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Editing: VFreeBusy.php

<?php

namespace Sabre\VObject\Component;

use DateTimeInterface;
use Sabre\VObject;

/**
 * The VFreeBusy component.
 *
 * This component adds functionality to a component, specific for VFREEBUSY
 * components.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class VFreeBusy extends VObject\Component
{
    /**
     * Checks based on the contained FREEBUSY information, if a timeslot is
     * available.
     *
     * @return bool
     */
    public 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']) && 'BUSY' !== strtoupper(substr((string) $freebusy['FBTYPE'], 0, 4))) {
                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;
    }

/**
     * A simple list of validation rules.
     *
     * This is simply a list of properties, and how many times they either
     * must or must not appear.
     *
     * Possible values per property:
     *   * 0 - Must not appear.
     *   * 1 - Must appear exactly once.
     *   * + - Must appear at least once.
     *   * * - Can appear any number of times.
     *   * ? - May appear, but not more than once.
     *
     * @var array
     */
    public function getValidationRules()
    {
        return [
            'UID' => 1,
            'DTSTAMP' => 1,

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

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

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