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<?php
/**
* ExtensionRegistry class
*
* The Registry loads JSON files, and uses a Processor
* to extract information from them. It also registers
* classes with the autoloader.
*
* @since 1.25
*/
class ExtensionRegistry {
/**
* "requires" key that applies to MediaWiki core/$wgVersion
*/
const MEDIAWIKI_CORE = 'MediaWiki';
/**
* Version of the highest supported manifest version
*/
const MANIFEST_VERSION = 1;
/**
* Version of the oldest supported manifest version
*/
const OLDEST_MANIFEST_VERSION = 1;
/**
* Bump whenever the registration cache needs resetting
*/
const CACHE_VERSION = 3;
/**
* Special key that defines the merge strategy
*
* @since 1.26
*/
const MERGE_STRATEGY = '_merge_strategy';
/**
* @var BagOStuff
*/
protected $cache;
/**
* Array of loaded things, keyed by name, values are credits information
*
* @var array
*/
private $loaded = [];
/**
* List of paths that should be loaded
*
* @var array
*/
protected $queued = [];
/**
* Items in the JSON file that aren't being
* set as globals
*
* @var array
*/
protected $attributes = [];
/**
* @var ExtensionRegistry
*/
private static $instance;
/**
* @return ExtensionRegistry
*/
public static function getInstance() {
if ( self::$instance === null ) {
self::$instance = new self();
}
return self::$instance;
}
public function __construct() {
// We use a try/catch instead of the $fallback parameter because
// we don't want to fail here if $wgObjectCaches is not configured
// properly for APC setup
try {
$this->cache = ObjectCache::getLocalServerInstance();
} catch ( MWException $e ) {
$this->cache = new EmptyBagOStuff();
}
}
/**
* @param string $path Absolute path to the JSON file
*/
public function queue( $path ) {
global $wgExtensionInfoMTime;
$mtime = $wgExtensionInfoMTime;
if ( $mtime === false ) {
if ( file_exists( $path ) ) {
$mtime = filemtime( $path );
} else {
throw new Exception( "$path does not exist!" );
}
if ( !$mtime ) {
$err = error_get_last();
throw new Exception( "Couldn't stat $path: {$err['message']}" );
}
}
$this->queued[$path] = $mtime;
}
public function loadFromQueue() {
global $wgVersion;
if ( !$this->queued ) {
return;
}
// A few more things to vary the cache on
$versions = [
'registration' => self::CACHE_VERSION,
'mediawiki' => $wgVersion
];
// See if this queue is in APC
$key = wfMemcKey(
'registration',
md5( json_encode( $this->queued + $versions ) )
);
$data = $this->cache->get( $key );
if ( $data ) {
$this->exportExtractedData( $data );
} else {
$data = $this->readFromQueue( $this->queued );
$this->exportExtractedData( $data );
// Do this late since we don't want to extract it since we already
// did that, but it should be cached
$data['globals']['wgAutoloadClasses'] += $data['autoload'];
unset( $data['autoload'] );
$this->cache->set( $key, $data, 60 * 60 * 24 );
}
$this->queued = [];
}
/**
* Get the current load queue. Not intended to be used
* outside of the installer.
*
* @return array
*/
public function getQueue() {
return $this->queued;
}
/**
* Clear the current load queue. Not intended to be used
* outside of the installer.
*/
public function clearQueue() {
$this->queued = [];
}
/**
* Process a queue of extensions and return their extracted data
*
* @param array $queue keys are filenames, values are ignored
* @return array extracted info
* @throws Exception
*/
public function readFromQueue( array $queue ) {
global $wgVersion;
$autoloadClasses = [];
$autoloaderPaths = [];
$processor = new ExtensionProcessor();
$incompatible = [];
$coreVersionParser = new CoreVersionChecker( $wgVersion );
foreach ( $queue as $path => $mtime ) {
$json = file_get_contents( $path );
if ( $json === false ) {
throw new Exception( "Unable to read $path, does it exist?" );
}
$info = json_decode( $json, /* $assoc = */ true );
if ( !is_array( $info ) ) {
throw new Exception( "$path is not a valid JSON file." );
}
if ( !isset( $info['manifest_version'] ) ) {
// For backwards-compatability, assume a version of 1
$info['manifest_version'] = 1;
}
$version = $info['manifest_version'];
if ( $version < self::OLDEST_MANIFEST_VERSION || $version > self::MANIFEST_VERSION ) {
throw new Exception( "$path: unsupported manifest_version: {$version}" );
}
$autoload = $this->processAutoLoader( dirname( $path ), $info );
// Set up the autoloader now so custom processors will work
$GLOBALS['wgAutoloadClasses'] += $autoload;
$autoloadClasses += $autoload;
// Check any constraints against MediaWiki core
$requires = $processor->getRequirements( $info );
if ( isset( $requires[self::MEDIAWIKI_CORE] )
&& !$coreVersionParser->check( $requires[self::MEDIAWIKI_CORE] )
) {
// Doesn't match, mark it as incompatible.
$incompatible[] = "{$info['name']} is not compatible with the current "
. "MediaWiki core (version {$wgVersion}), it requires: " . $requires[self::MEDIAWIKI_CORE]
. '.';
continue;
}
// Get extra paths for later inclusion
$autoloaderPaths = array_merge( $autoloaderPaths,
$processor->getExtraAutoloaderPaths( dirname( $path ), $info ) );
// Compatible, read and extract info
$processor->extractInfo( $path, $info, $version );
}
if ( $incompatible ) {
if ( count( $incompatible ) === 1 ) {
throw new Exception( $incompatible[0] );
} else {
throw new Exception( implode( "\n", $incompatible ) );
}
}
$data = $processor->getExtractedInfo();
// Need to set this so we can += to it later
$data['globals']['wgAutoloadClasses'] = [];
$data['autoload'] = $autoloadClasses;
$data['autoloaderPaths'] = $autoloaderPaths;
return $data;
}
protected function exportExtractedData( array $info ) {
foreach ( $info['globals'] as $key => $val ) {
// If a merge strategy is set, read it and remove it from the value
// so it doesn't accidentally end up getting set.
if ( is_array( $val ) && isset( $val[self::MERGE_STRATEGY] ) ) {
$mergeStrategy = $val[self::MERGE_STRATEGY];
unset( $val[self::MERGE_STRATEGY] );
} else {
$mergeStrategy = 'array_merge';
}
// Optimistic: If the global is not set, or is an empty array, replace it entirely.
// Will be O(1) performance.
if ( !isset( $GLOBALS[$key] ) || ( is_array( $GLOBALS[$key] ) && !$GLOBALS[$key] ) ) {
$GLOBALS[$key] = $val;
continue;
}
if ( !is_array( $GLOBALS[$key] ) || !is_array( $val ) ) {
// config setting that has already been overridden, don't set it
continue;
}
switch ( $mergeStrategy ) {
case 'array_merge_recursive':
$GLOBALS[$key] = array_merge_recursive( $GLOBALS[$key], $val );
break;
case 'array_plus_2d':
$GLOBALS[$key] = wfArrayPlus2d( $GLOBALS[$key], $val );
break;
case 'array_plus':
$GLOBALS[$key] += $val;
break;
case 'array_merge':
$GLOBALS[$key] = array_merge( $val, $GLOBALS[$key] );
break;
default:
throw new UnexpectedValueException( "Unknown merge strategy '$mergeStrategy'" );
}
}
foreach ( $info['defines'] as $name => $val ) {
define( $name, $val );
}
foreach ( $info['autoloaderPaths'] as $path ) {
require_once $path;
}
foreach ( $info['callbacks'] as $cb ) {
call_user_func( $cb );
}
$this->loaded += $info['credits'];
if ( $info['attributes'] ) {
if ( !$this->attributes ) {
$this->attributes = $info['attributes'];
} else {
$this->attributes = array_merge_recursive( $this->attributes, $info['attributes'] );
}
}
}
/**
* Loads and processes the given JSON file without delay
*
* If some extensions are already queued, this will load
* those as well.
*
* @param string $path Absolute path to the JSON file
*/
public function load( $path ) {
$this->loadFromQueue(); // First clear the queue
$this->queue( $path );
$this->loadFromQueue();
}
/**
* Whether a thing has been loaded
* @param string $name
* @return bool
*/
public function isLoaded( $name ) {
return isset( $this->loaded[$name] );
}
/**
* @param string $name
* @return array
*/
public function getAttribute( $name ) {
if ( isset( $this->attributes[$name] ) ) {
return $this->attributes[$name];
} else {
return [];
}
}
/**
* Get information about all things
*
* @return array
*/
public function getAllThings() {
return $this->loaded;
}
/**
* Mark a thing as loaded
*
* @param string $name
* @param array $credits
*/
protected function markLoaded( $name, array $credits ) {
$this->loaded[$name] = $credits;
}
/**
* Register classes with the autoloader
*
* @param string $dir
* @param array $info
* @return array
*/
protected function processAutoLoader( $dir, array $info ) {
if ( isset( $info['AutoloadClasses'] ) ) {
// Make paths absolute, relative to the JSON file
return array_map( function( $file ) use ( $dir ) {
return "$dir/$file";
}, $info['AutoloadClasses'] );
} else {
return [];
}
}
}