""" Settings for REST framework are all namespaced in the REST_FRAMEWORK setting. For example your project's `settings.py` file might look like this: REST_FRAMEWORK = { 'DEFAULT_RENDERER_CLASSES': [ 'rest_framework.renderers.JSONRenderer', 'rest_framework.renderers.TemplateHTMLRenderer', ], 'DEFAULT_PARSER_CLASSES': [ 'rest_framework.parsers.JSONParser', 'rest_framework.parsers.FormParser', 'rest_framework.parsers.MultiPartParser', ], } This module provides the `api_setting` object, that is used to access REST framework settings, checking for user settings first, then falling back to the defaults. """ from django.conf import settings from django.test.signals import setting_changed from django.utils.module_loading import import_string from rest_framework import ISO_8601 DEFAULTS = { # Base API policies 'DEFAULT_RENDERER_CLASSES': [ 'rest_framework.renderers.JSONRenderer', 'rest_framework.renderers.BrowsableAPIRenderer', ], 'DEFAULT_PARSER_CLASSES': [ 'rest_framework.parsers.JSONParser', 'rest_framework.parsers.FormParser', 'rest_framework.parsers.MultiPartParser' ], 'DEFAULT_AUTHENTICATION_CLASSES': [ 'rest_framework.authentication.SessionAuthentication', 'rest_framework.authentication.BasicAuthentication' ], 'DEFAULT_PERMISSION_CLASSES': [ 'rest_framework.permissions.AllowAny', ], 'DEFAULT_THROTTLE_CLASSES': [], 'DEFAULT_CONTENT_NEGOTIATION_CLASS': 'rest_framework.negotiation.DefaultContentNegotiation', 'DEFAULT_METADATA_CLASS': 'rest_framework.metadata.SimpleMetadata', 'DEFAULT_VERSIONING_CLASS': None, 'DEFAULT_MISSING_DATA': None, # Generic view behavior 'DEFAULT_PAGINATION_CLASS': None, 'DEFAULT_FILTER_BACKENDS': [], # Schema 'DEFAULT_SCHEMA_CLASS': 'rest_framework.schemas.openapi.AutoSchema', # Throttling 'DEFAULT_THROTTLE_RATES': { 'user': None, 'anon': None, }, 'NUM_PROXIES': None, # Pagination 'PAGE_SIZE': None, # Filtering 'SEARCH_PARAM': 'search', 'ORDERING_PARAM': 'ordering', # Versioning 'DEFAULT_VERSION': None, 'ALLOWED_VERSIONS': None, 'VERSION_PARAM': 'version', # Authentication 'UNAUTHENTICATED_USER': 'django.contrib.auth.models.AnonymousUser', 'UNAUTHENTICATED_TOKEN': None, # View configuration 'VIEW_NAME_FUNCTION': 'rest_framework.views.get_view_name', 'VIEW_DESCRIPTION_FUNCTION': 'rest_framework.views.get_view_description', # Exception handling 'EXCEPTION_HANDLER': 'rest_framework.views.exception_handler', 'NON_FIELD_ERRORS_KEY': 'non_field_errors', # Testing 'TEST_REQUEST_RENDERER_CLASSES': [ 'rest_framework.renderers.MultiPartRenderer', 'rest_framework.renderers.JSONRenderer' ], 'TEST_REQUEST_DEFAULT_FORMAT': 'multipart', # Hyperlink settings 'URL_FORMAT_OVERRIDE': 'format', 'FORMAT_SUFFIX_KWARG': 'format', 'URL_FIELD_NAME': 'url', # Input and output formats 'DATE_FORMAT': ISO_8601, 'DATE_INPUT_FORMATS': [ISO_8601], 'DATETIME_FORMAT': ISO_8601, 'DATETIME_INPUT_FORMATS': [ISO_8601], 'TIME_FORMAT': ISO_8601, 'TIME_INPUT_FORMATS': [ISO_8601], # Encoding 'UNICODE_JSON': True, 'COMPACT_JSON': True, 'STRICT_JSON': True, 'COERCE_DECIMAL_TO_STRING': True, 'UPLOADED_FILES_USE_URL': True, # Browseable API 'HTML_SELECT_CUTOFF': 1000, 'HTML_SELECT_CUTOFF_TEXT': "More than {count} items...", # Schemas 'SCHEMA_COERCE_PATH_PK': True, 'SCHEMA_COERCE_METHOD_NAMES': { 'retrieve': 'read', 'destroy': 'delete' }, } # List of settings that may be in string import notation. IMPORT_STRINGS = [ 'DEFAULT_RENDERER_CLASSES', 'DEFAULT_PARSER_CLASSES', 'DEFAULT_AUTHENTICATION_CLASSES', 'DEFAULT_PERMISSION_CLASSES', 'DEFAULT_THROTTLE_CLASSES', 'DEFAULT_CONTENT_NEGOTIATION_CLASS', 'DEFAULT_METADATA_CLASS', 'DEFAULT_VERSIONING_CLASS', 'DEFAULT_PAGINATION_CLASS', 'DEFAULT_FILTER_BACKENDS', 'DEFAULT_SCHEMA_CLASS', 'EXCEPTION_HANDLER', 'TEST_REQUEST_RENDERER_CLASSES', 'UNAUTHENTICATED_USER', 'UNAUTHENTICATED_TOKEN', 'VIEW_NAME_FUNCTION', 'VIEW_DESCRIPTION_FUNCTION' ] # List of settings that have been removed REMOVED_SETTINGS = [ 'PAGINATE_BY', 'PAGINATE_BY_PARAM', 'MAX_PAGINATE_BY', ] def perform_import(val, setting_name): """ If the given setting is a string import notation, then perform the necessary import or imports. """ if val is None: return None elif isinstance(val, str): return import_from_string(val, setting_name) elif isinstance(val, (list, tuple)): return [import_from_string(item, setting_name) for item in val] return val def import_from_string(val, setting_name): """ Attempt to import a class from a string representation. """ try: return import_string(val) except ImportError as e: msg = "Could not import '%s' for API setting '%s'. %s: %s." % (val, setting_name, e.__class__.__name__, e) raise ImportError(msg) class APISettings: """ A settings object that allows REST Framework settings to be accessed as properties. For example: from rest_framework.settings import api_settings print(api_settings.DEFAULT_RENDERER_CLASSES) Any setting with string import paths will be automatically resolved and return the class, rather than the string literal. Note: This is an internal class that is only compatible with settings namespaced under the REST_FRAMEWORK name. It is not intended to be used by 3rd-party apps, and test helpers like `override_settings` may not work as expected. """ def __init__(self, user_settings=None, defaults=None, import_strings=None): if user_settings: self._user_settings = self.__check_user_settings(user_settings) self.defaults = defaults or DEFAULTS self.import_strings = import_strings or IMPORT_STRINGS self._cached_attrs = set() @property def user_settings(self): if not hasattr(self, '_user_settings'): self._user_settings = getattr(settings, 'REST_FRAMEWORK', {}) return self._user_settings def __getattr__(self, attr): if attr not in self.defaults: raise AttributeError("Invalid API setting: '%s'" % attr) try: # Check if present in user settings val = self.user_settings[attr] except KeyError: # Fall back to defaults val = self.defaults[attr] # Coerce import strings into classes if attr in self.import_strings: val = perform_import(val, attr) # Cache the result self._cached_attrs.add(attr) setattr(self, attr, val) return val def __check_user_settings(self, user_settings): SETTINGS_DOC = "https://www.django-rest-framework.org/api-guide/settings/" for setting in REMOVED_SETTINGS: if setting in user_settings: raise RuntimeError("The '%s' setting has been removed. Please refer to '%s' for available settings." % (setting, SETTINGS_DOC)) return user_settings def reload(self): for attr in self._cached_attrs: delattr(self, attr) self._cached_attrs.clear() if hasattr(self, '_user_settings'): delattr(self, '_user_settings') api_settings = APISettings(None, DEFAULTS, IMPORT_STRINGS) def reload_api_settings(*args, **kwargs): setting = kwargs['setting'] if setting == 'REST_FRAMEWORK': api_settings.reload() setting_changed.connect(reload_api_settings)