Add option to disable registration

src/Wallabag/UserBundle/DependencyInjection/Configuration.php

@@ -12,6 +12,14 @@ class Configuration implements ConfigurationInterface
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('wallabag_user');
 
+        $rootNode
+            ->children()
+                ->booleanNode('registration_enabled')
+                    ->defaultValue(true)
+                ->end()
+            ->end()
+        ;
+
         return $treeBuilder;
     }
 }

src/Wallabag/UserBundle/DependencyInjection/WallabagUserExtension.php

@@ -16,6 +16,7 @@ class WallabagUserExtension extends Extension
 
         $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.yml');
+        $container->setParameter('wallabag_user.registration_enabled', $config['registration_enabled']);
     }
 
     public function getAlias()