text: """
  Django settings for app project.
  
  For more information on this file, see
  https://docs.djangoproject.com/en/2.0/topics/settings/
  
  For the full list of settings and their values, see
  https://docs.djangoproject.com/en/2.0/ref/settings/
  
  Any setting that is configured via an environment variable may
  also be set in a `.env` file in the project base directory.
  """
  import importlib.util
  import sys
  from os import path
  
  import dj_database_url
  from environs import Env, EnvError
  from furl import furl
  
  
  # Build paths inside the project like this: path.join(BASE_DIR, ...)
  BASE_DIR = path.dirname(path.dirname(path.abspath(__file__)))
  
  env = Env()
  env.read_env(path.join(BASE_DIR, '.env'), recurse=False)
  
  
  # Quick-start development settings - unsuitable for production
  # See https://docs.djangoproject.com/en/2.0/howto/deployment/checklist/
  
  # SECURITY WARNING: keep the secret key used in production secret!
  SECRET_KEY = env('SECRET_KEY',
                   'v8sk33sy82!uw3ty=!jjv5vp7=s2phrzw(m(hrn^f7e_#1h2al')
  
  # SECURITY WARNING: don't run with debug turned on in production!
  DEBUG = env.bool('DEBUG', True)
  
  # True if you want to allow users to be able to create an account
  ALLOW_SIGNUP = env.bool('ALLOW_SIGNUP', True)
  
  
  # Application definition
  
  INSTALLED_APPS = [
      'whitenoise.runserver_nostatic',
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'api.apps.ApiConfig',
      'rest_framework',
      'rest_framework.authtoken',
      'django_filters',
      'social_django',
      'polymorphic',
      'corsheaders',
      'authentification',
      'drf_yasg',
      'dj_rest_auth',
      'django_celery_results',
      'django_drf_filepond'
  ]
  
  CLOUD_BROWSER_APACHE_LIBCLOUD_PROVIDER = env('CLOUD_BROWSER_LIBCLOUD_PROVIDER', None)
  CLOUD_BROWSER_APACHE_LIBCLOUD_ACCOUNT = env('CLOUD_BROWSER_LIBCLOUD_ACCOUNT', None)
  CLOUD_BROWSER_APACHE_LIBCLOUD_SECRET_KEY = env('CLOUD_BROWSER_LIBCLOUD_KEY', None)
  
  if CLOUD_BROWSER_APACHE_LIBCLOUD_PROVIDER:
      CLOUD_BROWSER_DATASTORE = 'ApacheLibcloud'
      CLOUD_BROWSER_OBJECT_REDIRECT_URL = '/v1/cloud-upload'
      INSTALLED_APPS.append('cloud_browser')
  
  MIDDLEWARE = [
      'django.middleware.security.SecurityMiddleware',
      'whitenoise.middleware.WhiteNoiseMiddleware',
      'django.contrib.sessions.middleware.SessionMiddleware',
      'django.middleware.common.CommonMiddleware',
      'django.middleware.csrf.CsrfViewMiddleware',
      'django.contrib.auth.middleware.AuthenticationMiddleware',
      'django.contrib.messages.middleware.MessageMiddleware',
      'django.middleware.clickjacking.XFrameOptionsMiddleware',
      'social_django.middleware.SocialAuthExceptionMiddleware',
      # 'applicationinsights.django.ApplicationInsightsMiddleware',
      'corsheaders.middleware.CorsMiddleware',
  ]
  
  ROOT_URLCONF = 'app.urls'
  
  TEMPLATES = [
      {
          'BACKEND': 'django.template.backends.django.DjangoTemplates',
          'DIRS': [path.join(BASE_DIR, 'client/dist')],
          'APP_DIRS': True,
          'OPTIONS': {
              'context_processors': [
                  'django.template.context_processors.debug',
                  'django.template.context_processors.request',
                  'django.contrib.auth.context_processors.auth',
                  'django.contrib.messages.context_processors.messages',
                  'social_django.context_processors.backends',
                  'social_django.context_processors.login_redirect',
              ],
              # 'libraries': {
              #     'analytics': 'server.templatetags.analytics',
              #     'utils_templating': 'authentification.templatetags.utils_templating',
              # },
          },
      },
  ]
  
  # Static files (CSS, JavaScript, Images)
  # https://docs.djangoproject.com/en/2.0/howto/static-files/
  
  STATIC_URL = '/static/'
  STATIC_ROOT = path.join(BASE_DIR, 'staticfiles')
  
  STATICFILES_DIRS = [
      path.join(BASE_DIR, 'client/dist/static'),
  ]
  
  STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'
  
  WSGI_APPLICATION = 'app.wsgi.application'
  
  AUTHENTICATION_BACKENDS = [
      'social_core.backends.github.GithubOAuth2',
      'social_core.backends.azuread_tenant.AzureADTenantOAuth2',
      'social_core.backends.okta.OktaOAuth2',
      'social_core.backends.okta_openidconnect.OktaOpenIdConnect',
      'django.contrib.auth.backends.ModelBackend',
  ]
  
  HEADER_AUTH_USER_NAME = env('HEADER_AUTH_USER_NAME', '')
  HEADER_AUTH_USER_GROUPS = env('HEADER_AUTH_USER_GROUPS', '')
  HEADER_AUTH_ADMIN_GROUP_NAME = env('HEADER_AUTH_ADMIN_GROUP_NAME', '')
  HEADER_AUTH_GROUPS_SEPERATOR = env('HEADER_AUTH_GROUPS_SEPERATOR', default=',')
  
  if HEADER_AUTH_USER_NAME and HEADER_AUTH_USER_GROUPS and HEADER_AUTH_ADMIN_GROUP_NAME:
      MIDDLEWARE.append('server.middleware.HeaderAuthMiddleware')
      AUTHENTICATION_BACKENDS.append('django.contrib.auth.backends.RemoteUserBackend')
  
  SOCIAL_AUTH_GITHUB_KEY = env('OAUTH_GITHUB_KEY', None)
  SOCIAL_AUTH_GITHUB_SECRET = env('OAUTH_GITHUB_SECRET', None)
  GITHUB_ADMIN_ORG_NAME = env('GITHUB_ADMIN_ORG_NAME', None)
  GITHUB_ADMIN_TEAM_NAME = env('GITHUB_ADMIN_TEAM_NAME', None)
  
  if GITHUB_ADMIN_ORG_NAME and GITHUB_ADMIN_TEAM_NAME:
      SOCIAL_AUTH_GITHUB_SCOPE = ['read:org']
  
  SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_KEY = env('OAUTH_AAD_KEY', None)
  SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_SECRET = env('OAUTH_AAD_SECRET', None)
  SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_TENANT_ID = env('OAUTH_AAD_TENANT', None)
  AZUREAD_ADMIN_GROUP_ID = env('AZUREAD_ADMIN_GROUP_ID', None)
  
  if AZUREAD_ADMIN_GROUP_ID:
      SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_RESOURCE = 'https://graph.microsoft.com/'
      SOCIAL_AUTH_AZUREAD_TENANT_OAUTH2_SCOPE = ['Directory.Read.All']
  
  SOCIAL_AUTH_OKTA_OAUTH2_KEY = env('OAUTH_OKTA_OAUTH2_KEY', None)
  SOCIAL_AUTH_OKTA_OAUTH2_SECRET = env('OAUTH_OKTA_OAUTH2_SECRET', None)
  SOCIAL_AUTH_OKTA_OAUTH2_API_URL = env('OAUTH_OKTA_OAUTH2_API_URL', None)
  OKTA_OAUTH2_ADMIN_GROUP_NAME = env('OKTA_OAUTH2_ADMIN_GROUP_NAME', None)
  
  if SOCIAL_AUTH_OKTA_OAUTH2_API_URL:
      SOCIAL_AUTH_OKTA_OAUTH2_SCOPE = ["groups"]
  
  SOCIAL_AUTH_OKTA_OPENIDCONNECT_KEY = env('OAUTH_OKTA_OPENIDCONNECT_KEY', None)
  SOCIAL_AUTH_OKTA_OPENIDCONNECT_SECRET = env('OAUTH_OKTA_OPENIDCONNECT_SECRET', None)
  SOCIAL_AUTH_OKTA_OPENIDCONNECT_API_URL = env('OAUTH_OKTA_OPENIDCONNECT_API_URL', None)
  OKTA_OPENIDCONNECT_ADMIN_GROUP_NAME = env('OKTA_OPENIDCONNECT_ADMIN_GROUP_NAME', None)
  
  if SOCIAL_AUTH_OKTA_OPENIDCONNECT_API_URL:
      SOCIAL_AUTH_OKTA_OPENIDCONNECT_SCOPE = ["groups"]
  
  SOCIAL_AUTH_PIPELINE = [
      'social_core.pipeline.social_auth.social_details',
      'social_core.pipeline.social_auth.social_uid',
      'social_core.pipeline.social_auth.auth_allowed',
      'social_core.pipeline.social_auth.social_user',
      'social_core.pipeline.user.get_username',
      'social_core.pipeline.user.create_user',
      'social_core.pipeline.social_auth.associate_user',
      'social_core.pipeline.social_auth.load_extra_data',
      'social_core.pipeline.user.user_details',
      'server.social_auth.fetch_github_permissions',
      'server.social_auth.fetch_azuread_permissions',
      'server.social_auth.fetch_okta_oauth2_permissions',
      'server.social_auth.fetch_okta_openidconnect_permissions',
  ]
  
  ROLE_PROJECT_ADMIN = env('ROLE_PROJECT_ADMIN', 'project_admin')
  ROLE_ANNOTATOR = env('ROLE_ANNOTATOR', 'annotator')
  ROLE_ANNOTATION_APPROVER = env('ROLE_ANNOTATION_APPROVER', 'annotation_approver')
  
  # Database
  # https://docs.djangoproject.com/en/2.0/ref/settings/#databases
  
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.sqlite3',
          'NAME': path.join(BASE_DIR, 'db.sqlite3'),
      }
  }
  
  
  # Password validation
  # https://docs.djangoproject.com/en/2.0/ref/settings/#auth-password-validators
  
  AUTH_PASSWORD_VALIDATORS = [
      {
          'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
      },
      {
          'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
      },
      {
          'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
      },
      {
          'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
      },
  ]
  
  REST_FRAMEWORK = {
      # Use Django's standard `django.contrib.auth` permissions,
      # or allow read-only access for unauthenticated users.
      'DEFAULT_PERMISSION_CLASSES': [
          'rest_framework.permissions.DjangoModelPermissionsOrAnonReadOnly',
          'rest_framework.permissions.IsAuthenticated',
      ],
      'DEFAULT_AUTHENTICATION_CLASSES': (
          'rest_framework.authentication.SessionAuthentication',
          'rest_framework.authentication.TokenAuthentication',
      ),
      'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.LimitOffsetPagination',
      'PAGE_SIZE': env.int('DOCCANO_PAGE_SIZE', default=5),
      'DEFAULT_FILTER_BACKENDS': ('django_filters.rest_framework.DjangoFilterBackend',),
      'SEARCH_PARAM': 'q',
      'DEFAULT_RENDERER_CLASSES': (
          'rest_framework.renderers.JSONRenderer',
          'rest_framework.renderers.BrowsableAPIRenderer',
          'rest_framework_xml.renderers.XMLRenderer'
      )
  }
  
  # Internationalization
  # https://docs.djangoproject.com/en/2.0/topics/i18n/
  
  LANGUAGE_CODE = 'tr'
  
  TIME_ZONE = 'UTC'
  
  USE_I18N = True
  
  USE_L10N = True
  
  USE_TZ = True
  
  TEST_RUNNER = 'xmlrunner.extra.djangotestrunner.XMLTestRunner'
  TEST_OUTPUT_DIR = path.join(BASE_DIR, 'junitxml')
  
  LOGIN_URL = '/login/'
  LOGIN_REDIRECT_URL = '/projects/'
  LOGOUT_REDIRECT_URL = '/'
  
  # dynamic import to avoid installing psycopg2 on pip installation.
  name = 'django_heroku'
  spec = importlib.util.find_spec(name)
  if spec is not None:
      module = importlib.util.module_from_spec(spec)
      sys.modules[name] = module
      spec.loader.exec_module(module)
      module.settings(locals(), test_runner=False)
  
  # Change 'default' database configuration with $DATABASE_URL.
  DATABASES['default'].update(dj_database_url.config(
      env='DATABASE_URL',
      conn_max_age=env.int('DATABASE_CONN_MAX_AGE', 500),
      ssl_require='sslmode' not in furl(env('DATABASE_URL', '')).args,
  ))
  
  # work-around for dj-database-url: explicitly disable ssl for sqlite
  if DATABASES['default'].get('ENGINE') == 'django.db.backends.sqlite3':
      DATABASES['default'].get('OPTIONS', {}).pop('sslmode', None)
  
  # work-around for dj-database-url: patch ssl for mysql
  if DATABASES['default'].get('ENGINE') == 'django.db.backends.mysql':
      DATABASES['default'].get('OPTIONS', {}).pop('sslmode', None)
      if env('MYSQL_SSL_CA', None):
          DATABASES['default'].setdefault('OPTIONS', {})\
              .setdefault('ssl', {}).setdefault('ca', env('MYSQL_SSL_CA', None))
  
  # default to a sensible modern driver for Azure SQL
  if DATABASES['default'].get('ENGINE') == 'sql_server.pyodbc':
      DATABASES['default'].setdefault('OPTIONS', {})\
          .setdefault('driver', 'ODBC Driver 17 for SQL Server')
  
  # Honor the 'X-Forwarded-Proto' header for request.is_secure()
  SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
  SESSION_COOKIE_SECURE = env.bool('SESSION_COOKIE_SECURE', False)
  CSRF_COOKIE_SECURE = env.bool('CSRF_COOKIE_SECURE', False)
  CSRF_TRUSTED_ORIGINS = env.list('CSRF_TRUSTED_ORIGINS', [])
  
  # Allow all host headers
  ALLOWED_HOSTS = ['*']
  
  # Size of the batch for creating documents
  # on the import phase
  IMPORT_BATCH_SIZE = env.int('IMPORT_BATCH_SIZE', 1000)
  
  GOOGLE_TRACKING_ID = env('GOOGLE_TRACKING_ID', 'UA-125643874-2').strip()
  
  AZURE_APPINSIGHTS_IKEY = env('AZURE_APPINSIGHTS_IKEY', None)
  APPLICATION_INSIGHTS = {
      'ikey': AZURE_APPINSIGHTS_IKEY if AZURE_APPINSIGHTS_IKEY else None,
      'endpoint': env('AZURE_APPINSIGHTS_ENDPOINT', None),
  }
  
  # necessary for email verification of new accounts
  EMAIL_USE_TLS = env.bool('EMAIL_USE_TLS', False)
  EMAIL_HOST = env('EMAIL_HOST', None)
  EMAIL_HOST_USER = env('EMAIL_HOST_USER', None)
  EMAIL_HOST_PASSWORD = env('EMAIL_HOST_PASSWORD', None)
  EMAIL_PORT = env.int('EMAIL_PORT', 587)
  DEFAULT_FROM_EMAIL = env('DEFAULT_FROM_EMAIL', 'webmaster@localhost')
  
  if not EMAIL_HOST:
      EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
  
  
  if DEBUG:
      CORS_ORIGIN_WHITELIST = (
          'http://127.0.0.1:3000',
          'http://0.0.0.0:3000',
          'http://localhost:3000'
      )
  
  MEDIA_ROOT = path.join(BASE_DIR, 'media')
  MEDIA_URL = '/media/'
  
  # Filepond settings.
  DJANGO_DRF_FILEPOND_UPLOAD_TMP = path.join(BASE_DIR, 'filepond-temp-uploads')
  DJANGO_DRF_FILEPOND_FILE_STORE_PATH = MEDIA_ROOT
  
  # Celery settings
  DJANGO_CELERY_RESULTS_TASK_ID_MAX_LENGTH = 191
  CELERY_RESULT_BACKEND = 'django-db'
  try:
      CELERY_BROKER_URL = env('CELERY_BROKER_URL')
  except EnvError:
      try:
          # quickfix for Heroku.
          # See https://github.com/doccano/doccano/issues/1327.
          uri = env('DATABASE_URL')
          if uri.startswith('postgres://'):
              uri = uri.replace('postgres://', 'postgresql://', 1)
          CELERY_BROKER_URL = 'sqla+{}'.format(uri)
      except EnvError:
          CELERY_BROKER_URL = 'sqla+sqlite:///{}'.format(DATABASES['default']['NAME'])
  CELERY_ACCEPT_CONTENT = ['application/json']
  CELERY_TASK_SERIALIZER = 'json'
  CELERY_RESULT_SERIALIZER = 'json'
  
  DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'
  