class RequireLoginMiddleware(object):
    """
    Middleware component that wraps the login_required decorator around
    matching URL patterns. To use, add the class to MIDDLEWARE_CLASSES and
    define LOGIN_REQUIRED_URLS and LOGIN_REQUIRED_URLS_EXCEPTIONS in your
    settings.py. For example:
    ------
    LOGIN_REQUIRED_URLS = (
        r'/topsecret/(.*)$',
    )
    LOGIN_REQUIRED_URLS_EXCEPTIONS = (
        r'/topsecret/login(.*)$',
        r'/topsecret/logout(.*)$',
    )
    ------
    LOGIN_REQUIRED_URLS is where you define URL patterns; each pattern must
    be a valid regex.

    LOGIN_REQUIRED_URLS_EXCEPTIONS is, conversely, where you explicitly
    define any exceptions (like login and logout URLs).
    """
    def __init__(self):
        self.required = tuple([re.compile(url) for url in settings.LOGIN_REQUIRED_URLS])
        self.exceptions = tuple([re.compile(url) for url in
                                 settings.LOGIN_REQUIRED_URLS_EXCEPTIONS])

    def process_view(self, request, view_func, view_args, view_kwargs):
        # No need to process URLs if user already logged in
        if request.user.is_authenticated():
            return None
        # An exception match should immediately return None
        for url in self.exceptions:
            if url.match(request.path):
                return None
            # Requests matching a restricted URL pattern are returned
        # wrapped with the login_required decorator
        for url in self.required:
            if url.match(request.path):
                return login_required(view_func)(request, *view_args, **view_kwargs)
            # Explicitly return None for all non-matching requests
        return None



# LoginRequiredMiddleware
LOGIN_REQUIRED_URLS = (
    r'^/(.*)$',

)
LOGIN_REQUIRED_URLS_EXCEPTIONS = (
    r'^/admin/(.*)$',
    r'^/accounts/login/$',
    r'^/accounts/logout/$',
    # r'^/accounts/password_reset/$',
    # r'^/accounts/password_reset/done/$',
    # r'^/accounts/reset/.*/$',
)
LOGIN_REDIRECT_URL = '/'