old_contents: #    Copyright 2014 Rackspace
  #
  #    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.
  
  from oslo_config import cfg
  from oslo_log import log as logging
  from oslo_middleware import cors
  from oslo_middleware import request_id
  import pecan
  
  from octavia.api import config as app_config
  from octavia.common import constants
  from octavia.common import keystone
  from octavia.common import service as octavia_service
  
  LOG = logging.getLogger(__name__)
  
  
  def get_pecan_config():
      """Returns the pecan config."""
      filename = app_config.__file__.replace('.pyc', '.py')
      return pecan.configuration.conf_from_file(filename)
  
  
  def setup_app(pecan_config=None, debug=False, argv=None):
      """Creates and returns a pecan wsgi app."""
      octavia_service.prepare_service(argv)
      cfg.CONF.log_opt_values(LOG, logging.DEBUG)
  
      if not pecan_config:
          pecan_config = get_pecan_config()
      pecan.configuration.set_config(dict(pecan_config), overwrite=True)
  
      return pecan.make_app(
          pecan_config.app.root,
          wrap_app=_wrap_app,
          debug=debug,
          hooks=pecan_config.app.hooks,
          wsme=pecan_config.wsme
      )
  
  
  def _wrap_app(app):
      """Wraps wsgi app with additional middlewares."""
      app = request_id.RequestId(app)
      if cfg.CONF.api_settings.auth_strategy == constants.KEYSTONE:
          app = keystone.SkippingAuthProtocol(app, {})
  
      # This should be the last middleware in the list (which results in
      # it being the first in the middleware chain). This is to ensure
      # that any errors thrown by other middleware, such as an auth
      # middleware - are annotated with CORS headers, and thus accessible
      # by the browser.
      app = cors.CORS(app, cfg.CONF)
      app.set_latent(
          allow_headers=['X-Auth-Token', 'X-Openstack-Request-Id'],
          allow_methods=['GET', 'PUT', 'POST', 'DELETE'],
          expose_headers=['X-Auth-Token', 'X-Openstack-Request-Id']
      )
  
      return app
  
new_contents: #    Copyright 2014 Rackspace
  #
  #    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.
  
  from oslo_config import cfg
  from oslo_log import log as logging
  from oslo_middleware import cors
  from oslo_middleware import request_id
  import pecan
  
  from octavia.api import config as app_config
  from octavia.common import constants
  from octavia.common import keystone
  from octavia.common import service as octavia_service
  
  LOG = logging.getLogger(__name__)
  
  
  def get_pecan_config():
      """Returns the pecan config."""
      filename = app_config.__file__.replace('.pyc', '.py')
      return pecan.configuration.conf_from_file(filename)
  
  
  def setup_app(pecan_config=None, debug=False, argv=None):
      """Creates and returns a pecan wsgi app."""
      octavia_service.prepare_service(argv)
      cfg.CONF.log_opt_values(LOG, logging.DEBUG)
  
      if not pecan_config:
          pecan_config = get_pecan_config()
      pecan.configuration.set_config(dict(pecan_config), overwrite=True)
  
      return pecan.make_app(
          pecan_config.app.root,
          wrap_app=_wrap_app,
          debug=debug,
          hooks=pecan_config.app.hooks,
          wsme=pecan_config.wsme
      )
  
  
  def _wrap_app(app):
      """Wraps wsgi app with additional middlewares."""
      app = request_id.RequestId(app)
      if cfg.CONF.api_settings.auth_strategy == constants.KEYSTONE:
          app = keystone.SkippingAuthProtocol(app, {})
  
      # This should be the last middleware in the list (which results in
      # it being the first in the middleware chain). This is to ensure
      # that any errors thrown by other middleware, such as an auth
      # middleware - are annotated with CORS headers, and thus accessible
      # by the browser.
      app = cors.CORS(app, cfg.CONF)
      cors.set_defaults(
          allow_headers=['X-Auth-Token', 'X-Openstack-Request-Id'],
          allow_methods=['GET', 'PUT', 'POST', 'DELETE'],
          expose_headers=['X-Auth-Token', 'X-Openstack-Request-Id']
      )
  
      return app
  
subject: Stop using deprecated CORS.set_latent()