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egroupware/icalsrv.php

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<?php
/* WARNING: EXPERIMENTAL CODE DO NOT USE FOR PRODUCTION */
/**
* @file
* IcalsrvNG: Export and Import Egw events and task as ICalendar over http using
* Virtual Calendars
*
* Possible clients include Mozilla Calendar/Sunbird, Korganizer, Apple Ical
* and Evolution.
* @note <b> THIS IS STILL EXPERIMENTAL CODE </b> do not use in production.
* @note this script is supposed to be at: egw-root/icalsrv.php
*
* NEW RalfBecker Aug 2007
* many modifications to improve the support of (at least) lightning
* - changed default uid handling to UID2UID (means keep them unchanged), as the other
* modes created doublicates on client and server, as the client did not understand
* that the server changes his uid's (against the RFC specs).
* - ability to delete events (not yet InfoLogs!), by tracking the id's of the GET request
* of the client and deleting the ones NOT send back to the server in PUT requests
* - added etag handling to allow to reject put requests if the calendar is not up to date
* (HTTP_IF header with etag in client PUT requests) and to report unmodified calendars
* to the client (HTTP_IF_NONE_MATCH header with etag gets 304 Not modified response)
* - returning 501 Not implemented response, for WebDAV/CalDAV request (eg. PROPFIND), to
* let the client know we dont support it
* - ability to use contacts identified by their mail address as participants (mail addresses
* which are no contacts still get written to the description!)
* - support uid for InfoLog (requires InfoLog version >= 1.5)
* @version 0.9.37-ng-a2 added a todo plan for v0.9.40
* @date 20060510
* @since 0.9.37-ng-a1 removed fixed default domain authentication
* @since 0.9.36-ng-a1 first version for NAPI-3.1 (write in non owner rscs)
* @author Jan van Lieshout <jvl (at) xs4all.nl> Rewrite and extension for egw 1.2.
* (see: @url http://www.egroupware.org )
* $Id$
* Based on some code from:
* @author RalfBecker@outdoor-training.de (some original code base)
*
* <b>license:</b><br>
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* @todo make this 'ical-service' enabled/disabled from the egw
* admin interface
* @todo make the definition of virtual calendars possible from a 'ical-service' web
* user interface user
* @todo (for 0.9.40 versions) move much parsing of the vc to class.vcsrv.inc.php
* and add the $vcpath var where pathinfo is parsed to communicate to vc_X class
* @bug if you dont have enough privilages to access a personal calendar of someone
* icalsrv will not give you an access denied error, but will just return no events
* from this calendar. (Needed otherwise you cannot collect events from multiple resources
* into a single virtual calendar.
*
* @todo make code robust against xss attacke etc.
*/
//-------- basic operation configuration variables ----------
$logdir = False; // set to false for no logging
#$logdir = '/tmp'; // set to a valid (writable) directory to get log file generation
// set to true for debug logging to errorlog
//$isdebug = True;
$isdebug = False;
/** Disallow users to import in non owned calendars and infologs
* @var boolean $disable_nonowner_import
*/
$disable_nonowner_import = false;
// icalsrv variant with session setup modeled after xmlrpc.php
//die(print_r($_COOKIE, true));
$icalsrv = array();
$GLOBALS['egw_info'] = array();
$GLOBALS['egw_info']['flags'] = array(
'currentapp' => 'login',
'noheader' => True,
'nonavbar' => True,
'disable_Template_class' => True
);
include('header.inc.php');
$ical_login = split('\@',$_SERVER['PHP_AUTH_USER']);
if($ical_login[1])
{
$ical_user = $ical_login[0];
$domain = $ical_login[1];
unset($ical_login);
}
else
{
$ical_user = $_SERVER['PHP_AUTH_USER'];
$domain = get_var('domain',array('COOKIE','GET'));
}
$sessionid = get_var('sessionid',array('COOKIE','GET'));
$kp3 = get_var('kp3',array('COOKIE','GET'));
$domain = $domain ? $domain : $GLOBALS['egw_info']['server']['default_domain'];
$icalsrv['session_ok'] = $GLOBALS['egw']->session->verify($sessionid,$kp3);
if($icalsrv['session_ok'])
{
$icalsrv['authed'] = True;
}
if(!$icalsrv['session_ok'] && isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW']))
{
$icalsrv['authed'] = $GLOBALS['egw']->session->create($ical_user . '@' . $domain, $_SERVER['PHP_AUTH_PW'], 'text');
}
if($icalsrv['authed'])
{
$icalsrv['session_ok'] = True;
// This may not even be necessary:
$GLOBALS['egw_info']['flags']['currentapp'] = 'icalsrv';
}
// bad session or bad authentication so please re-authenticate..
if(!($icalsrv['session_ok'] && $icalsrv['authed']))
{
if($isdebug)
{
error_log('line ' . __LINE__ . ': Session: '. $icalsrv['session_ok'] . ', Authed: ' . $icalsrv['authed']);
}
header('WWW-Authenticate: Basic realm="ICal Server"');
header('HTTP/1.1 401 Unauthorized');
exit;
}
/* Moved after the auth header send. It is normal to save this check until now, similar to how simple eGroupWare access control works for a browser login. (Milosch) */
if(!@isset($GLOBALS['egw_info']['user']['apps']['icalsrv']))
{
fail_exit('IcalSRV not enabled','403');
}
// Ok! We have a session and access to icalsrv!
// now set the variables that will control the working mode of icalvircal
// the defines are in the icalsrv_resourcehandler sourcefile
require_once EGW_SERVER_ROOT. '/icalsrv/inc/class.icalsrv_resourcehandler.inc.php' ;
/** uid mapping export configuration switch
* @var int
* Parameter that determines, a the time of export from Egw (aka dowload by client), how
* ical elements (like VEVENT's) get their uid fields filled, from data in
* the related Egroupware element.
* See further in @ref secuidmapping in the icalsrv_resourcehandler documentation.
*/
// New RalfBecker Aug 2007
// NOT using UID2UID creates doublicates on the iCal client, as it does NOT understand,
// that posted events get their uid changed by the server.
// I think uid's should be handled as specified in the RFC: the first clients assigns them
// AND noone is supposted to change them after that!
$uid_export_mode = UMM_UID2UID;
/** uid mapping import configuration switch
* @var int
* Parameter that determines, at the time of import into Egw (aka publish by client), how
* ical elements (like VEVENT's) will find, based on their uid fields, related egw
* elements, that are then updated with the ical info.
* See further in @ref secuidmapping in the icalsrv_resourcehandler documentation.
*/
// New RalfBecker Aug 2007
// NOT using UID2UID creates doublicates on the iCal client, see above
$uid_import_mode = UMM_UID2UID;
/**
* @section secisuidmapping Basic Possible settings of UID to ID mapping.
*
* @warning the default setting in icalsrv.php is one of the 3 basic uid mapping modes:
* #The standard mode that allows a published client calendar to add new events and todos
* to the egw calendar, and allows to update already before published (to egw) and
* at least once downloaded (from egw) events and todos.
* .
* setting: <PRE>$uid_export_mode = UMM_ID2UID; $uid_import_mode = UMM_UID2ID; </PRE> (default)
* #The fool proof mode that will prevent accidental change or deletion of existing
* egw events or todos. Note that the price to pay is <i>duplication</i> on republishing or
* re-download!
* .
* setting: <PRE>$uid_export_mode = UMM_NEWUID; $uid_import_mode = UMM_NEWID; </PRE> (discouraged)
* #The flaky sync mode that in principle would make each event and todo recognizable by
* both the client and egw at each moment. In this mode a once given uid field is both used
* in the client and in egw. Unfortunately there are quite some problems with this, making it
* very unreliable to use!
* .
* setting: <PRE>$uid_export_mode = UMM_UID2UID; $uid_import_mode = UMM_UID2UID; </PRE> (discouraged!)
*/
/** allow elements gone(deleted) in egw to be imported again from client
* @var boolean $reimport_missing_elements
*/
$reimport_missing_elements = true;
//-------- end of basic operation configuration variables ----------
#error_log('_SERVER:' . print_r($_SERVER, true));
// go parse our request uri
$requri = $_SERVER['REQUEST_URI'];
$reqpath= $_SERVER['PATH_INFO'];
$reqagent = $_SERVER['HTTP_USER_AGENT'];
# maybe later also do something with content_type?
# if(!empty($_SERVER['CONTENT_TYPE'])) {
# if(strpos($_SERVER['CONTENT_TYPE'], 'application/vnd....+xml') !== false) {
# ical/ics ???
// ex1: $requri='egroupware/icalsrv.php/demouser/todos.ics'
// then $reqpath='/demouser/todos.ics'
// $rvc_owner='demouser'
// $rvc_basename='/todos.ics'
// ex2:or $recuri ='egroupware/icalsrv.php/uk/holidays.ics'
// then $reqpath='/uk/holidays.ics'
// $rvc_owner = null; // unset
// $rvc_basename=null; // unset
// ex3: $requri='egroupware/icalsrv.php/demouser/todos?pw=mypw01'
// then $reqpath='/demouser/todos.ics'
// $rvc_owner='demouser'
// $rvc_basename='/todos.ics'
// $_GET['pw'] = 'mypw01'
// S-- parse the $reqpath to get $reqvircal names
unset($reqvircal_owner);
unset($reqvircal_owner_id);
unset($reqvircal_basename);
if(empty($_SERVER['PATH_INFO']))
{
// no specific calendar requested, so do default.ics
$reqvircal_pathname = '/default.ics';
// try owner + base for a personal vircal request
}
elseif(preg_match('#^/([\w.]+)(/[^<^>^?]+)$#', $_SERVER['PATH_INFO'], $matches))
{
$reqvircal_pathname = $matches[0];
$reqvircal_owner = $matches[1];
$reqvircal_basename = $matches[2];
if(!$reqvircal_owner_id = $GLOBALS['egw']->accounts->name2id($reqvircal_owner))
{
// owner is unknown, so forget about personal calendar
unset($reqvircal_owner);
unset($reqvircal_basename);
}
// check for decent non personal path
}
elseif(preg_match('#^(/[^<^>]+)$#', $_SERVER['PATH_INFO'], $matches))
{
$reqvircal_pathname = $matches[0];
// just default to standard path
}
else
{
$reqvircal_pathname = 'default.ics';
}
if($isdebug)
{
error_log('http-user-agent:' . $reqagent
. ',pathinfo:' . $reqpath . ',rvc_pathname:' . $reqvircal_pathname
. ',rvc_owner:' . $reqvircal_owner . ',rvc_owner_id:' . $reqvircal_owner_id
. ',rvc_basename:' . $reqvircal_basename);
}
// S1A search for the requested calendar in the vircal_ardb's
if(is_numeric($reqvircal_owner_id))
{
// check if the requested personal calender is provided by the owner..
/**
* @todo 1. create somehow the list of available personal vircal arstores
* note: this should be done via preferences and read repository, but how....
* I have to find out and write it...
*/
// find personal database of (array stored) virtual calendars
$cnmsg = 'calendar [' . $reqvircal_basename . '] for user [' . $reqvircal_owner . ']';
$vo_personal_vircal_ardb =& CreateObject('icalsrv.personal_vircal_ardb', $reqvircal_owner_id);
if(!(is_object($vo_personal_vircal_ardb)))
{
error_log('icalsrv.php: couldnot create personal vircal_ardb for user:' . $reqvircal_owner);
fail_exit('could not access' . $cnmsg, '403');
}
// check if a /<username>/list.html is requested
if($reqvircal_basename == '/list.html')
{
echo $vo_personal_vircal_ardb->listing(1);
$GLOBALS['egw']->common->egw_exit();
}
error_log('vo_personal_vircal_ardb:' . print_r($vo_personal_vircal_ardb->calendars, true));
// search our calendar in personal vircal database
if(!($vircal_arstore = $vo_personal_vircal_ardb->calendars[$reqvircal_basename]))
{
error_log('icalsrv.php: ' . $cnmsg . ' not found.');
fail_exit($cnmsg . ' not found.' , '404');
}
// oke we have a valid personal vircal in array_storage format!
}
else
{
// check if the requested system calender is provided by system
$cnmsg = 'system calendar [' . $reqvircal_pathname . ']';
/**
* @todo 1. create somehow the list of available system vircal
* arstores note: this should be done via preferences and read
* repository, but how.... I have to find out
*/
// find system database of (array stored) virtual calendars
$system_vircal_ardb = CreateObject('icalsrv.system_vircal_ardb');
if(!(is_object($system_vircal_ardb)))
{
error_log('icalsrv.php: couldnot create system vircal_ardb');
fail_exit('couldnot access ' . $cnmsg, '403');
}
// check if a /list.html is requested
if($reqvircal_pathname == '/list.html')
{
echo $system_vircal_ardb->listing(1);
$GLOBALS['egw']->common->egw_exit();
}
// search our calendar in system vircal database
if(!($vircal_arstore = $system_vircal_ardb->calendars[$reqvircal_pathname]))
{
fail_exit($cnmsg . ' not found', '404');
}
// oke we have a valid system vircal in array_storage format!
}
//die(print_r($_COOKIE,true). " in ". __FILE__.", line ".__LINE__);
if($isdebug)
{
error_log('vircal_arstore:' . print_r($vircal_arstore, true));
}
// build a virtual calendar with ical facilities from the found vircal
// array_storage data
require_once(EGW_INCLUDE_ROOT.'/icalsrv/inc/class.icalvircal.inc.php');
$icalvc =& new icalvircal;
if(!$icalvc->fromArray($vircal_arstore))
{
error_log('icalsrv.php: ' . $cnmsg . ' couldnot restore from repository.' );
fail_exit($cnmsg . ' internal problem ' , '403');
}
// YES: $icalvc created ok! acces rights needs to be checked though!
// HACK: ATM basic auth is always needed!! (JVL) ,so we force icalvc into it
$icalvc->auth = ':basic';
// check if the virtual calendar demands authentication
if(strpos($icalvc->auth,'none') !== false)
{
// no authentication demanded so continue
}
elseif(strpos($icalvc->auth,'basic') !== false)
{
//basic http authentication demanded
//so exit on non authenticated http request
//-- As we atm only allow authenticated users the
// actions in the next lines are already done at the begining
// of this file --
// if((!isset($_SERVER['PHP_AUTH_USER'])) ||
// (!$GLOBALS['egw']->auth->authenticate($_SERVER['PHP_AUTH_USER'],
// $_SERVER['PHP_AUTH_PW']))) {
// if($isdebug)
// error_log('SESSION IS SETUP, BUT AUTHENTICATE FAILED'.$_SERVER['PHP_AUTH_USER'] );
// header('WWW-Authenticate: Basic realm="ICal Server"');
// header('HTTP/1.1 401 Unauthorized');
// exit;
// }
// // else, use the active basic authentication to set preferences
// $user_id = $GLOBALS['egw']->accounts->name2id($_SERVER['PHP_AUTH_USER']);
// $GLOBALS['egw_info']['user']['account_id'] = $user_id;
// error_log(' ACCOUNT SETUP FOR'
// . $GLOBALS['egw_info']['user']['account_id']);
}
elseif(strpos($icalvc->auth,'ssl') !== false)
{
// ssl demanded, check if we are in https authenticated connection
// if not redirect to https
error_log('icalsrv.php:' . $cnmsg . ' demands secure connection');
fail_exit($cnmsg . ' demands secure connection: please use https', '403');
}
else
{
error_log('*** icalsrv.php:' . $cnmsg . ' requires unknown authentication method:'
. $icalcv->auth);
fail_exit($cnmsg . ' demands unavailable authentication method:'
. $icalcv->auth, '403');
}
/**
* @todo this extra password checkin should, at least for logged-in users,
* better be incorporated in the ACL checkings. At some time...
*/
// check if an extra password is needed too
if(strpos($icalvc->auth,'passw') !== false)
{
//extra parameter password authentication demanded
//so exit if pw parameter is not valid
if((!isset($_GET['password'])) ||
(!$icalvc->pw !== $_GET['password']))
{
error_log('icalsrv.php:' . $cnmsg . ' demands extra password parameter');
fail_exit($cnmsg . ' demands extra password parameter', '403');
}
}
// now we are authenticated enough
// go setup import and export mode in our ical virtual calendar
$icalvc->uid_mapping_export = $uid_export_mode;
$icalvc->uid_mapping_import = $uid_import_mode;
$icalvc->reimport_missing_elements = $reimport_missing_elements;
$logmsg = "";
// NEW RalfBecker Aug 2007
// We have to handle the request methods different, specially the WebDAV ones we dont support
switch($_SERVER['REQUEST_METHOD'])
{
case 'PUT':
// *** PUT Request so do an Import *************
if($isdebug)
{
error_log('icalsrv.php: importing, by user:' .$GLOBALS['egw_info']['user']['account_id']
. ' for virtual calendar of: ' . $reqvircal_owner_id);
}
// check if importing in not owned calendars is disabled
if($reqvircal_owner_id
&& ($GLOBALS['egw_info']['user']['account_id'] !== $reqvircal_owner_id))
{
if($disable_nonowner_import)
{
error_log('icalsrv.php: importing in non owner calendars currently disabled');
fail_exit('importing in non owner calendars currently disabled', '403');
}
}
if(isset($reqvircal_owner_id) && ($reqvircal_owner_id < 0))
{
error_log('icalsrv.php: importing in group calendars not allowed');
fail_exit('importing in groupcalendars is not allowed', '403');
}
// NEW RalfBecker Aug 2007
// for a PUT we have to check if the currently loaded calendar is still up to date
// (not changed eg. by someone else or via the webfrontend).
// This is done by comparing the ETAG given as HTTP_IF with the current ETAG (last modification date)
// of the calendar --> on failure we return 412 Precondition failed, to not overwrite the modifications
if (isset($_SERVER['HTTP_IF']) && preg_match('/\(\[([0-9]+)\]\)/',$_SERVER['HTTP_IF'],$matches))
{
$etag = $icalvc->get_etag();
//error_log("PUT: current etag=$etag, HTTP_IF=$_SERVER[HTTP_IF]");
if ($matches[1] != $etag)
{
fail_exit('Precondition Failed',412);
}
}
// I0 read the payload
$logmsg = 'IMPORTING in '. $importMode . ' mode';
$fpput = fopen("php://input", "r");
$vcalstr = "";
while($data = fread($fpput, 1024))
{
$vcalstr .= $data;
}
fclose($fpput);
// import the icaldata into the virtual calendar
// note: ProductType is auto derived from $vcalstr
$import_table =& $icalvc->import_vcal($vcalstr);
// count the successes..
if($import_table === false)
{
$msg = 'icalsrv.php: importing '. $cnmsg . ' ERRORS';
fail_exit($msg,'403');
}
else
{
$logmsg .= "\n imported " . $cnmsg . ' : ';
foreach($import_table as $rsc_class => $vids)
{
$logmsg .= "\n resource: " . $rsc_class . ' : ' . count($vids) .' elements OK';
}
}
// DONE importing
if($logdir)
{
log_ical($logmsg,"import",$vcalstr);
}
// NEW RalfBecker Aug 2007
// we have to send a new etag header, as otherwise the client (at least lightning) has a wrong etag,
// if it's not requesting the calendar again via GET
header("ETag: ". $icalvc->get_etag());
// handle response ...
$GLOBALS['egw']->common->egw_exit();
case 'GET':
// *** GET Request so do an export
$logmsg = 'EXPORTING';
// derive a ProductType from our http Agent and set it in icalvc
$icalvc->deviceType = icalsrv_resourcehandler::httpUserAgent2deviceType($reqagent);
// NEW RalfBecker Aug 2007
// if an IF_NONE_MATCH is given, check if we need to send a new export, or the current one is still up-to-date
if (isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
$etag = $icalvc->get_etag();
error_log("GET: current etag=$etag, HTTP_IF_NONE_MATCH=$_SERVER[HTTP_IF_NONE_MATCH]");
if ($_SERVER['HTTP_IF_NONE_MATCH'] == $etag)
{
fail_exit('Not Modified',304);
}
}
// export the data from the virtual calendar
$vcalstr = $icalvc->export_vcal();
// handle response
if($vcalstr === false)
{
$msg = 'icalsrv.php: exporting '. $cnmsg . ' ERRORS';
fail_exit($msg,'403');
}
else
{
$logmsg .= "\n exported " . $cnmsg ." : OK ";
}
// DONE exporting
// NEW RalfBecker Aug 2007
// returnung max modification date of events as etag header
header("ETag: ". $icalvc->export_etag);
if($logdir) log_ical($logmsg,"export",$vcalstr);
// handle response ...
// using fixed text/calendar as content-type, as deviceType2contentType always returns '', which cause php to use text/html
//$content_type = icalsrv_resourcehandler::deviceType2contentType($icalvc->deviceType);
$content_type = 'text/calendar';
if($content_type)
{
header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-store, no-cache, must-revalidate'); // HTTP/1.1
header('Cache-Control: pre-check=0, post-check=0, max-age=0'); // HTTP/1.1
header('Content-Type: '.$content_type);
}
echo $vcalstr;
$GLOBALS['egw']->common->egw_exit();
default:
case 'PROPFIND':
// tell the client we do NOT support full WebDAV/CalDAV
fail_exit('Not Implemented',501);
}
// // --- SOME UTILITY FUNCTIONS -------
/**
* Exit with an error message in html
* @param $msg string
* message that gets return as html error description
*/
function fail_exit($msg, $errno = '403')
{
// log the error in the http server error logging files
error_log('resp: ' . $errno . ' ' . $msg);
// return http error $errno can this be done this way?
header('HTTP/1.1 '. $errno . ' ' . $msg);
# header('HTTP/1.1 403 ' . $msg);
ob_flush();
flush();
$GLOBALS['egw']->common->egw_exit();
}
/*
* Log info and data to logfiles if logging is set
*
* @param $msg string with loginfo
* @param $data data to be logged
* @param $icalmethod $string value can be import or export
* @global $logdir string/boolean log directory. Set to false to disab logging
*/
function log_ical($msg,$icalmethod="data",$data)
{
global $logdir;
if(!$logdir) return; // loggin seems off
// some info used for logging
$logstamp = date("U");
$loguser = $_SERVER['PHP_AUTH_USER'];
$logdate = date("Ymd:His");
// filename for log info, only used when logging is on
$fnloginfo = "$logdir/ical.log";
// log info
$fnlogdata = $logdir . "/ical." . $icalmethod . '.' . $logstamp . ".ics";
$fp = fopen("$fnloginfo",'a+');
fwrite($fp,"\n\n$loguser on $logdate : $msg, \n data in $fnlogdata ");
fclose($fp);
// log data
$fp = fopen("$fnlogdata", "w");
fputs($fp, $data);
fclose($fp);
}
?>
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