blog post: Automatically decorating all views of a django project

middleware.py

def process_view(self, request, view_func, view_args, view_kwargs):
    if not hasattr(settings, "VIEW_AUTHENTICATORS"): return None
    mauths = settings.VIEW_AUTHENTICATORS.keys()
    module = view_func.__module__

    # Trying to find if any authenticator is defined for this module
    module_matches = [mauth for mauth in mauths if module.startswith(mauth)]

    # if there is no match, bail out
    if not module_matches: return None

    # if there is a match...
    authenticators = settings.VIEW_AUTHENTICATORS[module_matches[0]]

    functions = []
    # go on parsing the list
    for function_path in authenticators:
        try:
            dot = function_path.rindex('.')
        except ValueError:
            msg = '%s isn\'t a function path (error from '
                  'settings.VIEW_AUTHENTICATORS)' % function_path
            raise exceptions.ImproperlyConfigured, msg

        f_module, f_name = function_path[:dot], function_path[dot+1:]

        try:
            mod = import_module(f_module)
        except ImportError, e:
            msg = 'Error importing module %s '
                  'from settings.VIEW_AUTHENTICATORS: "%s"' % (f_module, e)
            raise exceptions.ImproperlyConfigured, msg
        try:
            f = getattr(mod, f_name)
        except AttributeError:
            msg = 'View authenticator %s is not defined in %s' % (f_module,
                                                                  f_name)
            raise exceptions.ImproperlyConfigured, msg

        functions.append(f)

    def compose(f, g): return lambda *args, **kws: f(g(*args, **kws))
    multi_compose = functools.partial(reduce, compose)
    all_decorators = multi_compose(functions)
    decorated_view = all_decorators(view_func)
    return decorated_view(request, *view_args, **view_kwargs)

settings.py

VIEW_AUTHENTICATORS = {
    "module.views.secret": [
        "django.contrib.auth.decorators.login_required",
        "module.decorators.secret_access_required"],
    "module.views.public": [
        "django.contrib.auth.decorators.login_required",
        "ptms.decorators.public_access_required"]
    }