Allow to invite/edit attendees to other user's shared events when either

a) in a globally shared (anonymous) calendar or
b) when enabled by config using the new option 'calendar_allow_invite_shared'

Fixes bug #1758

3 files changed, 12 insertions, 6 deletions

diff --git a/plugins/calendar/calendar.php b/plugins/calendar/calendar.php
index 69df2e4..af700d1 100644
--- a/plugins/calendar/calendar.php
+++ b/plugins/calendar/calendar.php
@@ -56,6 +56,7 @@ class calendar extends rcube_plugin
     'calendar_agenda_sections' => 'smart',
     'calendar_event_coloring'  => 0,
     'calendar_time_indicator'  => true,
+    'calendar_allow_invite_shared' => false,
   );
 
   private $ics_parts = array();
@@ -1047,6 +1048,7 @@ class calendar extends rcube_plugin
     $settings['agenda_sections'] = $this->rc->config->get('calendar_agenda_sections', $this->defaults['calendar_agenda_sections']);
     $settings['event_coloring'] = (int)$this->rc->config->get('calendar_event_coloring', $this->defaults['calendar_event_coloring']);
     $settings['time_indicator'] = (int)$this->rc->config->get('calendar_time_indicator', $this->defaults['calendar_time_indicator']);
+    $settings['invite_shared'] = (int)$this->rc->config->get('calendar_allow_invite_shared', $this->defaults['calendar_allow_invite_shared']);
 
     // get user identity to create default attendee
     if ($this->ui->screen == 'calendar') {
diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
index d5a86a7..68ff6c9 100644
--- a/plugins/calendar/calendar_ui.js
+++ b/plugins/calendar/calendar_ui.js
@@ -531,17 +531,18 @@ function rcube_calendar_ui(settings)
         $('#edit-recurring-warning').hide();
 
       // init attendees tab
-      var organizer = !event.attendees || is_organizer(event);
+      var organizer = !event.attendees || is_organizer(event),
+        allow_invitations = organizer || (calendar.owner && calendar.owner == 'anonymous') || settings.invite_shared;
       event_attendees = [];
       attendees_list = $('#edit-attendees-table > tbody').html('');
-      $('#edit-attendees-notify')[(notify.checked && organizer ? 'show' : 'hide')]();
-      $('#edit-localchanges-warning')[(has_attendees(event) && !(organizer || (calendar.owner && is_organizer(event, calendar.owner))) ? 'show' : 'hide')]();
+      $('#edit-attendees-notify')[(notify.checked && allow_invitations ? 'show' : 'hide')]();
+      $('#edit-localchanges-warning')[(has_attendees(event) && !(allow_invitations || (calendar.owner && is_organizer(event, calendar.owner))) ? 'show' : 'hide')]();
 
       var load_attendees_tab = function()
       {
         if (event.attendees) {
           for (var j=0; j < event.attendees.length; j++)
-            add_attendee(event.attendees[j], !organizer);
+            add_attendee(event.attendees[j], !allow_invitations);
         }
 
         // select the correct organizer identity
@@ -553,7 +554,7 @@ function rcube_calendar_ui(settings)
           }
         });
         $('#edit-identities-list').val(identity_id);
-        $('#edit-attendees-form')[(organizer?'show':'hide')]();
+        $('#edit-attendees-form')[(allow_invitations?'show':'hide')]();
         $('#edit-attendee-schedule')[(calendar.freebusy?'show':'hide')]();
       };
 
@@ -638,7 +639,7 @@ function rcube_calendar_ui(settings)
           data.attendees = [];
         
         // tell server to send notifications
-        if ((data.attendees.length || (event.id && event.attendees.length)) && organizer && (notify.checked || invite.checked)) {
+        if ((data.attendees.length || (event.id && event.attendees.length)) && allow_invitations && (notify.checked || invite.checked)) {
           data._notify = 1;
         }
 
diff --git a/plugins/calendar/config.inc.php.dist b/plugins/calendar/config.inc.php.dist
index fb642ec..a8d5da8 100644
--- a/plugins/calendar/config.inc.php.dist
+++ b/plugins/calendar/config.inc.php.dist
@@ -104,6 +104,9 @@ $rcmail_config['calendar_categories'] = array(
    'Holiday' => 'ff6600',
 );
 
+// enable users to invite/edit attendees for shared events organized by others
+$rcmail_config['calendar_allow_invite_shared'] = false;
+
 // enable asynchronous free-busy triggering after data changed
 $rcmail_config['calendar_freebusy_trigger'] = false;