mirror of
https://github.com/EGroupware/egroupware.git
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523 lines
14 KiB
PHP
523 lines
14 KiB
PHP
<?php
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/**
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* EGroupware: GroupDAV access: abstract baseclass for groupdav/caldav/carddav handlers
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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) 2007-9 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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* EGroupware: GroupDAV access: abstract baseclass for groupdav/caldav/carddav handlers
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*/
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abstract class groupdav_handler
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{
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/**
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* Debug level: 0 = nothing, 1 = function calls, 2 = more info, eg. complete $_SERVER array
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*
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* The debug messages are send to the apache error_log
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*
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* @var integer
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*/
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var $debug = 0;
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/**
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* eGW's charset
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*
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* @var string
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*/
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var $egw_charset;
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/**
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* Reference to the translation class
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*
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* @var translation
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*/
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var $translation;
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/**
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* Reference to the accounts class
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*
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* @var accounts
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*/
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var $accounts;
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/**
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* Translates method names into ACL bits
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*
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* @var array
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*/
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var $method2acl = array(
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'GET' => EGW_ACL_READ,
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'PUT' => EGW_ACL_EDIT,
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'DELETE' => EGW_ACL_DELETE,
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);
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/**
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* eGW application responsible for the handler
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*
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* @var string
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*/
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var $app;
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/**
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* Base url of handler, need to prefix all pathes not automatic handled by HTTP_WebDAV_Server
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*
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* @var string
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*/
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var $base_uri;
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/**
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* principal URL
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*
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* @var string
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*/
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var $principalURL;
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/**
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* HTTP_IF_MATCH / etag of current request / last call to _common_get_put_delete() method
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*
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* @var string
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*/
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var $http_if_match;
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/**
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* Identified user agent
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*
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* @var string
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*/
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var $agent;
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/**
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* Constructor
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*
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* @param string $app 'calendar', 'addressbook' or 'infolog'
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* @param int $debug=null debug-level to set
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* @param string $base_uri=null base url of handler
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* @param string $principalURL=null pricipal url of handler
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*/
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function __construct($app,$debug=null,$base_uri=null,$principalURL=null)
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{
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$this->app = $app;
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if (!is_null($debug)) $this->debug = $debug;
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$this->base_uri = is_null($base_uri) ? $base_uri : $_SERVER['SCRIPT_NAME'];
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if (is_null($principalURL))
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{
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$this->principalURL = (@$_SERVER["HTTPS"] === "on" ? "https:" : "http:") .
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'//'.$_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'] . '/';
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}
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else
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{
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$this->principalURL = $principalURL.'principals/users/'.
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$GLOBALS['egw_info']['user']['account_lid'].'/';
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}
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$this->agent = self::get_agent();
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$this->translation =& $GLOBALS['egw']->translation;
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$this->egw_charset = $this->translation->charset();
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$this->accounts = $GLOBALS['egw']->accounts;
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}
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/**
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* Handle propfind request for an application folder
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*
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* @param string $path
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* @param array $options
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* @param array &$files
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* @param int $user account_id
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* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
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*/
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abstract function propfind($path,$options,&$files,$user);
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/**
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* Propfind callback, if interator is used
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*
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* @param string $path
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* @param array $filter
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* @param array|boolean $start false=return all or array(start,num)
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* @param int &$total
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* @return array with "files" array with values for keys path and props
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*/
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function &propfind_callback($path, array $filter,$start,&$total) { }
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/**
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* Handle get request for an applications entry
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*
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* @param array &$options
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* @param int $id
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* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
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*/
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abstract function get(&$options,$id);
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/**
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* Handle get request for an applications entry
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*
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* @param array &$options
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* @param int $id
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* @param int $user=null account_id of owner, default null
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* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
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*/
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abstract function put(&$options,$id,$user=null);
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/**
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* Handle get request for an applications entry
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*
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* @param array &$options
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* @param int $id
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* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
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*/
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abstract function delete(&$options,$id);
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/**
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* Read an entry
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*
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* @param string/int $id
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* @return array/boolean array with entry, false if no read rights, null if $id does not exist
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*/
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abstract function read($id);
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/**
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* Check if user has the neccessary rights on an entry
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*
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* @param int $acl EGW_ACL_READ, EGW_ACL_EDIT or EGW_ACL_DELETE
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* @param array/int $entry entry-array or id
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* @return boolean null if entry does not exist, false if no access, true if access permitted
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*/
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abstract function check_access($acl,$entry);
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/**
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* Add extra properties for collections
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*
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* @param array $props=array() regular props by the groupdav handler
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* @param string $displayname
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* @param string $base_uri=null base url of handler
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* @return array
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*/
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static function extra_properties(array $props=array(), $displayname, $base_uri=null)
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{
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return $props;
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}
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/**
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* Get the etag for an entry, can be reimplemented for other algorithm or field names
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*
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* @param array/int $event array with event or cal_id
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* @return string/boolean string with etag or false
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*/
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function get_etag($entry)
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{
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if (!is_array($entry))
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{
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$entry = $this->read($entry);
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}
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if (!is_array($entry) || !isset($entry['id']) || !(isset($entry['modified']) || isset($entry['etag'])))
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{
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// error_log(__METHOD__."(".array2string($entry).") Cant create etag!");
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return false;
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}
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return 'EGw-'.$entry['id'].':'.(isset($entry['etag']) ? $entry['etag'] : $entry['modified']).'-wGE';
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}
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/**
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* Convert etag to the raw etag column value (without quotes, double colon and id)
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*
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* @param string $etag
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* @return int
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*/
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static function etag2value($etag)
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{
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list(,$val) = explode(':',substr($etag,4,-4),2);
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return $val;
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}
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/**
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* Handle common stuff for get, put and delete requests:
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* - application rights
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* - entry level acl, incl. edit and delete rights
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* - etag handling for precondition failed and not modified
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*
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* @param string $method GET, PUT, DELETE
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* @param array &$options
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* @param int $id
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* @param boolean &$return_no_access=false if set to true on call, instead of '403 Forbidden' the entry is returned and $return_no_access===false
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* @return array|string entry on success, string with http-error-code on failure, null for PUT on an unknown id
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*/
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function _common_get_put_delete($method,&$options,$id,&$return_no_access=false)
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{
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if (!in_array($this->app,array('principals','groups')) && !$GLOBALS['egw_info']['user']['apps'][$this->app])
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{
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if ($this->debug) error_log(__METHOD__."($method,,$id) 403 Forbidden: no app rights for '$this->app'");
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return '403 Forbidden'; // no app rights
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}
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$extra_acl = $this->method2acl[$method];
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if (!($entry = $this->read($id)) && ($method != 'PUT' || $entry === false) ||
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($extra_acl != EGW_ACL_READ && $this->check_access($extra_acl,$entry) === false))
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{
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if ($return_no_access && !is_null($entry))
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{
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if ($this->debug) error_log(__METHOD__."($method,,$id,$return_no_access) is_null(\$entry)=".(int)is_null($entry).", set to false");
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$return_no_access = false;
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}
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else
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{
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if ($this->debug) error_log(__METHOD__."($method,,$id) 403 Forbidden/404 Not Found: read($id)==".($entry===false?'false':'null'));
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return !is_null($entry) ? '403 Forbidden' : '404 Not Found';
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}
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}
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if ($entry)
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{
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$etag = $this->get_etag($entry);
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// If the clients sends an "If-Match" header ($_SERVER['HTTP_IF_MATCH']) we check with the current etag
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// of the calendar --> on failure we return 412 Precondition failed, to not overwrite the modifications
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if (isset($_SERVER['HTTP_IF_MATCH']) && ($this->http_if_match = $_SERVER['HTTP_IF_MATCH']) != $etag)
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{
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if ($this->debug) error_log(__METHOD__."($method,,$id) HTTP_IF_MATCH='$_SERVER[HTTP_IF_MATCH]', etag='$etag': 412 Precondition failed");
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return '412 Precondition Failed';
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}
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// 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
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if ($method == 'GET' && isset($_SERVER['HTTP_IF_NONE_MATCH']) && $_SERVER['HTTP_IF_NONE_MATCH'] == $etag)
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{
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if ($this->debug) error_log(__METHOD__."($method,,$id) HTTP_IF_NONE_MATCH='$_SERVER[HTTP_IF_NONE_MATCH]', etag='$etag': 304 Not Modified");
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return '304 Not Modified';
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}
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}
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return $entry;
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}
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/**
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* Get the handler for the given app
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*
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* @static
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* @param string $app 'calendar', 'addressbook' or 'infolog'
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* @param int $user=null owner of the collection, default current user
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* @param int $debug=null debug-level to set
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* @param string $base_uri=null base url of handler
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* @param string $principalURL=null pricipal url of handler
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* @return groupdav_handler
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*/
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static function &app_handler($app,$debug=null,$base_uri=null,$principalURL=null)
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{
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static $handler_cache = array();
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if (!array_key_exists($app,$handler_cache))
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{
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$class = $app.'_groupdav';
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if (!class_exists($class) && !class_exists($class = 'groupdav_'.$app)) return null;
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$handler_cache[$app] = new $class($app,$debug,$base_uri,$principalURL);
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}
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$handler_cache[$app]->$debug = $debug;
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$handler_cache[$app]->$base_uri = $base_uri;
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$handler_cache[$app]->$principalURL = $principalURL;
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if ($debug) error_log(__METHOD__."('$app', '$base_uri', '$principalURL')");
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return $handler_cache[$app];
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}
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/**
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* Identify know GroupDAV agents by HTTP_USER_AGENT header
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*
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* @return string|boolean agent name or false
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*/
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static function get_agent()
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{
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static $agent;
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if (is_null($agent))
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{
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$agent = false;
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// identify the agent (GroupDAV client) from the HTTP_USER_AGENT header
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$user_agent = strtolower($_SERVER['HTTP_USER_AGENT']);
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foreach(array(
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'davkit' => 'davkit', // Apple iCal
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'cfnetwork' => 'cfnetwork', // Apple Addressbook
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'bionicmessage.net' => 'funambol', // funambol GroupDAV connector from bionicmessage.net
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'zideone' => 'zideone', // zideone outlook plugin
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'lightning' => 'lightning', // Lighting (SOGo connector for addressbook)
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'khtml' => 'kde', // KDE clients
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'cadaver' => 'cadaver',
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) as $pattern => $name)
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{
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if (strpos($user_agent,$pattern) !== false)
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{
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$agent = $name;
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break;
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}
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}
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if (!$agent)
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{
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error_log("Unrecogniced GroupDAV client: HTTP_USER_AGENT='$_SERVER[HTTP_USER_AGENT]'!");
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}
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}
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return $agent;
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}
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}
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/**
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* Iterator for propfinds using propfind callback of a groupdav_handler to query results in chunks
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*
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* The propfind method just computes a filter and then returns an instance of this iterator instead of the files:
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*
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* function propfind($path,$options,&$files,$user,$id='')
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* {
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* $filter = array();
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* // compute filter from path, options, ...
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*
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* $files['files'] = new groupdav_propfind_iterator($this,$filter,$files['files']);
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*
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* return true;
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* }
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*/
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class groupdav_propfind_iterator implements Iterator
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{
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/**
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* current path
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*
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* @var string
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*/
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protected $path;
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/**
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* Handler to call for entries
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*
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* @var groupdav_handler
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*/
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protected $handler;
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/**
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* Filter of propfind call
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*
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* @var array
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*/
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protected $filter;
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/**
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* Extra responses to return too
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*
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* @var array
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*/
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protected $common_files;
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/**
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* current chunk
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*
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* @var array
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*/
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protected $files;
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/**
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* Start value for callback
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*
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* @var int
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*/
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protected $start=0;
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/**
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* Number of entries queried from callback in one call
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*
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*/
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const CHUNK_SIZE = 500;
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/**
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* Log calls via error_log()
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*
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* @var boolean
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*/
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public $debug = false;
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/**
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/**
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* Constructor
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*
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* @param groupdav_handler $handler
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* @param array $filter filter for propfind call
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* @param array $files=null extra files/responses to return too
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*/
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public function __construct(groupdav_handler $handler, $path, array $filter,array &$files=null)
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{
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if ($this->debug) error_log(__METHOD__."('$path', ".array2string($filter).",)");
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$this->path = $path;
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$this->handler = $handler;
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$this->filter = $filter;
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$this->files = $files;
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$this->common_files = $files;
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reset($this->files);
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}
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/**
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* Return the current element
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*
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* @return array
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*/
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public function current()
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{
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if ($this->debug) error_log(__METHOD__."() returning ".array2string(current($this->files)));
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return current($this->files);
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}
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/**
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* Return the key of the current element
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*
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* @return int|string
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*/
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public function key()
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{
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$current = current($this->files);
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if ($this->debug) error_log(__METHOD__."() returning ".array2string($current['path']));
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return $current['path']; // we return path as key
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}
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/**
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* Move forward to next element (called after each foreach loop)
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*/
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public function next()
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{
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if (next($this->files) !== false)
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{
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if ($this->debug) error_log(__METHOD__."() returning TRUE");
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return true;
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}
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// try query further files via propfind callback of handler and store result in $this->files
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$this->files = $this->handler->propfind_callback($this->path,$this->filter,array($this->start,self::CHUNK_SIZE));
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if (!is_array($this->files) || !($entries = count($this->files)))
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{
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if ($this->debug) error_log(__METHOD__."() returning FALSE (no more entries)");
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return false; // no further entries
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}
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$this->start += $entries;
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reset($this->files);
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if ($this->debug) error_log(__METHOD__."() returning ".array2string(current($this->files) !== false));
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return current($this->files) !== false;
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}
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/**
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* Rewind the Iterator to the first element (called at beginning of foreach loop)
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*/
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public function rewind()
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{
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if ($this->debug) error_log(__METHOD__."()");
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// query first set of files via propfind callback of handler and store result in $this->files
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$this->start = 0;
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$files = $this->handler->propfind_callback($this->path,$this->filter,array($this->start,self::CHUNK_SIZE));
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$this->files = array_merge($this->common_files, $files);
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$this->start += self::CHUNK_SIZE;
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reset($this->files);
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}
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/**
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* Checks if current position is valid
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*
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* @return boolean
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*/
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public function valid ()
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{
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if ($this->debug) error_log(__METHOD__."() returning ".array2string(current($this->files) !== false));
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return current($this->files) !== false;
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}
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}
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