text: # -*- coding: utf-8 -*-
  #
  # Copyright 2013 - Mirantis, Inc.
  #
  #    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
  import oslo_middleware.cors as cors_middleware
  import pecan
  
  from mistral.api import access_control
  from mistral import context as ctx
  from mistral import coordination
  from mistral.db.v2 import api as db_api_v2
  from mistral.services import periodic
  
  
  def get_pecan_config():
      # Set up the pecan configuration.
      opts = cfg.CONF.pecan
  
      cfg_dict = {
          "app": {
              "root": opts.root,
              "modules": opts.modules,
              "debug": opts.debug,
              "auth_enable": opts.auth_enable
          }
      }
  
      return pecan.configuration.conf_from_dict(cfg_dict)
  
  
  def setup_app(config=None):
      if not config:
          config = get_pecan_config()
  
      app_conf = dict(config.app)
  
      db_api_v2.setup_db()
  
      periodic.setup()
  
      coordination.Service('api_group').register_membership()
  
      app = pecan.make_app(
          app_conf.pop('root'),
          hooks=lambda: [ctx.ContextHook(), ctx.AuthHook()],
          logging=getattr(config, 'logging', {}),
          **app_conf
      )
  
      # Set up access control.
      app = access_control.setup(app)
  
      # Create a CORS wrapper, and attach mistral-specific defaults that must be
      # included in all CORS responses.
      app = cors_middleware.CORS(app, cfg.CONF)
      app.set_latent(
          allow_headers=['X-Auth-Token', 'X-Identity-Status', 'X-Roles',
                         'X-Service-Catalog', 'X-User-Id', 'X-Tenant-Id'
                         'X-Project-Id', 'X-User-Name', 'X-Project-Name'],
          allow_methods=['GET', 'PUT', 'POST', 'DELETE', 'PATCH'],
          expose_headers=['X-Auth-Token', 'X-Subject-Token',
                          'X-Service-Token', 'X-Project-Id', 'X-User-Name',
                          'X-Project-Name']
      )
  
      return app
  