forked from extern/egroupware
546 lines
17 KiB
PHP
546 lines
17 KiB
PHP
<?php
|
|
/**
|
|
* EGroupware: iSchedule server
|
|
*
|
|
* @link http://www.egroupware.org
|
|
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
|
|
* @package api
|
|
* @subpackage groupdav
|
|
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
|
|
* @copyright (c) 2012 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
|
|
* @version $Id$
|
|
*/
|
|
|
|
/**
|
|
* iSchedule server: serverside of iSchedule
|
|
*
|
|
* @link https://tools.ietf.org/html/draft-desruisseaux-ischedule-01 iSchedule draft from 2010
|
|
*/
|
|
class ischedule_server
|
|
{
|
|
/**
|
|
* iSchedule xml namespace
|
|
*/
|
|
const ISCHEDULE = 'urn:ietf:params:xml:ns:ischedule';
|
|
|
|
/**
|
|
* Own iSchedule version
|
|
*/
|
|
const VERSION = '1.0';
|
|
|
|
/**
|
|
* Serve an iSchedule request
|
|
*/
|
|
public function ServeRequest()
|
|
{
|
|
// install our own exception handler sending exceptions as http status
|
|
set_exception_handler(array(__CLASS__, 'exception_handler'));
|
|
|
|
switch($_SERVER['REQUEST_METHOD'])
|
|
{
|
|
case 'GET':
|
|
$this->get();
|
|
break;
|
|
|
|
case 'POST':
|
|
$this->post();
|
|
break;
|
|
|
|
default:
|
|
error_log(__METHOD__."() invalid iSchedule request using {$_SERVER['REQUEST_METHOD']}!");
|
|
header("HTTP/1.1 400 Bad Request");
|
|
}
|
|
}
|
|
|
|
static $supported_components = array('VEVENT', 'VFREEBUSY', 'VTODO');
|
|
/**
|
|
* Requiremnt for originator to match depending on method
|
|
*
|
|
* @var array method => array('ORGANIZER','ATTENDEE')
|
|
* @link https://tools.ietf.org/html/draft-desruisseaux-ischedule-01#section-6.1
|
|
*/
|
|
static $supported_method2origin_requirement = array(
|
|
//'PUBLISH' => null, // no requirement
|
|
'REQUEST' => array('ORGANIZER', 'ATTENDEE'),
|
|
'REPLY' => array('ATTENDEE'),
|
|
'ADD' => array('ORGANIZER'),
|
|
'CANCEL' => array('ORGANIZER'),
|
|
//'REFRESH' => null,
|
|
//'COUNTER' => array('ATTENDEE'),
|
|
//'DECLINECOUNTER' => array('ORGANIZER'),
|
|
);
|
|
|
|
/**
|
|
* Serve an iSchedule POST request
|
|
*/
|
|
protected function post()
|
|
{
|
|
// get and verify required headers
|
|
static $required_headers = array('Host','Recipient','Originator','Content-Type','DKIM-Signature');
|
|
$headers = array();
|
|
foreach($required_headers as $header)
|
|
{
|
|
$server_name = strtoupper(str_replace('-', '_', $header));
|
|
if (strpos($server_name, 'CONTENT_') !== 0) $server_name = 'HTTP_'.$server_name;
|
|
if (!empty($_SERVER[$server_name])) $headers[$header] = $_SERVER[$server_name];
|
|
}
|
|
if (($missing = array_diff(array_keys($headers), $required_headers)))
|
|
{
|
|
throw new Exception ('Bad Request: missing '.implode(', ', $missing).' header(s)', 400);
|
|
}
|
|
|
|
// get raw request body
|
|
$ical = file_get_contents('php://input');
|
|
|
|
// validate dkim signature
|
|
if (!self::dkim_validate($headers, $ical, $error))
|
|
{
|
|
throw new Exception('Bad Request: DKIM signature invalid: '.$error, 400);
|
|
}
|
|
// check if recipient is a user
|
|
// ToDo: multiple recipients
|
|
if (!($account_id = $GLOBALS['egw']->accounts->name2id($headers['Recipient'], 'account_email')))
|
|
{
|
|
throw new Exception('Bad Request: unknown recipient', 400);
|
|
}
|
|
// create enviroment for recipient user, as we act on his behalf
|
|
$GLOBALS['egw']->session->account_id = $account_id;
|
|
$GLOBALS['egw']->session->account_lid = $GLOBALS['egw']->accounts->id2name($account_id);
|
|
//$GLOBALS['egw']->session->account_domain = $domain;
|
|
$GLOBALS['egw_info']['user'] = $GLOBALS['egw']->session->read_repositories();
|
|
translation::init();
|
|
|
|
// check originator is allowed to iSchedule with recipient
|
|
// ToDo: preference for user/admin to specify with whom to iSchedule: $allowed_origins
|
|
$allowed_origins = preg_split('/, ?/', $GLOBALS['egw_info']['user']['groupdav']['ischedule_allowed_origins']);
|
|
/* disabled 'til UI is ready to specifiy
|
|
list(,$originator_domain) = explode('@', $headers['Originator']);
|
|
if (!in_array($headers['Originator'], $allowed_orgins) && !in_array($originator_domain, $allowed_origins))
|
|
{
|
|
throw new Exception('Forbidden', 403);
|
|
}*/
|
|
|
|
// check method and component of Content-Type are valid
|
|
if (!preg_match('/component=([^;]+)/i', $headers['Content-Type'], $matches) ||
|
|
(!in_array($component=strtoupper($matches[1]), self::$supported_components)))
|
|
{
|
|
throw new Exception ('Bad Request: missing or unsupported component in Content-Type header', 400);
|
|
}
|
|
if (!preg_match('/method=([^;]+)/i', $headers['Content-Type'], $matches) ||
|
|
(!isset(self::$supported_method2origin_requirement[$method=strtoupper($matches[1])])) ||
|
|
$component == 'VFREEBUSY' && $method != 'REQUEST')
|
|
{
|
|
throw new Exception ('Bad Request: missing or unsupported method in Content-Type header', 400);
|
|
}
|
|
// parse iCal
|
|
// code copied from calendar_groupdav::outbox_freebusy_request for now
|
|
include_once EGW_SERVER_ROOT.'/phpgwapi/inc/horde/lib/core.php';
|
|
$vcal = new Horde_iCalendar();
|
|
if (!$vcal->parsevCalendar($ical, 'VCALENDAR', 'utf-8'))
|
|
{
|
|
throw new Exception('Bad Request: Failed parsing iCal', 400);
|
|
}
|
|
$version = $vcal->getAttribute('VERSION');
|
|
$handler = new calendar_ical();
|
|
$handler->setSupportedFields('GroupDAV',$this->agent);
|
|
$handler->calendarOwner = $handler->user = 0; // to NOT default owner/organizer to something
|
|
if (!($vcal_comp = $vcal->getComponent(0)) ||
|
|
!($event = $handler->vevent2egw($vcal_comp, $version, $handler->supportedFields,
|
|
$principalURL='', $check_component='Horde_iCalendar_'.strtolower($component))))
|
|
{
|
|
throw new Exception('Bad Request: Failed converting iCal', 400);
|
|
}
|
|
|
|
// validate originator matches organizer or attendee
|
|
$originator_requirement = self::$supported_method2origin_requirement[$method];
|
|
if (isset($originator_requirement))
|
|
{
|
|
$matches = false;
|
|
foreach($originator_requirement as $requirement)
|
|
{
|
|
if ($requirement == 'ORGANIZER' &&
|
|
($event['organizer'] == $headers['Originator'] || strpos($event['organizer'], '<'.$headers['Originator'].'>') !== false) ||
|
|
$requirement == 'ATTENDEE' &&
|
|
(in_array('e'.$headers['Originator'], $event['participants']) ||
|
|
// ToDO: Participant could have CN, need to check that too
|
|
$originator_account_id = $GLOBALS['egw']->accounts->name2id($headers['Originator'], 'account_email') &&
|
|
in_array($originator_account_id, $event['participants'])))
|
|
{
|
|
$matches = true;
|
|
break; // no need to try further as we OR
|
|
}
|
|
}
|
|
if (!$matches)
|
|
{
|
|
throw new Exception('Bad Request: originator invalid for given '.$component.'!', 400);
|
|
}
|
|
}
|
|
|
|
$xml = new XMLWriter;
|
|
$xml->openMemory();
|
|
$xml->setIndent(true);
|
|
$xml->startDocument('1.0', 'UTF-8');
|
|
$xml->startElementNs(null, 'schedule-response', self::ISCHEDULE); // null = no prefix
|
|
|
|
switch($component)
|
|
{
|
|
case 'VFREEBUSY':
|
|
$this->vfreebusy($event, $handler, $vcal_comp, $xml);
|
|
break;
|
|
|
|
case 'VEVENT':
|
|
$this->vevent($event, $handler, $component, $xml);
|
|
break;
|
|
|
|
default:
|
|
throw new exception('Not yet implemented!');
|
|
}
|
|
|
|
$xml->endElement(); // schedule-response
|
|
$xml->endDocument();
|
|
|
|
header('Content-type: text/xml; charset=UTF-8');
|
|
header('iSchedule-Version: '.self::VERSION);
|
|
|
|
echo $xml->outputMemory();
|
|
}
|
|
|
|
/**
|
|
* Handle VEVENT component
|
|
*
|
|
* @param array $event
|
|
* @param calendar_ical $handler
|
|
* @param string $ical
|
|
* @param XMLWriter $xml
|
|
*/
|
|
function vevent(array $event, calendar_ical $handler, Horde_iCalendar_vevent $component, XMLWriter $xml)
|
|
{
|
|
$organizer = $component->getAttribute('ORGANIZER');
|
|
$attendees = (array)$component->getAttribute('ATTENDEE');
|
|
|
|
$handler->importVCal($vCalendar, $eventId,
|
|
self::etag2value($this->http_if_match), false, 0, $this->groupdav->current_user_principal, $user, $charset, $id);
|
|
|
|
foreach($event['participants'] as $uid => $status)
|
|
{
|
|
$xml->startElement('response');
|
|
|
|
$xml->writeElement('recipient', $attendee=array_shift($attendees)); // iSchedule has not DAV:href!
|
|
|
|
if (is_numeric($uid))
|
|
{
|
|
$xml->writeElement('request-status', '2.0;Success');
|
|
$xml->writeElement('responsedescription', 'Delivered to recipient');
|
|
}
|
|
else
|
|
{
|
|
$xml->writeElement('request-status', '3.7;Invalid Calendar User');
|
|
$xml->writeElement('responsedescription', 'Recipient not a local user');
|
|
}
|
|
$xml->endElement(); // response
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handle VFREEBUSY component
|
|
*
|
|
* @param array $event
|
|
* @param calendar_ical $handler
|
|
* @param Horde_iCalendar_vfreebusy $component
|
|
* @param XMLWriter $xml
|
|
*/
|
|
function vfreebusy(array $event, calendar_ical $handler, Horde_iCalendar_vfreebusy $component, XMLWriter $xml)
|
|
{
|
|
$organizer = $component->getAttribute('ORGANIZER');
|
|
$attendees = (array)$component->getAttribute('ATTENDEE');
|
|
|
|
foreach($event['participants'] as $uid => $status)
|
|
{
|
|
$xml->startElement('response');
|
|
|
|
$xml->writeElement('recipient', $attendee=array_shift($attendees)); // iSchedule has not DAV:href!
|
|
|
|
if (is_numeric($uid))
|
|
{
|
|
$xml->writeElement('request-status', '2.0;Success');
|
|
$xml->writeElement('calendar-data',
|
|
$handler->freebusy($uid, $event['end'], true, 'utf-8', $event['start'], 'REPLY', array(
|
|
'UID' => $event['uid'],
|
|
'ORGANIZER' => $organizer,
|
|
'ATTENDEE' => $attendee,
|
|
)));
|
|
}
|
|
else
|
|
{
|
|
$xml->writeElement('request-status', '3.7;Invalid Calendar User');
|
|
}
|
|
$xml->endElement(); // response
|
|
}
|
|
}
|
|
|
|
const DKIM_HEADERS = 'content-type:host:originator:recipient';
|
|
|
|
/**
|
|
* Validate DKIM signature
|
|
*
|
|
* @param array $headers
|
|
* @param string $body
|
|
* @param string &$error=null error if false returned
|
|
* @return boolean true if signature could be validated, false otherwise
|
|
* @todo
|
|
*/
|
|
public static function dkim_validate(array $headers, $body, &$error=null, $verify_headers='Content-Type:Host:Originator:Recipient')
|
|
{
|
|
// parse dkim siginature
|
|
if (!isset($headers['DKIM-Signature']) ||
|
|
!preg_match_all('/[\t\s]*([a-z]+)=([^;]+);?/i', $headers['DKIM-Signature'], $matches))
|
|
{
|
|
$error = "Can't parse DKIM signature";
|
|
return false;
|
|
}
|
|
$dkim = array_combine($matches[1], $matches[2]);
|
|
|
|
if (array_diff(explode(':', $dkim['h']), explode(':', strtolower($verify_headers))))
|
|
{
|
|
$error = "Missing required headers h=$dkim[h]";
|
|
return false;
|
|
}
|
|
|
|
// fetch public key
|
|
if (!($dns = self::fetch_dns($dkim['d'], $dkim['s'])))
|
|
{
|
|
$error = "No public key for d='$dkim[d]' and s='$dkim[s]'";
|
|
return false;
|
|
}
|
|
$public_key = "-----BEGIN PUBLIC KEY-----\n".chunk_split($dns['p'], 64, "\n")."-----END PUBLIC KEY-----\n";
|
|
|
|
// create headers array
|
|
$dkim_headers = array();
|
|
foreach(explode(':', $verify_headers) as $header)
|
|
{
|
|
$dkim_headers[] = $header.': '.$headers[$header];
|
|
}
|
|
list($dkim_unsigned) = explode('b=', 'DKIM-Signature: '.$headers['DKIM-Signature']);
|
|
$dkim_unsigned .= 'b=';
|
|
|
|
// Canonicalization Header Data
|
|
require_once EGW_API_INC.'/php-mail-domain-signer/lib/class.mailDomainSigner.php';
|
|
$_unsigned = mailDomainSigner::headRelaxCanon(implode("\r\n", $dkim_headers). "\r\n".$dkim_unsigned);
|
|
|
|
$ok = openssl_verify($_unsigned, base64_decode($dkim['b']), $public_key);
|
|
|
|
switch($ok)
|
|
{
|
|
case -1:
|
|
$error = 'Error while verifying DKIM';
|
|
return false;
|
|
|
|
case 0:
|
|
$error = 'DKIM signature does NOT verify';
|
|
error_log(__METHOD__."() unsigned='$_unsigned' $error");
|
|
return false;
|
|
}
|
|
|
|
// Relax Canonicalization for Body
|
|
$_b = mailDomainSigner::bodyRelaxCanon($body);
|
|
// Hash of the canonicalized body [tag:bh]
|
|
$_bh= base64_encode(sha1($_b,true));
|
|
|
|
// check body hash
|
|
if ($_bh != $dkim['bh'])
|
|
{
|
|
$error = 'Body hash does NOT verify';
|
|
error_log(__METHOD__."() body-hash='$_bh' != '$dkim[bh]'=dkim-bh $error");
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Fetch dns record and return parsed array
|
|
*
|
|
* @param string $domain
|
|
* @param string $selector
|
|
* @return array with values for keys parsed from eg. "v=DKIM1\;k=rsa\;h=sha1\;s=calendar\;t=s\;p=..."
|
|
*/
|
|
public static function fetch_dns($domain, $selector='calendar')
|
|
{
|
|
if (!($records = dns_get_record($host=$selector.'._domainkey.'.$domain, DNS_TXT))) return false;
|
|
|
|
if (!isset($records[0]['text']) &&
|
|
!preg_match_all('/[\t\s]*([a-z]+)=([^;]+);?/i', $records[0]['txt'], $matches))
|
|
{
|
|
return false;
|
|
}
|
|
return array_combine($matches[1], $matches[2]);
|
|
}
|
|
|
|
/**
|
|
* Serve an iSchedule GET request, currently only action=capabilities
|
|
*
|
|
* GET /.well-known/ischedule?action=capabilities HTTP/1.1
|
|
* Host: cal.example.com
|
|
*
|
|
* HTTP/1.1 200 OK
|
|
* Date: Mon, 15 Dec 2008 09:32:12 GMT
|
|
* Content-Type: application/xml; charset=utf-8
|
|
* Content-Length: xxxx
|
|
* iSchedule-Version: 1.0
|
|
* ETag: "afasdf-132afds"
|
|
*
|
|
* <?xml version="1.0" encoding="utf-8" ?>
|
|
* <query-result xmlns="urn:ietf:params:xml:ns:ischedule">
|
|
* <capabilities>
|
|
* <versions>
|
|
* <version>1.0</version>
|
|
* </versions>
|
|
* <scheduling-messages>
|
|
* <component name="VEVENT">
|
|
* <method name="REQUEST"/>
|
|
* <method name="ADD"/>
|
|
* <method name="REPLY"/>
|
|
* <method name="CANCEL"/>
|
|
* </component>
|
|
* <component name="VTODO"/>
|
|
* <component name="VFREEBUSY"/>
|
|
* </scheduling-messages>
|
|
* <calendar-data-types>
|
|
* <calendar-data-type content-type="text/calendar" version="2.0"/>
|
|
* </calendar-data-types>
|
|
* <attachmens>
|
|
* <inline/>
|
|
* <external/>
|
|
* </attachments>
|
|
* <supported-recipient-uri-scheme-set>
|
|
* <scheme>mailto</scheme>
|
|
* </supported-recipient-uri-scheme-set>
|
|
* <max-content-length>102400</max-content-length>
|
|
* <min-date-time>19910101T000000Z</min-date-time>
|
|
* <max-date-time>20381231T000000Z</max-date-time>
|
|
* <max-instances>150</max-instances>
|
|
* <max-recipients>250</max-recipients>
|
|
* <administrator>mailto:ischedule-admin@example.com</administrator>
|
|
* </capabilities>
|
|
* </query-result>
|
|
*/
|
|
protected function get()
|
|
{
|
|
if (!isset($_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($GLOBALS['groupdav']) && is_a($GLOBALS['groupdav'],'groupdav'))
|
|
{
|
|
$GLOBALS['groupdav']->_http_status = '401 Unauthorized'; // to correctly log it
|
|
if ($GLOBALS['egw_info']['server']['exception_show_trace'])
|
|
{
|
|
$GLOBALS['groupdav']->log_request("\n".$e->getTraceAsString()."\n");
|
|
}
|
|
else
|
|
{
|
|
$GLOBALS['groupdav']->log_request();
|
|
}
|
|
}*/
|
|
if (is_object($GLOBALS['egw']))
|
|
{
|
|
common::egw_exit();
|
|
}
|
|
exit;
|
|
}
|
|
}
|