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<?php
/**
* File backend registration handling.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup FileBackend
* @author Aaron Schulz
*/
/**
* Class to handle file backend registration
*
* @ingroup FileBackend
* @since 1.19
*/
class FileBackendGroup {
/**
* @var FileBackendGroup
*/
protected static $instance = null;
/** @var Array (name => ('class' => string, 'config' => array, 'instance' => object)) */
protected $backends = array();
protected function __construct() {}
/**
* @return FileBackendGroup
*/
public static function singleton() {
if ( self::$instance == null ) {
self::$instance = new self();
self::$instance->initFromGlobals();
}
return self::$instance;
}
/**
* Destroy the singleton instance
*
* @return void
*/
public static function destroySingleton() {
self::$instance = null;
}
/**
* Register file backends from the global variables
*
* @return void
*/
protected function initFromGlobals() {
global $wgLocalFileRepo, $wgForeignFileRepos, $wgFileBackends;
// Register explicitly defined backends
$this->register( $wgFileBackends );
$autoBackends = array();
// Automatically create b/c backends for file repos...
$repos = array_merge( $wgForeignFileRepos, array( $wgLocalFileRepo ) );
foreach ( $repos as $info ) {
$backendName = $info['backend'];
if ( is_object( $backendName ) || isset( $this->backends[$backendName] ) ) {
continue; // already defined (or set to the object for some reason)
}
$repoName = $info['name'];
// Local vars that used to be FSRepo members...
$directory = $info['directory'];
$deletedDir = isset( $info['deletedDir'] )
? $info['deletedDir']
: false; // deletion disabled
$thumbDir = isset( $info['thumbDir'] )
? $info['thumbDir']
: "{$directory}/thumb";
$fileMode = isset( $info['fileMode'] )
? $info['fileMode']
: 0644;
// Get the FS backend configuration
$autoBackends[] = array(
'name' => $backendName,
'class' => 'FSFileBackend',
'lockManager' => 'fsLockManager',
'containerPaths' => array(
"{$repoName}-public" => "{$directory}",
"{$repoName}-thumb" => $thumbDir,
"{$repoName}-deleted" => $deletedDir,
"{$repoName}-temp" => "{$directory}/temp"
),
'fileMode' => $fileMode,
);
}
// Register implicitly defined backends
$this->register( $autoBackends );
}
/**
* Register an array of file backend configurations
*
* @param $configs Array
* @return void
* @throws MWException
*/
protected function register( array $configs ) {
foreach ( $configs as $config ) {
if ( !isset( $config['name'] ) ) {
throw new MWException( "Cannot register a backend with no name." );
}
$name = $config['name'];
if ( !isset( $config['class'] ) ) {
throw new MWException( "Cannot register backend `{$name}` with no class." );
}
$class = $config['class'];
unset( $config['class'] ); // backend won't need this
$this->backends[$name] = array(
'class' => $class,
'config' => $config,
'instance' => null
);
}
}
/**
* Get the backend object with a given name
*
* @param $name string
* @return FileBackend
* @throws MWException
*/
public function get( $name ) {
if ( !isset( $this->backends[$name] ) ) {
throw new MWException( "No backend defined with the name `$name`." );
}
// Lazy-load the actual backend instance
if ( !isset( $this->backends[$name]['instance'] ) ) {
$class = $this->backends[$name]['class'];
$config = $this->backends[$name]['config'];
$this->backends[$name]['instance'] = new $class( $config );
}
return $this->backends[$name]['instance'];
}
/**
* Get the config array for a backend object with a given name
*
* @param $name string
* @return Array
* @throws MWException
*/
public function config( $name ) {
if ( !isset( $this->backends[$name] ) ) {
throw new MWException( "No backend defined with the name `$name`." );
}
$class = $this->backends[$name]['class'];
return array( 'class' => $class ) + $this->backends[$name]['config'];
}
/**
* Get an appropriate backend object from a storage path
*
* @param $storagePath string
* @return FileBackend|null Backend or null on failure
*/
public function backendFromPath( $storagePath ) {
list( $backend, $c, $p ) = FileBackend::splitStoragePath( $storagePath );
if ( $backend !== null && isset( $this->backends[$backend] ) ) {
return $this->get( $backend );
}
return null;
}
}
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