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70 lines
2.2 KiB
Python
70 lines
2.2 KiB
Python
"""
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Export Django settings to templates
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https://github.com/jakubroztocil/django-settings-export
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"""
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from django.conf import settings as django_settings
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from django.core.exceptions import ImproperlyConfigured
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__version__ = "1.2.1"
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VARIABLE_NAME = getattr(django_settings, "SETTINGS_EXPORT_VARIABLE_NAME", "settings")
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class SettingsExportError(ImproperlyConfigured):
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"""Base error indicating misconfiguration."""
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class UndefinedSettingError(SettingsExportError):
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"""An undefined setting name included in SETTINGS_EXPORT."""
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class UnexportedSettingError(SettingsExportError):
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"""An unexported setting has been accessed from a template."""
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def settings_export(request):
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"""
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The template context processor that adds settings defined in
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`SETTINGS_EXPORT` to the context. If SETTINGS_EXPORT_VARIABLE_NAME is not
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set, the context variable will be `settings`.
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"""
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variable_name = getattr(
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django_settings, "SETTINGS_EXPORT_VARIABLE_NAME", "settings"
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)
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return {variable_name: _get_exported_settings()}
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class ExportedSettings(dict):
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def __getitem__(self, item):
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"""Fail loudly if accessing a setting that is not exported."""
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try:
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return super(ExportedSettings, self).__getitem__(item)
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except KeyError:
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if hasattr(self, item):
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# Let the KeyError propagate so that Django templates
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# can access the existing attribute (e.g. `items()`).
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raise
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raise UnexportedSettingError(
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"The `{key}` setting key is not accessible"
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' from templates: add "{key}" to'
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" `settings.SETTINGS_EXPORT` to change that.".format(key=item)
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)
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def _get_exported_settings():
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exported_settings = ExportedSettings()
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for key in getattr(django_settings, "SETTINGS_EXPORT", []):
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try:
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value = getattr(django_settings, key)
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except AttributeError:
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raise UndefinedSettingError(
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'"settings.%s" is included in settings.SETTINGS_EXPORT '
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"but it does not exist. " % key
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)
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exported_settings[key] = value
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return exported_settings
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