*(minor): small refactor

passbook/factors/password/signals.py

@@ -0,0 +1,20 @@
+"""passbook password factor signals"""
+from django.dispatch import receiver
+
+from passbook.core.signals import password_changed
+from passbook.factors.password.exceptions import PasswordPolicyInvalid
+
+
+@receiver(password_changed)
+def password_policy_checker(sender, password, **_):
+    """Run password through all password policies which are applied to the user"""
+    from passbook.factors.password.models import PasswordFactor
+    from passbook.policies.engine import PolicyEngine
+    setattr(sender, '__password__', password)
+    _all_factors = PasswordFactor.objects.filter(enabled=True).order_by('order')
+    for factor in _all_factors:
+        policy_engine = PolicyEngine(factor.password_policies.all().select_subclasses())
+        policy_engine.for_user(sender).build()
+        passing, messages = policy_engine.result
+        if not passing:
+            raise PasswordPolicyInvalid(*messages)