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<?php
/**
* XML utilities for CalDAV
*
* This class contains a few static methods used for parsing certain CalDAV
* requests.
*
* @package Sabre
* @subpackage CalDAV
* @copyright Copyright (C) 2007-2011 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_CalDAV_XMLUtil {
/**
* This function parses the calendar-query report request body
*
* The body is quite complicated, so we're turning it into a PHP
* array.
*
* The resulting associative array has xpath expressions as keys.
* By default the xpath expressions should simply be checked for existance
* The xpath expressions can point to elements or attributes.
*
* The array values can contain a number of items, which alters the query
* filter.
*
* * time-range. Must also check if the todo or event falls within the
* specified timerange. How this is interpreted depends on
* the type of object (VTODO, VEVENT, VJOURNAL, etc)
* * is-not-defined
* Instead of checking if the attribute or element exist,
* we must check if it doesn't.
* * text-match
* Checks if the value of the attribute or element matches
* the specified value. This is actually another array with
* the 'collation', 'value' and 'negate-condition' items.
*
* Refer to the CalDAV spec for more information.
*
* @param DOMNode $domNode
* @param string $basePath used for recursive calls.
* @param array $filters used for recursive calls.
* @return array
*/
static public function parseCalendarQueryFilters($domNode,$basePath = '/c:iCalendar', &$filters = array()) {
foreach($domNode->childNodes as $child) {
switch(Sabre_DAV_XMLUtil::toClarkNotation($child)) {
case '{urn:ietf:params:xml:ns:caldav}comp-filter' :
case '{urn:ietf:params:xml:ns:caldav}prop-filter' :
$filterName = $basePath . '/' . 'c:' . strtolower($child->getAttribute('name'));
$filters[$filterName] = array();
self::parseCalendarQueryFilters($child, $filterName,$filters);
break;
case '{urn:ietf:params:xml:ns:caldav}time-range' :
if ($start = $child->getAttribute('start')) {
$start = self::parseICalendarDateTime($start);
} else {
$start = null;
}
if ($end = $child->getAttribute('end')) {
$end = self::parseICalendarDateTime($end);
} else {
$end = null;
}
if (!is_null($start) && !is_null($end) && $end <= $start) {
throw new Sabre_DAV_Exception_BadRequest('The end-date must be larger than the start-date in the time-range filter');
}
$filters[$basePath]['time-range'] = array(
'start' => $start,
'end' => $end
);
break;
case '{urn:ietf:params:xml:ns:caldav}is-not-defined' :
$filters[$basePath]['is-not-defined'] = true;
break;
case '{urn:ietf:params:xml:ns:caldav}param-filter' :
$filterName = $basePath . '/@' . strtolower($child->getAttribute('name'));
$filters[$filterName] = array();
self::parseCalendarQueryFilters($child, $filterName, $filters);
break;
case '{urn:ietf:params:xml:ns:caldav}text-match' :
$collation = $child->getAttribute('collation');
if (!$collation) $collation = 'i;ascii-casemap';
$filters[$basePath]['text-match'] = array(
'collation' => ($collation == 'default'?'i;ascii-casemap':$collation),
'negate-condition' => $child->getAttribute('negate-condition')==='yes',
'value' => $child->nodeValue,
);
break;
}
}
return $filters;
}
/**
* Parses an iCalendar (rfc5545) formatted datetime and returns a DateTime object
*
* Specifying a reference timezone is optional. It will only be used
* if the non-UTC format is used. The argument is used as a reference, the
* returned DateTime object will still be in the UTC timezone.
*
* @param string $dt
* @param DateTimeZone $tz
* @return DateTime
*/
static public function parseICalendarDateTime($dt,DateTimeZone $tz = null) {
// Format is YYYYMMDD + "T" + hhmmss
$result = preg_match('/^([1-3][0-9]{3})([0-1][0-9])([0-3][0-9])T([0-2][0-9])([0-5][0-9])([0-5][0-9])([Z]?)$/',$dt,$matches);
if (!$result) {
throw new Sabre_DAV_Exception_BadRequest('The supplied iCalendar datetime value is incorrect: ' . $dt);
}
if ($matches[7]==='Z' || is_null($tz)) {
$tz = new DateTimeZone('UTC');
}
$date = new DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3] . ' ' . $matches[4] . ':' . $matches[5] .':' . $matches[6], $tz);
// Still resetting the timezone, to normalize everything to UTC
$date->setTimeZone(new DateTimeZone('UTC'));
return $date;
}
/**
* Parses an iCalendar (rfc5545) formatted datetime and returns a DateTime object
*
* @param string $date
* @param DateTimeZone $tz
* @return DateTime
*/
static public function parseICalendarDate($date) {
// Format is YYYYMMDD
$result = preg_match('/^([1-3][0-9]{3})([0-1][0-9])([0-3][0-9])$/',$date,$matches);
if (!$result) {
throw new Sabre_DAV_Exception_BadRequest('The supplied iCalendar date value is incorrect: ' . $date);
}
$date = new DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3], new DateTimeZone('UTC'));
return $date;
}
/**
* Parses an iCalendar (RFC5545) formatted duration and returns a string suitable
* for strtotime or DateTime::modify.
*
* NOTE: When we require PHP 5.3 this can be replaced by the DateTimeInterval object, which
* supports ISO 8601 Intervals, which is a superset of ICalendar durations.
*
* For now though, we're just gonna live with this messy system
*
* @param string $duration
* @return string
*/
static public function parseICalendarDuration($duration) {
$result = preg_match('/^(?P<plusminus>\+|-)?P((?P<week>\d+)W)?((?P<day>\d+)D)?(T((?P<hour>\d+)H)?((?P<minute>\d+)M)?((?P<second>\d+)S)?)?$/', $duration, $matches);
if (!$result) {
throw new Sabre_DAV_Exception_BadRequest('The supplied iCalendar duration value is incorrect: ' . $duration);
}
$parts = array(
'week',
'day',
'hour',
'minute',
'second',
);
$newDur = '';
foreach($parts as $part) {
if (isset($matches[$part]) && $matches[$part]) {
$newDur.=' '.$matches[$part] . ' ' . $part . 's';
}
}
$newDur = ($matches['plusminus']==='-'?'-':'+') . trim($newDur);
return $newDur;
}
}
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