3 * Base class for resource loading system.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
21 * @author Roan Kattouw
22 * @author Trevor Parscal
25 use Psr\Log\LoggerAwareInterface
;
26 use Psr\Log\LoggerInterface
;
27 use Psr\Log\NullLogger
;
28 use WrappedString\WrappedString
;
31 * Dynamic JavaScript and CSS resource loading system.
33 * Most of the documentation is on the MediaWiki documentation wiki starting at:
34 * https://www.mediawiki.org/wiki/ResourceLoader
36 class ResourceLoader
implements LoggerAwareInterface
{
38 protected static $filterCacheVersion = 7;
41 protected static $debugMode = null;
44 private static $lessVars = null;
47 * Module name/ResourceLoaderModule object pairs
50 protected $modules = array();
53 * Associative array mapping module name to info associative array
56 protected $moduleInfos = array();
58 /** @var Config $config */
62 * Associative array mapping framework ids to a list of names of test suite modules
63 * like array( 'qunit' => array( 'mediawiki.tests.qunit.suites', 'ext.foo.tests', .. ), .. )
66 protected $testModuleNames = array();
69 * E.g. array( 'source-id' => 'http://.../load.php' )
72 protected $sources = array();
75 * Errors accumulated during current respond() call.
78 protected $errors = array();
81 * @var MessageBlobStore
86 * @var LoggerInterface
91 * Load information stored in the database about modules.
93 * This method grabs modules dependencies from the database and updates modules
96 * This is not inside the module code because it is much faster to
97 * request all of the information at once than it is to have each module
98 * requests its own information. This sacrifice of modularity yields a substantial
99 * performance improvement.
101 * @param array $modules List of module names to preload information for
102 * @param ResourceLoaderContext $context Context to load the information within
104 public function preloadModuleInfo( array $modules, ResourceLoaderContext
$context ) {
105 if ( !count( $modules ) ) {
106 // Or else Database*::select() will explode, plus it's cheaper!
109 $dbr = wfGetDB( DB_SLAVE
);
110 $skin = $context->getSkin();
111 $lang = $context->getLanguage();
113 // Batched version of ResourceLoaderModule::getFileDependencies
114 $vary = "$skin|$lang";
115 $res = $dbr->select( 'module_deps', array( 'md_module', 'md_deps' ), array(
116 'md_module' => $modules,
120 // Prime in-object cache values for each module
121 $modulesWithDeps = array();
122 foreach ( $res as $row ) {
123 $module = $this->getModule( $row->md_module
);
125 $module->setFileDependencies( $context, FormatJson
::decode( $row->md_deps
, true ) );
126 $modulesWithDeps[] = $row->md_module
;
129 // Register the absence of a dependency row too
130 foreach ( array_diff( $modules, $modulesWithDeps ) as $name ) {
131 $module = $this->getModule( $name );
133 $this->getModule( $name )->setFileDependencies( $context, array() );
137 // Get message blob mtimes. Only do this for modules with messages
138 $modulesWithMessages = array();
139 foreach ( $modules as $name ) {
140 $module = $this->getModule( $name );
141 if ( $module && count( $module->getMessages() ) ) {
142 $modulesWithMessages[] = $name;
145 $modulesWithoutMessages = array_flip( $modules ); // Will be trimmed down by the loop below
146 if ( count( $modulesWithMessages ) ) {
147 $res = $dbr->select( 'msg_resource', array( 'mr_resource', 'mr_timestamp' ), array(
148 'mr_resource' => $modulesWithMessages,
152 foreach ( $res as $row ) {
153 $module = $this->getModule( $row->mr_resource
);
155 $module->setMsgBlobMtime( $lang, wfTimestamp( TS_UNIX
, $row->mr_timestamp
) );
156 unset( $modulesWithoutMessages[$row->mr_resource
] );
160 foreach ( array_keys( $modulesWithoutMessages ) as $name ) {
161 $module = $this->getModule( $name );
163 $module->setMsgBlobMtime( $lang, 1 );
169 * Run JavaScript or CSS data through a filter, caching the filtered result for future calls.
171 * Available filters are:
173 * - minify-js \see JavaScriptMinifier::minify
174 * - minify-css \see CSSMin::minify
176 * If $data is empty, only contains whitespace or the filter was unknown,
177 * $data is returned unmodified.
179 * @param string $filter Name of filter to run
180 * @param string $data Text to filter, such as JavaScript or CSS text
181 * @param array $options For back-compat, can also be the boolean value for "cacheReport". Keys:
182 * - (bool) cache: Whether to allow caching this data. Default: true.
183 * - (bool) cacheReport: Whether to include the "cache key" report comment. Default: false.
184 * @return string Filtered data, or a comment containing an error message
186 public function filter( $filter, $data, $options = array() ) {
188 if ( is_bool( $options ) ) {
189 $options = array( 'cacheReport' => $options );
192 $options +
= array( 'cache' => true, 'cacheReport' => false );
193 $stats = RequestContext
::getMain()->getStats();
195 // Don't filter empty content
196 if ( trim( $data ) === '' ) {
200 if ( !in_array( $filter, array( 'minify-js', 'minify-css' ) ) ) {
201 $this->logger
->warning( 'Invalid filter {filter}', array(
207 if ( !$options['cache'] ) {
208 $result = self
::applyFilter( $filter, $data, $this->config
);
210 $key = wfGlobalCacheKey(
214 self
::$filterCacheVersion, md5( $data )
216 $cache = wfGetCache( wfIsHHVM() ? CACHE_ACCEL
: CACHE_ANYTHING
);
217 $cacheEntry = $cache->get( $key );
218 if ( is_string( $cacheEntry ) ) {
219 $stats->increment( "resourceloader_cache.$filter.hit" );
224 $statStart = microtime( true );
225 $result = self
::applyFilter( $filter, $data, $this->config
);
226 $statTiming = microtime( true ) - $statStart;
227 $stats->increment( "resourceloader_cache.$filter.miss" );
228 $stats->timing( "resourceloader_cache.$filter.timing", 1000 * $statTiming );
229 if ( $options['cacheReport'] ) {
230 $result .= "\n/* cache key: $key */";
232 // Set a TTL since HHVM's APC doesn't have any limitation or eviction logic.
233 $cache->set( $key, $result, 24 * 3600 );
234 } catch ( Exception
$e ) {
235 MWExceptionHandler
::logException( $e );
236 $this->logger
->warning( 'Minification failed: {exception}', array(
239 $this->errors
[] = self
::formatExceptionNoComment( $e );
246 private static function applyFilter( $filter, $data, Config
$config ) {
249 return JavaScriptMinifier
::minify( $data );
251 return CSSMin
::minify( $data );
260 * Register core modules and runs registration hooks.
261 * @param Config|null $config
263 public function __construct( Config
$config = null, LoggerInterface
$logger = null ) {
267 $logger = new NullLogger();
269 $this->setLogger( $logger );
272 $this->logger
->debug( __METHOD__
. ' was called without providing a Config instance' );
273 $config = ConfigFactory
::getDefaultInstance()->makeConfig( 'main' );
275 $this->config
= $config;
277 // Add 'local' source first
278 $this->addSource( 'local', wfScript( 'load' ) );
281 $this->addSource( $config->get( 'ResourceLoaderSources' ) );
283 // Register core modules
284 $this->register( include "$IP/resources/Resources.php" );
285 $this->register( include "$IP/resources/ResourcesOOUI.php" );
286 // Register extension modules
287 $this->register( $config->get( 'ResourceModules' ) );
288 Hooks
::run( 'ResourceLoaderRegisterModules', array( &$this ) );
290 if ( $config->get( 'EnableJavaScriptTest' ) === true ) {
291 $this->registerTestModules();
294 $this->setMessageBlobStore( new MessageBlobStore() );
300 public function getConfig() {
301 return $this->config
;
304 public function setLogger( LoggerInterface
$logger ) {
305 $this->logger
= $logger;
310 * @return MessageBlobStore
312 public function getMessageBlobStore() {
313 return $this->blobStore
;
318 * @param MessageBlobStore $blobStore
320 public function setMessageBlobStore( MessageBlobStore
$blobStore ) {
321 $this->blobStore
= $blobStore;
325 * Register a module with the ResourceLoader system.
327 * @param mixed $name Name of module as a string or List of name/object pairs as an array
328 * @param array $info Module info array. For backwards compatibility with 1.17alpha,
329 * this may also be a ResourceLoaderModule object. Optional when using
330 * multiple-registration calling style.
331 * @throws MWException If a duplicate module registration is attempted
332 * @throws MWException If a module name contains illegal characters (pipes or commas)
333 * @throws MWException If something other than a ResourceLoaderModule is being registered
334 * @return bool False if there were any errors, in which case one or more modules were
337 public function register( $name, $info = null ) {
339 // Allow multiple modules to be registered in one call
340 $registrations = is_array( $name ) ?
$name : array( $name => $info );
341 foreach ( $registrations as $name => $info ) {
342 // Disallow duplicate registrations
343 if ( isset( $this->moduleInfos
[$name] ) ) {
344 // A module has already been registered by this name
345 throw new MWException(
346 'ResourceLoader duplicate registration error. ' .
347 'Another module has already been registered as ' . $name
351 // Check $name for validity
352 if ( !self
::isValidModuleName( $name ) ) {
353 throw new MWException( "ResourceLoader module name '$name' is invalid, "
354 . "see ResourceLoader::isValidModuleName()" );
358 if ( $info instanceof ResourceLoaderModule
) {
359 $this->moduleInfos
[$name] = array( 'object' => $info );
360 $info->setName( $name );
361 $this->modules
[$name] = $info;
362 } elseif ( is_array( $info ) ) {
363 // New calling convention
364 $this->moduleInfos
[$name] = $info;
366 throw new MWException(
367 'ResourceLoader module info type error for module \'' . $name .
368 '\': expected ResourceLoaderModule or array (got: ' . gettype( $info ) . ')'
372 // Last-minute changes
374 // Apply custom skin-defined styles to existing modules.
375 if ( $this->isFileModule( $name ) ) {
376 foreach ( $this->config
->get( 'ResourceModuleSkinStyles' ) as $skinName => $skinStyles ) {
377 // If this module already defines skinStyles for this skin, ignore $wgResourceModuleSkinStyles.
378 if ( isset( $this->moduleInfos
[$name]['skinStyles'][$skinName] ) ) {
382 // If $name is preceded with a '+', the defined style files will be added to 'default'
383 // skinStyles, otherwise 'default' will be ignored as it normally would be.
384 if ( isset( $skinStyles[$name] ) ) {
385 $paths = (array)$skinStyles[$name];
386 $styleFiles = array();
387 } elseif ( isset( $skinStyles['+' . $name] ) ) {
388 $paths = (array)$skinStyles['+' . $name];
389 $styleFiles = isset( $this->moduleInfos
[$name]['skinStyles']['default'] ) ?
390 (array)$this->moduleInfos
[$name]['skinStyles']['default'] :
396 // Add new file paths, remapping them to refer to our directories and not use settings
397 // from the module we're modifying, which come from the base definition.
398 list( $localBasePath, $remoteBasePath ) =
399 ResourceLoaderFileModule
::extractBasePaths( $skinStyles );
401 foreach ( $paths as $path ) {
402 $styleFiles[] = new ResourceLoaderFilePath( $path, $localBasePath, $remoteBasePath );
405 $this->moduleInfos
[$name]['skinStyles'][$skinName] = $styleFiles;
414 public function registerTestModules() {
417 if ( $this->config
->get( 'EnableJavaScriptTest' ) !== true ) {
418 throw new MWException( 'Attempt to register JavaScript test modules '
419 . 'but <code>$wgEnableJavaScriptTest</code> is false. '
420 . 'Edit your <code>LocalSettings.php</code> to enable it.' );
423 // Get core test suites
424 $testModules = array();
425 $testModules['qunit'] = array();
426 // Get other test suites (e.g. from extensions)
427 Hooks
::run( 'ResourceLoaderTestModules', array( &$testModules, &$this ) );
429 // Add the testrunner (which configures QUnit) to the dependencies.
430 // Since it must be ready before any of the test suites are executed.
431 foreach ( $testModules['qunit'] as &$module ) {
432 // Make sure all test modules are top-loading so that when QUnit starts
433 // on document-ready, it will run once and finish. If some tests arrive
434 // later (possibly after QUnit has already finished) they will be ignored.
435 $module['position'] = 'top';
436 $module['dependencies'][] = 'test.mediawiki.qunit.testrunner';
439 $testModules['qunit'] =
440 ( include "$IP/tests/qunit/QUnitTestResources.php" ) +
$testModules['qunit'];
442 foreach ( $testModules as $id => $names ) {
443 // Register test modules
444 $this->register( $testModules[$id] );
446 // Keep track of their names so that they can be loaded together
447 $this->testModuleNames
[$id] = array_keys( $testModules[$id] );
453 * Add a foreign source of modules.
455 * @param array|string $id Source ID (string), or array( id1 => loadUrl, id2 => loadUrl, ... )
456 * @param string|array $loadUrl load.php url (string), or array with loadUrl key for
457 * backwards-compatibility.
458 * @throws MWException
460 public function addSource( $id, $loadUrl = null ) {
461 // Allow multiple sources to be registered in one call
462 if ( is_array( $id ) ) {
463 foreach ( $id as $key => $value ) {
464 $this->addSource( $key, $value );
469 // Disallow duplicates
470 if ( isset( $this->sources
[$id] ) ) {
471 throw new MWException(
472 'ResourceLoader duplicate source addition error. ' .
473 'Another source has already been registered as ' . $id
477 // Pre 1.24 backwards-compatibility
478 if ( is_array( $loadUrl ) ) {
479 if ( !isset( $loadUrl['loadScript'] ) ) {
480 throw new MWException(
481 __METHOD__
. ' was passed an array with no "loadScript" key.'
485 $loadUrl = $loadUrl['loadScript'];
488 $this->sources
[$id] = $loadUrl;
492 * Get a list of module names.
494 * @return array List of module names
496 public function getModuleNames() {
497 return array_keys( $this->moduleInfos
);
501 * Get a list of test module names for one (or all) frameworks.
503 * If the given framework id is unknkown, or if the in-object variable is not an array,
504 * then it will return an empty array.
506 * @param string $framework Get only the test module names for one
507 * particular framework (optional)
510 public function getTestModuleNames( $framework = 'all' ) {
511 /** @todo api siteinfo prop testmodulenames modulenames */
512 if ( $framework == 'all' ) {
513 return $this->testModuleNames
;
514 } elseif ( isset( $this->testModuleNames
[$framework] )
515 && is_array( $this->testModuleNames
[$framework] )
517 return $this->testModuleNames
[$framework];
524 * Check whether a ResourceLoader module is registered
527 * @param string $name
530 public function isModuleRegistered( $name ) {
531 return isset( $this->moduleInfos
[$name] );
535 * Get the ResourceLoaderModule object for a given module name.
537 * If an array of module parameters exists but a ResourceLoaderModule object has not
538 * yet been instantiated, this method will instantiate and cache that object such that
539 * subsequent calls simply return the same object.
541 * @param string $name Module name
542 * @return ResourceLoaderModule|null If module has been registered, return a
543 * ResourceLoaderModule instance. Otherwise, return null.
545 public function getModule( $name ) {
546 if ( !isset( $this->modules
[$name] ) ) {
547 if ( !isset( $this->moduleInfos
[$name] ) ) {
551 // Construct the requested object
552 $info = $this->moduleInfos
[$name];
553 /** @var ResourceLoaderModule $object */
554 if ( isset( $info['object'] ) ) {
555 // Object given in info array
556 $object = $info['object'];
558 if ( !isset( $info['class'] ) ) {
559 $class = 'ResourceLoaderFileModule';
561 $class = $info['class'];
563 /** @var ResourceLoaderModule $object */
564 $object = new $class( $info );
565 $object->setConfig( $this->getConfig() );
567 $object->setName( $name );
568 $this->modules
[$name] = $object;
571 return $this->modules
[$name];
575 * Return whether the definition of a module corresponds to a simple ResourceLoaderFileModule.
577 * @param string $name Module name
580 protected function isFileModule( $name ) {
581 if ( !isset( $this->moduleInfos
[$name] ) ) {
584 $info = $this->moduleInfos
[$name];
585 if ( isset( $info['object'] ) ||
isset( $info['class'] ) ) {
592 * Get the list of sources.
594 * @return array Like array( id => load.php url, .. )
596 public function getSources() {
597 return $this->sources
;
601 * Get the URL to the load.php endpoint for the given
602 * ResourceLoader source
605 * @param string $source
606 * @throws MWException On an invalid $source name
609 public function getLoadScript( $source ) {
610 if ( !isset( $this->sources
[$source] ) ) {
611 throw new MWException( "The $source source was never registered in ResourceLoader." );
613 return $this->sources
[$source];
618 * @param string $value
619 * @return string Hash
621 public static function makeHash( $value ) {
622 // Use base64 to output more entropy in a more compact string (default hex is only base16).
623 // The first 8 chars of a base64 encoded digest represent the same binary as
624 // the first 12 chars of a hex encoded digest.
625 return substr( base64_encode( sha1( $value, true ) ), 0, 8 );
629 * Helper method to get and combine versions of multiple modules.
632 * @param ResourceLoaderContext $context
633 * @param array $modules List of ResourceLoaderModule objects
634 * @return string Hash
636 public function getCombinedVersion( ResourceLoaderContext
$context, Array $modules ) {
640 // Support: PHP 5.3 ("$this" for anonymous functions was added in PHP 5.4.0)
641 // http://php.net/functions.anonymous
643 $hashes = array_map( function ( $module ) use ( $rl, $context ) {
644 return $rl->getModule( $module )->getVersionHash( $context );
646 return self
::makeHash( implode( $hashes ) );
650 * Output a response to a load request, including the content-type header.
652 * @param ResourceLoaderContext $context Context in which a response should be formed
654 public function respond( ResourceLoaderContext
$context ) {
655 // Buffer output to catch warnings. Normally we'd use ob_clean() on the
656 // top-level output buffer to clear warnings, but that breaks when ob_gzhandler
657 // is used: ob_clean() will clear the GZIP header in that case and it won't come
658 // back for subsequent output, resulting in invalid GZIP. So we have to wrap
659 // the whole thing in our own output buffer to be sure the active buffer
660 // doesn't use ob_gzhandler.
661 // See http://bugs.php.net/bug.php?id=36514
664 // Find out which modules are missing and instantiate the others
667 foreach ( $context->getModules() as $name ) {
668 $module = $this->getModule( $name );
670 // Do not allow private modules to be loaded from the web.
671 // This is a security issue, see bug 34907.
672 if ( $module->getGroup() === 'private' ) {
673 $this->logger
->debug( "Request for private module '$name' denied" );
674 $this->errors
[] = "Cannot show private module \"$name\"";
677 $modules[$name] = $module;
684 // Preload for getCombinedVersion()
685 $this->preloadModuleInfo( array_keys( $modules ), $context );
686 } catch ( Exception
$e ) {
687 MWExceptionHandler
::logException( $e );
688 $this->logger
->warning( 'Preloading module info failed: {exception}', array(
691 $this->errors
[] = self
::formatExceptionNoComment( $e );
694 // Combine versions to propagate cache invalidation
697 $versionHash = $this->getCombinedVersion( $context, array_keys( $modules ) );
698 } catch ( Exception
$e ) {
699 MWExceptionHandler
::logException( $e );
700 $this->logger
->warning( 'Calculating version hash failed: {exception}', array(
703 $this->errors
[] = self
::formatExceptionNoComment( $e );
706 // See RFC 2616 § 3.11 Entity Tags
707 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11
708 $etag = 'W/"' . $versionHash . '"';
710 // Try the client-side cache first
711 if ( $this->tryRespondNotModified( $context, $etag ) ) {
712 return; // output handled (buffers cleared)
715 // Use file cache if enabled and available...
716 if ( $this->config
->get( 'UseFileCache' ) ) {
717 $fileCache = ResourceFileCache
::newFromContext( $context );
718 if ( $this->tryRespondFromFileCache( $fileCache, $context, $etag ) ) {
719 return; // output handled
723 // Generate a response
724 $response = $this->makeModuleResponse( $context, $modules, $missing );
726 // Capture any PHP warnings from the output buffer and append them to the
727 // error list if we're in debug mode.
728 if ( $context->getDebug() && strlen( $warnings = ob_get_contents() ) ) {
729 $this->errors
[] = $warnings;
732 // Save response to file cache unless there are errors
733 if ( isset( $fileCache ) && !$this->errors
&& !count( $missing ) ) {
734 // Cache single modules and images...and other requests if there are enough hits
735 if ( ResourceFileCache
::useFileCache( $context ) ) {
736 if ( $fileCache->isCacheWorthy() ) {
737 $fileCache->saveText( $response );
739 $fileCache->incrMissesRecent( $context->getRequest() );
744 $this->sendResponseHeaders( $context, $etag, (bool)$this->errors
);
746 // Remove the output buffer and output the response
749 if ( $context->getImageObj() && $this->errors
) {
750 // We can't show both the error messages and the response when it's an image.
751 $response = implode( "\n\n", $this->errors
);
752 } elseif ( $this->errors
) {
753 $errorText = implode( "\n\n", $this->errors
);
754 $errorResponse = self
::makeComment( $errorText );
755 if ( $context->shouldIncludeScripts() ) {
756 $errorResponse .= 'if (window.console && console.error) {'
757 . Xml
::encodeJsCall( 'console.error', array( $errorText ) )
761 // Prepend error info to the response
762 $response = $errorResponse . $response;
765 $this->errors
= array();
771 * Send main response headers to the client.
773 * Deals with Content-Type, CORS (for stylesheets), and caching.
775 * @param ResourceLoaderContext $context
776 * @param string $etag ETag header value
777 * @param bool $errors Whether there are errors in the response
780 protected function sendResponseHeaders( ResourceLoaderContext
$context, $etag, $errors ) {
781 $rlMaxage = $this->config
->get( 'ResourceLoaderMaxage' );
782 // If a version wasn't specified we need a shorter expiry time for updates
783 // to propagate to clients quickly
784 // If there were errors, we also need a shorter expiry time so we can recover quickly
785 if ( is_null( $context->getVersion() ) ||
$errors ) {
786 $maxage = $rlMaxage['unversioned']['client'];
787 $smaxage = $rlMaxage['unversioned']['server'];
788 // If a version was specified we can use a longer expiry time since changing
789 // version numbers causes cache misses
791 $maxage = $rlMaxage['versioned']['client'];
792 $smaxage = $rlMaxage['versioned']['server'];
794 if ( $context->getImageObj() ) {
795 // Output different headers if we're outputting textual errors.
797 header( 'Content-Type: text/plain; charset=utf-8' );
799 $context->getImageObj()->sendResponseHeaders( $context );
801 } elseif ( $context->getOnly() === 'styles' ) {
802 header( 'Content-Type: text/css; charset=utf-8' );
803 header( 'Access-Control-Allow-Origin: *' );
805 header( 'Content-Type: text/javascript; charset=utf-8' );
807 // See RFC 2616 § 14.19 ETag
808 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19
809 header( 'ETag: ' . $etag );
810 if ( $context->getDebug() ) {
811 // Do not cache debug responses
812 header( 'Cache-Control: private, no-cache, must-revalidate' );
813 header( 'Pragma: no-cache' );
815 header( "Cache-Control: public, max-age=$maxage, s-maxage=$smaxage" );
816 $exp = min( $maxage, $smaxage );
817 header( 'Expires: ' . wfTimestamp( TS_RFC2822
, $exp +
time() ) );
820 // Send the current time expressed as fractional seconds since epoch,
821 // with microsecond precision. This helps distinguish hits from misses
823 header( 'MediaWiki-Timestamp: ' . microtime( true ) );
827 * Respond with HTTP 304 Not Modified if appropiate.
829 * If there's an If-None-Match header, respond with a 304 appropriately
830 * and clear out the output buffer. If the client cache is too old then do nothing.
832 * @param ResourceLoaderContext $context
833 * @param string $etag ETag header value
834 * @return bool True if HTTP 304 was sent and output handled
836 protected function tryRespondNotModified( ResourceLoaderContext
$context, $etag ) {
837 // See RFC 2616 § 14.26 If-None-Match
838 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26
839 $clientKeys = $context->getRequest()->getHeader( 'If-None-Match', WebRequest
::GETHEADER_LIST
);
840 // Never send 304s in debug mode
841 if ( $clientKeys !== false && !$context->getDebug() && in_array( $etag, $clientKeys ) ) {
842 // There's another bug in ob_gzhandler (see also the comment at
843 // the top of this function) that causes it to gzip even empty
844 // responses, meaning it's impossible to produce a truly empty
845 // response (because the gzip header is always there). This is
846 // a problem because 304 responses have to be completely empty
847 // per the HTTP spec, and Firefox behaves buggily when they're not.
848 // See also http://bugs.php.net/bug.php?id=51579
849 // To work around this, we tear down all output buffering before
851 wfResetOutputBuffers( /* $resetGzipEncoding = */ true );
853 HttpStatus
::header( 304 );
855 $this->sendResponseHeaders( $context, $etag, false );
862 * Send out code for a response from file cache if possible.
864 * @param ResourceFileCache $fileCache Cache object for this request URL
865 * @param ResourceLoaderContext $context Context in which to generate a response
866 * @param string $etag ETag header value
867 * @return bool If this found a cache file and handled the response
869 protected function tryRespondFromFileCache(
870 ResourceFileCache
$fileCache,
871 ResourceLoaderContext
$context,
874 $rlMaxage = $this->config
->get( 'ResourceLoaderMaxage' );
875 // Buffer output to catch warnings.
877 // Get the maximum age the cache can be
878 $maxage = is_null( $context->getVersion() )
879 ?
$rlMaxage['unversioned']['server']
880 : $rlMaxage['versioned']['server'];
881 // Minimum timestamp the cache file must have
882 $good = $fileCache->isCacheGood( wfTimestamp( TS_MW
, time() - $maxage ) );
884 try { // RL always hits the DB on file cache miss...
886 } catch ( DBConnectionError
$e ) { // ...check if we need to fallback to cache
887 $good = $fileCache->isCacheGood(); // cache existence check
891 $ts = $fileCache->cacheTimestamp();
892 // Send content type and cache headers
893 $this->sendResponseHeaders( $context, $etag, false );
894 $response = $fileCache->fetchText();
895 // Capture any PHP warnings from the output buffer and append them to the
896 // response in a comment if we're in debug mode.
897 if ( $context->getDebug() && strlen( $warnings = ob_get_contents() ) ) {
898 $response = self
::makeComment( $warnings ) . $response;
900 // Remove the output buffer and output the response
902 echo $response . "\n/* Cached {$ts} */";
903 return true; // cache hit
908 return false; // cache miss
912 * Generate a CSS or JS comment block.
914 * Only use this for public data, not error message details.
916 * @param string $text
919 public static function makeComment( $text ) {
920 $encText = str_replace( '*/', '* /', $text );
921 return "/*\n$encText\n*/\n";
925 * Handle exception display.
927 * @param Exception $e Exception to be shown to the user
928 * @return string Sanitized text in a CSS/JS comment that can be returned to the user
930 public static function formatException( $e ) {
931 return self
::makeComment( self
::formatExceptionNoComment( $e ) );
935 * Handle exception display.
938 * @param Exception $e Exception to be shown to the user
939 * @return string Sanitized text that can be returned to the user
941 protected static function formatExceptionNoComment( $e ) {
942 global $wgShowExceptionDetails;
944 if ( !$wgShowExceptionDetails ) {
945 return MWExceptionHandler
::getPublicLogMessage( $e );
948 return MWExceptionHandler
::getLogMessage( $e );
952 * Generate code for a response.
954 * @param ResourceLoaderContext $context Context in which to generate a response
955 * @param ResourceLoaderModule[] $modules List of module objects keyed by module name
956 * @param string[] $missing List of requested module names that are unregistered (optional)
957 * @return string Response data
959 public function makeModuleResponse( ResourceLoaderContext
$context,
960 array $modules, array $missing = array()
965 if ( !count( $modules ) && !count( $missing ) ) {
967 /* This file is the Web entry point for MediaWiki's ResourceLoader:
968 <https://www.mediawiki.org/wiki/ResourceLoader>. In this request,
969 no modules were requested. Max made me put this here. */
973 $image = $context->getImageObj();
975 $data = $image->getImageData( $context );
976 if ( $data === false ) {
978 $this->errors
[] = 'Image generation failed';
984 if ( $context->shouldIncludeMessages() ) {
986 $this->blobStore
->get( $this, $modules, $context->getLanguage() );
987 } catch ( Exception
$e ) {
988 MWExceptionHandler
::logException( $e );
989 $this->logger
->warning( 'Prefetching MessageBlobStore failed: {exception}', array(
992 $this->errors
[] = self
::formatExceptionNoComment( $e );
996 foreach ( $missing as $name ) {
997 $states[$name] = 'missing';
1002 foreach ( $modules as $name => $module ) {
1004 $content = $module->getModuleContent( $context );
1007 switch ( $context->getOnly() ) {
1009 $scripts = $content['scripts'];
1010 if ( is_string( $scripts ) ) {
1011 // Load scripts raw...
1013 } elseif ( is_array( $scripts ) ) {
1014 // ...except when $scripts is an array of URLs
1015 $out .= self
::makeLoaderImplementScript( $name, $scripts, array(), array(), array() );
1019 $styles = $content['styles'];
1020 // We no longer seperate into media, they are all combined now with
1021 // custom media type groups into @media .. {} sections as part of the css string.
1022 // Module returns either an empty array or a numerical array with css strings.
1023 $out .= isset( $styles['css'] ) ?
implode( '', $styles['css'] ) : '';
1026 $out .= self
::makeLoaderImplementScript(
1028 isset( $content['scripts'] ) ?
$content['scripts'] : '',
1029 isset( $content['styles'] ) ?
$content['styles'] : array(),
1030 isset( $content['messagesBlob'] ) ?
new XmlJsCode( $content['messagesBlob'] ) : array(),
1031 isset( $content['templates'] ) ?
$content['templates'] : array()
1035 } catch ( Exception
$e ) {
1036 MWExceptionHandler
::logException( $e );
1037 $this->logger
->warning( 'Generating module package failed: {exception}', array(
1040 $this->errors
[] = self
::formatExceptionNoComment( $e );
1042 // Respond to client with error-state instead of module implementation
1043 $states[$name] = 'error';
1044 unset( $modules[$name] );
1046 $isRaw |
= $module->isRaw();
1049 // Update module states
1050 if ( $context->shouldIncludeScripts() && !$context->getRaw() && !$isRaw ) {
1051 if ( count( $modules ) && $context->getOnly() === 'scripts' ) {
1052 // Set the state of modules loaded as only scripts to ready as
1053 // they don't have an mw.loader.implement wrapper that sets the state
1054 foreach ( $modules as $name => $module ) {
1055 $states[$name] = 'ready';
1059 // Set the state of modules we didn't respond to with mw.loader.implement
1060 if ( count( $states ) ) {
1061 $out .= self
::makeLoaderStateScript( $states );
1064 if ( count( $states ) ) {
1065 $this->errors
[] = 'Problematic modules: ' .
1066 FormatJson
::encode( $states, ResourceLoader
::inDebugMode() );
1070 $enableFilterCache = true;
1071 if ( count( $modules ) === 1 && reset( $modules ) instanceof ResourceLoaderUserTokensModule
) {
1072 // If we're building the embedded user.tokens, don't cache (T84960)
1073 $enableFilterCache = false;
1076 if ( !$context->getDebug() ) {
1077 if ( $context->getOnly() === 'styles' ) {
1078 $out = $this->filter( 'minify-css', $out );
1080 $out = $this->filter( 'minify-js', $out, array(
1081 'cache' => $enableFilterCache
1089 /* Static Methods */
1092 * Return JS code that calls mw.loader.implement with given module properties.
1094 * @param string $name Module name
1095 * @param mixed $scripts List of URLs to JavaScript files or String of JavaScript code
1096 * @param mixed $styles Array of CSS strings keyed by media type, or an array of lists of URLs
1097 * to CSS files keyed by media type
1098 * @param mixed $messages List of messages associated with this module. May either be an
1099 * associative array mapping message key to value, or a JSON-encoded message blob containing
1100 * the same data, wrapped in an XmlJsCode object.
1101 * @param array $templates Keys are name of templates and values are the source of
1103 * @throws MWException
1106 public static function makeLoaderImplementScript(
1107 $name, $scripts, $styles, $messages, $templates
1109 if ( is_string( $scripts ) ) {
1110 // Site and user module are a legacy scripts that run in the global scope (no closure).
1111 // Transportation as string instructs mw.loader.implement to use globalEval.
1112 if ( $name === 'site' ||
$name === 'user' ) {
1113 // Minify manually because the general makeModuleResponse() minification won't be
1114 // effective here due to the script being a string instead of a function. (T107377)
1115 if ( !ResourceLoader
::inDebugMode() ) {
1116 $scripts = self
::applyFilter( 'minify-js', $scripts,
1117 ConfigFactory
::getDefaultInstance()->makeConfig( 'main' ) );
1120 $scripts = new XmlJsCode( "function ( $, jQuery ) {\n{$scripts}\n}" );
1122 } elseif ( !is_array( $scripts ) ) {
1123 throw new MWException( 'Invalid scripts error. Array of URLs or string of code expected.' );
1125 // mw.loader.implement requires 'styles', 'messages' and 'templates' to be objects (not
1126 // arrays). json_encode considers empty arrays to be numerical and outputs "[]" instead
1127 // of "{}". Force them to objects.
1135 self
::trimArray( $module );
1137 return Xml
::encodeJsCall( 'mw.loader.implement', $module, ResourceLoader
::inDebugMode() );
1141 * Returns JS code which, when called, will register a given list of messages.
1143 * @param mixed $messages Either an associative array mapping message key to value, or a
1144 * JSON-encoded message blob containing the same data, wrapped in an XmlJsCode object.
1147 public static function makeMessageSetScript( $messages ) {
1148 return Xml
::encodeJsCall(
1150 array( (object)$messages ),
1151 ResourceLoader
::inDebugMode()
1156 * Combines an associative array mapping media type to CSS into a
1157 * single stylesheet with "@media" blocks.
1159 * @param array $stylePairs Array keyed by media type containing (arrays of) CSS strings
1162 public static function makeCombinedStyles( array $stylePairs ) {
1164 foreach ( $stylePairs as $media => $styles ) {
1165 // ResourceLoaderFileModule::getStyle can return the styles
1166 // as a string or an array of strings. This is to allow separation in
1168 $styles = (array)$styles;
1169 foreach ( $styles as $style ) {
1170 $style = trim( $style );
1171 // Don't output an empty "@media print { }" block (bug 40498)
1172 if ( $style !== '' ) {
1173 // Transform the media type based on request params and config
1174 // The way that this relies on $wgRequest to propagate request params is slightly evil
1175 $media = OutputPage
::transformCssMedia( $media );
1177 if ( $media === '' ||
$media == 'all' ) {
1179 } elseif ( is_string( $media ) ) {
1180 $out[] = "@media $media {\n" . str_replace( "\n", "\n\t", "\t" . $style ) . "}";
1190 * Returns a JS call to mw.loader.state, which sets the state of a
1191 * module or modules to a given value. Has two calling conventions:
1193 * - ResourceLoader::makeLoaderStateScript( $name, $state ):
1194 * Set the state of a single module called $name to $state
1196 * - ResourceLoader::makeLoaderStateScript( array( $name => $state, ... ) ):
1197 * Set the state of modules with the given names to the given states
1199 * @param string $name
1200 * @param string $state
1203 public static function makeLoaderStateScript( $name, $state = null ) {
1204 if ( is_array( $name ) ) {
1205 return Xml
::encodeJsCall(
1208 ResourceLoader
::inDebugMode()
1211 return Xml
::encodeJsCall(
1213 array( $name, $state ),
1214 ResourceLoader
::inDebugMode()
1220 * Returns JS code which calls the script given by $script. The script will
1221 * be called with local variables name, version, dependencies and group,
1222 * which will have values corresponding to $name, $version, $dependencies
1223 * and $group as supplied.
1225 * @param string $name Module name
1226 * @param string $version Module version hash
1227 * @param array $dependencies List of module names on which this module depends
1228 * @param string $group Group which the module is in.
1229 * @param string $source Source of the module, or 'local' if not foreign.
1230 * @param string $script JavaScript code
1233 public static function makeCustomLoaderScript( $name, $version, $dependencies,
1234 $group, $source, $script
1236 $script = str_replace( "\n", "\n\t", trim( $script ) );
1237 return Xml
::encodeJsCall(
1238 "( function ( name, version, dependencies, group, source ) {\n\t$script\n} )",
1239 array( $name, $version, $dependencies, $group, $source ),
1240 ResourceLoader
::inDebugMode()
1244 private static function isEmptyObject( stdClass
$obj ) {
1245 foreach ( $obj as $key => $value ) {
1252 * Remove empty values from the end of an array.
1254 * Values considered empty:
1258 * - new XmlJsCode( '{}' )
1259 * - new stdClass() // (object) array()
1261 * @param Array $array
1263 private static function trimArray( Array &$array ) {
1264 $i = count( $array );
1266 if ( $array[$i] === null
1267 ||
$array[$i] === array()
1268 ||
( $array[$i] instanceof XmlJsCode
&& $array[$i]->value
=== '{}' )
1269 ||
( $array[$i] instanceof stdClass
&& self
::isEmptyObject( $array[$i] ) )
1271 unset( $array[$i] );
1279 * Returns JS code which calls mw.loader.register with the given
1280 * parameters. Has three calling conventions:
1282 * - ResourceLoader::makeLoaderRegisterScript( $name, $version,
1283 * $dependencies, $group, $source, $skip
1285 * Register a single module.
1287 * - ResourceLoader::makeLoaderRegisterScript( array( $name1, $name2 ) ):
1288 * Register modules with the given names.
1290 * - ResourceLoader::makeLoaderRegisterScript( array(
1291 * array( $name1, $version1, $dependencies1, $group1, $source1, $skip1 ),
1292 * array( $name2, $version2, $dependencies1, $group2, $source2, $skip2 ),
1295 * Registers modules with the given names and parameters.
1297 * @param string $name Module name
1298 * @param string $version Module version hash
1299 * @param array $dependencies List of module names on which this module depends
1300 * @param string $group Group which the module is in
1301 * @param string $source Source of the module, or 'local' if not foreign
1302 * @param string $skip Script body of the skip function
1305 public static function makeLoaderRegisterScript( $name, $version = null,
1306 $dependencies = null, $group = null, $source = null, $skip = null
1308 if ( is_array( $name ) ) {
1309 // Build module name index
1311 foreach ( $name as $i => &$module ) {
1312 $index[$module[0]] = $i;
1315 // Transform dependency names into indexes when possible, they will be resolved by
1316 // mw.loader.register on the other end
1317 foreach ( $name as &$module ) {
1318 if ( isset( $module[2] ) ) {
1319 foreach ( $module[2] as &$dependency ) {
1320 if ( isset( $index[$dependency] ) ) {
1321 $dependency = $index[$dependency];
1327 array_walk( $name, array( 'self', 'trimArray' ) );
1329 return Xml
::encodeJsCall(
1330 'mw.loader.register',
1332 ResourceLoader
::inDebugMode()
1335 $registration = array( $name, $version, $dependencies, $group, $source, $skip );
1336 self
::trimArray( $registration );
1337 return Xml
::encodeJsCall(
1338 'mw.loader.register',
1340 ResourceLoader
::inDebugMode()
1346 * Returns JS code which calls mw.loader.addSource() with the given
1347 * parameters. Has two calling conventions:
1349 * - ResourceLoader::makeLoaderSourcesScript( $id, $properties ):
1350 * Register a single source
1352 * - ResourceLoader::makeLoaderSourcesScript( array( $id1 => $loadUrl, $id2 => $loadUrl, ... ) );
1353 * Register sources with the given IDs and properties.
1355 * @param string $id Source ID
1356 * @param array $properties Source properties (see addSource())
1359 public static function makeLoaderSourcesScript( $id, $properties = null ) {
1360 if ( is_array( $id ) ) {
1361 return Xml
::encodeJsCall(
1362 'mw.loader.addSource',
1364 ResourceLoader
::inDebugMode()
1367 return Xml
::encodeJsCall(
1368 'mw.loader.addSource',
1369 array( $id, $properties ),
1370 ResourceLoader
::inDebugMode()
1376 * Returns JS code which runs given JS code if the client-side framework is
1379 * @deprecated since 1.25; use makeInlineScript instead
1380 * @param string $script JavaScript code
1383 public static function makeLoaderConditionalScript( $script ) {
1384 return "window.RLQ = window.RLQ || []; window.RLQ.push( function () {\n" .
1385 trim( $script ) . "\n} );";
1389 * Construct an inline script tag with given JS code.
1391 * The code will be wrapped in a closure, and it will be executed by ResourceLoader
1392 * only if the client has adequate support for MediaWiki JavaScript code.
1394 * @param string $script JavaScript code
1395 * @return WrappedString HTML
1397 public static function makeInlineScript( $script ) {
1398 $js = self
::makeLoaderConditionalScript( $script );
1399 return new WrappedString(
1400 Html
::inlineScript( $js ),
1401 "<script>window.RLQ = window.RLQ || []; window.RLQ.push( function () {\n",
1407 * Returns JS code which will set the MediaWiki configuration array to
1410 * @param array $configuration List of configuration values keyed by variable name
1413 public static function makeConfigSetScript( array $configuration ) {
1414 if ( ResourceLoader
::inDebugMode() ) {
1415 return Xml
::encodeJsCall( 'mw.config.set', array( $configuration ), true );
1418 $config = RequestContext
::getMain()->getConfig();
1419 $js = Xml
::encodeJsCall( 'mw.config.set', array( $configuration ), false );
1420 return self
::applyFilter( 'minify-js', $js, $config );
1424 * Convert an array of module names to a packed query string.
1426 * For example, array( 'foo.bar', 'foo.baz', 'bar.baz', 'bar.quux' )
1427 * becomes 'foo.bar,baz|bar.baz,quux'
1428 * @param array $modules List of module names (strings)
1429 * @return string Packed query string
1431 public static function makePackedModulesString( $modules ) {
1432 $groups = array(); // array( prefix => array( suffixes ) )
1433 foreach ( $modules as $module ) {
1434 $pos = strrpos( $module, '.' );
1435 $prefix = $pos === false ?
'' : substr( $module, 0, $pos );
1436 $suffix = $pos === false ?
$module : substr( $module, $pos +
1 );
1437 $groups[$prefix][] = $suffix;
1441 foreach ( $groups as $prefix => $suffixes ) {
1442 $p = $prefix === '' ?
'' : $prefix . '.';
1443 $arr[] = $p . implode( ',', $suffixes );
1445 $str = implode( '|', $arr );
1450 * Determine whether debug mode was requested
1451 * Order of priority is 1) request param, 2) cookie, 3) $wg setting
1454 public static function inDebugMode() {
1455 if ( self
::$debugMode === null ) {
1456 global $wgRequest, $wgResourceLoaderDebug;
1457 self
::$debugMode = $wgRequest->getFuzzyBool( 'debug',
1458 $wgRequest->getCookie( 'resourceLoaderDebug', '', $wgResourceLoaderDebug )
1461 return self
::$debugMode;
1465 * Reset static members used for caching.
1467 * Global state and $wgRequest are evil, but we're using it right
1468 * now and sometimes we need to be able to force ResourceLoader to
1469 * re-evaluate the context because it has changed (e.g. in the test suite).
1471 public static function clearCache() {
1472 self
::$debugMode = null;
1476 * Build a load.php URL
1479 * @param string $source Name of the ResourceLoader source
1480 * @param ResourceLoaderContext $context
1481 * @param array $extraQuery
1482 * @return string URL to load.php. May be protocol-relative if $wgLoadScript is, too.
1484 public function createLoaderURL( $source, ResourceLoaderContext
$context,
1485 $extraQuery = array()
1487 $query = self
::createLoaderQuery( $context, $extraQuery );
1488 $script = $this->getLoadScript( $source );
1490 return wfAppendQuery( $script, $query );
1494 * Build a load.php URL
1495 * @deprecated since 1.24 Use createLoaderURL() instead
1496 * @param array $modules Array of module names (strings)
1497 * @param string $lang Language code
1498 * @param string $skin Skin name
1499 * @param string|null $user User name. If null, the &user= parameter is omitted
1500 * @param string|null $version Versioning timestamp
1501 * @param bool $debug Whether the request should be in debug mode
1502 * @param string|null $only &only= parameter
1503 * @param bool $printable Printable mode
1504 * @param bool $handheld Handheld mode
1505 * @param array $extraQuery Extra query parameters to add
1506 * @return string URL to load.php. May be protocol-relative if $wgLoadScript is, too.
1508 public static function makeLoaderURL( $modules, $lang, $skin, $user = null,
1509 $version = null, $debug = false, $only = null, $printable = false,
1510 $handheld = false, $extraQuery = array()
1512 global $wgLoadScript;
1514 $query = self
::makeLoaderQuery( $modules, $lang, $skin, $user, $version, $debug,
1515 $only, $printable, $handheld, $extraQuery
1518 return wfAppendQuery( $wgLoadScript, $query );
1522 * Helper for createLoaderURL()
1525 * @see makeLoaderQuery
1526 * @param ResourceLoaderContext $context
1527 * @param array $extraQuery
1530 public static function createLoaderQuery( ResourceLoaderContext
$context, $extraQuery = array() ) {
1531 return self
::makeLoaderQuery(
1532 $context->getModules(),
1533 $context->getLanguage(),
1534 $context->getSkin(),
1535 $context->getUser(),
1536 $context->getVersion(),
1537 $context->getDebug(),
1538 $context->getOnly(),
1539 $context->getRequest()->getBool( 'printable' ),
1540 $context->getRequest()->getBool( 'handheld' ),
1546 * Build a query array (array representation of query string) for load.php. Helper
1547 * function for makeLoaderURL().
1549 * @param array $modules
1550 * @param string $lang
1551 * @param string $skin
1552 * @param string $user
1553 * @param string $version
1554 * @param bool $debug
1555 * @param string $only
1556 * @param bool $printable
1557 * @param bool $handheld
1558 * @param array $extraQuery
1562 public static function makeLoaderQuery( $modules, $lang, $skin, $user = null,
1563 $version = null, $debug = false, $only = null, $printable = false,
1564 $handheld = false, $extraQuery = array()
1567 'modules' => self
::makePackedModulesString( $modules ),
1570 'debug' => $debug ?
'true' : 'false',
1572 if ( $user !== null ) {
1573 $query['user'] = $user;
1575 if ( $version !== null ) {
1576 $query['version'] = $version;
1578 if ( $only !== null ) {
1579 $query['only'] = $only;
1582 $query['printable'] = 1;
1585 $query['handheld'] = 1;
1587 $query +
= $extraQuery;
1589 // Make queries uniform in order
1595 * Check a module name for validity.
1597 * Module names may not contain pipes (|), commas (,) or exclamation marks (!) and can be
1598 * at most 255 bytes.
1600 * @param string $moduleName Module name to check
1601 * @return bool Whether $moduleName is a valid module name
1603 public static function isValidModuleName( $moduleName ) {
1604 return !preg_match( '/[|,!]/', $moduleName ) && strlen( $moduleName ) <= 255;
1608 * Returns LESS compiler set up for use with MediaWiki
1611 * @since 1.26 added $extraVars parameter
1612 * @param Config $config
1613 * @param array $extraVars Associative array of extra (i.e., other than the
1614 * globally-configured ones) that should be used for compilation.
1615 * @throws MWException
1616 * @return Less_Parser
1618 public static function getLessCompiler( Config
$config, $extraVars = array() ) {
1619 // When called from the installer, it is possible that a required PHP extension
1620 // is missing (at least for now; see bug 47564). If this is the case, throw an
1621 // exception (caught by the installer) to prevent a fatal error later on.
1622 if ( !class_exists( 'Less_Parser' ) ) {
1623 throw new MWException( 'MediaWiki requires the less.php parser' );
1626 $parser = new Less_Parser
;
1627 $parser->ModifyVars( array_merge( self
::getLessVars( $config ), $extraVars ) );
1628 $parser->SetImportDirs( array_fill_keys( $config->get( 'ResourceLoaderLESSImportPaths' ), '' ) );
1629 $parser->SetOption( 'relativeUrls', false );
1630 $parser->SetCacheDir( $config->get( 'CacheDirectory' ) ?
: wfTempDir() );
1636 * Get global LESS variables.
1638 * @param Config $config
1640 * @return array Map of variable names to string CSS values.
1642 public static function getLessVars( Config
$config ) {
1643 if ( !self
::$lessVars ) {
1644 $lessVars = $config->get( 'ResourceLoaderLESSVars' );
1645 Hooks
::run( 'ResourceLoaderGetLessVars', array( &$lessVars ) );
1646 self
::$lessVars = $lessVars;
1648 return self
::$lessVars;