ResourceLoaderStartUpModule.php

Go to the documentation of this file.

<?php
use MediaWiki\MediaWikiServices;
 
class ResourceLoaderStartUpModule extends ResourceLoaderModule {
    protected $targets = [ 'desktop', 'mobile' ];
 
    private function getConfigSettings( $context ) {
        $conf = $this->getConfig();
 
        // We can't use Title::newMainPage() if 'mainpage' is in
        // $wgForceUIMsgAsContentMsg because that will try to use the session
        // user's language and we have no session user. This does the
        // equivalent but falling back to our ResourceLoaderContext language
        // instead.
        $mainPage = Title::newFromText( $context->msg( 'mainpage' )->inContentLanguage()->text() );
        if ( !$mainPage ) {
            $mainPage = Title::newFromText( 'Main Page' );
        }
 
        $contLang = MediaWikiServices::getInstance()->getContentLanguage();
        $namespaceIds = $contLang->getNamespaceIds();
        $caseSensitiveNamespaces = [];
        foreach ( MWNamespace::getCanonicalNamespaces() as $index => $name ) {
            $namespaceIds[$contLang->lc( $name )] = $index;
            if ( !MWNamespace::isCapitalized( $index ) ) {
                $caseSensitiveNamespaces[] = $index;
            }
        }
 
        $illegalFileChars = $conf->get( 'IllegalFileChars' );
        $oldCommentSchema = $conf->get( 'CommentTableSchemaMigrationStage' ) === MIGRATION_OLD;
 
        // Build list of variables
        $vars = [
            'wgLoadScript' => wfScript( 'load' ),
            'debug' => $context->getDebug(),
            'skin' => $context->getSkin(),
            'stylepath' => $conf->get( 'StylePath' ),
            'wgUrlProtocols' => wfUrlProtocols(),
            'wgArticlePath' => $conf->get( 'ArticlePath' ),
            'wgScriptPath' => $conf->get( 'ScriptPath' ),
            'wgScript' => wfScript(),
            'wgSearchType' => $conf->get( 'SearchType' ),
            'wgVariantArticlePath' => $conf->get( 'VariantArticlePath' ),
            // Force object to avoid "empty" associative array from
            // becoming [] instead of {} in JS (T36604)
            'wgActionPaths' => (object)$conf->get( 'ActionPaths' ),
            'wgServer' => $conf->get( 'Server' ),
            'wgServerName' => $conf->get( 'ServerName' ),
            'wgUserLanguage' => $context->getLanguage(),
            'wgContentLanguage' => $contLang->getCode(),
            'wgTranslateNumerals' => $conf->get( 'TranslateNumerals' ),
            'wgVersion' => $conf->get( 'Version' ),
            'wgEnableAPI' => true, // Deprecated since MW 1.32
            'wgEnableWriteAPI' => true, // Deprecated since MW 1.32
            'wgMainPageTitle' => $mainPage->getPrefixedText(),
            'wgFormattedNamespaces' => $contLang->getFormattedNamespaces(),
            'wgNamespaceIds' => $namespaceIds,
            'wgContentNamespaces' => MWNamespace::getContentNamespaces(),
            'wgSiteName' => $conf->get( 'Sitename' ),
            'wgDBname' => $conf->get( 'DBname' ),
            'wgExtraSignatureNamespaces' => $conf->get( 'ExtraSignatureNamespaces' ),
            'wgAvailableSkins' => Skin::getSkinNames(),
            'wgExtensionAssetsPath' => $conf->get( 'ExtensionAssetsPath' ),
            // MediaWiki sets cookies to have this prefix by default
            'wgCookiePrefix' => $conf->get( 'CookiePrefix' ),
            'wgCookieDomain' => $conf->get( 'CookieDomain' ),
            'wgCookiePath' => $conf->get( 'CookiePath' ),
            'wgCookieExpiration' => $conf->get( 'CookieExpiration' ),
            'wgResourceLoaderMaxQueryLength' => $conf->get( 'ResourceLoaderMaxQueryLength' ),
            'wgCaseSensitiveNamespaces' => $caseSensitiveNamespaces,
            'wgLegalTitleChars' => Title::convertByteClassToUnicodeClass( Title::legalChars() ),
            'wgIllegalFileChars' => Title::convertByteClassToUnicodeClass( $illegalFileChars ),
            'wgResourceLoaderStorageVersion' => $conf->get( 'ResourceLoaderStorageVersion' ),
            'wgResourceLoaderStorageEnabled' => $conf->get( 'ResourceLoaderStorageEnabled' ),
            'wgForeignUploadTargets' => $conf->get( 'ForeignUploadTargets' ),
            'wgEnableUploads' => $conf->get( 'EnableUploads' ),
            'wgCommentByteLimit' => $oldCommentSchema ? 255 : null,
            'wgCommentCodePointLimit' => $oldCommentSchema ? null : CommentStore::COMMENT_CHARACTER_LIMIT,
        ];
 
        Hooks::run( 'ResourceLoaderGetConfigVars', [ &$vars ] );
 
        return $vars;
    }
 
    protected static function getImplicitDependencies( array $registryData, $moduleName ) {
        static $dependencyCache = [];
 
        // The list of implicit dependencies won't be altered, so we can
        // cache them without having to worry.
        if ( !isset( $dependencyCache[$moduleName] ) ) {
            if ( !isset( $registryData[$moduleName] ) ) {
                // Dependencies may not exist
                $dependencyCache[$moduleName] = [];
            } else {
                $data = $registryData[$moduleName];
                $dependencyCache[$moduleName] = $data['dependencies'];
 
                foreach ( $data['dependencies'] as $dependency ) {
                    // Recursively get the dependencies of the dependencies
                    $dependencyCache[$moduleName] = array_merge(
                        $dependencyCache[$moduleName],
                        self::getImplicitDependencies( $registryData, $dependency )
                    );
                }
            }
        }
 
        return $dependencyCache[$moduleName];
    }
 
    public static function compileUnresolvedDependencies( array &$registryData ) {
        foreach ( $registryData as $name => &$data ) {
            $dependencies = $data['dependencies'];
            foreach ( $data['dependencies'] as $dependency ) {
                $implicitDependencies = self::getImplicitDependencies( $registryData, $dependency );
                $dependencies = array_diff( $dependencies, $implicitDependencies );
            }
            // Rebuild keys
            $data['dependencies'] = array_values( $dependencies );
        }
    }
 
    public function getModuleRegistrations( ResourceLoaderContext $context ) {
        $resourceLoader = $context->getResourceLoader();
        // Future developers: Use WebRequest::getRawVal() instead getVal().
        // The getVal() method performs slow Language+UTF logic. (f303bb9360)
        $target = $context->getRequest()->getRawVal( 'target', 'desktop' );
        $safemode = $context->getRequest()->getRawVal( 'safemode' ) === '1';
        // Bypass target filter if this request is Special:JavaScriptTest.
        // To prevent misuse in production, this is only allowed if testing is enabled server-side.
        $byPassTargetFilter = $this->getConfig()->get( 'EnableJavaScriptTest' ) && $target === 'test';
 
        $out = '';
        $states = [];
        $registryData = [];
        $moduleNames = $resourceLoader->getModuleNames();
 
        // Preload with a batch so that the below calls to getVersionHash() for each module
        // don't require on-demand loading of more information.
        try {
            $resourceLoader->preloadModuleInfo( $moduleNames, $context );
        } catch ( Exception $e ) {
            // Don't fail the request (T152266)
            // Also print the error in the main output
            $resourceLoader->outputErrorAndLog( $e,
                'Preloading module info from startup failed: {exception}',
                [ 'exception' => $e ]
            );
        }
 
        // Get registry data
        foreach ( $moduleNames as $name ) {
            $module = $resourceLoader->getModule( $name );
            $moduleTargets = $module->getTargets();
            if (
                ( !$byPassTargetFilter && !in_array( $target, $moduleTargets ) )
                || ( $safemode && $module->getOrigin() > ResourceLoaderModule::ORIGIN_CORE_INDIVIDUAL )
            ) {
                continue;
            }
 
            if ( $module->isRaw() ) {
                // Don't register "raw" modules (like 'startup') client-side because depending on them
                // is illegal anyway and would only lead to them being loaded a second time,
                // causing any state to be lost.
 
                // ATTENTION: Because of the line below, this is not going to cause infinite recursion.
                // Think carefully before making changes to this code!
                // The below code is going to call ResourceLoaderModule::getVersionHash() for every module.
                // For StartUpModule (this module) the hash is computed based on the manifest content,
                // which is the very thing we are computing right here. As such, this must skip iterating
                // over 'startup' itself.
                continue;
            }
 
            try {
                $versionHash = $module->getVersionHash( $context );
            } catch ( Exception $e ) {
                // Don't fail the request (T152266)
                // Also print the error in the main output
                $resourceLoader->outputErrorAndLog( $e,
                    'Calculating version for "{module}" failed: {exception}',
                    [
                        'module' => $name,
                        'exception' => $e,
                    ]
                );
                $versionHash = '';
                $states[$name] = 'error';
            }
 
            if ( $versionHash !== '' && strlen( $versionHash ) !== 7 ) {
                $context->getLogger()->warning(
                    "Module '{module}' produced an invalid version hash: '{version}'.",
                    [
                        'module' => $name,
                        'version' => $versionHash,
                    ]
                );
                // Module implementation either broken or deviated from ResourceLoader::makeHash
                // Asserted by tests/phpunit/structure/ResourcesTest.
                $versionHash = ResourceLoader::makeHash( $versionHash );
            }
 
            $skipFunction = $module->getSkipFunction();
            if ( $skipFunction !== null && !ResourceLoader::inDebugMode() ) {
                $skipFunction = ResourceLoader::filter( 'minify-js', $skipFunction );
            }
 
            $registryData[$name] = [
                'version' => $versionHash,
                'dependencies' => $module->getDependencies( $context ),
                'group' => $module->getGroup(),
                'source' => $module->getSource(),
                'skip' => $skipFunction,
            ];
        }
 
        self::compileUnresolvedDependencies( $registryData );
 
        // Register sources
        $out .= ResourceLoader::makeLoaderSourcesScript( $resourceLoader->getSources() );
 
        // Figure out the different call signatures for mw.loader.register
        $registrations = [];
        foreach ( $registryData as $name => $data ) {
            // Call mw.loader.register(name, version, dependencies, group, source, skip)
            $registrations[] = [
                $name,
                $data['version'],
                $data['dependencies'],
                $data['group'],
                // Swap default (local) for null
                $data['source'] === 'local' ? null : $data['source'],
                $data['skip']
            ];
        }
 
        // Register modules
        $out .= "\n" . ResourceLoader::makeLoaderRegisterScript( $registrations );
 
        if ( $states ) {
            $out .= "\n" . ResourceLoader::makeLoaderStateScript( $states );
        }
 
        return $out;
    }
 
    public function isRaw() {
        return true;
    }
 
    public static function getStartupModules() {
        wfDeprecated( __METHOD__, '1.32' );
        return [];
    }
 
    public static function getLegacyModules() {
        wfDeprecated( __METHOD__, '1.32' );
        return [];
    }
 
    public function getBaseModulesInternal() {
        return $this->getBaseModules();
    }
 
    private function getBaseModules() {
        global $wgIncludeLegacyJavaScript;
 
        $baseModules = [ 'jquery', 'mediawiki.base' ];
        if ( $wgIncludeLegacyJavaScript ) {
            $baseModules[] = 'mediawiki.legacy.wikibits';
        }
 
        return $baseModules;
    }
 
    public function getScript( ResourceLoaderContext $context ) {
        global $IP;
        if ( $context->getOnly() !== 'scripts' ) {
            return '/* Requires only=script */';
        }
 
        $startupCode = file_get_contents( "$IP/resources/src/startup/startup.js" );
 
        // The files read here MUST be kept in sync with maintenance/jsduck/eg-iframe.html,
        // and MUST be considered by 'fileHashes' in StartUpModule::getDefinitionSummary().
        $mwLoaderCode = file_get_contents( "$IP/resources/src/startup/mediawiki.js" ) .
            file_get_contents( "$IP/resources/src/startup/mediawiki.requestIdleCallback.js" );
        if ( $context->getDebug() ) {
            $mwLoaderCode .= file_get_contents( "$IP/resources/src/startup/mediawiki.log.js" );
        }
        if ( $this->getConfig()->get( 'ResourceLoaderEnableJSProfiler' ) ) {
            $mwLoaderCode .= file_get_contents( "$IP/resources/src/startup/profiler.js" );
        }
 
        // Perform replacements for mediawiki.js
        $mwLoaderPairs = [
            '$VARS.baseModules' => ResourceLoader::encodeJsonForScript( $this->getBaseModules() ),
        ];
        $profilerStubs = [
            '$CODE.profileExecuteStart();' => 'mw.loader.profiler.onExecuteStart( module );',
            '$CODE.profileExecuteEnd();' => 'mw.loader.profiler.onExecuteEnd( module );',
            '$CODE.profileScriptStart();' => 'mw.loader.profiler.onScriptStart( module );',
            '$CODE.profileScriptEnd();' => 'mw.loader.profiler.onScriptEnd( module );',
        ];
        if ( $this->getConfig()->get( 'ResourceLoaderEnableJSProfiler' ) ) {
            // When profiling is enabled, insert the calls.
            $mwLoaderPairs += $profilerStubs;
        } else {
            // When disabled (by default), insert nothing.
            $mwLoaderPairs += array_fill_keys( array_keys( $profilerStubs ), '' );
        }
        $mwLoaderCode = strtr( $mwLoaderCode, $mwLoaderPairs );
 
        // Perform string replacements for startup.js
        $pairs = [
            '$VARS.wgLegacyJavaScriptGlobals' => ResourceLoader::encodeJsonForScript(
                $this->getConfig()->get( 'LegacyJavaScriptGlobals' )
            ),
            '$VARS.configuration' => ResourceLoader::encodeJsonForScript(
                $this->getConfigSettings( $context )
            ),
            // Raw JavaScript code (not JSON)
            '$CODE.registrations();' => trim( $this->getModuleRegistrations( $context ) ),
            '$CODE.defineLoader();' => $mwLoaderCode,
        ];
        $startupCode = strtr( $startupCode, $pairs );
 
        return $startupCode;
    }
 
    public function supportsURLLoading() {
        return false;
    }
 
    public function enableModuleContentVersion() {
        // Enabling this means that ResourceLoader::getVersionHash will simply call getScript()
        // and hash it to determine the version (as used by E-Tag HTTP response header).
        return true;
    }
 
    public function getGroup() {
        return 'startup';
    }
}