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egroupware/calendar/inc/class.calendar_groupdav.inc.php

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<?php
/**
* eGroupWare: GroupDAV access: calendar handler
*
* @link http://www.egroupware.org
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package calendar
* @subpackage groupdav
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright (c) 2007-9 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @version $Id$
*/
/**
* eGroupWare: GroupDAV access: calendar handler
*/
class calendar_groupdav extends groupdav_handler
{
/**
* bo class of the application
*
* @var calendar_boupdate
*/
var $bo;
var $filter_prop2cal = array(
'SUMMARY' => 'cal_title',
'UID' => 'cal_uid',
'DTSTART' => 'cal_start',
'DTEND' => 'cal_end',
// 'DURATION'
//'RRULE' => 'recur_type',
//'RDATE' => 'cal_start',
//'EXRULE'
//'EXDATE'
//'RECURRENCE-ID'
);
/**
* Does client understand exceptions to be included in VCALENDAR component of series master sharing its UID
*
* That also means no EXDATE for these exceptions!
*
* Setting it to false, should give the old behavior used in 1.6 (hopefully) no client needs that.
*
* @var boolean
*/
var $client_shared_uid_exceptions = true;
/**
* Are we using id or uid for the path/url
*/
const PATH_ATTRIBUTE = 'id';
/**
* Constructor
*
* @param string $app 'calendar', 'addressbook' or 'infolog'
* @param int $debug=null debug-level to set
* @param string $base_uri=null base url of handler
*/
function __construct($app,$debug=null, $base_uri=null)
{
parent::__construct($app,$debug,$base_uri);
$this->bo = new calendar_boupdate();
}
/**
* Create the path for an event
*
* @param array|int $event
* @return string
*/
static function get_path($event)
{
if (is_numeric($event) && self::PATH_ATTRIBUTE == 'id')
{
$name = $event;
}
else
{
if (!is_array($event)) $event = $this->bo->read($event);
$name = $event[self::PATH_ATTRIBUTE];
}
return '/calendar/'.$name.'.ics';
}
/**
* Handle propfind in the calendar folder
*
* @param string $path
* @param array $options
* @param array &$files
* @param int $user account_id
* @param string $id=''
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
*/
function propfind($path,$options,&$files,$user,$id='')
{
if ($this->debug) error_log(__METHOD__."($path,".array2string($options).",,$user,$id)");
$starttime = microtime(true);
// ToDo: add parameter to only return id & etag
$cal_filters = array(
'users' => $user,
'start' => time()-100*24*3600, // default one month back -30 breaks all sync recurrences
'end' => time()+365*24*3600, // default one year into the future +365
'enum_recuring' => false,
'daywise' => false,
'date_format' => 'server',
);
if ($this->client_shared_uid_exceptions)
{
$cal_filters['query']['cal_reference'] = 0;
}
// process REPORT filters or multiget href's
if (($id || $options['root']['name'] != 'propfind') && !$this->_report_filters($options,$cal_filters,$id))
{
return false;
}
if ($this->debug > 1) error_log(__METHOD__."($path,,,$user,$id) cal_filters=".array2string($cal_filters));
// check if we have to return the full calendar data or just the etag's
if (!($calendar_data = $options['props'] == 'all' && $options['root']['ns'] == groupdav::CALDAV) && is_array($options['props']))
{
foreach($options['props'] as $prop)
{
if ($prop['name'] == 'calendar-data')
{
$calendar_data = true;
break;
}
}
}
$events =& $this->bo->search($cal_filters);
if ($events)
{
// get all max user modified times at once
foreach($events as &$event)
{
$ids[] = $event['id'];
}
$max_user_modified = $this->bo->so->max_user_modified($ids);
foreach($events as &$event)
{
$event['max_user_modified'] = $max_user_modified[$event['id']];
//header('X-EGROUPWARE-EVENT-'.$event['id'].': '.$event['title'].': '.date('Y-m-d H:i:s',$event['start']).' - '.date('Y-m-d H:i:s',$event['end']));
$props = array(
HTTP_WebDAV_Server::mkprop('getetag',$this->get_etag($event)),
HTTP_WebDAV_Server::mkprop('getcontenttype', $this->agent != 'kde' ?
'text/calendar; charset=utf-8; component=VEVENT' : 'text/calendar'),
// getlastmodified and getcontentlength are required by WebDAV and Cadaver eg. reports 404 Not found if not set
HTTP_WebDAV_Server::mkprop('getlastmodified', $event['modified']),
HTTP_WebDAV_Server::mkprop('resourcetype',''), // iPhone requires that attribute!
);
//error_log(__FILE__ . __METHOD__ . "Calendar Data : $calendar_data");
if ($calendar_data)
{
$content = $this->iCal($event);
$props[] = HTTP_WebDAV_Server::mkprop('getcontentlength',bytes($content));
$props[] = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV,'calendar-data',$content);
}
else
{
$props[] = HTTP_WebDAV_Server::mkprop('getcontentlength', ''); // expensive to calculate and no CalDAV client uses it
}
$files['files'][] = array(
'path' => self::get_path($event),
'props' => $props,
);
}
}
if ($this->debug) error_log(__METHOD__."($path) took ".(microtime(true) - $starttime).' to return '.count($files['files']).' items');
return true;
}
/**
* Process the filters from the CalDAV REPORT request
*
* @param array $options
* @param array &$cal_filters
* @param string $id
* @return boolean true if filter could be processed, false for requesting not here supported VTODO items
*/
function _report_filters($options,&$cal_filters,$id)
{
if ($options['filters'])
{
// unset default start & end
$cal_start = $cal_filters['start']; unset($cal_filters['start']);
$cal_end = $cal_filters['end']; unset($cal_filters['end']);
$num_filters = count($cal_filters);
foreach($options['filters'] as $filter)
{
switch($filter['name'])
{
case 'comp-filter':
if ($this->debug > 1) error_log(__METHOD__."($options[path],...) comp-filter='{$filter['attrs']['name']}'");
switch($filter['attrs']['name'])
{
case 'VTODO':
return false; // return nothing for now, todo: check if we can pass it on to the infolog handler
// todos are handled by the infolog handler
//$infolog_handler = new groupdav_infolog();
//return $infolog_handler->propfind($path,$options,$files,$user,$method);
case 'VCALENDAR':
case 'VEVENT':
break; // that's our default anyway
}
break;
case 'prop-filter':
if ($this->debug > 1) error_log(__METHOD__."($options[path],...) prop-filter='{$filter['attrs']['name']}'");
$prop_filter = $filter['attrs']['name'];
break;
case 'text-match':
if ($this->debug > 1) error_log(__METHOD__."($options[path],...) text-match: $prop_filter='{$filter['data']}'");
if (!isset($this->filter_prop2cal[strtoupper($prop_filter)]))
{
if ($this->debug) error_log(__METHOD__."($options[path],".array2string($options).",...) unknown property '$prop_filter' --> ignored");
}
else
{
$cal_filters['query'][$this->filter_prop2cal[strtoupper($prop_filter)]] = $filter['data'];
}
unset($prop_filter);
break;
case 'param-filter':
if ($this->debug) error_log(__METHOD__."($options[path],...) param-filter='{$filter['attrs']['name']}' not (yet) implemented!");
break;
case 'time-range':
if ($this->debug > 1) error_log(__FILE__ . __METHOD__."($options[path],...) time-range={$filter['attrs']['start']}-{$filter['attrs']['end']}");
$cal_filters['start'] = $filter['attrs']['start'];
$cal_filters['end'] = $filter['attrs']['end'];
break;
default:
if ($this->debug) error_log(__METHOD__."($options[path],".array2string($options).",...) unknown filter --> ignored");
break;
}
}
if (count($cal_filters) == $num_filters) // no filters set --> restore default start and end time
{
$cal_filters['start'] = $cal_start;
$cal_filters['end'] = $cal_end;
}
}
// multiget or propfind on a given id
//error_log(__FILE__ . __METHOD__ . "multiget of propfind:");
if ($options['root']['name'] == 'calendar-multiget' || $id)
{
// no standard time-range!
unset($cal_filters['start']);
unset($cal_filters['end']);
$ids = array();
if ($id)
{
if (is_numeric($id))
{
$ids[] = (int)$id;
}
else
{
$cal_filters['query']['cal_uid'] = basename($id,'.ics');
}
}
else // fetch all given url's
{
foreach($options['other'] as $option)
{
if ($option['name'] == 'href')
{
$parts = explode('/',$option['data']);
if (is_numeric($id = basename(array_pop($parts),'.ics'))) $ids[] = $id;
}
}
}
if ($ids)
{
$cal_filters['query'][] = 'egw_cal.cal_id IN ('.implode(',',array_map(create_function('$n','return (int)$n;'),$ids)).')';
}
if ($this->debug > 1) error_log(__FILE__ . __METHOD__ ."($options[path],...,$id) calendar-multiget: ids=".implode(',',$ids));
}
return true;
}
/**
* Handle get request for an event
*
* @param array &$options
* @param int $id
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
*/
function get(&$options,$id)
{
if (!is_array($event = $this->_common_get_put_delete('GET',$options,$id)))
{
return $event;
}
$options['data'] = $this->iCal($event);
$options['mimetype'] = 'text/calendar; charset=utf-8';
header('Content-Encoding: identity');
header('ETag: '.$this->get_etag($event));
return true;
}
/**
* Generate an iCal for the given event
*
* Taking into account virtual an real exceptions for recuring events
*
* @param array $event
* @return string
*/
private function iCal(array $event)
{
static $handler = null;
if (is_null($handler)) $handler = $this->_get_handler();
$events = array($event);
// for recuring events we have to add the exceptions
if ($this->client_shared_uid_exceptions && $event['recur_type'] && !empty($event['uid']))
{
$events =& self::get_series($event['uid'],$this->bo);
}
elseif(!$this->client_shared_uid_exceptions && $event['reference'])
{
$events[0]['uid'] .= '-'.$event['id']; // force a different uid
}
return $handler->exportVCal($events,'2.0','PUBLISH');
}
/**
* Get array with events of a series identified by its UID (master and all exceptions)
*
* Maybe that should be part of calendar_bo
*
* @param string $uid UID
* @param calendar_bo $bo=null calendar_bo object to reuse for search call
* @return array
*/
private static function &get_series($uid,calendar_bo $bo=null)
{
if (is_null($bo)) $bo = new calendar_bo();
$events =& $bo->search(array(
'query' => array('cal_uid' => $uid),
'daywise' => false,
'date_format' => 'server',
));
$master = null;
foreach($events as $k => &$recurrence)
{
if (!isset($master)) // first event is always the series master
{
$master =& $events[$k];
//error_log('master: '.array2string($master));
continue; // nothing to change
}
if ($recurrence['id'] != $master['id']) // real exception
{
//error_log('real exception: '.array2string($recurrence));
// remove from masters recur_exception, as exception is include
// at least Lightning "understands" EXDATE as exception from what's included
// in the whole resource / VCALENDAR component
// not removing it causes Lightning to remove the exception itself
if (($k = array_search($recurrence['recurrence'],$master['recur_exception'])) !== false)
{
unset($master['recur_exception'][$k]);
}
continue; // nothing to change
}
// now we need to check if this recurrence is an exception
if ($master['participants'] == $recurrence['participants'])
{
//error_log('NO exception: '.array2string($recurrence));
unset($events[$k]); // no exception --> remove it
continue;
}
// this is a virtual excetion now (no extra event/cal_id in DB)
//error_log('virtual exception: '.array2string($recurrence));
$recurrence['recurrence'] = $recurrence['start'];
$recurrence['reference'] = $master['id'];
$recurrence['recur_type'] = MCAL_RECUR_NONE; // is set, as this is a copy of the master
// not for included exceptions (Lightning): $master['recur_exception'][] = $recurrence['start'];
}
return $events;
}
/**
* Handle put request for an event
*
* @param array &$options
* @param int $id
* @param int $user=null account_id of owner, default null
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
*/
function put(&$options,$id,$user=null)
{
if($this->debug) error_log(__METHOD__."($id, $user)".print_r($options,true));
$return_no_access=true; // as handled by importVCal anyway and allows it to set the status for participants
$event = $this->_common_get_put_delete('PUT',$options,$id,$return_no_access);
if (!is_null($event) && !is_array($event))
{
if($this->debug) error_log(__METHOD__.print_r($event,true).function_backtrace());
return $event;
}
$handler = $this->_get_handler();
if (!is_numeric($id) && ($foundEntries = $handler->find_event($options['content'], 'check')))
{
$id = array_shift($foundEntries);
}
if (!($cal_id = $handler->importVCal($options['content'],is_numeric($id) ? $id : -1,
self::etag2value($this->http_if_match))))
{
if ($this->debug) error_log(__METHOD__."(,$id) importVCal($options[content]) returned false");
return '403 Forbidden';
}
header('ETag: '.$this->get_etag($cal_id));
if (is_null($event) || !$return_no_access) // let lightning think the event is added
{
if ($this->debug) error_log(__METHOD__."(,$id,$user) cal_id=$cal_id, is_null(\$event)=".(int)is_null($event));
header('Location: '.$this->base_uri.self::get_path($cal_id));
return '201 Created';
}
return true;
}
/**
* Fix event series with exceptions, called by calendar_ical::importVCal():
* a) only series master = first event got cal_id from URL
* b) exceptions need to be checked if they are already in DB or new
* c) recurrence-id of (real not virtual) exceptions need to be re-added to master
*
* @param array &$events
*/
static function fix_series(array &$events)
{
foreach($events as $n => $event) error_log(__METHOD__." $n before: ".array2string($event));
$master =& $events[0];
$bo = new calendar_boupdate();
// get array with orginal recurrences indexed by recurrence-id
$org_recurrences = array();
foreach(self::get_series($master['uid'],$bo) as $event)
{
if ($event['recurrence'])
{
$org_recurrences[$event['recurrence']] = $event;
}
}
// assign cal_id's to already existing recurrences and evtl. re-add recur_exception to master
foreach($events as &$recurrence)
{
if ($recurrence['id'] || !$recurrence['recurrence']) continue; // master
// from now on we deal with exceptions
$org_recurrence = $org_recurrences[$recurrence['recurrence']];
if (isset($org_recurrence)) // already existing recurrence
{
error_log(__METHOD__.'() setting id #'.$org_recurrence['id']).' for '.$recurrence['recurrence'].' = '.date('Y-m-d H:i:s',$recurrence['recurrence']);
$recurrence['id'] = $org_recurrence['id'];
// re-add (non-virtual) exceptions to master's recur_exception
if ($recurrence['id'] != $master['id'])
{
error_log(__METHOD__.'() re-adding recur_exception '.$recurrence['recurrence'].' = '.date('Y-m-d H:i:s',$recurrence['recurrence']));
$master['recur_exception'][] = $recurrence['recurrence'];
}
// remove recurrence to be able to detect deleted exceptions
unset($org_recurrences[$recurrence['recurrence']]);
}
}
// delete not longer existing recurrences
foreach($org_recurrences as $org_recurrence)
{
if ($org_recurrence['id'] != $master['id']) // non-virtual recurrence
{
error_log(__METHOD__.'() deleting #'.$org_recurrence['id']);
$bo->delete($org_recurrence['id']); // might fail because of permissions
}
else // virtual recurrence
{
error_log(__METHOD__.'() ToDO: delete virtual exception '.$org_recurrence['recurrence'].' = '.date('Y-m-d H:i:s',$org_recurrence['recurrence']));
// todo: reset status and participants to master default
}
}
foreach($events as $n => $event) error_log(__METHOD__." $n after: ".array2string($event));
}
/**
* Handle delete request for an event
*
* If current user has no right to delete the event, but is an attendee, we reject the event for him.
*
* @todo remove (non-virtual) exceptions, if series master gets deleted
* @param array &$options
* @param int $id
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
*/
function delete(&$options,$id)
{
$return_no_access=true; // to allow to check if current use is a participant and reject the event for him
if (!is_array($event = $this->_common_get_put_delete('DELETE',$options,$id,$return_no_access)) || !$return_no_access)
{
if (!$return_no_access)
{
$ret = isset($event['participants'][$this->bo->user]) &&
$this->bo->set_status($event,$this->bo->user,'R') ? true : '403 Forbidden';
if ($this->debug) error_log(__METHOD__."(,$id) return_no_access=$return_no_access, event[participants]=".array2string($event['participants']).", user={$this->bo->user} --> return $ret");
return $ret;
}
return $event;
}
return $this->bo->delete($id);
}
/**
* Read an entry
*
* @param string/id $id
* @return array/boolean array with entry, false if no read rights, null if $id does not exist
*/
function read($id)
{
//$cal_read = $this->bo->read($id,null,false,'server');//njv: do we actually get anything
if ($this->debug > 1) error_log("bo-ical read :$id:");//njv:
return $this->bo->read($id,null,false,'server');
}
/**
* Get the etag for an entry, reimplemented to include the participants and stati in the etag
*
* @param array/int $event array with event or cal_id
* @return string/boolean string with etag or false
*/
function get_etag($entry)
{
if (!is_array($entry))
{
$entry = $this->read($entry);
}
$etag = $entry['id'].':'.$entry['etag'];
// use new MAX(modification date) of egw_cal_user table (deals with virtual exceptions too)
if (isset($entry['max_user_modified']))
{
$etag .= ':'.$entry['max_user_modified'];
}
else
{
$etag .= ':'.$this->bo->so->max_user_modified($entry['id']);
}
// include exception etags into our own etag, if exceptions are included
if ($this->client_shared_uid_exceptions && !empty($entry['uid']) &&
$entry['recur_type'] != MCAL_RECUR_NONE && $entry['recur_exception'])
{
$events =& $this->bo->search(array(
'query' => array('cal_uid' => $entry['uid']),
'daywise' => false,
'enum_recuring' => false,
'date_format' => 'server',
));
foreach($events as $k => &$recurrence)
{
if ($recurrence['reference']) // ignore series master
{
$etag .= ':'.substr($this->get_etag($recurrence),1,-1);
}
}
}
//error_log(__METHOD__ . "($entry[id] ($entry[etag]): $entry[title] --> etag=$etag");
return '"'.$etag.'"';
}
/**
* Check if user has the neccessary rights on an event
*
* @param int $acl EGW_ACL_READ, EGW_ACL_EDIT or EGW_ACL_DELETE
* @param array/int $event event-array or id
* @return boolean null if entry does not exist, false if no access, true if access permitted
*/
function check_access($acl,$event)
{
return $this->bo->check_perms($acl,$event,0,'server');
}
/**
* Add extra properties for calendar collections
*
* @param array $props=array() regular props by the groupdav handler
* @return array
*/
static function extra_properties(array $props=array())
{
// calendaring URL of the current user
$props[] = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV,'calendar-home-set',$_SERVER['SCRIPT_NAME'].'/');
// email of the current user, see caldav-sheduling draft
$props[] = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV,'calendar-user-address-set','MAILTO:'.$GLOBALS['egw_info']['user']['email']);
// supported components, currently only VEVENT
$props[] = $sc = HTTP_WebDAV_Server::mkprop(groupdav::CALDAV,'supported-calendar-component-set',array(
HTTP_WebDAV_Server::mkprop(groupdav::CALDAV,'comp',array('name' => 'VEVENT')),
// HTTP_WebDAV_Server::mkprop(groupdav::CALDAV,'comp',array('name' => 'VTODO')), // not yet supported
));
return $props;
}
/**
* Get the handler and set the supported fields
*
* @return calendar_ical
*/
private function _get_handler()
{
$handler = new calendar_ical();
$handler->setSupportedFields('GroupDAV',$this->agent);
if ($this->debug > 1) error_log("ical Handler called:" . $this->agent);
return $handler;
}
}
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