add a check for authentication plugin on startup and respond according to no_auth config option. allows instance to be run w/o authentication

mediagoblin/auth/tools.py

@@ -14,10 +14,16 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import logging
+import sys
 import wtforms
 
+from mediagoblin import mg_globals
 from mediagoblin.tools.mail import normalize_email
 from mediagoblin.tools.translate import lazy_pass_to_ugettext as _
+from mediagoblin.tools.pluginapi import hook_handle
+
+_log = logging.getLogger(__name__)
 
 
 def normalize_user_or_email_field(allow_email=True, allow_user=True):
@@ -48,3 +54,19 @@ def normalize_user_or_email_field(allow_email=True, allow_user=True):
         if field.data is None:  # should not happen, but be cautious anyway
             raise wtforms.ValidationError(message)
     return _normalize_field
+
+
+def check_auth_enabled():
+    no_auth = mg_globals.app_config['no_auth']
+    auth_plugin = True if hook_handle('auth') is not None else False
+
+    if no_auth == 'false' and not auth_plugin:
+        print 'No authentication plugin is enabled and no_auth = false in ' \
+              'config! \n..Exiting'
+        sys.exit()
+
+    if no_auth == 'true' and not auth_plugin:
+        _log.warning('No authentication is enabled')
+        return False
+    else:
+        return True

mediagoblin/auth/views.py

@@ -44,8 +44,9 @@ def register(request):
     Note that usernames will always be lowercased. Email domains are lowercased while
     the first part remains case-sensitive.
     """
-    # Redirects to indexpage if registrations are disabled
-    if not mg_globals.app_config["allow_registration"]:
+    # Redirects to indexpage if registrations are disabled or no authentication
+    # is enabled
+    if not mg_globals.app_config["allow_registration"] or not mg_globals.app.auth:
         messages.add_message(
             request,
             messages.WARNING,
@@ -88,6 +89,14 @@ def login(request):
 
     If you provide the POST with 'next', it'll redirect to that view.
     """
+    # Redirects to index page if no authentication is enabled
+    if not mg_globals.app.auth:
+        messages.add_message(
+            request,
+            messages.WARNING,
+            _('Sorry, authentication is disabled on this instance.'))
+        return redirect(request, 'index')
+
     login_form = auth.get_login_form(request)
 
     login_failed = False