ["VAULT_URL"]
credential = DefaultAzureCredential()
client = CertificateClient(vault_url=VAULT_URL, credential=credential)
try:
print("\n.. Create Certificate")
cert_name = "BackupRestoreCertificate"
# Let's create a certificate for your key vault.
# if the certificate already exists in the Key Vault, then a new version of the certificate is created.
# A long running poller is returned for the create certificate operation.
create_certificate_poller = client.begin_create_certificate(
certificate_name=cert_name, policy=CertificatePolicy.get_default()
)
# The result call awaits the completion of the create certificate operation and returns the final result.
# It will return a certificate if creation is successful, and will return the CertificateOperation if not.
certificate = create_certificate_poller.result()
print("Certificate with name '{0}' created.".format(cert_name))
# Backups are good to have, if in case certificates gets deleted accidentally.
# For long term storage, it is ideal to write the backup to a file.
print("\n.. Create a backup for an existing certificate")
certificate_backup = client.backup_certificate(cert_name)
print("Backup created for certificate with name '{0}'.".format(cert_name))
# The storage account certificate is no longer in use, so you can delete it.
print("\n.. Delete the certificate")
client.begin_delete_certificate(cert_name).wait()
print("Deleted certificate '{0}'".format(cert_name))
# In future, if the certificate is required again, we can use the backup value to restore it in the Key Vault.
print("\n.. Restore the certificate from the backup")
certificate = client.restore_certificate_backup(certificate_backup)
print("Restored Certificate with name '{0}'".format(certificate.name))
except HttpResponseError as e:
print("\nrun_sample has caught an error. {0}".format(e.message))
finally:
print("\nrun_sample done")
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