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	diff --git a/plugins/calendar/calendar.php b/plugins/calendar/calendar.php
	index 64dc2ced..98bdac43 100644
	--- a/plugins/calendar/calendar.php
	+++ b/plugins/calendar/calendar.php
	@@ -1,3114 +1,3121 @@
	<?php

	/**
	* Calendar plugin for Roundcube webmail
	*
	* @author Lazlo Westerhof <hello@lazlo.me>
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
	* Copyright (C) 2014, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* 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/>.
	*/

	class calendar extends rcube_plugin
	{
	const FREEBUSY_UNKNOWN = 0;
	const FREEBUSY_FREE = 1;
	const FREEBUSY_BUSY = 2;
	const FREEBUSY_TENTATIVE = 3;
	const FREEBUSY_OOF = 4;

	const SESSION_KEY = 'calendar_temp';

	public $task = '?(?!logout).*';
	public $rc;
	public $lib;
	public $resources_dir;
	public $home; // declare public to be used in other classes
	public $urlbase;
	public $timezone;
	public $timezone_offset;
	public $gmt_offset;
	public $ui;

	public $defaults = array(
	'calendar_default_view' => "agendaWeek",
	'calendar_timeslots' => 2,
	'calendar_work_start' => 6,
	'calendar_work_end' => 18,
	'calendar_agenda_range' => 60,
	'calendar_agenda_sections' => 'smart',
	'calendar_event_coloring' => 0,
	'calendar_time_indicator' => true,
	'calendar_allow_invite_shared' => false,
	'calendar_itip_send_option' => 3,
	'calendar_itip_after_action' => 0,
	);

	private $ical;
	private $itip;
	private $driver;


	/**
	* Plugin initialization.
	*/
	function init()
	{
	$this->require_plugin('libcalendaring');

	$this->rc = rcube::get_instance();
	$this->lib = libcalendaring::get_instance();

	$this->register_task('calendar', 'calendar');

	// load calendar configuration
	$this->load_config();

	// load localizations
	$this->add_texts('localization/', $this->rc->task == 'calendar' && (!$this->rc->action \|\| $this->rc->action == 'print'));

	$this->timezone = $this->lib->timezone;
	$this->gmt_offset = $this->lib->gmt_offset;
	$this->dst_active = $this->lib->dst_active;
	$this->timezone_offset = $this->gmt_offset / 3600 - $this->dst_active;

	require($this->home . '/lib/calendar_ui.php');
	$this->ui = new calendar_ui($this);

	// catch iTIP confirmation requests that don're require a valid session
	if ($this->rc->action == 'attend' && !empty($_REQUEST['_t'])) {
	$this->add_hook('startup', array($this, 'itip_attend_response'));
	}
	else if ($this->rc->action == 'feed' && !empty($_REQUEST['_cal'])) {
	$this->add_hook('startup', array($this, 'ical_feed_export'));
	}
	else {
	// default startup routine
	$this->add_hook('startup', array($this, 'startup'));
	}

	$this->add_hook('user_delete', array($this, 'user_delete'));
	}

	/**
	* Startup hook
	*/
	public function startup($args)
	{
	// the calendar module can be enabled/disabled by the kolab_auth plugin
	if ($this->rc->config->get('calendar_disabled', false) \|\| !$this->rc->config->get('calendar_enabled', true))
	return;

	// load Calendar user interface
	if (!$this->rc->output->ajax_call && (!$this->rc->output->env['framed'] \|\| $args['action'] == 'preview')) {
	$this->ui->init();

	// settings are required in (almost) every GUI step
	if ($args['action'] != 'attend')
	$this->rc->output->set_env('calendar_settings', $this->load_settings());
	}

	if ($args['task'] == 'calendar' && $args['action'] != 'save-pref') {
	if ($args['action'] != 'upload') {
	$this->load_driver();
	}

	// register calendar actions
	$this->register_action('index', array($this, 'calendar_view'));
	$this->register_action('event', array($this, 'event_action'));
	$this->register_action('calendar', array($this, 'calendar_action'));
	$this->register_action('count', array($this, 'count_events'));
	$this->register_action('load_events', array($this, 'load_events'));
	$this->register_action('export_events', array($this, 'export_events'));
	$this->register_action('import_events', array($this, 'import_events'));
	$this->register_action('upload', array($this, 'attachment_upload'));
	$this->register_action('get-attachment', array($this, 'attachment_get'));
	$this->register_action('freebusy-status', array($this, 'freebusy_status'));
	$this->register_action('freebusy-times', array($this, 'freebusy_times'));
	$this->register_action('randomdata', array($this, 'generate_randomdata'));
	$this->register_action('print', array($this,'print_view'));
	$this->register_action('mailimportitip', array($this, 'mail_import_itip'));
	$this->register_action('mailimportattach', array($this, 'mail_import_attachment'));
	$this->register_action('mailtoevent', array($this, 'mail_message2event'));
	$this->register_action('inlineui', array($this, 'get_inline_ui'));
	$this->register_action('check-recent', array($this, 'check_recent'));
	$this->register_action('itip-status', array($this, 'event_itip_status'));
	$this->register_action('itip-remove', array($this, 'event_itip_remove'));
	$this->register_action('itip-decline-reply', array($this, 'mail_itip_decline_reply'));
	$this->register_action('itip-delegate', array($this, 'mail_itip_delegate'));
	$this->register_action('resources-list', array($this, 'resources_list'));
	$this->register_action('resources-owner', array($this, 'resources_owner'));
	$this->register_action('resources-calendar', array($this, 'resources_calendar'));
	$this->register_action('resources-autocomplete', array($this, 'resources_autocomplete'));
	$this->add_hook('refresh', array($this, 'refresh'));

	// remove undo information...
	if ($undo = $_SESSION['calendar_event_undo']) {
	// ...after timeout
	$undo_time = $this->rc->config->get('undo_timeout', 0);
	if ($undo['ts'] < time() - $undo_time) {
	$this->rc->session->remove('calendar_event_undo');
	// @TODO: do EXPUNGE on kolab objects?
	}
	}
	}
	else if ($args['task'] == 'settings') {
	// add hooks for Calendar settings
	$this->add_hook('preferences_sections_list', array($this, 'preferences_sections_list'));
	$this->add_hook('preferences_list', array($this, 'preferences_list'));
	$this->add_hook('preferences_save', array($this, 'preferences_save'));
	}
	else if ($args['task'] == 'mail') {
	// hooks to catch event invitations on incoming mails
	if ($args['action'] == 'show' \|\| $args['action'] == 'preview') {
	$this->add_hook('template_object_messagebody', array($this, 'mail_messagebody_html'));
	}

	// add 'Create event' item to message menu
	if ($this->api->output->type == 'html') {
	$this->api->add_content(html::tag('li', null,
	$this->api->output->button(array(
	'command' => 'calendar-create-from-mail',
	'label' => 'calendar.createfrommail',
	'type' => 'link',
	'classact' => 'icon calendarlink active',
	'class' => 'icon calendarlink',
	'innerclass' => 'icon calendar',
	))),
	'messagemenu');

	$this->api->output->add_label('calendar.createfrommail');
	}

	$this->add_hook('messages_list', array($this, 'mail_messages_list'));
	$this->add_hook('message_compose', array($this, 'mail_message_compose'));
	}
	else if ($args['task'] == 'addressbook') {
	if ($this->rc->config->get('calendar_contact_birthdays')) {
	$this->add_hook('contact_update', array($this, 'contact_update'));
	$this->add_hook('contact_create', array($this, 'contact_update'));
	}
	}

	// add hooks to display alarms
	$this->add_hook('pending_alarms', array($this, 'pending_alarms'));
	$this->add_hook('dismiss_alarms', array($this, 'dismiss_alarms'));
	}

	/**
	* Helper method to load the backend driver according to local config
	*/
	private function load_driver()
	{
	if (is_object($this->driver))
	return;

	$driver_name = $this->rc->config->get('calendar_driver', 'database');
	$driver_class = $driver_name . '_driver';

	require_once($this->home . '/drivers/calendar_driver.php');
	require_once($this->home . '/drivers/' . $driver_name . '/' . $driver_class . '.php');

	$this->driver = new $driver_class($this);

	if ($this->driver->undelete)
	$this->driver->undelete = $this->rc->config->get('undo_timeout', 0) > 0;
	}

	/**
	* Load iTIP functions
	*/
	private function load_itip()
	{
	if (!$this->itip) {
	require_once($this->home . '/lib/calendar_itip.php');
	$this->itip = new calendar_itip($this);

	if ($this->rc->config->get('kolab_invitation_calendars'))
	$this->itip->set_rsvp_actions(array('accepted','tentative','declined','delegated','needs-action'));
	}

	return $this->itip;
	}

	/**
	* Load iCalendar functions
	*/
	public function get_ical()
	{
	if (!$this->ical) {
	$this->ical = libcalendaring::get_ical();
	}

	return $this->ical;
	}

	/**
	* Get properties of the calendar this user has specified as default
	*/
	public function get_default_calendar($writeable = false, $confidential = false)
	{
	$default_id = $this->rc->config->get('calendar_default_calendar');
	$calendars = $this->driver->list_calendars(false, true);
	$calendar = $calendars[$default_id] ?: null;
	if (!$calendar \|\| $confidential \|\| ($writeable && $calendar['readonly'])) {
	foreach ($calendars as $cal) {
	if ($confidential && $cal['subtype'] == 'confidential') {
	$calendar = $cal;
	break;
	}
	if ($cal['default']) {
	$calendar = $cal;
	if (!$confidential)
	break;
	}
	if (!$writeable \|\| !$cal['readonly']) {
	$first = $cal;
	}
	}
	}

	return $calendar ?: $first;
	}


	/**
	* Render the main calendar view from skin template
	*/
	function calendar_view()
	{
	$this->rc->output->set_pagetitle($this->gettext('calendar'));

	// Add CSS stylesheets to the page header
	$this->ui->addCSS();

	// Add JS files to the page header
	$this->ui->addJS();

	$this->ui->init_templates();
	$this->rc->output->add_label('lowest','low','normal','high','highest','delete','cancel','uploading','noemailwarning','close');
	$this->rc->output->add_label('libcalendaring.itipaccepted','libcalendaring.itiptentative','libcalendaring.itipdeclined','libcalendaring.itipdelegated','libcalendaring.expandattendeegroup','libcalendaring.expandattendeegroupnodata');

	// initialize attendees autocompletion
	rcube_autocomplete_init();

	$this->rc->output->set_env('timezone', $this->timezone->getName());
	$this->rc->output->set_env('calendar_driver', $this->rc->config->get('calendar_driver'), false);
	$this->rc->output->set_env('calendar_resources', (bool)$this->rc->config->get('calendar_resources_driver'));
	$this->rc->output->set_env('mscolors', jqueryui::get_color_values());
	$this->rc->output->set_env('identities-selector', $this->ui->identity_select(array('id' => 'edit-identities-list', 'aria-label' => $this->gettext('roleorganizer'))));

	$view = rcube_utils::get_input_value('view', rcube_utils::INPUT_GPC);
	if (in_array($view, array('agendaWeek', 'agendaDay', 'month', 'table')))
	$this->rc->output->set_env('view', $view);

	if ($date = rcube_utils::get_input_value('date', rcube_utils::INPUT_GPC))
	$this->rc->output->set_env('date', $date);

	if ($msgref = rcube_utils::get_input_value('itip', rcube_utils::INPUT_GPC))
	$this->rc->output->set_env('itip_events', $this->itip_events($msgref));

	$this->rc->output->send("calendar.calendar");
	}

	/**
	* Handler for preferences_sections_list hook.
	* Adds Calendar settings sections into preferences sections list.
	*
	* @param array Original parameters
	* @return array Modified parameters
	*/
	function preferences_sections_list($p)
	{
	$p['list']['calendar'] = array(
	'id' => 'calendar', 'section' => $this->gettext('calendar'),
	);

	return $p;
	}

	/**
	* Handler for preferences_list hook.
	* Adds options blocks into Calendar settings sections in Preferences.
	*
	* @param array Original parameters
	* @return array Modified parameters
	*/
	function preferences_list($p)
	{
	if ($p['section'] != 'calendar') {
	return $p;
	}

	$no_override = array_flip((array)$this->rc->config->get('dont_override'));

	$p['blocks']['view']['name'] = $this->gettext('mainoptions');

	if (!isset($no_override['calendar_default_view'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_default_view';
	$select = new html_select(array('name' => '_default_view', 'id' => $field_id));
	$select->add($this->gettext('day'), "agendaDay");
	$select->add($this->gettext('week'), "agendaWeek");
	$select->add($this->gettext('month'), "month");
	$select->add($this->gettext('agenda'), "table");
	$p['blocks']['view']['options']['default_view'] = array(
	'title' => html::label($field_id, Q($this->gettext('default_view'))),
	'content' => $select->show($this->rc->config->get('calendar_default_view', $this->defaults['calendar_default_view'])),
	);
	}

	if (!isset($no_override['calendar_timeslots'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_timeslot';
	$choices = array('1', '2', '3', '4', '6');
	$select = new html_select(array('name' => '_timeslots', 'id' => $field_id));
	$select->add($choices);
	$p['blocks']['view']['options']['timeslots'] = array(
	'title' => html::label($field_id, Q($this->gettext('timeslots'))),
	'content' => $select->show(strval($this->rc->config->get('calendar_timeslots', $this->defaults['calendar_timeslots']))),
	);
	}

	if (!isset($no_override['calendar_first_day'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_firstday';
	$select = new html_select(array('name' => '_first_day', 'id' => $field_id));
	$select->add(rcube_label('sunday'), '0');
	$select->add(rcube_label('monday'), '1');
	$select->add(rcube_label('tuesday'), '2');
	$select->add(rcube_label('wednesday'), '3');
	$select->add(rcube_label('thursday'), '4');
	$select->add(rcube_label('friday'), '5');
	$select->add(rcube_label('saturday'), '6');
	$p['blocks']['view']['options']['first_day'] = array(
	'title' => html::label($field_id, Q($this->gettext('first_day'))),
	'content' => $select->show(strval($this->rc->config->get('calendar_first_day', $this->defaults['calendar_first_day']))),
	);
	}

	if (!isset($no_override['calendar_first_hour'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$time_format = $this->rc->config->get('time_format', libcalendaring::to_php_date_format($this->rc->config->get('calendar_time_format', $this->defaults['calendar_time_format'])));
	$select_hours = new html_select();
	for ($h = 0; $h < 24; $h++)
	$select_hours->add(date($time_format, mktime($h, 0, 0)), $h);

	$field_id = 'rcmfd_firsthour';
	$p['blocks']['view']['options']['first_hour'] = array(
	'title' => html::label($field_id, Q($this->gettext('first_hour'))),
	'content' => $select_hours->show($this->rc->config->get('calendar_first_hour', $this->defaults['calendar_first_hour']), array('name' => '_first_hour', 'id' => $field_id)),
	);
	}

	if (!isset($no_override['calendar_work_start'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_workstart';
	$p['blocks']['view']['options']['workinghours'] = array(
	'title' => html::label($field_id, Q($this->gettext('workinghours'))),
	'content' => $select_hours->show($this->rc->config->get('calendar_work_start', $this->defaults['calendar_work_start']), array('name' => '_work_start', 'id' => $field_id)) .
	' — ' . $select_hours->show($this->rc->config->get('calendar_work_end', $this->defaults['calendar_work_end']), array('name' => '_work_end', 'id' => $field_id)),
	);
	}

	if (!isset($no_override['calendar_event_coloring'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_coloring';
	$select_colors = new html_select(array('name' => '_event_coloring', 'id' => $field_id));
	$select_colors->add($this->gettext('coloringmode0'), 0);
	$select_colors->add($this->gettext('coloringmode1'), 1);
	$select_colors->add($this->gettext('coloringmode2'), 2);
	$select_colors->add($this->gettext('coloringmode3'), 3);

	$p['blocks']['view']['options']['eventcolors'] = array(
	'title' => html::label($field_id . 'value', Q($this->gettext('eventcoloring'))),
	'content' => $select_colors->show($this->rc->config->get('calendar_event_coloring', $this->defaults['calendar_event_coloring'])),
	);
	}

	// loading driver is expensive, don't do it if not needed
	$this->load_driver();

	if (!isset($no_override['calendar_default_alarm_type'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_alarm';
	$select_type = new html_select(array('name' => '_alarm_type', 'id' => $field_id));
	$select_type->add($this->gettext('none'), '');
	foreach ($this->driver->alarm_types as $type)
	$select_type->add(rcube_label(strtolower("alarm{$type}option"), 'libcalendaring'), $type);

	$p['blocks']['view']['options']['alarmtype'] = array(
	'title' => html::label($field_id, Q($this->gettext('defaultalarmtype'))),
	'content' => $select_type->show($this->rc->config->get('calendar_default_alarm_type', '')),
	);
	}

	if (!isset($no_override['calendar_default_alarm_offset'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_alarm';
	$input_value = new html_inputfield(array('name' => '_alarm_value', 'id' => $field_id . 'value', 'size' => 3));
	$select_offset = new html_select(array('name' => '_alarm_offset', 'id' => $field_id . 'offset'));
	foreach (array('-M','-H','-D','+M','+H','+D') as $trigger)
	$select_offset->add(rcube_label('trigger' . $trigger, 'libcalendaring'), $trigger);

	$preset = libcalendaring::parse_alarm_value($this->rc->config->get('calendar_default_alarm_offset', '-15M'));
	$p['blocks']['view']['options']['alarmoffset'] = array(
	'title' => html::label($field_id . 'value', Q($this->gettext('defaultalarmoffset'))),
	'content' => $input_value->show($preset[0]) . ' ' . $select_offset->show($preset[1]),
	);
	}

	if (!isset($no_override['calendar_default_calendar'])) {
	if (!$p['current']) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}
	// default calendar selection
	$field_id = 'rcmfd_default_calendar';
	$select_cal = new html_select(array('name' => '_default_calendar', 'id' => $field_id, 'is_escaped' => true));
	foreach ((array)$this->driver->list_calendars(false, true) as $id => $prop) {
	$select_cal->add($prop['name'], strval($id));
	if ($prop['default'])
	$default_calendar = $id;
	}
	$p['blocks']['view']['options']['defaultcalendar'] = array(
	'title' => html::label($field_id . 'value', Q($this->gettext('defaultcalendar'))),
	'content' => $select_cal->show($this->rc->config->get('calendar_default_calendar', $default_calendar)),
	);
	}

	$p['blocks']['itip']['name'] = $this->gettext('itipoptions');

	// Invitations handling
	if (!isset($no_override['calendar_itip_after_action'])) {
	if (!$p['current']) {
	$p['blocks']['itip']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_after_action';
	$select = new html_select(array('name' => '_after_action', 'id' => $field_id,
	'onchange' => "\$('#{$field_id}_select')[this.value == 4 ? 'show' : 'hide']()"));

	$select->add($this->gettext('afternothing'), '');
	$select->add($this->gettext('aftertrash'), 1);
	$select->add($this->gettext('afterdelete'), 2);
	$select->add($this->gettext('afterflagdeleted'), 3);
	$select->add($this->gettext('aftermoveto'), 4);

	$val = $this->rc->config->get('calendar_itip_after_action', $this->defaults['calendar_itip_after_action']);
	if ($val !== null && $val !== '' && !is_int($val)) {
	$folder = $val;
	$val = 4;
	}

	$folders = $this->rc->folder_selector(array(
	'id' => $field_id . '_select',
	'name' => '_after_action_folder',
	'maxlength' => 30,
	'folder_filter' => 'mail',
	'folder_rights' => 'w',
	'style' => $val !== 4 ? 'display:none' : '',
	));

	$p['blocks']['itip']['options']['after_action'] = array(
	'title' => html::label($field_id, Q($this->gettext('afteraction'))),
	'content' => $select->show($val) . $folders->show($folder),
	);
	}

	// category definitions
	if (!$this->driver->nocategories && !isset($no_override['calendar_categories'])) {
	$p['blocks']['categories']['name'] = $this->gettext('categories');

	if (!$p['current']) {
	$p['blocks']['categories']['content'] = true;
	return $p;
	}

	$categories = (array) $this->driver->list_categories();
	$categories_list = '';
	foreach ($categories as $name => $color) {
	$key = md5($name);
	$field_class = 'rcmfd_category_' . str_replace(' ', '_', $name);
	$category_remove = new html_inputfield(array('type' => 'button', 'value' => 'X', 'class' => 'button', 'onclick' => '$(this).parent().remove()', 'title' => $this->gettext('remove_category')));
	$category_name = new html_inputfield(array('name' => "_categories[$key]", 'class' => $field_class, 'size' => 30, 'disabled' => $this->driver->categoriesimmutable));
	$category_color = new html_inputfield(array('name' => "_colors[$key]", 'class' => "$field_class colors", 'size' => 6));
	$hidden = $this->driver->categoriesimmutable ? html::tag('input', array('type' => 'hidden', 'name' => "_categories[$key]", 'value' => $name)) : '';
	$categories_list .= html::div(null, $hidden . $category_name->show($name) . ' ' . $category_color->show($color) . ' ' . $category_remove->show());
	}

	$p['blocks']['categories']['options']['category_' . $name] = array(
	'content' => html::div(array('id' => 'calendarcategories'), $categories_list),
	);

	$field_id = 'rcmfd_new_category';
	$new_category = new html_inputfield(array('name' => '_new_category', 'id' => $field_id, 'size' => 30));
	$add_category = new html_inputfield(array('type' => 'button', 'class' => 'button', 'value' => $this->gettext('add_category'), 'onclick' => "rcube_calendar_add_category()"));
	$p['blocks']['categories']['options']['categories'] = array(
	'content' => $new_category->show('') . ' ' . $add_category->show(),
	);

	$this->rc->output->add_script('function rcube_calendar_add_category(){
	var name = $("#rcmfd_new_category").val();
	if (name.length) {
	var input = $("<input>").attr("type", "text").attr("name", "_categories[]").attr("size", 30).val(name);
	var color = $("<input>").attr("type", "text").attr("name", "_colors[]").attr("size", 6).addClass("colors").val("000000");
	var button = $("<input>").attr("type", "button").attr("value", "X").addClass("button").click(function(){ $(this).parent().remove() });
	$("<div>").append(input).append(" ").append(color).append(" ").append(button).appendTo("#calendarcategories");
	color.miniColors({ colorValues:(rcmail.env.mscolors \|\| []) });
	$("#rcmfd_new_category").val("");
	}
	}');

	$this->rc->output->add_script('$("#rcmfd_new_category").keypress(function(event){
	if (event.which == 13) {
	rcube_calendar_add_category();
	event.preventDefault();
	}
	});
	', 'docready');

	// load miniColors js/css files
	jqueryui::miniColors();
	}

	// virtual birthdays calendar
	if (!isset($no_override['calendar_contact_birthdays'])) {
	$p['blocks']['birthdays']['name'] = $this->gettext('birthdayscalendar');

	if (!$p['current']) {
	$p['blocks']['birthdays']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_contact_birthdays';
	$input = new html_checkbox(array('name' => '_contact_birthdays', 'id' => $field_id, 'value' => 1, 'onclick' => '$(".calendar_birthday_props").prop("disabled",!this.checked)'));

	$p['blocks']['birthdays']['options']['contact_birthdays'] = array(
	'title' => html::label($field_id, $this->gettext('displaybirthdayscalendar')),
	'content' => $input->show($this->rc->config->get('calendar_contact_birthdays')?1:0),
	);

	$input_attrib = array(
	'class' => 'calendar_birthday_props',
	'disabled' => !$this->rc->config->get('calendar_contact_birthdays'),
	);

	$sources = array();
	$checkbox = new html_checkbox(array('name' => '_birthday_adressbooks[]') + $input_attrib);
	foreach ($this->rc->get_address_sources(false, true) as $source) {
	$active = in_array($source['id'], (array)$this->rc->config->get('calendar_birthday_adressbooks', array())) ? $source['id'] : '';
	$sources[] = html::label(null, $checkbox->show($active, array('value' => $source['id'])) . ' ' . rcube::Q($source['realname'] ?: $source['name']));
	}

	$p['blocks']['birthdays']['options']['birthday_adressbooks'] = array(
	'title' => rcube::Q($this->gettext('birthdayscalendarsources')),
	'content' => join(html::br(), $sources),
	);

	$field_id = 'rcmfd_birthdays_alarm';
	$select_type = new html_select(array('name' => '_birthdays_alarm_type', 'id' => $field_id) + $input_attrib);
	$select_type->add($this->gettext('none'), '');
	foreach ($this->driver->alarm_types as $type) {
	$select_type->add(rcube_label(strtolower("alarm{$type}option"), 'libcalendaring'), $type);
	}

	$input_value = new html_inputfield(array('name' => '_birthdays_alarm_value', 'id' => $field_id . 'value', 'size' => 3) + $input_attrib);
	$select_offset = new html_select(array('name' => '_birthdays_alarm_offset', 'id' => $field_id . 'offset') + $input_attrib);
	foreach (array('-M','-H','-D') as $trigger)
	$select_offset->add(rcube_label('trigger' . $trigger, 'libcalendaring'), $trigger);

	$preset = libcalendaring::parse_alarm_value($this->rc->config->get('calendar_birthdays_alarm_offset', '-1D'));
	$p['blocks']['birthdays']['options']['birthdays_alarmoffset'] = array(
	'title' => html::label($field_id . 'value', rcube::Q($this->gettext('showalarms'))),
	'content' => $select_type->show($this->rc->config->get('calendar_birthdays_alarm_type', '')) . ' ' . $input_value->show($preset[0]) . ' ' . $select_offset->show($preset[1]),
	);
	}

	return $p;
	}

	/**
	* Handler for preferences_save hook.
	* Executed on Calendar settings form submit.
	*
	* @param array Original parameters
	* @return array Modified parameters
	*/
	function preferences_save($p)
	{
	if ($p['section'] == 'calendar') {
	$this->load_driver();

	// compose default alarm preset value
	$alarm_offset = rcube_utils::get_input_value('_alarm_offset', rcube_utils::INPUT_POST);
	$alarm_value = rcube_utils::get_input_value('_alarm_value', rcube_utils::INPUT_POST);
	$default_alarm = $alarm_offset[0] . intval($alarm_value) . $alarm_offset[1];

	$birthdays_alarm_offset = rcube_utils::get_input_value('_birthdays_alarm_offset', rcube_utils::INPUT_POST);
	$birthdays_alarm_value = rcube_utils::get_input_value('_birthdays_alarm_value', rcube_utils::INPUT_POST);
	$birthdays_alarm_value = $birthdays_alarm_offset[0] . intval($birthdays_alarm_value) . $birthdays_alarm_offset[1];

	$p['prefs'] = array(
	'calendar_default_view' => rcube_utils::get_input_value('_default_view', rcube_utils::INPUT_POST),
	'calendar_timeslots' => intval(rcube_utils::get_input_value('_timeslots', rcube_utils::INPUT_POST)),
	'calendar_first_day' => intval(rcube_utils::get_input_value('_first_day', rcube_utils::INPUT_POST)),
	'calendar_first_hour' => intval(rcube_utils::get_input_value('_first_hour', rcube_utils::INPUT_POST)),
	'calendar_work_start' => intval(rcube_utils::get_input_value('_work_start', rcube_utils::INPUT_POST)),
	'calendar_work_end' => intval(rcube_utils::get_input_value('_work_end', rcube_utils::INPUT_POST)),
	'calendar_event_coloring' => intval(rcube_utils::get_input_value('_event_coloring', rcube_utils::INPUT_POST)),
	'calendar_default_alarm_type' => rcube_utils::get_input_value('_alarm_type', rcube_utils::INPUT_POST),
	'calendar_default_alarm_offset' => $default_alarm,
	'calendar_default_calendar' => rcube_utils::get_input_value('_default_calendar', rcube_utils::INPUT_POST),
	'calendar_date_format' => null, // clear previously saved values
	'calendar_time_format' => null,
	'calendar_contact_birthdays' => rcube_utils::get_input_value('_contact_birthdays', rcube_utils::INPUT_POST) ? true : false,
	'calendar_birthday_adressbooks' => (array) rcube_utils::get_input_value('_birthday_adressbooks', rcube_utils::INPUT_POST),
	'calendar_birthdays_alarm_type' => rcube_utils::get_input_value('_birthdays_alarm_type', rcube_utils::INPUT_POST),
	'calendar_birthdays_alarm_offset' => $birthdays_alarm_value ?: null,
	'calendar_itip_after_action' => intval(rcube_utils::get_input_value('_after_action', rcube_utils::INPUT_POST)),
	);

	if ($p['prefs']['calendar_itip_after_action'] == 4) {
	$p['prefs']['calendar_itip_after_action'] = rcube_utils::get_input_value('_after_action_folder', rcube_utils::INPUT_POST, true);
	}

	// categories
	if (!$this->driver->nocategories) {
	$old_categories = $new_categories = array();
	foreach ($this->driver->list_categories() as $name => $color) {
	$old_categories[md5($name)] = $name;
	}

	$categories = (array) rcube_utils::get_input_value('_categories', rcube_utils::INPUT_POST);
	$colors = (array) rcube_utils::get_input_value('_colors', rcube_utils::INPUT_POST);

	foreach ($categories as $key => $name) {
	$color = preg_replace('/^#/', '', strval($colors[$key]));

	// rename categories in existing events -> driver's job
	if ($oldname = $old_categories[$key]) {
	$this->driver->replace_category($oldname, $name, $color);
	unset($old_categories[$key]);
	}
	else
	$this->driver->add_category($name, $color);

	$new_categories[$name] = $color;
	}

	// these old categories have been removed, alter events accordingly -> driver's job
	foreach ((array)$old_categories[$key] as $key => $name) {
	$this->driver->remove_category($name);
	}

	$p['prefs']['calendar_categories'] = $new_categories;
	}
	}

	return $p;
	}

	/**
	* Dispatcher for calendar actions initiated by the client
	*/
	function calendar_action()
	{
	$action = rcube_utils::get_input_value('action', rcube_utils::INPUT_GPC);
	$cal = rcube_utils::get_input_value('c', rcube_utils::INPUT_GPC);
	$success = $reload = false;

	if (isset($cal['showalarms']))
	$cal['showalarms'] = intval($cal['showalarms']);

	switch ($action) {
	case "form-new":
	case "form-edit":
	echo $this->ui->calendar_editform($action, $cal);
	exit;
	case "new":
	$success = $this->driver->create_calendar($cal);
	$reload = true;
	break;
	case "edit":
	$success = $this->driver->edit_calendar($cal);
	$reload = true;
	break;
	case "delete":
	if ($success = $this->driver->delete_calendar($cal))
	$this->rc->output->command('plugin.destroy_source', array('id' => $cal['id']));
	break;
	case "subscribe":
	if (!$this->driver->subscribe_calendar($cal))
	$this->rc->output->show_message($this->gettext('errorsaving'), 'error');
	return;
	case "search":
	$results = array();
	$color_mode = $this->rc->config->get('calendar_event_coloring', $this->defaults['calendar_event_coloring']);
	$query = rcube_utils::get_input_value('q', rcube_utils::INPUT_GPC);
	$source = rcube_utils::get_input_value('source', rcube_utils::INPUT_GPC);

	foreach ((array) $this->driver->search_calendars($query, $source) as $id => $prop) {
	$editname = $prop['editname'];
	unset($prop['editname']); // force full name to be displayed
	$prop['active'] = false;

	// let the UI generate HTML and CSS representation for this calendar
	$html = $this->ui->calendar_list_item($id, $prop, $jsenv);
	$cal = $jsenv[$id];
	$cal['editname'] = $editname;
	$cal['html'] = $html;
	if (!empty($prop['color']))
	$cal['css'] = $this->ui->calendar_css_classes($id, $prop, $color_mode);

	$results[] = $cal;
	}
	// report more results available
	if ($this->driver->search_more_results)
	$this->rc->output->show_message('autocompletemore', 'info');

	$this->rc->output->command('multi_thread_http_response', $results, rcube_utils::get_input_value('_reqid', rcube_utils::INPUT_GPC));
	return;
	}

	if ($success)
	$this->rc->output->show_message('successfullysaved', 'confirmation');
	else {
	$error_msg = $this->gettext('errorsaving') . ($this->driver->last_error ? ': ' . $this->driver->last_error :'');
	$this->rc->output->show_message($error_msg, 'error');
	}

	$this->rc->output->command('plugin.unlock_saving');

	if ($success && $reload)
	$this->rc->output->command('plugin.reload_view');
	}


	/**
	* Dispatcher for event actions initiated by the client
	*/
	function event_action()
	{
	$action = rcube_utils::get_input_value('action', rcube_utils::INPUT_GPC);
	$event = rcube_utils::get_input_value('e', rcube_utils::INPUT_POST, true);
	$success = $reload = $got_msg = false;

	// don't notify if modifying a recurring instance (really?)
	if ($event['_savemode'] && in_array($event['_savemode'], array('current','future')) && $event['_notify'] && $action != 'remove')
	unset($event['_notify']);
	// force notify if hidden + active
	else if ((int)$this->rc->config->get('calendar_itip_send_option', $this->defaults['calendar_itip_send_option']) === 1)
	$event['_notify'] = 1;

	// read old event data in order to find changes
	if (($event['_notify'] \|\| $event['decline']) && $action != 'new')
	$old = $this->driver->get_event($event);

	switch ($action) {
	case "new":
	// create UID for new event
	$event['uid'] = $this->generate_uid();
	$this->write_preprocess($event, $action);
	if ($success = $this->driver->new_event($event)) {
	$event['id'] = $event['uid'];
	$this->cleanup_event($event);
	}
	$reload = $success && $event['recurrence'] ? 2 : 1;
	break;

	case "edit":
	$this->write_preprocess($event, $action);
	if ($success = $this->driver->edit_event($event)) {
	$this->cleanup_event($event);
	if ($success !== true) {
	$event['id'] = $success;
	$old = null;
	}
	}
	$reload = $success && ($event['recurrence'] \|\| $event['_savemode'] \|\| $event['_fromcalendar']) ? 2 : 1;
	break;

	case "resize":
	$this->write_preprocess($event, $action);
	if ($success = $this->driver->resize_event($event)) {
	if ($success !== true) {
	$event['id'] = $success;
	$old = null;
	}
	}
	$reload = $event['_savemode'] ? 2 : 1;
	break;

	case "move":
	$this->write_preprocess($event, $action);
	if ($success = $this->driver->move_event($event)) {
	if ($success !== true) {
	$event['id'] = $success;
	$old = null;
	}
	}
	$reload = $success && $event['_savemode'] ? 2 : 1;
	break;

	case "remove":
	// remove previous deletes
	$undo_time = $this->driver->undelete ? $this->rc->config->get('undo_timeout', 0) : 0;
	$this->rc->session->remove('calendar_event_undo');

	// search for event if only UID is given
	if (!isset($event['calendar']) && $event['uid']) {
	if (!($event = $this->driver->get_event($event, true))) {
	break;
	}
	$undo_time = 0;
	}

	$success = $this->driver->remove_event($event, $undo_time < 1);
	$reload = (!$success \|\| $event['_savemode']) ? 2 : 1;

	if ($undo_time > 0 && $success) {
	$_SESSION['calendar_event_undo'] = array('ts' => time(), 'data' => $event);
	// display message with Undo link.
	$msg = html::span(null, $this->gettext('successremoval'))
	. ' ' . html::a(array('onclick' => sprintf("%s.http_request('event', 'action=undo', %s.display_message('', 'loading'))",
	JS_OBJECT_NAME, JS_OBJECT_NAME)), rcube_label('undo'));
	$this->rc->output->show_message($msg, 'confirmation', null, true, $undo_time);
	$got_msg = true;
	}
	else if ($success) {
	$this->rc->output->show_message('calendar.successremoval', 'confirmation');
	$got_msg = true;
	}

	// send iTIP reply that participant has declined the event
	if ($success && $event['decline']) {
	$emails = $this->get_user_emails();
	foreach ($old['attendees'] as $i => $attendee) {
	if ($attendee['role'] == 'ORGANIZER')
	$organizer = $attendee;
	else if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	$old['attendees'][$i]['status'] = 'DECLINED';
	$reply_sender = $attendee['email'];
	}
	}

	$itip = $this->load_itip();
	$itip->set_sender_email($reply_sender);
	if ($organizer && $itip->send_itip_message($old, 'REPLY', $organizer, 'itipsubjectdeclined', 'itipmailbodydeclined'))
	$this->rc->output->command('display_message', $this->gettext(array('name' => 'sentresponseto', 'vars' => array('mailto' => $organizer['name'] ? $organizer['name'] : $organizer['email']))), 'confirmation');
	else
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}
	break;

	case "undo":
	// Restore deleted event
	$event = $_SESSION['calendar_event_undo']['data'];

	if ($event)
	$success = $this->driver->restore_event($event);

	if ($success) {
	$this->rc->session->remove('calendar_event_undo');
	$this->rc->output->show_message('calendar.successrestore', 'confirmation');
	$got_msg = true;
	$reload = 2;
	}

	break;

	case "rsvp":
	$itip_sending = $this->rc->config->get('calendar_itip_send_option', $this->defaults['calendar_itip_send_option']);
	$status = rcube_utils::get_input_value('status', rcube_utils::INPUT_GPC);
	$reply_comment = $event['comment'];

	$ev = $this->driver->get_event($event);
	$ev['attendees'] = $event['attendees'];
	$ev['free_busy'] = $event['free_busy'];

	// send invitation to delegatee + add it as attendee
	if ($status == 'delegated' && $event['to']) {
	$itip = $this->load_itip();
	if ($itip->delegate_to($ev, $event['to'], (bool)$event['rsvp'])) {
	$this->rc->output->show_message('calendar.itipsendsuccess', 'confirmation');
	$noreply = false;
	}
	}

	$event = $ev;

	if ($success = $this->driver->edit_rsvp($event, $status)) {
	$noreply = rcube_utils::get_input_value('noreply', rcube_utils::INPUT_GPC);
	$noreply = intval($noreply) \|\| $status == 'needs-action' \|\| $itip_sending === 0;
	$reload = $event['calendar'] != $ev['calendar'] ? 2 : 1;
	$organizer = null;
	$emails = $this->get_user_emails();

	foreach ($event['attendees'] as $i => $attendee) {
	if ($attendee['role'] == 'ORGANIZER') {
	$organizer = $attendee;
	}
	else if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	$reply_sender = $attendee['email'];
	}
	}

	if (!$noreply) {
	$itip = $this->load_itip();
	$itip->set_sender_email($reply_sender);
	$event['comment'] = $reply_comment;
	if ($organizer && $itip->send_itip_message($event, 'REPLY', $organizer, 'itipsubject' . $status, 'itipmailbody' . $status))
	$this->rc->output->command('display_message', $this->gettext(array('name' => 'sentresponseto', 'vars' => array('mailto' => $organizer['name'] ? $organizer['name'] : $organizer['email']))), 'confirmation');
	else
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}
	}
	break;

	case "dismiss":
	$event['ids'] = explode(',', $event['id']);
	$plugin = $this->rc->plugins->exec_hook('dismiss_alarms', $event);
	$success = $plugin['success'];
	foreach ($event['ids'] as $id) {
	if (strpos($id, 'cal:') === 0)
	$success \|= $this->driver->dismiss_alarm(substr($id, 4), $event['snooze']);
	}
	break;

	case "changelog":
	$data = $this->driver->get_event_changelog($event);
	if (is_array($data) && !empty($data)) {
	$lib = $this->lib;
	array_walk($data, function(&$change) use ($lib) {
	if ($change['date']) {
	$dt = $lib->adjust_timezone($change['date']);
	if ($dt instanceof DateTime)
	$change['date'] = $dt->format('c');
	}
	});
	$this->rc->output->command('plugin.render_event_changelog', $data);
	}
	else {
	$this->rc->output->command('plugin.render_event_changelog', false);
	$this->rc->output->command('display_message', $this->gettext('eventchangelognotavailable'), 'error');
	}
	$got_msg = true;
	$reload = false;
	break;

	case "diff":
	$data = $this->driver->get_event_diff($event, $event['rev']);
	if (is_array($data)) {
	// convert some properties, similar to self::_client_event()
	$lib = $this->lib;
	array_walk($data['changes'], function(&$change, $i) use ($event, $lib) {
	// convert date cols
	foreach (array('start','end','created','changed') as $col) {
	if ($change['property'] == $col) {
	$change['old'] = $lib->adjust_timezone($change['old'], strlen($change['old']) == 10)->format('c');
	$change['new'] = $lib->adjust_timezone($change['new'], strlen($change['new']) == 10)->format('c');
	}
	}
	// create textual representation for alarms and recurrence
	if ($change['property'] == 'alarms') {
	if (is_array($change['old']))
	$change['old_'] = libcalendaring::alarm_text($change['old']);
	if (is_array($change['new']))
	$change['new_'] = libcalendaring::alarm_text(array_merge((array)$change['old'], $change['new']));
	}
	if ($change['property'] == 'recurrence') {
	if (is_array($change['old']))
	$change['old_'] = $lib->recurrence_text($change['old']);
	if (is_array($change['new']))
	$change['new_'] = $lib->recurrence_text(array_merge((array)$change['old'], $change['new']));
	}
	if ($change['property'] == 'attachments') {
	if (is_array($change['old']))
	$change['old']['classname'] = rcube_utils::file2class($change['old']['mimetype'], $change['old']['name']);
	if (is_array($change['new']))
	$change['new']['classname'] = rcube_utils::file2class($change['new']['mimetype'], $change['new']['name']);
	}
	// compute a nice diff of description texts
	if ($change['property'] == 'description') {
	$change['diff_'] = libkolab::html_diff($change['old'], $change['new']);
	}
	});
	$this->rc->output->command('plugin.event_show_diff', $data);
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('eventdiffnotavailable'), 'error');
	}
	$got_msg = true;
	$reload = false;
	break;

	case "show":
	if ($event = $this->driver->get_event_revison($event, $event['rev'])) {
	$this->rc->output->command('plugin.event_show_revision', $this->_client_event($event));
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('eventnotfound'), 'error');
	}
	$got_msg = true;
	$reload = false;
	break;

	case "restore":
	if ($success = $this->driver->restore_event_revision($event, $event['rev'])) {

	}
	else {
	$this->rc->output->command('display_message', 'Not implemented yet', 'error');
	$got_msg = true;
	}
	$reload = false;
	break;
	}

	// show confirmation/error message
	if (!$got_msg) {
	if ($success)
	$this->rc->output->show_message('successfullysaved', 'confirmation');
	else
	$this->rc->output->show_message('calendar.errorsaving', 'error');
	}

	// send out notifications
	if ($success && $event['_notify'] && ($event['attendees'] \|\| $old['attendees'])) {
	// make sure we have the complete record
	$event = $action == 'remove' ? $old : $this->driver->get_event($event);

	// sending notification on a recurrence instance -> re-send the main event
	if ($event['recurrence_id']) {
	$event = $this->driver->get_event(array('id' => $event['recurrence_id'], 'cal' => $event['calendar']));
	$action = 'edit';
	}

	// only notify if data really changed (TODO: do diff check on client already)
	if (!$old \|\| $action == 'remove' \|\| self::event_diff($event, $old)) {
	$sent = $this->notify_attendees($event, $old, $action, $event['_comment']);
	if ($sent > 0)
	$this->rc->output->show_message('calendar.itipsendsuccess', 'confirmation');
	else if ($sent < 0)
	$this->rc->output->show_message('calendar.errornotifying', 'error');
	}
	}

	// unlock client
	$this->rc->output->command('plugin.unlock_saving');

	// update event object on the client or trigger a complete refretch if too complicated
	if ($reload) {
	$args = array('source' => $event['calendar']);
	if ($reload > 1)
	$args['refetch'] = true;
	else if ($success && $action != 'remove')
	$args['update'] = $this->_client_event($this->driver->get_event($event), true);
	$this->rc->output->command('plugin.refresh_calendar', $args);
	}
	}

	/**
	* Handler for load-requests from fullcalendar
	* This will return pure JSON formatted output
	*/
	function load_events()
	{
	$events = $this->driver->load_events(
	rcube_utils::get_input_value('start', rcube_utils::INPUT_GET),
	rcube_utils::get_input_value('end', rcube_utils::INPUT_GET),
	($query = rcube_utils::get_input_value('q', rcube_utils::INPUT_GET)),
	rcube_utils::get_input_value('source', rcube_utils::INPUT_GET)
	);
	echo $this->encode($events, !empty($query));
	exit;
	}

	/**
	* Handler for requests fetching event counts for calendars
	*/
	public function count_events()
	{
	// don't update session on these requests (avoiding race conditions)
	$this->rc->session->nowrite = true;

	$start = rcube_utils::get_input_value('start', rcube_utils::INPUT_GET);
	if (!$start) {
	$start = new DateTime('today 00:00:00', $this->timezone);
	$start = $start->format('U');
	}

	$counts = $this->driver->count_events(
	rcube_utils::get_input_value('source', rcube_utils::INPUT_GET),
	$start,
	rcube_utils::get_input_value('end', rcube_utils::INPUT_GET)
	);

	$this->rc->output->command('plugin.update_counts', array('counts' => $counts));
	}

	/**
	* Load event data from an iTip message attachment
	*/
	public function itip_events($msgref)
	{
	$path = explode('/', $msgref);
	$msg = array_pop($path);
	$mbox = join('/', $path);
	list($uid, $mime_id) = explode('#', $msg);
	$events = array();

	if ($event = $this->lib->mail_get_itip_object($mbox, $uid, $mime_id, 'event')) {
	$partstat = 'NEEDS-ACTION';
	/*
	$user_emails = $this->lib->get_user_emails();
	foreach ($event['attendees'] as $attendee) {
	if (in_array($attendee['email'], $user_emails)) {
	$partstat = $attendee['status'];
	break;
	}
	}
	*/
	$event['id'] = $event['uid'];
	$event['temporary'] = true;
	$event['readonly'] = true;
	$event['calendar'] = '--invitation--itip';
	$event['className'] = 'fc-invitation-' . strtolower($partstat);
	$event['_mbox'] = $mbox;
	$event['_uid'] = $uid;
	$event['_part'] = $mime_id;

	$events[] = $this->_client_event($event, true);
	+
	+ // add recurring instances
	+ if (!empty($event['recurrence'])) {
	+ foreach ($this->driver->get_recurring_events($event, $event['start']) as $recurring) {
	+ $events[] = $this->_client_event($recurring, true);
	+ }
	+ }
	}

	return $events;
	}

	/**
	* Handler for keep-alive requests
	* This will check for updated data in active calendars and sync them to the client
	*/
	public function refresh($attr)
	{
	// refresh the entire calendar every 10th time to also sync deleted events
	if (rand(0,10) == 10) {
	$this->rc->output->command('plugin.refresh_calendar', array('refetch' => true));
	return;
	}

	$counts = array();

	foreach ($this->driver->list_calendars(true) as $cal) {
	$events = $this->driver->load_events(
	rcube_utils::get_input_value('start', rcube_utils::INPUT_GPC),
	rcube_utils::get_input_value('end', rcube_utils::INPUT_GPC),
	rcube_utils::get_input_value('q', rcube_utils::INPUT_GPC),
	$cal['id'],
	1,
	$attr['last']
	);

	foreach ($events as $event) {
	$this->rc->output->command('plugin.refresh_calendar',
	array('source' => $cal['id'], 'update' => $this->_client_event($event)));
	}

	// refresh count for this calendar
	if ($cal['counts']) {
	$today = new DateTime('today 00:00:00', $this->timezone);
	$counts += $this->driver->count_events($cal['id'], $today->format('U'));
	}
	}

	if (!empty($counts)) {
	$this->rc->output->command('plugin.update_counts', array('counts' => $counts));
	}
	}

	/**
	* Handler for pending_alarms plugin hook triggered by the calendar module on keep-alive requests.
	* This will check for pending notifications and pass them to the client
	*/
	public function pending_alarms($p)
	{
	$this->load_driver();
	$time = $p['time'] ?: time();
	if ($alarms = $this->driver->pending_alarms($time)) {
	foreach ($alarms as $alarm) {
	$alarm['id'] = 'cal:' . $alarm['id']; // prefix ID with cal:
	$p['alarms'][] = $alarm;
	}
	}

	// get alarms for birthdays calendar
	if ($this->rc->config->get('calendar_contact_birthdays') && $this->rc->config->get('calendar_birthdays_alarm_type') == 'DISPLAY') {
	$cache = $this->rc->get_cache('calendar.birthdayalarms', 'db');

	foreach ($this->driver->load_birthday_events($time, $time + 86400 * 60) as $e) {
	$alarm = libcalendaring::get_next_alarm($e);

	// overwrite alarm time with snooze value (or null if dismissed)
	if ($dismissed = $cache->get($e['id']))
	$alarm['time'] = $dismissed['notifyat'];

	// add to list if alarm is set
	if ($alarm && $alarm['time'] && $alarm['time'] <= $time) {
	$e['id'] = 'cal:bday:' . $e['id'];
	$e['notifyat'] = $alarm['time'];
	$p['alarms'][] = $e;
	}
	}
	}

	return $p;
	}

	/**
	* Handler for alarm dismiss hook triggered by libcalendaring
	*/
	public function dismiss_alarms($p)
	{
	$this->load_driver();
	foreach ((array)$p['ids'] as $id) {
	if (strpos($id, 'cal:bday:') === 0) {
	$p['success'] \|= $this->driver->dismiss_birthday_alarm(substr($id, 9), $p['snooze']);
	}
	else if (strpos($id, 'cal:') === 0) {
	$p['success'] \|= $this->driver->dismiss_alarm(substr($id, 4), $p['snooze']);
	}
	}

	return $p;
	}

	/**
	* Handler for check-recent requests which are accidentally sent to calendar taks
	*/
	function check_recent()
	{
	// NOP
	$this->rc->output->send();
	}

	/**
	* Hook triggered when a contact is saved
	*/
	function contact_update($p)
	{
	// clear birthdays calendar cache
	if (!empty($p['record']['birthday'])) {
	$cache = $this->rc->get_cache('calendar.birthdays', 'db');
	$cache->remove();
	}
	}

	/**
	*
	*/
	function import_events()
	{
	// Upload progress update
	if (!empty($_GET['_progress'])) {
	rcube_upload_progress();
	}

	@set_time_limit(0);

	// process uploaded file if there is no error
	$err = $_FILES['_data']['error'];

	if (!$err && $_FILES['_data']['tmp_name']) {
	$calendar = rcube_utils::get_input_value('calendar', rcube_utils::INPUT_GPC);
	$rangestart = $_REQUEST['_range'] ? date_create("now -" . intval($_REQUEST['_range']) . " months") : 0;

	// extract zip file
	if ($_FILES['_data']['type'] == 'application/zip') {
	$count = 0;
	if (class_exists('ZipArchive', false)) {
	$zip = new ZipArchive();
	if ($zip->open($_FILES['_data']['tmp_name'])) {
	$randname = uniqid('zip-' . session_id(), true);
	$tmpdir = slashify($this->rc->config->get('temp_dir', sys_get_temp_dir())) . $randname;
	mkdir($tmpdir, 0700);

	// extract each ical file from the archive and import it
	for ($i = 0; $i < $zip->numFiles; $i++) {
	$filename = $zip->getNameIndex($i);
	if (preg_match('/\.ics$/i', $filename)) {
	$tmpfile = $tmpdir . '/' . basename($filename);
	if (copy('zip://' . $_FILES['_data']['tmp_name'] . '#'.$filename, $tmpfile)) {
	$count += $this->import_from_file($tmpfile, $calendar, $rangestart, $errors);
	unlink($tmpfile);
	}
	}
	}

	rmdir($tmpdir);
	$zip->close();
	}
	else {
	$errors = 1;
	$msg = 'Failed to open zip file.';
	}
	}
	else {
	$errors = 1;
	$msg = 'Zip files are not supported for import.';
	}
	}
	else {
	// attempt to import teh uploaded file directly
	$count = $this->import_from_file($_FILES['_data']['tmp_name'], $calendar, $rangestart, $errors);
	}

	if ($count) {
	$this->rc->output->command('display_message', $this->gettext(array('name' => 'importsuccess', 'vars' => array('nr' => $count))), 'confirmation');
	$this->rc->output->command('plugin.import_success', array('source' => $calendar, 'refetch' => true));
	}
	else if (!$errors) {
	$this->rc->output->command('display_message', $this->gettext('importnone'), 'notice');
	$this->rc->output->command('plugin.import_success', array('source' => $calendar));
	}
	else {
	$this->rc->output->command('plugin.import_error', array('message' => $this->gettext('importerror') . ($msg ? ': ' . $msg : '')));
	}
	}
	else {
	if ($err == UPLOAD_ERR_INI_SIZE \|\| $err == UPLOAD_ERR_FORM_SIZE) {
	$msg = rcube_label(array('name' => 'filesizeerror', 'vars' => array(
	'size' => show_bytes(parse_bytes(ini_get('upload_max_filesize'))))));
	}
	else {
	$msg = rcube_label('fileuploaderror');
	}

	$this->rc->output->command('plugin.import_error', array('message' => $msg));
	}

	$this->rc->output->send('iframe');
	}

	/**
	* Helper function to parse and import a single .ics file
	*/
	private function import_from_file($filepath, $calendar, $rangestart, &$errors)
	{
	$user_email = $this->rc->user->get_username();

	$ical = $this->get_ical();
	$errors = !$ical->fopen($filepath);
	$count = $i = 0;
	foreach ($ical as $event) {
	// keep the browser connection alive on long import jobs
	if (++$i > 100 && $i % 100 == 0) {
	echo "<!-- -->";
	ob_flush();
	}

	// TODO: correctly handle recurring events which start before $rangestart
	if ($event['end'] < $rangestart && (!$event['recurrence'] \|\| ($event['recurrence']['until'] && $event['recurrence']['until'] < $rangestart)))
	continue;

	$event['_owner'] = $user_email;
	$event['calendar'] = $calendar;
	if ($this->driver->new_event($event)) {
	$count++;
	}
	else {
	$errors++;
	}
	}

	return $count;
	}


	/**
	* Construct the ics file for exporting events to iCalendar format;
	*/
	function export_events($terminate = true)
	{
	$start = rcube_utils::get_input_value('start', rcube_utils::INPUT_GET);
	$end = rcube_utils::get_input_value('end', rcube_utils::INPUT_GET);

	if (!isset($start))
	$start = 'today -1 year';
	if (!is_numeric($start))
	$start = strtotime($start . ' 00:00:00');
	if (!$end)
	$end = 'today +10 years';
	if (!is_numeric($end))
	$end = strtotime($end . ' 23:59:59');

	$event_id = rcube_utils::get_input_value('id', rcube_utils::INPUT_GET);
	$attachments = rcube_utils::get_input_value('attachments', rcube_utils::INPUT_GET);
	$calid = $filename = rcube_utils::get_input_value('source', rcube_utils::INPUT_GET);

	$calendars = $this->driver->list_calendars();
	$events = array();

	if ($calendars[$calid]) {
	$filename = $calendars[$calid]['name'] ? $calendars[$calid]['name'] : $calid;
	$filename = asciiwords(html_entity_decode($filename)); // to 7bit ascii
	if (!empty($event_id)) {
	if ($event = $this->driver->get_event(array('calendar' => $calid, 'id' => $event_id))) {
	$events = array($event);
	$filename = asciiwords($event['title']);
	if (empty($filename))
	$filename = 'event';
	}
	}
	else {
	$events = $this->driver->load_events($start, $end, null, $calid, 0);
	if (empty($filename))
	$filename = $calid;
	}
	}

	header("Content-Type: text/calendar");
	header("Content-Disposition: inline; filename=".$filename.'.ics');

	$this->get_ical()->export($events, '', true, $attachments ? array($this->driver, 'get_attachment_body') : null);

	if ($terminate)
	exit;
	}


	/**
	* Handler for iCal feed requests
	*/
	function ical_feed_export()
	{
	$session_exists = !empty($_SESSION['user_id']);

	// process HTTP auth info
	if (!empty($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
	$_POST['_user'] = $_SERVER['PHP_AUTH_USER']; // used for rcmail::autoselect_host()
	$auth = $this->rc->plugins->exec_hook('authenticate', array(
	'host' => $this->rc->autoselect_host(),
	'user' => trim($_SERVER['PHP_AUTH_USER']),
	'pass' => $_SERVER['PHP_AUTH_PW'],
	'cookiecheck' => true,
	'valid' => true,
	));
	if ($auth['valid'] && !$auth['abort'])
	$this->rc->login($auth['user'], $auth['pass'], $auth['host']);
	}

	// require HTTP auth
	if (empty($_SESSION['user_id'])) {
	header('WWW-Authenticate: Basic realm="Roundcube Calendar"');
	header('HTTP/1.0 401 Unauthorized');
	exit;
	}

	// decode calendar feed hash
	$format = 'ics';
	$calhash = rcube_utils::get_input_value('_cal', rcube_utils::INPUT_GET);
	if (preg_match(($suff_regex = '/\.([a-z0-9]{3,5})$/i'), $calhash, $m)) {
	$format = strtolower($m[1]);
	$calhash = preg_replace($suff_regex, '', $calhash);
	}

	if (!strpos($calhash, ':'))
	$calhash = base64_decode($calhash);

	list($user, $_GET['source']) = explode(':', $calhash, 2);

	// sanity check user
	if ($this->rc->user->get_username() == $user) {
	$this->load_driver();
	$this->export_events(false);
	}
	else {
	header('HTTP/1.0 404 Not Found');
	}

	// don't save session data
	if (!$session_exists)
	session_destroy();
	exit;
	}


	/**
	*
	*/
	function load_settings()
	{
	$this->lib->load_settings();
	$this->defaults += $this->lib->defaults;

	$settings = array();

	// configuration
	$settings['default_calendar'] = $this->rc->config->get('calendar_default_calendar');
	$settings['default_view'] = (string)$this->rc->config->get('calendar_default_view', $this->defaults['calendar_default_view']);
	$settings['date_agenda'] = (string)$this->rc->config->get('calendar_date_agenda', $this->defaults['calendar_date_agenda']);

	$settings['timeslots'] = (int)$this->rc->config->get('calendar_timeslots', $this->defaults['calendar_timeslots']);
	$settings['first_day'] = (int)$this->rc->config->get('calendar_first_day', $this->defaults['calendar_first_day']);
	$settings['first_hour'] = (int)$this->rc->config->get('calendar_first_hour', $this->defaults['calendar_first_hour']);
	$settings['work_start'] = (int)$this->rc->config->get('calendar_work_start', $this->defaults['calendar_work_start']);
	$settings['work_end'] = (int)$this->rc->config->get('calendar_work_end', $this->defaults['calendar_work_end']);
	$settings['agenda_range'] = (int)$this->rc->config->get('calendar_agenda_range', $this->defaults['calendar_agenda_range']);
	$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']);
	$settings['invitation_calendars'] = (bool)$this->rc->config->get('kolab_invitation_calendars', false);
	$settings['itip_notify'] = (int)$this->rc->config->get('calendar_itip_send_option', $this->defaults['calendar_itip_send_option']);

	// get user identity to create default attendee
	if ($this->ui->screen == 'calendar') {
	foreach ($this->rc->user->list_emails() as $rec) {
	if (!$identity)
	$identity = $rec;
	$identity['emails'][] = $rec['email'];
	$settings['identities'][$rec['identity_id']] = $rec['email'];
	}
	$identity['emails'][] = $this->rc->user->get_username();
	$settings['identity'] = array('name' => $identity['name'], 'email' => strtolower($identity['email']), 'emails' => ';' . strtolower(join(';', $identity['emails'])));
	}

	return $settings;
	}

	/**
	* Encode events as JSON
	*
	* @param array Events as array
	* @param boolean Add CSS class names according to calendar and categories
	* @return string JSON encoded events
	*/
	function encode($events, $addcss = false)
	{
	$json = array();
	foreach ($events as $event) {
	$json[] = $this->_client_event($event, $addcss);
	}
	return json_encode($json);
	}

	/**
	* Convert an event object to be used on the client
	*/
	private function _client_event($event, $addcss = false)
	{
	// compose a human readable strings for alarms_text and recurrence_text
	if ($event['valarms']) {
	$event['alarms_text'] = libcalendaring::alarms_text($event['valarms']);
	$event['valarms'] = libcalendaring::to_client_alarms($event['valarms']);
	}
	if ($event['recurrence']) {
	$event['recurrence_text'] = $this->lib->recurrence_text($event['recurrence']);
	$event['recurrence'] = $this->lib->to_client_recurrence($event['recurrence'], $event['allday']);
	}

	foreach ((array)$event['attachments'] as $k => $attachment) {
	$event['attachments'][$k]['classname'] = rcube_utils::file2class($attachment['mimetype'], $attachment['name']);
	}

	// convert link URIs references into structs
	if (array_key_exists('links', $event)) {
	foreach ((array)$event['links'] as $i => $link) {
	if (strpos($link, 'imap://') === 0 && ($msgref = $this->driver->get_message_reference($link))) {
	$event['links'][$i] = $msgref;
	}
	}
	}

	// check for organizer in attendees list
	$organizer = null;
	foreach ((array)$event['attendees'] as $i => $attendee) {
	if ($attendee['role'] == 'ORGANIZER') {
	$organizer = $attendee;
	}
	if ($attendee['status'] == 'DELEGATED' && $attendee['rsvp'] == false) {
	$event['attendees'][$i]['noreply'] = true;
	}
	}

	if ($organizer === null && !empty($event['organizer'])) {
	$organizer = $event['organizer'];
	$organizer['role'] = 'ORGANIZER';
	if (!is_array($event['attendees']))
	$event['attendees'] = array();
	array_unshift($event['attendees'], $organizer);
	}

	// mapping url => vurl because of the fullcalendar client script
	$event['vurl'] = $event['url'];
	unset($event['url']);

	return array(
	'_id' => $event['calendar'] . ':' . $event['id'], // unique identifier for fullcalendar
	'start' => $this->lib->adjust_timezone($event['start'], $event['allday'])->format('c'),
	'end' => $this->lib->adjust_timezone($event['end'], $event['allday'])->format('c'),
	// 'changed' might be empty for event recurrences (Bug #2185)
	'changed' => $event['changed'] ? $this->lib->adjust_timezone($event['changed'])->format('c') : null,
	'created' => $event['created'] ? $this->lib->adjust_timezone($event['created'])->format('c') : null,
	'title' => strval($event['title']),
	'description' => strval($event['description']),
	'location' => strval($event['location']),
	'className' => ($addcss ? 'fc-event-cal-'.asciiwords($event['calendar'], true).' ' : '') .
	'fc-event-cat-' . asciiwords(strtolower(join('-', (array)$event['categories'])), true) .
	rtrim(' ' . $event['className']),
	'allDay' => ($event['allday'] == 1),
	) + $event;
	}


	/**
	* Generate a unique identifier for an event
	*/
	public function generate_uid()
	{
	return strtoupper(md5(time() . uniqid(rand())) . '-' . substr(md5($this->rc->user->get_username()), 0, 16));
	}


	/**
	* TEMPORARY: generate random event data for testing
	* Create events by opening http://<roundcubeurl>/?_task=calendar&_action=randomdata&_num=500&_date=2014-08-01&_dev=120
	*/
	public function generate_randomdata()
	{
	@set_time_limit(0);

	$num = $_REQUEST['_num'] ? intval($_REQUEST['_num']) : 100;
	$date = $_REQUEST['_date'] ?: 'now';
	$dev = $_REQUEST['_dev'] ?: 30;
	$cats = array_keys($this->driver->list_categories());
	$cals = $this->driver->list_calendars(true);
	$count = 0;

	while ($count++ < $num) {
	$spread = intval($dev) * 86400; // days
	$refdate = strtotime($date);
	$start = round(($refdate + rand(-$spread, $spread)) / 600) * 600;
	$duration = round(rand(30, 360) / 30) * 30 * 60;
	$allday = rand(0,20) > 18;
	$alarm = rand(-30,12) * 5;
	$fb = rand(0,2);

	if (date('G', $start) > 23)
	$start -= 3600;

	if ($allday) {
	$start = strtotime(date('Y-m-d 00:00:00', $start));
	$duration = 86399;
	}

	$title = '';
	$len = rand(2, 12);
	$words = explode(" ", "The Hough transform is named after Paul Hough who patented the method in 1962. It is a technique which can be used to isolate features of a particular shape within an image. Because it requires that the desired features be specified in some parametric form, the classical Hough transform is most commonly used for the de- tection of regular curves such as lines, circles, ellipses, etc. A generalized Hough transform can be employed in applications where a simple analytic description of a feature(s) is not possible. Due to the computational complexity of the generalized Hough algorithm, we restrict the main focus of this discussion to the classical Hough transform. Despite its domain restrictions, the classical Hough transform (hereafter referred to without the classical prefix ) retains many applications, as most manufac- tured parts (and many anatomical parts investigated in medical imagery) contain feature boundaries which can be described by regular curves. The main advantage of the Hough transform technique is that it is tolerant of gaps in feature boundary descriptions and is relatively unaffected by image noise.");
	// $chars = "!# abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ 1234567890";
	for ($i = 0; $i < $len; $i++)
	$title .= $words[rand(0,count($words)-1)] . " ";

	$this->driver->new_event(array(
	'uid' => $this->generate_uid(),
	'start' => new DateTime('@'.$start),
	'end' => new DateTime('@'.($start + $duration)),
	'allday' => $allday,
	'title' => rtrim($title),
	'free_busy' => $fb == 2 ? 'outofoffice' : ($fb ? 'busy' : 'free'),
	'categories' => $cats[array_rand($cats)],
	'calendar' => array_rand($cals),
	'alarms' => $alarm > 0 ? "-{$alarm}M:DISPLAY" : '',
	'priority' => rand(0,9),
	));
	}

	$this->rc->output->redirect('');
	}

	/**
	* Handler for attachments upload
	*/
	public function attachment_upload()
	{
	$this->lib->attachment_upload(self::SESSION_KEY, 'cal-');
	}

	/**
	* Handler for attachments download/displaying
	*/
	public function attachment_get()
	{
	// show loading page
	if (!empty($_GET['_preload'])) {
	return $this->lib->attachment_loading_page();
	}

	$event_id = rcube_utils::get_input_value('_event', rcube_utils::INPUT_GPC);
	$calendar = rcube_utils::get_input_value('_cal', rcube_utils::INPUT_GPC);
	$id = rcube_utils::get_input_value('_id', rcube_utils::INPUT_GPC);

	$event = array('id' => $event_id, 'calendar' => $calendar);
	$attachment = $this->driver->get_attachment($id, $event);

	// show part page
	if (!empty($_GET['_frame'])) {
	$this->lib->attachment = $attachment;
	$this->register_handler('plugin.attachmentframe', array($this->lib, 'attachment_frame'));
	$this->register_handler('plugin.attachmentcontrols', array($this->lib, 'attachment_header'));
	$this->rc->output->send('calendar.attachment');
	}
	// deliver attachment content
	else if ($attachment) {
	$attachment['body'] = $this->driver->get_attachment_body($id, $event);
	$this->lib->attachment_get($attachment);
	}

	// if we arrive here, the requested part was not found
	header('HTTP/1.1 404 Not Found');
	exit;
	}


	/**
	* Prepares new/edited event properties before save
	*/
	private function write_preprocess(&$event, $action)
	{
	// convert dates into DateTime objects in user's current timezone
	$event['start'] = new DateTime($event['start'], $this->timezone);
	$event['end'] = new DateTime($event['end'], $this->timezone);

	// start/end is all we need for 'move' action (#1480)
	if ($action == 'move') {
	return;
	}

	// convert the submitted recurrence settings
	if (is_array($event['recurrence'])) {
	$event['recurrence'] = $this->lib->from_client_recurrence($event['recurrence'], $event['start']);
	}

	// convert the submitted alarm values
	if ($event['valarms']) {
	$event['valarms'] = libcalendaring::from_client_alarms($event['valarms']);
	}

	$attachments = array();
	$eventid = 'cal-'.$event['id'];

	if (is_array($_SESSION[self::SESSION_KEY]) && $_SESSION[self::SESSION_KEY]['id'] == $eventid) {
	if (!empty($_SESSION[self::SESSION_KEY]['attachments'])) {
	foreach ($_SESSION[self::SESSION_KEY]['attachments'] as $id => $attachment) {
	if (is_array($event['attachments']) && in_array($id, $event['attachments'])) {
	$attachments[$id] = $this->rc->plugins->exec_hook('attachment_get', $attachment);
	}
	}
	}
	}

	$event['attachments'] = $attachments;

	// convert link references into simple URIs
	if (array_key_exists('links', $event)) {
	$event['links'] = array_map(function($link) {
	return is_array($link) ? $link['uri'] : strval($link);
	}, (array)$event['links']);
	}

	// check for organizer in attendees
	if ($action == 'new' \|\| $action == 'edit') {
	if (!$event['attendees'])
	$event['attendees'] = array();

	$emails = $this->get_user_emails();
	$organizer = $owner = false;
	foreach ((array)$event['attendees'] as $i => $attendee) {
	if ($attendee['role'] == 'ORGANIZER')
	$organizer = $i;
	if ($attendee['email'] == in_array(strtolower($attendee['email']), $emails))
	$owner = $i;
	else if (!isset($attendee['rsvp']))
	$event['attendees'][$i]['rsvp'] = true;
	else if (is_string($attendee['rsvp']))
	$event['attendees'][$i]['rsvp'] = $attendee['rsvp'] == 'true' \|\| $attendee['rsvp'] == '1';
	}

	// set new organizer identity
	if ($organizer !== false && !empty($event['_identity']) && ($identity = $this->rc->user->get_identity($event['_identity']))) {
	$event['attendees'][$organizer]['name'] = $identity['name'];
	$event['attendees'][$organizer]['email'] = $identity['email'];
	}

	// set owner as organizer if yet missing
	if ($organizer === false && $owner !== false) {
	$event['attendees'][$owner]['role'] = 'ORGANIZER';
	unset($event['attendees'][$owner]['rsvp']);
	}
	else if ($organizer === false && $action == 'new' && ($identity = $this->rc->user->get_identity($event['_identity'])) && $identity['email']) {
	array_unshift($event['attendees'], array('role' => 'ORGANIZER', 'name' => $identity['name'], 'email' => $identity['email'], 'status' => 'ACCEPTED'));
	}
	}

	// mapping url => vurl because of the fullcalendar client script
	if (array_key_exists('vurl', $event)) {
	$event['url'] = $event['vurl'];
	unset($event['vurl']);
	}
	}

	/**
	* Releases some resources after successful event save
	*/
	private function cleanup_event(&$event)
	{
	// remove temp. attachment files
	if (!empty($_SESSION[self::SESSION_KEY]) && ($eventid = $_SESSION[self::SESSION_KEY]['id'])) {
	$this->rc->plugins->exec_hook('attachments_cleanup', array('group' => $eventid));
	$this->rc->session->remove(self::SESSION_KEY);
	}
	}

	/**
	* Send out an invitation/notification to all event attendees
	*/
	private function notify_attendees($event, $old, $action = 'edit', $comment = null)
	{
	if ($action == 'remove' \|\| ($event['status'] == 'CANCELLED' && $old['status'] != $event['status'])) {
	$event['cancelled'] = true;
	$is_cancelled = true;
	}

	$itip = $this->load_itip();
	$emails = $this->get_user_emails();
	$itip_notify = (int)$this->rc->config->get('calendar_itip_send_option', $this->defaults['calendar_itip_send_option']);

	// add comment to the iTip attachment
	$event['comment'] = $comment;

	// compose multipart message using PEAR:Mail_Mime
	$method = $action == 'remove' ? 'CANCEL' : 'REQUEST';
	$message = $itip->compose_itip_message($event, $method, $event['sequence'] > $old['sequence']);

	// list existing attendees from $old event
	$old_attendees = array();
	foreach ((array)$old['attendees'] as $attendee) {
	$old_attendees[] = $attendee['email'];
	}

	// send to every attendee
	$sent = 0; $current = array();
	foreach ((array)$event['attendees'] as $attendee) {
	$current[] = strtolower($attendee['email']);

	// skip myself for obvious reasons
	if (!$attendee['email'] \|\| in_array(strtolower($attendee['email']), $emails))
	continue;

	// skip if notification is disabled for this attendee
	if ($attendee['noreply'] && $itip_notify & 2)
	continue;

	// skip if this attendee has delegated and set RSVP=FALSE
	if ($attendee['status'] == 'DELEGATED' && $attendee['rsvp'] === false)
	continue;

	// which template to use for mail text
	$is_new = !in_array($attendee['email'], $old_attendees);
	$is_rsvp = $is_new \|\| $event['sequence'] > $old['sequence'];
	$bodytext = $is_cancelled ? 'eventcancelmailbody' : ($is_new ? 'invitationmailbody' : 'eventupdatemailbody');
	$subject = $is_cancelled ? 'eventcancelsubject' : ($is_new ? 'invitationsubject' : ($event['title'] ? 'eventupdatesubject':'eventupdatesubjectempty'));

	$event['comment'] = $comment;

	// finally send the message
	if ($itip->send_itip_message($event, $method, $attendee, $subject, $bodytext, $message, $is_rsvp))
	$sent++;
	else
	$sent = -100;
	}

	// send CANCEL message to removed attendees
	foreach ((array)$old['attendees'] as $attendee) {
	if ($attendee['ROLE'] == 'ORGANIZER' \|\| !$attendee['email'] \|\| in_array(strtolower($attendee['email']), $current))
	continue;

	$vevent = $old;
	$vevent['cancelled'] = $is_cancelled;
	$vevent['attendees'] = array($attendee);
	$vevent['comment'] = $comment;
	if ($itip->send_itip_message($vevent, 'CANCEL', $attendee, 'eventcancelsubject', 'eventcancelmailbody'))
	$sent++;
	else
	$sent = -100;
	}

	return $sent;
	}

	/**
	* Echo simple free/busy status text for the given user and time range
	*/
	public function freebusy_status()
	{
	$email = rcube_utils::get_input_value('email', rcube_utils::INPUT_GPC);
	$start = rcube_utils::get_input_value('start', rcube_utils::INPUT_GPC);
	$end = rcube_utils::get_input_value('end', rcube_utils::INPUT_GPC);

	// convert dates into unix timestamps
	if (!empty($start) && !is_numeric($start)) {
	$dts = new DateTime($start, $this->timezone);
	$start = $dts->format('U');
	}
	if (!empty($end) && !is_numeric($end)) {
	$dte = new DateTime($end, $this->timezone);
	$end = $dte->format('U');
	}

	if (!$start) $start = time();
	if (!$end) $end = $start + 3600;

	$fbtypemap = array(calendar::FREEBUSY_UNKNOWN => 'UNKNOWN', calendar::FREEBUSY_FREE => 'FREE', calendar::FREEBUSY_BUSY => 'BUSY', calendar::FREEBUSY_TENTATIVE => 'TENTATIVE', calendar::FREEBUSY_OOF => 'OUT-OF-OFFICE');
	$status = 'UNKNOWN';

	// if the backend has free-busy information
	$fblist = $this->driver->get_freebusy_list($email, $start, $end);
	if (is_array($fblist)) {
	$status = 'FREE';

	foreach ($fblist as $slot) {
	list($from, $to, $type) = $slot;
	if ($from < $end && $to > $start) {
	$status = isset($type) && $fbtypemap[$type] ? $fbtypemap[$type] : 'BUSY';
	break;
	}
	}
	}

	// let this information be cached for 5min
	send_future_expire_header(300);

	echo $status;
	exit;
	}

	/**
	* Return a list of free/busy time slots within the given period
	* Echo data in JSON encoding
	*/
	public function freebusy_times()
	{
	$email = rcube_utils::get_input_value('email', rcube_utils::INPUT_GPC);
	$start = rcube_utils::get_input_value('start', rcube_utils::INPUT_GPC);
	$end = rcube_utils::get_input_value('end', rcube_utils::INPUT_GPC);
	$interval = intval(rcube_utils::get_input_value('interval', rcube_utils::INPUT_GPC));
	$strformat = $interval > 60 ? 'Ymd' : 'YmdHis';

	// convert dates into unix timestamps
	if (!empty($start) && !is_numeric($start)) {
	$dts = rcube_utils::anytodatetime($start, $this->timezone);
	$start = $dts ? $dts->format('U') : null;
	}
	if (!empty($end) && !is_numeric($end)) {
	$dte = rcube_utils::anytodatetime($end, $this->timezone);
	$end = $dte ? $dte->format('U') : null;
	}

	if (!$start) $start = time();
	if (!$end) $end = $start + 86400 * 30;
	if (!$interval) $interval = 60; // 1 hour

	if (!$dte) {
	$dts = new DateTime('@'.$start);
	$dts->setTimezone($this->timezone);
	}

	$fblist = $this->driver->get_freebusy_list($email, $start, $end);
	$slots = array();

	// build a list from $start till $end with blocks representing the fb-status
	for ($s = 0, $t = $start; $t <= $end; $s++) {
	$status = self::FREEBUSY_UNKNOWN;
	$t_end = $t + $interval * 60;
	$dt = new DateTime('@'.$t);
	$dt->setTimezone($this->timezone);

	// determine attendee's status
	if (is_array($fblist)) {
	$status = self::FREEBUSY_FREE;
	foreach ($fblist as $slot) {
	list($from, $to, $type) = $slot;

	// check for possible all-day times
	if (gmdate('His', $from) == '000000' && gmdate('His', $to) == '235959') {
	// shift into the user's timezone for sane matching
	$from -= $this->gmt_offset;
	$to -= $this->gmt_offset;
	}

	if ($from < $t_end && $to > $t) {
	$status = isset($type) ? $type : self::FREEBUSY_BUSY;
	if ($status == self::FREEBUSY_BUSY) // can't get any worse :-)
	break;
	}
	}
	}

	$slots[$s] = $status;
	$times[$s] = intval($dt->format($strformat));
	$t = $t_end;
	}

	$dte = new DateTime('@'.$t_end);
	$dte->setTimezone($this->timezone);

	// let this information be cached for 5min
	send_future_expire_header(300);

	echo json_encode(array(
	'email' => $email,
	'start' => $dts->format('c'),
	'end' => $dte->format('c'),
	'interval' => $interval,
	'slots' => $slots,
	'times' => $times,
	));
	exit;
	}

	/**
	* Handler for printing calendars
	*/
	public function print_view()
	{
	$title = $this->gettext('print');

	$view = rcube_utils::get_input_value('view', rcube_utils::INPUT_GPC);
	if (!in_array($view, array('agendaWeek', 'agendaDay', 'month', 'table')))
	$view = 'agendaDay';

	$this->rc->output->set_env('view',$view);

	if ($date = rcube_utils::get_input_value('date', rcube_utils::INPUT_GPC))
	$this->rc->output->set_env('date', $date);

	if ($range = rcube_utils::get_input_value('range', rcube_utils::INPUT_GPC))
	$this->rc->output->set_env('listRange', intval($range));

	if (isset($_REQUEST['sections']))
	$this->rc->output->set_env('listSections', rcube_utils::get_input_value('sections', rcube_utils::INPUT_GPC));

	if ($search = rcube_utils::get_input_value('search', rcube_utils::INPUT_GPC)) {
	$this->rc->output->set_env('search', $search);
	$title .= ' "' . $search . '"';
	}

	// Add CSS stylesheets to the page header
	$skin_path = $this->local_skin_path();
	$this->include_stylesheet($skin_path . '/fullcalendar.css');
	$this->include_stylesheet($skin_path . '/print.css');

	// Add JS files to the page header
	$this->include_script('print.js');
	$this->include_script('lib/js/fullcalendar.js');

	$this->register_handler('plugin.calendar_css', array($this->ui, 'calendar_css'));
	$this->register_handler('plugin.calendar_list', array($this->ui, 'calendar_list'));

	$this->rc->output->set_pagetitle($title);
	$this->rc->output->send("calendar.print");
	}

	/**
	*
	*/
	public function get_inline_ui()
	{
	foreach (array('save','cancel','savingdata') as $label)
	$texts['calendar.'.$label] = $this->gettext($label);

	$texts['calendar.new_event'] = $this->gettext('createfrommail');

	$this->ui->init_templates();
	$this->ui->calendar_list(); # set env['calendars']
	echo $this->api->output->parse('calendar.eventedit', false, false);
	echo html::tag('script', array('type' => 'text/javascript'),
	"rcmail.set_env('calendars', " . json_encode($this->api->output->env['calendars']) . ");\n".
	"rcmail.set_env('deleteicon', '" . $this->api->output->env['deleteicon'] . "');\n".
	"rcmail.set_env('cancelicon', '" . $this->api->output->env['cancelicon'] . "');\n".
	"rcmail.set_env('loadingicon', '" . $this->api->output->env['loadingicon'] . "');\n".
	"rcmail.gui_object('attachmentlist', '" . $this->ui->attachmentlist_id . "');\n".
	"rcmail.add_label(" . json_encode($texts) . ");\n"
	);
	exit;
	}

	/**
	* Compare two event objects and return differing properties
	*
	* @param array Event A
	* @param array Event B
	* @return array List of differing event properties
	*/
	public static function event_diff($a, $b)
	{
	$diff = array();
	$ignore = array('changed' => 1, 'attachments' => 1);
	foreach (array_unique(array_merge(array_keys($a), array_keys($b))) as $key) {
	if (!$ignore[$key] && $a[$key] != $b[$key])
	$diff[] = $key;
	}

	// only compare number of attachments
	if (count($a['attachments']) != count($b['attachments']))
	$diff[] = 'attachments';

	return $diff;
	}


	/** Resource management functions **/

	/**
	* Getter for the configured implementation of the resource directory interface
	*/
	private function resources_directory()
	{
	if (is_object($this->resources_dir)) {
	return $this->resources_dir;
	}

	if ($driver_name = $this->rc->config->get('calendar_resources_driver')) {
	$driver_class = 'resources_driver_' . $driver_name;

	require_once($this->home . '/drivers/resources_driver.php');
	require_once($this->home . '/drivers/' . $driver_name . '/' . $driver_class . '.php');

	$this->resources_dir = new $driver_class($this);
	}

	return $this->resources_dir;
	}

	/**
	* Handler for resoruce autocompletion requests
	*/
	public function resources_autocomplete()
	{
	$search = rcube_utils::get_input_value('_search', rcube_utils::INPUT_GPC, true);
	$sid = rcube_utils::get_input_value('_reqid', rcube_utils::INPUT_GPC);
	$maxnum = (int)$this->rc->config->get('autocomplete_max', 15);
	$results = array();

	if ($directory = $this->resources_directory()) {
	foreach ($directory->load_resources($search, $maxnum) as $rec) {
	$results[] = array(
	'name' => $rec['name'],
	'email' => $rec['email'],
	'type' => $rec['_type'],
	);
	}
	}

	$this->rc->output->command('ksearch_query_results', $results, $search, $sid);
	$this->rc->output->send();
	}

	/**
	* Handler for load-requests for resource data
	*/
	function resources_list()
	{
	$data = array();

	if ($directory = $this->resources_directory()) {
	foreach ($directory->load_resources() as $rec) {
	$data[] = $rec;
	}
	}

	$this->rc->output->command('plugin.resource_data', $data);
	$this->rc->output->send();
	}

	/**
	* Handler for requests loading resource owner information
	*/
	function resources_owner()
	{
	if ($directory = $this->resources_directory()) {
	$id = rcube_utils::get_input_value('_id', rcube_utils::INPUT_GPC);
	$data = $directory->get_resource_owner($id);
	}

	$this->rc->output->command('plugin.resource_owner', $data);
	$this->rc->output->send();
	}

	/**
	* Deliver event data for a resource's calendar
	*/
	function resources_calendar()
	{
	$events = array();

	if ($directory = $this->resources_directory()) {
	$events = $directory->get_resource_calendar(
	rcube_utils::get_input_value('_id', rcube_utils::INPUT_GPC),
	rcube_utils::get_input_value('start', rcube_utils::INPUT_GET),
	rcube_utils::get_input_value('end', rcube_utils::INPUT_GET));
	}

	echo $this->encode($events);
	exit;
	}


	/** Event invitation plugin hooks **/

	/**
	* Handler for calendar/itip-status requests
	*/
	function event_itip_status()
	{
	$data = rcube_utils::get_input_value('data', rcube_utils::INPUT_POST, true);

	// find local copy of the referenced event
	$this->load_driver();
	$existing = $this->driver->get_event($data, true, false, true);

	$itip = $this->load_itip();
	$response = $itip->get_itip_status($data, $existing);

	// get a list of writeable calendars to save new events to
	if (!$existing && !$data['nosave'] && $response['action'] == 'rsvp' \|\| $response['action'] == 'import') {
	$calendars = $this->driver->list_calendars(false, true);
	$calendar_select = new html_select(array('name' => 'calendar', 'id' => 'itip-saveto', 'is_escaped' => true));
	$calendar_select->add('--', '');
	$numcals = 0;
	foreach ($calendars as $calendar) {
	if (!$calendar['readonly']) {
	$calendar_select->add($calendar['name'], $calendar['id']);
	$numcals++;
	}
	}
	if ($numcals <= 1)
	$calendar_select = null;
	}

	if ($calendar_select) {
	$default_calendar = $this->get_default_calendar(true, $data['sensitivity'] == 'confidential');
	$response['select'] = html::span('folder-select', $this->gettext('saveincalendar') . ' ' .
	$calendar_select->show($default_calendar['id']));
	}
	else if ($data['nosave']) {
	$response['select'] = html::tag('input', array('type' => 'hidden', 'name' => 'calendar', 'id' => 'itip-saveto', 'value' => ''));
	}

	// render small agenda view for the respective day
	if ($data['method'] == 'REQUEST' && !empty($data['date']) && $response['action'] == 'rsvp') {
	$event_start = rcube_utils::anytodatetime($data['date']);
	$day_start = new Datetime(gmdate('Y-m-d 00:00', $data['date']), $this->lib->timezone);
	$day_end = new Datetime(gmdate('Y-m-d 23:59', $data['date']), $this->lib->timezone);

	// get events on that day from the user's personal calendars
	$calendars = $this->driver->list_calendars(false, true);
	$events = $this->driver->load_events($day_start->format('U'), $day_end->format('U'), null, array_keys($calendars));
	usort($events, function($a, $b) { return $a['start'] > $b['start'] ? 1 : -1; });

	$before = $after = array();
	foreach ($events as $event) {
	// TODO: skip events with free_busy == 'free' ?
	if ($event['uid'] == $data['uid'] \|\| $event['end'] < $day_start \|\| $event['start'] > $day_end)
	continue;
	else if ($event['start'] < $event_start)
	$before[] = $this->mail_agenda_event_row($event);
	else
	$after[] = $this->mail_agenda_event_row($event);
	}

	$response['append'] = array(
	'selector' => '.calendar-agenda-preview',
	'replacements' => array(
	'%before%' => !empty($before) ? join("\n", array_slice($before, -3)) : html::div('event-row no-event', $this->gettext('noearlierevents')),
	'%after%' => !empty($after) ? join("\n", array_slice($after, 0, 3)) : html::div('event-row no-event', $this->gettext('nolaterevents')),
	),
	);
	}

	$this->rc->output->command('plugin.update_itip_object_status', $response);
	}

	/**
	* Handler for calendar/itip-remove requests
	*/
	function event_itip_remove()
	{
	$success = false;
	$uid = rcube_utils::get_input_value('uid', rcube_utils::INPUT_POST);

	// search for event if only UID is given
	if ($event = $this->driver->get_event(array('uid' => $uid), true)) {
	$success = $this->driver->remove_event($event, true);
	}

	if ($success) {
	$this->rc->output->show_message('calendar.successremoval', 'confirmation');
	}
	else {
	$this->rc->output->show_message('calendar.errorsaving', 'error');
	}
	}

	/**
	* Handler for URLs that allow an invitee to respond on his invitation mail
	*/
	public function itip_attend_response($p)
	{
	if ($p['action'] == 'attend') {
	$this->ui->init();

	$this->rc->output->set_env('task', 'calendar'); // override some env vars
	$this->rc->output->set_env('refresh_interval', 0);
	$this->rc->output->set_pagetitle($this->gettext('calendar'));

	$itip = $this->load_itip();
	$token = rcube_utils::get_input_value('_t', rcube_utils::INPUT_GPC);

	// read event info stored under the given token
	if ($invitation = $itip->get_invitation($token)) {
	$this->token = $token;
	$this->event = $invitation['event'];

	// show message about cancellation
	if ($invitation['cancelled']) {
	$this->invitestatus = html::div('rsvp-status declined', $itip->gettext('eventcancelled'));
	}
	// save submitted RSVP status
	else if (!empty($_POST['rsvp'])) {
	$status = null;
	foreach (array('accepted','tentative','declined') as $method) {
	if ($_POST['rsvp'] == $itip->gettext('itip' . $method)) {
	$status = $method;
	break;
	}
	}

	// send itip reply to organizer
	$invitation['event']['comment'] = rcube_utils::get_input_value('_comment', rcube_utils::INPUT_POST);
	if ($status && $itip->update_invitation($invitation, $invitation['attendee'], strtoupper($status))) {
	$this->invitestatus = html::div('rsvp-status ' . strtolower($status), $itip->gettext('youhave'.strtolower($status)));
	}
	else
	$this->rc->output->command('display_message', $this->gettext('errorsaving'), 'error', -1);

	// if user is logged in...
	if ($this->rc->user->ID) {
	$this->load_driver();
	$invitation = $itip->get_invitation($token);

	// save the event to his/her default calendar if not yet present
	if (!$this->driver->get_event($this->event) && ($calendar = $this->get_default_calendar(true, $invitation['event']['sensitivity'] == 'confidential'))) {
	$invitation['event']['calendar'] = $calendar['id'];
	if ($this->driver->new_event($invitation['event']))
	$this->rc->output->command('display_message', $this->gettext(array('name' => 'importedsuccessfully', 'vars' => array('calendar' => $calendar['name']))), 'confirmation');
	}
	}
	}

	$this->register_handler('plugin.event_inviteform', array($this, 'itip_event_inviteform'));
	$this->register_handler('plugin.event_invitebox', array($this->ui, 'event_invitebox'));

	if (!$this->invitestatus) {
	$this->itip->set_rsvp_actions(array('accepted','tentative','declined'));
	$this->register_handler('plugin.event_rsvp_buttons', array($this->ui, 'event_rsvp_buttons'));
	}

	$this->rc->output->set_pagetitle($itip->gettext('itipinvitation') . ' ' . $this->event['title']);
	}
	else
	$this->rc->output->command('display_message', $this->gettext('itipinvalidrequest'), 'error', -1);

	$this->rc->output->send('calendar.itipattend');
	}
	}

	/**
	*
	*/
	public function itip_event_inviteform($attrib)
	{
	$hidden = new html_hiddenfield(array('name' => "_t", 'value' => $this->token));
	return html::tag('form', array('action' => $this->rc->url(array('task' => 'calendar', 'action' => 'attend')), 'method' => 'post', 'noclose' => true) + $attrib) . $hidden->show();
	}

	/**
	*
	*/
	private function mail_agenda_event_row($event, $class = '')
	{
	$time = $event['all-day'] ? $this->gettext('allday') :
	$this->rc->format_date($event['start'], $this->rc->config->get('time_format')) . ' - ' .
	$this->rc->format_date($event['end'], $this->rc->config->get('time_format'));

	return html::div(rtrim('event-row ' . $class),
	html::span('event-date', $time) .
	html::span('event-title', Q($event['title']))
	);
	}

	/**
	*
	*/
	public function mail_messages_list($p)
	{
	if (in_array('attachment', (array)$p['cols']) && !empty($p['messages'])) {
	foreach ($p['messages'] as $header) {
	$part = new StdClass;
	$part->mimetype = $header->ctype;
	if (libcalendaring::part_is_vcalendar($part)) {
	$header->list_flags['attachmentClass'] = 'ical';
	}
	else if (in_array($header->ctype, array('multipart/alternative', 'multipart/mixed'))) {
	// TODO: fetch bodystructure and search for ical parts. Maybe too expensive?

	if (!empty($header->structure) && is_array($header->structure->parts)) {
	foreach ($header->structure->parts as $part) {
	if (libcalendaring::part_is_vcalendar($part) && !empty($part->ctype_parameters['method'])) {
	$header->list_flags['attachmentClass'] = 'ical';
	break;
	}
	}
	}
	}
	}
	}
	}

	/**
	* Add UI element to copy event invitations or updates to the calendar
	*/
	public function mail_messagebody_html($p)
	{
	// load iCalendar functions (if necessary)
	if (!empty($this->lib->ical_parts)) {
	$this->get_ical();
	$this->load_itip();
	}

	$html = '';
	$has_events = false;
	$ical_objects = $this->lib->get_mail_ical_objects();

	// show a box for every event in the file
	foreach ($ical_objects as $idx => $event) {
	if ($event['_type'] != 'event') // skip non-event objects (#2928)
	continue;

	$has_events = true;

	// get prepared inline UI for this event object
	if ($ical_objects->method) {
	$append = '';

	// prepare a small agenda preview to be filled with actual event data on async request
	if ($ical_objects->method == 'REQUEST') {
	$append = html::div('calendar-agenda-preview',
	html::tag('h3', 'preview-title', $this->gettext('agenda') . ' ' .
	html::span('date', $this->rc->format_date($event['start'], $this->rc->config->get('date_format')))
	) . '%before%' . $this->mail_agenda_event_row($event, 'current') . '%after%');
	}

	$html .= html::div('calendar-invitebox',
	$this->itip->mail_itip_inline_ui(
	$event,
	$ical_objects->method,
	$ical_objects->mime_id . ':' . $idx,
	'calendar',
	rcube_utils::anytodatetime($ical_objects->message_date),
	$this->rc->url(array('task' => 'calendar')) . '&view=agendaDay&date=' . $event['start']->format('U')
	) . $append
	);
	}

	// limit listing
	if ($idx >= 3)
	break;
	}

	// prepend event boxes to message body
	if ($html) {
	$this->ui->init();
	$p['content'] = $html . $p['content'];
	$this->rc->output->add_label('calendar.savingdata','calendar.deleteventconfirm','calendar.declinedeleteconfirm');
	}

	// add "Save to calendar" button into attachment menu
	if ($has_events) {
	$this->add_button(array(
	'id' => 'attachmentsavecal',
	'name' => 'attachmentsavecal',
	'type' => 'link',
	'wrapper' => 'li',
	'command' => 'attachment-save-calendar',
	'class' => 'icon calendarlink',
	'classact' => 'icon calendarlink active',
	'innerclass' => 'icon calendar',
	'label' => 'calendar.savetocalendar',
	), 'attachmentmenu');
	}

	return $p;
	}


	/**
	* Handler for POST request to import an event attached to a mail message
	*/
	public function mail_import_itip()
	{
	$itip_sending = $this->rc->config->get('calendar_itip_send_option', $this->defaults['calendar_itip_send_option']);

	$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_POST);
	$mbox = rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST);
	$mime_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_POST);
	$status = rcube_utils::get_input_value('_status', rcube_utils::INPUT_POST);
	$delete = intval(rcube_utils::get_input_value('_del', rcube_utils::INPUT_POST));
	$noreply = intval(rcube_utils::get_input_value('_noreply', rcube_utils::INPUT_POST));
	$noreply = $noreply \|\| $status == 'needs-action' \|\| $itip_sending === 0;

	$error_msg = $this->gettext('errorimportingevent');
	$success = false;
	$delegate = null;

	if ($status == 'delegated') {
	$delegates = rcube_mime::decode_address_list(rcube_utils::get_input_value('_to', rcube_utils::INPUT_POST, true), 1, false);
	$delegate = reset($delegates);

	if (empty($delegate) \|\| empty($delegate['mailto'])) {
	$this->rc->output->command('display_message', $this->gettext('libcalendaring.delegateinvalidaddress'), 'error');
	return;
	}
	}

	// successfully parsed events?
	if ($event = $this->lib->mail_get_itip_object($mbox, $uid, $mime_id, 'event')) {
	// forward iTip request to delegatee
	if ($delegate) {
	$rsvpme = intval(rcube_utils::get_input_value('_rsvp', rcube_utils::INPUT_POST));

	$itip = $this->load_itip();
	if ($itip->delegate_to($event, $delegate, $rsvpme ? true : false)) {
	$this->rc->output->show_message('calendar.itipsendsuccess', 'confirmation');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}

	// the delegator is set to non-participant, thus save as non-blocking
	$event['free_busy'] = 'free';
	}

	// find writeable calendar to store event
	$cal_id = !empty($_REQUEST['_folder']) ? rcube_utils::get_input_value('_folder', rcube_utils::INPUT_POST) : null;
	$dontsave = ($_REQUEST['_folder'] === '' && $event['_method'] == 'REQUEST');
	$calendars = $this->driver->list_calendars(false, true);
	$calendar = $calendars[$cal_id];

	// select default calendar except user explicitly selected 'none'
	if (!$calendar && !$dontsave)
	$calendar = $this->get_default_calendar(true, $event['sensitivity'] == 'confidential');

	$metadata = array(
	'uid' => $event['uid'],
	'changed' => is_object($event['changed']) ? $event['changed']->format('U') : 0,
	'sequence' => intval($event['sequence']),
	'fallback' => strtoupper($status),
	'method' => $event['_method'],
	'task' => 'calendar',
	);

	// update my attendee status according to submitted method
	if (!empty($status)) {
	$organizer = null;
	$emails = $this->get_user_emails();
	foreach ($event['attendees'] as $i => $attendee) {
	if ($attendee['role'] == 'ORGANIZER') {
	$organizer = $attendee;
	}
	else if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	$event['attendees'][$i]['status'] = strtoupper($status);
	if (!in_array($event['attendees'][$i]['status'], array('NEEDS-ACTION','DELEGATED')))
	$event['attendees'][$i]['rsvp'] = false; // unset RSVP attribute

	$metadata['attendee'] = $attendee['email'];
	$metadata['rsvp'] = $attendee['role'] != 'NON-PARTICIPANT';
	$reply_sender = $attendee['email'];
	$event_attendee = $attendee;
	}
	}

	// add attendee with this user's default identity if not listed
	if (!$reply_sender) {
	$sender_identity = $this->rc->user->list_emails(true);
	$event['attendees'][] = array(
	'name' => $sender_identity['name'],
	'email' => $sender_identity['email'],
	'role' => 'OPT-PARTICIPANT',
	'status' => strtoupper($status),
	);
	$metadata['attendee'] = $sender_identity['email'];
	}
	}

	// save to calendar
	if ($calendar && !$calendar['readonly']) {
	$event['calendar'] = $calendar['id'];

	// check for existing event with the same UID
	$existing = $this->driver->get_event($event['uid'], true, false, true);

	if ($existing) {
	// only update attendee status
	if ($event['_method'] == 'REPLY') {
	// try to identify the attendee using the email sender address
	$existing_attendee = -1;
	$existing_attendee_emails = array();
	foreach ($existing['attendees'] as $i => $attendee) {
	$existing_attendee_emails[] = $attendee['email'];
	if ($event['_sender'] && ($attendee['email'] == $event['_sender'] \|\| $attendee['email'] == $event['_sender_utf'])) {
	$existing_attendee = $i;
	}
	}
	$event_attendee = null;
	foreach ($event['attendees'] as $attendee) {
	if ($event['_sender'] && ($attendee['email'] == $event['_sender'] \|\| $attendee['email'] == $event['_sender_utf'])) {
	$event_attendee = $attendee;
	$metadata['fallback'] = $attendee['status'];
	$metadata['attendee'] = $attendee['email'];
	$metadata['rsvp'] = $attendee['rsvp'] \|\| $attendee['role'] != 'NON-PARTICIPANT';
	if ($attendee['status'] != 'DELEGATED') {
	break;
	}
	}
	// also copy delegate attendee
	else if (!empty($attendee['delegated-from']) &&
	(stripos($attendee['delegated-from'], $event['_sender']) !== false \|\| stripos($attendee['delegated-from'], $event['_sender_utf']) !== false) &&
	(!in_array($attendee['email'], $existing_attendee_emails))) {
	$existing['attendees'][] = $attendee;
	}
	}

	// if delegatee has declined, set delegator's RSVP=True
	if ($event_attendee && $event_attendee['status'] == 'DECLINED' && $event_attendee['delegated-from']) {
	foreach ($existing['attendees'] as $i => $attendee) {
	if ($attendee['email'] == $event_attendee['delegated-from']) {
	$existing['attendees'][$i]['rsvp'] = true;
	break;
	}
	}
	}

	// found matching attendee entry in both existing and new events
	if ($existing_attendee >= 0 && $event_attendee) {
	$existing['attendees'][$existing_attendee] = $event_attendee;
	$success = $this->driver->edit_event($existing);
	}
	// update the entire attendees block
	else if (($event['sequence'] >= $existing['sequence'] \|\| $event['changed'] >= $existing['changed']) && $event_attendee) {
	$existing['attendees'][] = $event_attendee;
	$success = $this->driver->edit_event($existing);
	}
	else {
	$error_msg = $this->gettext('newerversionexists');
	}
	}
	// delete the event when declined (#1670)
	else if ($status == 'declined' && $delete) {
	$deleted = $this->driver->remove_event($existing, true);
	$success = true;
	}
	// import the (newer) event
	else if ($event['sequence'] >= $existing['sequence'] \|\| $event['changed'] >= $existing['changed']) {
	$event['id'] = $existing['id'];
	$event['calendar'] = $existing['calendar'];

	// preserve my participant status for regular updates
	if (empty($status)) {
	$emails = $this->get_user_emails();
	foreach ($event['attendees'] as $i => $attendee) {
	if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	foreach ($existing['attendees'] as $j => $_attendee) {
	if ($attendee['email'] == $_attendee['email']) {
	$event['attendees'][$i] = $existing['attendees'][$j];
	break;
	}
	}
	}
	}
	}

	// set status=CANCELLED on CANCEL messages
	if ($event['_method'] == 'CANCEL')
	$event['status'] = 'CANCELLED';
	// show me as free when declined (#1670)
	if ($status == 'declined' \|\| $event['status'] == 'CANCELLED' \|\| $event_attendee['role'] == 'NON-PARTICIPANT')
	$event['free_busy'] = 'free';

	$success = $this->driver->edit_event($event);
	}
	else if (!empty($status)) {
	$existing['attendees'] = $event['attendees'];
	if ($status == 'declined' \|\| $event_attendee['role'] == 'NON-PARTICIPANT') // show me as free when declined (#1670)
	$existing['free_busy'] = 'free';
	$success = $this->driver->edit_event($existing);
	}
	else
	$error_msg = $this->gettext('newerversionexists');
	}
	else if (!$existing && ($status != 'declined' \|\| $this->rc->config->get('kolab_invitation_calendars'))) {
	if ($status == 'declined' \|\| $event['status'] == 'CANCELLED' \|\| $event_attendee['role'] == 'NON-PARTICIPANT') {
	$event['free_busy'] = 'free';
	}
	$success = $this->driver->new_event($event);
	}
	else if ($status == 'declined')
	$error_msg = null;
	}
	else if ($status == 'declined' \|\| $dontsave)
	$error_msg = null;
	else
	$error_msg = $this->gettext('nowritecalendarfound');
	}

	if ($success) {
	$message = $event['_method'] == 'REPLY' ? 'attendeupdateesuccess' : ($deleted ? 'successremoval' : ($existing ? 'updatedsuccessfully' : 'importedsuccessfully'));
	$this->rc->output->command('display_message', $this->gettext(array('name' => $message, 'vars' => array('calendar' => $calendar['name']))), 'confirmation');
	}

	if ($success \|\| $dontsave) {
	$metadata['calendar'] = $event['calendar'];
	$metadata['nosave'] = $dontsave;
	$metadata['rsvp'] = intval($metadata['rsvp']);
	$metadata['after_action'] = $this->rc->config->get('calendar_itip_after_action', $this->defaults['calendar_itip_after_action']);
	$this->rc->output->command('plugin.itip_message_processed', $metadata);
	$error_msg = null;
	}
	else if ($error_msg) {
	$this->rc->output->command('display_message', $error_msg, 'error');
	}

	// send iTip reply
	if ($event['_method'] == 'REQUEST' && $organizer && !$noreply && !in_array(strtolower($organizer['email']), $emails) && !$error_msg) {
	$event['comment'] = rcube_utils::get_input_value('_comment', rcube_utils::INPUT_POST);
	$itip = $this->load_itip();
	$itip->set_sender_email($reply_sender);
	if ($itip->send_itip_message($event, 'REPLY', $organizer, 'itipsubject' . $status, 'itipmailbody' . $status))
	$this->rc->output->command('display_message', $this->gettext(array('name' => 'sentresponseto', 'vars' => array('mailto' => $organizer['name'] ? $organizer['name'] : $organizer['email']))), 'confirmation');
	else
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}

	$this->rc->output->send();
	}


	/**
	* Handler for calendar/itip-remove requests
	*/
	function mail_itip_decline_reply()
	{
	$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_POST);
	$mbox = rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST);
	$mime_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_POST);

	if (($event = $this->lib->mail_get_itip_object($mbox, $uid, $mime_id, 'event')) && $event['_method'] == 'REPLY') {
	$event['comment'] = rcube_utils::get_input_value('_comment', rcube_utils::INPUT_POST);

	foreach ($event['attendees'] as $_attendee) {
	if ($_attendee['role'] != 'ORGANIZER') {
	$attendee = $_attendee;
	break;
	}
	}

	$itip = $this->load_itip();
	if ($itip->send_itip_message($event, 'CANCEL', $attendee, 'itipsubjectcancel', 'itipmailbodycancel'))
	$this->rc->output->command('display_message', $this->gettext(array('name' => 'sentresponseto', 'vars' => array('mailto' => $attendee['name'] ? $attendee['name'] : $attendee['email']))), 'confirmation');
	else
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}
	}

	/**
	* Handler for calendar/itip-delegate requests
	*/
	function mail_itip_delegate()
	{
	// forward request to mail_import_itip() with the right status
	$_POST['_status'] = $_REQUEST['_status'] = 'delegated';
	$this->mail_import_itip();
	}

	/**
	* Import the full payload from a mail message attachment
	*/
	public function mail_import_attachment()
	{
	$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_POST);
	$mbox = rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST);
	$mime_id = rcube_utils::get_input_value('_part', rcube_utils::INPUT_POST);
	$charset = RCMAIL_CHARSET;

	// establish imap connection
	$imap = $this->rc->get_storage();
	$imap->set_mailbox($mbox);

	if ($uid && $mime_id) {
	$part = $imap->get_message_part($uid, $mime_id);
	if ($part->ctype_parameters['charset'])
	$charset = $part->ctype_parameters['charset'];
	// $headers = $imap->get_message_headers($uid);

	if ($part) {
	$events = $this->get_ical()->import($part, $charset);
	}
	}

	$success = $existing = 0;
	if (!empty($events)) {
	// find writeable calendar to store event
	$cal_id = !empty($_REQUEST['_calendar']) ? rcube_utils::get_input_value('_calendar', rcube_utils::INPUT_POST) : null;
	$calendars = $this->driver->list_calendars(false, true);

	foreach ($events as $event) {
	// save to calendar
	$calendar = $calendars[$cal_id] ?: $this->get_default_calendar(true, $event['sensitivity'] == 'confidential');
	if ($calendar && !$calendar['readonly'] && $event['_type'] == 'event') {
	$event['calendar'] = $calendar['id'];

	if (!$this->driver->get_event($event['uid'], true, false)) {
	$success += (bool)$this->driver->new_event($event);
	}
	else {
	$existing++;
	}
	}
	}
	}

	if ($success) {
	$this->rc->output->command('display_message', $this->gettext(array(
	'name' => 'importsuccess',
	'vars' => array('nr' => $success),
	)), 'confirmation');
	}
	else if ($existing) {
	$this->rc->output->command('display_message', $this->gettext('importwarningexists'), 'warning');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('errorimportingevent'), 'error');
	}
	}

	/**
	* Read email message and return contents for a new event based on that message
	*/
	public function mail_message2event()
	{
	$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_POST);
	$mbox = rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_POST);
	$event = array();

	// establish imap connection
	$imap = $this->rc->get_storage();
	$imap->set_mailbox($mbox);
	$message = new rcube_message($uid);

	if ($message->headers) {
	$event['title'] = trim($message->subject);
	$event['description'] = trim($message->first_text_part());

	$this->load_driver();

	// add a reference to the email message
	if ($msgref = $this->driver->get_message_reference($message->headers, $mbox)) {
	$event['links'] = array($msgref);
	}
	// copy mail attachments to event
	else if ($message->attachments) {
	$eventid = 'cal-';
	if (!is_array($_SESSION[self::SESSION_KEY]) \|\| $_SESSION[self::SESSION_KEY]['id'] != $eventid) {
	$_SESSION[self::SESSION_KEY] = array();
	$_SESSION[self::SESSION_KEY]['id'] = $eventid;
	$_SESSION[self::SESSION_KEY]['attachments'] = array();
	}

	foreach ((array)$message->attachments as $part) {
	$attachment = array(
	'data' => $imap->get_message_part($uid, $part->mime_id, $part),
	'size' => $part->size,
	'name' => $part->filename,
	'mimetype' => $part->mimetype,
	'group' => $eventid,
	);

	$attachment = $this->rc->plugins->exec_hook('attachment_save', $attachment);

	if ($attachment['status'] && !$attachment['abort']) {
	$id = $attachment['id'];
	$attachment['classname'] = rcube_utils::file2class($attachment['mimetype'], $attachment['name']);

	// store new attachment in session
	unset($attachment['status'], $attachment['abort'], $attachment['data']);
	$_SESSION[self::SESSION_KEY]['attachments'][$id] = $attachment;

	$attachment['id'] = 'rcmfile' . $attachment['id']; // add prefix to consider it 'new'
	$event['attachments'][] = $attachment;
	}
	}
	}

	$this->rc->output->command('plugin.mail2event_dialog', $event);
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('messageopenerror'), 'error');
	}

	$this->rc->output->send();
	}

	/**
	* Handler for the 'message_compose' plugin hook. This will check for
	* a compose parameter 'calendar_event' and create an attachment with the
	* referenced event in iCal format
	*/
	public function mail_message_compose($args)
	{
	// set the submitted event ID as attachment
	if (!empty($args['param']['calendar_event'])) {
	$this->load_driver();

	list($cal, $id) = explode(':', $args['param']['calendar_event'], 2);
	if ($event = $this->driver->get_event(array('id' => $id, 'calendar' => $cal))) {
	$filename = asciiwords($event['title']);
	if (empty($filename))
	$filename = 'event';

	// save ics to a temp file and register as attachment
	$tmp_path = tempnam($this->rc->config->get('temp_dir'), 'rcmAttmntCal');
	file_put_contents($tmp_path, $this->get_ical()->export(array($event), '', false, array($this->driver, 'get_attachment_body')));

	$args['attachments'][] = array('path' => $tmp_path, 'name' => $filename . '.ics', 'mimetype' => 'text/calendar');
	$args['param']['subject'] = $event['title'];
	}
	}

	return $args;
	}


	/**
	* Get a list of email addresses of the current user (from login and identities)
	*/
	public function get_user_emails()
	{
	return $this->lib->get_user_emails();
	}


	/**
	* Build an absolute URL with the given parameters
	*/
	public function get_url($param = array())
	{
	$param += array('task' => 'calendar');
	return $this->rc->url($param, true, true);
	}


	public function ical_feed_hash($source)
	{
	return base64_encode($this->rc->user->get_username() . ':' . $source);
	}

	/**
	* Handler for user_delete plugin hook
	*/
	public function user_delete($args)
	{
	$this->load_driver();
	return $this->driver->user_delete($args);
	}

	/**
	* Magic getter for public access to protected members
	*/
	public function __get($name)
	{
	switch ($name) {
	case 'ical':
	return $this->get_ical();

	case 'itip':
	return $this->load_itip();

	case 'driver':
	$this->load_driver();
	return $this->driver;
	}

	return null;
	}

	}
	diff --git a/plugins/calendar/drivers/calendar_driver.php b/plugins/calendar/drivers/calendar_driver.php
	index 4ec53c4b..24e7a2e8 100644
	--- a/plugins/calendar/drivers/calendar_driver.php
	+++ b/plugins/calendar/drivers/calendar_driver.php
	@@ -1,742 +1,797 @@
	<?php

	/**
	* Driver interface for the Calendar plugin
	*
	* @version @package_version@
	* @author Lazlo Westerhof <hello@lazlo.me>
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2010, Lazlo Westerhof <hello@lazlo.me>
	* Copyright (C) 2012-2014, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* 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/>.
	*/


	/**
	* Struct of an internal event object how it is passed from/to the driver classes:
	*
	* $event = array(
	* 'id' => 'Event ID used for editing',
	* 'uid' => 'Unique identifier of this event',
	* 'calendar' => 'Calendar identifier to add event to or where the event is stored',
	* 'start' => DateTime, // Event start date/time as DateTime object
	* 'end' => DateTime, // Event end date/time as DateTime object
	* 'allday' => true\|false, // Boolean flag if this is an all-day event
	* 'changed' => DateTime, // Last modification date of event
	* 'title' => 'Event title/summary',
	* 'location' => 'Location string',
	* 'description' => 'Event description',
	* 'url' => 'URL to more information',
	* 'recurrence' => array( // Recurrence definition according to iCalendar (RFC 2445) specification as list of key-value pairs
	* 'FREQ' => 'DAILY\|WEEKLY\|MONTHLY\|YEARLY',
	* 'INTERVAL' => 1...n,
	* 'UNTIL' => DateTime,
	* 'COUNT' => 1..n, // number of times
	* // + more properties (see http://www.kanzaki.com/docs/ical/recur.html)
	* 'EXDATE' => array(), // list of DateTime objects of exception Dates/Times
	* 'EXCEPTIONS' => array(<event>), list of event objects which denote exceptions in the recurrence chain
	* ),
	* 'recurrence_id' => 'ID of the recurrence group', // usually the ID of the starting event
	* 'categories' => 'Event category',
	* 'free_busy' => 'free\|busy\|outofoffice\|tentative', // Show time as
	* 'status' => 'TENTATIVE\|CONFIRMED\|CANCELLED', // event status according to RFC 2445
	* 'priority' => 0-9, // Event priority (0=undefined, 1=highest, 9=lowest)
	* 'sensitivity' => 'public\|private\|confidential', // Event sensitivity
	* 'alarms' => '-15M:DISPLAY', // DEPRECATED Reminder settings inspired by valarm definition (e.g. display alert 15 minutes before event)
	* 'valarms' => array( // List of reminders (new format), each represented as a hash array:
	* array(
	* 'trigger' => '-PT90M', // ISO 8601 period string prefixed with '+' or '-', or DateTime object
	* 'action' => 'DISPLAY\|EMAIL\|AUDIO',
	* 'duration' => 'PT15M', // ISO 8601 period string
	* 'repeat' => 0, // number of repetitions
	* 'description' => '', // text to display for DISPLAY actions
	* 'summary' => '', // message text for EMAIL actions
	* 'attendees' => array(), // list of email addresses to receive alarm messages
	* ),
	* ),
	* 'attachments' => array( // List of attachments
	* 'name' => 'File name',
	* 'mimetype' => 'Content type',
	* 'size' => 1..n, // in bytes
	* 'id' => 'Attachment identifier'
	* ),
	* 'deleted_attachments' => array(), // array of attachment identifiers to delete when event is updated
	* 'attendees' => array( // List of event participants
	* 'name' => 'Participant name',
	* 'email' => 'Participant e-mail address', // used as identifier
	* 'role' => 'ORGANIZER\|REQ-PARTICIPANT\|OPT-PARTICIPANT\|CHAIR',
	* 'status' => 'NEEDS-ACTION\|UNKNOWN\|ACCEPTED\|TENTATIVE\|DECLINED'
	* 'rsvp' => true\|false,
	* ),
	*
	* '_savemode' => 'all\|future\|current\|new', // How changes on recurring event should be handled
	* '_notify' => true\|false, // whether to notify event attendees about changes
	* '_fromcalendar' => 'Calendar identifier where the event was stored before',
	* );
	*/

	/**
	* Interface definition for calendar driver classes
	*/
	abstract class calendar_driver
	{
	const BIRTHDAY_CALENDAR_ID = '__bdays__';

	// features supported by backend
	public $alarms = false;
	public $attendees = false;
	public $freebusy = false;
	public $attachments = false;
	public $undelete = false;
	public $history = false;
	public $categoriesimmutable = false;
	public $alarm_types = array('DISPLAY');
	public $alarm_absolute = true;
	public $last_error;

	protected $default_categories = array(
	'Personal' => 'c0c0c0',
	'Work' => 'ff0000',
	'Family' => '00ff00',
	'Holiday' => 'ff6600',
	);

	/**
	* Get a list of available calendars from this source
	*
	* @param bool $active Return only active calendars
	* @param bool $personal Return only personal calendars
	*
	* @return array List of calendars
	*/
	abstract function list_calendars($active = false, $personal = false);

	/**
	* Create a new calendar assigned to the current user
	*
	* @param array Hash array with calendar properties
	* name: Calendar name
	* color: The color of the calendar
	* showalarms: True if alarms are enabled
	* @return mixed ID of the calendar on success, False on error
	*/
	abstract function create_calendar($prop);

	/**
	* Update properties of an existing calendar
	*
	* @param array Hash array with calendar properties
	* id: Calendar Identifier
	* name: Calendar name
	* color: The color of the calendar
	* showalarms: True if alarms are enabled (if supported)
	* @return boolean True on success, Fales on failure
	*/
	abstract function edit_calendar($prop);

	/**
	* Set active/subscribed state of a calendar
	*
	* @param array Hash array with calendar properties
	* id: Calendar Identifier
	* active: True if calendar is active, false if not
	* @return boolean True on success, Fales on failure
	*/
	abstract function subscribe_calendar($prop);

	/**
	* Delete the given calendar with all its contents
	*
	* @param array Hash array with calendar properties
	* id: Calendar Identifier
	* @return boolean True on success, Fales on failure
	*/
	abstract function delete_calendar($prop);

	/**
	* Search for shared or otherwise not listed calendars the user has access
	*
	* @param string Search string
	* @param string Section/source to search
	* @return array List of calendars
	*/
	abstract function search_calendars($query, $source);

	/**
	* Add a single event to the database
	*
	* @param array Hash array with event properties (see header of this file)
	* @return mixed New event ID on success, False on error
	*/
	abstract function new_event($event);

	/**
	* Update an event entry with the given data
	*
	* @param array Hash array with event properties (see header of this file)
	* @return boolean True on success, False on error
	*/
	abstract function edit_event($event);

	/**
	* Extended event editing with possible changes to the argument
	*
	* @param array Hash array with event properties
	* @param string New participant status
	* @return boolean True on success, False on error
	*/
	public function edit_rsvp(&$event, $status)
	{
	return $this->edit_event($event);
	}

	/**
	* Move a single event
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	* start: Event start date/time as DateTime object
	* end: Event end date/time as DateTime object
	* allday: Boolean flag if this is an all-day event
	* @return boolean True on success, False on error
	*/
	abstract function move_event($event);

	/**
	* Resize a single event
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	* start: Event start date/time as DateTime object with timezone
	* end: Event end date/time as DateTime object with timezone
	* @return boolean True on success, False on error
	*/
	abstract function resize_event($event);

	/**
	* Remove a single event from the database
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	* @param boolean Remove event irreversible (mark as deleted otherwise,
	* if supported by the backend)
	*
	* @return boolean True on success, False on error
	*/
	abstract function remove_event($event, $force = true);

	/**
	* Restores a single deleted event (if supported)
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	*
	* @return boolean True on success, False on error
	*/
	public function restore_event($event)
	{
	return false;
	}

	/**
	* Return data of a single event
	*
	* @param mixed UID string or hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier (optional)
	* @param boolean If true, only writeable calendars shall be searched
	* @param boolean If true, only active calendars shall be searched
	* @param boolean If true, only personal calendars shall be searched
	*
	* @return array Event object as hash array
	*/
	abstract function get_event($event, $writeable = false, $active = false, $personal = false);

	/**
	* Get events from source.
	*
	* @param integer Date range start (unix timestamp)
	* @param integer Date range end (unix timestamp)
	* @param string Search query (optional)
	* @param mixed List of calendar IDs to load events from (either as array or comma-separated string)
	* @param boolean Include virtual/recurring events (optional)
	* @param integer Only list events modified since this time (unix timestamp)
	* @return array A list of event objects (see header of this file for struct of an event)
	*/
	abstract function load_events($start, $end, $query = null, $calendars = null, $virtual = 1, $modifiedsince = null);

	/**
	* Get number of events in the given calendar
	*
	* @param mixed List of calendar IDs to count events (either as array or comma-separated string)
	* @param integer Date range start (unix timestamp)
	* @param integer Date range end (unix timestamp)
	* @return array Hash array with counts grouped by calendar ID
	*/
	abstract function count_events($calendars, $start, $end = null);

	/**
	* Get a list of pending alarms to be displayed to the user
	*
	* @param integer Current time (unix timestamp)
	* @param mixed List of calendar IDs to show alarms for (either as array or comma-separated string)
	* @return array A list of alarms, each encoded as hash array:
	* id: Event identifier
	* uid: Unique identifier of this event
	* start: Event start date/time as DateTime object
	* end: Event end date/time as DateTime object
	* allday: Boolean flag if this is an all-day event
	* title: Event title/summary
	* location: Location string
	*/
	abstract function pending_alarms($time, $calendars = null);

	/**
	* (User) feedback after showing an alarm notification
	* This should mark the alarm as 'shown' or snooze it for the given amount of time
	*
	* @param string Event identifier
	* @param integer Suspend the alarm for this number of seconds
	*/
	abstract function dismiss_alarm($event_id, $snooze = 0);

	/**
	* Check the given event object for validity
	*
	* @param array Event object as hash array
	* @return boolean True if valid, false if not
	*/
	public function validate($event)
	{
	$valid = true;

	if (!is_object($event['start']) \|\| !is_a($event['start'], 'DateTime'))
	$valid = false;
	if (!is_object($event['end']) \|\| !is_a($event['end'], 'DateTime'))
	$valid = false;

	return $valid;
	}


	/**
	* Get list of event's attachments.
	* Drivers can return list of attachments as event property.
	* If they will do not do this list_attachments() method will be used.
	*
	* @param array $event Hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier
	*
	* @return array List of attachments, each as hash array:
	* id: Attachment identifier
	* name: Attachment name
	* mimetype: MIME content type of the attachment
	* size: Attachment size
	*/
	public function list_attachments($event) { }

	/**
	* Get attachment properties
	*
	* @param string $id Attachment identifier
	* @param array $event Hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier
	*
	* @return array Hash array with attachment properties:
	* id: Attachment identifier
	* name: Attachment name
	* mimetype: MIME content type of the attachment
	* size: Attachment size
	*/
	public function get_attachment($id, $event) { }

	/**
	* Get attachment body
	*
	* @param string $id Attachment identifier
	* @param array $event Hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier
	*
	* @return string Attachment body
	*/
	public function get_attachment_body($id, $event) { }

	/**
	* Build a struct representing the given message reference
	*
	* @param object\|string $uri_or_headers rcube_message_header instance holding the message headers
	* or an URI from a stored link referencing a mail message.
	* @param string $folder IMAP folder the message resides in
	*
	* @return array An struct referencing the given IMAP message
	*/
	public function get_message_reference($uri_or_headers, $folder = null)
	{
	// to be implemented by the derived classes
	return false;
	}

	/**
	* List availabale categories
	* The default implementation reads them from config/user prefs
	*/
	public function list_categories()
	{
	$rcmail = rcube::get_instance();
	return $rcmail->config->get('calendar_categories', $this->default_categories);
	}

	/**
	* Create a new category
	*/
	public function add_category($name, $color) { }

	/**
	* Remove the given category
	*/
	public function remove_category($name) { }

	/**
	* Update/replace a category
	*/
	public function replace_category($oldname, $name, $color) { }

	/**
	* Fetch free/busy information from a person within the given range
	*
	* @param string E-mail address of attendee
	* @param integer Requested period start date/time as unix timestamp
	* @param integer Requested period end date/time as unix timestamp
	*
	* @return array List of busy timeslots within the requested range
	*/
	public function get_freebusy_list($email, $start, $end)
	{
	return false;
	}

	+ /**
	+ * Create instances of a recurring event
	+ *
	+ * @param array Hash array with event properties
	+ * @param object DateTime Start date of the recurrence window
	+ * @param object DateTime End date of the recurrence window
	+ * @return array List of recurring event instances
	+ */
	+ public function get_recurring_events($event, $start, $end = null)
	+ {
	+ $events = array();
	+
	+ if ($event['recurrence']) {
	+ // include library class
	+ require_once(dirname(__FILE__) . '/../lib/calendar_recurrence.php');
	+
	+ $rcmail = rcmail::get_instance();
	+ $recurrence = new calendar_recurrence($rcmail->plugins->get_plugin('calendar'), $event);
	+
	+ // determine a reasonable end date if none given
	+ if (!$end) {
	+ switch ($event['recurrence']['FREQ']) {
	+ case 'YEARLY': $intvl = 'P100Y'; break;
	+ case 'MONTHLY': $intvl = 'P20Y'; break;
	+ default: $intvl = 'P10Y'; break;
	+ }
	+
	+ $end = clone $event['start'];
	+ $end->add(new DateInterval($intvl));
	+ }
	+
	+ $i = 0;
	+ while ($next_event = $recurrence->next_instance()) {
	+ $next_event['uid'] = $event['uid'] . '-' . ++$i;
	+ // add to output if in range
	+ if (($next_event['start'] <= $end && $next_event['end'] >= $start)) {
	+ $next_event['id'] = $next_event['uid'];
	+ $next_event['recurrence_id'] = $event['uid'];
	+ $next_event['_instance'] = $i;
	+ $events[] = $next_event;
	+ }
	+ else if ($next_event['start'] > $end) { // stop loop if out of range
	+ break;
	+ }
	+
	+ // avoid endless recursion loops
	+ if ($i > 1000) {
	+ break;
	+ }
	+ }
	+ }
	+
	+ return $events;
	+ }
	+
	/**
	* Provide a list of revisions for the given event
	*
	* @param array $event Hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier
	*
	* @return array List of changes, each as a hash array:
	* rev: Revision number
	* type: Type of the change (create, update, move, delete)
	* date: Change date
	* user: The user who executed the change
	* ip: Client IP
	* destination: Destination calendar for 'move' type
	*/
	public function get_event_changelog($event)
	{
	return false;
	}

	/**
	* Get a list of property changes beteen two revisions of an event
	*
	* @param array $event Hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier
	* @param mixed $rev Revisions: "from:to"
	*
	* @return array List of property changes, each as a hash array:
	* property: Revision number
	* old: Old property value
	* new: Updated property value
	*/
	public function get_event_diff($event, $rev)
	{
	return false;
	}

	/**
	* Return full data of a specific revision of an event
	*
	* @param mixed UID string or hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier
	* @param mixed $rev Revision number
	*
	* @return array Event object as hash array
	* @see self::get_event()
	*/
	public function get_event_revison($event, $rev)
	{
	return false;
	}

	/**
	* Command the backend to restore a certain revision of an event.
	* This shall replace the current event with an older version.
	*
	* @param mixed UID string or hash array with event properties:
	* id: Event identifier
	* calendar: Calendar identifier
	* @param mixed $rev Revision number
	*
	* @return boolean True on success, False on failure
	*/
	public function restore_event_revision($event, $rev)
	{
	return false;
	}


	/**
	* Callback function to produce driver-specific calendar create/edit form
	*
	* @param string Request action 'form-edit\|form-new'
	* @param array Calendar properties (e.g. id, color)
	* @param array Edit form fields
	*
	* @return string HTML content of the form
	*/
	public function calendar_form($action, $calendar, $formfields)
	{
	$html = '';
	foreach ($formfields as $field) {
	$html .= html::div('form-section',
	html::label($field['id'], $field['label']) .
	$field['value']);
	}

	return $html;
	}

	/**
	* Compose a list of birthday events from the contact records in the user's address books.
	*
	* This is a default implementation using Roundcube's address book API.
	* It can be overriden with a more optimized version by the individual drivers.
	*
	* @param integer Event's new start (unix timestamp)
	* @param integer Event's new end (unix timestamp)
	* @param string Search query (optional)
	* @param integer Only list events modified since this time (unix timestamp)
	* @return array A list of event records
	*/
	public function load_birthday_events($start, $end, $search = null, $modifiedsince = null)
	{
	// ignore update requests for simplicity reasons
	if (!empty($modifiedsince)) {
	return array();
	}

	// convert to DateTime for comparisons
	$start = new DateTime('@'.$start);
	$end = new DateTime('@'.$end);
	// extract the current year
	$year = $start->format('Y');
	$year2 = $end->format('Y');

	$events = array();
	$search = mb_strtolower($search);
	$rcmail = rcmail::get_instance();
	$cache = $rcmail->get_cache('calendar.birthdays', 'db', 3600);
	$cache->expunge();

	$alarm_type = $rcmail->config->get('calendar_birthdays_alarm_type', '');
	$alarm_offset = $rcmail->config->get('calendar_birthdays_alarm_offset', '-1D');
	$alarms = $alarm_type ? $alarm_offset . ':' . $alarm_type : null;

	// let the user select the address books to consider in prefs
	$selected_sources = $rcmail->config->get('calendar_birthday_adressbooks');
	$sources = $selected_sources ?: array_keys($rcmail->get_address_sources(false, true));
	foreach ($sources as $source) {
	$abook = $rcmail->get_address_book($source);

	// skip LDAP address books unless selected by the user
	if (!$abook \|\| ($abook instanceof rcube_ldap && empty($selected_sources))) {
	continue;
	}

	$abook->set_pagesize(10000);

	// check for cached results
	$cache_records = array();
	$cached = $cache->get($source);

	// iterate over (cached) contacts
	foreach (($cached ?: $abook->search('*', '', 2, true, true, array('birthday'))) as $contact) {
	if (is_array($contact) && !empty($contact['birthday'])) {
	try {
	if (is_array($contact['birthday']))
	$contact['birthday'] = reset($contact['birthday']);

	$bday = $contact['birthday'] instanceof DateTime ? $contact['birthday'] :
	new DateTime($contact['birthday'], new DateTimezone('UTC'));
	$birthyear = $bday->format('Y');
	}
	catch (Exception $e) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => 'BIRTHDAY PARSE ERROR: ' . $e),
	true, false);
	continue;
	}

	$display_name = rcube_addressbook::compose_display_name($contact);
	$event_title = $rcmail->gettext(array('name' => 'birthdayeventtitle', 'vars' => array('name' => $display_name)), 'calendar');

	// add stripped record to cache
	if (empty($cached)) {
	$cache_records[] = array(
	'ID' => $contact['ID'],
	'name' => $display_name,
	'birthday' => $bday->format('Y-m-d'),
	);
	}

	// filter by search term (only name is involved here)
	if (!empty($search) && strpos(mb_strtolower($event_title), $search) === false) {
	continue;
	}

	// quick-and-dirty recurrence computation: just replace the year
	$bday->setDate($year, $bday->format('n'), $bday->format('j'));
	$bday->setTime(12, 0, 0);

	// date range reaches over multiple years: use end year if not in range
	if (($bday > $end \|\| $bday < $start) && $year2 != $year) {
	$bday->setDate($year2, $bday->format('n'), $bday->format('j'));
	$year = $year2;
	}

	// birthday is within requested range
	if ($bday <= $end && $bday >= $start) {
	$age = $year - $birthyear;
	$event = array(
	'id' => rcube_ldap::dn_encode('bday:' . $source . ':' . $contact['ID'] . ':' . $year),
	'calendar' => self::BIRTHDAY_CALENDAR_ID,
	'title' => $event_title,
	'description' => $rcmail->gettext(array('name' => 'birthdayage', 'vars' => array('age' => $age)), 'calendar'),
	// Add more contact information to description block?
	'allday' => true,
	'start' => $bday,
	'alarms' => $alarms,
	);
	$event['end'] = clone $bday;
	$event['end']->add(new DateInterval('PT1H'));

	$events[] = $event;
	}
	}
	}

	// store collected contacts in cache
	if (empty($cached)) {
	$cache->write($source, $cache_records);
	}
	}

	return $events;
	}

	/**
	* Get a single birthday calendar event
	*/
	public function get_birthday_event($id)
	{
	// decode $id
	list(,$source,$contact_id,$year) = explode(':', rcube_ldap::dn_decode($id));

	$rcmail = rcmail::get_instance();

	if ($source && $contact_id && ($abook = $rcmail->get_address_book($source))) {
	$contact = $abook->get_record($contact_id, true);

	if (is_array($contact) && !empty($contact['birthday'])) {
	try {
	if (is_array($contact['birthday']))
	$contact['birthday'] = reset($contact['birthday']);

	$bday = $contact['birthday'] instanceof DateTime ? $contact['birthday'] :
	new DateTime($contact['birthday'], new DateTimezone('UTC'));
	$birthyear = $bday->format('Y');
	}
	catch (Exception $e) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => 'BIRTHDAY PARSE ERROR: ' . $e),
	true, false);

	return null;
	}

	$display_name = rcube_addressbook::compose_display_name($contact);
	$event_title = $rcmail->gettext(array('name' => 'birthdayeventtitle', 'vars' => array('name' => $display_name)), 'calendar');

	$event = array(
	'id' => rcube_ldap::dn_encode('bday:' . $source . ':' . $contact['ID'] . ':' . $year),
	'uid' => rcube_ldap::dn_encode('bday:' . $source . ':' . $contact['ID'] . ':' . $birthyear),
	'calendar' => self::BIRTHDAY_CALENDAR_ID,
	'title' => $event_title,
	'description' => '',
	'allday' => true,
	'start' => $bday,
	'recurrence' => array('FREQ' => 'YEARLY', 'INTERVAL' => 1),
	'free_busy' => 'free',
	);
	$event['end'] = clone $bday;
	$event['end']->add(new DateInterval('PT1H'));

	return $event;
	}
	}

	return null;
	}

	/**
	* Store alarm dismissal for birtual birthay events
	*
	* @param string Event identifier
	* @param integer Suspend the alarm for this number of seconds
	*/
	public function dismiss_birthday_alarm($event_id, $snooze = 0)
	{
	$rcmail = rcmail::get_instance();
	$cache = $rcmail->get_cache('calendar.birthdayalarms', 'db', 86400 * 30);
	$cache->remove($event_id);

	// compute new notification time or disable if not snoozed
	$notifyat = $snooze > 0 ? time() + $snooze : null;
	$cache->set($event_id, array('snooze' => $snooze, 'notifyat' => $notifyat));

	return true;
	}

	/**
	* Handler for user_delete plugin hook
	*
	* @param array Hash array with hook arguments
	* @return array Return arguments for plugin hooks
	*/
	public function user_delete($args)
	{
	// TO BE OVERRIDDEN
	return $args;
	}
	}
	diff --git a/plugins/calendar/drivers/kolab/kolab_calendar.php b/plugins/calendar/drivers/kolab/kolab_calendar.php
	index 850a12f6..d10126a6 100644
	--- a/plugins/calendar/drivers/kolab/kolab_calendar.php
	+++ b/plugins/calendar/drivers/kolab/kolab_calendar.php
	@@ -1,783 +1,783 @@
	<?php

	/**
	* Kolab calendar storage class
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2012-2014, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* 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/>.
	*/


	class kolab_calendar extends kolab_storage_folder_api
	{
	public $ready = false;
	public $readonly = true;
	public $attachments = true;
	public $alarms = false;
	public $history = false;
	public $subscriptions = true;
	public $categories = array();
	public $storage;

	public $type = 'event';

	protected $cal;
	protected $events = array();
	protected $search_fields = array('title', 'description', 'location', 'attendees');

	/**
	* Factory method to instantiate a kolab_calendar object
	*
	* @param string Calendar ID (encoded IMAP folder name)
	* @param object calendar plugin object
	* @return object kolab_calendar instance
	*/
	public static function factory($id, $calendar)
	{
	$imap = $calendar->rc->get_storage();
	$imap_folder = kolab_storage::id_decode($id);
	$info = $imap->folder_info($imap_folder, true);
	if (empty($info) \|\| $info['noselect'] \|\| strpos(kolab_storage::folder_type($imap_folder), 'event') !== 0) {
	return new kolab_user_calendar($imap_folder, $calendar);
	}
	else {
	return new kolab_calendar($imap_folder, $calendar);
	}
	}

	/**
	* Default constructor
	*/
	public function __construct($imap_folder, $calendar)
	{
	$this->cal = $calendar;
	$this->imap = $calendar->rc->get_storage();
	$this->name = $imap_folder;

	// ID is derrived from folder name
	$this->id = kolab_storage::folder_id($this->name, true);
	$old_id = kolab_storage::folder_id($this->name, false);

	// fetch objects from the given IMAP folder
	$this->storage = kolab_storage::get_folder($this->name);
	$this->ready = $this->storage && !PEAR::isError($this->storage) && $this->storage->type !== null;

	// Set readonly and alarms flags according to folder permissions
	if ($this->ready) {
	if ($this->storage->get_namespace() == 'personal') {
	$this->readonly = false;
	$this->alarms = true;
	}
	else {
	$rights = $this->storage->get_myrights();
	if ($rights && !PEAR::isError($rights)) {
	if (strpos($rights, 'i') !== false)
	$this->readonly = false;
	}
	}

	// user-specific alarms settings win
	$prefs = $this->cal->rc->config->get('kolab_calendars', array());
	if (isset($prefs[$this->id]['showalarms']))
	$this->alarms = $prefs[$this->id]['showalarms'];
	else if (isset($prefs[$old_id]['showalarms']))
	$this->alarms = $prefs[$old_id]['showalarms'];
	}

	$this->default = $this->storage->default;
	$this->subtype = $this->storage->subtype;
	}


	/**
	* Getter for the IMAP folder name
	*
	* @return string Name of the IMAP folder
	*/
	public function get_realname()
	{
	return $this->name;
	}

	/**
	*
	*/
	public function get_title()
	{
	return null;
	}


	/**
	* Return color to display this calendar
	*/
	public function get_color()
	{
	// color is defined in folder METADATA
	if ($color = $this->storage->get_color()) {
	return $color;
	}

	// calendar color is stored in user prefs (temporary solution)
	$prefs = $this->cal->rc->config->get('kolab_calendars', array());

	if (!empty($prefs[$this->id]) && !empty($prefs[$this->id]['color']))
	return $prefs[$this->id]['color'];

	return 'cc0000';
	}

	/**
	* Compose an URL for CalDAV access to this calendar (if configured)
	*/
	public function get_caldav_url()
	{
	if ($template = $this->cal->rc->config->get('calendar_caldav_url', null)) {
	return strtr($template, array(
	'%h' => $_SERVER['HTTP_HOST'],
	'%u' => urlencode($this->cal->rc->get_user_name()),
	'%i' => urlencode($this->storage->get_uid()),
	'%n' => urlencode($this->name),
	));
	}

	return false;
	}


	/**
	* Update properties of this calendar folder
	*
	* @see calendar_driver::edit_calendar()
	*/
	public function update(&$prop)
	{
	$prop['oldname'] = $this->get_realname();
	$newfolder = kolab_storage::folder_update($prop);

	if ($newfolder === false) {
	$this->cal->last_error = $this->cal->gettext(kolab_storage::$last_error);
	return false;
	}

	// create ID
	return kolab_storage::folder_id($newfolder);
	}

	/**
	* Getter for a single event object
	*/
	public function get_event($id)
	{
	// directly access storage object
	if (!$this->events[$id] && ($record = $this->storage->get_object($id)))
	$this->events[$id] = $this->_to_rcube_event($record);

	// event not found, maybe a recurring instance is requested
	if (!$this->events[$id]) {
	$master_id = preg_replace('/-\d+$/', '', $id);
	if ($master_id != $id && ($record = $this->storage->get_object($master_id)))
	$this->events[$master_id] = $this->_to_rcube_event($record);

	if (($master = $this->events[$master_id]) && $master['recurrence']) {
	- $this->_get_recurring_events($record, $master['start'], null, $id);
	+ $this->get_recurring_events($record, $master['start'], null, $id);
	}
	}

	return $this->events[$id];
	}


	/**
	* @param integer Event's new start (unix timestamp)
	* @param integer Event's new end (unix timestamp)
	* @param string Search query (optional)
	* @param boolean Include virtual events (optional)
	* @param array Additional parameters to query storage
	* @param array Additional query to filter events
	* @return array A list of event records
	*/
	public function list_events($start, $end, $search = null, $virtual = 1, $query = array(), $filter_query = null)
	{
	// convert to DateTime for comparisons
	try {
	$start = new DateTime('@'.$start);
	}
	catch (Exception $e) {
	$start = new DateTime('@0');
	}
	try {
	$end = new DateTime('@'.$end);
	}
	catch (Exception $e) {
	$end = new DateTime('today +10 years');
	}

	// get email addresses of the current user
	$user_emails = $this->cal->get_user_emails();

	// query Kolab storage
	$query[] = array('dtstart', '<=', $end);
	$query[] = array('dtend', '>=', $start);

	// add query to exclude pending/declined invitations
	if (empty($filter_query) && $this->get_namespace() != 'other') {
	foreach ($user_emails as $email) {
	$query[] = array('tags', '!=', 'x-partstat:' . $email . ':needs-action');
	$query[] = array('tags', '!=', 'x-partstat:' . $email . ':declined');
	}
	}
	else if (is_array($filter_query)) {
	$query = array_merge($query, $filter_query);
	}

	if (!empty($search)) {
	$search = mb_strtolower($search);
	foreach (rcube_utils::normalize_string($search, true) as $word) {
	$query[] = array('words', 'LIKE', $word);
	}
	}

	$events = array();
	foreach ($this->storage->select($query) as $record) {
	// post-filter events to skip pending and declined invitations
	if (empty($filter_query) && is_array($record['attendees']) && $this->get_namespace() != 'other') {
	foreach ($record['attendees'] as $attendee) {
	if (in_array($attendee['email'], $user_emails) && in_array($attendee['status'], array('NEEDS-ACTION','DECLINED'))) {
	continue 2;
	}
	}
	}

	$event = $this->_to_rcube_event($record);
	$this->events[$event['id']] = $event;

	// remember seen categories
	if ($event['categories'])
	$this->categories[$event['categories']]++;

	// filter events by search query
	if (!empty($search)) {
	$hit = false;
	foreach ($this->search_fields as $col) {
	$sval = is_array($event[$col]) ? self::_complex2string($event[$col]) : $event[$col];
	if (empty($sval))
	continue;

	// do a simple substring matching (to be improved)
	$val = mb_strtolower($sval);
	if (strpos($val, $search) !== false) {
	$hit = true;
	break;
	}
	}

	if (!$hit) // skip this event if not match with search term
	continue;
	}

	// list events in requested time window
	if ($event['start'] <= $end && $event['end'] >= $start) {
	unset($event['_attendees']);
	$add = true;

	// skip the first instance of a recurring event if listed in exdate
	if ($virtual && (!empty($event['recurrence']['EXDATE']) \|\| !empty($event['recurrence']['EXCEPTIONS']))) {
	$event_date = $event['start']->format('Ymd');
	$exdates = (array)$event['recurrence']['EXDATE'];

	// add dates from exceptions to list
	if (is_array($event['recurrence']['EXCEPTIONS'])) {
	foreach ($event['recurrence']['EXCEPTIONS'] as $exception) {
	$exdates[] = clone $exception['start'];
	}
	}

	foreach ($exdates as $exdate) {
	if ($exdate->format('Ymd') == $event_date) {
	$add = false;
	break;
	}
	}
	}

	if ($add)
	$events[] = $event;
	}

	// resolve recurring events
	if ($record['recurrence'] && $virtual == 1) {
	- $events = array_merge($events, $this->_get_recurring_events($record, $start, $end));
	+ $events = array_merge($events, $this->get_recurring_events($record, $start, $end));
	}
	}

	// avoid session race conditions that will loose temporary subscriptions
	$this->cal->rc->session->nowrite = true;

	return $events;
	}

	/**
	*
	* @param integer Date range start (unix timestamp)
	* @param integer Date range end (unix timestamp)
	* @param array Additional query to filter events
	* @return integer Count
	*/
	public function count_events($start, $end = null, $filter_query = null)
	{
	// convert to DateTime for comparisons
	try {
	$start = new DateTime('@'.$start);
	}
	catch (Exception $e) {
	$start = new DateTime('@0');
	}
	if ($end) {
	try {
	$end = new DateTime('@'.$end);
	}
	catch (Exception $e) {
	$end = null;
	}
	}

	// query Kolab storage
	$query[] = array('dtend', '>=', $start);

	if ($end)
	$query[] = array('dtstart', '<=', $end);

	// add query to exclude pending/declined invitations
	if (empty($filter_query)) {
	foreach ($this->cal->get_user_emails() as $email) {
	$query[] = array('tags', '!=', 'x-partstat:' . $email . ':needs-action');
	$query[] = array('tags', '!=', 'x-partstat:' . $email . ':declined');
	}
	}
	else if (is_array($filter_query)) {
	$query = array_merge($query, $filter_query);
	}

	// we rely the Kolab storage query (no post-filtering)
	return $this->storage->count($query);
	}

	/**
	* Create a new event record
	*
	* @see calendar_driver::new_event()
	*
	* @return mixed The created record ID on success, False on error
	*/
	public function insert_event($event)
	{
	if (!is_array($event))
	return false;

	// email links are stored separately
	$links = $event['links'];
	unset($event['links']);

	//generate new event from RC input
	$object = $this->_from_rcube_event($event);
	$saved = $this->storage->save($object, 'event');

	if (!$saved) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving event object to Kolab server"),
	true, false);
	$saved = false;
	}
	else {
	// save links in configuration.relation object
	$this->save_links($event['uid'], $links);

	$event['id'] = $event['uid'];
	$this->events = array($event['uid'] => $this->_to_rcube_event($object));
	}

	return $saved;
	}

	/**
	* Update a specific event record
	*
	* @see calendar_driver::new_event()
	* @return boolean True on success, False on error
	*/

	public function update_event($event, $exception_id = null)
	{
	$updated = false;
	$old = $this->storage->get_object($event['id']);
	if (!$old \|\| PEAR::isError($old))
	return false;

	// email links are stored separately
	$links = $event['links'];
	unset($event['links']);

	$object = $this->_from_rcube_event($event, $old);
	$saved = $this->storage->save($object, 'event', $event['id']);

	if (!$saved) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving event object to Kolab server"),
	true, false);
	}
	else {
	// save links in configuration.relation object
	$this->save_links($event['uid'], $links);

	$updated = true;
	$this->events[$event['id']] = $this->_to_rcube_event($object);

	// refresh local cache with recurring instances
	if ($exception_id) {
	- $this->_get_recurring_events($object, $event['start'], $event['end'], $exception_id);
	+ $this->get_recurring_events($object, $event['start'], $event['end'], $exception_id);
	}
	}

	return $updated;
	}

	/**
	* Delete an event record
	*
	* @see calendar_driver::remove_event()
	* @return boolean True on success, False on error
	*/
	public function delete_event($event, $force = true)
	{
	$deleted = $this->storage->delete($event['id'], $force);

	if (!$deleted) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error deleting event object from Kolab server"),
	true, false);
	}

	return $deleted;
	}

	/**
	* Restore deleted event record
	*
	* @see calendar_driver::undelete_event()
	* @return boolean True on success, False on error
	*/
	public function restore_event($event)
	{
	if ($this->storage->undelete($event['id'])) {
	return true;
	}
	else {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error undeleting the event object $event[id] from the Kolab server"),
	true, false);
	}

	return false;
	}

	/**
	* Find messages linked with an event
	*/
	protected function get_links($uid)
	{
	$storage = kolab_storage_config::get_instance();
	return $storage->get_object_links($uid);
	}

	/**
	*
	*/
	protected function save_links($uid, $links)
	{
	// make sure we have a valid array
	if (empty($links)) {
	$links = array();
	}

	$storage = kolab_storage_config::get_instance();
	$remove = array_diff($storage->get_object_links($uid), $links);
	return $storage->save_object_links($uid, $links, $remove);
	}

	/**
	* Create instances of a recurring event
	*
	* @param array Hash array with event properties
	* @param object DateTime Start date of the recurrence window
	* @param object DateTime End date of the recurrence window
	* @param string ID of a specific recurring event instance
	* @return array List of recurring event instances
	*/
	- public function _get_recurring_events($event, $start, $end = null, $event_id = null)
	+ public function get_recurring_events($event, $start, $end = null, $event_id = null)
	{
	$object = $event['_formatobj'];
	if (!$object) {
	$rec = $this->storage->get_object($event['id']);
	$object = $rec['_formatobj'];
	}
	if (!is_object($object))
	return array();

	// determine a reasonable end date if none given
	if (!$end) {
	switch ($event['recurrence']['FREQ']) {
	case 'YEARLY': $intvl = 'P100Y'; break;
	case 'MONTHLY': $intvl = 'P20Y'; break;
	default: $intvl = 'P10Y'; break;
	}

	$end = clone $event['start'];
	$end->add(new DateInterval($intvl));
	}

	// add recurrence exceptions to output
	$i = 0;
	$events = array();
	$exdates = array();
	$futuredata = array();
	if (is_array($event['recurrence']['EXCEPTIONS'])) {
	// copy the recurrence rule from the master event (to be used in the UI)
	$recurrence_rule = $event['recurrence'];
	unset($recurrence_rule['EXCEPTIONS'], $recurrence_rule['EXDATE']);

	foreach ($event['recurrence']['EXCEPTIONS'] as $exception) {
	$rec_event = $this->_to_rcube_event($exception);
	$rec_event['id'] = $event['uid'] . '-' . ++$i;
	$rec_event['recurrence_id'] = $event['uid'];
	$rec_event['recurrence'] = $recurrence_rule;
	$rec_event['_instance'] = $i;
	$rec_event['isexception'] = 1;
	$events[] = $rec_event;

	// found the specifically requested instance, exiting...
	if ($rec_event['id'] == $event_id) {
	$this->events[$rec_event['id']] = $rec_event;
	return $events;
	}

	// remember this exception's date
	$exdate = $rec_event['start']->format('Y-m-d');
	$exdates[$exdate] = $rec_event['id'];
	if ($rec_event['thisandfuture']) {
	$futuredata[$exdate] = $rec_event;
	}
	}
	}

	// use libkolab to compute recurring events
	if (class_exists('kolabcalendaring')) {
	$recurrence = new kolab_date_recurrence($object);
	}
	else {
	// fallback to local recurrence implementation
	require_once($this->cal->home . '/lib/calendar_recurrence.php');
	$recurrence = new calendar_recurrence($this->cal, $event);
	}

	while ($next_event = $recurrence->next_instance()) {
	// skip if there's an exception at this date
	$datestr = $next_event['start']->format('Y-m-d');
	if ($exdates[$datestr]) {
	// use this event data for future recurring instances
	if ($futuredata[$datestr])
	$overlay_data = $futuredata[$datestr];
	continue;
	}

	// add to output if in range
	$rec_id = $event['uid'] . '-' . ++$i;
	if (($next_event['start'] <= $end && $next_event['end'] >= $start) \|\| ($event_id && $rec_id == $event_id)) {
	$rec_event = $this->_to_rcube_event($next_event);

	if ($overlay_data) // copy data from a 'this-and-future' exception
	$this->_merge_event_data($rec_event, $overlay_data);

	$rec_event['id'] = $rec_id;
	$rec_event['recurrence_id'] = $event['uid'];
	$rec_event['_instance'] = $i;
	unset($rec_event['_attendees']);
	$events[] = $rec_event;

	if ($rec_id == $event_id) {
	$this->events[$rec_id] = $rec_event;
	break;
	}
	}
	else if ($next_event['start'] > $end) // stop loop if out of range
	break;

	// avoid endless recursion loops
	if ($i > 1000)
	break;
	}

	return $events;
	}

	/**
	* Merge certain properties from the overlay event to the base event object
	*
	* @param array The event object to be altered
	* @param array The overlay event object to be merged over $event
	*/
	private function _merge_event_data(&$event, $overlay)
	{
	static $forbidden = array('id','uid','created','changed','recurrence','organizer','attendees','sequence');

	foreach ($overlay as $prop => $value) {
	// adjust time of the recurring event instance
	if ($prop == 'start' \|\| $prop == 'end') {
	if (is_object($event[$prop]) && is_a($event[$prop], 'DateTime'))
	$event[$prop]->setTime($value->format('G'), intval($value->format('i')), intval($value->format('s')));
	}
	else if ($prop[0] != '_' && !in_array($prop, $forbidden))
	$event[$prop] = $value;
	}
	}

	/**
	* Convert from Kolab_Format to internal representation
	*/
	private function _to_rcube_event($record)
	{
	$record['id'] = $record['uid'];
	$record['calendar'] = $this->id;
	$record['links'] = $this->get_links($record['uid']);

	if ($this->get_namespace() == 'other') {
	$record['className'] = 'fc-event-ns-other';
	$record = kolab_driver::add_partstat_class($record, array('NEEDS-ACTION','DECLINED'), $this->get_owner());
	}

	return kolab_driver::to_rcube_event($record);
	}

	/**
	* Convert the given event record into a data structure that can be passed to Kolab_Storage backend for saving
	* (opposite of self::_to_rcube_event())
	*/
	private function _from_rcube_event($event, $old = array())
	{
	// in kolab_storage attachments are indexed by content-id
	$event['_attachments'] = array();
	if (is_array($event['attachments'])) {
	foreach ($event['attachments'] as $attachment) {
	$key = null;
	// Roundcube ID has nothing to do with the storage ID, remove it
	if ($attachment['content'] \|\| $attachment['path']) {
	unset($attachment['id']);
	}
	else {
	foreach ((array)$old['_attachments'] as $cid => $oldatt) {
	if ($attachment['id'] == $oldatt['id'])
	$key = $cid;
	}
	}

	// flagged for deletion => set to false
	if ($attachment['_deleted']) {
	$event['_attachments'][$key] = false;
	}
	// replace existing entry
	else if ($key) {
	$event['_attachments'][$key] = $attachment;
	}
	// append as new attachment
	else {
	$event['_attachments'][] = $attachment;
	}
	}

	unset($event['attachments']);
	}

	// set current user as ORGANIZER
	$identity = $this->cal->rc->user->list_emails(true);
	if (empty($event['attendees']) && $identity['email'])
	$event['attendees'] = array(array('role' => 'ORGANIZER', 'name' => $identity['name'], 'email' => $identity['email']));

	$event['_owner'] = $identity['email'];

	// remove EXDATE values if RDATE is given
	if (!empty($event['recurrence']['RDATE'])) {
	$event['recurrence']['EXDATE'] = array();
	}

	// remove recurrence information (e.g. EXDATES and EXCEPTIONS) entirely
	if ($event['recurrence'] && empty($event['recurrence']['FREQ']) && empty($event['recurrence']['RDATE'])) {
	$event['recurrence'] = array();
	}

	// keep 'comment' from initial itip invitation
	if (!empty($old['comment'])) {
	$event['comment'] = $old['comment'];
	}

	// remove some internal properties which should not be saved
	unset($event['_savemode'], $event['_fromcalendar'], $event['_identity'], $event['_folder_id'], $event['className']);

	// copy meta data (starting with _) from old object
	foreach ((array)$old as $key => $val) {
	if (!isset($event[$key]) && $key[0] == '_')
	$event[$key] = $val;
	}

	return $event;
	}

	/**
	* Convert a complex event attribute to a string value
	*/
	private static function _complex2string($prop)
	{
	static $ignorekeys = array('role','status','rsvp');

	$out = '';
	if (is_array($prop)) {
	foreach ($prop as $key => $val) {
	if (is_numeric($key)) {
	$out .= self::_complex2string($val);
	}
	else if (!in_array($key, $ignorekeys)) {
	$out .= $val . ' ';
	}
	}
	}
	else if (is_string($prop) \|\| is_numeric($prop)) {
	$out .= $prop . ' ';
	}

	return rtrim($out);
	}

	}
	diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
	index 8a484055..b53ffbf2 100644
	--- a/plugins/calendar/drivers/kolab/kolab_driver.php
	+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
	@@ -1,1870 +1,1892 @@
	<?php

	/**
	* Kolab driver for the Calendar plugin
	*
	* @version @package_version@
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2012-2014, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* 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/>.
	*/

	class kolab_driver extends calendar_driver
	{
	const INVITATIONS_CALENDAR_PENDING = '--invitation--pending';
	const INVITATIONS_CALENDAR_DECLINED = '--invitation--declined';

	// features this backend supports
	public $alarms = true;
	public $attendees = true;
	public $freebusy = true;
	public $attachments = true;
	public $undelete = true;
	public $alarm_types = array('DISPLAY','AUDIO');
	public $categoriesimmutable = true;

	private $rc;
	private $cal;
	private $calendars;
	private $has_writeable = false;
	private $freebusy_trigger = false;
	private $bonnie_api = false;

	/**
	* Default constructor
	*/
	public function __construct($cal)
	{
	$cal->require_plugin('libkolab');

	// load helper classes after libkolab has been loaded (#3248)
	require_once(dirname(__FILE__) . '/kolab_calendar.php');
	require_once(dirname(__FILE__) . '/kolab_user_calendar.php');
	require_once(dirname(__FILE__) . '/kolab_invitation_calendar.php');

	$this->cal = $cal;
	$this->rc = $cal->rc;
	$this->_read_calendars();

	$this->cal->register_action('push-freebusy', array($this, 'push_freebusy'));
	$this->cal->register_action('calendar-acl', array($this, 'calendar_acl'));

	$this->freebusy_trigger = $this->rc->config->get('calendar_freebusy_trigger', false);

	if (kolab_storage::$version == '2.0') {
	$this->alarm_types = array('DISPLAY');
	$this->alarm_absolute = false;
	}

	// get configuration for the Bonnie API
	if ($bonnie_config = $this->cal->rc->config->get('kolab_bonnie_api', false))
	$this->bonnie_api = new kolab_bonnie_api($bonnie_config);

	// calendar uses fully encoded identifiers
	kolab_storage::$encode_ids = true;
	}


	/**
	* Read available calendars from server
	*/
	private function _read_calendars()
	{
	// already read sources
	if (isset($this->calendars))
	return $this->calendars;

	// get all folders that have "event" type, sorted by namespace/name
	$folders = kolab_storage::sort_folders(kolab_storage::get_folders('event') + kolab_storage::get_user_folders('event', true));
	$this->calendars = array();

	foreach ($folders as $folder) {
	if ($folder instanceof kolab_storage_folder_user) {
	$calendar = new kolab_user_calendar($folder->name, $this->cal);
	$calendar->subscriptions = count($folder->children) > 0;
	}
	else {
	$calendar = new kolab_calendar($folder->name, $this->cal);
	}

	if ($calendar->ready) {
	$this->calendars[$calendar->id] = $calendar;
	if (!$calendar->readonly)
	$this->has_writeable = true;
	}
	}

	return $this->calendars;
	}

	/**
	* Get a list of available calendars from this source
	*
	* @param bool $active Return only active calendars
	* @param bool $personal Return only personal calendars
	* @param object $tree Reference to hierarchical folder tree object
	*
	* @return array List of calendars
	*/
	public function list_calendars($active = false, $personal = false, &$tree = null)
	{
	// attempt to create a default calendar for this user
	if (!$this->has_writeable) {
	if ($this->create_calendar(array('name' => 'Calendar', 'color' => 'cc0000'))) {
	unset($this->calendars);
	$this->_read_calendars();
	}
	}

	$delim = $this->rc->get_storage()->get_hierarchy_delimiter();
	$folders = $this->filter_calendars(false, $active, $personal);
	$calendars = array();

	// include virtual folders for a full folder tree
	if (!is_null($tree))
	$folders = kolab_storage::folder_hierarchy($folders, $tree);

	foreach ($folders as $id => $cal) {
	$fullname = $cal->get_name();
	$listname = $cal->get_foldername();
	$imap_path = explode($delim, $cal->name);

	// find parent
	do {
	array_pop($imap_path);
	$parent_id = kolab_storage::folder_id(join($delim, $imap_path));
	}
	while (count($imap_path) > 1 && !$this->calendars[$parent_id]);

	// restore "real" parent ID
	if ($parent_id && !$this->calendars[$parent_id]) {
	$parent_id = kolab_storage::folder_id($cal->get_parent());
	}

	// turn a kolab_storage_folder object into a kolab_calendar
	if ($cal instanceof kolab_storage_folder) {
	$cal = new kolab_calendar($cal->name, $this->cal);
	$this->calendars[$cal->id] = $cal;
	}

	// special handling for user or virtual folders
	if ($cal instanceof kolab_storage_folder_user) {
	$calendars[$cal->id] = array(
	'id' => $cal->id,
	'name' => kolab_storage::object_name($fullname),
	'listname' => $listname,
	'editname' => $cal->get_foldername(),
	'color' => $cal->get_color(),
	'active' => $cal->is_active(),
	'title' => $cal->get_owner(),
	'owner' => $cal->get_owner(),
	'history' => false,
	'virtual' => false,
	'readonly' => true,
	'group' => 'other',
	'class' => 'user',
	'removable' => true,
	);
	}
	else if ($cal->virtual) {
	$calendars[$cal->id] = array(
	'id' => $cal->id,
	'name' => $fullname,
	'listname' => $listname,
	'editname' => $cal->get_foldername(),
	'virtual' => true,
	'readonly' => true,
	'group' => $cal->get_namespace(),
	'class' => 'folder',
	);
	}
	else {
	$calendars[$cal->id] = array(
	'id' => $cal->id,
	'name' => $fullname,
	'listname' => $listname,
	'editname' => $cal->get_foldername(),
	'title' => $cal->get_title(),
	'color' => $cal->get_color(),
	'readonly' => $cal->readonly,
	'showalarms' => $cal->alarms,
	'history' => !empty($this->bonnie_api),
	'group' => $cal->get_namespace(),
	'default' => $cal->default,
	'active' => $cal->is_active(),
	'owner' => $cal->get_owner(),
	'children' => true, // TODO: determine if that folder indeed has child folders
	'parent' => $parent_id,
	'subtype' => $cal->subtype,
	'caldavurl' => $cal->get_caldav_url(),
	'removable' => !$cal->default,
	);
	}

	if ($cal->subscriptions) {
	$calendars[$cal->id]['subscribed'] = $cal->is_subscribed();
	}
	}

	// list virtual calendars showing invitations
	if ($this->rc->config->get('kolab_invitation_calendars')) {
	foreach (array(self::INVITATIONS_CALENDAR_PENDING, self::INVITATIONS_CALENDAR_DECLINED) as $id) {
	$cal = new kolab_invitation_calendar($id, $this->cal);
	$this->calendars[$cal->id] = $cal;
	if (!$active \|\| $cal->is_active()) {
	$calendars[$id] = array(
	'id' => $cal->id,
	'name' => $cal->get_name(),
	'listname' => $cal->get_name(),
	'editname' => $cal->get_foldername(),
	'title' => $cal->get_title(),
	'color' => $cal->get_color(),
	'readonly' => $cal->readonly,
	'showalarms' => $cal->alarms,
	'history' => !empty($this->bonnie_api),
	'group' => 'x-invitations',
	'default' => false,
	'active' => $cal->is_active(),
	'owner' => $cal->get_owner(),
	'children' => false,
	);

	if ($id == self::INVITATIONS_CALENDAR_PENDING) {
	$calendars[$id]['counts'] = true;
	}

	if (is_object($tree)) {
	$tree->children[] = $cal;
	}
	}
	}
	}

	// append the virtual birthdays calendar
	if ($this->rc->config->get('calendar_contact_birthdays', false)) {
	$id = self::BIRTHDAY_CALENDAR_ID;
	$prefs = $this->rc->config->get('kolab_calendars', array()); // read local prefs
	if (!$active \|\| $prefs[$id]['active']) {
	$calendars[$id] = array(
	'id' => $id,
	'name' => $this->cal->gettext('birthdays'),
	'listname' => $this->cal->gettext('birthdays'),
	'color' => $prefs[$id]['color'] ?: '87CEFA',
	'active' => (bool)$prefs[$id]['active'],
	'showalarms' => (bool)$this->rc->config->get('calendar_birthdays_alarm_type'),
	'group' => 'x-birthdays',
	'readonly' => true,
	'default' => false,
	'children' => false,
	'history' => false,
	);
	}
	}

	return $calendars;
	}

	/**
	* Get list of calendars according to specified filters
	*
	* @param bool $writeable Return only writeable calendars
	* @param bool $active Return only active calendars
	* @param bool $personal Return only personal calendars
	*
	* @return array List of calendars
	*/
	protected function filter_calendars($writeable = false, $active = false, $personal = false)
	{
	$calendars = array();

	$plugin = $this->rc->plugins->exec_hook('calendar_list_filter', array(
	'list' => $this->calendars, 'calendars' => $calendars,
	'writeable' => $writeable, 'active' => $active, 'personal' => $personal,
	));

	if ($plugin['abort']) {
	return $plugin['calendars'];
	}

	foreach ($this->calendars as $cal) {
	if (!$cal->ready) {
	continue;
	}
	if ($writeable && $cal->readonly) {
	continue;
	}
	if ($active && !$cal->is_active()) {
	continue;
	}
	if ($personal && $cal->get_namespace() != 'personal') {
	continue;
	}
	$calendars[$cal->id] = $cal;
	}

	return $calendars;
	}


	/**
	* Get the kolab_calendar instance for the given calendar ID
	*
	* @param string Calendar identifier (encoded imap folder name)
	* @return object kolab_calendar Object nor null if calendar doesn't exist
	*/
	public function get_calendar($id)
	{
	// create calendar object if necesary
	if (!$this->calendars[$id] && in_array($id, array(self::INVITATIONS_CALENDAR_PENDING, self::INVITATIONS_CALENDAR_DECLINED))) {
	$this->calendars[$id] = new kolab_invitation_calendar($id, $this->cal);
	}
	else if (!$this->calendars[$id] && $id !== self::BIRTHDAY_CALENDAR_ID) {
	$calendar = kolab_calendar::factory($id, $this->cal);
	if ($calendar->ready)
	$this->calendars[$calendar->id] = $calendar;
	}

	return $this->calendars[$id];
	}

	/**
	* Create a new calendar assigned to the current user
	*
	* @param array Hash array with calendar properties
	* name: Calendar name
	* color: The color of the calendar
	* @return mixed ID of the calendar on success, False on error
	*/
	public function create_calendar($prop)
	{
	$prop['type'] = 'event';
	$prop['active'] = true;
	$prop['subscribed'] = true;
	$folder = kolab_storage::folder_update($prop);

	if ($folder === false) {
	$this->last_error = $this->cal->gettext(kolab_storage::$last_error);
	return false;
	}

	// create ID
	$id = kolab_storage::folder_id($folder);

	// save color in user prefs (temp. solution)
	$prefs['kolab_calendars'] = $this->rc->config->get('kolab_calendars', array());

	if (isset($prop['color']))
	$prefs['kolab_calendars'][$id]['color'] = $prop['color'];
	if (isset($prop['showalarms']))
	$prefs['kolab_calendars'][$id]['showalarms'] = $prop['showalarms'] ? true : false;

	if ($prefs['kolab_calendars'][$id])
	$this->rc->user->save_prefs($prefs);

	return $id;
	}


	/**
	* Update properties of an existing calendar
	*
	* @see calendar_driver::edit_calendar()
	*/
	public function edit_calendar($prop)
	{
	if ($prop['id'] && ($cal = $this->get_calendar($prop['id']))) {
	$id = $cal->update($prop);
	}
	else {
	$id = $prop['id'];
	}

	// fallback to local prefs
	$prefs['kolab_calendars'] = $this->rc->config->get('kolab_calendars', array());
	unset($prefs['kolab_calendars'][$prop['id']]['color'], $prefs['kolab_calendars'][$prop['id']]['showalarms']);

	if (isset($prop['color']))
	$prefs['kolab_calendars'][$id]['color'] = $prop['color'];

	if (isset($prop['showalarms']) && $id == self::BIRTHDAY_CALENDAR_ID)
	$prefs['calendar_birthdays_alarm_type'] = $prop['showalarms'] ? $this->alarm_types[0] : '';
	else if (isset($prop['showalarms']))
	$prefs['kolab_calendars'][$id]['showalarms'] = $prop['showalarms'] ? true : false;

	if (!empty($prefs['kolab_calendars'][$id]))
	$this->rc->user->save_prefs($prefs);

	return true;
	}


	/**
	* Set active/subscribed state of a calendar
	*
	* @see calendar_driver::subscribe_calendar()
	*/
	public function subscribe_calendar($prop)
	{
	if ($prop['id'] && ($cal = $this->get_calendar($prop['id'])) && is_object($cal->storage)) {
	$ret = false;
	if (isset($prop['permanent']))
	$ret \|= $cal->storage->subscribe(intval($prop['permanent']));
	if (isset($prop['active']))
	$ret \|= $cal->storage->activate(intval($prop['active']));

	// apply to child folders, too
	if ($prop['recursive']) {
	foreach ((array)kolab_storage::list_folders($cal->storage->name, '*', 'event') as $subfolder) {
	if (isset($prop['permanent']))
	($prop['permanent'] ? kolab_storage::folder_subscribe($subfolder) : kolab_storage::folder_unsubscribe($subfolder));
	if (isset($prop['active']))
	($prop['active'] ? kolab_storage::folder_activate($subfolder) : kolab_storage::folder_deactivate($subfolder));
	}
	}
	return $ret;
	}
	else {
	// save state in local prefs
	$prefs['kolab_calendars'] = $this->rc->config->get('kolab_calendars', array());
	$prefs['kolab_calendars'][$prop['id']]['active'] = (bool)$prop['active'];
	$this->rc->user->save_prefs($prefs);
	return true;
	}

	return false;
	}


	/**
	* Delete the given calendar with all its contents
	*
	* @see calendar_driver::delete_calendar()
	*/
	public function delete_calendar($prop)
	{
	if ($prop['id'] && ($cal = $this->get_calendar($prop['id']))) {
	$folder = $cal->get_realname();
	// TODO: unsubscribe if no admin rights
	if (kolab_storage::folder_delete($folder)) {
	// remove color in user prefs (temp. solution)
	$prefs['kolab_calendars'] = $this->rc->config->get('kolab_calendars', array());
	unset($prefs['kolab_calendars'][$prop['id']]);

	$this->rc->user->save_prefs($prefs);
	return true;
	}
	else
	$this->last_error = kolab_storage::$last_error;
	}

	return false;
	}


	/**
	* Search for shared or otherwise not listed calendars the user has access
	*
	* @param string Search string
	* @param string Section/source to search
	* @return array List of calendars
	*/
	public function search_calendars($query, $source)
	{
	if (!kolab_storage::setup())
	return array();

	$this->calendars = array();
	$this->search_more_results = false;

	// find unsubscribed IMAP folders that have "event" type
	if ($source == 'folders') {
	foreach ((array)kolab_storage::search_folders('event', $query, array('other')) as $folder) {
	$calendar = new kolab_calendar($folder->name, $this->cal);
	$this->calendars[$calendar->id] = $calendar;
	}
	}
	// find other user's virtual calendars
	else if ($source == 'users') {
	$limit = $this->rc->config->get('autocomplete_max', 15) * 2; // we have slightly more space, so display twice the number
	foreach (kolab_storage::search_users($query, 0, array(), $limit, $count) as $user) {
	$calendar = new kolab_user_calendar($user, $this->cal);
	$this->calendars[$calendar->id] = $calendar;

	// search for calendar folders shared by this user
	foreach (kolab_storage::list_user_folders($user, 'event', false) as $foldername) {
	$cal = new kolab_calendar($foldername, $this->cal);
	$this->calendars[$cal->id] = $cal;
	$calendar->subscriptions = true;
	}
	}

	if ($count > $limit) {
	$this->search_more_results = true;
	}
	}

	// don't list the birthday calendar
	$this->rc->config->set('calendar_contact_birthdays', false);
	$this->rc->config->set('kolab_invitation_calendars', false);

	return $this->list_calendars();
	}


	/**
	* Fetch a single event
	*
	* @see calendar_driver::get_event()
	* @return array Hash array with event properties, false if not found
	*/
	public function get_event($event, $writeable = false, $active = false, $personal = false)
	{
	if (is_array($event)) {
	$id = $event['id'] ? $event['id'] : $event['uid'];
	$cal = $event['calendar'];
	}
	else {
	$id = $event;
	}

	if ($cal) {
	if ($storage = $this->get_calendar($cal)) {
	return $storage->get_event($id);
	}
	// get event from the address books birthday calendar
	else if ($cal == self::BIRTHDAY_CALENDAR_ID) {
	return $this->get_birthday_event($id);
	}
	}
	// iterate over all calendar folders and search for the event ID
	else {
	foreach ($this->filter_calendars($writeable, $active, $personal) as $calendar) {
	if ($result = $calendar->get_event($id)) {
	return $result;
	}
	}
	}

	return false;
	}

	/**
	* Add a single event to the database
	*
	* @see calendar_driver::new_event()
	*/
	public function new_event($event)
	{
	if (!$this->validate($event))
	return false;

	$cid = $event['calendar'] ? $event['calendar'] : reset(array_keys($this->calendars));
	if ($storage = $this->get_calendar($cid)) {
	// handle attachments to add
	if (!empty($event['attachments'])) {
	foreach ($event['attachments'] as $idx => $attachment) {
	// we'll read file contacts into memory, Horde/Kolab classes does the same
	// So we cannot save memory, rcube_imap class can do this better
	$event['attachments'][$idx]['content'] = $attachment['data'] ? $attachment['data'] : file_get_contents($attachment['path']);
	}
	}

	$success = $storage->insert_event($event);

	if ($success && $this->freebusy_trigger) {
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));
	$this->freebusy_trigger = false; // disable after first execution (#2355)
	}

	return $success;
	}

	return false;
	}

	/**
	* Update an event entry with the given data
	*
	* @see calendar_driver::new_event()
	* @return boolean True on success, False on error
	*/
	public function edit_event($event)
	{
	return $this->update_event($event);
	}

	/**
	* Extended event editing with possible changes to the argument
	*
	* @param array Hash array with event properties
	* @param string New participant status
	* @return boolean True on success, False on error
	*/
	public function edit_rsvp(&$event, $status)
	{
	if (($ret = $this->update_event($event)) && $this->rc->config->get('kolab_invitation_calendars')) {
	// re-assign to the according (virtual) calendar
	if (strtoupper($status) == 'DECLINED')
	$event['calendar'] = self::INVITATIONS_CALENDAR_DECLINED;
	else if (strtoupper($status) == 'NEEDS-ACTION')
	$event['calendar'] = self::INVITATIONS_CALENDAR_PENDING;
	else if ($event['_folder_id'])
	$event['calendar'] = $event['_folder_id'];
	}

	return $ret;
	}


	/**
	* Move a single event
	*
	* @see calendar_driver::move_event()
	* @return boolean True on success, False on error
	*/
	public function move_event($event)
	{
	if (($storage = $this->get_calendar($event['calendar'])) && ($ev = $storage->get_event($event['id']))) {
	unset($ev['sequence']);
	return $this->update_event($event + $ev);
	}

	return false;
	}

	/**
	* Resize a single event
	*
	* @see calendar_driver::resize_event()
	* @return boolean True on success, False on error
	*/
	public function resize_event($event)
	{
	if (($storage = $this->get_calendar($event['calendar'])) && ($ev = $storage->get_event($event['id']))) {
	unset($ev['sequence']);
	return $this->update_event($event + $ev);
	}

	return false;
	}

	/**
	* Remove a single event
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	* @param boolean Remove record(s) irreversible (mark as deleted otherwise)
	*
	* @return boolean True on success, False on error
	*/
	public function remove_event($event, $force = true)
	{
	$success = false;
	$savemode = $event['_savemode'];
	$decline = $event['decline'];

	if (($storage = $this->get_calendar($event['calendar'])) && ($event = $storage->get_event($event['id']))) {
	$event['_savemode'] = $savemode;
	$savemode = 'all';
	$master = $event;

	$this->rc->session->remove('calendar_restore_event_data');

	// read master if deleting a recurring event
	if ($event['recurrence'] \|\| $event['recurrence_id']) {
	$master = $event['recurrence_id'] ? $storage->get_event($event['recurrence_id']) : $event;
	$savemode = $event['_savemode'];
	}

	// removing an exception instance
	if ($event['recurrence_id']) {
	$i = $event['_instance'] - 1;
	if (!empty($master['recurrence']['EXCEPTIONS'][$i])) {
	unset($master['recurrence']['EXCEPTIONS'][$i]);
	}
	}

	switch ($savemode) {
	case 'current':
	$_SESSION['calendar_restore_event_data'] = $master;

	// removing the first instance => just move to next occurence
	if ($master['id'] == $event['id']) {
	- $recurring = reset($storage->_get_recurring_events($event, $event['start'], null, $event['id'].'-1'));
	+ $recurring = reset($storage->get_recurring_events($event, $event['start'], null, $event['id'].'-1'));

	// no future instances found: delete the master event (bug #1677)
	if (!$recurring['start']) {
	$success = $storage->delete_event($master, $force);
	break;
	}

	$master['start'] = $recurring['start'];
	$master['end'] = $recurring['end'];
	if ($master['recurrence']['COUNT'])
	$master['recurrence']['COUNT']--;
	}
	// remove the matching RDATE entry
	else if ($master['recurrence']['RDATE']) {
	foreach ($master['recurrence']['RDATE'] as $j => $rdate) {
	if ($rdate->format('Ymd') == $event['start']->format('Ymd')) {
	unset($master['recurrence']['RDATE'][$j]);
	break;
	}
	}
	}
	else { // add exception to master event
	$master['recurrence']['EXDATE'][] = $event['start'];
	}
	$success = $storage->update_event($master);
	break;

	case 'future':
	if ($master['id'] != $event['id']) {
	$_SESSION['calendar_restore_event_data'] = $master;

	// set until-date on master event
	$master['recurrence']['UNTIL'] = clone $event['start'];
	$master['recurrence']['UNTIL']->sub(new DateInterval('P1D'));
	unset($master['recurrence']['COUNT']);

	// if all future instances are deleted, remove recurrence rule entirely (bug #1677)
	if ($master['recurrence']['UNTIL']->format('Ymd') == $master['start']->format('Ymd')) {
	$master['recurrence'] = array();
	}
	// remove matching RDATE entries
	else if ($master['recurrence']['RDATE']) {
	foreach ($master['recurrence']['RDATE'] as $j => $rdate) {
	if ($rdate->format('Ymd') == $event['start']->format('Ymd')) {
	$master['recurrence']['RDATE'] = array_slice($master['recurrence']['RDATE'], 0, $j);
	break;
	}
	}
	}

	$success = $storage->update_event($master);
	break;
	}

	default: // 'all' is default
	if ($decline && $this->rc->config->get('kolab_invitation_calendars')) {
	// don't delete but set PARTSTAT=DECLINED
	if ($this->cal->lib->set_partstat($master, 'DECLINED')) {
	$success = $storage->update_event($master);
	}
	}

	if (!$success)
	$success = $storage->delete_event($master, $force);
	break;
	}
	}

	if ($success && $this->freebusy_trigger)
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));

	return $success;
	}

	/**
	* Restore a single deleted event
	*
	* @param array Hash array with event properties:
	* id: Event identifier
	* @return boolean True on success, False on error
	*/
	public function restore_event($event)
	{
	if ($storage = $this->get_calendar($event['calendar'])) {
	if (!empty($_SESSION['calendar_restore_event_data']))
	$success = $storage->update_event($_SESSION['calendar_restore_event_data']);
	else
	$success = $storage->restore_event($event);

	if ($success && $this->freebusy_trigger)
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));

	return $success;
	}

	return false;
	}

	/**
	* Wrapper to update an event object depending on the given savemode
	*/
	private function update_event($event)
	{
	if (!($storage = $this->get_calendar($event['calendar'])))
	return false;

	// move event to another folder/calendar
	if ($event['_fromcalendar'] && $event['_fromcalendar'] != $event['calendar']) {
	if (!($fromcalendar = $this->get_calendar($event['_fromcalendar'])))
	return false;

	if ($event['_savemode'] != 'new') {
	if (!$fromcalendar->storage->move($event['id'], $storage->storage))
	return false;

	$fromcalendar = $storage;
	}
	}
	else
	$fromcalendar = $storage;

	$success = false;
	$savemode = 'all';
	$attachments = array();
	$old = $master = $fromcalendar->get_event($event['id']);

	if (!$old \|\| !$old['start']) {
	rcube::raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Failed to load event object to update: id=" . $event['id']),
	true, false);
	return false;
	}

	// delete existing attachment(s)
	if (!empty($event['deleted_attachments'])) {
	foreach ($event['deleted_attachments'] as $attachment) {
	if (!empty($old['attachments'])) {
	foreach ($old['attachments'] as $idx => $att) {
	if ($att['id'] == $attachment) {
	$old['attachments'][$idx]['_deleted'] = true;
	}
	}
	}
	}
	unset($event['deleted_attachments']);
	}

	// handle attachments to add
	if (!empty($event['attachments'])) {
	foreach ($event['attachments'] as $attachment) {
	// skip entries without content (could be existing ones)
	if (!$attachment['data'] && !$attachment['path'])
	continue;

	$attachments[] = array(
	'name' => $attachment['name'],
	'mimetype' => $attachment['mimetype'],
	'content' => $attachment['data'],
	'path' => $attachment['path'],
	);
	}
	}

	$event['attachments'] = array_merge((array)$old['attachments'], $attachments);

	// modify a recurring event, check submitted savemode to do the right things
	if ($old['recurrence'] \|\| $old['recurrence_id']) {
	$master = $old['recurrence_id'] ? $fromcalendar->get_event($old['recurrence_id']) : $old;
	$savemode = $event['_savemode'];
	}

	// keep saved exceptions (not submitted by the client)
	if ($old['recurrence']['EXDATE'])
	$event['recurrence']['EXDATE'] = $old['recurrence']['EXDATE'];
	if ($old['recurrence']['EXCEPTIONS'])
	$event['recurrence']['EXCEPTIONS'] = $old['recurrence']['EXCEPTIONS'];

	switch ($savemode) {
	case 'new':
	// save submitted data as new (non-recurring) event
	$event['recurrence'] = array();
	$event['uid'] = $this->cal->generate_uid();
	unset($event['recurrence_id'], $event['id'], $event['_savemode'], $event['_fromcalendar'], $event['_identity'], $event['_notify']);

	// copy attachment data to new event
	foreach ((array)$event['attachments'] as $idx => $attachment) {
	if (!$attachment['content'])
	$event['attachments'][$idx]['content'] = $this->get_attachment_body($attachment['id'], $master);
	}

	if ($success = $storage->insert_event($event))
	$success = $event['uid'];
	break;

	case 'future':
	case 'current':
	// recurring instances shall not store recurrence rules
	$event['recurrence'] = array();
	$event['thisandfuture'] = $savemode == 'future';

	// remove some internal properties which should not be saved
	unset($event['_savemode'], $event['_fromcalendar'], $event['_identity'], $event['_notify']);

	// save properties to a recurrence exception instance
	if ($old['recurrence_id']) {
	$i = $old['_instance'] - 1;
	if (!empty($master['recurrence']['EXCEPTIONS'][$i])) {
	$master['recurrence']['EXCEPTIONS'][$i] = $event;
	$success = $storage->update_event($master, $old['id']);
	break;
	}
	}

	$add_exception = true;

	// adjust matching RDATE entry if dates changed
	if ($savemode == 'current' && $master['recurrence']['RDATE'] && ($old_date = $old['start']->format('Ymd')) != $event['start']->format('Ymd')) {
	foreach ($master['recurrence']['RDATE'] as $j => $rdate) {
	if ($rdate->format('Ymd') == $old_date) {
	$master['recurrence']['RDATE'][$j] = $event['start'];
	sort($master['recurrence']['RDATE']);
	$add_exception = false;
	break;
	}
	}
	}

	// save as new exception to master event
	if ($add_exception) {
	$master['recurrence']['EXCEPTIONS'][] = $event;
	}
	$success = $storage->update_event($master);
	break;

	default: // 'all' is default
	$event['id'] = $master['id'];
	$event['uid'] = $master['uid'];

	// use start date from master but try to be smart on time or duration changes
	$old_start_date = $old['start']->format('Y-m-d');
	$old_start_time = $old['allday'] ? '' : $old['start']->format('H:i');
	$old_duration = $old['end']->format('U') - $old['start']->format('U');

	$new_start_date = $event['start']->format('Y-m-d');
	$new_start_time = $event['allday'] ? '' : $event['start']->format('H:i');
	$new_duration = $event['end']->format('U') - $event['start']->format('U');

	$diff = $old_start_date != $new_start_date \|\| $old_start_time != $new_start_time \|\| $old_duration != $new_duration;

	// shifted or resized
	if ($diff && ($old_start_date == $new_start_date \|\| $old_duration == $new_duration)) {
	$event['start'] = $master['start']->add($old['start']->diff($event['start']));
	$event['end'] = clone $event['start'];
	$event['end']->add(new DateInterval('PT'.$new_duration.'S'));

	// remove fixed weekday, will be re-set to the new weekday in kolab_calendar::update_event()
	if ($old_start_date != $new_start_date) {
	if (strlen($event['recurrence']['BYDAY']) == 2)
	unset($event['recurrence']['BYDAY']);
	if ($old['recurrence']['BYMONTH'] == $old['start']->format('n'))
	unset($event['recurrence']['BYMONTH']);
	}
	}
	// dates did not change, use the ones from master
	else if ($event['start'] == $old['start'] && $event['end'] == $old['end']) {
	$event['start'] = $master['start'];
	$event['end'] = $master['end'];
	}

	// unset _dateonly flags in (cached) date objects
	unset($event['start']->_dateonly, $event['end']->_dateonly);

	$success = $storage->update_event($event);
	break;
	}

	if ($success && $this->freebusy_trigger)
	$this->rc->output->command('plugin.ping_url', array('action' => 'calendar/push-freebusy', 'source' => $storage->id));

	return $success;
	}

	/**
	* Get events from source.
	*
	* @param integer Event's new start (unix timestamp)
	* @param integer Event's new end (unix timestamp)
	* @param string Search query (optional)
	* @param mixed List of calendar IDs to load events from (either as array or comma-separated string)
	* @param boolean Include virtual events (optional)
	* @param integer Only list events modified since this time (unix timestamp)
	* @return array A list of event records
	*/
	public function load_events($start, $end, $search = null, $calendars = null, $virtual = 1, $modifiedsince = null)
	{
	if ($calendars && is_string($calendars))
	$calendars = explode(',', $calendars);
	else if (!$calendars)
	$calendars = array_keys($this->calendars);

	$query = array();
	if ($modifiedsince)
	$query[] = array('changed', '>=', $modifiedsince);

	$events = $categories = array();
	foreach ($calendars as $cid) {
	if ($storage = $this->get_calendar($cid)) {
	$events = array_merge($events, $storage->list_events($start, $end, $search, $virtual, $query));
	$categories += $storage->categories;
	}
	}

	// add events from the address books birthday calendar
	if (in_array(self::BIRTHDAY_CALENDAR_ID, $calendars)) {
	$events = array_merge($events, $this->load_birthday_events($start, $end, $search, $modifiedsince));
	}

	// add new categories to user prefs
	$old_categories = $this->rc->config->get('calendar_categories', $this->default_categories);
	if ($newcats = array_udiff(array_keys($categories), array_keys($old_categories), function($a, $b){ return strcasecmp($a, $b); })) {
	foreach ($newcats as $category)
	$old_categories[$category] = ''; // no color set yet
	$this->rc->user->save_prefs(array('calendar_categories' => $old_categories));
	}

	return $events;
	}

	/**
	* Get number of events in the given calendar
	*
	* @param mixed List of calendar IDs to count events (either as array or comma-separated string)
	* @param integer Date range start (unix timestamp)
	* @param integer Date range end (unix timestamp)
	* @return array Hash array with counts grouped by calendar ID
	*/
	public function count_events($calendars, $start, $end = null)
	{
	$counts = array();

	if ($calendars && is_string($calendars))
	$calendars = explode(',', $calendars);
	else if (!$calendars)
	$calendars = array_keys($this->calendars);

	foreach ($calendars as $cid) {
	if ($storage = $this->get_calendar($cid)) {
	$counts[$cid] = $storage->count_events($start, $end);
	}
	}

	return $counts;
	}

	/**
	* Get a list of pending alarms to be displayed to the user
	*
	* @see calendar_driver::pending_alarms()
	*/
	public function pending_alarms($time, $calendars = null)
	{
	$interval = 300;
	$time -= $time % 60;

	$slot = $time;
	$slot -= $slot % $interval;

	$last = $time - max(60, $this->rc->config->get('refresh_interval', 0));
	$last -= $last % $interval;

	// only check for alerts once in 5 minutes
	if ($last == $slot)
	return array();

	if ($calendars && is_string($calendars))
	$calendars = explode(',', $calendars);

	$time = $slot + $interval;

	$candidates = array();
	$query = array(array('tags', '=', 'x-has-alarms'));
	foreach ($this->calendars as $cid => $calendar) {
	// skip calendars with alarms disabled
	if (!$calendar->alarms \|\| ($calendars && !in_array($cid, $calendars)))
	continue;

	foreach ($calendar->list_events($time, $time + 86400 * 365, null, 1, $query) as $e) {
	// add to list if alarm is set
	$alarm = libcalendaring::get_next_alarm($e);
	if ($alarm && $alarm['time'] && $alarm['time'] >= $last && in_array($alarm['action'], $this->alarm_types)) {
	$id = $alarm['id']; // use alarm-id as primary identifier
	$candidates[$id] = array(
	'id' => $id,
	'title' => $e['title'],
	'location' => $e['location'],
	'start' => $e['start'],
	'end' => $e['end'],
	'notifyat' => $alarm['time'],
	'action' => $alarm['action'],
	);
	}
	}
	}

	// get alarm information stored in local database
	if (!empty($candidates)) {
	$alarm_ids = array_map(array($this->rc->db, 'quote'), array_keys($candidates));
	$result = $this->rc->db->query("SELECT *"
	. " FROM " . $this->rc->db->table_name('kolab_alarms', true)
	. " WHERE `alarm_id` IN (" . join(',', $alarm_ids) . ")"
	. " AND `user_id` = ?",
	$this->rc->user->ID
	);

	while ($result && ($e = $this->rc->db->fetch_assoc($result))) {
	$dbdata[$e['alarm_id']] = $e;
	}
	}

	$alarms = array();
	foreach ($candidates as $id => $alarm) {
	// skip dismissed alarms
	if ($dbdata[$id]['dismissed'])
	continue;

	// snooze function may have shifted alarm time
	$notifyat = $dbdata[$id]['notifyat'] ? strtotime($dbdata[$id]['notifyat']) : $alarm['notifyat'];
	if ($notifyat <= $time)
	$alarms[] = $alarm;
	}

	return $alarms;
	}

	/**
	* Feedback after showing/sending an alarm notification
	*
	* @see calendar_driver::dismiss_alarm()
	*/
	public function dismiss_alarm($alarm_id, $snooze = 0)
	{
	$alarms_table = $this->rc->db->table_name('kolab_alarms', true);
	// delete old alarm entry
	$this->rc->db->query("DELETE FROM $alarms_table"
	. " WHERE `alarm_id` = ? AND `user_id` = ?",
	$alarm_id,
	$this->rc->user->ID
	);

	// set new notifyat time or unset if not snoozed
	$notifyat = $snooze > 0 ? date('Y-m-d H:i:s', time() + $snooze) : null;

	$query = $this->rc->db->query("INSERT INTO $alarms_table"
	. " (`alarm_id`, `user_id`, `dismissed`, `notifyat`)"
	. " VALUES (?, ?, ?, ?)",
	$alarm_id,
	$this->rc->user->ID,
	$snooze > 0 ? 0 : 1,
	$notifyat
	);

	return $this->rc->db->affected_rows($query);
	}

	/**
	* List attachments from the given event
	*/
	public function list_attachments($event)
	{
	if (!($storage = $this->get_calendar($event['calendar'])))
	return false;

	$event = $storage->get_event($event['id']);

	return $event['attachments'];
	}

	/**
	* Get attachment properties
	*/
	public function get_attachment($id, $event)
	{
	if (!($storage = $this->get_calendar($event['calendar'])))
	return false;

	$event = $storage->get_event($event['id']);

	if ($event && !empty($event['attachments'])) {
	foreach ($event['attachments'] as $att) {
	if ($att['id'] == $id) {
	return $att;
	}
	}
	}

	return null;
	}

	/**
	* Get attachment body
	* @see calendar_driver::get_attachment_body()
	*/
	public function get_attachment_body($id, $event)
	{
	if (!($cal = $this->get_calendar($event['calendar'])))
	return false;

	return $cal->storage->get_attachment($event['id'], $id);
	}

	/**
	* Build a struct representing the given message reference
	*
	* @see calendar_driver::get_message_reference()
	*/
	public function get_message_reference($uri_or_headers, $folder = null)
	{
	if (is_object($uri_or_headers)) {
	$uri_or_headers = kolab_storage_config::get_message_uri($uri_or_headers, $folder);
	}

	if (is_string($uri_or_headers)) {
	return kolab_storage_config::get_message_reference($uri_or_headers, 'event');
	}

	return false;
	}

	/**
	* List availabale categories
	* The default implementation reads them from config/user prefs
	*/
	public function list_categories()
	{
	// FIXME: complete list with categories saved in config objects (KEP:12)
	return $this->rc->config->get('calendar_categories', $this->default_categories);
	}

	+ /**
	+ * Create instances of a recurring event
	+ *
	+ * @param array Hash array with event properties
	+ * @param object DateTime Start date of the recurrence window
	+ * @param object DateTime End date of the recurrence window
	+ * @return array List of recurring event instances
	+ */
	+ public function get_recurring_events($event, $start, $end = null)
	+ {
	+ // load the given event data into a libkolabxml container
	+ if (!$event['_formatobj']) {
	+ $event_xml = new kolab_format_event();
	+ $event_xml->set($event);
	+ $event['_formatobj'] = $event_xml;
	+ }
	+
	+ $this->_read_calendars();
	+ $storage = reset($this->calendars);
	+ return $storage->get_recurring_events($event, $start, $end);
	+ }
	+
	/**
	* Fetch free/busy information from a person within the given range
	*/
	public function get_freebusy_list($email, $start, $end)
	{
	if (empty($email)/* \|\| $end < time()*/)
	return false;

	// map vcalendar fbtypes to internal values
	$fbtypemap = array(
	'FREE' => calendar::FREEBUSY_FREE,
	'BUSY-TENTATIVE' => calendar::FREEBUSY_TENTATIVE,
	'X-OUT-OF-OFFICE' => calendar::FREEBUSY_OOF,
	'OOF' => calendar::FREEBUSY_OOF);

	// ask kolab server first
	try {
	$request_config = array(
	'store_body' => true,
	'follow_redirects' => true,
	);
	$request = libkolab::http_request(kolab_storage::get_freebusy_url($email), 'GET', $request_config);
	$response = $request->send();

	// authentication required
	if ($response->getStatus() == 401) {
	$request->setAuth($this->rc->user->get_username(), $this->rc->decrypt($_SESSION['password']));
	$response = $request->send();
	}

	if ($response->getStatus() == 200)
	$fbdata = $response->getBody();

	unset($request, $response);
	}
	catch (Exception $e) {
	PEAR::raiseError("Error fetching free/busy information: " . $e->getMessage());
	}

	// get free-busy url from contacts
	if (!$fbdata) {
	$fburl = null;
	foreach ((array)$this->rc->config->get('autocomplete_addressbooks', 'sql') as $book) {
	$abook = $this->rc->get_address_book($book);

	if ($result = $abook->search(array('email'), $email, true, true, true/, 'freebusyurl'/)) {
	while ($contact = $result->iterate()) {
	if ($fburl = $contact['freebusyurl']) {
	$fbdata = @file_get_contents($fburl);
	break;
	}
	}
	}

	if ($fbdata)
	break;
	}
	}

	// parse free-busy information using Horde classes
	if ($fbdata) {
	$ical = $this->cal->get_ical();
	$ical->import($fbdata);
	if ($fb = $ical->freebusy) {
	$result = array();
	foreach ($fb['periods'] as $tuple) {
	list($from, $to, $type) = $tuple;
	$result[] = array($from->format('U'), $to->format('U'), isset($fbtypemap[$type]) ? $fbtypemap[$type] : calendar::FREEBUSY_BUSY);
	}

	// we take 'dummy' free-busy lists as "unknown"
	if (empty($result) && !empty($fb['comment']) && stripos($fb['comment'], 'dummy'))
	return false;

	// set period from $start till the begin of the free-busy information as 'unknown'
	if ($fb['start'] && ($fbstart = $fb['start']->format('U')) && $start < $fbstart) {
	array_unshift($result, array($start, $fbstart, calendar::FREEBUSY_UNKNOWN));
	}
	// pad period till $end with status 'unknown'
	if ($fb['end'] && ($fbend = $fb['end']->format('U')) && $fbend < $end) {
	$result[] = array($fbend, $end, calendar::FREEBUSY_UNKNOWN);
	}

	return $result;
	}
	}

	return false;
	}

	/**
	* Handler to push folder triggers when sent from client.
	* Used to push free-busy changes asynchronously after updating an event
	*/
	public function push_freebusy()
	{
	// make shure triggering completes
	set_time_limit(0);
	ignore_user_abort(true);

	$cal = rcube_utils::get_input_value('source', rcube_utils::INPUT_GPC);
	if (!($cal = $this->get_calendar($cal)))
	return false;

	// trigger updates on folder
	$trigger = $cal->storage->trigger();
	if (is_object($trigger) && is_a($trigger, 'PEAR_Error')) {
	rcube::raise_error(array(
	'code' => 900, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Failed triggering folder. Error was " . $trigger->getMessage()),
	true, false);
	}

	exit;
	}


	/**
	* Convert from Kolab_Format to internal representation
	*/
	public static function to_rcube_event($record)
	{
	$record['id'] = $record['uid'];

	// all-day events go from 12:00 - 13:00
	if (is_a($record['start'], 'DateTime') && $record['end'] <= $record['start'] && $record['allday']) {
	$record['end'] = clone $record['start'];
	$record['end']->add(new DateInterval('PT1H'));
	}

	if (!empty($record['_attachments'])) {
	foreach ($record['_attachments'] as $key => $attachment) {
	if ($attachment !== false) {
	if (!$attachment['name'])
	$attachment['name'] = $key;

	unset($attachment['path'], $attachment['content']);
	$attachments[] = $attachment;
	}
	}

	$record['attachments'] = $attachments;
	}

	if (!empty($record['attendees'])) {
	foreach ((array)$record['attendees'] as $i => $attendee) {
	if (is_array($attendee['delegated-from'])) {
	$record['attendees'][$i]['delegated-from'] = join(', ', $attendee['delegated-from']);
	}
	if (is_array($attendee['delegated-to'])) {
	$record['attendees'][$i]['delegated-to'] = join(', ', $attendee['delegated-to']);
	}
	}
	}

	// Roundcube only supports one category assignment
	if (is_array($record['categories']))
	$record['categories'] = $record['categories'][0];

	// the cancelled flag transltes into status=CANCELLED
	if ($record['cancelled'])
	$record['status'] = 'CANCELLED';

	// The web client only supports DISPLAY type of alarms
	if (!empty($record['alarms']))
	$record['alarms'] = preg_replace('/:[A-Z]+$/', ':DISPLAY', $record['alarms']);

	// remove empty recurrence array
	if (empty($record['recurrence']))
	unset($record['recurrence']);

	// remove internals
	unset($record['_mailbox'], $record['_msguid'], $record['_formatobj'], $record['_attachments'], $record['x-custom']);

	return $record;
	}

	/**
	* Set CSS class according to the event's attendde partstat
	*/
	public static function add_partstat_class($event, $partstats, $user = null)
	{
	// set classes according to PARTSTAT
	if (is_array($event['attendees'])) {
	$user_emails = libcalendaring::get_instance()->get_user_emails($user);
	$partstat = 'UNKNOWN';
	foreach ($event['attendees'] as $attendee) {
	if (in_array($attendee['email'], $user_emails)) {
	$partstat = $attendee['status'];
	break;
	}
	}

	if (in_array($partstat, $partstats)) {
	$event['className'] = trim($event['className'] . ' fc-invitation-' . strtolower($partstat));
	}
	}

	return $event;
	}

	/**
	* Provide a list of revisions for the given event
	*
	* @param array $event Hash array with event properties
	*
	* @return array List of changes, each as a hash array
	* @see calendar_driver::get_event_changelog()
	*/
	public function get_event_changelog($event)
	{
	if (empty($this->bonnie_api)) {
	return false;
	}

	list($uid, $mailbox) = $this->_resolve_event_identity($event);

	$result = $this->bonnie_api->changelog('event', $uid, $mailbox);
	if (is_array($result) && $result['uid'] == $uid) {
	return $result['changes'];
	}

	return false;
	}

	/**
	* Get a list of property changes beteen two revisions of an event
	*
	* @param array $event Hash array with event properties
	* @param mixed $rev Revisions: "from:to"
	*
	* @return array List of property changes, each as a hash array
	* @see calendar_driver::get_event_diff()
	*/
	public function get_event_diff($event, $rev)
	{
	if (empty($this->bonnie_api)) {
	return false;
	}

	list($uid, $mailbox) = $this->_resolve_event_identity($event);

	// call Bonnie API
	$result = $this->bonnie_api->diff('event', $uid, $rev, $mailbox);
	if (is_array($result) && $result['uid'] == $uid) {
	$result['rev'] = $rev;

	$keymap = array(
	'dtstart' => 'start',
	'dtend' => 'end',
	'dstamp' => 'changed',
	'summary' => 'title',
	'alarm' => 'alarms',
	'attendee' => 'attendees',
	'attach' => 'attachments',
	'rrule' => 'recurrence',
	'transparency' => 'free_busy',
	'classification' => 'sensitivity',
	'lastmodified-date' => 'changed',
	);
	$prop_keymaps = array(
	'attachments' => array('fmttype' => 'mimetype', 'label' => 'name'),
	'attendees' => array('partstat' => 'status'),
	);
	$special_changes = array();

	// map kolab event properties to keys the client expects
	array_walk($result['changes'], function(&$change, $i) use ($keymap, $prop_keymaps, $special_changes) {
	if (array_key_exists($change['property'], $keymap)) {
	$change['property'] = $keymap[$change['property']];
	}
	// translate free_busy values
	if ($change['property'] == 'free_busy') {
	$change['old'] = $old['old'] ? 'free' : 'busy';
	$change['new'] = $old['new'] ? 'free' : 'busy';
	}
	// map alarms trigger value
	if ($change['property'] == 'alarms') {
	if (is_array($change['old']) && is_array($change['old']['trigger']))
	$change['old']['trigger'] = $change['old']['trigger']['value'];
	if (is_array($change['new']) && is_array($change['new']['trigger']))
	$change['new']['trigger'] = $change['new']['trigger']['value'];
	}
	// make all property keys uppercase
	if ($change['property'] == 'recurrence') {
	$special_changes['recurrence'] = $i;
	foreach (array('old','new') as $m) {
	if (is_array($change[$m])) {
	$props = array();
	foreach ($change[$m] as $k => $v)
	$props[strtoupper($k)] = $v;
	$change[$m] = $props;
	}
	}
	}
	// map property keys names
	if (is_array($prop_keymaps[$change['property']])) {
	foreach ($prop_keymaps[$change['property']] as $k => $dest) {
	if (is_array($change['old']) && array_key_exists($k, $change['old'])) {
	$change['old'][$dest] = $change['old'][$k];
	unset($change['old'][$k]);
	}
	if (is_array($change['new']) && array_key_exists($k, $change['new'])) {
	$change['new'][$dest] = $change['new'][$k];
	unset($change['new'][$k]);
	}
	}
	}

	if ($change['property'] == 'exdate') {
	$special_changes['exdate'] = $i;
	}
	else if ($change['property'] == 'rdate') {
	$special_changes['rdate'] = $i;
	}
	});

	// merge some recurrence changes
	foreach (array('exdate','rdate') as $prop) {
	if (array_key_exists($prop, $special_changes)) {
	$exdate = $result['changes'][$special_changes[$prop]];
	if (array_key_exists('recurrence', $special_changes)) {
	$recurrence = &$result['changes'][$special_changes['recurrence']];
	}
	else {
	$i = count($result['changes']);
	$result['changes'][$i] = array('property' => 'recurrence', 'old' => array(), 'new' => array());
	$recurrence = &$result['changes'][$i]['recurrence'];
	}
	$key = strtoupper($prop);
	$recurrence['old'][$key] = $exdate['old'];
	$recurrence['new'][$key] = $exdate['new'];
	unset($result['changes'][$special_changes[$prop]]);
	}
	}

	return $result;
	}

	return false;
	}

	/**
	* Return full data of a specific revision of an event
	*
	* @param array Hash array with event properties
	* @param mixed $rev Revision number
	*
	* @return array Event object as hash array
	* @see calendar_driver::get_event_revison()
	*/
	public function get_event_revison($event, $rev)
	{
	if (empty($this->bonnie_api)) {
	return false;
	}

	$calid = $event['calendar'];
	list($uid, $mailbox) = $this->_resolve_event_identity($event);

	// call Bonnie API
	$result = $this->bonnie_api->get('event', $uid, $rev, $mailbox);
	if (is_array($result) && $result['uid'] == $uid && !empty($result['xml'])) {
	$format = kolab_format::factory('event');
	$format->load($result['xml']);
	$event = $format->to_array();

	if ($format->is_valid()) {
	$event['calendar'] = $calid;
	$event['rev'] = $result['rev'];
	return self::to_rcube_event($event);
	}
	}

	return false;
	}

	/**
	* Helper method to resolved the given event identifier into uid and folder
	*
	* @return array (uid,folder) tuple
	*/
	private function _resolve_event_identity($event)
	{
	$mailbox = null;
	if (is_array($event)) {
	$uid = $event['id'] ?: $event['uid'];
	if (($cal = $this->get_calendar($event['calendar'])) && !($cal instanceof kolab_invitation_calendar)) {
	$mailbox = $cal->get_mailbox_id();
	}
	}
	else {
	$uid = $event;
	}

	return array($uid, $mailbox);
	}

	/**
	* Callback function to produce driver-specific calendar create/edit form
	*
	* @param string Request action 'form-edit\|form-new'
	* @param array Calendar properties (e.g. id, color)
	* @param array Edit form fields
	*
	* @return string HTML content of the form
	*/
	public function calendar_form($action, $calendar, $formfields)
	{
	// show default dialog for birthday calendar
	if (in_array($calendar['id'], array(self::BIRTHDAY_CALENDAR_ID, self::INVITATIONS_CALENDAR_PENDING, self::INVITATIONS_CALENDAR_DECLINED))) {
	if ($calendar['id'] != self::BIRTHDAY_CALENDAR_ID)
	unset($formfields['showalarms']);
	return parent::calendar_form($action, $calendar, $formfields);
	}

	if ($calendar['id'] && ($cal = $this->calendars[$calendar['id']])) {
	$folder = $cal->get_realname(); // UTF7
	$color = $cal->get_color();
	}
	else {
	$folder = '';
	$color = '';
	}

	$hidden_fields[] = array('name' => 'oldname', 'value' => $folder);

	$storage = $this->rc->get_storage();
	$delim = $storage->get_hierarchy_delimiter();
	$form = array();

	if (strlen($folder)) {
	$path_imap = explode($delim, $folder);
	array_pop($path_imap); // pop off name part
	$path_imap = implode($path_imap, $delim);

	$options = $storage->folder_info($folder);
	}
	else {
	$path_imap = '';
	}

	// General tab
	$form['props'] = array(
	'name' => $this->rc->gettext('properties'),
	);

	// Disable folder name input
	if (!empty($options) && ($options['norename'] \|\| $options['protected'])) {
	$input_name = new html_hiddenfield(array('name' => 'name', 'id' => 'calendar-name'));
	$formfields['name']['value'] = kolab_storage::object_name($folder)
	. $input_name->show($folder);
	}

	// calendar name (default field)
	$form['props']['fieldsets']['location'] = array(
	'name' => $this->rc->gettext('location'),
	'content' => array(
	'name' => $formfields['name']
	),
	);

	if (!empty($options) && ($options['norename'] \|\| $options['protected'])) {
	// prevent user from moving folder
	$hidden_fields[] = array('name' => 'parent', 'value' => $path_imap);
	}
	else {
	$select = kolab_storage::folder_selector('event', array('name' => 'parent', 'id' => 'calendar-parent'), $folder);
	$form['props']['fieldsets']['location']['content']['path'] = array(
	'id' => 'calendar-parent',
	'label' => $this->cal->gettext('parentcalendar'),
	'value' => $select->show(strlen($folder) ? $path_imap : ''),
	);
	}

	// calendar color (default field)
	$form['props']['fieldsets']['settings'] = array(
	'name' => $this->rc->gettext('settings'),
	'content' => array(
	'color' => $formfields['color'],
	'showalarms' => $formfields['showalarms'],
	),
	);


	if ($action != 'form-new') {
	$form['sharing'] = array(
	'name' => Q($this->cal->gettext('tabsharing')),
	'content' => html::tag('iframe', array(
	'src' => $this->cal->rc->url(array('_action' => 'calendar-acl', 'id' => $calendar['id'], 'framed' => 1)),
	'width' => '100%',
	'height' => 350,
	'border' => 0,
	'style' => 'border:0'),
	''),
	);
	}

	$this->form_html = '';
	if (is_array($hidden_fields)) {
	foreach ($hidden_fields as $field) {
	$hiddenfield = new html_hiddenfield($field);
	$this->form_html .= $hiddenfield->show() . "\n";
	}
	}

	// Create form output
	foreach ($form as $tab) {
	if (!empty($tab['fieldsets']) && is_array($tab['fieldsets'])) {
	$content = '';
	foreach ($tab['fieldsets'] as $fieldset) {
	$subcontent = $this->get_form_part($fieldset);
	if ($subcontent) {
	$content .= html::tag('fieldset', null, html::tag('legend', null, Q($fieldset['name'])) . $subcontent) ."\n";
	}
	}
	}
	else {
	$content = $this->get_form_part($tab);
	}

	if ($content) {
	$this->form_html .= html::tag('fieldset', null, html::tag('legend', null, Q($tab['name'])) . $content) ."\n";
	}
	}

	// Parse form template for skin-dependent stuff
	$this->rc->output->add_handler('calendarform', array($this, 'calendar_form_html'));
	return $this->rc->output->parse('calendar.kolabform', false, false);
	}

	/**
	* Handler for template object
	*/
	public function calendar_form_html()
	{
	return $this->form_html;
	}

	/**
	* Helper function used in calendar_form_content(). Creates a part of the form.
	*/
	private function get_form_part($form)
	{
	$content = '';

	if (is_array($form['content']) && !empty($form['content'])) {
	$table = new html_table(array('cols' => 2));
	foreach ($form['content'] as $col => $colprop) {
	$label = !empty($colprop['label']) ? $colprop['label'] : rcube_label($col);

	$table->add('title', html::label($colprop['id'], Q($label)));
	$table->add(null, $colprop['value']);
	}
	$content = $table->show();
	}
	else {
	$content = $form['content'];
	}

	return $content;
	}


	/**
	* Handler to render ACL form for a calendar folder
	*/
	public function calendar_acl()
	{
	$this->rc->output->add_handler('folderacl', array($this, 'calendar_acl_form'));
	$this->rc->output->send('calendar.kolabacl');
	}

	/**
	* Handler for ACL form template object
	*/
	public function calendar_acl_form()
	{
	$calid = rcube_utils::get_input_value('_id', rcube_utils::INPUT_GPC);
	if ($calid && ($cal = $this->get_calendar($calid))) {
	$folder = $cal->get_realname(); // UTF7
	$color = $cal->get_color();
	}
	else {
	$folder = '';
	$color = '';
	}

	$storage = $this->rc->get_storage();
	$delim = $storage->get_hierarchy_delimiter();
	$form = array();

	if (strlen($folder)) {
	$path_imap = explode($delim, $folder);
	array_pop($path_imap); // pop off name part
	$path_imap = implode($path_imap, $delim);

	$options = $storage->folder_info($folder);

	// Allow plugins to modify the form content (e.g. with ACL form)
	$plugin = $this->rc->plugins->exec_hook('calendar_form_kolab',
	array('form' => $form, 'options' => $options, 'name' => $folder));
	}

	if (!$plugin['form']['sharing']['content'])
	$plugin['form']['sharing']['content'] = html::div('hint', $this->cal->gettext('aclnorights'));

	return $plugin['form']['sharing']['content'];
	}

	/**
	* Handler for user_delete plugin hook
	*/
	public function user_delete($args)
	{
	$db = $this->rc->get_dbh();
	foreach (array('kolab_alarms', 'itipinvitations') as $table) {
	$db->query("DELETE FROM " . $this->rc->db->table_name($table, true)
	. " WHERE `user_id` = ?", $args['user']->ID);
	}
	}
	}
	diff --git a/plugins/libcalendaring/lib/libcalendaring_itip.php b/plugins/libcalendaring/lib/libcalendaring_itip.php
	index 06853379..3eead6fa 100644
	--- a/plugins/libcalendaring/lib/libcalendaring_itip.php
	+++ b/plugins/libcalendaring/lib/libcalendaring_itip.php
	@@ -1,770 +1,775 @@
	<?php

	/**
	* iTIP functions for the calendar-based Roudncube plugins
	*
	* Class providing functionality to manage iTIP invitations
	*
	* @author Thomas Bruederli <bruederli@kolabsys.com>
	*
	* Copyright (C) 2011-2014, Kolab Systems AG <contact@kolabsys.com>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU Affero General Public License for more details.
	*
	* 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/>.
	*/
	class libcalendaring_itip
	{
	protected $rc;
	protected $lib;
	protected $plugin;
	protected $sender;
	protected $domain;
	protected $itip_send = false;
	protected $rsvp_actions = array('accepted','tentative','declined','delegated');
	protected $rsvp_status = array('accepted','tentative','declined','delegated');

	function __construct($plugin, $domain = 'libcalendaring')
	{
	$this->plugin = $plugin;
	$this->rc = rcube::get_instance();
	$this->lib = libcalendaring::get_instance();
	$this->domain = $domain;

	$hook = $this->rc->plugins->exec_hook('calendar_load_itip',
	array('identity' => $this->rc->user->list_emails(true)));
	$this->sender = $hook['identity'];

	$this->plugin->add_hook('message_before_send', array($this, 'before_send_hook'));
	$this->plugin->add_hook('smtp_connect', array($this, 'smtp_connect_hook'));
	}

	public function set_sender_email($email)
	{
	if (!empty($email))
	$this->sender['email'] = $email;
	}

	public function set_rsvp_actions($actions)
	{
	$this->rsvp_actions = (array)$actions;
	$this->rsvp_status = array_merge($this->rsvp_actions, array('delegated'));
	}

	public function set_rsvp_status($status)
	{
	$this->rsvp_status = $status;
	}

	/**
	* Wrapper for rcube_plugin::gettext()
	* Checking for a label in different domains
	*
	* @see rcube::gettext()
	*/
	public function gettext($p)
	{
	$label = is_array($p) ? $p['name'] : $p;
	$domain = $this->domain;
	if (!$this->rc->text_exists($label, $domain)) {
	$domain = 'libcalendaring';
	}
	return $this->rc->gettext($p, $domain);
	}

	/**
	* Send an iTip mail message
	*
	* @param array Event object to send
	* @param string iTip method (REQUEST\|REPLY\|CANCEL)
	* @param array Hash array with recipient data (name, email)
	* @param string Mail subject
	* @param string Mail body text label
	* @param object Mail_mime object with message data
	* @param boolean Request RSVP
	* @return boolean True on success, false on failure
	*/
	public function send_itip_message($event, $method, $recipient, $subject, $bodytext, $message = null, $rsvp = true)
	{
	if (!$this->sender['name'])
	$this->sender['name'] = $this->sender['email'];

	if (!$message)
	$message = $this->compose_itip_message($event, $method, $rsvp);

	$mailto = rcube_idn_to_ascii($recipient['email']);

	$headers = $message->headers();
	$headers['To'] = format_email_recipient($mailto, $recipient['name']);
	$headers['Subject'] = $this->gettext(array(
	'name' => $subject,
	'vars' => array(
	'title' => $event['title'],
	'name' => $this->sender['name']
	)
	));

	// compose a list of all event attendees
	$attendees_list = array();
	foreach ((array)$event['attendees'] as $attendee) {
	$attendees_list[] = ($attendee['name'] && $attendee['email']) ?
	$attendee['name'] . ' <' . $attendee['email'] . '>' :
	($attendee['name'] ? $attendee['name'] : $attendee['email']);
	}

	$mailbody = $this->gettext(array(
	'name' => $bodytext,
	'vars' => array(
	'title' => $event['title'],
	- 'date' => $this->lib->event_date_text($event, true),
	+ 'date' => $this->lib->event_date_text($event, true) .
	+ (empty($event['recurrence']) ? '' : sprintf("\n%s: %s", $this->gettext('recurring'), $this->lib->recurrence_text($event['recurrence']))),
	'attendees' => join(",\n ", $attendees_list),
	'sender' => $this->sender['name'],
	'organizer' => $this->sender['name'],
	)
	));

	// if (!empty($event['comment'])) {
	// $mailbody .= "\n\n" . $this->gettext('itipsendercomment') . $event['comment'];
	// }

	// append links for direct invitation replies
	if ($method == 'REQUEST' && $rsvp && ($token = $this->store_invitation($event, $recipient['email']))) {
	$mailbody .= "\n\n" . $this->gettext(array(
	'name' => 'invitationattendlinks',
	'vars' => array('url' => $this->plugin->get_url(array('action' => 'attend', 't' => $token))),
	));
	}
	else if ($method == 'CANCEL' && $event['cancelled']) {
	$this->cancel_itip_invitation($event);
	}

	$message->headers($headers, true);
	$message->setTXTBody(rcube_mime::format_flowed($mailbody, 79));

	// finally send the message
	$this->itip_send = true;
	$sent = $this->rc->deliver_message($message, $headers['X-Sender'], $mailto, $smtp_error);
	$this->itip_send = false;

	return $sent;
	}

	/**
	* Plugin hook triggered by rcube::deliver_message() before delivering a message.
	* Here we can set the 'smtp_server' config option to '' in order to use
	* PHP's mail() function for unauthenticated email sending.
	*/
	public function before_send_hook($p)
	{
	if ($this->itip_send && !$this->rc->user->ID && $this->rc->config->get('calendar_itip_smtp_server', null) === '') {
	$this->rc->config->set('smtp_server', '');
	}

	return $p;
	}

	/**
	* Plugin hook to alter SMTP authentication.
	* This is used if iTip messages are to be sent from an unauthenticated session
	*/
	public function smtp_connect_hook($p)
	{
	// replace smtp auth settings if we're not in an authenticated session
	if ($this->itip_send && !$this->rc->user->ID) {
	foreach (array('smtp_server', 'smtp_user', 'smtp_pass') as $prop) {
	$p[$prop] = $this->rc->config->get("calendar_itip_$prop", $p[$prop]);
	}
	}

	return $p;
	}

	/**
	* Helper function to build a Mail_mime object to send an iTip message
	*
	* @param array Event object to send
	* @param string iTip method (REQUEST\|REPLY\|CANCEL)
	* @param boolean Request RSVP
	* @return object Mail_mime object with message data
	*/
	public function compose_itip_message($event, $method, $rsvp = true)
	{
	$from = rcube_idn_to_ascii($this->sender['email']);
	$from_utf = rcube_utils::idn_to_utf8($from);
	$sender = format_email_recipient($from, $this->sender['name']);

	// truncate list attendees down to the recipient of the iTip Reply.
	// constraints for a METHOD:REPLY according to RFC 5546
	if ($method == 'REPLY') {
	$replying_attendee = null;
	$reply_attendees = array();
	foreach ($event['attendees'] as $attendee) {
	if ($attendee['role'] == 'ORGANIZER') {
	$reply_attendees[] = $attendee;
	}
	else if (strcasecmp($attendee['email'], $from) == 0 \|\| strcasecmp($attendee['email'], $from_utf) == 0) {
	$replying_attendee = $attendee;
	if ($attendee['status'] != 'DELEGATED') {
	unset($replying_attendee['rsvp']); // unset the RSVP attribute
	}
	}
	// include attendees relevant for delegation (RFC 5546, Section 4.2.5)
	else if ((!empty($attendee['delegated-to']) &&
	(strcasecmp($attendee['delegated-to'], $from) == 0 \|\| strcasecmp($attendee['delegated-to'], $from_utf) == 0)) \|\|
	(!empty($attendee['delegated-from']) &&
	(strcasecmp($attendee['delegated-from'], $from) == 0 \|\| strcasecmp($attendee['delegated-from'], $from_utf) == 0))) {
	$reply_attendees[] = $attendee;
	}
	}
	if ($replying_attendee) {
	array_unshift($reply_attendees, $replying_attendee);
	$event['attendees'] = $reply_attendees;
	}
	}
	// set RSVP for every attendee
	else if ($method == 'REQUEST') {
	foreach ($event['attendees'] as $i => $attendee) {
	if ($attendee['status'] != 'DELEGATED') {
	$event['attendees'][$i]['rsvp']= $rsvp ? true : null;
	}
	}
	}

	// compose multipart message using PEAR:Mail_Mime
	$message = new Mail_mime("\r\n");
	$message->setParam('text_encoding', 'quoted-printable');
	$message->setParam('head_encoding', 'quoted-printable');
	$message->setParam('head_charset', RCMAIL_CHARSET);
	$message->setParam('text_charset', RCMAIL_CHARSET . ";\r\n format=flowed");
	$message->setContentType('multipart/alternative');

	// compose common headers array
	$headers = array(
	'From' => $sender,
	'Date' => $this->rc->user_date(),
	'Message-ID' => $this->rc->gen_message_id(),
	'X-Sender' => $from,
	);
	if ($agent = $this->rc->config->get('useragent')) {
	$headers['User-Agent'] = $agent;
	}

	$message->headers($headers);

	// attach ics file for this event
	$ical = libcalendaring::get_ical();
	$ics = $ical->export(array($event), $method, false, $method == 'REQUEST' && $this->plugin->driver ? array($this->plugin->driver, 'get_attachment_body') : false);
	$filename = $event['_type'] == 'task' ? 'todo.ics' : 'event.ics';
	$message->addAttachment($ics, 'text/calendar', $filename, false, '8bit', '', RCMAIL_CHARSET . "; method=" . $method);

	return $message;
	}

	/**
	* Forward the given iTip event as delegation to another person
	*
	* @param array Event object to delegate
	* @param mixed Delegatee as string or hash array with keys 'name' and 'mailto'
	* @param boolean The delegator's RSVP flag
	* @return boolean True on success, False on failure
	*/
	public function delegate_to(&$event, $delegate, $rsvp = false)
	{
	if (is_string($delegate)) {
	$delegates = rcube_mime::decode_address_list($delegate, 1, false);
	if (count($delegates) > 0) {
	$delegate = reset($delegates);
	}
	}

	$emails = $this->lib->get_user_emails();
	$me = $this->rc->user->list_emails(true);

	// find/create the delegate attendee
	$delegate_attendee = array(
	'email' => $delegate['mailto'],
	'name' => $delegate['name'],
	'role' => 'REQ-PARTICIPANT',
	);
	$delegate_index = count($event['attendees']);

	foreach ($event['attendees'] as $i => $attendee) {
	// set myself the DELEGATED-TO parameter
	if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	$event['attendees'][$i]['delegated-to'] = $delegate['mailto'];
	$event['attendees'][$i]['status'] = 'DELEGATED';
	$event['attendees'][$i]['role'] = 'NON-PARTICIPANT';
	$event['attendees'][$i]['rsvp'] = $rsvp;

	$me['email'] = $attendee['email'];
	$delegate_attendee['role'] = $attendee['role'];
	}
	// the disired delegatee is already listed as an attendee
	else if (stripos($delegate['mailto'], $attendee['email']) !== false && $attendee['role'] != 'ORGANIZER') {
	$delegate_attendee = $attendee;
	$delegate_index = $i;
	break;
	}
	// TODO: remove previous delegatee (i.e. attendee that has DELEGATED-FROM == $me)
	}

	// set/add delegate attendee with RSVP=TRUE and DELEGATED-FROM parameter
	$delegate_attendee['rsvp'] = true;
	$delegate_attendee['status'] = 'NEEDS-ACTION';
	$delegate_attendee['delegated-from'] = $me['email'];
	$event['attendees'][$delegate_index] = $delegate_attendee;

	$this->set_sender_email($me['email']);
	return $this->send_itip_message($event, 'REQUEST', $delegate_attendee, 'itipsubjectdelegatedto', 'itipmailbodydelegatedto');
	}

	/**
	* Handler for calendar/itip-status requests
	*/
	public function get_itip_status($event, $existing = null)
	{
	$action = $event['rsvp'] ? 'rsvp' : '';
	$status = $event['fallback'];
	$latest = false;
	$html = '';

	if (is_numeric($event['changed']))
	$event['changed'] = new DateTime('@'.$event['changed']);

	// check if the given itip object matches the last state
	if ($existing) {
	$latest = (isset($event['sequence']) && $existing['sequence'] == $event['sequence']) \|\|
	(!isset($event['sequence']) && $existing['changed'] && $existing['changed'] >= $event['changed']);
	}

	// determine action for REQUEST
	if ($event['method'] == 'REQUEST') {
	$html = html::div('rsvp-status', $this->gettext('acceptinvitation'));

	if ($existing) {
	$rsvp = $event['rsvp'];
	$emails = $this->lib->get_user_emails();
	foreach ($existing['attendees'] as $attendee) {
	if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	$status = strtoupper($attendee['status']);
	break;
	}
	}
	}
	else {
	$rsvp = $event['rsvp'] && $this->rc->config->get('calendar_allow_itip_uninvited', true);
	}

	$status_lc = strtolower($status);

	if ($status_lc == 'unknown' && !$this->rc->config->get('calendar_allow_itip_uninvited', true)) {
	$html = html::div('rsvp-status', $this->gettext('notanattendee'));
	$action = 'import';
	}
	else if (in_array($status_lc, $this->rsvp_status)) {
	$status_text = $this->gettext(($latest ? 'youhave' : 'youhavepreviously') . $status_lc);

	if ($existing && ($existing['sequence'] > $event['sequence'] \|\| (!isset($event['sequence']) && $existing['changed'] && $existing['changed'] > $event['changed']))) {
	$action = ''; // nothing to do here, outdated invitation
	if ($status_lc == 'needs-action')
	$status_text = $this->gettext('outdatedinvitation');
	}
	else if (!$existing && !$rsvp) {
	$action = 'import';
	}
	else if ($latest && $status_lc != 'needs-action') {
	$action = 'update';
	}

	$html = html::div('rsvp-status ' . $status_lc, $status_text);
	}
	}
	// determine action for REPLY
	else if ($event['method'] == 'REPLY') {
	// check whether the sender already is an attendee
	if ($existing) {
	$action = $this->rc->config->get('calendar_allow_itip_uninvited', true) ? 'accept' : '';
	$listed = false;
	foreach ($existing['attendees'] as $attendee) {
	if ($attendee['role'] != 'ORGANIZER' && strcasecmp($attendee['email'], $event['attendee']) == 0) {
	$status_lc = strtolower($status);
	if (in_array($status_lc, $this->rsvp_status)) {
	$html = html::div('rsvp-status ' . $status_lc, $this->gettext(array(
	'name' => 'attendee' . $status_lc,
	'vars' => array(
	'delegatedto' => Q($event['delegated-to'] ?: ($attendee['delegated-to'] ?: '?')),
	)
	)));
	}
	$action = $attendee['status'] == $status \|\| !$latest ? '' : 'update';
	$listed = true;
	break;
	}
	}

	if (!$listed) {
	$html = html::div('rsvp-status', $this->gettext('itipnewattendee'));
	}
	}
	else {
	$html = html::div('rsvp-status hint', $this->gettext('itipobjectnotfound'));
	$action = '';
	}
	}
	else if ($event['method'] == 'CANCEL') {
	if (!$existing) {
	$html = html::div('rsvp-status hint', $this->gettext('itipobjectnotfound'));
	$action = '';
	}
	}

	return array(
	'uid' => $event['uid'],
	'id' => asciiwords($event['uid'], true),
	'existing' => $existing ? true : false,
	'saved' => $existing ? true : false,
	'latest' => $latest,
	'status' => $status,
	'action' => $action,
	'html' => $html,
	);
	}

	/**
	* Build inline UI elements for iTip messages
	*/
	public function mail_itip_inline_ui($event, $method, $mime_id, $task, $message_date = null, $preview_url = null)
	{
	$buttons = array();
	$dom_id = asciiwords($event['uid'], true);
	$rsvp_status = 'unknown';

	// pass some metadata about the event and trigger the asynchronous status check
	$changed = is_object($event['changed']) ? $event['changed'] : $message_date;
	$metadata = array(
	'uid' => $event['uid'],
	'changed' => $changed ? $changed->format('U') : 0,
	'sequence' => intval($event['sequence']),
	'method' => $method,
	'task' => $task,
	);

	// create buttons to be activated from async request checking existence of this event in local calendars
	$buttons[] = html::div(array('id' => 'loading-'.$dom_id, 'class' => 'rsvp-status loading'), $this->gettext('loading'));

	// on iTip REPLY we have two options:
	if ($method == 'REPLY') {
	$title = $this->gettext('itipreply');

	foreach ($event['attendees'] as $attendee) {
	if (!empty($attendee['email']) && $attendee['role'] != 'ORGANIZER' &&
	(empty($event['_sender']) \|\| ($attendee['email'] == $event['_sender'] \|\| $attendee['email'] == $event['_sender_utf']))) {
	$metadata['attendee'] = $attendee['email'];
	$rsvp_status = strtoupper($attendee['status']);
	if ($attendee['delegated-to'])
	$metadata['delegated-to'] = $attendee['delegated-to'];
	break;
	}
	}

	// 1. update the attendee status on our copy
	$update_button = html::tag('input', array(
	'type' => 'button',
	'class' => 'button',
	'onclick' => "rcube_libcalendaring.add_from_itip_mail('" . JQ($mime_id) . "', '$task')",
	'value' => $this->gettext('updateattendeestatus'),
	));

	// 2. accept or decline a new or delegate attendee
	$accept_buttons = html::tag('input', array(
	'type' => 'button',
	'class' => "button accept",
	'onclick' => "rcube_libcalendaring.add_from_itip_mail('" . JQ($mime_id) . "', '$task')",
	'value' => $this->gettext('acceptattendee'),
	));
	$accept_buttons .= html::tag('input', array(
	'type' => 'button',
	'class' => "button decline",
	'onclick' => "rcube_libcalendaring.decline_attendee_reply('" . JQ($mime_id) . "', '$task')",
	'value' => $this->gettext('declineattendee'),
	));

	$buttons[] = html::div(array('id' => 'update-'.$dom_id, 'style' => 'display:none'), $update_button);
	$buttons[] = html::div(array('id' => 'accept-'.$dom_id, 'style' => 'display:none'), $accept_buttons);
	}
	// when receiving iTip REQUEST messages:
	else if ($method == 'REQUEST') {
	$emails = $this->lib->get_user_emails();
	$title = $event['sequence'] > 0 ? $this->gettext('itipupdate') : $this->gettext('itipinvitation');
	$metadata['rsvp'] = true;
	$metadata['sensitivity'] = $event['sensitivity'];

	if (is_object($event['start'])) {
	$metadata['date'] = $event['start']->format('U');
	}

	// check for X-KOLAB-INVITATIONTYPE property and only show accept/decline buttons
	if (self::get_custom_property($event, 'X-KOLAB-INVITATIONTYPE') == 'CONFIRMATION') {
	$this->rsvp_actions = array('accepted','declined');
	$metadata['nosave'] = true;
	}

	// 1. display RSVP buttons (if the user was invited)
	foreach ($this->rsvp_actions as $method) {
	$rsvp_buttons .= html::tag('input', array(
	'type' => 'button',
	'class' => "button $method",
	'onclick' => "rcube_libcalendaring.add_from_itip_mail('" . JQ($mime_id) . "', '$task', '$method', '$dom_id')",
	'value' => $this->gettext('itip' . $method),
	));
	}

	// add button to open calendar/preview
	if (!empty($preview_url)) {
	$msgref = $this->lib->ical_message->folder . '/' . $this->lib->ical_message->uid . '#' . $mime_id;
	$rsvp_buttons .= html::tag('input', array(
	'type' => 'button',
	'class' => "button preview",
	'onclick' => "rcube_libcalendaring.open_itip_preview('" . JQ($preview_url) . "', '" . JQ($msgref) . "')",
	'value' => $this->gettext('openpreview'),
	));
	}

	// 2. update the local copy with minor changes
	$update_button = html::tag('input', array(
	'type' => 'button',
	'class' => 'button',
	'onclick' => "rcube_libcalendaring.add_from_itip_mail('" . JQ($mime_id) . "', '$task')",
	'value' => $this->gettext('updatemycopy'),
	));

	// 3. Simply import the event without replying
	$import_button = html::tag('input', array(
	'type' => 'button',
	'class' => 'button',
	'onclick' => "rcube_libcalendaring.add_from_itip_mail('" . JQ($mime_id) . "', '$task')",
	'value' => $this->gettext('importtocalendar'),
	));

	// check my status
	foreach ($event['attendees'] as $attendee) {
	if ($attendee['email'] && in_array(strtolower($attendee['email']), $emails)) {
	$metadata['attendee'] = $attendee['email'];
	$metadata['rsvp'] = $attendee['rsvp'] \|\| $attendee['role'] != 'NON-PARTICIPANT';
	$rsvp_status = !empty($attendee['status']) ? strtoupper($attendee['status']) : 'NEEDS-ACTION';
	break;
	}
	}

	// add itip reply message controls
	$rsvp_buttons .= html::div('itip-reply-controls', $this->itip_rsvp_options_ui($dom_id, $metadata['nosave']));

	$buttons[] = html::div(array('id' => 'rsvp-'.$dom_id, 'class' => 'rsvp-buttons', 'style' => 'display:none'), $rsvp_buttons);
	$buttons[] = html::div(array('id' => 'update-'.$dom_id, 'style' => 'display:none'), $update_button);

	// prepare autocompletion for delegation dialog
	if (in_array('delegated', $this->rsvp_actions)) {
	$this->rc->autocomplete_init();
	}
	}
	// for CANCEL messages, we can:
	else if ($method == 'CANCEL') {
	$title = $this->gettext('itipcancellation');

	// 1. remove the event from our calendar
	$button_remove = html::tag('input', array(
	'type' => 'button',
	'class' => 'button',
	'onclick' => "rcube_libcalendaring.remove_from_itip('" . JQ($event['uid']) . "', '$task', '" . JQ($event['title']) . "')",
	'value' => $this->gettext('removefromcalendar'),
	));

	// 2. update our copy with status=cancelled
	$button_update = html::tag('input', array(
	'type' => 'button',
	'class' => 'button',
	'onclick' => "rcube_libcalendaring.add_from_itip_mail('" . JQ($mime_id) . "', '$task')",
	'value' => $this->gettext('updatemycopy'),
	));

	$buttons[] = html::div(array('id' => 'rsvp-'.$dom_id, 'style' => 'display:none'), $button_remove . $button_update);

	$rsvp_status = 'CANCELLED';
	$metadata['rsvp'] = true;
	}

	// append generic import button
	if ($import_button) {
	$buttons[] = html::div(array('id' => 'import-'.$dom_id, 'style' => 'display:none'), $import_button);
	}

	// pass some metadata about the event and trigger the asynchronous status check
	$metadata['fallback'] = $rsvp_status;
	$metadata['rsvp'] = intval($metadata['rsvp']);

	$this->rc->output->add_script("rcube_libcalendaring.fetch_itip_object_status(" . json_serialize($metadata) . ")", 'docready');

	// get localized texts from the right domain
	foreach (array('savingdata','deleteobjectconfirm','declinedeleteconfirm','declineattendee',
	'cancel','itipdelegated','declineattendeeconfirm','itipcomment','delegateinvitation',
	'delegateto','delegatersvpme','delegateinvalidaddress') as $label) {
	$this->rc->output->command('add_label', "itip.$label", $this->gettext($label));
	}

	// show event details with buttons
	return $this->itip_object_details_table($event, $title) .
	html::div(array('class' => 'itip-buttons', 'id' => 'itip-buttons-' . asciiwords($metadata['uid'], true)), join('', $buttons));
	}

	/**
	* Render an RSVP UI widget with buttons to respond on iTip invitations
	*/
	function itip_rsvp_buttons($attrib = array(), $actions = null)
	{
	$attrib += array('type' => 'button');

	if (!$actions)
	$actions = $this->rsvp_actions;

	foreach ($actions as $method) {
	$buttons .= html::tag('input', array(
	'type' => $attrib['type'],
	'name' => $attrib['iname'],
	'class' => 'button',
	'rel' => $method,
	'value' => $this->gettext('itip' . $method),
	));
	}

	$buttons .= html::div('itip-reply-controls', $this->itip_rsvp_options_ui($attrib['id']));

	// add localized texts for the delegation dialog
	if (in_array('delegated', $actions)) {
	foreach (array('itipdelegated','itipcomment','delegateinvitation',
	'delegateto','delegatersvpme','delegateinvalidaddress','cancel') as $label) {
	$this->rc->output->command('add_label', "itip.$label", $this->gettext($label));
	}
	}

	return html::div($attrib,
	html::div('label', $this->gettext('acceptinvitation')) .
	html::div('rsvp-buttons', $buttons));
	}

	/**
	* Render UI elements to control iTip reply message sending
	*/
	public function itip_rsvp_options_ui($dom_id, $disable = false)
	{
	$itip_sending = $this->rc->config->get('calendar_itip_send_option', 3);

	// itip sending is entirely disabled
	if ($itip_sending === 0) {
	return '';
	}
	// add checkbox to suppress itip reply message
	else if ($itip_sending >= 2) {
	$rsvp_additions = html::label(array('class' => 'noreply-toggle'),
	html::tag('input', array('type' => 'checkbox', 'id' => 'noreply-'.$dom_id, 'value' => 1, 'disabled' => $disable, 'checked' => ($itip_sending & 1) == 0))
	. ' ' . $this->gettext('itipsuppressreply')
	);
	}

	// add input field for reply comment
	$rsvp_additions .= html::a(array('href' => '#toggle', 'class' => 'reply-comment-toggle'), $this->gettext('itipeditresponse'));
	$rsvp_additions .= html::div('itip-reply-comment',
	html::tag('textarea', array('id' => 'reply-comment-'.$dom_id, 'name' => '_comment', 'cols' => 40, 'rows' => 6, 'style' => 'display:none', 'placeholder' => $this->gettext('itipcomment')), '')
	);

	return $rsvp_additions;
	}

	/**
	* Render event/task details in a table
	*/
	function itip_object_details_table($event, $title)
	{
	$table = new html_table(array('cols' => 2, 'border' => 0, 'class' => 'calendar-eventdetails'));
	$table->add('ititle', $title);
	$table->add('title', Q($event['title']));
	if ($event['start'] && $event['end']) {
	- $table->add('label', $this->plugin->gettext('date'), $this->domain);
	+ $table->add('label', $this->gettext('date'));
	$table->add('date', Q($this->lib->event_date_text($event)));
	}
	else if ($event['due'] && $event['_type'] == 'task') {
	- $table->add('label', $this->plugin->gettext('date'), $this->domain);
	+ $table->add('label', $this->gettext('date'));
	$table->add('date', Q($this->lib->event_date_text($event)));
	}
	+ if (!empty($event['recurrence'])) {
	+ $table->add('label', $this->gettext('recurring'));
	+ $table->add('recurrence', $this->lib->recurrence_text($event['recurrence']));
	+ }
	if ($event['location']) {
	- $table->add('label', $this->plugin->gettext('location'), $this->domain);
	+ $table->add('label', $this->gettext('location'));
	$table->add('location', Q($event['location']));
	}
	if ($event['sensitivity'] && $event['sensitivity'] != 'public') {
	- $table->add('label', $this->plugin->gettext('sensitivity'), $this->domain);
	- $table->add('sensitivity', ucfirst($this->plugin->gettext($event['sensitivity'], $this->domain)) . '!');
	+ $table->add('label', $this->gettext('sensitivity'));
	+ $table->add('sensitivity', ucfirst($this->gettext($event['sensitivity'])) . '!');
	}
	if ($event['status'] == 'COMPLETED' \|\| $event['status'] == 'CANCELLED') {
	- $table->add('label', $this->plugin->gettext('status'), $this->domain);
	- $table->add('status', $this->plugin->gettext('status-' . strtolower($event['status']), $this->domain));
	+ $table->add('label', $this->gettext('status'));
	+ $table->add('status', $this->gettext('status-' . strtolower($event['status'])));
	}
	if ($event['comment']) {
	- $table->add('label', $this->plugin->gettext('comment'), $this->domain);
	+ $table->add('label', $this->gettext('comment'));
	$table->add('location', Q($event['comment']));
	}

	return $table->show();
	}


	/**
	* Create iTIP invitation token for later replies via URL
	*
	* @param array Hash array with event properties
	* @param string Attendee email address
	* @return string Invitation token
	*/
	public function store_invitation($event, $attendee)
	{
	// empty stub
	return false;
	}

	/**
	* Mark invitations for the given event as cancelled
	*
	* @param array Hash array with event properties
	*/
	public function cancel_itip_invitation($event)
	{
	// empty stub
	return false;
	}

	/**
	* Utility function to get the value of a custom property
	*/
	public static function get_custom_property($event, $name)
	{
	$ret = false;

	if (is_array($event['x-custom'])) {
	array_walk($event['x-custom'], function($prop, $i) use ($name, &$ret) {
	if (strcasecmp($prop[0], $name) === 0) {
	$ret = $prop[1];
	}
	});
	}

	return $ret;
	}

	}
	diff --git a/plugins/libcalendaring/localization/en_US.inc b/plugins/libcalendaring/localization/en_US.inc
	index 2542c47c..3e49838b 100644
	--- a/plugins/libcalendaring/localization/en_US.inc
	+++ b/plugins/libcalendaring/localization/en_US.inc
	@@ -1,156 +1,157 @@
	<?php

	/**
	* Localizations for the Kolab calendaring utilities plugin
	*
	* Copyright (C) 2014, Kolab Systems AG
	*
	* For translation see https://www.transifex.com/projects/p/kolab/resource/libcalendaring/
	*/

	$labels = array();

	// words for spoken dates
	$labels['until'] = 'until';
	$labels['at'] = 'at';

	// alarms related labels
	$labels['alarmemail'] = 'Send Email';
	$labels['alarmdisplay'] = 'Show message';
	$labels['alarmaudio'] = 'Play sound';
	$labels['alarmdisplayoption'] = 'Message';
	$labels['alarmemailoption'] = 'Email';
	$labels['alarmaudiooption'] = 'Sound';
	$labels['alarmat'] = 'at $datetime';
	$labels['trigger@'] = 'on date';
	$labels['trigger-M'] = 'minutes before';
	$labels['trigger-H'] = 'hours before';
	$labels['trigger-D'] = 'days before';
	$labels['trigger+M'] = 'minutes after';
	$labels['trigger+H'] = 'hours after';
	$labels['trigger+D'] = 'days after';
	$labels['triggerattime'] = 'at time';
	$labels['addalarm'] = 'Add alarm';
	$labels['removealarm'] = 'Remove alarm';

	$labels['alarmtitle'] = 'Upcoming events';
	$labels['dismissall'] = 'Dismiss all';
	$labels['dismiss'] = 'Dismiss';
	$labels['snooze'] = 'Snooze';
	$labels['repeatinmin'] = 'Repeat in $min minutes';
	$labels['repeatinhr'] = 'Repeat in 1 hour';
	$labels['repeatinhrs'] = 'Repeat in $hrs hours';
	$labels['repeattomorrow'] = 'Repeat tomorrow';
	$labels['repeatinweek'] = 'Repeat in a week';

	$labels['showmore'] = 'Show more...';

	// recurrence related labels
	+$labels['recurring'] = 'Repeats';
	$labels['frequency'] = 'Repeat';
	$labels['never'] = 'never';
	$labels['daily'] = 'daily';
	$labels['weekly'] = 'weekly';
	$labels['monthly'] = 'monthly';
	$labels['yearly'] = 'annually';
	$labels['rdate'] = 'on dates';
	$labels['every'] = 'Every';
	$labels['days'] = 'day(s)';
	$labels['weeks'] = 'week(s)';
	$labels['months'] = 'month(s)';
	$labels['years'] = 'year(s)';
	$labels['bydays'] = 'On';
	$labels['untildate'] = 'the';
	$labels['each'] = 'Each';
	$labels['onevery'] = 'On every';
	$labels['onsamedate'] = 'On the same date';
	$labels['forever'] = 'forever';
	$labels['recurrencend'] = 'until';
	$labels['untilenddate'] = 'until date';
	$labels['forntimes'] = 'for $nr time(s)';
	$labels['first'] = 'first';
	$labels['second'] = 'second';
	$labels['third'] = 'third';
	$labels['fourth'] = 'fourth';
	$labels['last'] = 'last';
	$labels['dayofmonth'] = 'Day of month';
	$labels['addrdate'] = 'Add repeat date';
	$labels['except'] = 'except';

	// itip related labels
	$labels['itipinvitation'] = 'Invitation to';
	$labels['itipupdate'] = 'Update of';
	$labels['itipcancellation'] = 'Cancelled:';
	$labels['itipreply'] = 'Reply to';
	$labels['itipaccepted'] = 'Accept';
	$labels['itiptentative'] = 'Maybe';
	$labels['itipdeclined'] = 'Decline';
	$labels['itipdelegated'] = 'Delegate';
	$labels['itipneeds-action'] = 'Postpone';
	$labels['itipcomment'] = 'Your response';
	$labels['itipeditresponse'] = 'Enter a response text';
	$labels['itipsendercomment'] = 'Sender\'s comment: ';
	$labels['itipsuppressreply'] = 'Do not send a response';

	$labels['itipobjectnotfound'] = 'The object referred by this message was not found in your account.';
	$labels['itipsubjectaccepted'] = '"$title" has been accepted by $name';
	$labels['itipsubjecttentative'] = '"$title" has been tentatively accepted by $name';
	$labels['itipsubjectdeclined'] = '"$title" has been declined by $name';
	$labels['itipsubjectin-process'] = '"$title" is in-process by $name';
	$labels['itipsubjectcompleted'] = '"$title" was completed by $name';
	$labels['itipsubjectcancel'] = 'Your participation in "$title" has been cancelled';
	$labels['itipsubjectdelegated'] = '"$title" has been delegated by $name';
	$labels['itipsubjectdelegatedto'] = '"$title" has been delegated to you by $name';

	$labels['itipnewattendee'] = 'This is a reply from a new participant';
	$labels['updateattendeestatus'] = 'Update the participant\'s status';
	$labels['acceptinvitation'] = 'Do you accept this invitation?';
	$labels['acceptattendee'] = 'Accept participant';
	$labels['declineattendee'] = 'Decline participant';
	$labels['declineattendeeconfirm'] = 'Enter a message to the declined participant (optional):';

	$labels['youhaveaccepted'] = 'You have accepted this invitation';
	$labels['youhavetentative'] = 'You have tentatively accepted this invitation';
	$labels['youhavedeclined'] = 'You have declined this invitation';
	$labels['youhavedelegated'] = 'You have delegated this invitation';
	$labels['youhavein-process'] = 'You are working on this assignment';
	$labels['youhavecompleted'] = 'You have completed this assignment';
	$labels['youhaveneeds-action'] = 'Your response to this invitation is still pending';

	$labels['youhavepreviouslyaccepted'] = 'You have previously accepted this invitation';
	$labels['youhavepreviouslytentative'] = 'You have previously accepted this invitation tentatively';
	$labels['youhavepreviouslydeclined'] = 'You have previously declined this invitation';
	$labels['youhavepreviouslydelegated'] = 'You have previously delegated this invitation';
	$labels['youhavepreviouslyin-process'] = 'You have previously reported to work on this assignment';
	$labels['youhavepreviouslycompleted'] = 'You have previously completed this assignment';
	$labels['youhavepreviouslyneeds-action'] = 'Your response to this invitation is still pending';

	$labels['attendeeaccepted'] = 'Participant has accepted';
	$labels['attendeetentative'] = 'Participant has tentatively accepted';
	$labels['attendeedeclined'] = 'Participant has declined';
	$labels['attendeedelegated'] = 'Participant has delegated to $delegatedto';
	$labels['attendeein-process'] = 'Participant is in-process';
	$labels['attendeecompleted'] = 'Participant has completed';
	$labels['notanattendee'] = 'You\'re not listed as an attendee of this object';
	$labels['outdatedinvitation'] = 'This invitation has been replaced by a newer version';

	$labels['importtocalendar'] = 'Save to my calendar';
	$labels['removefromcalendar'] = 'Remove from my calendar';
	$labels['updatemycopy'] = 'Update my copy';
	$labels['openpreview'] = 'Open Preview';

	$labels['deleteobjectconfirm'] = 'Do you really want to delete this object?';
	$labels['declinedeleteconfirm'] = 'Do you also want to delete this declined object from your account?';

	$labels['delegateinvitation'] = 'Delegate Invitation';
	$labels['delegateto'] = 'Delegate to';
	$labels['delegatersvpme'] = 'Keep me informed about updates of this incidence';
	$labels['delegateinvalidaddress'] = 'Please enter a valid email address for the delegate';

	$labels['savingdata'] = 'Saving data...';

	// attendees labels
	$labels['expandattendeegroup'] = 'Substitute with group members';
	$labels['expandattendeegroupnodata'] = 'Unable to substitute this group. No members found.';
	$labels['expandattendeegrouperror'] = 'Unable to substitute this group. It might contain too many members.';
	$labels['expandattendeegroupsizelimit'] = 'This group contains too many members for substituting.';

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