kolab_calendar.php
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kolab_calendar.php
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	<?php

	/**
	* Kolab calendar storage class
	*
	* @version 0.6-beta
	* @author Thomas Bruederli <roundcube@gmail.com>
	* @author Aleksander Machniak <machniak@kolabsys.com>
	*
	* Copyright (C) 2011, Kolab Systems AG
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2
	* as published by the Free Software Foundation.
	*
	* 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 General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/


	class kolab_calendar
	{
	public $id;
	public $ready = false;
	public $readonly = true;
	public $attachments = true;
	public $alarms = false;
	public $categories = array();

	private $cal;
	private $storage;
	private $events;
	private $id2uid;
	private $imap_folder = 'INBOX/Calendar';
	private $namespace;
	private $search_fields = array('title', 'description', 'location', '_attendees');
	private $sensitivity_map = array('public', 'private', 'confidential');
	private $priority_map = array('low', 'normal', 'high');
	private $role_map = array('REQ-PARTICIPANT' => 'required', 'OPT-PARTICIPANT' => 'optional', 'CHAIR' => 'resource');
	private $status_map = array('NEEDS-ACTION' => 'none', 'TENTATIVE' => 'tentative', 'CONFIRMED' => 'accepted', 'ACCEPTED' => 'accepted', 'DECLINED' => 'declined');
	private $month_map = array('', 'january', 'february', 'march', 'april', 'may', 'june', 'july', 'august', 'september', 'october', 'november', 'december');
	private $weekday_map = array('MO'=>'monday', 'TU'=>'tuesday', 'WE'=>'wednesday', 'TH'=>'thursday', 'FR'=>'friday', 'SA'=>'saturday', 'SU'=>'sunday');


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

	if (strlen($imap_folder))
	$this->imap_folder = $imap_folder;

	// ID is derrived from folder name
	$this->id = rcube_kolab::folder_id($this->imap_folder);

	// fetch objects from the given IMAP folder
	$this->storage = rcube_kolab::get_storage($this->imap_folder);

	$this->ready = !PEAR::isError($this->storage);

	// Set readonly and alarms flags according to folder permissions
	if ($this->ready) {
	if ($this->get_owner() == $_SESSION['username']) {
	$this->readonly = false;
	$this->alarms = true;
	}
	else {
	$rights = $this->storage->_folder->getMyRights();
	if (!PEAR::isError($rights)) {
	if (strpos($rights, 'i') !== false)
	$this->readonly = false;
	}
	}

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


	/**
	* Getter for a nice and human readable name for this calendar
	* See http://wiki.kolab.org/UI-Concepts/Folder-Listing for reference
	*
	* @return string Name of this calendar
	*/
	public function get_name()
	{
	$folder = rcube_kolab::object_name($this->imap_folder, $this->namespace);
	return $folder;
	}


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


	/**
	* Getter for the IMAP folder owner
	*
	* @return string Name of the folder owner
	*/
	public function get_owner()
	{
	return $this->storage->_folder->getOwner();
	}


	/**
	* Getter for the name of the namespace to which the IMAP folder belongs
	*
	* @return string Name of the namespace (personal, other, shared)
	*/
	public function get_namespace()
	{
	if ($this->namespace === null) {
	$this->namespace = rcube_kolab::folder_namespace($this->imap_folder);
	}
	return $this->namespace;
	}


	/**
	* Getter for the top-end calendar folder name (not the entire path)
	*
	* @return string Name of this calendar
	*/
	public function get_foldername()
	{
	$parts = explode('/', $this->imap_folder);
	return rcube_charset_convert(end($parts), 'UTF7-IMAP');
	}

	/**
	* Return color to display this calendar
	*/
	public function get_color()
	{
	// color is defined in folder METADATA
	// FIXME: Kolab_Folder::getKolabAttribute() only reads value.shared; value.priv should be considered first
	/* DISABLED until KEP #12 is approved
	if ($color = $this->storage->_folder->getKolabAttribute('color')) {
	return $color;
	}
	*/
	// calendar color is stored in user prefs (temporary solution)
	$prefs = $this->cal->rc->config->get('kolab_calendars', array());

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

	return 'cc0000';
	}

	/**
	* Return the corresponding Kolab_Folder instance
	*/
	public function get_folder()
	{
	return $this->storage->_folder;
	}

	/**
	* Getter for the attachment body
	*/
	public function get_attachment_body($id)
	{
	return $this->storage->getAttachment($id);
	}


	/**
	* Getter for a single event object
	*/
	public function get_event($id)
	{
	$this->_fetch_events();

	// event not found, maybe a recurring instance is requested
	if (!$this->events[$id]) {
	$master_id = preg_replace('/-\d+$/', '', $id);
	if ($this->events[$master_id] && $this->events[$master_id]['recurrence']) {
	$master = $this->events[$master_id];
	$this->_get_recurring_events($master, $master['start'], $master['start'] + 86400 * 365 * 10, $id);
	}
	}

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


	/**
	* @param integer Event's new start (unix timestamp)
	* @param integer Event's new end (unix timestamp)
	* @param string Search query (optional)
	* @param boolean Strip virtual events (optional)
	* @return array A list of event records
	*/
	public function list_events($start, $end, $search = null, $virtual = 1)
	{
	$this->_fetch_events();

	if (!empty($search))
	$search = mb_strtolower($search);

	$events = array();
	foreach ($this->events as $id => $event) {
	// remember seen categories
	if ($event['categories'])
	$this->categories[$event['categories']]++;

	// filter events by search query
	if (!empty($search)) {
	$hit = false;
	foreach ($this->search_fields as $col) {
	$sval = is_array($col) ? $event[$col[0]][$col[1]] : $event[$col];
	if (empty($sval))
	continue;

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

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

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

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

	return $events;
	}


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

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

	if (PEAR::isError($saved)) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving event object to Kolab server:" . $saved->getMessage()),
	true, false);
	$saved = false;
	}
	else {
	$event['id'] = $event['uid'];
	$this->events[$event['uid']] = $event;
	}

	return $saved;
	}

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

	public function update_event($event)
	{
	$updated = false;
	$old = $this->storage->getObject($event['id']);
	$old['recurrence'] = ''; # clear old field, could have been removed in new, too
	$object = array_merge($old, $this->_from_rcube_event($event));
	$saved = $this->storage->save($object, $event['id']);

	if (PEAR::isError($saved)) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error saving event object to Kolab server:" . $saved->getMessage()),
	true, false);
	}
	else {
	$updated = true;
	$this->events[$event['id']] = $this->_to_rcube_event($object);
	}

	return $updated;
	}

	/**
	* Delete an event record
	*
	* @see calendar_driver::remove_event()
	* @return boolean True on success, False on error
	*/
	public function delete_event($event, $force = true)
	{
	$deleted = false;

	if (!$force) {
	// Get IMAP object ID
	$imap_uid = $this->storage->_getStorageId($event['id']);
	}

	$deleteme = $this->storage->delete($event['id'], $force);

	if (PEAR::isError($deleteme)) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error deleting event object from Kolab server:" . $deleteme->getMessage()),
	true, false);
	}
	else {
	// Save IMAP object ID in session, will be used for restore action
	if ($imap_uid)
	$_SESSION['kolab_delete_uids'][$event['id']] = $imap_uid;

	$deleted = true;
	}

	return $deleted;
	}

	/**
	* Restore deleted event record
	*
	* @see calendar_driver::undelete_event()
	* @return boolean True on success, False on error
	*/
	public function restore_event($event)
	{
	$imap_uid = $_SESSION['kolab_delete_uids'][$event['id']];

	if (!$imap_uid)
	return false;

	$session = &Horde_Kolab_Session::singleton();
	$imap = &$session->getImap();

	if (is_object($imap) && is_a($imap, 'PEAR_Error')) {
	$error = $imap;
	}
	else {
	$result = $imap->select($this->imap_folder);
	if (is_object($result) && is_a($result, 'PEAR_Error')) {
	$error = $result;
	}
	else {
	$result = $imap->undeleteMessages($imap_uid);
	if (is_object($result) && is_a($result, 'PEAR_Error')) {
	$error = $result;
	}
	else {
	// re-sync the cache
	$this->storage->synchronize();
	}
	}
	}

	if ($error) {
	raise_error(array(
	'code' => 600, 'type' => 'php',
	'file' => __FILE__, 'line' => __LINE__,
	'message' => "Error undeleting an event object(s) from the Kolab server:" . $error->getMessage()),
	true, false);

	return false;
	}

	$rcmail = rcmail::get_instance();
	$rcmail->session->remove('kolab_delete_uids');

	return true;
	}

	/**
	* Simply fetch all records and store them in private member vars
	* We thereby rely on cahcing done by the Horde classes
	*/
	private function _fetch_events()
	{
	if (!isset($this->events)) {
	$this->events = array();
	foreach ((array)$this->storage->getObjects() as $record) {
	$event = $this->_to_rcube_event($record);
	$this->events[$event['id']] = $event;
	}
	}
	}


	/**
	* Create instances of a recurring event
	*/
	private function _get_recurring_events($event, $start, $end, $event_id = null)
	{
	// use Horde classes to compute recurring instances
	require_once($this->cal->home . '/lib/Horde_Date_Recurrence.php');

	$recurrence = new Horde_Date_Recurrence($event['start']);
	$recurrence->fromRRule20(calendar::to_rrule($event['recurrence']));

	foreach ((array)$event['recurrence']['EXDATE'] as $exdate)
	$recurrence->addException(date('Y', $exdate), date('n', $exdate), date('j', $exdate));

	$events = array();
	$duration = $event['end'] - $event['start'];
	$next = new Horde_Date($event['start']);
	$i = 0;
	while ($next = $recurrence->nextActiveRecurrence(array('year' => $next->year, 'month' => $next->month, 'mday' => $next->mday + 1, 'hour' => $next->hour, 'min' => $next->min, 'sec' => $next->sec))) {
	$rec_start = $next->timestamp();
	$rec_end = $rec_start + $duration;
	$rec_id = $event['id'] . '-' . ++$i;

	// add to output if in range
	if (($rec_start <= $end && $rec_end >= $start) \|\| ($event_id && $rec_id == $event_id)) {
	$rec_event = $event;
	$rec_event['id'] = $rec_id;
	$rec_event['recurrence_id'] = $event['id'];
	$rec_event['start'] = $rec_start;
	$rec_event['end'] = $rec_end;
	$rec_event['_instance'] = $i;
	$events[] = $rec_event;

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

	return $events;
	}

	/**
	* Convert from Kolab_Format to internal representation
	*/
	private function _to_rcube_event($rec)
	{
	$start_time = date('H:i:s', $rec['start-date']);
	$allday = $start_time == '00:00:00' && $start_time == date('H:i:s', $rec['end-date']);
	if ($allday) { // in Roundcube all-day events only go until 23:59:59 of the last day
	$rec['end-date']--;
	$rec['end-date'] -= $this->cal->timezone * 3600 - date('Z', $rec['end-date']); // shift 00 times from server's timezone to user's timezone
	$rec['start-date'] -= $this->cal->timezone * 3600 - date('Z', $rec['start-date']); // because generated with mktime() in Horde_Kolab_Format_Date::decodeDate()
	// sanity check
	if ($rec['end-date'] <= $rec['start-date'])
	$rec['end-date'] += 86400;
	}

	// convert alarm time into internal format
	if ($rec['alarm']) {
	$alarm_value = $rec['alarm'];
	$alarm_unit = 'M';
	if ($rec['alarm'] % 1440 == 0) {
	$alarm_value /= 1440;
	$alarm_unit = 'D';
	}
	else if ($rec['alarm'] % 60 == 0) {
	$alarm_value /= 60;
	$alarm_unit = 'H';
	}
	$alarm_value *= -1;
	}

	// convert recurrence rules into internal pseudo-vcalendar format
	if ($recurrence = $rec['recurrence']) {
	$rrule = array(
	'FREQ' => strtoupper($recurrence['cycle']),
	'INTERVAL' => intval($recurrence['interval']),
	);

	if ($recurrence['range-type'] == 'number')
	$rrule['COUNT'] = intval($recurrence['range']);
	else if ($recurrence['range-type'] == 'date')
	$rrule['UNTIL'] = $recurrence['range'];

	if ($recurrence['day']) {
	$byday = array();
	$prefix = ($rrule['FREQ'] == 'MONTHLY' \|\| $rrule['FREQ'] == 'YEARLY') ? intval($recurrence['daynumber'] ? $recurrence['daynumber'] : 1) : '';
	foreach ($recurrence['day'] as $day)
	$byday[] = $prefix . substr(strtoupper($day), 0, 2);
	$rrule['BYDAY'] = join(',', $byday);
	}
	if ($recurrence['daynumber']) {
	if ($recurrence['type'] == 'monthday' \|\| $recurrence['type'] == 'daynumber')
	$rrule['BYMONTHDAY'] = $recurrence['daynumber'];
	else if ($recurrence['type'] == 'yearday')
	$rrule['BYYEARDAY'] = $recurrence['daynumber'];
	}
	if ($recurrence['month']) {
	$monthmap = array_flip($this->month_map);
	$rrule['BYMONTH'] = strtolower($monthmap[$recurrence['month']]);
	}

	if ($recurrence['exclusion']) {
	foreach ((array)$recurrence['exclusion'] as $excl)
	$rrule['EXDATE'][] = strtotime($excl . date(' H:i:s', $rec['start-date'])); // use time of event start
	}
	}

	$sensitivity_map = array_flip($this->sensitivity_map);
	$priority_map = array_flip($this->priority_map);
	$status_map = array_flip($this->status_map);
	$role_map = array_flip($this->role_map);

	if (!empty($rec['_attachments'])) {
	foreach ($rec['_attachments'] as $name => $attachment) {
	// @TODO: 'type' and 'key' are the only supported (no 'size')
	$attachments[] = array(
	'id' => $attachment['key'],
	'mimetype' => $attachment['type'],
	'name' => $name,
	);
	}
	}

	if ($rec['organizer']) {
	$attendees[] = array(
	'role' => 'ORGANIZER',
	'name' => $rec['organizer']['display-name'],
	'email' => $rec['organizer']['smtp-address'],
	'status' => 'ACCEPTED',
	);
	$_attendees .= $rec['organizer']['display-name'] . ' ' . $rec['organizer']['smtp-address'] . ' ';
	}

	foreach ((array)$rec['attendee'] as $attendee) {
	$attendees[] = array(
	'role' => $role_map[$attendee['role']],
	'name' => $attendee['display-name'],
	'email' => $attendee['smtp-address'],
	'status' => $status_map[$attendee['status']],
	'rsvp' => $attendee['request-response'],
	);
	$_attendees .= $rec['organizer']['display-name'] . ' ' . $rec['organizer']['smtp-address'] . ' ';
	}

	// Roundcube only supports one category assignment
	$categories = explode(',', $rec['categories']);

	return array(
	'id' => $rec['uid'],
	'uid' => $rec['uid'],
	'title' => $rec['summary'],
	'location' => $rec['location'],
	'description' => $rec['body'],
	'start' => $rec['start-date'],
	'end' => $rec['end-date'],
	'allday' => $allday,
	'recurrence' => $rrule,
	'alarms' => $alarm_value . $alarm_unit,
	'_alarm' => intval($rec['alarm']),
	'categories' => $categories[0],
	'attachments' => $attachments,
	'attendees' => $attendees,
	'_attendees' => $_attendees,
	'free_busy' => $rec['show-time-as'],
	'priority' => isset($priority_map[$rec['priority']]) ? $priority_map[$rec['priority']] : 1,
	'sensitivity' => $sensitivity_map[$rec['sensitivity']],
	'changed' => $rec['last-modification-date'],
	'calendar' => $this->id,
	);
	}

	/**
	* Convert the given event record into a data structure that can be passed to Kolab_Storage backend for saving
	* (opposite of self::_to_rcube_event())
	*/
	private function _from_rcube_event($event)
	{
	$priority_map = $this->priority_map;
	$tz_offset = $this->cal->timezone * 3600;

	$object = array(
	// kolab => roundcube
	'uid' => $event['uid'],
	'summary' => $event['title'],
	'location' => $event['location'],
	'body' => $event['description'],
	'categories' => $event['categories'],
	'start-date' => $event['start'],
	'end-date' => $event['end'],
	'sensitivity' =>$this->sensitivity_map[$event['sensitivity']],
	'show-time-as' => $event['free_busy'],
	'priority' => isset($priority_map[$event['priority']]) ? $priority_map[$event['priority']] : 1,
	);

	//handle alarms
	if ($event['alarms']) {
	//get the value
	$alarmbase = explode(":", $event['alarms']);

	//get number only
	$avalue = preg_replace('/[^0-9]/', '', $alarmbase[0]);

	if (preg_match("/H/",$alarmbase[0])) {
	$object['alarm'] = $avalue*60;
	} else if (preg_match("/D/",$alarmbase[0])) {
	$object['alarm'] = $avalue2460;
	} else {
	$object['alarm'] = $avalue;
	}
	}

	//recurr object/array
	if (count($event['recurrence']) > 1) {
	$ra = $event['recurrence'];

	//Frequency abd interval
	$object['recurrence']['cycle'] = strtolower($ra['FREQ']);
	$object['recurrence']['interval'] = intval($ra['INTERVAL']);

	//Range Type
	if ($ra['UNTIL']) {
	$object['recurrence']['range-type'] = 'date';
	$object['recurrence']['range'] = $ra['UNTIL'];
	}
	if ($ra['COUNT']) {
	$object['recurrence']['range-type'] = 'number';
	$object['recurrence']['range'] = $ra['COUNT'];
	}

	//weekly
	if ($ra['FREQ'] == 'WEEKLY') {
	if ($ra['BYDAY']) {
	foreach (split(",", $ra['BYDAY']) as $day)
	$object['recurrence']['day'][] = $this->weekday_map[$day];
	}
	else {
	// use weekday of start date if empty
	$object['recurrence']['day'][] = strtolower(gmdate('l', $event['start'] + $tz_offset));
	}
	}

	//monthly (temporary hack to follow current Horde logic)
	if ($ra['FREQ'] == 'MONTHLY') {
	if ($ra['BYDAY'] && preg_match('/(-?[1-4])([A-Z]+)/', $ra['BYDAY'], $m)) {
	$object['recurrence']['daynumber'] = $m[1];
	$object['recurrence']['day'] = array($this->weekday_map[$m[2]]);
	$object['recurrence']['cycle'] = 'monthly';
	$object['recurrence']['type'] = 'weekday';
	}
	else {
	$object['recurrence']['daynumber'] = date('j', $event['start']);
	$object['recurrence']['cycle'] = 'monthly';
	$object['recurrence']['type'] = 'daynumber';
	}
	}

	//yearly
	if ($ra['FREQ'] == 'YEARLY') {
	if (!$ra['BYMONTH'])
	$ra['BYMONTH'] = gmdate('n', $event['start'] + $tz_offset);

	$object['recurrence']['cycle'] = 'yearly';
	$object['recurrence']['month'] = $this->month_map[intval($ra['BYMONTH'])];

	if ($ra['BYDAY'] && preg_match('/(-?[1-4])([A-Z]+)/', $ra['BYDAY'], $m)) {
	$object['recurrence']['type'] = 'weekday';
	$object['recurrence']['daynumber'] = $m[1];
	$object['recurrence']['day'] = array($this->weekday_map[$m[2]]);
	}
	else {
	$object['recurrence']['type'] = 'monthday';
	$object['recurrence']['daynumber'] = gmdate('j', $event['start'] + $tz_offset);
	}
	}

	//exclusions
	foreach ((array)$ra['EXDATE'] as $excl) {
	$object['recurrence']['exclusion'][] = gmdate('Y-m-d', $excl + $tz_offset);
	}
	}

	// whole day event
	if ($event['allday']) {
	$object['end-date'] += 60; // end is at 23:59 => jump to the next day
	$object['end-date'] += $tz_offset - date('Z'); // shift 00 times from user's timezone to server's timezone
	$object['start-date'] += $tz_offset - date('Z'); // because Horde_Kolab_Format_Date::encodeDate() uses strftime()

	// sanity check: end date is same or smaller than start
	if (date('Y-m-d', $object['end-date']) <= date('Y-m-d', $object['start-date']))
	$object['end-date'] = mktime(0,0,0, date('n', $object['start-date']), date('j', $object['start-date']), date('Y', $object['start-date'])) + 86400;

	$object['_is_all_day'] = 1;
	}

	// in Horde attachments are indexed by name
	$object['_attachments'] = array();
	if (!empty($event['attachments'])) {
	$collisions = array();
	foreach ($event['attachments'] as $idx => $attachment) {
	// Roundcube ID has nothing to do with Horde ID, remove it
	if ($attachment['content'])
	unset($attachment['id']);

	// Horde code assumes that there will be no more than
	// one file with the same name: make filenames unique
	$filename = $attachment['name'];
	if ($collisions[$filename]++) {
	$ext = preg_match('/(\.[a-z0-9]{1,6})$/i', $filename, $m) ? $m[1] : null;
	$attachment['name'] = basename($filename, $ext) . '-' . $collisions[$filename] . $ext;
	}

	// set type parameter
	if ($attachment['mimetype'])
	$attachment['type'] = $attachment['mimetype'];

	$object['_attachments'][$attachment['name']] = $attachment;
	unset($event['attachments'][$idx]);
	}
	}

	// process event attendees
	foreach ((array)$event['attendees'] as $attendee) {
	$role = $attendee['role'];
	if ($role == 'ORGANIZER') {
	$object['organizer'] = array(
	'display-name' => $attendee['name'],
	'smtp-address' => $attendee['email'],
	);
	}
	else {
	$object['attendee'][] = array(
	'display-name' => $attendee['name'],
	'smtp-address' => $attendee['email'],
	'status' => $this->status_map[$attendee['status']],
	'role' => $this->role_map[$role],
	'request-response' => $attendee['rsvp'],
	);
	}
	}

	return $object;
	}


	}

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