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<?php
class vobject_sanitize
{
public $vobject;
private $components = array('VEVENT', 'VTODO', 'VJOURNAL', 'VFREEBUSY', 'VTIMEZONE', 'VCARD', 'VALARM');
private $properties = array();
public function __construct($vobject, $properties = array(), $method = 'serialize')
{
$this->vobject = $vobject;
$this->properties = (array) $properties;
$this->_unfoald();
$this->_eol();
switch($method){
case 'serialize':
$this->_serialize();
break;
case 'unserialize':
$this->_unserialize();
break;
}
}
private function _unfoald()
{
$data = array();
$content = explode("\n", $this->vobject);
for($i = 0; $i < count($content); $i++){
$line = rtrim($content[$i]);
while(isset($content[$i + 1]) && strlen($content[$i + 1]) > 0 && ($content[$i+1]{0} == ' ' || $content[$i + 1]{0} == "\t" )){
$line .= rtrim(substr($content[++$i], 1));
}
$data[] = $line;
}
$this->vobject = implode(PHP_EOL, $data);
}
private function _eol()
{
$this->vobject = preg_replace('/\s\s+/', PHP_EOL, $this->vobject);
}
private function _serialize()
{
$tokens = array();
foreach($this->components as $component){
$regex = '#BEGIN:' . $component . '(?:(?!BEGIN:' . $component . ').)*?END:' . $component . '#si';
preg_match_all($regex, $this->vobject, $matches);
foreach($matches as $part){
foreach($part as $match){
$token = md5($match);
$tokens[$token] = $match;
$this->vobject = str_replace($match, '***' . $token . '***', $this->vobject);
}
}
foreach($tokens as $token => $content){
foreach($this->properties as $property){
$content = preg_replace('#' . PHP_EOL . $property . ':#i', PHP_EOL . 'X-ICAL-SANITIZE-' . $property . ':', $content, 1);
$content = preg_replace('#' . PHP_EOL . $property . ':#i', ',', $content);
$content = str_replace(PHP_EOL . 'X-ICAL-SANITIZE-' . $property . ':', PHP_EOL . $property . ':', $content);
$this->vobject = str_replace('***' . $token . '***', $content, $this->vobject);
}
}
}
}
private function _unserialize()
{
foreach($this->properties as $property){
preg_match_all('#' . PHP_EOL . $property . '.*:.*,.*' . PHP_EOL . '#i', $this->vobject, $matches);
$content = $this->vobject;
if(is_array($matches)){
foreach($matches[0] as $match){
$temp = explode(':', $match, 2);
$field = $temp[0];
$values = $temp[1];
$properties = explode(';', $field);
$tz = false;
foreach($properties as $idx => $property){
if(strtolower(substr($property, 0, 5)) == 'tzid='){
$temp = explode('=', $property, 2);
$tz = $temp[1];
unset($properties[$idx]);
}
if(strtolower(substr($property, 0, 6)) == 'value='){
$temp = explode('=', $property, 2);
$daot = $temp[1];
}
}
$field = implode(';', $properties);
$values = explode(',', $values);
$line = '';
foreach($values as $value){
if($tz){
$datetime = new DateTime($value, new DateTimeZone($tz));
if(strtolower($daot) == 'date-time'){
$ts = $datetime->format('U');
$value = gmdate('Ymd\THis\Z', $ts);
}
}
$line .= $field . ':' . $value . PHP_EOL;
}
$content = preg_replace('/\s\s+/', PHP_EOL, str_replace($match, $line, $content));
}
}
$this->vobject = $content;
}
}
}
?>
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