Implement session-based and OAuth 2 authentications

Relates #21. Please see acceptance docs for feature details.

Signed-off-by: Aaron Tan <jangsutsr@gmail.com>

awx/api/conf.py

@@ -1,8 +1,9 @@
 # Django
 from django.utils.translation import ugettext_lazy as _
 
-# Tower
+# AWX
 from awx.conf import fields, register
+from awx.api.fields import OAuth2ProviderField
 
 
 register(
@@ -24,7 +25,24 @@ register(
     category=_('Authentication'),
     category_slug='authentication',
 )
-
+register(
+    'SESSION_COOKIE_AGE',
+    field_class=fields.IntegerField,
+    min_value=60,
+    label=_('Idle Time Force Log Out'),
+    help_text=_('Number of seconds that a user is inactive before they will need to login again.'),
+    category=_('Authentication'),
+    category_slug='authentication',
+)
+register(
+    'SESSIONS_PER_USER',
+    field_class=fields.IntegerField,
+    min_value=-1,
+    label=_('Maximum number of simultaneous logged in sessions'),
+    help_text=_('Maximum number of simultaneous logged in sessions a user may have. To disable enter -1.'),
+    category=_('Authentication'),
+    category_slug='authentication',
+)
 register(
     'AUTH_BASIC_ENABLED',
     field_class=fields.BooleanField,
@@ -33,3 +51,15 @@ register(
     category=_('Authentication'),
     category_slug='authentication',
 )
+register(
+    'OAUTH2_PROVIDER',
+    field_class=OAuth2ProviderField,
+    default={'ACCESS_TOKEN_EXPIRE_SECONDS': 36000, 'AUTHORIZATION_CODE_EXPIRE_SECONDS': 60},
+    label=_('OAuth 2 Timeout Settings'),
+    help_text=_('Dictionary for customizing OAuth 2 timeouts, available items are '
+                '`ACCESS_TOKEN_EXPIRE_SECONDS`, the duration of access tokens in the number '
+                'of seconds, and `AUTHORIZATION_CODE_EXPIRE_SECONDS`, the duration of '
+                'authorization grants in the number of seconds.'),
+    category=_('Authentication'),
+    category_slug='authentication',
+)