ResourceLoaderModule.php

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<?php
abstract class ResourceLoaderModule {

        # Type of resource
        const TYPE_SCRIPTS = 'scripts';
        const TYPE_STYLES = 'styles';
        const TYPE_MESSAGES = 'messages';
        const TYPE_COMBINED = 'combined';

        # sitewide core module like a skin file or jQuery component
        const ORIGIN_CORE_SITEWIDE = 1;

        # per-user module generated by the software
        const ORIGIN_CORE_INDIVIDUAL = 2;

        # sitewide module generated from user-editable files, like MediaWiki:Common.js, or
        # modules accessible to multiple users, such as those generated by the Gadgets extension.
        const ORIGIN_USER_SITEWIDE = 3;

        # per-user module generated from user-editable files, like User:Me/vector.js
        const ORIGIN_USER_INDIVIDUAL = 4;

        # an access constant; make sure this is kept as the largest number in this group
        const ORIGIN_ALL = 10;

        # script and style modules form a hierarchy of trustworthiness, with core modules like
        # skins and jQuery as most trustworthy, and user scripts as least trustworthy.  We can
        # limit the types of scripts and styles we allow to load on, say, sensitive special
        # pages like Special:UserLogin and Special:Preferences
        protected $origin = self::ORIGIN_CORE_SITEWIDE;

        /* Protected Members */

        protected $name = null;

        // In-object cache for file dependencies
        protected $fileDeps = array();
        // In-object cache for message blob mtime
        protected $msgBlobMtime = array();

        /* Methods */

        public function getName() {
                return $this->name;
        }

        public function setName( $name ) {
                $this->name = $name;
        }

        public function getOrigin() {
                return $this->origin;
        }

        public function setOrigin( $origin ) {
                $this->origin = $origin;
        }

        public function getFlip( $context ) {
                global $wgContLang;

                return $wgContLang->getDir() !== $context->getDirection();
        }

        public function getScript( ResourceLoaderContext $context ) {
                // Stub, override expected
                return '';
        }

        public function getScriptURLsForDebug( ResourceLoaderContext $context ) {
                $url = ResourceLoader::makeLoaderURL(
                        array( $this->getName() ),
                        $context->getLanguage(),
                        $context->getSkin(),
                        $context->getUser(),
                        $context->getVersion(),
                        true, // debug
                        'scripts', // only
                        $context->getRequest()->getBool( 'printable' ),
                        $context->getRequest()->getBool( 'handheld' )
                );
                return array( $url );
        }

        public function supportsURLLoading() {
                return true;
        }

        public function getStyles( ResourceLoaderContext $context ) {
                // Stub, override expected
                return array();
        }

        public function getStyleURLsForDebug( ResourceLoaderContext $context ) {
                $url = ResourceLoader::makeLoaderURL(
                        array( $this->getName() ),
                        $context->getLanguage(),
                        $context->getSkin(),
                        $context->getUser(),
                        $context->getVersion(),
                        true, // debug
                        'styles', // only
                        $context->getRequest()->getBool( 'printable' ),
                        $context->getRequest()->getBool( 'handheld' )
                );
                return array( 'all' => array( $url ) );
        }

        public function getMessages() {
                // Stub, override expected
                return array();
        }

        public function getGroup() {
                // Stub, override expected
                return null;
        }

        public function getSource() {
                // Stub, override expected
                return 'local';
        }

        public function getPosition() {
                return 'bottom';
        }

        public function getLoaderScript() {
                // Stub, override expected
                return false;
        }

        public function getDependencies() {
                // Stub, override expected
                return array();
        }

        public function getFileDependencies( $skin ) {
                // Try in-object cache first
                if ( isset( $this->fileDeps[$skin] ) ) {
                        return $this->fileDeps[$skin];
                }

                $dbr = wfGetDB( DB_SLAVE );
                $deps = $dbr->selectField( 'module_deps', 'md_deps', array(
                                'md_module' => $this->getName(),
                                'md_skin' => $skin,
                        ), __METHOD__
                );
                if ( !is_null( $deps ) ) {
                        $this->fileDeps[$skin] = (array) FormatJson::decode( $deps, true );
                } else {
                        $this->fileDeps[$skin] = array();
                }
                return $this->fileDeps[$skin];
        }

        public function setFileDependencies( $skin, $deps ) {
                $this->fileDeps[$skin] = $deps;
        }

        public function getMsgBlobMtime( $lang ) {
                if ( !isset( $this->msgBlobMtime[$lang] ) ) {
                        if ( !count( $this->getMessages() ) )
                                return 0;

                        $dbr = wfGetDB( DB_SLAVE );
                        $msgBlobMtime = $dbr->selectField( 'msg_resource', 'mr_timestamp', array(
                                        'mr_resource' => $this->getName(),
                                        'mr_lang' => $lang
                                ), __METHOD__
                        );
                        // If no blob was found, but the module does have messages, that means we need
                        // to regenerate it. Return NOW
                        if ( $msgBlobMtime === false ) {
                                $msgBlobMtime = wfTimestampNow();
                        }
                        $this->msgBlobMtime[$lang] = wfTimestamp( TS_UNIX, $msgBlobMtime );
                }
                return $this->msgBlobMtime[$lang];
        }

        public function setMsgBlobMtime( $lang, $mtime ) {
                $this->msgBlobMtime[$lang] = $mtime;
        }

        /* Abstract Methods */

        public function getModifiedTime( ResourceLoaderContext $context ) {
                // 0 would mean now
                return 1;
        }

        public function isKnownEmpty( ResourceLoaderContext $context ) {
                return false;
        }


        private static $jsParser;
        private static $parseCacheVersion = 1;

        protected function validateScriptFile( $fileName, $contents ) {
                global $wgResourceLoaderValidateJS;
                if ( $wgResourceLoaderValidateJS ) {
                        // Try for cache hit
                        // Use CACHE_ANYTHING since filtering is very slow compared to DB queries
                        $key = wfMemcKey( 'resourceloader', 'jsparse', self::$parseCacheVersion, md5( $contents ) );
                        $cache = wfGetCache( CACHE_ANYTHING );
                        $cacheEntry = $cache->get( $key );
                        if ( is_string( $cacheEntry ) ) {
                                return $cacheEntry;
                        }

                        $parser = self::javaScriptParser();
                        try {
                                $parser->parse( $contents, $fileName, 1 );
                                $result = $contents;
                        } catch (Exception $e) {
                                // We'll save this to cache to avoid having to validate broken JS over and over...
                                $err = $e->getMessage();
                                $result = "throw new Error(" . Xml::encodeJsVar("JavaScript parse error: $err") . ");";
                        }

                        $cache->set( $key, $result );
                        return $result;
                } else {
                        return $contents;
                }
        }

        protected static function javaScriptParser() {
                if ( !self::$jsParser ) {
                        self::$jsParser = new JSParser();
                }
                return self::$jsParser;
        }

}