django-monkey-team

This is a middleware that displays debug tracebacks on production sites (where you would have DEBUG = False) only to developers. Developers have to install a special userscript to decode the traceback data. AES-256 (CBC mode) is used to encrypt the traceback. The decode key and client key are hashes of your SECRET_KEY with salts so your SECRET_KEY is safe even if your userscript gets in the wrong place.

Google Chrome and Firefox are supported. If you want to use something else you have to find a way to install the userscript yourself.

There's also a decode page in the admin in case you get user reports with the encrypted data.

The error page and decrypt flow looks like this:

Installation guide

Install it:

pip install django-monkey-team

Change your Django project settings to have:

INSTALLED_APPS += (
    'monkey_team',
)
MIDDLEWARE_CLASSES += (
    'monkey_team.middleware.MonkeyTeamMiddleware',
)
DEBUG = False

Note, that if you want DEBUG = True and still have the middleware on you need to set:

MONKEY_FORCE_ACTIVE = True

Then go to django admin and install the userscript. The setup page looks like this:

Requirements

OS:	Any
Runtime:	Python 2.6, 2.7
Packages:	PyCrypto, Django>=1.3 (up to 1.6)