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"""
Settings for REST framework are all namespaced in the API_SETTINGS setting.
For example your project's `settings.py` file might look like this:
API_SETTINGS = {
'DEFAULT_RENDERERS': (
'djangorestframework.renderers.JSONRenderer',
'djangorestframework.renderers.YAMLRenderer',
)
'DEFAULT_PARSERS': (
'djangorestframework.parsers.JSONParser',
'djangorestframework.parsers.YAMLParser',
)
}
"""
from django.conf import settings
from django.utils import importlib
from djangorestframework.compat import yaml
DEFAULTS = {
'DEFAULT_RENDERERS': (
'djangorestframework.renderers.JSONRenderer',
'djangorestframework.renderers.JSONPRenderer',
'djangorestframework.renderers.DocumentingPlainTextRenderer',
),
'DEFAULT_PARSERS': (
'djangorestframework.parsers.JSONParser',
'djangorestframework.parsers.FormParser'
),
'UNAUTHENTICATED_USER': 'django.contrib.auth.models.AnonymousUser',
'UNAUTHENTICATED_TOKEN': None
}
if yaml:
DEFAULTS['DEFAULT_RENDERERS'] += ('djangorestframework.renderers.YAMLRenderer', )
# List of settings that may be in string import notation.
IMPORT_STRINGS = (
'DEFAULT_RENDERERS',
'UNAUTHENTICATED_USER',
'UNAUTHENTICATED_TOKEN'
)
def perform_import(val, setting):
"""
If the given setting is a string import notation,
then perform the necessary import or imports.
"""
if val is None or setting not in IMPORT_STRINGS:
return val
try:
if isinstance(val, basestring):
return import_from_string(val)
elif isinstance(val, (list, tuple)):
return [import_from_string(item) for item in val]
return val
except:
msg = "Could not import '%s' for API setting '%s'" % (val, setting)
raise ImportError(msg)
def import_from_string(val):
"""
Attempt to import a class from a string representation.
"""
# Nod to tastypie's use of importlib.
parts = val.split('.')
module_path, class_name = '.'.join(parts[:-1]), parts[-1]
module = importlib.import_module(module_path)
return getattr(module, class_name)
class APISettings(object):
"""
A settings object, that allows API settings to be accessed as properties.
For example:
from djangorestframework.settings import api_settings
print api_settings.DEFAULT_RENDERERS
Any setting with string import paths will be resolved.
"""
def __getattr__(self, attr):
if attr not in DEFAULTS.keys():
raise AttributeError("Invalid API setting: '%s'" % attr)
try:
# Check if present in user settings
val = perform_import(settings.API_SETTINGS[attr], attr)
except (AttributeError, KeyError):
# Fall back to defaults
val = perform_import(DEFAULTS[attr], attr)
# Cache the result
setattr(self, attr, val)
return val
api_settings = APISettings()
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