let system administrators disallow certain admin panels

lib/adminpanelaction.php

@@ -70,7 +70,7 @@ class AdminPanelAction extends Action
 
         if (!common_logged_in()) {
             $this->clientError(_('Not logged in.'));
-            return;
+            return false;
         }
 
         $user = common_current_user();
@@ -94,7 +94,18 @@ class AdminPanelAction extends Action
 
         if (!$user->hasRight(Right::CONFIGURESITE)) {
             $this->clientError(_('You cannot make changes to this site.'));
-            return;
+            return false;
+        }
+
+        // This panel must be enabled
+
+        $name = $this->trimmed('action');
+
+        $name = mb_substr($name, 0, -10);
+
+        if (!in_array($name, common_config('admin', 'panels'))) {
+            $this->clientError(_('Changes to that panel are not allowed.'), 403);
+            return false;
         }
 
         return true;
@@ -296,20 +307,33 @@ class AdminPanelNav extends Widget
 
         if (Event::handle('StartAdminPanelNav', array($this))) {
 
+            if ($this->canAdmin('site')) {
                 $this->out->menuItem(common_local_url('siteadminpanel'), _('Site'),
                                      _('Basic site configuration'), $action_name == 'siteadminpanel', 'nav_site_admin_panel');
+            }
 
+            if ($this->canAdmin('design')) {
                 $this->out->menuItem(common_local_url('designadminpanel'), _('Design'),
                                      _('Design configuration'), $action_name == 'designadminpanel', 'nav_design_admin_panel');
+            }
 
+            if ($this->canAdmin('user')) {
                 $this->out->menuItem(common_local_url('useradminpanel'), _('User'),
                                      _('Paths configuration'), $action_name == 'useradminpanel', 'nav_design_admin_panel');
+            }
 
+            if ($this->canAdmin('paths')) {
                 $this->out->menuItem(common_local_url('pathsadminpanel'), _('Paths'),
                                      _('Paths configuration'), $action_name == 'pathsadminpanel', 'nav_design_admin_panel');
+            }
 
             Event::handle('EndAdminPanelNav', array($this));
         }
         $this->action->elementEnd('ul');
     }
+
+    function canAdmin($name)
+    {
+        return in_array($name, common_config('admin', 'panels'));
+    }
 }

lib/default.php

@@ -246,5 +246,7 @@ $default =
                                  'Linkback' => null,
                                  'WikiHashtags' => null,
                                  'OpenID' => null),
-              )
+              ),
+        'admin' =>
+        array('panels' => array('design', 'site', 'user', 'paths')),
         );