egroupware_official/phpgwapi/inc/class.groupdav_handler.inc.php
Ralf Becker dbd15105e0 * CalDAV/CardDAV: do NOT use Content-Length header, if zlib.output_compression is enabled, fixes problems with iOS7 eg. eTask app
Content-Length is size AFTER applying transfer encoding which compression is, as compression is done in PHP outside our control, we only set wrong (to big) size
2013-11-20 14:12:47 +00:00

900 lines
27 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) 2007-13 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @version $Id$
*/
/**
* EGroupware: GroupDAV access: abstract baseclass for groupdav/caldav/carddav handlers
*
* Permanent error_log() calls should use $this->groupdav->log($str) instead, to be send to PHP error_log()
* and our request-log (prefixed with "### " after request and response, like exceptions).
*
* @ToDo: If precondition for PUT, see https://tools.ietf.org/html/rfc6578#section-5
*/
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 accounts class
*
* @var accounts
*/
var $accounts;
/**
* Reference to the ACL class
*
* @var acl
*/
var $acl;
/**
* 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;
/**
* Calling groupdav object
*
* @var groupdav
*/
var $groupdav;
/**
* 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;
/**
* Identified user agent
*
* @var string
*/
var $agent;
/**
* Extension to append to url/path
*
* @var string
*/
static $path_extension = '.ics';
/**
* Which attribute to use to contruct name part of url/path
*
* @var string
*/
static $path_attr = 'id';
/**
* New id of put/post stored here by put_response_headers for check_return_representation
*
* @var string
*/
var $new_id;
/**
* Constructor
*
* @param string $app 'calendar', 'addressbook' or 'infolog'
* @param groupdav $groupdav calling class
*/
function __construct($app, groupdav $groupdav)
{
$this->app = $app;
if (!is_null($parent->debug)) $this->debug = $groupdav->debug;
$this->base_uri = $groupdav->base_uri;
$this->groupdav = $groupdav;
$this->agent = self::get_agent();
$this->egw_charset = translation::charset();
$this->accounts = $GLOBALS['egw']->accounts;
$this->acl = $GLOBALS['egw']->acl;
}
/**
* 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
*
* @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
*/
function &propfind_callback($path, array $filter,$start,&$total) { }
/**
* Handle get request for an applications entry
*
* @param array &$options
* @param int $id
* @param int $user=null account_id
* @return mixed boolean true on success, false on failure or string with http status (eg. '404 Not Found')
*/
abstract function get(&$options,$id,$user=null);
/**
* 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
* @param string $path=null implementation can use it, used in call from _common_get_put_delete
* @return array|boolean array with entry, false if no read rights, null if $id does not exist
*/
abstract function read($id /*,$path=null*/);
/**
* Get id from entry-array returned by read()
*
* @param int|string|array $entry
* @return int|string
*/
function get_id($entry)
{
return is_array($entry) ? $entry['id'] : $entry;
}
/**
* 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
* @param string $displayname
* @param string $base_uri=null base url of handler
* @param int $user=null account_id of owner of collection
* @return array
*/
public function extra_properties(array $props=array(), $displayname, $base_uri=null, $user=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;
}
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(,$val) = explode(':',$etag,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|string &$id on return self::$path_extension got removed
* @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
* @param boolean $ignore_if_match=false if true, ignore If-Match precondition
* @return array|string entry on success, string with http-error-code on failure, null for PUT on an unknown id
*/
function _common_get_put_delete($method,&$options,&$id,&$return_no_access=false,$ignore_if_match=false)
{
if (self::$path_extension) $id = basename($id,self::$path_extension);
if ($this->app != 'principals' && !$GLOBALS['egw_info']['user']['apps'][$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, $options['path'])) && ($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,$return_no_access) \$entry=".array2string($entry).", \$return_no_access 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']) && !$ignore_if_match)
{
$this->http_if_match = $_SERVER['HTTP_IF_MATCH'];
// strip of quotes around etag, if they exist, that way we allow etag with and without quotes
if ($this->http_if_match[0] == '"') $this->http_if_match = substr($this->http_if_match, 1, -1);
if ($this->http_if_match !== $etag)
{
if ($this->debug) error_log(__METHOD__."($method,path=$options[path],$id) HTTP_IF_MATCH='$_SERVER[HTTP_IF_MATCH]', etag='$etag': 412 Precondition failed".array2string($entry));
// honor Prefer: return=representation for 412 too (no need for client to explicitly reload)
$this->check_return_representation($options, $id);
return '412 Precondition Failed';
}
}
if (isset($_SERVER['HTTP_IF_NONE_MATCH']))
{
$if_none_match = $_SERVER['HTTP_IF_NONE_MATCH'];
// strip of quotes around etag, if they exist, that way we allow etag with and without quotes
if ($if_none_match[0] == '"') $if_none_match = substr($if_none_match, 1, -1);
// 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 (in_array($method, array('GET','HEAD')) && $etag === $if_none_match)
{
if ($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 ($method == 'PUT' && ($if_none_match == '*' || $if_none_match == $etag))
{
if ($this->debug) error_log(__METHOD__."($method,,$id) HTTP_IF_NONE_MATCH='$_SERVER[HTTP_IF_NONE_MATCH]', etag='$etag': 412 Precondition failed");
// honor Prefer: return=representation for 412 too (no need for client to explicitly reload)
$this->check_return_representation($options, $id);
return '412 Precondition Failed';
}
}
}
return $entry;
}
/**
* Return representation, if requested by HTTP Prefer header
*
* @param array $options
* @param int $id
* @param int $user=null account_id
* @return string|boolean http status of get or null if no representation was requested
*/
public function check_return_representation($options, $id, $user=null)
{
//error_log(__METHOD__."(, $id, $user) start ".function_backtrace());
if (isset($_SERVER['HTTP_PREFER']) && in_array('return=representation', preg_split('/, ?/', $_SERVER['HTTP_PREFER'])))
{
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
$location = $this->groupdav->base_uri.$options['path'];
if ($location[0] == '/')
{
$location = (@$_SERVER['HTTPS'] === 'on' ? 'https' : 'http').'://'.$_SERVER['HTTP_HOST'].$location;
}
header('Content-Location: '.$location);
}
// remove If-Match or If-None-Match headers, otherwise HTTP status 412 goes into endless loop!
unset($_SERVER['HTTP_IF_MATCH']);
unset($_SERVER['HTTP_IF_NONE_MATCH']);
if (($ret = $this->get($options, $id ? $id : $this->new_id, $user)) && !empty($options['data']))
{
if (!$this->groupdav->use_compression()) header('Content-Length: '.$this->groupdav->bytes($options['data']));
header('Content-Type: '.$options['mimetype']);
echo $options['data'];
}
}
//error_log(__METHOD__."(, $id, $user) returning ".array2string($ret));
return $ret;
}
/**
* Update etag, ctag and sync-token to reflect changed attachments
*
* Not abstract, as not need to implement for apps not supporting managed attachments
*
* @param array|string|int $entry array with entry data from read, or id
*/
public function update_tags($entry)
{
}
/**
* Get the handler for the given app
*
* @static
* @param string $app 'calendar', 'addressbook' or 'infolog'
* @param groupdav $groupdav calling class
* @return groupdav_handler
*/
static function app_handler($app, $groupdav)
{
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, $groupdav);
}
if ($debug) error_log(__METHOD__."('$app')");
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(
'carddav-sync' => 'carddav-sync', // dmfs.org CardDAV client for Android: CardDAV-Sync (Android) (like iOS/5.0.1 (9A405) dataaccessd/1.0) gzip
'iphone' => 'iphone', // Apple iPhone iCal
'davkit' => 'davkit', // Apple iCal 10.6
'coredav' => 'coredav', // Apple iCal 10.7
'calendarstore' => 'calendarstore', // Apple iCal 5.0.1 under OS X 10.7.2
'calendaragent/' => 'calendaragent', // Apple iCal OS X 10.8*: Mac OS X/10.8.2 (12C54) CalendarAgent/55
'dataaccess' => 'dataaccess', // Apple addressbook iPhone
'cfnetwork' => 'cfnetwork', // Apple Addressbook 10.6/7
'addressbook/' => 'cfnetwork', // Apple Addressbook OS X 10.8*: Mac OS X/10.8.2 (12C54) AddressBook/1167
'bionicmessage.net' => 'funambol', // funambol GroupDAV connector from bionicmessage.net
'zideone' => 'zideone', // zideone outlook plugin
'lightning' => 'lightning', // Lighting (incl. SOGo connector for addressbook)
'webkit' => 'webkit', // Webkit Browser (also reports KHTML!)
'akonadi' => 'akonadi', // new KDE PIM framework (also reports KHTML!)
'khtml' => 'kde', // KDE clients
'neon' => 'neon',
'ical4ol' => 'ical4ol', // iCal4OL client
'evolution' => 'evolution', // Evolution
'thunderbird' => 'thunderbird', // SOGo connector for addressbook, no Lightning installed
) as $pattern => $name)
{
if (strpos($user_agent,$pattern) !== false)
{
$agent = $name;
break;
}
}
if (!$agent)
{
//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';
}
break;
case 'kde':
// Akonadi (new KDE Pim framework) unfortunately has same user-agent as old kde
// we can only assume KDE 4.7+ uses Akonadi native resource, while below this was not available
// Unfortunately the old pre-Akonadi GroupDAV resource can still be used, but we have no way of detecting it
if (preg_match('/KHTML\/([0-9.]+)/', $_SERVER['HTTP_USER_AGENT'], $matches) && (float)$matches[1] >= 4.7)
{
$agent = 'akonadi';
}
break;
}
}
}
if ($debug) error_log(__METHOD__."GroupDAV client: $agent");
return $agent;
}
/**
* Get grants of current user and app
*
* @return array user-id => EGW_ACL_ADD|EGW_ACL_READ|EGW_ACL_EDIT|EGW_ACL_DELETE pairs
*/
public function get_grants()
{
return $this->acl->get_grants($this->app, $this->app != 'addressbook');
}
/**
* Return priviledges for current user, default is read and read-current-user-privilege-set
*
* Priviledges are for the collection, not the resources / entries!
*
* @param string $path path of collection
* @param int $user=null owner of the collection, default current user
* @return array with privileges
*/
public function current_user_privileges($path, $user=null)
{
static $grants;
if (is_null($grants))
{
$grants = $this->get_grants();
}
$priviledes = array('read-current-user-privilege-set' => 'read-current-user-privilege-set');
if (is_null($user) || $grants[$user] & EGW_ACL_READ)
{
$priviledes['read'] = 'read';
// allows on all calendars/addressbooks to write properties, as we store them on a per-user basis
// and only allow to modify explicit named properties in CalDAV, CardDAV or Calendarserver name-space
$priviledes['write-properties'] = 'write-properties';
}
if (is_null($user) || $grants[$user] & EGW_ACL_ADD)
{
$priviledes['bind'] = 'bind'; // PUT for new resources
}
if (is_null($user) || $grants[$user] & EGW_ACL_EDIT)
{
$priviledes['write-content'] = 'write-content'; // otherwise iOS calendar does not allow to add events
}
if (is_null($user) || $grants[$user] & EGW_ACL_DELETE)
{
$priviledes['unbind'] = 'unbind'; // DELETE
}
// copy/move of existing resources might require write-properties, thought we do not support an explicit PROPATCH
//error_log(__METHOD__."('$path', ".array2string($user).') returning '.array2string($priviledes).' '.function_backtrace());
return $priviledes;
}
/**
* Create the path/name for an entry
*
* @param array $entry
* @return string
*/
function get_path($entry)
{
return $entry[self::$path_attr].self::$path_extension;
}
/**
* Send response-headers for a PUT (or POST with add-member query parameter)
*
* @param int|array $entry id or array of new created entry
* @param string $path
* @param int|string $retval
* @param boolean $path_attr_is_name=true true: path_attr is ca(l|rd)dav_name, false: id (GroupDAV needs Location header)
* @param string $etag=null etag, to not calculate it again (if != null)
*/
function put_response_headers($entry, $path, $retval, $path_attr_is_name=true, $etag=null)
{
//error_log(__METHOD__."(".array2string($entry).", '$path', ".array2string($retval).", path_attr_is_name=$path_attr_is_name, etag=".array2string($etag).")");
// we should not return an etag here, as EGroupware never stores ical/vcard byte-by-byte
// as SOGO Connector requires ETag header to recognice as successful PUT, we are sending them again for it
// --> as all clients dislike not getting an ETag for a PUT, we sending it again even not storing byte-by-byte
//if (get_class($this) == 'addressbook_groupdav' && in_array(self::get_agent(),array('thunderbird','lightning')))
{
if (is_null($etag)) $etag = $this->get_etag($entry);
header('ETag: "'.$etag.'"');
}
// store (new) id for check_return_representation
$this->new_id = $this->get_path($entry);
// send Location header only on success AND if we dont use caldav_name as path-attribute or
if ((is_bool($retval) ? $retval : $retval[0] === '2') && (!$path_attr_is_name ||
// POST with add-member query parameter
$_SERVER['REQUEST_METHOD'] == 'POST' && isset($_GET['add-member'])))
{
$path = preg_replace('|(.*)/[^/]*|', '\1/', $path);
header('Location: '.$this->base_uri.$path.$this->get_path($entry));
}
}
/**
* Return calendars/addressbooks shared from other users with the current one
*
* return array account_id => account_lid pairs
*/
function get_shared()
{
return array();
}
/**
* Return appliction specific settings
*
* @param array $hook_data
* @return array of array with settings
*/
static function get_settings($hook_data)
{
return array();
}
/**
* Add a resource
*
* @param string $path path of collection, NOT entry!
* @param array $entry
* @param array $props
* @return array with values for keys 'path' and 'props'
*/
public function add_resource($path, array $entry, array $props)
{
// only run get_etag, if we really need it, as it might be expensive (eg. calendar)
if (!isset($props['getetag']))
{
$props['getetag'] = $this->get_etag($entry);
}
foreach(array(
'getcontenttype' => 'text/calendar',
'getlastmodified' => $entry['modified'],
'displayname' => $entry['title'],
) as $name => $value)
{
if (!isset($props[$name]))
{
$props[$name] = $value;
}
}
// if requested add privileges
$privileges = array('read', 'read-current-user-privilege-set');
if ($this->groupdav->prop_requested('current-user-privilege-set') === true && !isset($props['current-user-privilege-set']))
{
if ($this->check_access(EGW_ACL_EDIT, $entry))
{
$privileges[] = 'write-content';
}
}
if ($this->groupdav->prop_requested('owner') === true && !isset($props['owner']) &&
($account_lid = $this->accounts->id2name($entry['owner'])))
{
$type = $this->accounts->get_type($entry['owner']) == 'u' ? 'users' : 'groups';
$props['owner'] = HTTP_WebDAV_Server::mkprop('href', $this->base_uri.'/principals/'.$type.'/'.$account_lid.'/');
}
// we urldecode here, as HTTP_WebDAV_Server uses a minimal (#?%) urlencoding for incomming pathes and urlencodes pathes in propfind
return $this->groupdav->add_resource($path.urldecode($this->get_path($entry)), $props, $privileges);
}
/**
* Return base uri, making sure it's either a full uri (incl. protocoll and host) or just a path
*
* base_uri of WebDAV class can be both, depending on EGroupware config
*
* @param boolean $full_uri=true
* @return string eg. https://domain.com/egroupware/groupdav.php
*/
public function base_uri($full_uri=true)
{
static $uri;
static $path;
if (!isset($uri))
{
$uri = $path = $this->groupdav->base_uri;
if ($uri[0] == '/')
{
$uri = ($_SERVER["HTTPS"] === "on" ? "https:" : "http:") .'//' . $_SERVER['HTTP_HOST'] . $uri;
}
else
{
$path = parse_url($uri, PHP_URL_PATH);
}
}
return $full_uri ? $uri : $path;
}
/**
* sync-token to be filled by propfind_callback and returned by get_sync_token method
*/
protected $sync_collection_token;
/**
* Query sync-token from a just run sync-collection report
*
* Modified time is taken from value filled by propfind_callback in sync_collection_token.
*
* @param string $path
* @param int $user parameter necessary to call getctag, if no $token specified
* @return string
*/
public function get_sync_collection_token($path, $user=null)
{
return $this->get_sync_token($path, $user, $this->sync_collection_token);
}
/**
* Query sync-token
*
* We use ctag / max. modification time as sync-token. As garnularity is 1sec, we can never be sure,
* if there are more modifications to come in the current second.
*
* Therefor we are never returning current time, but 1sec less!
*
* Modified time is either taken from value filled by propfind_callback in $this->sync_token or
* by call to getctag();
*
* @param string $path
* @param int $user parameter necessary to call getctag, if no $token specified
* @param int $token=null modification time, default call getctag($path, $user) to fetch it
* @return string
*/
public function get_sync_token($path, $user, $token=null)
{
if (!isset($token)) $token = $this->getctag($path, $user);
// never return current time, as more modifications might happen due to second granularity --> return 1sec less
if ($token >= (int)$GLOBALS['egw_info']['flags']['page_start_time'])
{
$token = (int)$GLOBALS['egw_info']['flags']['page_start_time'] - 1;
}
return $this->base_uri().$path.$token;
}
}
/**
* Iterator for propfinds using propfind callback of a groupdav_handler to query results in chunks
*
* The propfind method just computes a filter and then returns an instance of this iterator instead of the files:
*
* function propfind($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
{
/**
* 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
*/
protected $common_files;
/**
* current chunk
*
* @var array
*/
protected $files;
/**
* 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;
/**
/**
* Constructor
*
* @param groupdav_handler $handler
* @param array $filter filter for propfind call
* @param array $files=array() extra files/responses to return too
*/
public function __construct(groupdav_handler $handler, $path, array $filter,array &$files=array())
{
if ($this->debug) error_log(__METHOD__."('$path', ".array2string($filter).",)");
$this->path = $path;
$this->handler = $handler;
$this->filter = $filter;
$this->files = $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()
{
$current = current($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 ($this->debug) error_log(__METHOD__."() returning TRUE");
return true;
}
// check if previous query gave less then CHUNK_SIZE entries --> we're done
if ($this->start && count($this->files) < self::CHUNK_SIZE)
{
if ($this->debug) error_log(__METHOD__."() returning FALSE (no more entries)");
return false;
}
// 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
}
$this->start += self::CHUNK_SIZE;
reset($this->files);
if ($this->debug) error_log(__METHOD__."() this->start=$this->start, entries=$entries, count(this->files)=".count($this->files)." returning ".array2string(current($this->files) !== false));
return current($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__."()");
$this->start = 0;
$this->files = $this->common_files;
if (!$this->files) $this->next(); // otherwise valid will return false and nothing get returned
reset($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;
}
}