Store special data on failed authentication

Question

I write simple Django project and I want to store client IP and date whenever a login attempt fails. I prepare model:

class FailIp(models.Model):

    ip = models.CharField(
        max_length=16,
        verbose_name=_(u'fail login ip'),
    )
    date = models.DateTimeField(default=datetime.now)

But I do not know how to hook up to the login error. Urls:

url(
    r'^login/$',
    'django.contrib.auth.views.login', {
        'template_name': 'login.html'
    },
    name='login'
),

How to do it?

Answer 1

This is a very good use case for django.contrib.auth.signals.user_login_failed signal - was introduced in Django 1.5, it is sent when the user failed to login successfully:

from django.contrib.auth import signals

def listener_login_failed(sender, credentials, **kwargs):
    # handle log in failure

signals.user_login_failed.connect(listener_login_failed)

Also see tests for django.contrib.auth.signals.