mirror of
https://github.com/EGroupware/egroupware.git
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606 lines
18 KiB
PHP
606 lines
18 KiB
PHP
<?php
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/**
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* EGroupware: iSchedule server
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage groupdav
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2012 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* iSchedule server: serverside of iSchedule
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*
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* @link https://tools.ietf.org/html/draft-desruisseaux-ischedule-01 iSchedule draft from 2010
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*
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* groupdav get's extended here to get it's logging, should separate that out ...
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*/
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class ischedule_server extends groupdav
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{
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/**
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* iSchedule xml namespace
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*/
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const ISCHEDULE = 'urn:ietf:params:xml:ns:ischedule';
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/**
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* Own iSchedule version
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*/
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const VERSION = '1.0';
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/**
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* Required headers in DKIM signature (DKIM-Signature is always a required header!)
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*/
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const REQUIRED_DKIM_HEADERS = 'iSchedule-Version:iSchedule-Message-ID:Content-Type:Originator:Recipient';
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public function __construct()
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{
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// install our own exception handler sending exceptions as http status
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set_exception_handler(array(__CLASS__, 'exception_handler'));
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self::$instance = $this;
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}
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/**
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* Serve an iSchedule request
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*/
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public function ServeRequest()
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{
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self::$log_level = $GLOBALS['egw_info']['user']['preferences']['groupdav']['debug_level'];
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self::$log_level = 'f';
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if (self::$log_level === 'r' || self::$log_level === 'f' || $this->debug)
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{
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self::$request_starttime = microtime(true);
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$this->store_request = true;
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ob_start();
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}
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// get raw request body
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$this->request = file_get_contents('php://input');
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switch($_SERVER['REQUEST_METHOD'])
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{
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case 'GET':
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$this->get();
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break;
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case 'POST':
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$this->post();
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break;
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default:
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error_log(__METHOD__."() invalid iSchedule request using {$_SERVER['REQUEST_METHOD']}!");
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header("HTTP/1.1 400 Bad Request");
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}
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if (self::$request_starttime) self::log_request();
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}
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static $supported_components = array('VEVENT', 'VFREEBUSY', 'VTODO');
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/**
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* Requiremnt for originator to match depending on method
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*
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* @var array method => array('ORGANIZER','ATTENDEE')
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* @link https://tools.ietf.org/html/draft-desruisseaux-ischedule-01#section-6.1
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*/
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static $supported_method2origin_requirement = array(
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//'PUBLISH' => null, // no requirement
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'REQUEST' => array('ORGANIZER', 'ATTENDEE'),
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'REPLY' => array('ATTENDEE'),
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'ADD' => array('ORGANIZER'),
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'CANCEL' => array('ORGANIZER'),
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//'REFRESH' => null,
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//'COUNTER' => array('ATTENDEE'),
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//'DECLINECOUNTER' => array('ORGANIZER'),
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);
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/**
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* Serve an iSchedule POST request
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*/
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public function post()
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{
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// get and verify required headers
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$headers = array();
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foreach($_SERVER as $name => $value)
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{
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$name = strtolower(str_replace('_', '-', $name));
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list($first, $rest) = explode('-', $name, 2);
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switch($first)
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{
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case 'content':
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$headers[$name] = $value;
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break;
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case 'http':
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$headers[$rest] = $value;
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break;
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}
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}
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if (($missing = array_diff(explode(':', strtolower(self::REQUIRED_DKIM_HEADERS.':DKIM-Signature')), array_keys($headers))))
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{
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error_log(array2string(array_keys($headers)));
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throw new Exception ('Bad Request: missing required headers: '.implode(', ', $missing), 400);
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}
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// validate dkim signature
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if (!self::dkim_validate($headers, $this->request, $error))
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{
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throw new Exception('Bad Request: DKIM signature invalid: '.$error, 400);
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}
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// check if recipient is a user
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// ToDo: multiple recipients
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if (!($account_id = $GLOBALS['egw']->accounts->name2id($headers['recipient'], 'account_email')))
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{
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throw new Exception('Bad Request: unknown recipient', 400);
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}
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// create enviroment for recipient user, as we act on his behalf
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$GLOBALS['egw']->session->account_id = $account_id;
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$GLOBALS['egw']->session->account_lid = $GLOBALS['egw']->accounts->id2name($account_id);
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//$GLOBALS['egw']->session->account_domain = $domain;
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$GLOBALS['egw_info']['user'] = $GLOBALS['egw']->session->read_repositories();
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translation::init();
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// check originator is allowed to iSchedule with recipient
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// ToDo: preference for user/admin to specify with whom to iSchedule: $allowed_origins
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$allowed_origins = preg_split('/, ?/', $GLOBALS['egw_info']['user']['groupdav']['ischedule_allowed_origins']);
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/* disabled 'til UI is ready to specifiy
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list(,$originator_domain) = explode('@', $headers['Originator']);
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if (!in_array($headers['Originator'], $allowed_orgins) && !in_array($originator_domain, $allowed_origins))
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{
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throw new Exception('Forbidden', 403);
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}*/
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// check method and component of Content-Type are valid
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if (!preg_match('/component=([^;]+)/i', $headers['content-type'], $matches) ||
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(!in_array($component=strtoupper($matches[1]), self::$supported_components)))
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{
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throw new Exception ('Bad Request: missing or unsupported component in Content-Type header', 400);
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}
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if (!preg_match('/method=([^;]+)/i', $headers['content-type'], $matches) ||
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(!isset(self::$supported_method2origin_requirement[$method=strtoupper($matches[1])])) ||
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$component == 'VFREEBUSY' && $method != 'REQUEST')
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{
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throw new Exception ('Bad Request: missing or unsupported method in Content-Type header', 400);
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}
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// parse iCal
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// code copied from calendar_groupdav::outbox_freebusy_request for now
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include_once EGW_SERVER_ROOT.'/phpgwapi/inc/horde/lib/core.php';
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$vcal = new Horde_iCalendar();
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if (!$vcal->parsevCalendar($this->request, 'VCALENDAR', 'utf-8'))
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{
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throw new Exception('Bad Request: Failed parsing iCal', 400);
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}
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$version = $vcal->getAttribute('VERSION');
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$handler = new calendar_ical();
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$handler->setSupportedFields('GroupDAV',$this->agent);
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$handler->calendarOwner = $handler->user = 0; // to NOT default owner/organizer to something
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if (!($vcal_comp = $vcal->getComponent(0)) ||
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!($event = $handler->vevent2egw($vcal_comp, $version, $handler->supportedFields,
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$principalURL='', $check_component='Horde_iCalendar_'.strtolower($component))))
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{
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throw new Exception('Bad Request: Failed converting iCal', 400);
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}
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// validate originator matches organizer or attendee
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$originator_requirement = self::$supported_method2origin_requirement[$method];
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if (isset($originator_requirement))
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{
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$matches = false;
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foreach($originator_requirement as $requirement)
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{
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if ($requirement == 'ORGANIZER' &&
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($event['organizer'] == $headers['originator'] || strpos($event['organizer'], '<'.$headers['originator'].'>') !== false) ||
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$requirement == 'ATTENDEE' &&
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(in_array('e'.$headers['originator'], $event['participants']) ||
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// ToDO: Participant could have CN, need to check that too
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$originator_account_id = $GLOBALS['egw']->accounts->name2id($headers['originator'], 'account_email') &&
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in_array($originator_account_id, $event['participants'])))
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{
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$matches = true;
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break; // no need to try further as we OR
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}
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}
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if (!$matches)
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{
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throw new Exception('Bad Request: originator invalid for given '.$component.'!', 400);
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}
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}
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$xml = new XMLWriter;
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$xml->openMemory();
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$xml->setIndent(true);
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$xml->startDocument('1.0', 'UTF-8');
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$xml->startElementNs(null, 'schedule-response', self::ISCHEDULE); // null = no prefix
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switch($component)
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{
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case 'VFREEBUSY':
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$this->vfreebusy($event, $handler, $vcal_comp, $xml);
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break;
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case 'VEVENT':
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$this->vevent($event, $handler, $component, $xml);
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break;
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default:
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throw new exception('Not yet implemented!');
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}
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$xml->endElement(); // schedule-response
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$xml->endDocument();
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header('Content-Type: text/xml; charset=UTF-8');
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header('iSchedule-Version: '.self::VERSION);
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echo $xml->outputMemory();
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}
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/**
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* Handle VEVENT component
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*
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* @param array $event
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* @param calendar_ical $handler
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* @param string $component
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* @param XMLWriter $xml
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*/
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function vevent(array $event, calendar_ical $handler, Horde_iCalendar_vevent $component, XMLWriter $xml)
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{
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$organizer = $component->getAttribute('ORGANIZER');
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$attendees = (array)$component->getAttribute('ATTENDEE');
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$handler->importVCal($vCalendar, $eventId,
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self::etag2value($this->http_if_match), false, 0, $this->groupdav->current_user_principal, $user, $charset, $id);
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foreach($event['participants'] as $uid => $status)
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{
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$xml->startElement('response');
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$xml->writeElement('recipient', $attendee=array_shift($attendees)); // iSchedule has not DAV:href!
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if (is_numeric($uid))
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{
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$xml->writeElement('request-status', '2.0;Success');
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$xml->writeElement('responsedescription', 'Delivered to recipient');
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}
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else
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{
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$xml->writeElement('request-status', '3.7;Invalid Calendar User');
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$xml->writeElement('responsedescription', 'Recipient not a local user');
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}
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$xml->endElement(); // response
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}
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}
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/**
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* Handle VFREEBUSY component
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*
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* @param array $event
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* @param calendar_ical $handler
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* @param Horde_iCalendar_vfreebusy $component
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* @param XMLWriter $xml
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*/
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function vfreebusy(array $event, calendar_ical $handler, Horde_iCalendar_vfreebusy $component, XMLWriter $xml)
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{
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$organizer = $component->getAttribute('ORGANIZER');
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$attendees = (array)$component->getAttribute('ATTENDEE');
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foreach($event['participants'] as $uid => $status)
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{
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$xml->startElement('response');
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$xml->writeElement('recipient', $attendee=array_shift($attendees)); // iSchedule has not DAV:href!
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if (is_numeric($uid))
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{
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$xml->writeElement('request-status', '2.0;Success');
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$xml->writeElement('calendar-data',
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$handler->freebusy($uid, $event['end'], true, 'utf-8', $event['start'], 'REPLY', array(
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'UID' => $event['uid'],
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'ORGANIZER' => $organizer,
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'ATTENDEE' => $attendee,
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)));
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}
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else
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{
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$xml->writeElement('request-status', '3.7;Invalid Calendar User');
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}
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$xml->endElement(); // response
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}
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}
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/**
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* Validate DKIM signature
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*
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* @param array $headers header-name in lowercase(!) as key
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* @param string $body
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* @param string &$error=null error if false returned
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* @return boolean true if signature could be validated, false otherwise
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* @todo other dkim q= methods: http/well-known bzw private-exchange
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*/
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public static function dkim_validate(array $headers, $body, &$error=null, $required_headers=self::REQUIRED_DKIM_HEADERS)
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{
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// parse dkim siginature
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if (!isset($headers['dkim-signature']) ||
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!preg_match_all('/[\t\s]*([a-z]+)=([^;]+);?/i', $headers['dkim-signature'], $matches))
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{
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$error = "Can't parse DKIM signature";
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return false;
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}
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$dkim = array_combine($matches[1], $matches[2]);
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if (($missing=array_diff(explode(':', strtolower($required_headers)), explode(':', strtolower($dkim['h'])))))
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{
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$error = "Missing required headers: ".implode(', ', $missing);
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return false;
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}
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// create headers array
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$dkim_headers = array();
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foreach(explode(':', strtolower($dkim['h'])) as $header)
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{
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$dkim_headers[] = $header.': '.$headers[$header];
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}
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list($dkim_unsigned) = explode('b='.$dkim['b'], 'DKIM-Signature: '.$headers['dkim-signature']);
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$dkim_unsigned .= 'b=';
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list($header_canon, $body_canon) = explode('/', $dkim['c']);
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require_once EGW_API_INC.'/php-mail-domain-signer/lib/class.mailDomainSigner.php';
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// Canonicalization for Body
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switch($body_canon)
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{
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case 'relaxed':
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$_b = mailDomainSigner::bodyRelaxCanon($body);
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break;
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case 'simple':
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$_b = mailDomainSigner::bodySimpleCanon($body);
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break;
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default:
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$error = "Unknown body canonicalization '$body_canon'";
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return false;
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}
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// Hash of the canonicalized body [tag:bh]
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list(,$hash_algo) = explode('/', $dkim['a']);
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$_bh= base64_encode(hash($hash_algo, $_b, true));
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// check body hash
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if ($_bh != $dkim['bh'])
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{
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$error = 'Body hash does NOT verify';
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error_log(__METHOD__."() body-hash='$_bh' != '$dkim[bh]'=dkim-bh $error");
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return false;
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}
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// Canonicalization Header Data
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switch($header_canon)
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{
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case 'relaxed':
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$_unsigned = mailDomainSigner::headRelaxCanon(implode("\r\n", $dkim_headers). "\r\n".$dkim_unsigned);
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break;
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case 'simple':
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$_unsigned = mailDomainSigner::headSimpleCanon(implode("\r\n", $dkim_headers). "\r\n".$dkim_unsigned);
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break;
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default:
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$error = "Unknown header canonicalization '$header_canon'";
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return false;
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}
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error_log(__METHOD__."() unsigned='$_unsigned'");
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// fetch public key q=dns/txt method
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// ToDo other $dkim[q] methods: http/well-known bzw private-exchange
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if (!($dns = self::fetch_dns($dkim['d'], $dkim['s'])))
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{
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$error = "No public key for d='$dkim[d]' and s='$dkim[s]'";
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return false;
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}
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$public_key = "-----BEGIN PUBLIC KEY-----\n".chunk_split($dns['p'], 64, "\n")."-----END PUBLIC KEY-----\n";
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$ok = openssl_verify($_unsigned, base64_decode($dkim['b']), $public_key);
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switch($ok)
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{
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case -1:
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$error = 'Error while verifying DKIM';
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return false;
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case 0:
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$error = 'DKIM signature does NOT verify';
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error_log(__METHOD__."() unsigned='$_unsigned' $error");
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return false;
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}
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return true;
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}
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/**
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* Fetch dns record and return parsed array
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*
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* @param string $domain
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* @param string $selector
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* @return array with values for keys parsed from eg. "v=DKIM1\;k=rsa\;h=sha1\;s=calendar\;t=s\;p=..."
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*/
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public static function fetch_dns($domain, $selector='calendar')
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{
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if (!($records = dns_get_record($host=$selector.'._domainkey.'.$domain, DNS_TXT))) return false;
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if (!isset($records[0]['text']) &&
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!preg_match_all('/[\t\s]*([a-z]+)=([^;]+);?/i', $records[0]['txt'], $matches))
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{
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return false;
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}
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return array_combine($matches[1], $matches[2]);
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}
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/**
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* Serve an iSchedule GET request, currently only action=capabilities
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*
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* GET /.well-known/ischedule?action=capabilities HTTP/1.1
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* Host: cal.example.com
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*
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* HTTP/1.1 200 OK
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* Date: Mon, 15 Dec 2008 09:32:12 GMT
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* Content-Type: application/xml; charset=utf-8
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* Content-Length: xxxx
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* iSchedule-Version: 1.0
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* ETag: "afasdf-132afds"
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*
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* <?xml version="1.0" encoding="utf-8" ?>
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* <query-result xmlns="urn:ietf:params:xml:ns:ischedule">
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* <capabilities>
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* <versions>
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* <version>1.0</version>
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* </versions>
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* <scheduling-messages>
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* <component name="VEVENT">
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* <method name="REQUEST"/>
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* <method name="ADD"/>
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* <method name="REPLY"/>
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* <method name="CANCEL"/>
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* </component>
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* <component name="VTODO"/>
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* <component name="VFREEBUSY"/>
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* </scheduling-messages>
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* <calendar-data-types>
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* <calendar-data-type content-type="text/calendar" version="2.0"/>
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* </calendar-data-types>
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* <attachmens>
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* <inline/>
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* <external/>
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* </attachments>
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* <supported-recipient-uri-scheme-set>
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* <scheme>mailto</scheme>
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* </supported-recipient-uri-scheme-set>
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* <max-content-length>102400</max-content-length>
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* <min-date-time>19910101T000000Z</min-date-time>
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* <max-date-time>20381231T000000Z</max-date-time>
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* <max-instances>150</max-instances>
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* <max-recipients>250</max-recipients>
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* <administrator>mailto:ischedule-admin@example.com</administrator>
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* </capabilities>
|
|
* </query-result>
|
|
*/
|
|
public function get()
|
|
{
|
|
if (!isset($_GET['action']) || $_GET['action'] !== 'capabilities')
|
|
{
|
|
error_log(__METHOD__."() invalid iSchedule request using GET without action=capabilities!");
|
|
header("HTTP/1.1 400 Bad Request");
|
|
return;
|
|
}
|
|
|
|
// generate capabilities
|
|
/*$xml = new XMLWriter;
|
|
$xml->openMemory();
|
|
$xml->setIndent(true);
|
|
$xml->startDocument('1.0', 'UTF-8');
|
|
$xml->startElementNs(null, 'query-result', self::ISCHEDULE);
|
|
$xml->startElement('capability-set');
|
|
|
|
foreach(array(
|
|
'versions' => array('version' => array('1.0')),
|
|
'scheduling-messages' => array(
|
|
'component' => array('.name' => array(
|
|
'VEVENT' => array('method' => array('REQUEST', 'ADD', 'REPLY', 'CANCEL')),
|
|
'VTODO' => '',
|
|
'VFREEBUSY' => '',
|
|
)),
|
|
)
|
|
) as $name => $data)
|
|
{
|
|
$xml->writeElement($name, $data);
|
|
}
|
|
|
|
$xml->endElement(); // capability-set
|
|
$xml->endElement(); // query-result
|
|
$xml->endDocument();
|
|
$capabilities = $xml->outputMemory();*/
|
|
|
|
$capabilities = '<?xml version="1.0" encoding="utf-8" ?>
|
|
<query-result xmlns="urn:ietf:params:xml:ns:ischedule">
|
|
<capabilities>
|
|
<versions>
|
|
<version>1.0</version>
|
|
</versions>
|
|
<scheduling-messages>
|
|
<component name="VEVENT">
|
|
<method name="REQUEST"/>
|
|
<method name="ADD"/>
|
|
<method name="REPLY"/>
|
|
<method name="CANCEL"/>
|
|
</component>
|
|
<component name="VTODO"/>
|
|
<component name="VFREEBUSY"/>
|
|
</scheduling-messages>
|
|
<calendar-data-types>
|
|
<calendar-data-type content-type="text/calendar" version="2.0"/>
|
|
</calendar-data-types>
|
|
<attachments>
|
|
<inline/>
|
|
<external/>
|
|
</attachments>
|
|
<supported-recipient-uri-scheme-set>
|
|
<scheme>mailto</scheme>
|
|
</supported-recipient-uri-scheme-set>
|
|
<max-content-length>102400</max-content-length>
|
|
<min-date-time>19910101T000000Z</min-date-time>
|
|
<max-date-time>20381231T000000Z</max-date-time>
|
|
<max-instances>150</max-instances>
|
|
<max-recipients>250</max-recipients>
|
|
<administrator>mailto:ischedule-admin@example.com</administrator>
|
|
</capabilities>
|
|
</query-result>';
|
|
|
|
// returning capabilities
|
|
header('Content-Type: application/xml; charset=utf-8');
|
|
header('iSchedule-Version: '.self::VERSION);
|
|
header('Content-Length: '.bytes($capabilites));
|
|
header('ETag: "'.md5($capabilites).'"');
|
|
|
|
echo $capabilities;
|
|
common::egw_exit();
|
|
}
|
|
|
|
/**
|
|
* Exception handler, which additionally logs the request (incl. a trace)
|
|
*
|
|
* Does NOT return and get installed in constructor.
|
|
*
|
|
* @param Exception $e
|
|
*/
|
|
public static function exception_handler(Exception $e)
|
|
{
|
|
// logging exception as regular egw_execption_hander does
|
|
_egw_log_exception($e,$headline);
|
|
|
|
// exception handler sending message back to the client as http status
|
|
$code = $e->getCode();
|
|
$msg = $e->getMessage();
|
|
if (!in_array($code, array(400, 403, 407, 503))) $code = 500;
|
|
header('HTTP/1.1 '.$code.' '.$msg);
|
|
|
|
// if our groupdav logging is active, log the request plus a trace, if enabled in server-config
|
|
if (groupdav::$request_starttime && isset(self::$instance))
|
|
{
|
|
if ($GLOBALS['egw_info']['server']['exception_show_trace'])
|
|
{
|
|
self::$instance->log_request("\n".$e->getTraceAsString()."\n");
|
|
}
|
|
else
|
|
{
|
|
self::$instance->log_request();
|
|
}
|
|
}
|
|
if (is_object($GLOBALS['egw']))
|
|
{
|
|
common::egw_exit();
|
|
}
|
|
exit;
|
|
}
|
|
}
|