Current File : //proc/985914/root/www/varak.net/wiki.varak.net/includes/registration/ExtensionRegistry.php
<?php
use Composer\Semver\Semver;
/**
* 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
* Note: Update MANIFEST_VERSION_MW_VERSION when changing this
*/
const MANIFEST_VERSION = 2;
/**
* MediaWiki version constraint representing what the current
* highest MANIFEST_VERSION is supported in
*/
const MANIFEST_VERSION_MW_VERSION = '>= 1.29.0';
/**
* Version of the oldest supported manifest version
*/
const OLDEST_MANIFEST_VERSION = 1;
/**
* Bump whenever the registration cache needs resetting
*/
const CACHE_VERSION = 7;
/**
* Special key that defines the merge strategy
*
* @since 1.26
*/
const MERGE_STRATEGY = '_merge_strategy';
/**
* 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 = [];
/**
* Whether we are done loading things
*
* @var bool
*/
private $finished = false;
/**
* Items in the JSON file that aren't being
* set as globals
*
* @var array
*/
protected $attributes = [];
/**
* @var ExtensionRegistry
*/
private static $instance;
/**
* @codeCoverageIgnore
* @return ExtensionRegistry
*/
public static function getInstance() {
if ( self::$instance === null ) {
self::$instance = new self();
}
return self::$instance;
}
/**
* @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!" );
}
// @codeCoverageIgnoreStart
if ( $mtime === false ) {
$err = error_get_last();
throw new Exception( "Couldn't stat $path: {$err['message']}" );
// @codeCoverageIgnoreEnd
}
}
$this->queued[$path] = $mtime;
}
/**
* @throws MWException If the queue is already marked as finished (no further things should
* be loaded then).
*/
public function loadFromQueue() {
global $wgVersion, $wgDevelopmentWarnings;
if ( !$this->queued ) {
return;
}
if ( $this->finished ) {
throw new MWException(
"The following paths tried to load late: "
. implode( ', ', array_keys( $this->queued ) )
);
}
// A few more things to vary the cache on
$versions = [
'registration' => self::CACHE_VERSION,
'mediawiki' => $wgVersion
];
// We use a try/catch because we don't want to fail here
// if $wgObjectCaches is not configured properly for APC setup
try {
// Don't use MediaWikiServices here to prevent instantiating it before extensions have
// been loaded
$cacheId = ObjectCache::detectLocalServerCache();
$cache = ObjectCache::newFromId( $cacheId );
} catch ( InvalidArgumentException $e ) {
$cache = new EmptyBagOStuff();
}
// See if this queue is in APC
$key = $cache->makeKey(
'registration',
md5( json_encode( $this->queued + $versions ) )
);
$data = $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'] );
if ( !( $data['warnings'] && $wgDevelopmentWarnings ) ) {
// If there were no warnings that were shown, cache it
$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 = [];
}
/**
* After this is called, no more extensions can be loaded
*
* @since 1.29
*/
public function finish() {
$this->finished = true;
}
/**
* 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
* @throws ExtensionDependencyError
*/
public function readFromQueue( array $queue ) {
global $wgVersion;
$autoloadClasses = [];
$autoloadNamespaces = [];
$autoloaderPaths = [];
$processor = new ExtensionProcessor();
$versionChecker = new VersionChecker(
$wgVersion,
PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION . '.' . PHP_RELEASE_VERSION,
get_loaded_extensions()
);
$extDependencies = [];
$incompatible = [];
$warnings = false;
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( $info['manifest_version'] ) ) {
wfDeprecated(
"{$info['name']}'s extension.json or skin.json does not have manifest_version",
'1.29'
);
$warnings = true;
// 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 ) {
$incompatible[] = "$path: unsupported manifest_version: {$version}";
}
$dir = dirname( $path );
if ( isset( $info['AutoloadClasses'] ) ) {
$autoload = $this->processAutoLoader( $dir, $info['AutoloadClasses'] );
$GLOBALS['wgAutoloadClasses'] += $autoload;
$autoloadClasses += $autoload;
}
if ( isset( $info['AutoloadNamespaces'] ) ) {
$autoloadNamespaces += $this->processAutoLoader( $dir, $info['AutoloadNamespaces'] );
AutoLoader::$psr4Namespaces += $autoloadNamespaces;
}
// get all requirements/dependencies for this extension
$requires = $processor->getRequirements( $info );
// validate the information needed and add the requirements
if ( is_array( $requires ) && $requires && isset( $info['name'] ) ) {
$extDependencies[$info['name']] = $requires;
}
// Get extra paths for later inclusion
$autoloaderPaths = array_merge( $autoloaderPaths,
$processor->getExtraAutoloaderPaths( $dir, $info ) );
// Compatible, read and extract info
$processor->extractInfo( $path, $info, $version );
}
$data = $processor->getExtractedInfo();
$data['warnings'] = $warnings;
// check for incompatible extensions
$incompatible = array_merge(
$incompatible,
$versionChecker
->setLoadedExtensionsAndSkins( $data['credits'] )
->checkArray( $extDependencies )
);
if ( $incompatible ) {
throw new ExtensionDependencyError( $incompatible );
}
// Need to set this so we can += to it later
$data['globals']['wgAutoloadClasses'] = [];
$data['autoload'] = $autoloadClasses;
$data['autoloaderPaths'] = $autoloaderPaths;
$data['autoloaderNS'] = $autoloadNamespaces;
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 ( !array_key_exists( $key, $GLOBALS ) || ( 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_replace_recursive':
$GLOBALS[$key] = array_replace_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'" );
}
}
if ( isset( $info['autoloaderNS'] ) ) {
AutoLoader::$psr4Namespaces += $info['autoloaderNS'];
}
foreach ( $info['defines'] as $name => $val ) {
define( $name, $val );
}
foreach ( $info['autoloaderPaths'] as $path ) {
if ( file_exists( $path ) ) {
require_once $path;
}
}
$this->loaded += $info['credits'];
if ( $info['attributes'] ) {
if ( !$this->attributes ) {
$this->attributes = $info['attributes'];
} else {
$this->attributes = array_merge_recursive( $this->attributes, $info['attributes'] );
}
}
foreach ( $info['callbacks'] as $name => $cb ) {
if ( !is_callable( $cb ) ) {
if ( is_array( $cb ) ) {
$cb = '[ ' . implode( ', ', $cb ) . ' ]';
}
throw new UnexpectedValueException( "callback '$cb' is not callable" );
}
call_user_func( $cb, $info['credits'][$name] );
}
}
/**
* 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
* @param string $constraint The required version constraint for this dependency
* @throws LogicException if a specific contraint is asked for,
* but the extension isn't versioned
* @return bool
*/
public function isLoaded( $name, $constraint = '*' ) {
$isLoaded = isset( $this->loaded[$name] );
if ( $constraint === '*' || !$isLoaded ) {
return $isLoaded;
}
// if a specific constraint is requested, but no version is set, throw an exception
if ( !isset( $this->loaded[$name]['version'] ) ) {
$msg = "{$name} does not expose its version, but an extension or a skin"
. " requires: {$constraint}.";
throw new LogicException( $msg );
}
return SemVer::satisfies( $this->loaded[$name]['version'], $constraint );
}
/**
* @param string $name
* @return array
*/
public function getAttribute( $name ) {
return $this->attributes[$name] ?? [];
}
/**
* Get information about all things
*
* @return array
*/
public function getAllThings() {
return $this->loaded;
}
/**
* Fully expand autoloader paths
*
* @param string $dir
* @param array $files
* @return array
*/
protected function processAutoLoader( $dir, array $files ) {
// Make paths absolute, relative to the JSON file
foreach ( $files as &$file ) {
$file = "$dir/$file";
}
return $files;
}
}
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