mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-12-25 08:09:02 +01:00
262 lines
7.8 KiB
PHP
262 lines
7.8 KiB
PHP
<?php
|
|
/**
|
|
* eGroupWare: GroupDAV access: abstract baseclass for groupdav/caldav/carddav handlers
|
|
*
|
|
* @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) 2007/8 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
|
|
* @version $Id$
|
|
*/
|
|
|
|
/**
|
|
* eGroupWare: GroupDAV access: abstract baseclass for groupdav/caldav/carddav handlers
|
|
*/
|
|
abstract class groupdav_handler
|
|
{
|
|
/**
|
|
* Debug level: 0 = nothing, 1 = function calls, 2 = more info, eg. complete $_SERVER array
|
|
*
|
|
* The debug messages are send to the apache error_log
|
|
*
|
|
* @var integer
|
|
*/
|
|
var $debug = 0;
|
|
|
|
/**
|
|
* eGW's charset
|
|
*
|
|
* @var string
|
|
*/
|
|
var $egw_charset;
|
|
/**
|
|
* Reference to the translation class
|
|
*
|
|
* @var translation
|
|
*/
|
|
var $translation;
|
|
/**
|
|
* Translates method names into ACL bits
|
|
*
|
|
* @var array
|
|
*/
|
|
var $method2acl = array(
|
|
'GET' => EGW_ACL_READ,
|
|
'PUT' => EGW_ACL_EDIT,
|
|
'DELETE' => EGW_ACL_DELETE,
|
|
);
|
|
/**
|
|
* eGW application responsible for the handler
|
|
*
|
|
* @var string
|
|
*/
|
|
var $app;
|
|
/**
|
|
* Base url of handler, need to prefix all pathes not automatic handled by HTTP_WebDAV_Server
|
|
*
|
|
* @var string
|
|
*/
|
|
var $base_uri;
|
|
/**
|
|
* HTTP_IF_MATCH / etag of current request / last call to _common_get_put_delete() method
|
|
*
|
|
* @var string
|
|
*/
|
|
var $http_if_match;
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* @param string $app 'calendar', 'addressbook' or 'infolog'
|
|
* @param int $debug=null debug-level to set
|
|
* @param string $base_uri=null base url of handler
|
|
*/
|
|
function __construct($app,$debug=null,$base_uri=null)
|
|
{
|
|
$this->app = $app;
|
|
if (!is_null($debug)) $this->debug = $debug;
|
|
$this->base_uri = is_null($base_uri) ? $base_uri : $_SERVER['SCRIPT_NAME'];
|
|
|
|
$this->translation =& $GLOBALS['egw']->translation;
|
|
$this->egw_charset = $this->translation->charset();
|
|
}
|
|
|
|
/**
|
|
* Handle propfind request for an application folder
|
|
*
|
|
* @param string $path
|
|
* @param array $options
|
|
* @param array &$files
|
|
* @param int $user account_id
|
|
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
|
|
*/
|
|
abstract function propfind($path,$options,&$files,$user);
|
|
|
|
/**
|
|
* Handle get request for an applications entry
|
|
*
|
|
* @param array &$options
|
|
* @param int $id
|
|
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
|
|
*/
|
|
abstract function get(&$options,$id);
|
|
|
|
/**
|
|
* Handle get request for an applications entry
|
|
*
|
|
* @param array &$options
|
|
* @param int $id
|
|
* @param int $user=null account_id of owner, default null
|
|
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
|
|
*/
|
|
abstract function put(&$options,$id,$user=null);
|
|
|
|
/**
|
|
* Handle get request for an applications entry
|
|
*
|
|
* @param array &$options
|
|
* @param int $id
|
|
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
|
|
*/
|
|
abstract function delete(&$options,$id);
|
|
|
|
/**
|
|
* Read an entry
|
|
*
|
|
* @param string/int $id
|
|
* @return array/boolean array with entry, false if no read rights, null if $id does not exist
|
|
*/
|
|
abstract function read($id);
|
|
|
|
/**
|
|
* Check if user has the neccessary rights on an entry
|
|
*
|
|
* @param int $acl EGW_ACL_READ, EGW_ACL_EDIT or EGW_ACL_DELETE
|
|
* @param array/int $entry entry-array or id
|
|
* @return boolean null if entry does not exist, false if no access, true if access permitted
|
|
*/
|
|
abstract function check_access($acl,$entry);
|
|
|
|
/**
|
|
* Add extra properties for collections
|
|
*
|
|
* @param array $props=array() regular props by the groupdav handler
|
|
* @return array
|
|
*/
|
|
static function extra_properties(array $props=array())
|
|
{
|
|
return $props;
|
|
}
|
|
|
|
/**
|
|
* Get the etag for an entry, can be reimplemented for other algorithm or field names
|
|
*
|
|
* @param array/int $event array with event or cal_id
|
|
* @return string/boolean string with etag or false
|
|
*/
|
|
function get_etag($entry)
|
|
{
|
|
if (!is_array($entry))
|
|
{
|
|
$entry = $this->read($entry);
|
|
}
|
|
if (!is_array($entry) || !isset($entry['id']) || !(isset($entry['modified']) || isset($entry['etag'])))
|
|
{
|
|
error_log(__METHOD__."(".array2string($entry).") Cant create etag!");
|
|
return false;
|
|
}
|
|
return '"'.$entry['id'].':'.(isset($entry['etag']) ? $entry['etag'] : $entry['modified']).'"';
|
|
}
|
|
|
|
/**
|
|
* Convert etag to the raw etag column value (without quotes, double colon and id)
|
|
*
|
|
* @param string $etag
|
|
* @return int
|
|
*/
|
|
static function etag2value($etag)
|
|
{
|
|
list(,$val) = explode(':',substr($etag,1,-1),2);
|
|
|
|
return $val;
|
|
}
|
|
|
|
/**
|
|
* Handle common stuff for get, put and delete requests:
|
|
* - application rights
|
|
* - entry level acl, incl. edit and delete rights
|
|
* - etag handling for precondition failed and not modified
|
|
*
|
|
* @param string $method GET, PUT, DELETE
|
|
* @param array &$options
|
|
* @param int $id
|
|
* @param boolean &$return_no_access=false if set to true on call, instead of '403 Forbidden' the entry is returned and $return_no_access===false
|
|
* @return array/string entry on success, string with http-error-code on failure, null for PUT on an unknown id
|
|
*/
|
|
function _common_get_put_delete($method,&$options,$id,&$return_no_access=false)
|
|
{
|
|
if (!in_array($this->app,array('principals','groups')) && !$GLOBALS['egw_info']['user']['apps'][$this->app])
|
|
{
|
|
if ($this->debug) error_log(__METHOD__."($method,,$id) 403 Forbidden: no app rights for '$this->app'");
|
|
return '403 Forbidden'; // no app rights
|
|
}
|
|
$extra_acl = $this->method2acl[$method];
|
|
if (!($entry = $this->read($id)) && ($method != 'PUT' || $entry === false) ||
|
|
($extra_acl != EGW_ACL_READ && $this->check_access($extra_acl,$entry) === false))
|
|
{
|
|
if ($return_no_access && !is_null($entry))
|
|
{
|
|
if ($this->debug) error_log(__METHOD__."($method,,$id,$return_no_access) is_null(\$entry)=".(int)is_null($entry).", set to false");
|
|
$return_no_access = false;
|
|
}
|
|
else
|
|
{
|
|
if ($this->debug) error_log(__METHOD__."($method,,$id) 403 Forbidden/404 Not Found: read($id)==".($entry===false?'false':'null'));
|
|
return !is_null($entry) ? '403 Forbidden' : '404 Not Found';
|
|
}
|
|
}
|
|
if ($entry)
|
|
{
|
|
$etag = $this->get_etag($entry);
|
|
// If the clients sends an "If-Match" header ($_SERVER['HTTP_IF_MATCH']) we check with the current etag
|
|
// of the calendar --> on failure we return 412 Precondition failed, to not overwrite the modifications
|
|
if (isset($_SERVER['HTTP_IF_MATCH']) && ($this->http_if_match = $_SERVER['HTTP_IF_MATCH']) != $etag)
|
|
{
|
|
if ($this->debug) error_log(__METHOD__."($method,,$id) HTTP_IF_MATCH='$_SERVER[HTTP_IF_MATCH]', etag='$etag': 412 Precondition failed");
|
|
return '412 Precondition Failed';
|
|
}
|
|
// 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 ($method == 'GET' && isset($_SERVER['HTTP_IF_NONE_MATCH']) && $_SERVER['HTTP_IF_NONE_MATCH'] == $etag)
|
|
{
|
|
if ($this->debug) error_log(__METHOD__."($method,,$id) HTTP_IF_NONE_MATCH='$_SERVER[HTTP_IF_NONE_MATCH]', etag='$etag': 304 Not Modified");
|
|
return '304 Not Modified';
|
|
}
|
|
}
|
|
return $entry;
|
|
}
|
|
|
|
/**
|
|
* Get the handler for the given app
|
|
*
|
|
* @static
|
|
* @param string $app 'calendar', 'addressbook' or 'infolog'
|
|
* @param int $debug=null debug-level to set
|
|
* @param string $base_uri=null base url of handler
|
|
* @return groupdav_handler
|
|
*/
|
|
static function &app_handler($app,$debug=null,$base_uri=null)
|
|
{
|
|
static $handler_cache = array();
|
|
|
|
if (!array_key_exists($app,$handler_cache))
|
|
{
|
|
$class = $app.'_groupdav';
|
|
if (!class_exists($class) && !class_exists($class = 'groupdav_'.$app)) return null;
|
|
|
|
$handler_cache[$app] = new $class($app,$debug,$base_uri);
|
|
}
|
|
return $handler_cache[$app];
|
|
}
|
|
} |