Do not special case *any* authenticator

No two ways to set authenticator options - just one way.
It's slightly 'ugly' because of the mixing of camel case &
snake case, but is worth the massive reductions in complexity!

tests/test_configurer.py

@@ -101,8 +101,8 @@ def test_auth_dummy():
     """
     c = apply_mock_config({
         'auth': {
-            'type': 'dummy',
-            'dummy': {
+            'type': 'dummyauthenticator.DummyAuthenticator',
+            'DummyAuthenticator': {
                 'password': 'test'
             }
         }
@@ -117,8 +117,8 @@ def test_auth_firstuse():
     """
     c = apply_mock_config({
         'auth': {
-            'type': 'firstuse',
-            'firstuse': {
+            'type': 'firstuseauthenticator.FirstUseAuthenticator',
+            'FirstUseAuthenticator': {
                 'create_users': True
             }
         }
@@ -129,7 +129,7 @@ def test_auth_firstuse():
 
 def test_auth_github():
     """
-    Test using GitHub authenticator, which is not explicitly special cased.
+    Test using GitHub authenticator
     """
     c = apply_mock_config({
         'auth': {

tljh/configurer.py

@@ -11,9 +11,8 @@ FIXME: A strong feeling that JSON Schema should be involved somehow.
 # User provided config is merged into this
 default = {
     'auth': {
-        'type': 'firstuse',
-        'dummy': {},
-        'firstuse': {
+        'type': 'firstuseauthenticator.FirstUseAuthenticator',
+        'FirstUseAuthenticator': {
             'create_users': False
         }
     },
@@ -64,16 +63,6 @@ def update_auth(c, config):
     """
     auth = config.get('auth')
 
-    # Map value of 'auth.type' in config to a fully qualified name
-    authenticator_class_map = {
-        'dummy': 'dummyauthenticator.DummyAuthenticator',
-        'firstuse': 'firstuseauthenticator.FirstUseAuthenticator'
-    }
-
-    if auth['type'] in authenticator_class_map:
-        authenticator_class = authenticator_class_map[auth['type']]
-        authenticator_configname = auth['type']
-    else:
     # FIXME: Make sure this is something importable.
     # FIXME: SECURITY: Class must inherit from Authenticator, to prevent us being
     # used to set arbitrary properties on arbitrary types of objects!