<?php

namespace Sabre\CalDAV\Xml\Request;

use Sabre\CalDAV\Plugin;
use Sabre\CalDAV\SharingPlugin;
use Sabre\DAV;
use Sabre\DAV\Exception\BadRequest;
use Sabre\Xml\Element\KeyValue;
use Sabre\Xml\Reader;
use Sabre\Xml\XmlDeserializable;

/**
 * Invite-reply POST request parser.
 *
 * This class parses the invite-reply POST request, as defined in:
 *
 * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class InviteReply implements XmlDeserializable
{
    /**
     * The sharee calendar user address.
     *
     * This is the address that the original invite was set to
     *
     * @var string
     */
    public $href;

    /**
     * The uri to the calendar that was being shared.
     *
     * @var string
     */
    public $calendarUri;

    /**
     * The id of the invite message that's being responded to.
     *
     * @var string
     */
    public $inReplyTo;

    /**
     * An optional message.
     *
     * @var string
     */
    public $summary;

    /**
     * Either SharingPlugin::STATUS_ACCEPTED or SharingPlugin::STATUS_DECLINED.
     *
     * @var int
     */
    public $status;

    /**
     * Constructor.
     *
     * @param string $href
     * @param string $calendarUri
     * @param string $inReplyTo
     * @param string $summary
     * @param int    $status
     */
    public function __construct($href, $calendarUri, $inReplyTo, $summary, $status)
    {
        $this->href = $href;
        $this->calendarUri = $calendarUri;
        $this->inReplyTo = $inReplyTo;
        $this->summary = $summary;
        $this->status = $status;
    }

    /**
     * The deserialize method is called during xml parsing.
     *
     * This method is called statically, this is because in theory this method
     * may be used as a type of constructor, or factory method.
     *
     * Often you want to return an instance of the current class, but you are
     * free to return other data as well.
     *
     * You are responsible for advancing the reader to the next element. Not
     * doing anything will result in a never-ending loop.
     *
     * If you just want to skip parsing for this element altogether, you can
     * just call $reader->next();
     *
     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
     * the next element.
     *
     * @return mixed
     */
    public static function xmlDeserialize(Reader $reader)
    {
        $elems = KeyValue::xmlDeserialize($reader);

        $href = null;
        $calendarUri = null;
        $inReplyTo = null;
        $summary = null;
        $status = null;

        foreach ($elems as $name => $value) {
            switch ($name) {
                case '{'.Plugin::NS_CALENDARSERVER.'}hosturl':
                    foreach ($value as $bla) {
                        if ('{DAV:}href' === $bla['name']) {
                            $calendarUri = $bla['value'];
                        }
                    }
                    break;
                case '{'.Plugin::NS_CALENDARSERVER.'}invite-accepted':
                    $status = DAV\Sharing\Plugin::INVITE_ACCEPTED;
                    break;
                case '{'.Plugin::NS_CALENDARSERVER.'}invite-declined':
                    $status = DAV\Sharing\Plugin::INVITE_DECLINED;
                    break;
                case '{'.Plugin::NS_CALENDARSERVER.'}in-reply-to':
                    $inReplyTo = $value;
                    break;
                case '{'.Plugin::NS_CALENDARSERVER.'}summary':
                    $summary = $value;
                    break;
                case '{DAV:}href':
                    $href = $value;
                    break;
            }
        }
        if (is_null($calendarUri)) {
            throw new BadRequest('The {http://calendarserver.org/ns/}hosturl/{DAV:}href element must exist');
        }

        return new self($href, $calendarUri, $inReplyTo, $summary, $status);
    }
}
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