--- /dev/null
+<?php
+
+use MediaWiki\MediaWikiServices;
+
+/**
+ * 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 = 2;
+
+ /**
+ * Version of the oldest supported manifest version
+ */
+ const OLDEST_MANIFEST_VERSION = 1;
+
+ /**
+ * Bump whenever the registration cache needs resetting
+ */
+ const CACHE_VERSION = 6;
+
+ /**
+ * 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 $instance;
+
+ /**
+ * @return ExtensionRegistry
+ */
+ public static function getInstance() {
+ if ( self::$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!" );
+ }
+
+ if ( $mtime === false ) {
+ $err = error_get_last();
+ throw new Exception( "Couldn't stat $path: {$err['message']}" );
+ }
+ }
+ $this->queued[$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 {
+ $cache = MediaWikiServices::getInstance()->getLocalServerObjectCache();
+ } catch ( MWException $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
+ */
+ public function readFromQueue( array $queue ) {
+ global $wgVersion;
+ $autoloadClasses = [];
+ $autoloaderPaths = [];
+ $processor = new ExtensionProcessor();
+ $versionChecker = new VersionChecker( $wgVersion );
+ $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}";
+ }
+
+ $autoload = $this->processAutoLoader( dirname( $path ), $info );
+ // Set up the autoloader now so custom processors will work
+ $GLOBALS['wgAutoloadClasses'] += $autoload;
+ $autoloadClasses += $autoload;
+
+ // 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( dirname( $path ), $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 ) {
+ if ( count( $incompatible ) === 1 ) {
+ throw new Exception( $incompatible[0] );
+ } else {
+ throw new Exception( implode( "\n", $incompatible ) );
+ }
+ }
+
+ // 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_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'" );
+ }
+ }
+
+ foreach ( $info['defines'] as $name => $val ) {
+ define( $name, $val );
+ }
+ foreach ( $info['autoloaderPaths'] as $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
+ * @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 [];
+ }
+ }
+}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff