Fix default authentication configuration

Add the required authentication backend configuration and include an
example for how to set up the pgauth plugin.

Author: Perdu

django/archives/settings.py

@@ -143,6 +143,9 @@
 SEARCH_CLIENTS = ('127.0.0.1',)
 API_CLIENTS = ('127.0.0.1',)
 PUBLIC_ARCHIVES = False
+# pgauth configuration if using private archives
+PGAUTH_REDIRECT = "http://localhost:8000/account/auth/12/"
+PGAUTH_KEY = "encryption_key"
 ALLOW_RESEND = False
 
 PGWEB_ADDRESS = 'https://www.postgresql.org'
@@ -165,6 +168,10 @@
         'django.contrib.sessions',
     ] + INSTALLED_APPS
 
+    AUTHENTICATION_BACKENDS = (
+        'archives.auth.AuthBackend',
+    )
+
     if not PUBLIC_ARCHIVES:
         from archives.util import validate_new_user
         PGAUTH_CREATEUSER_CALLBACK = validate_new_user