Managesieve allowed hosts (#6292)

* Introduce managesieve_allowed_hosts setting

If managesieve_allowed_hosts has been set, then check that the array contains the current mail_host for the user session. If not, just return. This will cause the managesieve plugin to not appear under the settings menu.

* Include managesieve_allowed_hosts example

An example of the managesieve_allowed_hosts setting is included. By default, it is left commented to preserve existing behaviour.

plugins/managesieve/config.inc.php.dist

@@ -121,3 +121,10 @@ $config['managesieve_raw_editor'] = true;
 // list_sets, enable_disable_set, delete_set, new_set, download_set, new_rule, delete_rule
 // Note: disabling list_sets removes the Filter sets widget from the UI and means the set defined in managesieve_script_name will always be used (and activated)
 $config['managesieve_disabled_actions'] = array();
+
+// Allowed hosts
+// Only activate managesieve for selected hosts
+// If this is not set, existing behaviour is maintained.
+// If set, managesieve will work only for hosts contained in the managesieve_allowed_hosts array
+// $config['managesieve_allowed_hosts'] = array('host1.mydomain.com','host2.mydomain.com');
+

plugins/managesieve/managesieve.php

@@ -101,7 +101,13 @@ class managesieve extends rcube_plugin
     function settings_actions($args)
     {
         $this->load_config();
-
+        
+        if( $this->rc->config->get('managesieve_allowed_hosts') !== null  &&
+           ! in_array( $this->rc->user->data['mail_host'],
+                      $this->rc->config->get('managesieve_allowed_hosts') ) ){
+                return;
+        }
+        
         $vacation_mode = (int) $this->rc->config->get('managesieve_vacation');
         $forward_mode = (int) $this->rc->config->get('managesieve_forward');