Add messages and signals

Add "Password is expired" message.
Add `password_expired` signal.
Update signals documentation.

account/middleware.py

@@ -1,9 +1,11 @@
 from __future__ import unicode_literals
 
+from django.contrib import messages
 from django.core.urlresolvers import resolve
 from django.shortcuts import redirect
 from django.utils import translation, timezone
 from django.utils.cache import patch_vary_headers
+from django.utils.translation import ugettext_lazy as _
 
 from account.conf import settings
 from account.models import Account
@@ -64,6 +66,11 @@ def process_request(self, request):
             # All users must be allowed to access "change password" url.
             if url_name not in settings.ACCOUNT_PASSWORD_CHANGE_REDIRECT_URL:
                 if check_password_expired(request.user):
+                    messages.add_message(
+                        request,
+                        messages.WARNING,
+                        _("Password is expired.")
+                    )
                     return redirect(
                         settings.ACCOUNT_PASSWORD_CHANGE_REDIRECT_URL
                     )

account/signals.py

@@ -12,3 +12,4 @@
 email_confirmed = django.dispatch.Signal(providing_args=["email_address"])
 email_confirmation_sent = django.dispatch.Signal(providing_args=["confirmation"])
 password_changed = django.dispatch.Signal(providing_args=["user"])
+password_expired = django.dispatch.Signal(providing_args=["user"])

docs/signals.rst

@@ -66,4 +66,11 @@ password_changed
 ----------------
 
 Triggered when a user changes his password. Providing argument ``user``
+(User instance).
+
+
+password_expired
+----------------
+
+Triggered when a user password is expired. Providing argument ``user``
 (User instance).