text: # Copyright (C) 2010-2012 Yaco Sistemas (http://www.yaco.es)
  # Copyright (C) 2009 Lorenzo Gil Sanchez <lorenzo.gil.sanchez@gmail.com>
  #
  # 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.
  
  import copy
  
  from django.conf import settings
  from django.core.exceptions import ImproperlyConfigured
  try:
      from importlib import import_module
  except ImportError:
      from django.utils.importlib import import_module
  
  from saml2.config import SPConfig
  
  from djangosaml2.utils import get_custom_setting
  
  
  def get_config_loader(path, request=None):
      i = path.rfind('.')
      module, attr = path[:i], path[i + 1:]
      try:
          mod = import_module(module)
      except ImportError, e:
          raise ImproperlyConfigured(
              'Error importing SAML config loader %s: "%s"' % (path, e))
      except ValueError, e:
          raise ImproperlyConfigured(
              'Error importing SAML config loader. Is SAML_CONFIG_LOADER '
              'a correctly string with a callable path?'
              )
      try:
          config_loader = getattr(mod, attr)
      except AttributeError:
          raise ImproperlyConfigured(
              'Module "%s" does not define a "%s" config loader' %
              (module, attr)
              )
  
      if not hasattr(config_loader, '__call__'):
          raise ImproperlyConfigured(
              "SAML config loader must be a callable object.")
  
      return config_loader
  
  
  def config_settings_loader(request=None):
      """Utility function to load the pysaml2 configuration.
  
      This is also the default config loader.
      """
      conf = SPConfig()
      conf.load(copy.deepcopy(settings.SAML_CONFIG))
      return conf
  
  
  def get_config(config_loader_path=None, request=None):
      config_loader_path = config_loader_path or get_custom_setting(
          'SAML_CONFIG_LOADER', 'djangosaml2.conf.config_settings_loader')
  
      config_loader = get_config_loader(config_loader_path)
      return config_loader(request)
  