/**
* Verify if a list of filters applies to the calendar data object
*
* The calendarData object must be a valid iCalendar blob. The list of
* filters must be formatted as parsed by Sabre_CalDAV_Plugin::parseCalendarQueryFilters
*
* @param string $calendarData
* @param array $filters
* @return bool
*/
public function validateFilters($calendarData, $filters)
{
// We are converting the calendar object to an XML structure
// This makes it far easier to parse
$xCalendarData = Sabre_CalDAV_ICalendarUtil::toXCal($calendarData);
$xml = simplexml_load_string($xCalendarData);
$xml->registerXPathNamespace('c', 'urn:ietf:params:xml:ns:xcal');
foreach ($filters as $xpath => $filter) {
// if-not-defined comes first
if (isset($filter['is-not-defined'])) {
if (!$xml->xpath($xpath)) {
continue;
} else {
return false;
}
}
$elem = $xml->xpath($xpath);
if (!$elem) {
return false;
}
$elem = $elem[0];
if (isset($filter['time-range'])) {
switch ($elem->getName()) {
case 'vevent':
$result = $this->validateTimeRangeFilterForEvent($xml, $xpath, $filter);
if ($result === false) {
return false;
}
break;
case 'vtodo':
$result = $this->validateTimeRangeFilterForTodo($xml, $xpath, $filter);
if ($result === false) {
return false;
}
break;
case 'vjournal':
case 'vfreebusy':
case 'valarm':
// TODO: not implemented
break;
/*
case 'vjournal' :
$result = $this->validateTimeRangeFilterForJournal($xml,$xpath,$filter);
if ($result===false) return false;
break;
case 'vfreebusy' :
$result = $this->validateTimeRangeFilterForFreeBusy($xml,$xpath,$filter);
if ($result===false) return false;
break;
case 'valarm' :
$result = $this->validateTimeRangeFilterForAlarm($xml,$xpath,$filter);
if ($result===false) return false;
break;
*/
}
}
if (isset($filter['text-match'])) {
$currentString = (string) $elem;
$isMatching = Sabre_DAV_StringUtil::textMatch($currentString, $filter['text-match']['value'], $filter['text-match']['collation']);
if ($filter['text-match']['negate-condition'] && $isMatching) {
return false;
}
if (!$filter['text-match']['negate-condition'] && !$isMatching) {
return false;
}
}
}
return true;
}
/**
* Validates if a text-filter can be applied to a specific property.
*
* @param array $texts
* @param array $filters
* @param string $test
* @return bool
*/
protected function validateTextMatches(array $texts, array $filters, $test)
{
foreach ($filters as $filter) {
$success = false;
foreach ($texts as $haystack) {
$success = Sabre_DAV_StringUtil::textMatch($haystack, $filter['value'], $filter['collation'], $filter['match-type']);
// Breaking on the first match
if ($success) {
break;
}
}
if ($filter['negate-condition']) {
$success = !$success;
}
if ($success && $test === 'anyof') {
return true;
}
if (!$success && $test == 'allof') {
return false;
}
}
// If we got all the way here, it means we haven't been able to
// determine early if the test failed or not.
//
// This implies for 'anyof' that the test failed, and for 'allof' that
// we succeeded. Sounds weird, but makes sense.
return $test === 'allof';
}
/**
* This method checks the validity of a text-match.
*
* A single text-match should be specified as well as the specific property
* or parameter we need to validate.
*
* @param Sabre_VObject_Node $parent
* @param array $textMatch
* @return bool
*/
protected function validateTextMatch(Sabre_VObject_Node $parent, array $textMatch)
{
$value = (string) $parent;
$isMatching = Sabre_DAV_StringUtil::textMatch($value, $textMatch['value'], $textMatch['collation']);
return $textMatch['negate-condition'] xor $isMatching;
}