VFreeBusy.php

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<?php

namespace Sabre\VObject\Component;

use DateTimeInterface;
use Sabre\VObject;

class VFreeBusy extends VObject\Component {

    function isFree(DateTimeInterface $start, DatetimeInterface $end) {

        foreach ($this->select('FREEBUSY') as $freebusy) {

            // We are only interested in FBTYPE=BUSY (the default),
            // FBTYPE=BUSY-TENTATIVE or FBTYPE=BUSY-UNAVAILABLE.
            if (isset($freebusy['FBTYPE']) && strtoupper(substr((string)$freebusy['FBTYPE'], 0, 4)) !== 'BUSY') {
                continue;
            }

            // The freebusy component can hold more than 1 value, separated by
            // commas.
            $periods = explode(',', (string)$freebusy);

            foreach ($periods as $period) {
                // Every period is formatted as [start]/[end]. The start is an
                // absolute UTC time, the end may be an absolute UTC time, or
                // duration (relative) value.
                list($busyStart, $busyEnd) = explode('/', $period);

                $busyStart = VObject\DateTimeParser::parse($busyStart);
                $busyEnd = VObject\DateTimeParser::parse($busyEnd);
                if ($busyEnd instanceof \DateInterval) {
                    $busyEnd = $busyStart->add($busyEnd);
                }

                if ($start < $busyEnd && $end > $busyStart) {
                    return false;
                }

            }

        }

        return true;

    }

    function getValidationRules() {

        return [
            'UID'     => 1,
            'DTSTAMP' => 1,

            'CONTACT'   => '?',
            'DTSTART'   => '?',
            'DTEND'     => '?',
            'ORGANIZER' => '?',
            'URL'       => '?',

            'ATTENDEE'       => '*',
            'COMMENT'        => '*',
            'FREEBUSY'       => '*',
            'REQUEST-STATUS' => '*',
        ];

    }

}