forked from extern/egroupware
415 lines
13 KiB
PHP
415 lines
13 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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class ischedule_server
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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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* Serve an iSchedule request
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*/
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public function ServeRequest()
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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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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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}
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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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protected function post()
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{
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static $required_headers = array('Host','Recipient','Originator','Content-Type','DKIM-Signature');
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$headers = array();
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foreach($required_headers as $header)
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{
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$server_name = strtoupper(str_replace('-', '_', $header));
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if (strpos($server_name, 'CONTENT_') !== 0) $server_name = 'HTTP_'.$server_name;
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if (!empty($_SERVER[$server_name])) $headers[$header] = $_SERVER[$server_name];
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}
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if (($missing = array_diff($required_headers, array_keys($headers))))
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{
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throw new Exception ('Bad Request: missing '.implode(', ', $missing).' header(s)', 400);
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}
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if (!$this->dkim_validate($headers))
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{
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throw new Exception('Bad Request: DKIM signature invalid', 400);
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}
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// check if recipient is a user
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// ToDo: multiple recipients
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if (!($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' && $method != 'REQUEST')
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{
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throw new Exception ('Bad Request: missing or unsupported method in Content-Type header', 400);
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}
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// parse iCal
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$ical = file_get_contents('php://input');
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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($ical, 'VCALENDAR', 'utf-8'))
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{
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throw new Exception('Bad Request: Failed parsing iCal', 400);
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}
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$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, $xml);
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break;
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default:
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throw new exception('Not yet implemented!');
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}
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$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 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
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* @return boolean true if signature could be validated, false otherwise
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* @todo
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*/
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public function dkim_validate(array $headers)
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{
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return isset($headers['DKIM-Signature']);
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}
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/**
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* Serve an iSchedule GET request, currently only query=capabilities
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*
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* GET /.well-known/ischedule?query=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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* <capability-set>
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* <supported-version-set>
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* <version>1.0</version>
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* </supported-version-set>
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* <supported-scheduling-message-set>
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* <comp 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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* </comp>
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* <comp name="VTODO"/>
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* <comp name="VFREEBUSY"/>
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* </supported-scheduling-message-set>
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* <supported-calendar-data-type>
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* <calendar-data-type content-type="text/calendar" version="2.0"/>
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* </supported-calendar-data-type>
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* <supported-attachment-values>
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* <inline-attachment/>
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* <external-attachment/>
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* </supported-attachment-values>
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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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* </capability-set>
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* </query-result>
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*/
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protected function get()
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{
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if (!isset($_GET['query']) || $_GET['query'] !== 'capabilities')
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{
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error_log(__METHOD__."() invalid iSchedule request using GET without query=capabilities!");
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header("HTTP/1.1 400 Bad Request");
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return;
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}
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// generate capabilities
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/*$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, 'query-result', self::ISCHEDULE);
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$xml->startElement('capability-set');
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foreach(array(
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'supported-version-set' => array('version' => array('1.0')),
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'supported-scheduling-message-set' => array(
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'comp' => array('.name' => array(
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'VEVENT' => array('method' => array('REQUEST', 'ADD', 'REPLY', 'CANCEL')),
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'VTODO' => '',
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'VFREEBUSY' => '',
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)),
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)
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) as $name => $data)
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{
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$xml->writeElement($name, $data);
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}
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$xml->endElement(); // capability-set
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$xml->endElement(); // query-result
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$xml->endDocument();
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$capabilities = $xml->outputMemory();*/
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$capabilities = '<?xml version="1.0" encoding="utf-8" ?>
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<query-result xmlns="urn:ietf:params:xml:ns:ischedule">
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<capability-set>
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<supported-version-set>
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<version>1.0</version>
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</supported-version-set>
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<supported-scheduling-message-set>
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<comp 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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</comp>
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<comp name="VTODO"/>
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<comp name="VFREEBUSY"/>
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</supported-scheduling-message-set>
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<supported-calendar-data-type>
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<calendar-data-type content-type="text/calendar" version="2.0"/>
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</supported-calendar-data-type>
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<supported-attachment-values>
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<inline-attachment/>
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<external-attachment/>
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</supported-attachment-values>
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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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</capability-set>
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</query-result>';
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// returning capabilities
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header('Content-Type: application/xml; charset=utf-8');
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header('iSchedule-Version: '.self::VERSION);
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header('Content-Length: '.bytes($capabilites));
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header('ETag: "'.md5($capabilites).'"');
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echo $capabilities;
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common::egw_exit();
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}
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/**
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* Exception handler, which additionally logs the request (incl. a trace)
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*
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* Does NOT return and get installed in constructor.
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*
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* @param Exception $e
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*/
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public static function exception_handler(Exception $e)
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{
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// logging exception as regular egw_execption_hander does
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_egw_log_exception($e,$headline);
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// exception handler sending message back to the client as http status
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$code = $e->getCode();
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$msg = $e->getMessage();
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if (!in_array($code, array(400, 403, 407, 503))) $code = 500;
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header('HTTP/1.1 '.$code.' '.$msg);
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// if our groupdav logging is active, log the request plus a trace, if enabled in server-config
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/*if (groupdav::$request_starttime && isset($GLOBALS['groupdav']) && is_a($GLOBALS['groupdav'],'groupdav'))
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{
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$GLOBALS['groupdav']->_http_status = '401 Unauthorized'; // to correctly log it
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if ($GLOBALS['egw_info']['server']['exception_show_trace'])
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{
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$GLOBALS['groupdav']->log_request("\n".$e->getTraceAsString()."\n");
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}
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else
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{
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$GLOBALS['groupdav']->log_request();
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}
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}*/
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if (is_object($GLOBALS['egw']))
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{
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common::egw_exit();
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}
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exit;
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}
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}
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