Fix for configuring non-default auth plugins properly

Make sure we pick up CONF.auth.methods from configuration
files. Added a test case to make sure the we don't regress

Fixes LP# 1157515

Change-Id: I70290c37b2a5378b5247a14e3bfa20d50bf8fe74

keystone/auth/controllers.py

@@ -277,6 +277,7 @@ class Auth(controller.V3Controller):
     def __init__(self, *args, **kw):
         super(Auth, self).__init__(*args, **kw)
         self.token_controllers_ref = token.controllers.Auth()
+        config.setup_authentication()
 
     def authenticate_for_token(self, context, auth=None):
         """ Authenticate user and issue a token. """

keystone/common/config.py

@@ -124,6 +124,13 @@ def setup_logging(conf):
     root_logger.addHandler(handler)
 
 
+def setup_authentication():
+    # register any non-default auth methods here (used by extensions, etc)
+    for method_name in CONF.auth.methods:
+        if method_name not in _DEFAULT_AUTH_METHODS:
+            register_str(method_name, group="auth")
+
+
 def register_str(*args, **kw):
     conf = kw.pop('conf', CONF)
     group = kw.pop('group', None)

keystone/config.py

@@ -30,3 +30,4 @@ register_bool = config.register_bool
 register_cli_bool = config.register_cli_bool
 register_int = config.register_int
 register_cli_int = config.register_cli_int
+setup_authentication = config.setup_authentication

tests/test_auth.py

@@ -790,3 +790,11 @@ class TokenExpirationTest(AuthTest):
     def test_maintain_uuid_token_expiration(self):
         self.opt_in_group('signing', token_format='UUID')
         self._maintain_token_expiration()
+
+
+class NonDefaultAuthTest(test.TestCase):
+
+    def test_add_non_default_auth_method(self):
+        self.opt_in_group('auth', methods=['password', 'token', 'custom'])
+        config.setup_authentication()
+        self.assertTrue(hasattr(CONF.auth, 'custom'))