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from __future__ import absolute_import, unicode_literals
import inspect
from django.apps import AppConfig
from django.conf import settings
from django.core.checks import Error, register
from django.middleware.gzip import GZipMiddleware
from django.utils.module_loading import import_string
from django.utils.translation import ugettext_lazy as _
class DebugToolbarConfig(AppConfig):
name = 'debug_toolbar'
verbose_name = _("Debug Toolbar")
@register
def check_middleware(app_configs, **kwargs):
from debug_toolbar.middleware import DebugToolbarMiddleware
errors = []
gzip_index = None
debug_toolbar_index = None
setting = getattr(settings, 'MIDDLEWARE', None)
setting_name = 'MIDDLEWARE'
if setting is None:
setting = settings.MIDDLEWARE_CLASSES
setting_name = 'MIDDLEWARE_CLASSES'
# Determine the indexes which gzip and/or the toolbar are installed at
for i, middleware in enumerate(setting):
if is_middleware_class(GZipMiddleware, middleware):
gzip_index = i
elif is_middleware_class(DebugToolbarMiddleware, middleware):
debug_toolbar_index = i
if debug_toolbar_index is None:
# If the toolbar does not appear, report an error.
errors.append(
Error(
"debug_toolbar.middleware.DebugToolbarMiddleware is missing "
"from %s." % setting_name,
hint="Add debug_toolbar.middleware.DebugToolbarMiddleware to "
"%s." % setting_name,
)
)
elif gzip_index is not None and debug_toolbar_index < gzip_index:
# If the toolbar appears before the gzip index, report an error.
errors.append(
Error(
"debug_toolbar.middleware.DebugToolbarMiddleware occurs before "
"django.middleware.gzip.GZipMiddleware in %s." % setting_name,
hint="Move debug_toolbar.middleware.DebugToolbarMiddleware to "
"after django.middleware.gzip.GZipMiddleware in %s." % setting_name,
)
)
return errors
def is_middleware_class(middleware_class, middleware_path):
try:
middleware_cls = import_string(middleware_path)
except ImportError:
return
return (
inspect.isclass(middleware_cls) and
issubclass(middleware_cls, middleware_class)
)
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