# -*- coding: utf-8 -*- #
# Copyright 2018 Google LLC. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Export Binary Authorization policy command."""

from __future__ import absolute_import
from __future__ import division
from __future__ import unicode_literals

from googlecloudsdk.api_lib.container.binauthz import apis
from googlecloudsdk.api_lib.container.binauthz import policies
from googlecloudsdk.api_lib.container.binauthz import util
from googlecloudsdk.calliope import base
from googlecloudsdk.core.exceptions import Error

OLD_SYSTEM_POLICY_PROJECT_NAME = 'binauthz-global-policy'


@base.DefaultUniverseOnly
class Export(base.Command):
  """Export the Binary Authorization policy for the current project.

  This function's default output is a valid policy YAML file. If dumped to a
  file and edited, the new policy can be provided to the `$ {parent_command}
  import` command to cause these edits to be reflected in the project policy.

  ## EXAMPLES

  To export the current project's policy:

      $ {command} > my_policy.yaml
  """

  def Run(self, args):
    api_version = apis.GetApiVersion(self.ReleaseTrack())
    ref = util.GetPolicyRef()
    if ref.Name() == OLD_SYSTEM_POLICY_PROJECT_NAME:
      raise Error(
          'The Binary Authorization system policy is no longer accessible via '
          'the binauthz-global-policy project. Use the following command to '
          'display the system policy:\n'
          '    $ gcloud alpha container binauthz policy export-system-policy\n'
          'For details, see https://cloud.google.com/binary-authorization/docs/'
          'key-concepts#google-maintained_system_images.')
    return policies.Client(api_version).Get(ref)
