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Current File : /proc/3/task/3/cwd/srv/modoboa/env/lib/python3.5/site-packages/rest_framework/settings.py
"""
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,

    # 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 API 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.
    """
    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)

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