1 files changed, 49 insertions, 5 deletions
diff --git a/debug_toolbar/models.py b/debug_toolbar/models.py
index d6b18aa..fc78874 100644
--- a/debug_toolbar/models.py
+++ b/debug_toolbar/models.py
@@ -1,21 +1,65 @@
 from __future__ import unicode_literals
 
 from django.conf import settings
+from django.conf.urls import include, patterns, url
+from django.core.urlresolvers import reverse, NoReverseMatch
 from django.utils.importlib import import_module
 
 from debug_toolbar.toolbar.loader import load_panel_classes
 from debug_toolbar.middleware import DebugToolbarMiddleware
 
 
-for middleware_path in settings.MIDDLEWARE_CLASSES:
+def is_toolbar_middleware(middleware_path):
     # Replace this with import_by_path in Django >= 1.6.
     try:
         mod_path, cls_name = middleware_path.rsplit('.', 1)
         mod = import_module(mod_path)
         middleware_cls = getattr(mod, cls_name)
     except (AttributeError, ImportError, ValueError):
-        continue
+        return
+    return issubclass(middleware_cls, DebugToolbarMiddleware)
 
-    if issubclass(middleware_cls, DebugToolbarMiddleware):
-        load_panel_classes()
-        break
+
+def is_toolbar_middleware_installed():
+    return any(is_toolbar_middleware(middleware)
+               for middleware in settings.MIDDLEWARE_CLASSES)
+
+
+def prepend_to_setting(setting_name, value):
+    """Insert value at the beginning of a list or tuple setting."""
+    values = getattr(settings, setting_name)
+    # Make a list [value] or tuple (value,)
+    value = type(values)((value,))
+    setattr(settings, setting_name, value + values)
+
+
+def patch_internal_ips():
+    if not settings.INTERNAL_IPS:
+        prepend_to_setting('INTERNAL_IPS', '127.0.0.1')
+        prepend_to_setting('INTERNAL_IPS', '::1')
+
+
+def patch_middleware_classes():
+    if not is_toolbar_middleware_installed():
+        prepend_to_setting('MIDDLEWARE_CLASSES',
+                           'debug_toolbar.middleware.DebugToolbarMiddleware')
+
+
+def patch_root_urlconf():
+    try:
+        reverse('djdt:render_panel')
+    except NoReverseMatch:
+        urlconf_module = import_module(settings.ROOT_URLCONF)
+        urlconf_module.urlpatterns += patterns('',                      # noqa
+            url(r'^__debug__/', include('debug_toolbar.urls', namespace='djdt', app_name='djdt')),
+        )
+
+
+if settings.DEBUG:
+    patch_internal_ips()
+    patch_middleware_classes()
+    patch_root_urlconf()
+
+
+if is_toolbar_middleware_installed():
+    load_panel_classes()