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# -*- coding: utf-8 -*-
# Copyright 2011 Google Inc. 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.
"""Implementation of default object acl command for Google Cloud Storage."""

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

import os

from gslib import gcs_json_api
from gslib import metrics
from gslib.cloud_api import AccessDeniedException
from gslib.cloud_api import BadRequestException
from gslib.cloud_api import Preconditions
from gslib.cloud_api import ServiceException
from gslib.command import Command
from gslib.command import SetAclExceptionHandler
from gslib.command import SetAclFuncWrapper
from gslib.command_argument import CommandArgument
from gslib.cs_api_map import ApiSelector
from gslib.exception import CommandException
from gslib.help_provider import CreateHelpText
from gslib.storage_url import StorageUrlFromString
from gslib.storage_url import UrlsAreForSingleProvider
from gslib.third_party.storage_apitools import storage_v1_messages as apitools_messages
from gslib.utils import acl_helper
from gslib.utils.constants import NO_MAX
from gslib.utils.retry_util import Retry
from gslib.utils.shim_util import GcloudStorageFlag
from gslib.utils.shim_util import GcloudStorageMap
from gslib.utils.translation_helper import PRIVATE_DEFAULT_OBJ_ACL

_SET_SYNOPSIS = """
  gsutil defacl set (<file-path>|<predefined-acl>) gs://<bucket_name>...
"""

_GET_SYNOPSIS = """
  gsutil defacl get gs://<bucket_name>
"""

_CH_SYNOPSIS = """
  gsutil defacl ch [-f] -u|-g|-d|-p <grant>... gs://<bucket_name>...
"""

_SET_DESCRIPTION = """
<B>SET</B>
  The ``defacl set`` command sets default object ACLs for the specified
  buckets. If you specify a default object ACL for a certain bucket, Cloud
  Storage applies the default object ACL to all new objects uploaded to that
  bucket, unless an ACL for that object is separately specified during upload.

  Similar to the ``acl set`` command, the ``defacl set`` command specifies either
  a predefined ACL or the path to a file that contains ACL text. See "gsutil help
  acl" for examples of editing and setting ACLs via the acl command. See
  `Predefined ACLs
  <https://cloud.google.com/storage/docs/access-control/lists#predefined-acl>`_
  for a list of predefined ACLs.

  Setting a default object ACL on a bucket provides a convenient way to ensure
  newly uploaded objects have a specific ACL. If you don't set the bucket's
  default object ACL, it will default to project-private. If you then upload
  objects that need a different ACL, you will need to perform a separate ACL
  update operation for each object. Depending on how many objects require
  updates, this could be very time-consuming.
"""

_GET_DESCRIPTION = """
<B>GET</B>
  Gets the default ACL text for a bucket, which you can save and edit
  for use with the "defacl set" command.
"""

_CH_DESCRIPTION = """
<B>CH</B>
  The "defacl ch" (or "defacl change") command updates the default object
  access control list for a bucket. The syntax is shared with the "acl ch"
  command, so see the "CH" section of "gsutil help acl" for the full help
  description.

<B>CH EXAMPLES</B>
  Grant anyone on the internet READ access by default to any object created
  in the bucket example-bucket:

    gsutil defacl ch -u AllUsers:R gs://example-bucket

  NOTE: By default, publicly readable objects are served with a Cache-Control
  header allowing such objects to be cached for 3600 seconds. If you need to
  ensure that updates become visible immediately, you should set a
  Cache-Control header of "Cache-Control:private, max-age=0, no-transform" on
  such objects. For help doing this, see "gsutil help setmeta".

  Add the user john.doe@example.com to the default object ACL on bucket
  example-bucket with READ access:

    gsutil defacl ch -u john.doe@example.com:READ gs://example-bucket

  Add the group admins@example.com to the default object ACL on bucket
  example-bucket with OWNER access:

    gsutil defacl ch -g admins@example.com:O gs://example-bucket

  Remove the group admins@example.com from the default object ACL on bucket
  example-bucket:

    gsutil defacl ch -d admins@example.com gs://example-bucket

  Add the owners of project example-project-123 to the default object ACL on
  bucket example-bucket with READ access:

    gsutil defacl ch -p owners-example-project-123:R gs://example-bucket

  NOTE: You can replace 'owners' with 'viewers' or 'editors' to grant access
  to a project's viewers/editors respectively.

<B>CH OPTIONS</B>
  The "ch" sub-command has the following options

  -d          Remove all roles associated with the matching entity.

  -f          Normally gsutil stops at the first error. The -f option causes
              it to continue when it encounters errors. With this option the
              gsutil exit status will be 0 even if some ACLs couldn't be
              changed.

  -g          Add or modify a group entity's role.

  -p          Add or modify a project viewers/editors/owners role.

  -u          Add or modify a user entity's role.
"""

_SYNOPSIS = (_SET_SYNOPSIS + _GET_SYNOPSIS.lstrip('\n') +
             _CH_SYNOPSIS.lstrip('\n') + '\n\n')

_DESCRIPTION = """
  The defacl command has three sub-commands:
""" + '\n'.join([_SET_DESCRIPTION + _GET_DESCRIPTION + _CH_DESCRIPTION])

_DETAILED_HELP_TEXT = CreateHelpText(_SYNOPSIS, _DESCRIPTION)

_get_help_text = CreateHelpText(_GET_SYNOPSIS, _GET_DESCRIPTION)
_set_help_text = CreateHelpText(_SET_SYNOPSIS, _SET_DESCRIPTION)
_ch_help_text = CreateHelpText(_CH_SYNOPSIS, _CH_DESCRIPTION)


class DefAclCommand(Command):
  """Implementation of gsutil defacl command."""

  # Command specification. See base class for documentation.
  command_spec = Command.CreateCommandSpec(
      'defacl',
      command_name_aliases=['setdefacl', 'getdefacl', 'chdefacl'],
      usage_synopsis=_SYNOPSIS,
      min_args=2,
      max_args=NO_MAX,
      supported_sub_args='fg:u:d:p:',
      file_url_ok=False,
      provider_url_ok=False,
      urls_start_arg=1,
      gs_api_support=[ApiSelector.XML, ApiSelector.JSON],
      gs_default_api=ApiSelector.JSON,
      argparse_arguments={
          'set': [
              CommandArgument.MakeFileURLOrCannedACLArgument(),
              CommandArgument.MakeZeroOrMoreCloudBucketURLsArgument()
          ],
          'get': [CommandArgument.MakeNCloudBucketURLsArgument(1)],
          'ch': [CommandArgument.MakeZeroOrMoreCloudBucketURLsArgument()],
      },
  )
  # Help specification. See help_provider.py for documentation.
  help_spec = Command.HelpSpec(
      help_name='defacl',
      help_name_aliases=['default acl', 'setdefacl', 'getdefacl', 'chdefacl'],
      help_type='command_help',
      help_one_line_summary='Get, set, or change default ACL on buckets',
      help_text=_DETAILED_HELP_TEXT,
      subcommand_help_text={
          'get': _get_help_text,
          'set': _set_help_text,
          'ch': _ch_help_text,
      },
  )

  def get_gcloud_storage_args(self):
    sub_command = self.args.pop(0)
    if sub_command == 'get':
      gcloud_storage_map = GcloudStorageMap(
          gcloud_command=[
              'storage', 'buckets', 'describe',
              '--format=multi(defaultObjectAcl:format=json)', '--raw'
          ],
          flag_map={},
      )

    elif sub_command == 'set':
      acl_file_or_predefined_acl = self.args.pop(0)
      if (os.path.isfile(acl_file_or_predefined_acl)):
        gcloud_storage_map = GcloudStorageMap(
            gcloud_command=[
                'storage', 'buckets', 'update',
                '--default-object-acl-file=' + acl_file_or_predefined_acl
            ],
            flag_map={},
        )
      else:
        if acl_file_or_predefined_acl in (
            gcs_json_api.FULL_PREDEFINED_ACL_XML_TO_JSON_TRANSLATION):
          predefined_acl = (
              gcs_json_api.FULL_PREDEFINED_ACL_XML_TO_JSON_TRANSLATION[
                  acl_file_or_predefined_acl])
        else:
          predefined_acl = acl_file_or_predefined_acl
        gcloud_storage_map = GcloudStorageMap(
            gcloud_command=[
                'storage', 'buckets', 'update',
                '--predefined-default-object-acl=' + predefined_acl
            ],
            flag_map={},
        )

    elif sub_command == 'ch':
      self.ParseSubOpts()
      self.sub_opts = acl_helper.translate_sub_opts_for_shim(self.sub_opts)

      gcloud_storage_map = GcloudStorageMap(
          gcloud_command=['storage', 'buckets', 'update'],
          flag_map={
              '-g': GcloudStorageFlag('--add-default-object-acl-grant'),
              '-p': GcloudStorageFlag('--add-default-object-acl-grant'),
              '-u': GcloudStorageFlag('--add-default-object-acl-grant'),
              '-d': GcloudStorageFlag('--remove-default-object-acl-grant'),
              '-f': GcloudStorageFlag('--continue-on-error'),
          })

    return super().get_gcloud_storage_args(gcloud_storage_map)

  def _CalculateUrlsStartArg(self):
    if not self.args:
      self.RaiseWrongNumberOfArgumentsException()
    if (self.args[0].lower() == 'set' or
        self.command_alias_used == 'setdefacl'):
      return 1
    else:
      return 0

  def _SetDefAcl(self):
    if not StorageUrlFromString(self.args[-1]).IsBucket():
      raise CommandException('URL must name a bucket for the %s command' %
                             self.command_name)
    try:
      self.SetAclCommandHelper(SetAclFuncWrapper, SetAclExceptionHandler)
    except AccessDeniedException:
      self._WarnServiceAccounts()
      raise

  def _GetDefAcl(self):
    if not StorageUrlFromString(self.args[0]).IsBucket():
      raise CommandException('URL must name a bucket for the %s command' %
                             self.command_name)
    self.GetAndPrintAcl(self.args[0])

  def _ChDefAcl(self):
    """Parses options and changes default object ACLs on specified buckets."""
    self.parse_versions = True
    self.changes = []

    if self.sub_opts:
      for o, a in self.sub_opts:
        if o == '-g':
          self.changes.append(
              acl_helper.AclChange(a, scope_type=acl_helper.ChangeType.GROUP))
        if o == '-u':
          self.changes.append(
              acl_helper.AclChange(a, scope_type=acl_helper.ChangeType.USER))
        if o == '-p':
          self.changes.append(
              acl_helper.AclChange(a, scope_type=acl_helper.ChangeType.PROJECT))
        if o == '-d':
          self.changes.append(acl_helper.AclDel(a))

    if not self.changes:
      raise CommandException('Please specify at least one access change '
                             'with the -g, -u, or -d flags')

    if (not UrlsAreForSingleProvider(self.args) or
        StorageUrlFromString(self.args[0]).scheme != 'gs'):
      raise CommandException(
          'The "{0}" command can only be used with gs:// URLs'.format(
              self.command_name))

    bucket_urls = set()
    for url_arg in self.args:
      for result in self.WildcardIterator(url_arg):
        if not result.storage_url.IsBucket():
          raise CommandException(
              'The defacl ch command can only be applied to buckets.')
        bucket_urls.add(result.storage_url)

    for storage_url in bucket_urls:
      self.ApplyAclChanges(storage_url)

  @Retry(ServiceException, tries=3, timeout_secs=1)
  def ApplyAclChanges(self, url):
    """Applies the changes in self.changes to the provided URL."""
    bucket = self.gsutil_api.GetBucket(
        url.bucket_name,
        provider=url.scheme,
        fields=['defaultObjectAcl', 'metageneration'])

    # Default object ACLs can be blank if the ACL was set to private, or
    # if the user doesn't have permission. We warn about this with defacl get,
    # so just try the modification here and if the user doesn't have
    # permission they'll get an AccessDeniedException.
    current_acl = bucket.defaultObjectAcl

    if self._ApplyAclChangesAndReturnChangeCount(url, current_acl) == 0:
      self.logger.info('No changes to %s', url)
      return

    if not current_acl:
      # Use a sentinel value to indicate a private (no entries) default
      # object ACL.
      current_acl.append(PRIVATE_DEFAULT_OBJ_ACL)

    try:
      preconditions = Preconditions(meta_gen_match=bucket.metageneration)
      bucket_metadata = apitools_messages.Bucket(defaultObjectAcl=current_acl)
      self.gsutil_api.PatchBucket(url.bucket_name,
                                  bucket_metadata,
                                  preconditions=preconditions,
                                  provider=url.scheme,
                                  fields=['id'])
      self.logger.info('Updated default ACL on %s', url)
    except BadRequestException as e:
      # Don't retry on bad requests, e.g. invalid email address.
      raise CommandException('Received bad request from server: %s' % str(e))
    except AccessDeniedException:
      self._WarnServiceAccounts()
      raise CommandException('Failed to set acl for %s. Please ensure you have '
                             'OWNER-role access to this resource.' % url)

  def _ApplyAclChangesAndReturnChangeCount(self, storage_url, defacl_message):
    modification_count = 0
    for change in self.changes:
      modification_count += change.Execute(storage_url, defacl_message,
                                           'defacl', self.logger)
    return modification_count

  def RunCommand(self):
    """Command entry point for the defacl command."""
    action_subcommand = self.args.pop(0)
    self.ParseSubOpts(check_args=True)
    self.def_acl = True
    self.continue_on_error = False
    if action_subcommand == 'get':
      func = self._GetDefAcl
    elif action_subcommand == 'set':
      func = self._SetDefAcl
    elif action_subcommand in ('ch', 'change'):
      func = self._ChDefAcl
    else:
      raise CommandException(('Invalid subcommand "%s" for the %s command.\n'
                              'See "gsutil help defacl".') %
                             (action_subcommand, self.command_name))
    # Commands with both suboptions and subcommands need to reparse for
    # suboptions, so we log again.
    metrics.LogCommandParams(subcommands=[action_subcommand],
                             sub_opts=self.sub_opts)
    func()
    return 0

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