calendar.php
No OneTemporary
Actions

Size

161 KB

Referenced Files

None

Subscribers

None

calendar.php
View Options

	<?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) 2014-2015, 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 = [
	'calendar_default_view' => "agendaWeek",
	'calendar_timeslots' => 2,
	'calendar_work_start' => 6,
	'calendar_work_end' => 18,
	'calendar_agenda_range' => 60,
	'calendar_show_weekno' => 0,
	'calendar_first_day' => 1,
	'calendar_first_hour' => 6,
	'calendar_time_format' => null,
	'calendar_event_coloring' => 0,
	'calendar_time_indicator' => true,
	'calendar_allow_invite_shared' => false,
	'calendar_itip_send_option' => 3,
	'calendar_itip_after_action' => 0,
	];

	// These are implemented with __get()
	// private $ical;
	// private $itip;
	// private $driver;


	/**
	* Plugin initialization.
	*/
	function init()
	{
	$this->rc = rcube::get_instance();

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

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

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

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

	/**
	* Setup basic plugin environment and UI
	*/
	protected function setup()
	{
	$this->require_plugin('libcalendaring');
	$this->require_plugin('libkolab');

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

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

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

	/**
	* 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;
	}

	$this->setup();

	// load Calendar user interface
	if (!$this->rc->output->ajax_call
	&& (empty($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
	$this->register_action('index', [$this, 'calendar_view']);
	$this->register_action('event', [$this, 'event_action']);
	$this->register_action('calendar', [$this, 'calendar_action']);
	$this->register_action('count', [$this, 'count_events']);
	$this->register_action('load_events', [$this, 'load_events']);
	$this->register_action('export_events', [$this, 'export_events']);
	$this->register_action('import_events', [$this, 'import_events']);
	$this->register_action('upload', [$this, 'attachment_upload']);
	$this->register_action('get-attachment', [$this, 'attachment_get']);
	$this->register_action('freebusy-status', [$this, 'freebusy_status']);
	$this->register_action('freebusy-times', [$this, 'freebusy_times']);
	$this->register_action('randomdata', [$this, 'generate_randomdata']);
	$this->register_action('print', [$this,'print_view']);
	$this->register_action('mailimportitip', [$this, 'mail_import_itip']);
	$this->register_action('mailimportattach', [$this, 'mail_import_attachment']);
	$this->register_action('dialog-ui', [$this, 'mail_message2event']);
	$this->register_action('check-recent', [$this, 'check_recent']);
	$this->register_action('itip-status', [$this, 'event_itip_status']);
	$this->register_action('itip-remove', [$this, 'event_itip_remove']);
	$this->register_action('itip-decline-reply', [$this, 'mail_itip_decline_reply']);
	$this->register_action('itip-delegate', [$this, 'mail_itip_delegate']);
	$this->register_action('resources-list', [$this, 'resources_list']);
	$this->register_action('resources-owner', [$this, 'resources_owner']);
	$this->register_action('resources-calendar', [$this, 'resources_calendar']);
	$this->register_action('resources-autocomplete', [$this, 'resources_autocomplete']);
	$this->add_hook('refresh', [$this, 'refresh']);

	// remove undo information...
	if (!empty($_SESSION['calendar_event_undo'])) {
	$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
	$this->add_hook('preferences_sections_list', [$this, 'preferences_sections_list']);
	$this->add_hook('preferences_list', [$this, 'preferences_list']);
	$this->add_hook('preferences_save', [$this, 'preferences_save']);
	}
	else if ($args['task'] == 'mail') {
	// hooks to catch event invitations on incoming mails
	if ($args['action'] == 'show' \|\| $args['action'] == 'preview') {
	$this->add_hook('template_object_messagebody', [$this, 'mail_messagebody_html']);
	}

	// add 'Create event' item to message menu
	if ($this->api->output->type == 'html' && (empty($_GET['_rel']) \|\| $_GET['_rel'] != 'event')) {
	$this->api->output->add_label('calendar.createfrommail');
	$this->api->add_content(
	html::tag('li', ['role' => 'menuitem'],
	$this->api->output->button([
	'command' => 'calendar-create-from-mail',
	'label' => 'calendar.createfrommail',
	'type' => 'link',
	'classact' => 'icon calendarlink active',
	'class' => 'icon calendarlink disabled',
	'innerclass' => 'icon calendar',
	])
	),
	'messagemenu'
	);
	}

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

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

	/**
	* Helper method to load the backend driver according to local config
	*/
	private function load_driver()
	{
	if (!empty($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 (empty($this->itip)) {
	require_once($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(['accepted','tentative','declined','delegated','needs-action']);
	}
	}

	return $this->itip;
	}

	/**
	* Load iCalendar functions
	*/
	public function get_ical()
	{
	if (empty($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($sensitivity = null, $calendars = null)
	{
	if ($calendars === null) {
	$filter = calendar_driver::FILTER_PERSONAL \| calendar_driver::FILTER_WRITEABLE;
	$calendars = $this->driver->list_calendars($filter);
	}

	$default_id = $this->rc->config->get('calendar_default_calendar');
	$calendar = !empty($calendars[$default_id]) ? $calendars[$default_id] : null;
	$first = null;

	if (!$calendar \|\| $sensitivity) {
	foreach ($calendars as $cal) {
	if ($sensitivity && !empty($cal['subtype']) && $cal['subtype'] == $sensitivity) {
	$calendar = $cal;
	break;
	}
	if (!empty($cal['default']) && $cal['editable']) {
	$calendar = $cal;
	}
	if ($cal['editable']) {
	$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 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'
	);

	// initialize attendees autocompletion
	$this->rc->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('identities-selector', $this->ui->identity_select([
	'id' => 'edit-identities-list',
	'aria-label' => $this->gettext('roleorganizer'),
	'class' => 'form-control custom-select',
	]));

	$view = rcube_utils::get_input_value('view', rcube_utils::INPUT_GPC);
	if (in_array($view, ['agendaWeek', 'agendaDay', 'month', 'list'])) {
	$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'] = [
	'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($no_override['calendar_default_view'])) {
	if (empty($p['current'])) {
	$p['blocks']['view']['content'] = true;
	return $p;
	}

	$field_id = 'rcmfd_default_view';
	$view = $this->rc->config->get('calendar_default_view', $this->defaults['calendar_default_view']);

	$select = new html_select(['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'), "list");

	$p['blocks']['view']['options']['default_view'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('default_view'))),
	'content' => $select->show($view == 'table' ? 'list' : $view),
	];
	}

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

	$field_id = 'rcmfd_timeslot';
	$choices = ['1', '2', '3', '4', '6'];
	$timeslots = $this->rc->config->get('calendar_timeslots', $this->defaults['calendar_timeslots']);

	$select = new html_select(['name' => '_timeslots', 'id' => $field_id]);
	$select->add($choices);

	$p['blocks']['view']['options']['timeslots'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('timeslots'))),
	'content' => $select->show(strval($timeslots)),
	];
	}

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

	$field_id = 'rcmfd_firstday';
	$first_day = $this->rc->config->get('calendar_first_day', $this->defaults['calendar_first_day']);

	$select = new html_select(['name' => '_first_day', 'id' => $field_id]);
	$select->add($this->gettext('sunday'), '0');
	$select->add($this->gettext('monday'), '1');
	$select->add($this->gettext('tuesday'), '2');
	$select->add($this->gettext('wednesday'), '3');
	$select->add($this->gettext('thursday'), '4');
	$select->add($this->gettext('friday'), '5');
	$select->add($this->gettext('saturday'), '6');

	$p['blocks']['view']['options']['first_day'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('first_day'))),
	'content' => $select->show(strval($first_day)),
	];
	}

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

	$first_hour = $this->rc->config->get('calendar_first_hour', $this->defaults['calendar_first_hour']);
	$time_format = $this->rc->config->get('calendar_time_format', $this->defaults['calendar_time_format']);
	$time_format = $this->rc->config->get('time_format', libcalendaring::to_php_date_format($time_format));
	$field_id = 'rcmfd_firsthour';

	$select_hours = new html_select(['name' => '_first_hour', 'id' => $field_id]);
	for ($h = 0; $h < 24; $h++) {
	$select_hours->add(date($time_format, mktime($h, 0, 0)), $h);
	}

	$p['blocks']['view']['options']['first_hour'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('first_hour'))),
	'content' => $select_hours->show($first_hour),
	];
	}

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

	$field_id = 'rcmfd_workstart';
	$work_start = $this->rc->config->get('calendar_work_start', $this->defaults['calendar_work_start']);
	$work_end = $this->rc->config->get('calendar_work_end', $this->defaults['calendar_work_end']);

	$p['blocks']['view']['options']['workinghours'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('workinghours'))),
	'content' => html::div('input-group',
	$select_hours->show($work_start, ['name' => '_work_start', 'id' => $field_id])
	. html::span('input-group-append input-group-prepend', html::span('input-group-text',' — '))
	. $select_hours->show($work_end, ['name' => '_work_end', 'id' => $field_id])
	)
	];
	}

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

	$field_id = 'rcmfd_coloring';
	$mode = $this->rc->config->get('calendar_event_coloring', $this->defaults['calendar_event_coloring']);

	$select_colors = new html_select(['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);

	$p['blocks']['view']['options']['eventcolors'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('eventcoloring'))),
	'content' => $select_colors->show($mode),
	];
	}

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

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

	$alarm_type = $alarm_offset = '';

	if (!isset($no_override['calendar_default_alarm_type'])) {
	$field_id = 'rcmfd_alarm';
	$select_type = new html_select(['name' => '_alarm_type', 'id' => $field_id]);
	$select_type->add($this->gettext('none'), '');

	foreach ($this->driver->alarm_types as $type) {
	$select_type->add($this->rc->gettext(strtolower("alarm{$type}option"), 'libcalendaring'), $type);
	}

	$alarm_type = $select_type->show($this->rc->config->get('calendar_default_alarm_type', ''));
	}

	if (!isset($no_override['calendar_default_alarm_offset'])) {
	$field_id = 'rcmfd_alarm';
	$input_value = new html_inputfield(['name' => '_alarm_value', 'id' => $field_id . 'value', 'size' => 3]);
	$select_offset = new html_select(['name' => '_alarm_offset', 'id' => $field_id . 'offset']);

	foreach (['-M','-H','-D','+M','+H','+D'] as $trigger) {
	$select_offset->add($this->rc->gettext('trigger' . $trigger, 'libcalendaring'), $trigger);
	}

	$preset = libcalendaring::parse_alarm_value($this->rc->config->get('calendar_default_alarm_offset', '-15M'));
	$alarm_offset = $input_value->show($preset[0]) . ' ' . $select_offset->show($preset[1]);
	}

	$p['blocks']['view']['options']['alarmtype'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('defaultalarmtype'))),
	'content' => html::div('input-group', $alarm_type . ' ' . $alarm_offset),
	];
	}

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

	// default calendar selection
	$field_id = 'rcmfd_default_calendar';
	$filter = calendar_driver::FILTER_PERSONAL \| calendar_driver::FILTER_ACTIVE \| calendar_driver::FILTER_INSERTABLE;
	$select_cal = new html_select(['name' => '_default_calendar', 'id' => $field_id, 'is_escaped' => true]);

	$default_calendar = null;
	foreach ((array) $this->driver->list_calendars($filter) as $id => $prop) {
	$select_cal->add($prop['name'], strval($id));
	if (!empty($prop['default'])) {
	$default_calendar = $id;
	}
	}

	$p['blocks']['view']['options']['defaultcalendar'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('defaultcalendar'))),
	'content' => $select_cal->show($this->rc->config->get('calendar_default_calendar', $default_calendar)),
	];
	}

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

	$field_id = 'rcmfd_show_weekno';
	$select = new html_select(['name' => '_show_weekno', 'id' => $field_id]);
	$select->add($this->gettext('weeknonone'), -1);
	$select->add($this->gettext('weeknodatepicker'), 0);
	$select->add($this->gettext('weeknoall'), 1);

	$p['blocks']['view']['options']['show_weekno'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('showweekno'))),
	'content' => $select->show(intval($this->rc->config->get('calendar_show_weekno'))),
	];
	}

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

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

	$field_id = 'rcmfd_after_action';
	$select = new html_select([
	'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']);
	$folder = null;

	if ($val !== null && $val !== '' && !is_int($val)) {
	$folder = $val;
	$val = 4;
	}

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

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

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

	if (empty($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);
	$category_remove = html::span('input-group-append',
	html::a([
	'class' => 'button icon delete input-group-text',
	'onclick' => '$(this).parent().parent().remove()',
	'title' => $this->gettext('remove_category'),
	'href' => '#rcmfd_new_category',
	],
	html::span('inner', $this->gettext('delete'))
	)
	);

	$category_name = new html_inputfield(array('name' => "_categories[$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 = '';

	if (!empty($this->driver->categoriesimmutable)) {
	$hidden = html::tag('input', ['type' => 'hidden', 'name' => "_categories[$key]", 'value' => $name]);
	}

	$categories_list .= $hidden
	. html::div('input-group', $category_name->show($name) . $category_color->show($color) . $category_remove);
	}

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

	$field_id = 'rcmfd_new_category';
	$new_category = new html_inputfield(['name' => '_new_category', 'id' => $field_id, 'size' => 30]);
	$add_category = html::span('input-group-append',
	html::a(
	[
	'type' => 'button',
	'class' => 'button create input-group-text',
	'title' => $this->gettext('add_category'),
	'onclick' => 'rcube_calendar_add_category()',
	'href' => '#rcmfd_new_category',
	],
	html::span('inner', $this->gettext('add_category'))
	)
	);

	$p['blocks']['categories']['options']['categories'] = [
	'content' => html::div('input-group', $new_category->show('') . $add_category),
	];

	$this->rc->output->add_label('delete', 'calendar.remove_category');
	$this->rc->output->add_script('
	function rcube_calendar_add_category() {
	var name = $("#rcmfd_new_category").val();
	if (name.length) {
	var button_label = rcmail.gettext("calendar.remove_category");
	var input = $("<input>").attr({type: "text", name: "_categories[]", size: 30, "class": "form-control"}).val(name);
	var color = $("<input>").attr({type: "text", name: "_colors[]", size: 6, "class": "colors form-control"}).val("000000");
	var button = $("<a>").attr({"class": "button icon delete input-group-text", title: button_label, href: "#rcmfd_new_category"})
	.click(function() { $(this).parent().parent().remove(); })
	.append($("<span>").addClass("inner").text(rcmail.gettext("delete")));

	$("<div>").addClass("input-group").append(input).append(color).append($("<span class=\'input-group-append\'>").append(button))
	.appendTo("#calendarcategories");
	color.minicolors(rcmail.env.minicolors_config \|\| {});
	$("#rcmfd_new_category").val("");
	}
	}',
	'foot'
	);

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

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

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

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

	$sources = [];
	$checkbox = new html_checkbox(['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')) ? $source['id'] : '';
	$sources[] = html::tag('li', null,
	html::label(null,
	$checkbox->show($active, ['value' => $source['id']])
	. rcube::Q(!empty($source['realname']) ? $source['realname'] : $source['name'])
	)
	);
	}

	$p['blocks']['birthdays']['options']['birthday_adressbooks'] = [
	'title' => rcube::Q($this->gettext('birthdayscalendarsources')),
	'content' => html::tag('ul', 'proplist', implode("\n", $sources)),
	];

	$field_id = 'rcmfd_birthdays_alarm';
	$select_type = new html_select(['name' => '_birthdays_alarm_type', 'id' => $field_id] + $input_attrib);
	$select_type->add($this->gettext('none'), '');

	foreach ($this->driver->alarm_types as $type) {
	$select_type->add($this->rc->gettext(strtolower("alarm{$type}option"), 'libcalendaring'), $type);
	}

	$input_value = new html_inputfield(['name' => '_birthdays_alarm_value', 'id' => $field_id . 'value', 'size' => 3] + $input_attrib);
	$select_offset = new html_select(['name' => '_birthdays_alarm_offset', 'id' => $field_id . 'offset'] + $input_attrib);

	foreach (['-M','-H','-D'] as $trigger) {
	$select_offset->add($this->rc->gettext('trigger' . $trigger, 'libcalendaring'), $trigger);
	}

	$preset = libcalendaring::parse_alarm_value($this->rc->config->get('calendar_birthdays_alarm_offset', '-1D'));
	$preset_type = $this->rc->config->get('calendar_birthdays_alarm_type', '');

	$p['blocks']['birthdays']['options']['birthdays_alarmoffset'] = [
	'title' => html::label($field_id, rcube::Q($this->gettext('showalarms'))),
	'content' => html::div('input-group',
	$select_type->show($preset_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'] = [
	'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_show_weekno' => intval(rcube_utils::get_input_value('_show_weekno', 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' => (bool) rcube_utils::get_input_value('_contact_birthdays', rcube_utils::INPUT_POST),
	'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 (empty($this->driver->nocategories)) {
	$old_categories = $new_categories = [];

	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 => $name) {
	if (!isset($colors[$key])) {
	continue;
	}

	$color = preg_replace('/^#/', '', strval($colors[$key]));

	// rename categories in existing events -> driver's job
	if (!empty($old_categories[$key])) {
	$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 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 = false;
	$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', ['id' => $cal['id']]);
	}
	break;

	case "subscribe":
	if (!$this->driver->subscribe_calendar($cal)) {
	$this->rc->output->show_message($this->gettext('errorsaving'), 'error');
	}
	else {
	$calendars = $this->driver->list_calendars();
	$calendar = !empty($calendars[$cal['id']]) ? $calendars[$cal['id']] : null;

	// find parent folder and check if it's a "user calendar"
	// if it's also activated we need to refresh it (#5340)
	while (!empty($calendar['parent'])) {
	if (isset($calendars[$calendar['parent']])) {
	$calendar = $calendars[$calendar['parent']];
	}
	else {
	break;
	}
	}

	if ($calendar && $calendar['id'] != $cal['id']
	&& !empty($calendar['active'])
	&& $calendar['group'] == "other user"
	) {
	$this->rc->output->command('plugin.refresh_source', $calendar['id']);
	}
	}
	return;

	case "search":
	$results = [];
	$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 (!empty($this->driver->search_more_results)) {
	$this->rc->output->show_message('autocompletemore', 'notice');
	}

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

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

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

	// load main event if savemode is 'all' or if deleting 'future' events
	if (($event['_savemode'] == 'all' \|\| ($event['_savemode'] == 'future' && $action == 'remove' && empty($event['_decline'])))
	&& !empty($old['recurrence_id'])
	) {
	$old['id'] = $old['recurrence_id'];
	$old = $this->driver->get_event($old);
	}
	}

	switch ($action) {
	case "new":
	// create UID for new event
	$event['uid'] = $this->generate_uid();
	if (!$this->write_preprocess($event, $action)) {
	$got_msg = true;
	}
	else if ($success = $this->driver->new_event($event)) {
	$event['id'] = $event['uid'];
	$event['_savemode'] = 'all';

	$this->cleanup_event($event);
	$this->event_save_success($event, null, $action, true);
	}

	$reload = $success && !empty($event['recurrence']) ? 2 : 1;
	break;

	case "edit":
	if (!$this->write_preprocess($event, $action)) {
	$got_msg = true;
	}
	else if ($success = $this->driver->edit_event($event)) {
	$this->cleanup_event($event);
	$this->event_save_success($event, $old, $action, $success);
	}

	$reload = $success && (!empty($event['recurrence']) \|\| !empty($event['_savemode']) \|\| !empty($event['_fromcalendar'])) ? 2 : 1;
	break;

	case "resize":
	if (!$this->write_preprocess($event, $action)) {
	$got_msg = true;
	}
	else if ($success = $this->driver->resize_event($event)) {
	$this->event_save_success($event, $old, $action, $success);
	}

	$reload = !empty($event['_savemode']) ? 2 : 1;
	break;

	case "move":
	if (!$this->write_preprocess($event, $action)) {
	$got_msg = true;
	}
	else if ($success = $this->driver->move_event($event)) {
	$this->event_save_success($event, $old, $action, $success);
	}

	$reload = $success && !empty($event['_savemode']) ? 2 : 1;
	break;

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

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

	// Note: the driver is responsible for setting $_SESSION['calendar_event_undo']
	// containing 'ts' and 'data' elements
	$success = $this->driver->remove_event($event, $undo_time < 1);
	$reload = (!$success \|\| !empty($event['_savemode'])) ? 2 : 1;

	if ($undo_time > 0 && $success) {
	// display message with Undo link.
	$onclick = sprintf("%s.http_request('event', 'action=undo', %s.display_message('', 'loading'))",
	rcmail_output::JS_OBJECT_NAME,
	rcmail_output::JS_OBJECT_NAME
	);
	$msg = html::span(null, $this->gettext('successremoval'))
	. ' ' . html::a(['onclick' => $onclick], $this->gettext('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 cancellation for the main event
	if ($event['_savemode'] == 'all') {
	unset($old['_instance'], $old['recurrence_date'], $old['recurrence_id']);
	}
	// send an update for the main event's recurrence rule instead of a cancellation message
	else if ($event['_savemode'] == 'future' && $success !== false && $success !== true) {
	$event['_savemode'] = 'all'; // force event_save_success() to load master event
	$action = 'edit';
	$success = true;
	}

	// send iTIP reply that participant has declined the event
	if ($success && !empty($event['_decline'])) {
	$emails = $this->get_user_emails();
	$organizer = null;

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

	if ($event['_savemode'] == 'future' && $event['id'] != $old['id']) {
	$old['thisandfuture'] = true;
	}

	$itip = $this->load_itip();
	$itip->set_sender_email($reply_sender);

	if ($organizer && $itip->send_itip_message($old, 'REPLY', $organizer, 'itipsubjectdeclined', 'itipmailbodydeclined')) {
	$mailto = !empty($organizer['name']) ? $organizer['name'] : $organizer['email'];
	$msg = $this->gettext(['name' => 'sentresponseto', 'vars' => ['mailto' => $mailto]]);

	$this->rc->output->command('display_message', $msg, 'confirmation');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}
	}
	else if ($success) {
	$this->event_save_success($event, $old, $action, $success);
	}

	break;

	case "undo":
	// Restore deleted event
	if (!empty($_SESSION['calendar_event_undo']['data'])) {
	$event = $_SESSION['calendar_event_undo']['data'];
	$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_POST);
	$attendees = rcube_utils::get_input_value('attendees', rcube_utils::INPUT_POST);
	$reply_comment = $event['comment'];

	$this->write_preprocess($event, 'edit');
	$ev = $this->driver->get_event($event);
	$ev['attendees'] = $event['attendees'];
	$ev['free_busy'] = $event['free_busy'];
	$ev['_savemode'] = $event['_savemode'];
	$ev['comment'] = $reply_comment;

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

	$event = $ev;

	// compose a list of attendees affected by this change
	$updated_attendees = array_filter(array_map(function($j) use ($event) {
	return $event['attendees'][$j];
	},
	$attendees
	));

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

	foreach ($event['attendees'] as $i => $attendee) {
	if ($attendee['role'] == 'ORGANIZER') {
	$organizer = $attendee;
	}
	else if (!empty($attendee['email']) && in_array_nocase($attendee['email'], $emails)) {
	$reply_sender = $attendee['email'];
	}
	else if (!empty($attendee['cutype']) && $attendee['cutype'] == 'RESOURCE' && !empty($attendee['email']) && in_array_nocase($attendee['email'], $ownedResourceEmails)) {
	$resourceConfirmation = true;
	// Note on behalf of which resource this update is going to be sent out
	$event['_resource'] = $attendee['email'];
	}
	}

	if (!$noreply) {
	$itip = $this->load_itip();
	$itip->set_sender_email($reply_sender);
	$event['thisandfuture'] = $event['_savemode'] == 'future';
	$bodytextprefix = $resourceConfirmation ? 'itipmailbodyresource' : 'itipmailbody';

	if ($organizer && $itip->send_itip_message($event, 'REPLY', $organizer, 'itipsubject' . $status, $bodytextprefix . $status)) {
	$mailto = !empty($organizer['name']) ? $organizer['name'] : $organizer['email'];
	$msg = $this->gettext(['name' => 'sentresponseto', 'vars' => ['mailto' => $mailto]]);

	$this->rc->output->command('display_message', $msg, 'confirmation');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}
	}

	// refresh all calendars
	if ($event['calendar'] != $ev['calendar']) {
	$this->rc->output->command('plugin.refresh_calendar', ['source' => null, 'refetch' => true]);
	$reload = 0;
	}
	}

	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;
	$dtformat = $this->rc->config->get('date_format') . ' ' . $this->rc->config->get('time_format');
	array_walk($data, function(&$change) use ($lib, $dtformat) {
	if (!empty($change['date'])) {
	$dt = $lib->adjust_timezone($change['date']);

	if ($dt instanceof DateTime) {
	$change['date'] = $this->rc->format_date($dt, $dtformat, false);
	}
	}
	});

	$this->rc->output->command('plugin.render_event_changelog', $data);
	}
	else {
	$this->rc->output->command('plugin.render_event_changelog', false);
	}

	$got_msg = true;
	$reload = false;

	break;

	case "diff":
	$data = $this->driver->get_event_diff($event, $event['rev1'], $event['rev2']);
	if (is_array($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 (['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('objectdiffnotavailable'), '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('objectnotfound'), 'error');
	}

	$got_msg = true;
	$reload = false;
	break;

	case "restore":
	if ($success = $this->driver->restore_event_revision($event, $event['rev'])) {
	$_event = $this->driver->get_event($event);
	$reload = $_event['recurrence'] ? 2 : 1;
	$msg = $this->gettext(['name' => 'objectrestoresuccess', 'vars' => ['rev' => $event['rev']]]);
	$this->rc->output->command('display_message', $msg, 'confirmation');
	$this->rc->output->command('plugin.close_history_dialog');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('objectrestoreerror'), 'error');
	$reload = 0;
	}

	$got_msg = true;
	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');
	}
	}

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

	// update event object on the client or trigger a complete refresh if too complicated
	if ($reload && empty($_REQUEST['_framed'])) {
	$args = ['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);
	}
	}

	/**
	* Helper method sending iTip notifications after successful event updates
	*/
	private function event_save_success(&$event, $old, $action, $success)
	{
	// $success is a new event ID
	if ($success !== true) {
	// send update notification on the main event
	if ($event['_savemode'] == 'future' && !empty($event['_notify'])
	&& !empty($old['attendees']) && !empty($old['recurrence_id'])
	) {
	$master = $this->driver->get_event(['id' => $old['recurrence_id'], 'calendar' => $old['calendar']], 0, true);
	unset($master['_instance'], $master['recurrence_date']);

	$sent = $this->notify_attendees($master, null, $action, $event['_comment'], false);
	if ($sent < 0) {
	$this->rc->output->show_message('calendar.errornotifying', 'error');
	}

	$event['attendees'] = $master['attendees']; // this tricks us into the next if clause
	}

	// delete old reference if saved as new
	if ($event['_savemode'] == 'future' \|\| $event['_savemode'] == 'new') {
	$old = null;
	}

	$event['id'] = $success;
	$event['_savemode'] = 'all';
	}

	// send out notifications
	if (!empty($event['_notify']) && (!empty($event['attendees']) \|\| !empty($old['attendees']))) {
	$_savemode = $event['_savemode'];

	// send notification for the main event when savemode is 'all'
	if ($action != 'remove' && $_savemode == 'all'
	&& (!empty($event['recurrence_id']) \|\| !empty($old['recurrence_id']) \|\| ($old && $old['id'] != $event['id']))
	) {
	if (!empty($event['recurrence_id'])) {
	$event['id'] = $event['recurrence_id'];
	}
	else if (!empty($old['recurrence_id'])) {
	$event['id'] = $old['recurrence_id'];
	}
	else {
	$event['id'] = $old['id'];
	}
	$event = $this->driver->get_event($event, 0, true);
	unset($event['_instance'], $event['recurrence_date']);
	}
	else {
	// make sure we have the complete record
	$event = $action == 'remove' ? $old : $this->driver->get_event($event, 0, true);
	}

	$event['_savemode'] = $_savemode;

	if ($old) {
	$old['thisandfuture'] = $_savemode == 'future';
	}

	// only notify if data really changed (TODO: do diff check on client already)
	if (!$old \|\| $action == 'remove' \|\| self::event_diff($event, $old)) {
	$comment = isset($event['_comment']) ? $event['_comment'] : null;
	$sent = $this->notify_attendees($event, $old, $action, $comment);

	if ($sent > 0) {
	$this->rc->output->show_message('calendar.itipsendsuccess', 'confirmation');
	}
	else if ($sent < 0) {
	$this->rc->output->show_message('calendar.errornotifying', 'error');
	}
	}
	}
	}

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

	$events = $this->driver->load_events($start, $end, $query, $source);
	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);
	$source = rcube_utils::get_input_value('source', rcube_utils::INPUT_GET);
	$end = rcube_utils::get_input_value('end', rcube_utils::INPUT_GET);

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

	$counts = $this->driver->count_events($source, $start, $end);

	$this->rc->output->command('plugin.update_counts', ['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 = [];

	if ($event = $this->lib->mail_get_itip_object($mbox, $uid, $mime_id, 'event')) {
	$partstat = 'NEEDS-ACTION';

	$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'])) {
	// Some installations can't handle all occurrences (aborting the request w/o an error in log)
	$freq = !empty($event['recurrence']['FREQ']) ? $event['recurrence']['FREQ'] : null;
	$end = clone $event['start'];
	$end->add(new DateInterval($freq == 'DAILY' ? 'P1Y' : 'P10Y'));

	foreach ($this->driver->get_recurring_events($event, $event['start'], $end) as $recurring) {
	$recurring['temporary'] = true;
	$recurring['readonly'] = true;
	$recurring['calendar'] = '--invitation--itip';

	$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', ['refetch' => true]);
	return;
	}

	$counts = [];

	foreach ($this->driver->list_calendars(calendar_driver::FILTER_ACTIVE) 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',
	['source' => $cal['id'], 'update' => $this->_client_event($event)]
	);
	}

	// refresh count for this calendar
	if (!empty($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', ['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();

	$time = !empty($p['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 ($alarm && !empty($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
	*/
	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'])) {
	$this->rc->upload_progress();
	}

	@set_time_limit(0);

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

	if (!$err && !empty($_FILES['_data']['tmp_name'])) {
	$calendar = rcube_utils::get_input_value('calendar', rcube_utils::INPUT_GPC);
	$rangestart = !empty($_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(['name' => 'importsuccess', 'vars' => ['nr' => $count]]), 'confirmation');
	$this->rc->output->command('plugin.import_success', ['source' => $calendar, 'refetch' => true]);
	}
	else if (!$errors) {
	$this->rc->output->command('display_message', $this->gettext('importnone'), 'notice');
	$this->rc->output->command('plugin.import_success', ['source' => $calendar]);
	}
	else {
	$this->rc->output->command('plugin.import_error', ['message' => $this->gettext('importerror') . ($msg ? ': ' . $msg : '')]);
	}
	}
	else {
	if ($err == UPLOAD_ERR_INI_SIZE \|\| $err == UPLOAD_ERR_FORM_SIZE) {
	$max = $this->rc->show_bytes(parse_bytes(ini_get('upload_max_filesize')));
	$msg = $this->rc->gettext(['name' => 'filesizeerror', 'vars' => ['size' => $max]]);
	}
	else {
	$msg = $this->rc->gettext('fileuploaderror');
	}

	$this->rc->output->command('plugin.import_error', ['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 $rangestart
	if ($rangestart && $event['end'] < $rangestart
	&& (empty($event['recurrence']) \|\| (!empty($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);
	$event_id = rcube_utils::get_input_value('id', rcube_utils::INPUT_GET);
	$attachments = rcube_utils::get_input_value('attachments', rcube_utils::INPUT_GET);
	$calid = rcube_utils::get_input_value('source', 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');
	}

	$filename = $calid;
	$calendars = $this->driver->list_calendars();
	$events = [];

	if (!empty($calendars[$calid])) {
	$filename = !empty($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(['calendar' => $calid, 'id' => $event_id], 0, true)) {
	if (!empty($event['recurrence_id'])) {
	$event = $this->driver->get_event(['calendar' => $calid, 'id' => $event['recurrence_id']], 0, true);
	}

	$events = [$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, $attachments ? [$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', [
	'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="Kolab 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->setup();
	$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 = [];

	// configuration
	$settings['default_view'] = (string) $this->rc->config->get('calendar_default_view', $this->defaults['calendar_default_view']);
	$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['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['itip_notify'] = (int) $this->rc->config->get('calendar_itip_send_option', $this->defaults['calendar_itip_send_option']);
	$settings['show_weekno'] = (int) $this->rc->config->get('calendar_show_weekno', $this->defaults['calendar_show_weekno']);
	$settings['default_calendar'] = $this->rc->config->get('calendar_default_calendar');
	$settings['invitation_calendars'] = (bool) $this->rc->config->get('kolab_invitation_calendars', false);

	// 'table' view has been replaced by 'list' view
	if ($settings['default_view'] == 'table') {
	$settings['default_view'] = 'list';
	}

	// get user identity to create default attendee
	if ($this->ui->screen == 'calendar') {
	foreach ($this->rc->user->list_emails() as $rec) {
	if (empty($identity)) {
	$identity = $rec;
	}

	$identity['emails'][] = $rec['email'];
	$settings['identities'][$rec['identity_id']] = $rec['email'];
	}

	$identity['emails'][] = $this->rc->user->get_username();
	$identity['ownedResources'] = $this->owned_resources_emails();
	$settings['identity'] = [
	'name' => $identity['name'],
	'email' => strtolower($identity['email']),
	'emails' => ';' . strtolower(join(';', $identity['emails'])),
	'ownedResources' => ';' . strtolower(join(';', $identity['ownedResources']))
	];
	}

	// freebusy token authentication URL
	if (($url = $this->rc->config->get('calendar_freebusy_session_auth_url'))
	&& ($uniqueid = $this->rc->config->get('kolab_uniqueid'))
	) {
	if ($url === true) {
	$url = '/freebusy';
	}
	$url = rtrim(rcube_utils::resolve_url($url), '/ ');
	$url .= '/' . urlencode($this->rc->get_user_name());
	$url .= '/' . urlencode($uniqueid);

	$settings['freebusy_url'] = $url;
	}

	return $settings;
	}

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

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

	if (!empty($event['recurrence'])) {
	$event['recurrence_text'] = $this->lib->recurrence_text($event['recurrence']);
	$event['recurrence'] = $this->lib->to_client_recurrence($event['recurrence'], $event['allday']);
	unset($event['recurrence_date']);
	}

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

	unset($event['attachments'][$k]['data'], $event['attachments'][$k]['content']);

	if (empty($attachment['id'])) {
	$event['attachments'][$k]['id'] = $k;
	}
	}
	}

	// 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 = $attendee;
	}
	if (!empty($attendee['status']) && $attendee['status'] == 'DELEGATED' && empty($attendee['rsvp'])) {
	$event['attendees'][$i]['noreply'] = true;
	}
	else {
	unset($event['attendees'][$i]['noreply']);
	}
	}

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

	// Convert HTML description into plain text
	if ($this->is_html($event)) {
	$h2t = new rcube_html2text($event['description'], false, true, 0);
	$event['description'] = trim($h2t->get_text());
	}

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

	$event['className'] = !empty($event['className']) ? explode(' ', $event['className']) : [];

	if ($event['allDay']) {
	$event['end'] = $event['end']->add(new DateInterval('P1D'));
	}

	if (!empty($_GET['mode']) && $_GET['mode'] == 'print') {
	$event['editable'] = false;
	}

	return [
	'_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'], $event['allDay'])->format('c'),
	// 'changed' might be empty for event recurrences (Bug #2185)
	'changed' => !empty($event['changed']) ? $this->lib->adjust_timezone($event['changed'])->format('c') : null,
	'created' => !empty($event['created']) ? $this->lib->adjust_timezone($event['created'])->format('c') : null,
	'title' => strval($event['title']),
	'description' => strval($event['description']),
	'location' => strval($event['location']),
	] + $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);

	$num = !empty($_REQUEST['_num']) ? intval($_REQUEST['_num']) : 100;
	$date = !empty($_REQUEST['_date']) ? $_REQUEST['_date'] : 'now';
	$dev = !empty($_REQUEST['_dev']) ? $_REQUEST['_dev'] : 30;
	$cats = array_keys($this->driver->list_categories());
	$cals = $this->driver->list_calendars(calendar_driver::FILTER_ACTIVE);
	$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([
	'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()
	{
	$handler = new kolab_attachments_handler();
	$handler->attachment_upload(self::SESSION_KEY, 'cal-');
	}

	/**
	* Handler for attachments download/displaying
	*/
	public function attachment_get()
	{
	$handler = new kolab_attachments_handler();

	// show loading page
	if (!empty($_GET['_preload'])) {
	return $handler->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);
	$rev = rcube_utils::get_input_value('_rev', rcube_utils::INPUT_GPC);

	$event = ['id' => $event_id, 'calendar' => $calendar, 'rev' => $rev];

	if ($calendar == '--invitation--itip') {
	$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GPC);
	$part = rcube_utils::get_input_value('_part', rcube_utils::INPUT_GPC);
	$mbox = rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_GPC);

	$event = $this->lib->mail_get_itip_object($mbox, $uid, $part, 'event');
	$attachment = $event['attachments'][$id];
	$attachment['body'] = &$attachment['data'];
	}
	else {
	$attachment = $this->driver->get_attachment($id, $event);
	}

	// show part page
	if (!empty($_GET['_frame'])) {
	$handler->attachment_page($attachment);
	}
	// deliver attachment content
	else if ($attachment) {
	if ($calendar != '--invitation--itip') {
	$attachment['body'] = $this->driver->get_attachment_body($id, $event);
	}

	$handler->attachment_get($attachment);
	}

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

	/**
	* Determine whether the given event description is HTML formatted
	*/
	private function is_html($event)
	{
	// check for opening and closing <html> or <body> tags
	return preg_match('/<(html\|body)(\s+[a-z]\|>)/', $event['description'], $m)
	&& strpos($event['description'], '</'.$m[1].'>') > 0;
	}

	/**
	* Prepares new/edited event properties before save
	*/
	private function write_preprocess(&$event, $action)
	{
	// Remove double timezone specification (T2313)
	$event['start'] = preg_replace('/\s$.$/', '', $event['start']);
	$event['end'] = preg_replace('/\s$.$/', '', $event['end']);

	// 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);
	$event['allday'] = !empty($event['allDay']);
	unset($event['allDay']);

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

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

	// align start date with the first occurrence
	if (!empty($event['recurrence']) && !empty($event['syncstart'])
	&& (empty($event['_savemode']) \|\| $event['_savemode'] == 'all')
	) {
	$next = $this->find_first_occurrence($event);

	if (!$next) {
	$this->rc->output->show_message('calendar.recurrenceerror', 'error');
	return false;
	}
	else if ($event['start'] != $next) {
	$diff = $event['start']->diff($event['end'], true);

	$event['start'] = $next;
	$event['end'] = clone $next;
	$event['end']->add($diff);
	}
	}
	}

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

	$attachments = [];
	$eventid = 'cal-' . (!empty($event['id']) ? $event['id'] : 'new');

	if (!empty($_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 => $attachment) {
	if (!empty($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' \|\| $action == 'edit') {
	if (empty($event['attendees'])) {
	$event['attendees'] = [];
	}

	$emails = $this->get_user_emails();
	$organizer = $owner = false;

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

	if (!empty($event['_identity'])) {
	$identity = $this->rc->user->get_identity($event['_identity']);
	}

	// set new organizer identity
	if ($organizer !== false && !empty($identity)) {
	$event['attendees'][$organizer]['name'] = $identity['name'];
	$event['attendees'][$organizer]['email'] = $identity['email'];
	}
	// set owner as organizer if yet missing
	else if ($organizer === false && $owner !== false) {
	$event['attendees'][$owner]['role'] = 'ORGANIZER';
	unset($event['attendees'][$owner]['rsvp']);
	}
	// fallback to the selected identity
	else if ($organizer === false && !empty($identity)) {
	$event['attendees'][] = [
	'role' => 'ORGANIZER',
	'name' => $identity['name'],
	'email' => $identity['email'],
	];
	}
	}

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

	return true;
	}

	/**
	* 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', ['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, $rsvp = null)
	{
	$is_cancelled = false;
	if ($action == 'remove' \|\| ($event['status'] == 'CANCELLED' && $old['status'] != $event['status'])) {
	$event['cancelled'] = true;
	$is_cancelled = true;
	}

	if ($rsvp === null) {
	$rsvp = !$old \|\| $event['sequence'] > $old['sequence'];
	}

	$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;

	// set a valid recurrence-id if this is a recurrence instance
	libcalendaring::identify_recurrence_instance($event);

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

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

	// send to every attendee
	$sent = 0;
	$current = [];
	foreach ((array) $event['attendees'] as $attendee) {
	// skip myself for obvious reasons
	if (empty($attendee['email']) \|\| in_array(strtolower($attendee['email']), $emails)) {
	continue;
	}

	$current[] = strtolower($attendee['email']);

	// skip if notification is disabled for this attendee
	if (!empty($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;
	}
	}

	// TODO: on change of a recurring (main) event, also send updates to differing attendess of recurrence exceptions

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

	$vevent = $old;
	$vevent['cancelled'] = $is_cancelled;
	$vevent['attendees'] = [$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 = $this->input_timestamp('start', rcube_utils::INPUT_GPC);
	$end = $this->input_timestamp('end', rcube_utils::INPUT_GPC);

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

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

	// 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) && !empty($fbtypemap[$type]) ? $fbtypemap[$type] : 'BUSY';
	break;
	}
	}
	}

	// let this information be cached for 5min
	$this->rc->output->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 = $this->input_timestamp('start', rcube_utils::INPUT_GPC);
	$end = $this->input_timestamp('end', rcube_utils::INPUT_GPC);
	$interval = intval(rcube_utils::get_input_value('interval', rcube_utils::INPUT_GPC));
	$strformat = $interval > 60 ? 'Ymd' : 'YmdHis';

	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 = '';

	// prepare freebusy list before use (for better performance)
	if (is_array($fblist)) {
	foreach ($fblist as $idx => $slot) {
	list($from, $to, ) = $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
	$fblist[$idx][0] -= $this->gmt_offset;
	$fblist[$idx][1] -= $this->gmt_offset;
	}
	}
	}

	// build a list from $start till $end with blocks representing the fb-status
	for ($s = 0, $t = $start; $t <= $end; $s++) {
	$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;

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

	// use most compact format, assume $status is one digit/character
	$slots .= $status;
	$t = $t_end;
	}

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

	// let this information be cached for 5min
	$this->rc->output->future_expire_header(300);

	echo rcube_output::json_serialize([
	'email' => $email,
	'start' => $dts->format('c'),
	'end' => $dte->format('c'),
	'interval' => $interval,
	'slots' => $slots,
	]);
	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, ['agendaWeek', 'agendaDay', 'month', 'list'])) {
	$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 ($search = rcube_utils::get_input_value('search', rcube_utils::INPUT_GPC)) {
	$this->rc->output->set_env('search', $search);
	$title .= ' "' . $search . '"';
	}

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

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

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

	/**
	* 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 = [];
	$ignore = ['changed' => 1, 'attachments' => 1];

	foreach (array_unique(array_merge(array_keys($a), array_keys($b))) as $key) {
	if (empty($ignore[$key]) && $key[0] != '_') {
	$av = isset($a[$key]) ? $a[$key] : null;
	$bv = isset($b[$key]) ? $b[$key] : null;

	if ($av != $bv) {
	$diff[] = $key;
	}
	}
	}

	// only compare number of attachments
	$ac = !empty($a['attachments']) ? count($a['attachments']) : 0;
	$bc = !empty($b['attachments']) ? count($b['attachments']) : 0;

	if ($ac != $bc) {
	$diff[] = 'attachments';
	}

	return $diff;
	}

	/**
	* Update attendee properties on the given event object
	*
	* @param array The event object to be altered
	* @param array List of hash arrays each represeting an updated/added attendee
	*/
	public static function merge_attendee_data(&$event, $attendees, $removed = null)
	{
	if (!empty($attendees) && !is_array($attendees[0])) {
	$attendees = [$attendees];
	}

	foreach ($attendees as $attendee) {
	$found = false;

	foreach ($event['attendees'] as $i => $candidate) {
	if ($candidate['email'] == $attendee['email']) {
	$event['attendees'][$i] = $attendee;
	$found = true;
	break;
	}
	}

	if (!$found) {
	$event['attendees'][] = $attendee;
	}
	}

	// filter out removed attendees
	if (!empty($removed)) {
	$event['attendees'] = array_filter($event['attendees'], function($attendee) use ($removed) {
	return !in_array($attendee['email'], $removed);
	});
	}
	}

	/** Resource management functions **/

	/**
	* Getter for the configured implementation of the resource directory interface
	*/
	private function resources_directory()
	{
	if (!empty($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 = [];

	if ($directory = $this->resources_directory()) {
	foreach ($directory->load_resources($search, $maxnum) as $rec) {
	$results[] = [
	'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 = [];

	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 = [];

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

	$events = $directory->get_resource_calendar($id, $start, $end);
	}

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

	/**
	* List email addressed of owned resources
	*/
	private function owned_resources_emails()
	{
	$results = [];
	if ($directory = $this->resources_directory()) {
	foreach ($directory->load_resources($_SESSION['kolab_dn'], 5000, 'owner') as $rec) {
	$results[] = $rec['email'];
	}
	}
	return $results;
	}


	/** Event invitation plugin hooks **/

	/**
	* Find an event in user calendars
	*/
	protected function find_event($event, &$mode)
	{
	$this->load_driver();

	// We search for writeable calendars in personal namespace by default
	$mode = calendar_driver::FILTER_WRITEABLE \| calendar_driver::FILTER_PERSONAL;
	$result = $this->driver->get_event($event, $mode);
	// ... now check shared folders if not found
	if (!$result) {
	$result = $this->driver->get_event($event, calendar_driver::FILTER_WRITEABLE \| calendar_driver::FILTER_SHARED);
	if ($result) {
	$mode \|= calendar_driver::FILTER_SHARED;
	}
	}

	return $result;
	}

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

	$this->load_driver();

	// find local copy of the referenced event (in personal namespace)
	$existing = $this->find_event($data, $mode);
	$is_shared = $mode & calendar_driver::FILTER_SHARED;
	$itip = $this->load_itip();
	$response = $itip->get_itip_status($data, $existing);

	// get a list of writeable calendars to save new events to
	if (
	(!$existing \|\| $is_shared)
	&& empty($data['nosave'])
	&& ($response['action'] == 'rsvp' \|\| $response['action'] == 'import')
	) {
	$calendars = $this->driver->list_calendars($mode);
	$calendar_select = new html_select([
	'name' => 'calendar',
	'id' => 'itip-saveto',
	'is_escaped' => true,
	'class' => 'form-control custom-select'
	]);

	$calendar_select->add('--', '');
	$numcals = 0;
	foreach ($calendars as $calendar) {
	if (!empty($calendar['editable'])) {
	$calendar_select->add($calendar['name'], $calendar['id']);
	$numcals++;
	}
	}
	if ($numcals < 1) {
	$calendar_select = null;
	}
	}

	if (!empty($calendar_select)) {
	$default_calendar = $this->get_default_calendar($data['sensitivity'], $calendars);
	$response['select'] = html::span('folder-select', $this->gettext('saveincalendar')
	. ' '
	. $calendar_select->show($is_shared ? $existing['calendar'] : $default_calendar['id'])
	);
	}
	else if (!empty($data['nosave'])) {
	$response['select'] = html::tag('input', ['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(calendar_driver::FILTER_PERSONAL);
	$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 = $after = [];
	foreach ($events as $event) {
	// TODO: skip events with free_busy == 'free' ?
	if ($event['uid'] == $data['uid']
	\|\| $event['end'] < $day_start \|\| $event['start'] > $day_end
	\|\| $event['status'] == 'CANCELLED'
	\|\| (!empty($event['className']) && strpos($event['className'], 'declined') !== false)
	) {
	continue;
	}

	if ($event['start'] < $event_start) {
	$before[] = $this->mail_agenda_event_row($event);
	}
	else {
	$after[] = $this->mail_agenda_event_row($event);
	}
	}

	$response['append'] = [
	'selector' => '.calendar-agenda-preview',
	'replacements' => [
	'%before%' => !empty($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()
	{
	$uid = rcube_utils::get_input_value('uid', rcube_utils::INPUT_POST);
	$instance = rcube_utils::get_input_value('_instance', rcube_utils::INPUT_POST);
	$savemode = rcube_utils::get_input_value('_savemode', rcube_utils::INPUT_POST);
	$listmode = calendar_driver::FILTER_WRITEABLE \| calendar_driver::FILTER_PERSONAL;
	$success = false;

	// search for event if only UID is given
	if ($event = $this->driver->get_event(['uid' => $uid, '_instance' => $instance], $listmode)) {
	$event['_savemode'] = $savemode;
	$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)
	{
	$this->setup();

	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 (!empty($invitation['cancelled'])) {
	$this->invitestatus = html::div('rsvp-status declined', $itip->gettext('eventcancelled'));
	}
	// save submitted RSVP status
	else if (!empty($_POST['rsvp'])) {
	$status = null;
	foreach (['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...
	// FIXME: we should really consider removing this functionality
	// it's confusing that it creates/updates an event only for logged-in user
	// what if the logged-in user is not the same as the attendee?
	if ($this->rc->user->ID) {
	$this->load_driver();

	$invitation = $itip->get_invitation($token);
	$existing = $this->driver->get_event($this->event);

	// save the event to his/her default calendar if not yet present
	if (!$existing && ($calendar = $this->get_default_calendar($invitation['event']['sensitivity']))) {
	$invitation['event']['calendar'] = $calendar['id'];
	if ($this->driver->new_event($invitation['event'])) {
	$msg = $this->gettext(['name' => 'importedsuccessfully', 'vars' => ['calendar' => $calendar['name']]]);
	$this->rc->output->command('display_message', $msg, 'confirmation');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('errorimportingevent'), 'error');
	}
	}
	else if ($existing
	&& ($this->event['sequence'] >= $existing['sequence']
	\|\| $this->event['changed'] >= $existing['changed'])
	&& ($calendar = $this->driver->get_calendar($existing['calendar']))
	) {
	$this->event = $invitation['event'];
	$this->event['id'] = $existing['id'];

	unset($this->event['comment']);

	// merge attendees status
	// e.g. preserve my participant status for regular updates
	$this->lib->merge_attendees($this->event, $existing, $status);

	// update attachments list
	$event['deleted_attachments'] = true;

	// show me as free when declined (#1670)
	if ($status == 'declined') {
	$this->event['free_busy'] = 'free';
	}

	if ($this->driver->edit_event($this->event)) {
	$msg = $this->gettext(['name' => 'updatedsuccessfully', 'vars' => ['calendar' => $calendar->get_name()]]);
	$this->rc->output->command('display_message', $msg, 'confirmation');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('errorimportingevent'), 'error');
	}
	}
	}
	}

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

	if (empty($this->invitestatus)) {
	$this->itip->set_rsvp_actions(['accepted', 'tentative', 'declined']);
	$this->register_handler('plugin.event_rsvp_buttons', [$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(['name' => "_t", 'value' => $this->token]);

	return html::tag('form', [
	'action' => $this->rc->url(['task' => 'calendar', 'action' => 'attend']),
	'method' => 'post',
	'noclose' => true
	] + $attrib
	) . $hidden->show();
	}

	/**
	*
	*/
	private function mail_agenda_event_row($event, $class = '')
	{
	if (!empty($event['allday'])) {
	$time = $this->gettext('all-day');
	}
	else {
	$start = is_object($event['start']) ? clone $event['start'] : $event['start'];
	$end = is_object($event['end']) ? clone $event['end'] : $event['end'];

	$time = $this->rc->format_date($start, $this->rc->config->get('time_format'))
	. ' - ' . $this->rc->format_date($end, $this->rc->config->get('time_format'));
	}

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

	/**
	*
	*/
	public function mail_messages_list($p)
	{
	if (!empty($p['cols']) && 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, ['multipart/alternative', 'multipart/mixed'])) {
	// TODO: fetch bodystructure and search for ical parts. Maybe too expensive?
	if (!empty($header->structure) && !empty($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 = '';
	$date_str = $this->rc->format_date(clone $event['start'], $this->rc->config->get('date_format'), empty($event['start']->_dateonly));
	$date = new DateTime($event['start']->format('Y-m-d') . ' 12:00:00', new DateTimeZone('UTC'));

	// 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', $date_str))
	. '%before%' . $this->mail_agenda_event_row($event, 'current') . '%after%'
	);
	}

	$html .= html::div('calendar-invitebox invitebox boxinformation',
	$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(['task' => 'calendar']) . '&view=agendaDay&date=' . $date->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([
	'id' => 'attachmentsavecal',
	'name' => 'attachmentsavecal',
	'type' => 'link',
	'wrapper' => 'li',
	'command' => 'attachment-save-calendar',
	'class' => 'icon calendarlink disabled',
	'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;
	$instance = rcube_utils::get_input_value('_instance', rcube_utils::INPUT_POST);
	$savemode = rcube_utils::get_input_value('_savemode', rcube_utils::INPUT_POST);
	$comment = rcube_utils::get_input_value('_comment', rcube_utils::INPUT_POST);

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

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

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

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

	$event['comment'] = $comment;

	if ($itip->delegate_to($event, $delegate, !empty($rsvpme))) {
	$this->rc->output->show_message('calendar.itipsendsuccess', 'confirmation');
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('itipresponseerror'), 'error');
	}

	unset($event['comment']);

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

	$mode = calendar_driver::FILTER_PERSONAL
	\| calendar_driver::FILTER_SHARED
	\| calendar_driver::FILTER_WRITEABLE;

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

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

	$metadata = [
	'uid' => $event['uid'],
	'_instance' => isset($event['_instance']) ? $event['_instance'] : null,
	'changed' => is_object($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 = $attendee;
	}
	else if (!empty($attendee['email']) && in_array(strtolower($attendee['email']), $emails)) {
	$event['attendees'][$i]['status'] = strtoupper($status);
	if (!in_array($event['attendees'][$i]['status'], ['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'][] = [
	'name' => $sender_identity['name'],
	'email' => $sender_identity['email'],
	'role' => 'OPT-PARTICIPANT',
	'status' => strtoupper($status),
	];
	$metadata['attendee'] = $sender_identity['email'];
	}
	}

	// save to calendar
	if ($calendar && !empty($calendar['editable'])) {
	// check for existing event with the same UID
	$existing = $this->find_event($event, $mode);

	// we'll create a new copy if user decided to change the calendar
	if ($existing && $cal_id && $calendar && $calendar['id'] != $existing['calendar']) {
	$existing = null;
	}

	if ($existing) {
	$calendar = $calendars[$existing['calendar']];

	// forward savemode for correct updates of recurring events
	$existing['_savemode'] = $savemode ?: (!empty($event['_savemode']) ? $event['_savemode'] : null);

	// only update attendee status
	if ($event['_method'] == 'REPLY') {
	$existing_attendee_index = -1;

	$event_attendee = null;
	$update_attendees = [];

	if ($attendee = $this->itip->find_reply_attendee($event)) {
	$event_attendee = $attendee;
	$update_attendees[] = $attendee;
	$metadata['fallback'] = $attendee['status'];
	$metadata['attendee'] = $attendee['email'];
	$metadata['rsvp'] = !empty($attendee['rsvp']) \|\| $attendee['role'] != 'NON-PARTICIPANT';

	$existing_attendee_emails = [];

	// Find the attendee to update
	foreach ($existing['attendees'] as $i => $existing_attendee) {
	$existing_attendee_emails[] = $existing_attendee['email'];
	if ($this->itip->compare_email($existing_attendee['email'], $attendee['email'])) {
	$existing_attendee_index = $i;
	}
	}

	if ($attendee['status'] == 'DELEGATED') {
	//Also find and copy the delegatee
	$delegatee_email = $attendee['email'];
	$delegatees = array_filter($event['attendees'], function($attendee) use ($delegatee_email){ return $attendee['role'] != 'ORGANIZER' && $this->itip->compare_email($attendee['delegated-from'], $delegatee_email); });

	if ($delegatee = $this->itip->find_attendee_by_email($event['attendees'], 'delegated-from', $attendee['email'])) {
	$update_attendees[] = $delegatee;
	if (!in_array_nocase($delegatee['email'], $existing_attendee_emails)) {
	$existing['attendees'][] = $delegated_attendee;
	}
	}
	}
	}

	// if delegatee has declined, set delegator's RSVP=True
	if ($event_attendee
	&& $event_attendee['status'] == 'DECLINED'
	&& !empty($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_index >= 0 && $event_attendee) {
	$existing['attendees'][$existing_attendee_index] = $event_attendee;
	$success = $this->driver->update_attendees($existing, $update_attendees);
	}
	// update the entire attendees block
	else if (
	($event['sequence'] >= $existing['sequence'] \|\| $event['changed'] >= $existing['changed'])
	&& $event_attendee
	) {
	$existing['attendees'][] = $event_attendee;
	$success = $this->driver->update_attendees($existing, $update_attendees);
	}
	else if (!$event_attendee) {
	$error_msg = $this->gettext('errorunknownattendee');
	}
	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'];

	// merge attendees status
	// e.g. preserve my participant status for regular updates
	$this->lib->merge_attendees($event, $existing, $status);

	// set status=CANCELLED on CANCEL messages
	if ($event['_method'] == 'CANCEL') {
	$event['status'] = 'CANCELLED';
	}

	// update attachments list, allow attachments update only on REQUEST (#5342)
	if ($event['_method'] == 'REQUEST') {
	$event['deleted_attachments'] = true;
	}
	else {
	unset($event['attachments']);
	}

	// show me as free when declined (#1670)
	if ($status == 'declined'
	\|\| (!empty($event['status']) && $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';
	}

	// if the RSVP reply only refers to a single instance:
	// store unmodified master event with current instance as exception
	if (!empty($instance) && !empty($savemode) && $savemode != 'all') {
	$master = $this->lib->mail_get_itip_object($mbox, $uid, $mime_id, 'event');
	if ($master['recurrence'] && empty($master['_instance'])) {
	// compute recurring events until this instance's date
	if ($recurrence_date = rcube_utils::anytodatetime($instance, $master['start']->getTimezone())) {
	$recurrence_date->setTime(23,59,59);

	foreach ($this->driver->get_recurring_events($master, $master['start'], $recurrence_date) as $recurring) {
	if ($recurring['_instance'] == $instance) {
	// copy attendees block with my partstat to exception
	$recurring['attendees'] = $event['attendees'];
	$master['recurrence']['EXCEPTIONS'][] = $recurring;
	$event = $recurring; // set reference for iTip reply
	break;
	}
	}

	$master['calendar'] = $event['calendar'] = $calendar['id'];
	$success = $this->driver->new_event($master);
	}
	else {
	$master = null;
	}
	}
	else {
	$master = null;
	}
	}

	// save to the selected/default calendar
	if (!$master) {
	$event['calendar'] = $calendar['id'];
	$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 ($success) {
	if ($event['_method'] == 'REPLY') {
	$message = 'attendeupdateesuccess';
	}
	else {
	$message = $deleted ? 'successremoval' : ($existing ? 'updatedsuccessfully' : 'importedsuccessfully');
	}

	$msg = $this->gettext(['name' => $message, 'vars' => ['calendar' => $calendar['name']]]);
	$this->rc->output->command('display_message', $msg, 'confirmation');
	}

	if ($success \|\| $dontsave) {
	$metadata['calendar'] = isset($event['calendar']) ? $event['calendar'] : null;
	$metadata['nosave'] = $dontsave;
	$metadata['rsvp'] = !empty($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 ($event['_method'] == 'REQUEST' && !empty($organizer) && !$noreply
	&& !in_array(strtolower($organizer['email']), $emails) && !$error_msg
	) {
	$event['comment'] = $comment;
	$itip = $this->load_itip();
	$itip->set_sender_email($reply_sender);

	if ($itip->send_itip_message($event, 'REPLY', $organizer, 'itipsubject' . $status, 'itipmailbody' . $status)) {
	$mailto = $organizer['name'] ? $organizer['name'] : $organizer['email'];
	$msg = $this->gettext(['name' => 'sentresponseto', 'vars' => ['mailto' => $mailto]]);
	$this->rc->output->command('display_message', $msg, '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')) {
	$mailto = !empty($attendee['name']) ? $attendee['name'] : $attendee['email'];
	$msg = $this->gettext(['name' => 'sentresponseto', 'vars' => ['mailto' => $mailto]]);
	$this->rc->output->command('display_message', $msg, '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 = RCUBE_CHARSET;

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

	if ($uid && $mime_id) {
	$part = $imap->get_message_part($uid, $mime_id);
	// $headers = $imap->get_message_headers($uid);

	if ($part) {
	if (!empty($part->ctype_parameters['charset'])) {
	$charset = $part->ctype_parameters['charset'];
	}
	$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(calendar_driver::FILTER_PERSONAL);

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

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

	if ($success) {
	$msg = $this->gettext(['name' => 'importsuccess', 'vars' => ['nr' => $success]]);
	$this->rc->output->command('display_message', $msg, 'confirmation');
	}
	else if ($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()
	{
	$this->ui->init();
	$this->ui->addJS();
	$this->ui->init_templates();
	$this->ui->calendar_list([], true); // set env['calendars']

	$uid = rcube_utils::get_input_value('_uid', rcube_utils::INPUT_GET);
	$mbox = rcube_utils::get_input_value('_mbox', rcube_utils::INPUT_GET);
	$event = [];

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

	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)) {
	$event['links'] = [$msgref];
	}
	// copy mail attachments to event
	else if ($message->attachments) {
	$eventid = 'cal-';
	if (empty($_SESSION[self::SESSION_KEY]) \|\| $_SESSION[self::SESSION_KEY]['id'] != $eventid) {
	$_SESSION[self::SESSION_KEY] = [
	'id' => $eventid,
	'attachments' => [],
	];
	}

	foreach ((array) $message->attachments as $part) {
	$attachment = [
	'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 (!empty($attachment['status']) && !$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->set_env('event_prop', $event);
	}
	else {
	$this->rc->output->command('display_message', $this->gettext('messageopenerror'), 'error');
	}

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

	/**
	* 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(['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');
	$export = $this->get_ical()->export([$event], '', false, [$this->driver, 'get_attachment_body']);

	file_put_contents($tmp_path, $export);

	$args['attachments'][] = [
	'path' => $tmp_path,
	'name' => $filename . '.ics',
	'mimetype' => 'text/calendar',
	'size' => filesize($tmp_path),
	];
	$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 = [])
	{
	$param += ['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)
	{
	// delete itipinvitations entries related to this user
	$db = $this->rc->get_dbh();
	$table_itipinvitations = $db->table_name('itipinvitations', true);

	$db->query("DELETE FROM $table_itipinvitations WHERE `user_id` = ?", $args['user']->ID);

	$this->setup();
	$this->load_driver();

	return $this->driver->user_delete($args);
	}

	/**
	* Find first occurrence of a recurring event excluding start date
	*
	* @param array $event Event data (with 'start' and 'recurrence')
	*
	* @return DateTime Date of the first occurrence
	*/
	public function find_first_occurrence($event)
	{
	// Make sure libkolab plugin is loaded in case of Kolab driver
	$this->load_driver();

	// Use libkolab to compute recurring events (and libkolab plugin)
	// Horde-based fallback has many bugs
	if (class_exists('kolabformat') && class_exists('kolabcalendaring') && class_exists('kolab_date_recurrence')) {
	$object = kolab_format::factory('event', 3.0);
	$object->set($event);

	$recurrence = new kolab_date_recurrence($object);
	}
	else {
	// fallback to libcalendaring (Horde-based) recurrence implementation
	require_once(__DIR__ . '/lib/calendar_recurrence.php');
	$recurrence = new calendar_recurrence($this, $event);
	}

	return $recurrence->first_occurrence();
	}

	/**
	* Get date-time input from UI and convert to unix timestamp
	*/
	protected function input_timestamp($name, $type)
	{
	$ts = rcube_utils::get_input_value($name, $type);

	if ($ts && (!is_numeric($ts) \|\| strpos($ts, 'T'))) {
	$ts = new DateTime($ts, $this->timezone);
	$ts = $ts->getTimestamp();
	}

	return $ts;
	}

	/**
	* 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;
	}
	}

File Metadata

Mime Type: text/x-php
Expires: Sat, Nov 23, 7:39 AM (1 d, 21 h)
Storage Engine: blob
Storage Format: Raw Data
Storage Handle: 80118
Default Alt Text: calendar.php (161 KB)

calendar.phpNo OneTemporaryActions

calendar.phpView Options

File Metadata

Event Timeline

calendar.php
No OneTemporary
Actions

calendar.php
View Options