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<?php /** * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ namespace MediaWiki\ResourceLoader; use MediaWiki\Html\Html; use Wikimedia\WrappedString; use Wikimedia\WrappedStringList; /** * Load and configure a ResourceLoader client on an HTML page. * * @ingroup ResourceLoader * @since 1.28 */ class ClientHtml { /** @var Context */ private $context; /** @var ResourceLoader */ private $resourceLoader; /** @var array<string,string|null|false> */ private $options; /** @var array<string,mixed> */ private $config = []; /** @var string[] */ private $modules = []; /** @var string[] */ private $moduleStyles = []; /** @var array<string,string> */ private $exemptStates = []; /** @var array */ private $data; /** * @param Context $context * @param array $options [optional] Array of options * - 'target': Parameter for modules=startup request, see StartUpModule. * - 'safemode': Parameter for modules=startup request, see StartUpModule. * - 'clientPrefEnabled': See Skin options. * - 'clientPrefCookiePrefix': See $wgCookiePrefix. */ public function __construct( Context $context, array $options = [] ) { $this->context = $context; $this->resourceLoader = $context->getResourceLoader(); $this->options = $options + [ 'target' => null, 'safemode' => null, 'clientPrefEnabled' => false, 'clientPrefCookiePrefix' => '', ]; } /** * Set mw.config variables. * * @param array $vars Array of key/value pairs */ public function setConfig( array $vars ): void { foreach ( $vars as $key => $value ) { $this->config[$key] = $value; } } /** * Ensure one or more modules are loaded. * * @param string[] $modules Array of module names */ public function setModules( array $modules ): void { $this->modules = $modules; } /** * Ensure the styles of one or more modules are loaded. * * @param string[] $modules Array of module names */ public function setModuleStyles( array $modules ): void { $this->moduleStyles = $modules; } /** * Set state of special modules that are handled by the caller manually. * * See OutputPage::buildExemptModules() for use cases. * * @param array<string,string> $states Module state keyed by module name */ public function setExemptStates( array $states ): void { $this->exemptStates = $states; } private function getData(): array { if ( $this->data ) { return $this->data; } $rl = $this->resourceLoader; $data = [ 'states' => [ // moduleName => state ], 'general' => [], 'styles' => [], // Embedding for private modules 'embed' => [ 'styles' => [], 'general' => [], ], // Deprecation warnings for style-only modules 'styleDeprecations' => [], ]; foreach ( $this->modules as $name ) { $module = $rl->getModule( $name ); if ( !$module ) { continue; } $group = $module->getGroup(); $context = $this->getContext( $group, Module::TYPE_COMBINED ); $shouldEmbed = $module->shouldEmbedModule( $this->context ); if ( ( $group === Module::GROUP_USER || $shouldEmbed ) && $module->isKnownEmpty( $context ) ) { // This is a user-specific or embedded module, which means its output // can be specific to the current page or user. As such, we can optimise // the way we load it based on the current version of the module. // Avoid needless embed for empty module, preset ready state. $data['states'][$name] = 'ready'; } elseif ( $group === Module::GROUP_USER || $shouldEmbed ) { // - For group=user: We need to provide a pre-generated load.php // url to the client that has the 'user' and 'version' parameters // filled in. Without this, the client would wrongly use the static // version hash, per T64602. // - For shouldEmbed=true: Embed via mw.loader.impl, per T36907. $data['embed']['general'][] = $name; // Avoid duplicate request from mw.loader $data['states'][$name] = 'loading'; } else { // Load via mw.loader.load() $data['general'][] = $name; } } foreach ( $this->moduleStyles as $name ) { $module = $rl->getModule( $name ); if ( !$module ) { continue; } if ( $module->getType() !== Module::LOAD_STYLES ) { $logger = $rl->getLogger(); $logger->error( 'Unexpected general module "{module}" in styles queue.', [ 'module' => $name, ] ); continue; } // Stylesheet doesn't trigger mw.loader callback. // Set "ready" state to allow script modules to depend on this module (T87871). // And to avoid duplicate requests at run-time from mw.loader. // // Optimization: Exclude state for "noscript" modules. Since these are also excluded // from the startup registry, no need to send their states (T291735). $group = $module->getGroup(); if ( $group !== Module::GROUP_NOSCRIPT ) { $data['states'][$name] = 'ready'; } $context = $this->getContext( $group, Module::TYPE_STYLES ); if ( $module->shouldEmbedModule( $this->context ) ) { // Avoid needless embed for private embeds we know are empty. // (Set "ready" state directly instead, which we do a few lines above.) if ( !$module->isKnownEmpty( $context ) ) { // Embed via <style> element $data['embed']['styles'][] = $name; } // For other style modules, always request them, regardless of whether they are // currently known to be empty. Because: // 1. Those modules are requested in batch, so there is no extra request overhead // or extra HTML element to be avoided. // 2. Checking isKnownEmpty for those can be expensive and slow down page view // generation (T230260). // 3. We don't want cached HTML to vary on the current state of a module. // If the module becomes non-empty a few minutes later, it should start working // on cached HTML without requiring a purge. // // But, user-specific modules: // * ... are used on page views not publicly cached. // * ... are in their own group and thus a require a request we can avoid // * ... have known-empty status preloaded by ResourceLoader. } elseif ( $group !== Module::GROUP_USER || !$module->isKnownEmpty( $context ) ) { // Load from load.php?only=styles via <link rel=stylesheet> $data['styles'][] = $name; } $deprecation = $module->getDeprecationWarning(); if ( $deprecation ) { $data['styleDeprecations'][] = $deprecation; } } $this->data = $data; return $this->data; } /** * @return array<string,string> Attributes pairs for the HTML document element */ public function getDocumentAttributes() { return [ 'class' => 'client-nojs' ]; } /** * Set relevant classes on document.documentElement * * @param string|null $nojsClass Class name that Skin will set on HTML document * @return string */ private function getDocumentClassNameScript( $nojsClass ) { // Change "client-nojs" to "client-js". // This enables server rendering of UI components, even for those that should be hidden // in Grade C where JavaScript is unsupported, whilst avoiding a flash of wrong content. // // See also Skin:getHtmlElementAttributes() and startup/startup.js. // // Optimisation: Produce shorter and faster JS by only writing to DOM. // This is possible because Skin informs RL about the final value of <html class>, and // because RL already controls the first element in HTML <head> for performance reasons. // - Avoid reading HTMLElement.className // - Avoid executing JS regexes in the common case, by doing the string replace in PHP. $nojsClass ??= $this->getDocumentAttributes()['class']; $jsClass = preg_replace( '/(^|\s)client-nojs(\s|$)/', '$1client-js$2', $nojsClass ); $jsClassJson = $this->context->encodeJson( $jsClass ); // Apply client preferences stored by mw.user.clientPrefs as "class1,class2", where each // item is an <html> class following the pattern "<key>-clientpref-<value>" (T339268) if ( $this->options['clientPrefEnabled'] ) { $cookiePrefix = $this->options['clientPrefCookiePrefix']; $script = strtr( file_get_contents( MW_INSTALL_PATH . '/resources/src/startup/clientprefs.js' ), [ '$VARS.jsClass' => $jsClassJson, '__COOKIE_PREFIX__' => $cookiePrefix, ] ); } else { $script = "document.documentElement.className = {$jsClassJson};"; } return $script; } /** * The order of elements in the head is as follows: * - Inline scripts. * - Stylesheets. * - Async external script-src. * * Reasons: * - Script execution may be blocked on preceding stylesheets. * - Async scripts are not blocked on stylesheets. * - Inline scripts can't be asynchronous. * - For styles, earlier is better. * * @param string|null $nojsClass Class name that caller uses on HTML document element * @return string|WrappedStringList HTML */ public function getHeadHtml( $nojsClass = null ) { $script = $this->getDocumentClassNameScript( $nojsClass ); // Inline script: Declare mw.config variables for this page. if ( $this->config ) { $confJson = $this->context->encodeJson( $this->config ); $script .= " RLCONF = {$confJson}; "; } $data = $this->getData(); // Inline script: Declare initial module states for this page. $states = array_merge( $this->exemptStates, $data['states'] ); if ( $states ) { $stateJson = $this->context->encodeJson( $states ); $script .= " RLSTATE = {$stateJson}; "; } // Inline script: Declare general modules to load on this page. if ( $data['general'] ) { $pageModulesJson = $this->context->encodeJson( $data['general'] ); $script .= " RLPAGEMODULES = {$pageModulesJson}; "; } if ( !$this->context->getDebug() ) { $script = ResourceLoader::filter( 'minify-js', $script, [ 'cache' => false ] ); } $chunks = []; $chunks[] = Html::inlineScript( $script ); // Inline RLQ: Embedded modules if ( $data['embed']['general'] ) { $chunks[] = $this->getLoad( $data['embed']['general'], Module::TYPE_COMBINED ); } // External stylesheets (only=styles) if ( $data['styles'] ) { $chunks[] = $this->getLoad( $data['styles'], Module::TYPE_STYLES ); } // Inline stylesheets (embedded only=styles) if ( $data['embed']['styles'] ) { $chunks[] = $this->getLoad( $data['embed']['styles'], Module::TYPE_STYLES ); } // Async scripts. Once the startup is loaded, inline RLQ scripts will run. // Pass-through a custom 'target' from OutputPage (T143066). $startupQuery = [ 'raw' => '1' ]; foreach ( [ 'target', 'safemode' ] as $param ) { if ( $this->options[$param] !== null ) { $startupQuery[$param] = (string)$this->options[$param]; } } $chunks[] = $this->getLoad( 'startup', Module::TYPE_SCRIPTS, $startupQuery ); return WrappedString::join( "\n", $chunks ); } /** * @return string|WrappedStringList HTML */ public function getBodyHtml() { $data = $this->getData(); $chunks = []; // Deprecations for only=styles modules if ( $data['styleDeprecations'] ) { $calls = ''; foreach ( $data['styleDeprecations'] as $warning ) { $calls .= Html::encodeJsCall( 'mw.log.warn', [ $warning ] ); } $chunks[] = ResourceLoader::makeInlineScript( $calls ); } return WrappedString::join( "\n", $chunks ); } private function getContext( $group, $type ): Context { return self::makeContext( $this->context, $group, $type ); } private function getLoad( $modules, $only, array $extraQuery = [] ) { return self::makeLoad( $this->context, (array)$modules, $only, $extraQuery ); } private static function makeContext( Context $mainContext, $group, $type, array $extraQuery = [] ): DerivativeContext { // Allow caller to setVersion() and setModules() $ret = new DerivativeContext( $mainContext ); // Set 'only' if not combined $ret->setOnly( $type === Module::TYPE_COMBINED ? null : $type ); // Remove user parameter in most cases if ( $group !== Module::GROUP_USER && $group !== Module::GROUP_PRIVATE ) { $ret->setUser( null ); } if ( isset( $extraQuery['raw'] ) ) { $ret->setRaw( true ); } return $ret; } /** * Explicitly load or embed modules on a page. * * @param Context $mainContext * @param string[] $modules One or more module names * @param string $only Module TYPE_ class constant * @param array $extraQuery [optional] Array with extra query parameters for the request * @return string|WrappedStringList HTML */ public static function makeLoad( Context $mainContext, array $modules, $only, array $extraQuery = [] ) { $rl = $mainContext->getResourceLoader(); $chunks = []; // Sort module names so requests are more uniform sort( $modules ); if ( $mainContext->getDebug() && count( $modules ) > 1 ) { // Recursively call us for every item foreach ( $modules as $name ) { $chunks[] = self::makeLoad( $mainContext, [ $name ], $only, $extraQuery ); } return new WrappedStringList( "\n", $chunks ); } // Create keyed-by-source and then keyed-by-group list of module objects from modules list $sortedModules = []; foreach ( $modules as $name ) { $module = $rl->getModule( $name ); if ( !$module ) { $rl->getLogger()->warning( 'Unknown module "{module}"', [ 'module' => $name ] ); continue; } $sortedModules[$module->getSource()][$module->getGroup()][$name] = $module; } foreach ( $sortedModules as $source => $groups ) { foreach ( $groups as $group => $grpModules ) { $context = self::makeContext( $mainContext, $group, $only, $extraQuery ); // Separate sets of linked and embedded modules while preserving order $moduleSets = []; $idx = -1; foreach ( $grpModules as $name => $module ) { $shouldEmbed = $module->shouldEmbedModule( $context ); if ( !$moduleSets || $moduleSets[$idx][0] !== $shouldEmbed ) { $moduleSets[++$idx] = [ $shouldEmbed, [] ]; } $moduleSets[$idx][1][$name] = $module; } // Link/embed each set foreach ( $moduleSets as [ $embed, $moduleSet ] ) { $moduleSetNames = array_keys( $moduleSet ); $context->setModules( $moduleSetNames ); if ( $embed ) { $response = $rl->makeModuleResponse( $context, $moduleSet ); // Decide whether to use style or script element if ( $only == Module::TYPE_STYLES ) { $chunks[] = Html::inlineStyle( $response ); } else { $chunks[] = ResourceLoader::makeInlineScript( $response ); } } else { // Not embedded // Special handling for the user group; because users might change their stuff // on-wiki like user pages, or user preferences; we need to find the highest // timestamp of these user-changeable modules so we can ensure cache misses on change // This should NOT be done for the site group (T29564) because anons get that too // and we shouldn't be putting timestamps in CDN-cached HTML if ( $group === Module::GROUP_USER ) { $context->setVersion( $rl->makeVersionQuery( $context, $moduleSetNames ) ); } // Must setModules() before createLoaderURL() $url = $rl->createLoaderURL( $source, $context, $extraQuery ); // Decide whether to use 'style' or 'script' element if ( $only === Module::TYPE_STYLES ) { $chunk = Html::linkedStyle( $url ); } elseif ( $context->getRaw() ) { // This request is asking for the module to be delivered standalone, // (aka "raw") without communicating to any mw.loader client. // For: // - startup (naturally because this is what will define mw.loader) $chunk = Html::element( 'script', [ 'async' => true, 'src' => $url, ] ); } else { $chunk = ResourceLoader::makeInlineScript( 'mw.loader.load(' . $mainContext->encodeJson( $url ) . ');' ); } if ( $group == Module::GROUP_NOSCRIPT ) { $chunks[] = Html::rawElement( 'noscript', [], $chunk ); } else { $chunks[] = $chunk; } } } } } return new WrappedStringList( "\n", $chunks ); } }
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