256 lines
9.3 KiB
Python
256 lines
9.3 KiB
Python
"""
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Settings and configuration for Django.
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Read values from the module specified by the DJANGO_SETTINGS_MODULE environment
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variable, and then from django.conf.global_settings; see the global_settings.py
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for a list of all possible variables.
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"""
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import importlib
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import os
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import time
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import traceback
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import warnings
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from pathlib import Path
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import django
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from django.conf import global_settings
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from django.core.exceptions import ImproperlyConfigured
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from django.utils.deprecation import (
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RemovedInDjango30Warning, RemovedInDjango31Warning,
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)
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from django.utils.functional import LazyObject, empty
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ENVIRONMENT_VARIABLE = "DJANGO_SETTINGS_MODULE"
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DEFAULT_CONTENT_TYPE_DEPRECATED_MSG = 'The DEFAULT_CONTENT_TYPE setting is deprecated.'
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FILE_CHARSET_DEPRECATED_MSG = (
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'The FILE_CHARSET setting is deprecated. Starting with Django 3.1, all '
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'files read from disk must be UTF-8 encoded.'
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)
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class SettingsReference(str):
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"""
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String subclass which references a current settings value. It's treated as
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the value in memory but serializes to a settings.NAME attribute reference.
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"""
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def __new__(self, value, setting_name):
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return str.__new__(self, value)
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def __init__(self, value, setting_name):
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self.setting_name = setting_name
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class LazySettings(LazyObject):
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"""
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A lazy proxy for either global Django settings or a custom settings object.
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The user can manually configure settings prior to using them. Otherwise,
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Django uses the settings module pointed to by DJANGO_SETTINGS_MODULE.
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"""
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def _setup(self, name=None):
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"""
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Load the settings module pointed to by the environment variable. This
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is used the first time settings are needed, if the user hasn't
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configured settings manually.
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"""
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settings_module = os.environ.get(ENVIRONMENT_VARIABLE)
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if not settings_module:
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desc = ("setting %s" % name) if name else "settings"
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raise ImproperlyConfigured(
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"Requested %s, but settings are not configured. "
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"You must either define the environment variable %s "
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"or call settings.configure() before accessing settings."
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% (desc, ENVIRONMENT_VARIABLE))
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self._wrapped = Settings(settings_module)
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def __repr__(self):
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# Hardcode the class name as otherwise it yields 'Settings'.
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if self._wrapped is empty:
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return '<LazySettings [Unevaluated]>'
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return '<LazySettings "%(settings_module)s">' % {
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'settings_module': self._wrapped.SETTINGS_MODULE,
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}
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def __getattr__(self, name):
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"""Return the value of a setting and cache it in self.__dict__."""
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if self._wrapped is empty:
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self._setup(name)
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val = getattr(self._wrapped, name)
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self.__dict__[name] = val
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return val
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def __setattr__(self, name, value):
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"""
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Set the value of setting. Clear all cached values if _wrapped changes
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(@override_settings does this) or clear single values when set.
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"""
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if name == '_wrapped':
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self.__dict__.clear()
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else:
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self.__dict__.pop(name, None)
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super().__setattr__(name, value)
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def __delattr__(self, name):
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"""Delete a setting and clear it from cache if needed."""
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super().__delattr__(name)
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self.__dict__.pop(name, None)
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def configure(self, default_settings=global_settings, **options):
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"""
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Called to manually configure the settings. The 'default_settings'
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parameter sets where to retrieve any unspecified values from (its
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argument must support attribute access (__getattr__)).
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"""
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if self._wrapped is not empty:
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raise RuntimeError('Settings already configured.')
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holder = UserSettingsHolder(default_settings)
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for name, value in options.items():
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setattr(holder, name, value)
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self._wrapped = holder
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@property
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def configured(self):
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"""Return True if the settings have already been configured."""
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return self._wrapped is not empty
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@property
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def DEFAULT_CONTENT_TYPE(self):
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stack = traceback.extract_stack()
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# Show a warning if the setting is used outside of Django.
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# Stack index: -1 this line, -2 the caller.
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filename, _line_number, _function_name, _text = stack[-2]
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if not filename.startswith(os.path.dirname(django.__file__)):
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warnings.warn(
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DEFAULT_CONTENT_TYPE_DEPRECATED_MSG,
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RemovedInDjango30Warning,
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stacklevel=2,
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)
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return self.__getattr__('DEFAULT_CONTENT_TYPE')
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@property
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def FILE_CHARSET(self):
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stack = traceback.extract_stack()
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# Show a warning if the setting is used outside of Django.
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# Stack index: -1 this line, -2 the caller.
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filename, _line_number, _function_name, _text = stack[-2]
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if not filename.startswith(os.path.dirname(django.__file__)):
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warnings.warn(
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FILE_CHARSET_DEPRECATED_MSG,
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RemovedInDjango31Warning,
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stacklevel=2,
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)
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return self.__getattr__('FILE_CHARSET')
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class Settings:
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def __init__(self, settings_module):
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# update this dict from global settings (but only for ALL_CAPS settings)
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for setting in dir(global_settings):
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if setting.isupper():
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setattr(self, setting, getattr(global_settings, setting))
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# store the settings module in case someone later cares
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self.SETTINGS_MODULE = settings_module
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mod = importlib.import_module(self.SETTINGS_MODULE)
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tuple_settings = (
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"INSTALLED_APPS",
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"TEMPLATE_DIRS",
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"LOCALE_PATHS",
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)
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self._explicit_settings = set()
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for setting in dir(mod):
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if setting.isupper():
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setting_value = getattr(mod, setting)
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if (setting in tuple_settings and
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not isinstance(setting_value, (list, tuple))):
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raise ImproperlyConfigured("The %s setting must be a list or a tuple. " % setting)
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setattr(self, setting, setting_value)
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self._explicit_settings.add(setting)
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if not self.SECRET_KEY:
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raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")
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if self.is_overridden('DEFAULT_CONTENT_TYPE'):
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warnings.warn(DEFAULT_CONTENT_TYPE_DEPRECATED_MSG, RemovedInDjango30Warning)
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if self.is_overridden('FILE_CHARSET'):
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warnings.warn(FILE_CHARSET_DEPRECATED_MSG, RemovedInDjango31Warning)
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if hasattr(time, 'tzset') and self.TIME_ZONE:
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# When we can, attempt to validate the timezone. If we can't find
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# this file, no check happens and it's harmless.
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zoneinfo_root = Path('/usr/share/zoneinfo')
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zone_info_file = zoneinfo_root.joinpath(*self.TIME_ZONE.split('/'))
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if zoneinfo_root.exists() and not zone_info_file.exists():
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raise ValueError("Incorrect timezone setting: %s" % self.TIME_ZONE)
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# Move the time zone info into os.environ. See ticket #2315 for why
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# we don't do this unconditionally (breaks Windows).
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os.environ['TZ'] = self.TIME_ZONE
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time.tzset()
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def is_overridden(self, setting):
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return setting in self._explicit_settings
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def __repr__(self):
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return '<%(cls)s "%(settings_module)s">' % {
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'cls': self.__class__.__name__,
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'settings_module': self.SETTINGS_MODULE,
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}
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class UserSettingsHolder:
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"""Holder for user configured settings."""
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# SETTINGS_MODULE doesn't make much sense in the manually configured
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# (standalone) case.
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SETTINGS_MODULE = None
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def __init__(self, default_settings):
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"""
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Requests for configuration variables not in this class are satisfied
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from the module specified in default_settings (if possible).
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"""
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self.__dict__['_deleted'] = set()
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self.default_settings = default_settings
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def __getattr__(self, name):
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if name in self._deleted:
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raise AttributeError
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return getattr(self.default_settings, name)
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def __setattr__(self, name, value):
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self._deleted.discard(name)
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if name == 'DEFAULT_CONTENT_TYPE':
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warnings.warn(DEFAULT_CONTENT_TYPE_DEPRECATED_MSG, RemovedInDjango30Warning)
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elif name == 'FILE_CHARSET':
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warnings.warn(FILE_CHARSET_DEPRECATED_MSG, RemovedInDjango31Warning)
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super().__setattr__(name, value)
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def __delattr__(self, name):
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self._deleted.add(name)
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if hasattr(self, name):
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super().__delattr__(name)
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def __dir__(self):
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return sorted(
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s for s in [*self.__dict__, *dir(self.default_settings)]
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if s not in self._deleted
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)
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def is_overridden(self, setting):
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deleted = (setting in self._deleted)
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set_locally = (setting in self.__dict__)
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set_on_default = getattr(self.default_settings, 'is_overridden', lambda s: False)(setting)
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return deleted or set_locally or set_on_default
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def __repr__(self):
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return '<%(cls)s>' % {
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'cls': self.__class__.__name__,
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}
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settings = LazySettings()
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