Custom username field (#5)

* [#3] Ensure valid json for header field values

* Allow for a different "username" field

We have a project that uses "email" for the username for example.

Author: andrewebdev

auditing/__init__.py

@@ -4,22 +4,27 @@
                                          user_login_failed,
                                          user_logged_out)
 from django.dispatch import receiver
+from django.conf import settings
+
 from . utils import get_request_info
 
+
 logger = logging.getLogger(__name__)
 
+USER_FIELD = getattr(settings, 'AUDIT_USERNAME_FIELD', 'username')
+
 
 @receiver(user_logged_in)
 def login_logger(sender, request, **kwargs):
     _msg = '"Django Login successful", "username": "{}", {}'
-    logger.info(_msg.format(request.POST['username'],
+    logger.info(_msg.format(request.POST[USER_FIELD],
                             get_request_info(request)))
 
 
 @receiver(user_login_failed)
 def login_failed_logger(sender, request, **kwargs):
     _msg = '"Django Login failed", "username": "{}", {}'
-    logger.warn(_msg.format(request.POST['username'],
+    logger.warn(_msg.format(request.POST[USER_FIELD],
                             get_request_info(request)))