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egroupware/api/src/Link.php

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<?php
/**
* EGroupware API - Interapplicaton links
*
* Links have two ends each pointing to an entry, each entry is a double:
* - app app-name or directory-name of an egw application, eg. 'infolog'
* - id this is the id, eg. an integer or a tupple like '0:INBOX:1234'
*
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright 2001-2016 by RalfBecker@outdoor-training.de
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @subpackage link
* @version $Id$
*/
namespace EGroupware\Api;
/**
* Generalized linking between entries of EGroupware apps
*
* Please note: this class can NOT and does not need to be initialised, all methods are static
*
* To participate in the linking an applications has to implement the following hooks:
*
* /**
* * Hook called by link-class to include app in the appregistry of the linkage
* *
* * @param array|string $location location and other parameters (not used)
* * @return array with method-names
* *%
* function search_link($location)
* {
* return array(
* 'query' => 'app.class.link_query', // method to search app for a pattern: array link_query(string $pattern, array $options)
* 'title' => 'app.class.link_title', // method to return title of an entry of app: string/false/null link_title(int/string $id)
* 'titles' => 'app.class.link_titles', // method to return multiple titles: array link_title(array $ids)
* 'view' => array( // get parameters to view an entry of app
* 'menuaction' => 'app.class.method',
* ),
* 'types' => array( // Optional list of sub-types to filter (eg organisations), app to handle different queries
* 'type_key' => array(
* 'name' => 'Human Reference',
* 'icon' => 'app/icon' // Optional icon to use for that sub-type
* )
* ),
* 'view_id' => 'app_id', // name of get parameter of the id
* 'view_popup' => '400x300', // size of popup (XxY), if view is in popup
* 'view_list' => 'app.class.method' // deprecated use 'list' instead
* 'list' => array( // Method to be called to display a list of links, method should check $_GET['search'] to filter
* 'menuaction' => 'app.class.method',
* ),
* 'list_popup' => '400x300'
* 'add' => array( // get parameter to add an empty entry to app
* 'menuaction' => 'app.class.method',
* ),
* 'add_app' => 'link_app', // name of get parameter to add links to other app
* 'add_id' => 'link_id', // --------------------- " ------------------- id
* 'add_popup' => '400x300', // size of popup (XxY), if add is in popup
* 'notify' => 'app.class.method', // method to be called if an other applications links or unlinks with app: notify(array $data)
* 'file_access' => 'app.class.method', // method to be called to check file access rights of a given user, see links_stream_wrapper class
* // boolean file_access(string $id,int $check,string $rel_path=null,int $user=null)
* 'file_access_user' => false, // true if file_access method supports 4th parameter $user, if app is NOT supporting it
* // Link::file_access() returns false for $user != current user!
* 'file_dir' => 'app/sub', // sub file dir for uploaded files/links
* 'find_extra' => array('name_preg' => '/^(?!.picture.jpg)$/') // extra options to Vfs::find, to eg. remove some files from the list of attachments
* 'edit' => array(
* 'menuaction' => 'app.class.method',
* ),
* 'edit_id' => 'app_id',
* 'edit_popup' => '400x300',
* 'name' => 'Some name', // Name to use instead of app-name
* 'icon' => 'app/icon', // Optional icon to use instead of app-icon
* 'entry' => 'Contact', // Optional name for single entry of app, eg. "contact" used instead of appname
* 'entries' => 'Contacts', // Optional name for multiple entries of app, eg. "contacts" used instead of appname
* 'modification_time' => array( // Optional location of entry's last modification
* 'column' => {string} table.column // Table & column name
* 'type' => {string} longint // Data type for the column, if it's not a timestamp
* ),
* 'mime' => array( // Optional register mime-types application can open
* 'text/something' => array(
* 'mime_url' => $attr, // either mime_url or mime_data is required for server-side processing!
* 'mime_data' => $attr, // md5-hash returned from Link::set_data() to retrive content (only server-side)
* 'menuaction' => 'app.class.method', // method to call
* 'mime_popup' => '400x300', // optional size of popup
* 'mime_target' => '_self', // optional target, default _blank
* // other get-parameters to set in url
* ),
* // further mime types supported ...
* ),
* 'fetch' => 'app.class.method', // method to return entry data for a given id. the method called should support id, and expected mime-type
* // basically you should return something like array(id, title, mimetype, body, linked-files)
*
* 'push_data' => <callable> | "key" | ["key1", ...] // keys of ACL relevant and privacy save data needed for push of changes to client
* // or callable to do the cleaning eg. used in calendar
*
* 'additional' => array( // allow one app to register sub-types,
* 'app-sub' => array( // different from 'types' approach above
* // every value defined above
* )
* )
* }
* All entries are optional, thought you only get conected functionality, if you implement them ...
*
* The BO-layer implementes some extra features on top of the so-layer:
* 1) It handles links to not already existing entries. This is used by the eTemplate link-widget, which allows to
* setup links even for new / not already existing entries, before they get saved.
* In that case you have to set the first id to 0 for the link-static function and pass the array returned in that id
* (not the return-value) after saveing your new entry again to the link static function.
* 2) Attaching files: they are saved in the vfs and not the link-table (!).
* Attached files are stored under $vfs_basedir='/infolog' in the vfs!
* 3) It manages the link-registry, in which apps can register themselfs by implementing some hooks
* 4) It notifies apps, who registered for that service, about changes in the links their entries
*
* Modification times in links (and deleted timestamp) are always in server-time!
* (We dont convert them here, as most apps ignore them anyway)
*/
class Link extends Link\Storage
{
/**
* appname used for returned attached files (!= 'filemanager'!)
*/
const VFS_APPNAME = 'file'; // pseudo-appname for own file-attachments in vfs, this is NOT the vfs-app
/**
* Appname used of files stored via Link::set_data()
*/
const DATA_APPNAME = 'egw-data';
/**
* appname used for linking existing files to VFS
*/
const VFS_LINK = 'link';
/**
* Baseurl for the attachments in the vfs
*/
const VFS_BASEURL = 'vfs://default/apps';
/**
* Turns on debug-messages
*/
const DEBUG = false;
/**
* other apps can participate in the linking by implementing a 'search_link' hook, which
* has to return an array in the format of an app_register entry below
*
* @var array
*/
static $app_register = array(
'api-accounts' => array( // user need run-rights for home
'app' => 'api',
'name' => 'Accounts',
'icon' => 'addressbook/accounts',
'query' => 'EGroupware\\Api\\Accounts::link_query',
'title' => 'EGroupware\\Api\\Accounts::username',
'view' => array('menuaction'=>'addressbook.addressbook_ui.view','ajax'=>'true'),
'view_id' => 'account_id'
),
'api' => array(
// handling of text or pdf files by browser in a popup window
'mime' => array(
'application/pdf' => array(
'mime_popup' => '640x480',
'mime_target' => '_blank',
),
'/^text\\/(plain|html|diff)/' => array( // text/(mimetypes which can be opened as recognised popups)
'mime_popup' => '640x480',
'mime_target' => '_blank',
),
'/^image\\//' => array( // image
'mime_popup' => '640x480',
'mime_target' => '_blank',
),
),
),
);
/**
* Max. number of titles stored in session (older once get removed)
*/
const TITLE_CACHE_SIZE = 500;
/**
* Caches link titles for a better performance
*
* @var array
*/
private static $title_cache = array();
/**
* Max. number of titles stored in session (older once get removed)
*/
const FILE_ACCESS_CACHE_SIZE = 1000;
/**
* Cache file access permissions
*
* @var array
*/
private static $file_access_cache = array();
/**
* Private constructor to forbid instanciated use
*
*/
private function __construct()
{
}
/**
* initialize our static vars
*
* @param boolean $clear_all do not use session AND not permission check for app-registry
*/
static function init_static($clear_all=false)
{
// FireFox 36 can not display pdf with it's internal viewer in an iframe used by mobile theme/template for popups
// same is true for all mobile devices
if (Header\UserAgent::type() == 'firefox' && $GLOBALS['egw_info']['user']['preferences']['common']['theme'] == 'mobile' ||
Header\UserAgent::mobile())
{
unset(self::$app_register['api']['mime']['application/pdf']);
}
// other apps can participate in the linking by implementing a search_link hook, which
// has to return an array in the format of an app_register entry
// for performance reasons, we do it only once / cache it in the session
if ($clear_all || !($search_link_hooks = Cache::getSession(__CLASS__, 'search_link_hooks')))
{
$search_link_hooks = Hooks::process('search_link',array(), $clear_all || (bool)$GLOBALS['egw_info']['flags']['async-service']);
Cache::setSession(__CLASS__, 'search_link_hooks', $search_link_hooks);
}
if (is_array($search_link_hooks))
{
foreach($search_link_hooks as $app => $data)
{
// allow apps to register additional types
if (isset($data['additional']))
{
foreach($data['additional'] as $name => $values)
{
$values['app'] = $app; // store name of registring app, to be able to check access
self::$app_register[$name] = $values;
}
unset($data['additional']);
}
// support deprecated view_list attribute instead of new index attribute
if (isset($data['view_list']) && !isset($data['list']))
{
$data['list'] = array('menuaction' => $data['view_list']);
}
elseif(isset($data['list']) && !isset($data['view_list']))
{
$data['view_list'] = $data['list']['menuaction'];
}
if (is_array($data))
{
self::$app_register[$app] = $data;
}
}
}
// disable ability to link to accounts for non-admins, if account-selection is disabled
if ($GLOBALS['egw_info']['user']['preferences']['common']['account_selection'] == 'none' &&
!isset($GLOBALS['egw_info']['user']['apps']['admin']))
{
unset(self::$app_register['api-accounts']);
}
if (!(self::$title_cache = Cache::getSession(__CLASS__, 'link_title_cache')))
{
self::$title_cache = array();
}
if (!(self::$file_access_cache = Cache::getSession(__CLASS__, 'link_file_access_cache')))
{
self::$file_access_cache = array();
}
// register self::save_session_cache to run on shutdown
Egw::on_shutdown(array(__CLASS__, 'save_session_cache'));
//error_log(__METHOD__.'() items in title-cache: '.count(self::$title_cache).' file-access-cache: '.count(self::$file_access_cache));
}
/**
* Get clientside relevant attributes from app registry in json format
*
* Only transfering relevant information cuts approx. half of the size.
* Also only transfering information relevant to apps user has access too.
* Important eg. for mime-registry, to not use calendar for opening iCal files, if user has no calendar!
* As app can store additonal types, we have to check the registring app $data['app'] too!
*
* @return string json encoded object with app: object pairs with attributes "(view|add|edit)(|_id|_popup)"
*/
public static function json_registry()
{
$to_json = array();
foreach(self::$app_register as $app => $data)
{
if (isset($GLOBALS['egw_info']['user']['apps'][$app]) ||
isset($data['app']) && isset($GLOBALS['egw_info']['user']['apps'][$data['app']]))
{
$to_json[$app] = array_intersect_key($data, array_flip(array(
'view','view_id','view_popup',
'add','add_app','add_id','add_popup',
'edit','edit_id','edit_popup',
'list','list_popup',
'name','icon','query',
'mime','entry','entries',
)));
}
}
return json_encode($to_json);
}
/**
* Called by Egw::shutdown to store the title-cache in session and run notifications
*
* Would probably better called shutdown as well.
*/
static function save_session_cache()
{
if (isset($GLOBALS['egw']->session)) // eg. cron-jobs use it too, without any session
{
//error_log(__METHOD__.'() items in title-cache: '.count(self::$title_cache).' file-access-cache: '.count(self::$file_access_cache));
if (count(self::$title_cache) > self::TITLE_CACHE_SIZE)
{
self::$title_cache = array_slice(self::$title_cache, -self::TITLE_CACHE_SIZE);
}
Cache::setSession(__CLASS__, 'link_title_cache', self::$title_cache);
if (count(self::$file_access_cache) > self::FILE_ACCESS_CACHE_SIZE)
{
self::$file_access_cache = array_slice(self::$file_access_cache, -self::FILE_ACCESS_CACHE_SIZE);
}
Cache::setSession(__CLASS__, 'link_file_access_cache', self::$file_access_cache);
}
}
/**
* creats a link between $app1,$id1 and $app2,$id2 - $id1 does NOT need to exist yet
*
* Does NOT check if link already exists.
* File-attachments return a negative link-id !!!
*
* @param string $app1 app of $id1
* @param string|array &$id1 id of item to linkto or 0 if item not yet created or array with links
* of not created item or $file-array if $app1 == self::VFS_APPNAME (see below).
* If $id==0 it will be set on return to an array with the links for the new item.
* @param string|array $app2 app of 2.linkend or array with links ($id2 not used)
* @param string $id2 ='' id of 2. item of $file-array if $app2 == self::VFS_APPNAME or self::DATA_APPNAME
* $file array with informations about the file in format of the etemplate file-type
* $file['name'] name of the file (no directory)
* $file['type'] mime-type of the file
* $file['tmp_name'] name of the uploaded file (incl. directory) for self::VFS_APPNAME or
* $file['egw_data'] id of Link::set_data() call for self::DATA_APPNAME
* @param string $remark ='' Remark to be saved with the link (defaults to '')
* @param int $owner =0 Owner of the link (defaults to user)
* @param int $lastmod =0 timestamp of last modification (defaults to now=time())
* @param int $no_notify =0 &1 dont notify $app1, &2 dont notify $app2
* @return int/boolean False (for db or param-error) or on success link_id (Please not the return-value of $id1)
*/
static function link( $app1,&$id1,$app2,$id2='',$remark='',$owner=0,$lastmod=0,$no_notify=0 )
{
if (self::DEBUG)
{
echo "<p>Link::link('$app1',$id1,'".print_r($app2,true)."',".print_r($id2,true).",'$remark',$owner,$lastmod)</p>\n";
}
if (!$app1 || !$app2 || $app1 == $app2 && $id1 == $id2)
{
return False;
}
if (is_array($app2) && !$id2)
{
reset($app2);
$link_id = True;
while ($link_id && $link = current($app2))
{
if (!is_array($link)) // check for unlink-marker
{
//echo "<b>link='$link' is no array</b><br>\n";
next($app2);
continue;
}
if (is_array($id1) || !$id1) // create link only in $id1 array
{
self::link($app1, $id1, $link['app'], $link['id'], $link['remark'],$link['owner'],$link['lastmod']);
next($app2);
continue;
}
switch ($link['app'])
{
case self::DATA_APPNAME:
if (!($link['id']['tmp_name'] = self::get_data($link['id']['egw_data'], true)))
{
$link_id = false;
break;
}
// fall through
case self::VFS_APPNAME:
$link_id = self::attach_file($app1,$id1,$link['id'],$link['remark']);
break;
case self::VFS_LINK:
$link_id = self::link_file($app1,$id1, $link['id'],$link['remark']);
break;
default:
$link_id = Link\Storage::link($app1,$id1,$link['app'],$link['id'],
$link['remark'],$link['owner'],$link['lastmod']);
// notify both sides
if (!($no_notify&2)) self::notify('link',$link['app'],$link['id'],$app1,$id1,$link_id);
if (!($no_notify&1)) self::notify('link',$app1,$id1,$link['app'],$link['id'],$link_id);
break;
}
next($app2);
}
return $link_id;
}
if (is_array($id1) || !$id1) // create link only in $id1 array
{
if (!is_array($id1))
{
$id1 = array( );
}
$link_id = self::temp_link_id($app2,$id2);
$id1[$link_id] = array(
'app' => $app2,
'id' => $id2,
'remark' => $remark,
'owner' => $owner,
'link_id' => $link_id,
'lastmod' => time()
);
if (self::DEBUG)
{
_debug_array($id1);
}
return $link_id;
}
if ($app1 == self::VFS_LINK)
{
return self::link_file($app2,$id2,$id1,$remark);
}
elseif ($app2 == self::VFS_LINK)
{
return self::link_file($app1,$id1,$id2,$remark);
}
if ($app1 == self::VFS_APPNAME)
{
return self::attach_file($app2,$id2,$id1,$remark);
}
elseif ($app2 == self::VFS_APPNAME)
{
return self::attach_file($app1,$id1,$id2,$remark);
}
$link_id = Link\Storage::link($app1,$id1,$app2,$id2,$remark,$owner);
if (!($no_notify&2)) self::notify('link',$app2,$id2,$app1,$id1,$link_id);
if (!($no_notify&1)) self::notify('link',$app1,$id1,$app2,$id2,$link_id);
return $link_id;
}
/**
* generate temporary link_id used as array-key
*
* @param string $app app-name
* @param mixed $id
* @return string
*/
static function temp_link_id($app,$id)
{
return $app.':'.(!in_array($app, array(self::VFS_APPNAME,self::VFS_LINK, self::DATA_APPNAME)) ? $id : $id['name']);
}
/**
* returns array of links to $app,$id (reimplemented to deal with not yet created items)
*
* @param string $app appname
* @param string|array $id id(s) in $app
* @param string $only_app ='' if set return only links from $only_app (eg. only addressbook-entries) or NOT from if $only_app[0]=='!'
* @param string $order ='link_lastmod DESC' defaults to newest links first
* @param boolean $cache_titles =false should all titles be queryed and cached (allows to query each link app only once!)
* This option also removes links not viewable by current user from the result!
* @param boolean $deleted =false Include links that have been flagged as deleted, waiting for purge of linked record.
* @param int $limit =null number of entries to return, only affects links, attachments are allways reported!
* @return array id => links pairs if $id is an array or just the links (only_app: ids) or empty array if no matching links found
*/
static function get_links($app, $id, $only_app='', $order='link_lastmod DESC',$cache_titles=false, $deleted=false, $limit=null)
{
if (self::DEBUG) echo "<p>Link::get_links(app='$app',id='$id',only_app='$only_app',order='$order',deleted='$deleted')</p>\n";
if (is_array($id) || !$id)
{
$ids = array();
if (is_array($id))
{
if (($not_only = $only_app[0] == '!'))
{
$only_app = substr(1,$only_app);
}
foreach (array_reverse($id) as $link)
{
if (is_array($link) // check for unlink-marker
&& !($only_app && $not_only == ($link['app'] == $only_app)))
{
$ids[$link['link_id']] = $only_app ? $link['id'] : $link;
}
}
}
return $ids;
}
$ids = Link\Storage::get_links($app, $id, $only_app, $order, $deleted, $limit);
if (empty($only_app) || $only_app == self::VFS_APPNAME ||
($only_app[0] == '!' && $only_app != '!'.self::VFS_APPNAME))
{
if (($vfs_ids = self::list_attached($app,$id)))
{
$ids += $vfs_ids;
}
}
//echo "ids=<pre>"; print_r($ids); echo "</pre>\n";
if ($cache_titles)
{
// agregate links by app
$app_ids = array();
foreach($ids as $link)
{
$app_ids[$link['app']][] = $link['id'];
}
foreach($app_ids as $appname => $a_ids)
{
self::titles($appname,array_unique($a_ids));
}
// remove links, current user has no access, from result
foreach($ids as $key => $link)
{
if (!self::title($link['app'],$link['id']))
{
unset($ids[$key]);
}
}
reset($ids);
}
return $ids;
}
/**
* Query the links of multiple entries of one application
*
* @ToDo also query the attachments in a single query, eg. via a directory listing of /apps/$app
* @param string $app
* @param array $ids
* @param boolean $cache_titles =true should all titles be queryed and cached (allows to query each link app only once!)
* @param string $only_app if set return only links from $only_app (eg. only addressbook-entries) or NOT from if $only_app[0]=='!'
* @param string $order ='link_lastmod DESC' defaults to newest links first
* @param boolean $deleted =false Include links that have been flagged as deleted, waiting for purge of linked record.
* @return array of $id => array($links) pairs
*/
static function get_links_multiple($app,array $ids,$cache_titles=true,$only_app='',$order='link_lastmod DESC', $deleted=false )
{
if (self::DEBUG) echo "<p>".__METHOD__."('$app',".print_r($ids,true).",$cache_titles,'$only_app','$order')</p>\n";
if (!$ids)
{
return array(); // no ids are linked to nothing
}
$links = Link\Storage::get_links($app,$ids,$only_app,$order,$deleted);
if (empty($only_app) || $only_app == self::VFS_APPNAME ||
($only_app[0] == '!' && $only_app != '!'.self::VFS_APPNAME))
{
// todo do that in a single query, eg. directory listing, too
foreach($ids as $id)
{
if (!isset($links[$id]))
{
$links[$id] = array();
}
if (($vfs_ids = self::list_attached($app,$id)))
{
$links[$id] += $vfs_ids;
}
}
}
if ($cache_titles)
{
// agregate links by app
$app_ids = array();
foreach($links as &$targets)
{
foreach($targets as $link)
{
if (is_array($link)) $app_ids[$link['app']][] = $link['id'];
}
}
foreach($app_ids as $a_app => $a_ids)
{
self::titles($a_app,array_unique($a_ids));
}
}
return $links;
}
/**
* Read one link specified by it's link_id or by the two end-points
*
* If $id is an array (links not yet created) only link_ids are allowed.
*
* @param int|string $app_link_id > 0 link_id of link or app-name of link
* @param string|array $id ='' id if $app_link_id is an appname or array with links, if 1. entry not yet created
* @param string $app2 ='' second app
* @param string $id2 ='' id in $app2
* @return array with link-data or False
*/
static function get_link($app_link_id,$id='',$app2='',$id2='')
{
if (self::DEBUG)
{
echo '<p>'.__METHOD__."($app_link_id,$id,$app2,$id2)</p>\n"; echo function_backtrace();
}
if (is_array($id))
{
if (strpos($app_link_id,':') === false) $app_link_id = self::temp_link_id($app2,$id2); // create link_id of temporary link, if not given
if (isset($id[$app_link_id]) && is_array($id[$app_link_id])) // check for unlinked-marker
{
return $id[$app_link_id];
}
return False;
}
if ((int)$app_link_id < 0 || $app_link_id == self::VFS_APPNAME || $app2 == self::VFS_APPNAME)
{
if ((int)$app_link_id < 0) // vfs link_id ?
{
return self::fileinfo2link(-$app_link_id);
}
if ($app_link_id == self::VFS_APPNAME)
{
return self::info_attached($app2,$id2,$id);
}
return self::info_attached($app_link_id,$id,$id2);
}
return Link\Storage::get_link($app_link_id,$id,$app2,$id2);
}
/**
* Remove link with $link_id or all links matching given $app,$id
*
* Note: if $link_id != '' and $id is an array: unlink removes links from that array only
* unlink has to be called with &$id to see the result (depricated) or unlink2 has to be used !!!
*
* @param $link_id link-id to remove if > 0
* @param string $app ='' appname of first endpoint
* @param string|array $id ='' id in $app or array with links, if 1. entry not yet created
* @param int $owner =0 account_id to delete all links of a given owner, or 0
* @param string $app2 ='' app of second endpoint
* @param string $id2 ='' id in $app2
* @param boolean $hold_for_purge Don't really delete the link, just mark it as deleted and wait for final delete
* @return the number of links deleted
*/
static function unlink($link_id,$app='',$id='',$owner=0,$app2='',$id2='',$hold_for_purge=false)
{
return self::unlink2($link_id,$app,$id,$owner,$app2,$id2,$hold_for_purge);
}
/**
* Remove link with $link_id or all links matching given $app,$id
*
* @param $link_id link-id to remove if > 0
* @param string $app ='' appname of first endpoint
* @param string|array &$id='' id in $app or array with links, if 1. entry not yet created
* @param int $owner =0 account_id to delete all links of a given owner, or 0
* @param string $app2 ='' app of second endpoint, or !file (other !app are not yet supported!)
* @param string $id2 ='' id in $app2
* @param boolean $hold_for_purge Don't really delete the link, just mark it as deleted and wait for final delete
* @return the number of links deleted
*/
static function unlink2($link_id,$app,&$id,$owner=0,$app2='',$id2='',$hold_for_purge=false)
{
if (self::DEBUG)
{
echo "<p>Link::unlink('$link_id','$app',".array2string($id).",'$owner','$app2','$id2', $hold_for_purge)</p>\n";
}
if ($link_id < 0) // vfs-link?
{
return self::delete_attached(-$link_id);
}
elseif ($app == self::VFS_APPNAME)
{
return self::delete_attached($app2,$id2,$id);
}
elseif ($app2 == self::VFS_APPNAME)
{
return self::delete_attached($app,$id,$id2);
}
if (!is_array($id))
{
if (!$link_id && !$app2 && !$id2 && $app2 != '!'.self::VFS_APPNAME)
{
// in case "someone" interested in all changes (used eg. for push)
Hooks::process([
'location' => 'notify-all',
'type' => 'delete',
'app' => $app,
'id' => $id,
], null, true);
self::delete_attached($app,$id); // deleting all attachments
self::delete_cache($app,$id);
}
// Log in history
if($link_id && (!$app || !$app2))
{
// Need to load it first
$link = self::get_link($link_id);
$app = $link['link_app1'];
$id = $link['link_id1'];
$app2 = $link['link_app2'];
$id2 = $link['link_id2'];
}
if ($app && $app2)
{
Storage\History::static_add($app,$id,$GLOBALS['egw_info']['user']['account_id'],'~link~','',$app2.':'.$id2);
Storage\History::static_add($app2,$id2,$GLOBALS['egw_info']['user']['account_id'],'~link~','',$app.':'.$id);
}
$deleted = Link\Storage::unlink($link_id,$app,$id,$owner,$app2 != '!'.self::VFS_APPNAME ? $app2 : '',$id2,$hold_for_purge);
// only notify on real links, not the one cached for writing or fileattachments
self::notify_unlink($deleted);
return count($deleted);
}
if (!$link_id) $link_id = self::temp_link_id($app2,$id2); // create link_id of temporary link, if not given
if (isset($id[$link_id]))
{
$id[$link_id] = False; // set the unlink marker
if (self::DEBUG)
{
_debug_array($id);
}
return True;
}
return False;
}
/**
* get list/array of link-aware apps the user has rights to use
*
* @param string $must_support capability the apps need to support, eg. 'add', default ''=list all apps
* @return array with app => title pairs
*/
static function app_list($must_support='')
{
$apps = array();
foreach(self::$app_register as $type => $reg)
{
if ($must_support && !isset($reg[$must_support])) continue;
list($app) = explode('-', $type);
if ($GLOBALS['egw_info']['user']['apps'][$app])
{
$apps[$type] = lang(self::get_registry($type, 'name'));
}
}
return $apps;
}
/**
* Searches for a $pattern in the entries of $app
*
* @param string $app app to search
* @param string $pattern pattern to search
* @param array& $options passed to callback: type, start, num_rows, filter, exclude; on return value for "total"
* @return array with $id => $title pairs of matching entries of app
*/
static function query($app, $pattern, &$options = array())
{
if ($app == '' || !is_array($reg = self::$app_register[$app]) || !isset($reg['query']))
{
return array();
}
$method = $reg['query'];
if (self::DEBUG)
{
echo "<p>Link::query('$app','$pattern') => '$method'</p>\n";
echo "Options: "; _debug_array($options);
}
$result = self::exec($method, array($pattern, &$options));
if (!isset($options['total']))
{
$options['total'] = count($result);
}
if (isset($options['exclude']))
{
$result = array_diff_key($result, array_flip($options['exclude']));
}
if (is_array($result) && (isset($options['start']) || (isset($options['num_rows']) && count($result) > $options['num_rows'])))
{
$result = array_slice($result, $options['start'], (isset($options['num_rows']) ? $options['num_rows'] : count($result)), true);
}
return $result;
}
/**
* returns the title (short description) of entry $id and $app
*
* @param string $app appname
* @param string $id id in $app
* @param array $link =null link-data for file-attachments
* @return string/boolean string with title, null if $id does not exist in $app or false if no perms to view it
*/
static function title($app,$id,$link=null)
{
if (!$id) return '';
$title =& self::get_cache($app,$id);
if (isset($title) && !empty($title) && !is_array($id))
{
if (self::DEBUG) echo '<p>'.__METHOD__."('$app','$id')='$title' (from cache)</p>\n";
return $title;
}
if ($app == self::VFS_APPNAME)
{
if (is_array($id) && $link)
{
$link = $id;
$title = Vfs::decodePath($link['name']);
}
else
{
$title = $id;
}
/* disabling mime-type and size in link-title of attachments, as it clutters the UI
and users dont need it most of the time. These details can allways be views in filemanager.
if (is_array($link))
{
$title .= ': '.$link['type'] . ' '.Vfs::hsize($link['size']);
}*/
if (self::DEBUG) echo '<p>'.__METHOD__."('$app','$id')='$title' (file)</p>\n";
return $title;
}
if ($app == '' || !is_array($reg = self::$app_register[$app]) || !isset($reg['title']))
{
if (self::DEBUG) echo "<p>".__METHOD__."('$app','$id') something is wrong!!!</p>\n";
return false; //array(); // not sure why it should return an array on failure, as the description states boolean/string
}
$method = $reg['title'];
if (true) $title = self::exec($method, array($id));
if ($id && is_null($title)) // $app,$id has been deleted ==> unlink all links to it
{
static $unlinking = array();
// check if we are already trying to unlink the entry, to avoid an infinit recursion
if (!isset($unlinking[$app]) || !isset($unlinking[$app][$id]))
{
$unlinking[$app][$id] = true;
self::unlink(0,$app,$id);
unset($unlinking[$app][$id]);
}
if (self::DEBUG) echo '<p>'.__METHOD__."('$app','$id') unlinked, as $method returned null</p>\n";
return False;
}
if (self::DEBUG) echo '<p>'.__METHOD__."('$app','$id')='$title' (from $method)</p>\n";
return $title;
}
/**
* Maximum number of titles to query from an application at once (to NOT trash mysql)
*/
const MAX_TITLES_QUERY = 100;
/**
* Query the titles off multiple id's of one app
*
* Apps can implement that hook, if they have a quicker (eg. less DB queries) method to query the title of multiple entries.
* If it's not implemented, we call the regular title method multiple times.
*
* @param string $app
* @param array $ids
*/
static function titles($app,array $ids)
{
if (self::DEBUG)
{
echo "<p>".__METHOD__."($app,".implode(',',$ids).")</p>\n";
}
$titles = $ids_to_query = array();
foreach($ids as $id)
{
$title =& self::get_cache($app,$id);
if (!isset($title))
{
if (isset(self::$app_register[$app]['titles']))
{
$ids_to_query[] = $id; // titles method --> collect links to query at once
}
else
{
$title = self::title($app,$id); // no titles method --> fallback to query each link separate
}
}
$titles[$id] = $title;
}
if ($ids_to_query)
{
for ($n = 0; ($ids = array_slice($ids_to_query,$n*self::MAX_TITLES_QUERY,self::MAX_TITLES_QUERY)); ++$n)
{
foreach(self::exec(self::$app_register[$app]['titles'], array($ids)) as $id => $t)
{
$title =& self::get_cache($app,$id);
$titles[$id] = $title = $t;
}
}
}
return $titles;
}
/**
* Add new entry to $app, evtl. already linked to $to_app, $to_id
*
* @param string $app appname of entry to create
* @param string $to_app ='' appname to link the new entry to
* @param string $to_id =''id in $to_app
* @return array/boolean with name-value pairs for link to add-methode of $app or false if add not supported
*/
static function add($app,$to_app='',$to_id='')
{
//echo "<p>Link::add('$app','$to_app','$to_id') app_register[$app] ="; _debug_array($app_register[$app]);
if ($app == '' || !is_array($reg = self::$app_register[$app]) || !isset($reg['add']))
{
return false;
}
$params = $reg['add'];
if ($reg['add_app'] && $to_app && $reg['add_id'] && $to_id)
{
$params[$reg['add_app']] = $to_app;
$params[$reg['add_id']] = $to_id;
}
return $params;
}
/**
* Edit entry $id of $app
*
* @param string $app appname of entry
* @param string $id id in $app
* @param string &$popup=null on return popup size eg. '600x400' or null
* @return array|boolean with name-value pairs for link to edit-methode of $app or false if edit not supported
*/
static function edit($app,$id,&$popup=null)
{
//echo "<p>Link::add('$app','$to_app','$to_id') app_register[$app] ="; _debug_array($app_register[$app]);
if (empty($app) || empty($id) || !is_array($reg = self::$app_register[$app]) || !isset($reg['edit']))
{
if ($reg && isset($reg['view']))
{
$popup = $reg['view_popup'];
return self::view($app,$id); // fallback to view
}
return false;
}
$params = $reg['edit'];
$params[$reg['edit_id']] = $id;
$popup = $reg['edit_popup'];
return $params;
}
/**
* view entry $id of $app
*
* @param string $app appname
* @param string $id id in $app
* @param array $link =null link-data for file-attachments
* @return array with name-value pairs for link to view-methode of $app to view $id
*/
static function view($app,$id,$link=null)
{
if ($app == self::VFS_APPNAME && !empty($id) && is_array($link))
{
//return Vfs::download_url(self::vfs_path($link['app2'],$link['id2'],$link['id'],true));
return self::mime_open(self::vfs_path($link['app2'],$link['id2'],$link['id'],true), $link['type']);
}
if ($app == '' || !is_array($reg = self::$app_register[$app]) || !isset($reg['view']) || !isset($reg['view_id']))
{
return array();
}
$view = $reg['view'];
$names = explode(':',$reg['view_id']);
if (count($names) > 1)
{
$id = explode(':',$id);
foreach($names as $n => $name)
{
$view[$name] = $id[$n];
}
}
else
{
$view[$reg['view_id']] = $id;
}
return $view;
}
/**
* Get mime-type information from app-registry
*
* Only return information from apps the user has access too (incl. registered sub-types of that apps).
*
* We prefer full matches over wildcards like "text/*" written as regexp "/^text\\//".
*
* @param string $type
* @return array with values for keys 'menuaction', 'mime_id' (path) or 'mime_url' and options 'mime_popup' and other values to pass one
*/
static function get_mime_info($type)
{
foreach(self::$app_register as $app => $registry)
{
if (isset($registry['mime']) &&
(isset($GLOBALS['egw_info']['user']['apps'][$app]) ||
isset($registry['app']) && isset($GLOBALS['egw_info']['user']['apps'][$registry['app']])))
{
foreach($registry['mime'] as $mime => $data)
{
if ($mime == $type) return $data;
if ($mime[0] == '/' && preg_match($mime.'i', $type))
{
$wildcard_mime = $data;
}
}
}
}
return isset($wildcard_mime) ? $wildcard_mime : null;
}
/**
* Get handler (link-data) for given path and mime-type
*
* @param string $path vfs path
* @param string $type =null default to Vfs::mime_content_type($path)
* @param string &$popup=null on return popup size or null
* @return string|array string with EGw relative link, array with get-parameters for '/index.php' or null (directory and not filemanager access)
*/
static function mime_open($path, $type=null, &$popup=null)
{
if (is_null($type)) $type = Vfs::mime_content_type($path);
if (($data = self::get_mime_info($type)))
{
if (isset($data['mime_url']))
{
$data[$data['mime_url']] = Vfs::PREFIX.$path;
unset($data['mime_url']);
}
elseif (isset($data['mime_id']))
{
$data[$data['mime_id']] = $path;
unset($data['mime_id']);
}
elseif(isset($data['mime_popup']))
{
$popup = $data['mime_popup'];
}
else
{
throw new Exception\AssertionFailed("Missing 'mime_id' or 'mime_url' for mime-type '$type'!");
}
unset($data['mime_popup']);
}
else
{
$data = Vfs::download_url($path);
}
return $data;
}
/**
* Check if $app uses a popup for $action
*
* @param string $app app-name
* @param string $action ='view' name of the action, atm. 'view' or 'add'
* @param array $link =null link-data for file-attachments
* @return boolean|string false if no popup is used or $app is not registered, otherwise string with the prefered popup size (eg. '640x400)
*/
static function is_popup($app, $action='view', $link=null)
{
$popup = self::get_registry($app,$action.'_popup');
// for files/attachments check mime-registry
if ($app == self::VFS_APPNAME && is_array($link) && !empty($link['type']))
{
$path = self::vfs_path($link['app2'], $link['id2'], $link['id'], true);
$p = null;
if (self::mime_open($path, $link['type'], $p))
{
$popup = $p;
}
}
//error_log(__METHOD__."('$app', '$action', ".array2string($link).') returning '.array2string($popup));
return $popup;
}
/**
* Check if $app is in the registry and has an entry for $name
*
* @param string $app app-name
* @param string $name name / key in the registry, eg. 'view'
* @return boolean|string false if $app is not registered, otherwise string with the value for $name
*/
static function get_registry($app,$name)
{
$reg = self::$app_register[$app];
if (!isset($reg)) return false;
if (!isset($reg[$name])) // some defaults
{
switch($name)
{
case 'name':
$reg[$name] = $app;
break;
case 'entry':
$reg[$name] = $app;
break;
case 'icon':
if (isset($GLOBALS['egw_info']['apps'][$app]['icon']))
{
$reg[$name] = ($GLOBALS['egw_info']['apps'][$app]['icon_app'] ? $GLOBALS['egw_info']['apps'][$app]['icon_app'] : $app).
'/'.$GLOBALS['egw_info']['apps'][$app]['icon'];
}
else
{
$reg[$name] = $app.'/navbar';
}
break;
}
}
return isset($reg) ? $reg[$name] : false;
}
/**
* path to the attached files of $app/$ip or the directory for $app if no $id,$file given
*
* All link-files are based in the vfs-subdir '/apps/'.$app
*
* @param string $app appname
* @param string $id ='' id in $app
* @param string $file ='' filename
* @param boolean $just_the_path =false return url or just the vfs path
* @return string/array path or array with path and relatives, depending on $relatives
*/
static function vfs_path($app,$id='',$file='',$just_the_path=false)
{
$path = self::VFS_BASEURL;
if ($app)
{
if( isset(self::$app_register[$app]) ) {
$reg = self::$app_register[$app];
if( isset($reg['file_dir']) ) {
$app = $reg['file_dir'];
}
}
$path .= '/'.$app;
if ($id)
{
$path .= '/'.$id;
if ($file)
{
$path .= '/'.$file;
}
}
}
if ($just_the_path)
{
$path = parse_url($path,PHP_URL_PATH);
}
else
{
$path = Vfs::resolve_url($path);
}
//error_log(__METHOD__."($app,$id,$file,$just_the_path)=$path");
return $path;
}
/**
* Put a file to the corrosponding place in the VFS and set the attributes
*
* Does NO is_uploaded_file check, calling application is responsible for doing that for uploaded files!
*
* @param string $app appname to linke the file to
* @param string $id id in $app
* @param array $file informations about the file in format of the etemplate file-type
* $file['name'] name of the file (optional incl. a directory)
* $file['type'] mine-type of the file
* $file['tmp_name'] name of the uploaded file (incl. directory) or resource of opened file
* @param string $comment ='' comment to add to the link
* @return int negative id of egw_sqlfs table as negative link-id's are for vfs attachments
*/
static function attach_file($app,$id,$file,$comment='')
{
// check if $file['name'] specifies a subdirectory, in which case use and, if necessary, create it
if (is_array($file) && strpos($file['name'], '/') && strpos($file['name'], '..') === false)
{
$entry_dir = self::vfs_path($app, $id, Vfs::dirname($file['name']));
$file['name'] = Vfs::basename($file['name']);
}
else
{
$entry_dir = self::vfs_path($app,$id);
}
if (self::DEBUG)
{
echo "<p>attach_file: app='$app', id='$id', tmp_name='$file[tmp_name]', name='$file[name]', size='$file[size]', type='$file[type]', path='$file[path]', ip='$file[ip]', comment='$comment', entry_dir='$entry_dir'</p>\n";
}
if (file_exists($entry_dir) || ($Ok = mkdir($entry_dir,0,true)))
{
$Ok = Vfs::copy_uploaded($file, $p=Vfs::parse_url($entry_dir, PHP_URL_PATH), $comment, false); // no is_uploaded_file() check!
if (!$Ok) error_log(__METHOD__."('$app', '$id', ".array2string($file).", '$comment') called Vfs::copy_uploaded('$file[tmp_name]', '$p', '$comment', false)=".array2string($Ok));
}
else
{
error_log(__METHOD__."($app,$id,".array2string($file).",$comment) Can't mkdir $entry_dir!");
}
return $Ok ? -$Ok['ino'] : false;
}
/**
* Links the entry to an existing file in the VFS
*
* @param string $app appname to link the file to
* @param string $id id in $app
* @param string $file VFS path to link to
* @return boolean true on success, false on failure
*/
static function link_file($app,$id,$file)
{
// Don't try to link into app dir if there is no id
if(!$id) return;
if (!Vfs::stat($file))
{
error_log(__METHOD__. ' (Link target ' . Vfs::decodePath($file) . ' not found!');
return false;
}
$entry_dir = self::vfs_path($app, $id);
if (!file_exists($entry_dir) && !mkdir($entry_dir, 0, true))
{
error_log(__METHOD__."($app,$id,".array2string($file).") Can't mkdir $entry_dir!");
return false;
}
return Vfs::symlink($file, Vfs::concat($entry_dir, Vfs::basename($file)));
}
/**
* deletes a single or all attached files of an entry (for all there's no acl check, as the entry probably not exists any more!)
*
* @param int|string $app > 0: file_id of an attchemnt or $app/$id entry which linked to
* @param string $id ='' id in app
* @param string $fname ='' filename
* @return boolean|array false on error ($app or $id not found), array with path as key and boolean result of delete
*/
static function delete_attached($app,$id='',$fname='')
{
if ((int)$app > 0) // is file_id
{
$url = Vfs::resolve_url(Vfs\Sqlfs\StreamWrapper::id2path($app));
}
else
{
if (empty($app) || empty($id))
{
return False; // dont delete more than all attachments of an entry
}
$url = self::vfs_path($app,$id,$fname);
if (!$fname || !$id) // we delete the whole entry (or all entries), which probably not exist anymore
{
$current_is_root = Vfs::$is_root;
Vfs::$is_root = true;
}
}
if (self::DEBUG)
{
echo '<p>'.__METHOD__."('$app','$id','$fname') url=$url</p>\n";
}
// Log in history - Need to load it first
if((int)$app > 0)
{
$link = self::get_link(-$app);
if($link['app2'] && $link['id2'])
{
Storage\History::static_add($link['app2'],$link['id2'],$GLOBALS['egw_info']['user']['account_id'],'~file~','', Vfs::basename($url));
}
}
if (($Ok = !file_exists($url) || Vfs::remove($url,true)) && ((int)$app > 0 || $fname))
{
// try removing the dir, in case it's empty
if (($dir = Vfs::dirname($url))) @Vfs::rmdir($dir);
}
if (!is_null($current_is_root))
{
Vfs::$is_root = $current_is_root;
}
return $Ok;
}
/**
* converts the infos vfs has about a file into a link
*
* @param string $app appname
* @param string $id id in app
* @param string $filename filename
* @return array 'kind' of link-array
*/
static function info_attached($app,$id,$filename)
{
$path = self::vfs_path($app,$id,$filename,true);
if (!($stat = Vfs::stat($path,STREAM_URL_STAT_QUIET)))
{
return false;
}
return self::fileinfo2link($stat,$path);
}
/**
* converts a fileinfo (row in the vfs-db-table) in a link
*
* @param array|int $fileinfo a row from the vfs-db-table (eg. returned by the vfs ls static function) or a file_id of that table
* @return array a 'kind' of link-array
*/
static function fileinfo2link($fileinfo,$url=null)
{
if (!is_array($fileinfo))
{
$url = Vfs\Sqlfs\StreamWrapper::id2path($fileinfo);
if (!($fileinfo = Vfs::stat($url,STREAM_URL_STAT_QUIET)))
{
return false;
}
}
$up = explode('/',$url[0] == '/' ? $url : parse_url($url,PHP_URL_PATH)); // /apps/$app/$id
$app = null;
foreach( self::$app_register as $tapp => $reg ) {
if( isset($reg['file_dir']) ) {
$lup = $up;
unset($lup[0]);
unset($lup[1]);
reset($lup);
$fdp = explode('/',$reg['file_dir'][0] == '/' ?
$reg['file_dir'] : parse_url($reg['file_dir'],PHP_URL_PATH));
$found = true;
foreach( $fdp as $part ) {
if( current($lup) == $part ) {
if( next($lup) === false ) {
$found = false;
break;
}
}
else {
$found = false;
break;
}
}
if( $found ) {
$id = current($lup);
$app = $tapp;
break;
}
}
}
if( $app === null ) {
list(,,$app,$id) = $up;
}
return array(
'app' => self::VFS_APPNAME,
'id' => $fileinfo['name'],
'app2' => $app,
'id2' => $id,
'remark' => '', // only list_attached currently sets the remark
'owner' => $fileinfo['uid'],
'link_id' => -$fileinfo['ino'],
'lastmod' => $fileinfo['mtime'],
'size' => $fileinfo['size'],
'type' => $fileinfo['mime'],
);
}
/**
* lists all attachments to $app/$id
*
* @param string $app appname
* @param string $id id in app
* @return array with link_id => 'kind' of link-array pairs
*/
static function list_attached($app,$id)
{
$path = self::vfs_path($app,$id);
//error_log(__METHOD__."($app,$id) url=$url");
if (!($extra = self::get_registry($app,'find_extra'))) $extra = array();
// always use regular links stream wrapper here: extended one is unnecessary (slow) for just listing attachments
if (substr($path,0,13) == 'stylite.links') $path = substr($path,8);
$attached = array();
if (($url2stats = Vfs::find($path,array('need_mime'=>true,'type'=>'F','url'=>true)+$extra,true)))
{
$props = Vfs::propfind(array_keys($url2stats)); // get the comments
foreach($url2stats as $url => &$fileinfo)
{
$link = self::fileinfo2link($fileinfo,$url);
if ($props && isset($props[$url]))
{
foreach($props[$url] as $prop)
{
if ($prop['ns'] == Vfs::DEFAULT_PROP_NAMESPACE && $prop['name'] == 'comment')
{
$link['remark'] = $prop['val'];
}
}
}
$attached[$link['link_id']] = $link;
}
}
return $attached;
}
/**
* reverse static function of htmlspecialchars()
*
* @param string $str string to decode
* @return string decoded string
*/
static private function decode_htmlspecialchars($str)
{
return str_replace(array('&amp;','&quot;','&lt;','&gt;'),array('&','"','<','>'),$str);
}
/**
* Key for old link title in $data param to Link::notify
*/
const OLD_LINK_TITLE = 'old_link_title';
/**
* notify other apps about changed content in $app,$id
*
* To give other apps the possebility to update a title, you can also specify
* a changed old link-title in $data[Link::OLD_LINK_TITLE].
*
* @param string $app name of app in which the updated happend
* @param string $id id in $app of the updated entry
* @param array $data =null updated data of changed entry, as the read-method of the BO-layer would supply it
* @param string $type ="unknown" type of update: "add", "edit", "update" or default "unknown"
*/
static function notify_update($app,$id,$data=null,$type='unknown')
{
self::delete_cache($app,$id);
//error_log(__METHOD__."('$app', $id, $data)");
foreach(self::get_links($app,$id,'!'.self::VFS_APPNAME) as $link_id => $link)
{
self::notify('update',$link['app'],$link['id'],$app,$id,$link_id,$data);
}
if($data[Link::OLD_LINK_TITLE] && Json\Response::isJSONResponse())
{
// Update client side with new title
Json\Response::get()->apply('egw.link_title_callback',array(array($app => array($id => self::title($app, $id)))));
}
// in case "someone" interested in all changes (used eg. for push)
Hooks::process([
'location' => 'notify-all',
'type' => !empty($data[Link::OLD_LINK_TITLE]) ? 'update' : $type,
'app' => $app,
'id' => $id,
'data' => $data,
], null, true);
}
/**
* Stores notifications to run after regular processing is done
*
* @var array
*/
private static $notifies = array();
/**
* notify an application about a new or deleted links to own entries or updates in the content of the linked entry
*
* Please note: not all apps supply update notifications
*
* @internal
* @param string $type 'link' for new links, 'unlink' for unlinked entries, 'update' of content in linked entries
* @param string $notify_app app to notify
* @param string $notify_id id in $notify_app
* @param string $target_app name of app whos entry changed, linked or deleted
* @param string $target_id id in $target_app
* @param array $data =null data of entry in app2 (optional)
*/
static private function notify($type,$notify_app,$notify_id,$target_app,$target_id,$link_id,$data=null)
{
//error_log(__METHOD__."('$type', '$notify_app', $notify_id, '$target_app', $target_id, $link_id, $data)");
if ($link_id && isset(self::$app_register[$notify_app]) && isset(self::$app_register[$notify_app]['notify']))
{
if (!self::$notifies)
{
Egw::on_shutdown(array(__CLASS__, 'run_notifies'));
}
self::$notifies[] = array(
'method' => self::$app_register[$notify_app]['notify'],
'type' => $type,
'id' => $notify_id,
'target_app' => $target_app,
'target_id' => $target_id,
'link_id' => $link_id,
'data' => $data,
);
}
}
/**
* Run notifications called by Egw::on_shutdown(), after regular processing is finished
*/
static public function run_notifies()
{
//error_log(__METHOD__."() count(self::\$notifies)=".count(self::$notifies));
while(self::$notifies)
{
$args = array_shift(self::$notifies);
$method = $args['method'];
unset($args['method']);
//error_log(__METHOD__."() calling $method(".array2string($args).')');
self::exec($method, array($args));
}
}
/**
* notifies about unlinked links
*
* @internal
* @param array &$links unlinked links from the database
*/
static private function notify_unlink(&$links)
{
foreach($links as $link)
{
// we notify both sides of the link, as the unlink command NOT clearly knows which side initiated the unlink
self::notify('unlink',$link['link_app1'],$link['link_id1'],$link['link_app2'],$link['link_id2'],$link['link_id']);
self::notify('unlink',$link['link_app2'],$link['link_id2'],$link['link_app1'],$link['link_id1'],$link['link_id']);
}
}
/**
* Get a reference to the cached value for $app/$id for $type
*
* @param string $app
* @param string|int $id
* @param string $type ='title' 'title' or 'file_access'
* @return int|string can be null, if cache not yet set
*/
private static function &get_cache($app,$id,$type = 'title')
{
switch($type)
{
case 'title':
if ($app == self::VFS_APPNAME)
{
return null; // do not cache file titles, they are just the names
}
return self::$title_cache[$app.':'.$id];
case 'file_access':
return self::$file_access_cache[$app.':'.$id];
default:
throw new Exception\WrongParameter("Unknown type '$type'!");
}
}
/**
* Set title and optional file_access cache for $app,$id
*
* Allows applications to set values for title and file access, eg. in their search method,
* to not be called again. This offloads the need to cache from the app to the link class.
* If there's no caching, items get read multiple times from the database!
*
* @param string $app
* @param int|string $id
* @param string $title title string or null
* @param int $file_access =null Acl::READ, Acl::EDIT or both or'ed together
*/
public static function set_cache($app,$id,$title,$file_access=null)
{
//error_log(__METHOD__."($app,$id,$title,$file_access)");
// do not cache file titles, they are just the names
if (!is_null($title) && $app != self::VFS_APPNAME)
{
self::$title_cache[$app.':'.$id] = $title;
}
if (!is_null($file_access))
{
self::$file_access_cache[$app.':'.$id] = $file_access;
}
}
/**
* Delete the diverse caches for $app/$id
*
* @param string $app app-name or null to delete the whole cache
* @param int|string $id id or null to delete only file_access cache of given app (keeps title cache, if app implements file_access!)
*/
private static function delete_cache($app,$id)
{
unset(self::$title_cache[$app.':'.$id]);
unset(self::$file_access_cache[$app.':'.$id]);
}
/**
* Store function call and parameters in session and return id to retrieve it result
*
* @param string $mime_type
* @param string $method
* @param array $params
* @param boolean $ignore_mime =false true: return id, even if nothing registered for given mime-type
* @return string|null md5 hash of stored data of server-side supported mime-type or null otherwise
*/
public static function set_data($mime_type, $method, array $params, $ignore_mime=false)
{
if (!$ignore_mime && (!($info = self::get_mime_info($mime_type)) || empty($info['mime_data'])))
{
return null;
}
array_unshift($params, $method);
$id = md5(serialize($params));
//error_log(__METHOD__."('$mime_type', '$method', ...) params=".array2string($params)." --> json=".array2string(serialize($params)).' --> id='.array2string($id));
Cache::setSession(__CLASS__, $id, $params);
return $id;
}
/**
* Call stored function with parameters and return result
*
* @param string $id
* @param boolean $return_resource =false false: return string, true: return resource
* @return mixed null if id is not found or invalid
* @throws Exception\WrongParameter
*/
public static function get_data($id, $return_resource=false)
{
$data = Cache::getSession(__CLASS__, $id);
if (!isset($data) || empty($data[0]))
{
throw new Exception\WrongParameter(__METHOD__."('$id')");
}
$method = array_shift($data);
$ret = self::exec($method, $data);
if (is_resource($ret)) fseek($ret, 0);
if ($return_resource != is_resource($ret))
{
if ($return_resource && ($fp = fopen('php://temp', 'w')))
{
fwrite($fp, $ret);
fseek($fp, 0);
$ret = $fp;
}
if (!$return_resource)
{
$fp = $ret;
$ret = '';
while(!feof($fp))
{
$ret .= fread($fp, 8192);
}
fclose($fp);
}
}
//error_log(__METHOD__."('$id') returning ".gettype($ret).'='.array2string($ret));
return $ret;
}
/**
* Check the file access perms for $app/id and given user $user
*
* If $user given and != current user AND app does not set file_access_user=true,
* allways return false, as there's no way to check access for an other user!
*
* @ToDo $rel_path is not yet implemented, as no app use it currently
* @param string $app
* @param string|int $id id of entry
* @param int $required =Acl::READ Acl::{READ|EDIT}
* @param string $rel_path =null
* @param int $user =null default null = current user
* @return boolean true if access granted, false otherwise
*/
static function file_access($app,$id,$required=Acl::READ,$rel_path=null,$user=null)
{
// are we called for an other user
if ($user && $user != $GLOBALS['egw_info']['user']['account_id'])
{
// check if app supports file_access WITH 4th $user parameter --> return false if not
if (!self::get_registry($app,'file_access_user') || !($method = self::get_registry($app,'file_access')))
{
$ret = false;
$err = "(no file_access_user)";
}
else
{
$ret = self::exec($method, array($id, $required, $rel_path, $user));
$err = "(from $method)";
}
//error_log(__METHOD__."('$app',$id,$required,'$rel_path',$user) returning $err ".array2string($ret));
return $ret;
}
$cache =& self::get_cache($app,$id,'file_access');
if (!isset($cache) || $required == Acl::EDIT && !($cache & $required))
{
if(($method = self::get_registry($app,'file_access')))
{
$cache |= self::exec($method, array($id, $required, $rel_path)) ? $required|Acl::READ : 0;
}
else
{
$cache |= self::title($app,$id) ? Acl::READ|Acl::EDIT : 0;
}
//error_log(__METHOD__."($app,$id,$required,$rel_path) got $cache --> ".($cache & $required ? 'true' : 'false'));
}
//else error_log(__METHOD__."($app,$id,$required,$rel_path) using cached value $cache --> ".($cache & $required ? 'true' : 'false'));
return !!($cache & $required);
}
/**
* Execute a static method or $app.$class.$method string with given arguments
*
* In case of a non-static method as shared instance of the class is used.
* This is a replacement for global ExecMethod(2) functions.
*
* @param callable|string $method "$app.$class.$method" or static method
* @param array $params array with arguments incl. references
* @return mixed
*/
protected static function exec($method, array $params=array())
{
static $objs = array();
// static methods or callables can be called directly
if (is_callable($method))
{
return call_user_func_array($method, $params);
}
list($app, $class, $m) = $parts = explode('.', $method);
if (count($parts) != 3) throw Api\Exception\WrongParameter("Wrong dot-delimited method string '$method'!");
if (!isset($objs[$class]))
{
if (!class_exists($class))
{
require_once EGW_INCLUDE_ROOT.'/'.$app.'/inc/class.'.$class.'.inc.php';
}
$objs[$class] = new $class;
}
// php5.6+: return $objs[$class]->$m(...$params);
return call_user_func_array(array($objs[$class], $m), $params);
}
}
Link::init_static();
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