egroupware/phpgwapi/inc/class.groupdav_handler.inc.php

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<?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) 2007-9 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;
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/**
* Reference to the accounts class
*
* @var accounts
*/
var $accounts;
/**
* 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;
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/**
* principal URL
*
* @var string
*/
var $principalURL;
/**
* HTTP_IF_MATCH / etag of current request / last call to _common_get_put_delete() method
*
* @var string
*/
var $http_if_match;
/**
* Identified user agent
*
* @var string
*/
var $agent;
/**
* 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
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* @param string $principalURL=null pricipal url of handler
*/
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function __construct($app,$debug=null,$base_uri=null,$principalURL=null)
{
$this->app = $app;
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if (!is_null($debug)) $this->debug = $debug;
$this->base_uri = is_null($base_uri) ? $base_uri : $_SERVER['SCRIPT_NAME'];
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if (is_null($principalURL))
{
$this->principalURL = (@$_SERVER["HTTPS"] === "on" ? "https:" : "http:") .
'//'.$_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'] . '/';
}
else
{
$this->principalURL = $principalURL.'principals/users/'.
$GLOBALS['egw_info']['user']['account_lid'].'/';
}
$this->agent = self::get_agent();
$this->translation =& $GLOBALS['egw']->translation;
$this->egw_charset = $this->translation->charset();
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$this->accounts = $GLOBALS['egw']->accounts;
}
/**
* 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);
/**
* Propfind callback, if interator is used
*
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* @param string $path
* @param array $filter
* @param array|boolean $start false=return all or array(start,num)
* @param int &$total
* @return array with "files" array with values for keys path and props
*/
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function &propfind_callback($path, array $filter,$start,&$total) { }
/**
* Handle get request for an applications entry
*
* @param array &$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
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* @param string $displayname
* @param string $base_uri=null base url of handler
* @return array
*/
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static function extra_properties(array $props=array(), $displayname, $base_uri=null)
{
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($entry).") Cant create etag!");
return false;
}
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return 'EGw-'.$entry['id'].':'.(isset($entry['etag']) ? $entry['etag'] : $entry['modified']).'-wGE';
}
/**
* Convert etag to the raw etag column value (without quotes, double colon and id)
*
* @param string $etag
* @return int
*/
static function etag2value($etag)
{
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list(,$val) = explode(':',substr($etag,4,-4),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 $return_no_access===false
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* @return array|string entry on success, string with http-error-code on failure, null for PUT on an unknown id
*/
function _common_get_put_delete($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']))
{
if (strstr($_SERVER['HTTP_IF_MATCH'], $etag) === false)
{
$this->http_if_match = $_SERVER['HTTP_IF_MATCH'];
if ($this->debug) error_log(__METHOD__."($method,,$id) HTTP_IF_MATCH='$_SERVER[HTTP_IF_MATCH]', etag='$etag': 412 Precondition failed");
return '412 Precondition Failed';
}
else
{
$this->http_if_match = $etag;
// if an IF_NONE_MATCH is given, check if we need to send a new export, or the current one is still up-to-date
if ($method == 'GET' && isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
if ($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';
}
}
}
if (isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
if ($this->debug) error_log(__METHOD__."($method,,$id) HTTP_IF_NONE_MATCH='$_SERVER[HTTP_IF_NONE_MATCH]', etag='$etag': 412 Precondition failed");
return '412 Precondition Failed';
}
}
return $entry;
}
/**
* Get the handler for the given app
*
* @static
* @param string $app 'calendar', 'addressbook' or 'infolog'
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* @param int $user=null owner of the collection, default current user
* @param int $debug=null debug-level to set
* @param string $base_uri=null base url of handler
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* @param string $principalURL=null pricipal url of handler
* @return groupdav_handler
*/
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static function &app_handler($app,$debug=null,$base_uri=null,$principalURL=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;
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$handler_cache[$app] = new $class($app,$debug,$base_uri,$principalURL);
}
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$handler_cache[$app]->$debug = $debug;
$handler_cache[$app]->$base_uri = $base_uri;
$handler_cache[$app]->$principalURL = $principalURL;
if ($debug) error_log(__METHOD__."('$app', '$base_uri', '$principalURL')");
return $handler_cache[$app];
}
/**
* Identify know GroupDAV agents by HTTP_USER_AGENT header
*
* @return string|boolean agent name or false
*/
static function get_agent()
{
static $agent;
if (is_null($agent))
{
$agent = false;
// identify the agent (GroupDAV client) from the HTTP_USER_AGENT header
$user_agent = strtolower($_SERVER['HTTP_USER_AGENT']);
foreach(array(
'davkit' => 'davkit', // Apple iCal
'cfnetwork' => 'cfnetwork', // Apple Addressbook
'bionicmessage.net' => 'funambol', // funambol GroupDAV connector from bionicmessage.net
'zideone' => 'zideone', // zideone outlook plugin
'lightning' => 'lightning', // Lighting (SOGo connector for addressbook)
'khtml' => 'kde', // KDE clients
'neon' => 'neon'
) as $pattern => $name)
{
if (strpos($user_agent,$pattern) !== false)
{
$agent = $name;
break;
}
}
if (!$agent)
{
if ($this->debug) error_log("Unrecogniced GroupDAV client: HTTP_USER_AGENT='$_SERVER[HTTP_USER_AGENT]'!");
}
else
{
switch ($agent)
{
case 'cfnetwork':
if (preg_match('/address%20book\/([0-9.]+)/', $user_agent, $matches))
{
if ((int)$matches[1] < 868) $agent .= '_old';
}
}
}
}
return $agent;
}
}
/**
* Iterator for propfinds using propfind callback of a groupdav_handler to query results in chunks
*
* The propfind method just computes a filter and then returns an instance of this iterator instead of the files:
*
* function propfind($path,$options,&$files,$user,$id='')
* {
* $filter = array();
* // compute filter from path, options, ...
*
* $files['files'] = new groupdav_propfind_iterator($this,$filter,$files['files']);
*
* return true;
* }
*/
class groupdav_propfind_iterator implements Iterator
{
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/**
* current path
*
* @var string
*/
protected $path;
/**
* Handler to call for entries
*
* @var groupdav_handler
*/
protected $handler;
/**
* Filter of propfind call
*
* @var array
*/
protected $filter;
/**
* Extra responses to return too
*
* @var array
*/
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protected $common_files;
/**
* current chunk
*
* @var array
*/
protected $files;
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/**
* Start value for callback
*
* @var int
*/
protected $start=0;
/**
* Number of entries queried from callback in one call
*
*/
const CHUNK_SIZE = 500;
/**
* Log calls via error_log()
*
* @var boolean
*/
public $debug = false;
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/**
/**
* Constructor
*
* @param groupdav_handler $handler
* @param array $filter filter for propfind call
* @param array $files=null extra files/responses to return too
*/
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public function __construct(groupdav_handler $handler, $path, array $filter,array &$files=null)
{
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if ($this->debug) error_log(__METHOD__."('$path', ".array2string($filter).",)");
$this->path = $path;
$this->handler = $handler;
$this->filter = $filter;
$this->files = $files;
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$this->common_files = $files;
reset($this->files);
}
/**
* Return the current element
*
* @return array
*/
public function current()
{
if ($this->debug) error_log(__METHOD__."() returning ".array2string(current($this->files)));
return current($this->files);
}
/**
* Return the key of the current element
*
* @return int|string
*/
public function key()
{
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$current = current($this->files);
if ($this->debug) error_log(__METHOD__."() returning ".array2string($current['path']));
return $current['path']; // we return path as key
}
/**
* Move forward to next element (called after each foreach loop)
*/
public function next()
{
if (next($this->files) !== false)
{
if ($this->debug) error_log(__METHOD__."() returning TRUE");
return true;
}
// try query further files via propfind callback of handler and store result in $this->files
$this->files = $this->handler->propfind_callback($this->path,$this->filter,array($this->start,self::CHUNK_SIZE));
if (!is_array($this->files) || !($entries = count($this->files)))
{
if ($this->debug) error_log(__METHOD__."() returning FALSE (no more entries)");
return false; // no further entries
}
$this->start += $entries;
reset($this->files);
if ($this->debug) error_log(__METHOD__."() returning ".array2string(current($this->files) !== false));
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return current($this->files) !== false;
}
/**
* Rewind the Iterator to the first element (called at beginning of foreach loop)
*/
public function rewind()
{
if ($this->debug) error_log(__METHOD__."()");
// query first set of files via propfind callback of handler and store result in $this->files
$this->start = 0;
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$files = $this->handler->propfind_callback($this->path,$this->filter,array($this->start,self::CHUNK_SIZE));
$this->files = array_merge($this->common_files, $files);
$this->start += self::CHUNK_SIZE;
reset($this->files);
}
/**
* Checks if current position is valid
*
* @return boolean
*/
public function valid ()
{
if ($this->debug) error_log(__METHOD__."() returning ".array2string(current($this->files) !== false));
return current($this->files) !== false;
}
}