Key Backup and Recovery

def backup_key(name: str, **kwargs) -> bytes:
    """
    Back up a key from the Key Vault.

    Parameters:
    - name: The name of the key to back up

    Returns:
    bytes: The key backup as opaque bytes (includes all versions and metadata)
    
    Raises:
    - ResourceNotFoundError: If the key doesn't exist
    - ForbiddenError: If backup permission is not granted
    """

def restore_key_backup(backup: bytes, **kwargs) -> KeyVaultKey:
    """
    Restore a key from a backup.

    Parameters:
    - backup: The key backup bytes from backup_key()

    Returns:
    KeyVaultKey: The restored key
    
    Raises:
    - InvalidArgumentError: If backup data is invalid
    - ConflictError: If a key with the same name already exists
    - ForbiddenError: If restore permission is not granted
    """

from azure.keyvault.keys import KeyClient
from azure.identity import DefaultAzureCredential

client = KeyClient("https://vault.vault.azure.net/", DefaultAzureCredential())

# Create a key to backup
key = client.create_rsa_key("backup-demo-key", size=2048)

# Backup the key
backup_data = client.backup_key("backup-demo-key")
print(f"Backup size: {len(backup_data)} bytes")

# Save backup to file (optional)
with open("key-backup.bin", "wb") as f:
    f.write(backup_data)

# Delete the key
client.begin_delete_key("backup-demo-key").wait()
client.purge_deleted_key("backup-demo-key")

# Restore the key from backup
restored_key = client.restore_key_backup(backup_data)
print(f"Restored key: {restored_key.name}")

# Restore from file (optional)
with open("key-backup.bin", "rb") as f:
    backup_data = f.read()
    restored_key = client.restore_key_backup(backup_data)

def list_deleted_keys(**kwargs) -> ItemPaged[DeletedKey]:
    """
    List all soft-deleted keys in the vault.

    Returns:
    ItemPaged[DeletedKey]: Paginated list of deleted keys with recovery information
    """

def get_deleted_key(name: str, **kwargs) -> DeletedKey:
    """
    Get information about a soft-deleted key.

    Parameters:
    - name: The name of the deleted key

    Returns:
    DeletedKey: The deleted key with recovery information
    
    Raises:
    - ResourceNotFoundError: If the deleted key doesn't exist
    """

def begin_recover_deleted_key(name: str, **kwargs) -> LROPoller[KeyVaultKey]:
    """
    Begin recovering a soft-deleted key.

    Parameters:
    - name: The name of the deleted key to recover

    Returns:
    LROPoller[KeyVaultKey]: Long-running operation poller for the recovery
    
    Raises:
    - ResourceNotFoundError: If the deleted key doesn't exist
    - ConflictError: If a key with the same name already exists (active)
    """

def purge_deleted_key(name: str, **kwargs) -> None:
    """
    Permanently delete a soft-deleted key (cannot be recovered).

    Parameters:
    - name: The name of the deleted key to purge
    
    Raises:
    - ResourceNotFoundError: If the deleted key doesn't exist
    - ForbiddenError: If purge permission is not granted
    """

# Delete a key (soft delete)
delete_poller = client.begin_delete_key("my-key")
deleted_key = delete_poller.result()
print(f"Key deleted on: {deleted_key.deleted_date}")
print(f"Scheduled purge date: {deleted_key.scheduled_purge_date}")

# List all deleted keys
print("Deleted keys:")
for deleted_key in client.list_deleted_keys():
    print(f"- {deleted_key.name} (deleted: {deleted_key.deleted_date})")

# Get specific deleted key info
deleted_key = client.get_deleted_key("my-key")
print(f"Recovery ID: {deleted_key.recovery_id}")

# Recover a deleted key
recover_poller = client.begin_recover_deleted_key("my-key")
recovered_key = recover_poller.result()
print(f"Recovered key: {recovered_key.name}")

# Permanently delete (purge) a key
client.purge_deleted_key("my-key")
print("Key permanently deleted")

# Backup from source vault
source_client = KeyClient("https://source-vault.vault.azure.net/", credential)
backup_data = source_client.backup_key("migration-key")

# Restore to destination vault
dest_client = KeyClient("https://dest-vault.vault.azure.net/", credential)
restored_key = dest_client.restore_key_backup(backup_data)

import os
from datetime import datetime

# Regular backup process
keys_to_backup = ["critical-key-1", "critical-key-2", "signing-key"]
backup_dir = "/secure/backups"

for key_name in keys_to_backup:
    try:
        backup_data = client.backup_key(key_name)
        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        backup_file = os.path.join(backup_dir, f"{key_name}_{timestamp}.backup")
        
        with open(backup_file, "wb") as f:
            f.write(backup_data)
        print(f"Backed up {key_name} to {backup_file}")
    except Exception as e:
        print(f"Failed to backup {key_name}: {e}")

# Recovery process
def recover_from_backup(backup_file_path: str):
    with open(backup_file_path, "rb") as f:
        backup_data = f.read()
    
    try:
        restored_key = client.restore_key_backup(backup_data)
        print(f"Successfully restored key: {restored_key.name}")
        return restored_key
    except Exception as e:
        print(f"Failed to restore from {backup_file_path}: {e}")
        return None

def recover_accidentally_deleted_key(key_name: str):
    """Recover a key that was accidentally deleted."""
    try:
        # Check if key is soft-deleted
        deleted_key = client.get_deleted_key(key_name)
        print(f"Found deleted key: {deleted_key.name}")
        print(f"Deleted on: {deleted_key.deleted_date}")
        print(f"Scheduled purge: {deleted_key.scheduled_purge_date}")
        
        # Recover the key
        recover_poller = client.begin_recover_deleted_key(key_name)
        recovered_key = recover_poller.result()
        print(f"Successfully recovered key: {recovered_key.name}")
        return recovered_key
        
    except ResourceNotFoundError:
        print(f"Key '{key_name}' not found in deleted keys")
        return None
    except Exception as e:
        print(f"Error recovering key: {e}")
        return None

# Example usage
recovered_key = recover_accidentally_deleted_key("accidentally-deleted-key")

class DeletedKey(KeyVaultKey):
    """A deleted key's properties, cryptographic material and deletion information."""
    # Inherits all properties from KeyVaultKey, plus:
    deleted_date: datetime
    recovery_id: str
    scheduled_purge_date: datetime

class LROPoller:
    """Long-running operation poller."""
    def result(timeout: int = None) -> Any:
        """Get the final result of the long-running operation."""
    
    def wait(timeout: int = None) -> None:
        """Wait for the operation to complete."""
    
    def done() -> bool:
        """Check if the operation is complete."""
    
    def status() -> str:
        """Get the current status of the operation."""

class ItemPaged:
    """Paginated collection of items."""
    def __iter__():
        """Iterate over all items across pages."""
    
    def by_page():
        """Iterate page by page."""

from azure.core.exceptions import (
    ResourceNotFoundError,
    ConflictError,
    ForbiddenError,
    InvalidArgumentError
)

def safe_backup_key(client: KeyClient, key_name: str) -> bytes:
    """Safely backup a key with error handling."""
    try:
        return client.backup_key(key_name)
    except ResourceNotFoundError:
        print(f"Key '{key_name}' not found")
        return None
    except ForbiddenError:
        print(f"Insufficient permissions to backup key '{key_name}'")
        return None
    except Exception as e:
        print(f"Unexpected error backing up key '{key_name}': {e}")
        return None

def safe_restore_key(client: KeyClient, backup_data: bytes) -> KeyVaultKey:
    """Safely restore a key with error handling."""
    try:
        return client.restore_key_backup(backup_data)
    except InvalidArgumentError:
        print("Invalid backup data")
        return None
    except ConflictError:
        print("Key with same name already exists")
        return None
    except ForbiddenError:
        print("Insufficient permissions to restore key")
        return None
    except Exception as e:
        print(f"Unexpected error restoring key: {e}")
        return None