3 * Abstraction for ResourceLoader modules.
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 Trevor Parscal
22 * @author Roan Kattouw
25 use MediaWiki\MediaWikiServices
;
26 use Psr\Log\LoggerAwareInterface
;
27 use Psr\Log\LoggerInterface
;
28 use Psr\Log\NullLogger
;
29 use Wikimedia\AtEase\AtEase
;
30 use Wikimedia\RelPath
;
31 use Wikimedia\ScopedCallback
;
34 * Abstraction for ResourceLoader modules, with name registration and maxage functionality.
36 abstract class ResourceLoaderModule
implements LoggerAwareInterface
{
39 /** @var LoggerInterface */
43 * Script and style modules form a hierarchy of trustworthiness, with core modules
44 * like skins and jQuery as most trustworthy, and user scripts as least trustworthy. We can
45 * limit the types of scripts and styles we allow to load on, say, sensitive special
46 * pages like Special:UserLogin and Special:Preferences
49 protected $origin = self
::ORIGIN_CORE_SITEWIDE
;
51 /** @var string|null Module name */
52 protected $name = null;
53 /** @var string[] What client platforms the module targets (e.g. desktop, mobile) */
54 protected $targets = [ 'desktop' ];
56 /** @var array Map of (variant => indirect file dependencies) */
57 protected $fileDeps = [];
58 /** @var array Map of (language => in-object cache for message blob) */
59 protected $msgBlobs = [];
60 /** @var array Map of (context hash => cached module version hash) */
61 protected $versionHash = [];
62 /** @var array Map of (context hash => cached module content) */
63 protected $contents = [];
65 /** @var string|bool Deprecation string or true if deprecated; false otherwise */
66 protected $deprecated = false;
68 /** @var string Scripts only */
69 const TYPE_SCRIPTS
= 'scripts';
70 /** @var string Styles only */
71 const TYPE_STYLES
= 'styles';
72 /** @var string Scripts and styles */
73 const TYPE_COMBINED
= 'combined';
75 /** @var string Module only has styles (loaded via <style> or <link rel=stylesheet>) */
76 const LOAD_STYLES
= 'styles';
77 /** @var string Module may have other resources (loaded via mw.loader from a script) */
78 const LOAD_GENERAL
= 'general';
80 /** @var int Sitewide core module like a skin file or jQuery component */
81 const ORIGIN_CORE_SITEWIDE
= 1;
82 /** @var int Per-user module generated by the software */
83 const ORIGIN_CORE_INDIVIDUAL
= 2;
85 * Sitewide module generated from user-editable files, like MediaWiki:Common.js,
86 * or modules accessible to multiple users, such as those generated by the Gadgets extension.
89 const ORIGIN_USER_SITEWIDE
= 3;
90 /** @var int Per-user module generated from user-editable files, like User:Me/vector.js */
91 const ORIGIN_USER_INDIVIDUAL
= 4;
92 /** @var int An access constant; make sure this is kept as the largest number in this group */
93 const ORIGIN_ALL
= 10;
96 * Get this module's name. This is set when the module is registered
97 * with ResourceLoader::register()
99 * @return string|null Name (string) or null if no name was set
101 public function getName() {
106 * Set this module's name. This is called by ResourceLoader::register()
107 * when registering the module. Other code should not call this.
109 * @param string $name
111 public function setName( $name ) {
116 * Get this module's origin. This is set when the module is registered
117 * with ResourceLoader::register()
119 * @return int ResourceLoaderModule class constant, the subclass default
120 * if not set manually
122 public function getOrigin() {
123 return $this->origin
;
127 * @param ResourceLoaderContext $context
130 public function getFlip( $context ) {
131 return MediaWikiServices
::getInstance()->getContentLanguage()->getDir() !==
132 $context->getDirection();
136 * Get JS representing deprecation information for the current module if available
138 * @param ResourceLoaderContext|null $context Missing $context is deprecated in 1.34
139 * @return string JavaScript code
141 public function getDeprecationInformation( ResourceLoaderContext
$context = null ) {
142 if ( $context === null ) {
143 wfDeprecated( __METHOD__
. ' without a ResourceLoader context', '1.34' );
145 $deprecationInfo = $this->deprecated
;
146 if ( $deprecationInfo ) {
147 $name = $this->getName();
148 $warning = 'This page is using the deprecated ResourceLoader module "' . $name . '".';
149 if ( is_string( $deprecationInfo ) ) {
150 $warning .= "\n" . $deprecationInfo;
152 if ( $context === null ) {
153 return 'mw.log.warn(' . ResourceLoader
::encodeJsonForScript( $warning ) . ');';
155 return 'mw.log.warn(' . $context->encodeJson( $warning ) . ');';
162 * Get all JS for this module for a given language and skin.
163 * Includes all relevant JS except loader scripts.
165 * For "plain" script modules, this should return a string with JS code. For multi-file modules
166 * where require() is used to load one file from another file, this should return an array
167 * structured as follows:
170 * 'file1.js' => [ 'type' => 'script', 'content' => 'JS code' ],
171 * 'file2.js' => [ 'type' => 'script', 'content' => 'JS code' ],
172 * 'data.json' => [ 'type' => 'data', 'content' => array ]
174 * 'main' => 'file1.js'
177 * @param ResourceLoaderContext $context
178 * @return string|array JavaScript code (string), or multi-file structure described above (array)
180 public function getScript( ResourceLoaderContext
$context ) {
181 // Stub, override expected
186 * Takes named templates by the module and returns an array mapping.
188 * @return string[] Array of templates mapping template alias to content
190 public function getTemplates() {
191 // Stub, override expected.
199 public function getConfig() {
200 if ( $this->config
=== null ) {
201 // Ugh, fall back to default
202 $this->config
= MediaWikiServices
::getInstance()->getMainConfig();
205 return $this->config
;
209 * @param Config $config
212 public function setConfig( Config
$config ) {
213 $this->config
= $config;
218 * @param LoggerInterface $logger
220 public function setLogger( LoggerInterface
$logger ) {
221 $this->logger
= $logger;
226 * @return LoggerInterface
228 protected function getLogger() {
229 if ( !$this->logger
) {
230 $this->logger
= new NullLogger();
232 return $this->logger
;
236 * Get the URL or URLs to load for this module's JS in debug mode.
237 * The default behavior is to return a load.php?only=scripts URL for
238 * the module, but file-based modules will want to override this to
239 * load the files directly.
241 * This function is called only when 1) we're in debug mode, 2) there
242 * is no only= parameter and 3) supportsURLLoading() returns true.
243 * #2 is important to prevent an infinite loop, therefore this function
244 * MUST return either an only= URL or a non-load.php URL.
246 * @param ResourceLoaderContext $context
247 * @return array Array of URLs
249 public function getScriptURLsForDebug( ResourceLoaderContext
$context ) {
250 $resourceLoader = $context->getResourceLoader();
251 $derivative = new DerivativeResourceLoaderContext( $context );
252 $derivative->setModules( [ $this->getName() ] );
253 $derivative->setOnly( 'scripts' );
254 $derivative->setDebug( true );
256 $url = $resourceLoader->createLoaderURL(
265 * Whether this module supports URL loading. If this function returns false,
266 * getScript() will be used even in cases (debug mode, no only param) where
267 * getScriptURLsForDebug() would normally be used instead.
270 public function supportsURLLoading() {
275 * Get all CSS for this module for a given skin.
277 * @param ResourceLoaderContext $context
278 * @return array List of CSS strings or array of CSS strings keyed by media type.
279 * like [ 'screen' => '.foo { width: 0 }' ];
280 * or [ 'screen' => [ '.foo { width: 0 }' ] ];
282 public function getStyles( ResourceLoaderContext
$context ) {
283 // Stub, override expected
288 * Get the URL or URLs to load for this module's CSS in debug mode.
289 * The default behavior is to return a load.php?only=styles URL for
290 * the module, but file-based modules will want to override this to
291 * load the files directly. See also getScriptURLsForDebug()
293 * @param ResourceLoaderContext $context
294 * @return array [ mediaType => [ URL1, URL2, ... ], ... ]
296 public function getStyleURLsForDebug( ResourceLoaderContext
$context ) {
297 $resourceLoader = $context->getResourceLoader();
298 $derivative = new DerivativeResourceLoaderContext( $context );
299 $derivative->setModules( [ $this->getName() ] );
300 $derivative->setOnly( 'styles' );
301 $derivative->setDebug( true );
303 $url = $resourceLoader->createLoaderURL(
308 return [ 'all' => [ $url ] ];
312 * Get the messages needed for this module.
314 * To get a JSON blob with messages, use MessageBlobStore::get()
316 * @return array List of message keys. Keys may occur more than once
318 public function getMessages() {
319 // Stub, override expected
324 * Get the group this module is in.
326 * @return string Group name
328 public function getGroup() {
329 // Stub, override expected
334 * Get the source of this module. Should only be overridden for foreign modules.
336 * @return string Source name, 'local' for local modules
338 public function getSource() {
339 // Stub, override expected
344 * Get a list of modules this module depends on.
346 * Dependency information is taken into account when loading a module
347 * on the client side.
349 * Note: It is expected that $context will be made non-optional in the near
352 * @param ResourceLoaderContext|null $context
353 * @return array List of module names as strings
355 public function getDependencies( ResourceLoaderContext
$context = null ) {
356 // Stub, override expected
361 * Get target(s) for the module, eg ['desktop'] or ['desktop', 'mobile']
363 * @return array Array of strings
365 public function getTargets() {
366 return $this->targets
;
370 * Get the module's load type.
373 * @return string ResourceLoaderModule LOAD_* constant
375 public function getType() {
376 return self
::LOAD_GENERAL
;
380 * Get the skip function.
382 * Modules that provide fallback functionality can provide a "skip function". This
383 * function, if provided, will be passed along to the module registry on the client.
384 * When this module is loaded (either directly or as a dependency of another module),
385 * then this function is executed first. If the function returns true, the module will
386 * instantly be considered "ready" without requesting the associated module resources.
388 * The value returned here must be valid javascript for execution in a private function.
389 * It must not contain the "function () {" and "}" wrapper though.
391 * @return string|null A JavaScript function body returning a boolean value, or null
393 public function getSkipFunction() {
398 * Get the files this module depends on indirectly for a given skin.
400 * These are only image files referenced by the module's stylesheet.
402 * @param ResourceLoaderContext $context
403 * @return array List of files
405 protected function getFileDependencies( ResourceLoaderContext
$context ) {
406 $vary = self
::getVary( $context );
408 // Try in-object cache first
409 if ( !isset( $this->fileDeps
[$vary] ) ) {
410 $dbr = wfGetDB( DB_REPLICA
);
411 $deps = $dbr->selectField( 'module_deps',
414 'md_module' => $this->getName(),
420 if ( !is_null( $deps ) ) {
421 $this->fileDeps
[$vary] = self
::expandRelativePaths(
422 (array)json_decode( $deps, true )
425 $this->fileDeps
[$vary] = [];
428 return $this->fileDeps
[$vary];
432 * Set in-object cache for file dependencies.
434 * This is used to retrieve data in batches. See ResourceLoader::preloadModuleInfo().
435 * To save the data, use saveFileDependencies().
437 * @param ResourceLoaderContext $context
438 * @param string[] $files Array of file names
440 public function setFileDependencies( ResourceLoaderContext
$context, $files ) {
441 $vary = self
::getVary( $context );
442 $this->fileDeps
[$vary] = $files;
446 * Set the files this module depends on indirectly for a given skin.
449 * @param ResourceLoaderContext $context
450 * @param array $localFileRefs List of files
452 protected function saveFileDependencies( ResourceLoaderContext
$context, $localFileRefs ) {
454 // Related bugs and performance considerations:
455 // 1. Don't needlessly change the database value with the same list in a
456 // different order or with duplicates.
457 // 2. Use relative paths to avoid ghost entries when $IP changes. (T111481)
458 // 3. Don't needlessly replace the database with the same value
459 // just because $IP changed (e.g. when upgrading a wiki).
460 // 4. Don't create an endless replace loop on every request for this
461 // module when '../' is used anywhere. Even though both are expanded
462 // (one expanded by getFileDependencies from the DB, the other is
463 // still raw as originally read by RL), the latter has not
464 // been normalized yet.
467 $localFileRefs = array_values( array_unique( $localFileRefs ) );
468 sort( $localFileRefs );
469 $localPaths = self
::getRelativePaths( $localFileRefs );
470 $storedPaths = self
::getRelativePaths( $this->getFileDependencies( $context ) );
472 if ( $localPaths === $storedPaths ) {
473 // Unchanged. Avoid needless database query (especially master conn!).
477 // The file deps list has changed, we want to update it.
478 $vary = self
::getVary( $context );
479 $cache = ObjectCache
::getLocalClusterInstance();
480 $key = $cache->makeKey( __METHOD__
, $this->getName(), $vary );
481 $scopeLock = $cache->getScopedLock( $key, 0 );
483 // Another request appears to be doing this update already.
484 // Avoid write slams (T124649).
488 // No needless escaping as this isn't HTML output.
489 // Only stored in the database and parsed in PHP.
490 $deps = json_encode( $localPaths, JSON_UNESCAPED_SLASHES
);
491 $dbw = wfGetDB( DB_MASTER
);
492 $dbw->upsert( 'module_deps',
494 'md_module' => $this->getName(),
498 [ [ 'md_module', 'md_skin' ] ],
505 if ( $dbw->trxLevel() ) {
506 $dbw->onTransactionResolution(
507 function () use ( &$scopeLock ) {
508 ScopedCallback
::consume( $scopeLock ); // release after commit
513 } catch ( Exception
$e ) {
514 // Probably a DB failure. Either the read query from getFileDependencies(),
515 // or the write query above.
516 wfDebugLog( 'resourceloader', __METHOD__
. ": failed to update DB: $e" );
521 * Make file paths relative to MediaWiki directory.
523 * This is used to make file paths safe for storing in a database without the paths
524 * becoming stale or incorrect when MediaWiki is moved or upgraded (T111481).
527 * @param array $filePaths
530 public static function getRelativePaths( array $filePaths ) {
532 return array_map( function ( $path ) use ( $IP ) {
533 return RelPath
::getRelativePath( $path, $IP );
538 * Expand directories relative to $IP.
541 * @param array $filePaths
544 public static function expandRelativePaths( array $filePaths ) {
546 return array_map( function ( $path ) use ( $IP ) {
547 return RelPath
::joinPath( $IP, $path );
552 * Get the hash of the message blob.
555 * @param ResourceLoaderContext $context
556 * @return string|null JSON blob or null if module has no messages
558 protected function getMessageBlob( ResourceLoaderContext
$context ) {
559 if ( !$this->getMessages() ) {
560 // Don't bother consulting MessageBlobStore
563 // Message blobs may only vary language, not by context keys
564 $lang = $context->getLanguage();
565 if ( !isset( $this->msgBlobs
[$lang] ) ) {
566 $this->getLogger()->warning( 'Message blob for {module} should have been preloaded', [
567 'module' => $this->getName(),
569 $store = $context->getResourceLoader()->getMessageBlobStore();
570 $this->msgBlobs
[$lang] = $store->getBlob( $this, $lang );
572 return $this->msgBlobs
[$lang];
576 * Set in-object cache for message blobs.
578 * Used to allow fetching of message blobs in batches. See ResourceLoader::preloadModuleInfo().
581 * @param string|null $blob JSON blob or null
582 * @param string $lang Language code
584 public function setMessageBlob( $blob, $lang ) {
585 $this->msgBlobs
[$lang] = $blob;
589 * Get headers to send as part of a module web response.
591 * It is not supported to send headers through this method that are
592 * required to be unique or otherwise sent once in an HTTP response
593 * because clients may make batch requests for multiple modules (as
594 * is the default behaviour for ResourceLoader clients).
596 * For exclusive or aggregated headers, see ResourceLoader::sendResponseHeaders().
599 * @param ResourceLoaderContext $context
600 * @return string[] Array of HTTP response headers
602 final public function getHeaders( ResourceLoaderContext
$context ) {
605 $formattedLinks = [];
606 foreach ( $this->getPreloadLinks( $context ) as $url => $attribs ) {
607 $link = "<{$url}>;rel=preload";
608 foreach ( $attribs as $key => $val ) {
609 $link .= ";{$key}={$val}";
611 $formattedLinks[] = $link;
613 if ( $formattedLinks ) {
614 $headers[] = 'Link: ' . implode( ',', $formattedLinks );
621 * Get a list of resources that web browsers may preload.
623 * Behaviour of rel=preload link is specified at <https://www.w3.org/TR/preload/>.
625 * Use case for ResourceLoader originally part of T164299.
629 * protected function getPreloadLinks() {
631 * 'https://example.org/script.js' => [ 'as' => 'script' ],
632 * 'https://example.org/image.png' => [ 'as' => 'image' ],
637 * @par Example using HiDPI image variants
639 * protected function getPreloadLinks() {
641 * 'https://example.org/logo.png' => [
643 * 'media' => 'not all and (min-resolution: 2dppx)',
645 * 'https://example.org/logo@2x.png' => [
647 * 'media' => '(min-resolution: 2dppx)',
653 * @see ResourceLoaderModule::getHeaders
655 * @param ResourceLoaderContext $context
656 * @return array Keyed by url, values must be an array containing
657 * at least an 'as' key. Optionally a 'media' key as well.
659 protected function getPreloadLinks( ResourceLoaderContext
$context ) {
664 * Get module-specific LESS variables, if any.
667 * @param ResourceLoaderContext $context
668 * @return array Module-specific LESS variables.
670 protected function getLessVars( ResourceLoaderContext
$context ) {
675 * Get an array of this module's resources. Ready for serving to the web.
678 * @param ResourceLoaderContext $context
681 public function getModuleContent( ResourceLoaderContext
$context ) {
682 $contextHash = $context->getHash();
683 // Cache this expensive operation. This calls builds the scripts, styles, and messages
684 // content which typically involves filesystem and/or database access.
685 if ( !array_key_exists( $contextHash, $this->contents
) ) {
686 $this->contents
[$contextHash] = $this->buildContent( $context );
688 return $this->contents
[$contextHash];
692 * Bundle all resources attached to this module into an array.
695 * @param ResourceLoaderContext $context
698 final protected function buildContent( ResourceLoaderContext
$context ) {
699 $rl = $context->getResourceLoader();
700 $stats = MediaWikiServices
::getInstance()->getStatsdDataFactory();
701 $statStart = microtime( true );
703 // This MUST build both scripts and styles, regardless of whether $context->getOnly()
704 // is 'scripts' or 'styles' because the result is used by getVersionHash which
705 // must be consistent regardless of the 'only' filter on the current request.
706 // Also, when introducing new module content resources (e.g. templates, headers),
707 // these should only be included in the array when they are non-empty so that
708 // existing modules not using them do not get their cache invalidated.
712 // If we are in debug mode, we'll want to return an array of URLs if possible
713 // However, we can't do this if the module doesn't support it.
714 // We also can't do this if there is an only= parameter, because we have to give
715 // the module a way to return a load.php URL without causing an infinite loop
716 if ( $context->getDebug() && !$context->getOnly() && $this->supportsURLLoading() ) {
717 $scripts = $this->getScriptURLsForDebug( $context );
719 $scripts = $this->getScript( $context );
720 // Make the script safe to concatenate by making sure there is at least one
721 // trailing new line at the end of the content. Previously, this looked for
722 // a semi-colon instead, but that breaks concatenation if the semicolon
723 // is inside a comment like "// foo();". Instead, simply use a
724 // line break as separator which matches JavaScript native logic for implicitly
725 // ending statements even if a semi-colon is missing.
726 // Bugs: T29054, T162719.
727 if ( is_string( $scripts )
728 && strlen( $scripts )
729 && substr( $scripts, -1 ) !== "\n"
734 $content['scripts'] = $scripts;
737 // Don't create empty stylesheets like [ '' => '' ] for modules
738 // that don't *have* any stylesheets (T40024).
739 $stylePairs = $this->getStyles( $context );
740 if ( count( $stylePairs ) ) {
741 // If we are in debug mode without &only= set, we'll want to return an array of URLs
742 // See comment near shouldIncludeScripts() for more details
743 if ( $context->getDebug() && !$context->getOnly() && $this->supportsURLLoading() ) {
745 'url' => $this->getStyleURLsForDebug( $context )
748 // Minify CSS before embedding in mw.loader.implement call
749 // (unless in debug mode)
750 if ( !$context->getDebug() ) {
751 foreach ( $stylePairs as $media => $style ) {
752 // Can be either a string or an array of strings.
753 if ( is_array( $style ) ) {
754 $stylePairs[$media] = [];
755 foreach ( $style as $cssText ) {
756 if ( is_string( $cssText ) ) {
757 $stylePairs[$media][] =
758 ResourceLoader
::filter( 'minify-css', $cssText );
761 } elseif ( is_string( $style ) ) {
762 $stylePairs[$media] = ResourceLoader
::filter( 'minify-css', $style );
766 // Wrap styles into @media groups as needed and flatten into a numerical array
768 'css' => $rl->makeCombinedStyles( $stylePairs )
772 $content['styles'] = $styles;
775 $blob = $this->getMessageBlob( $context );
777 $content['messagesBlob'] = $blob;
780 $templates = $this->getTemplates();
782 $content['templates'] = $templates;
785 $headers = $this->getHeaders( $context );
787 $content['headers'] = $headers;
790 $statTiming = microtime( true ) - $statStart;
791 $statName = strtr( $this->getName(), '.', '_' );
792 $stats->timing( "resourceloader_build.all", 1000 * $statTiming );
793 $stats->timing( "resourceloader_build.$statName", 1000 * $statTiming );
799 * Get a string identifying the current version of this module in a given context.
801 * Whenever anything happens that changes the module's response (e.g. scripts, styles, and
802 * messages) this value must change. This value is used to store module responses in cache.
803 * (Both client-side and server-side.)
805 * It is not recommended to override this directly. Use getDefinitionSummary() instead.
806 * If overridden, one must call the parent getVersionHash(), append data and re-hash.
808 * This method should be quick because it is frequently run by ResourceLoaderStartUpModule to
809 * propagate changes to the client and effectively invalidate cache.
812 * @param ResourceLoaderContext $context
813 * @return string Hash (should use ResourceLoader::makeHash)
815 public function getVersionHash( ResourceLoaderContext
$context ) {
816 // Cache this somewhat expensive operation. Especially because some classes
817 // (e.g. startup module) iterate more than once over all modules to get versions.
818 $contextHash = $context->getHash();
819 if ( !array_key_exists( $contextHash, $this->versionHash
) ) {
820 if ( $this->enableModuleContentVersion() ) {
821 // Detect changes directly by hashing the module contents.
822 $str = json_encode( $this->getModuleContent( $context ) );
824 // Infer changes based on definition and other metrics
825 $summary = $this->getDefinitionSummary( $context );
826 if ( !isset( $summary['_class'] ) ) {
827 throw new LogicException( 'getDefinitionSummary must call parent method' );
829 $str = json_encode( $summary );
832 $this->versionHash
[$contextHash] = ResourceLoader
::makeHash( $str );
834 return $this->versionHash
[$contextHash];
838 * Whether to generate version hash based on module content.
840 * If a module requires database or file system access to build the module
841 * content, consider disabling this in favour of manually tracking relevant
842 * aspects in getDefinitionSummary(). See getVersionHash() for how this is used.
846 public function enableModuleContentVersion() {
851 * Get the definition summary for this module.
853 * This is the method subclasses are recommended to use to track values in their
854 * version hash. Call this in getVersionHash() and pass it to e.g. json_encode.
856 * Subclasses must call the parent getDefinitionSummary() and build on that.
857 * It is recommended that each subclass appends its own new array. This prevents
858 * clashes or accidental overwrites of existing keys and gives each subclass
859 * its own scope for simple array keys.
862 * $summary = parent::getDefinitionSummary( $context );
870 * Return an array containing values from all significant properties of this
871 * module's definition.
873 * Be careful not to normalise too much. Especially preserve the order of things
874 * that carry significance in getScript and getStyles (T39812).
876 * Avoid including things that are insiginificant (e.g. order of message keys is
877 * insignificant and should be sorted to avoid unnecessary cache invalidation).
879 * This data structure must exclusively contain arrays and scalars as values (avoid
880 * object instances) to allow simple serialisation using json_encode.
882 * If modules have a hash or timestamp from another source, that may be incuded as-is.
884 * A number of utility methods are available to help you gather data. These are not
885 * called by default and must be included by the subclass' getDefinitionSummary().
890 * @param ResourceLoaderContext $context
893 public function getDefinitionSummary( ResourceLoaderContext
$context ) {
895 '_class' => static::class,
896 // Make sure that when filter cache for minification is invalidated,
897 // we also change the HTTP urls and mw.loader.store keys (T176884).
898 '_cacheVersion' => ResourceLoader
::CACHE_VERSION
,
903 * Check whether this module is known to be empty. If a child class
904 * has an easy and cheap way to determine that this module is
905 * definitely going to be empty, it should override this method to
906 * return true in that case. Callers may optimize the request for this
907 * module away if this function returns true.
908 * @param ResourceLoaderContext $context
911 public function isKnownEmpty( ResourceLoaderContext
$context ) {
916 * Check whether this module should be embeded rather than linked
918 * Modules returning true here will be embedded rather than loaded by
919 * ResourceLoaderClientHtml.
922 * @param ResourceLoaderContext $context
925 public function shouldEmbedModule( ResourceLoaderContext
$context ) {
926 return $this->getGroup() === 'private';
929 /** @var JSParser Lazy-initialized; use self::javaScriptParser() */
930 private static $jsParser;
931 private static $parseCacheVersion = 1;
934 * Validate a given script file; if valid returns the original source.
935 * If invalid, returns replacement JS source that throws an exception.
937 * @param string $fileName
938 * @param string $contents
939 * @return string JS with the original, or a replacement error
941 protected function validateScriptFile( $fileName, $contents ) {
942 if ( !$this->getConfig()->get( 'ResourceLoaderValidateJS' ) ) {
945 $cache = MediaWikiServices
::getInstance()->getMainWANObjectCache();
946 return $cache->getWithSetCallback(
947 $cache->makeGlobalKey(
948 'resourceloader-jsparse',
949 self
::$parseCacheVersion,
954 function () use ( $contents, $fileName ) {
955 $parser = self
::javaScriptParser();
958 AtEase
::suppressWarnings();
959 $parser->parse( $contents, $fileName, 1 );
960 } catch ( Exception
$e ) {
963 AtEase
::restoreWarnings();
966 // Send the error to the browser console client-side.
967 // By returning this as replacement for the actual script,
968 // we ensure modules are safe to load in a batch request,
969 // without causing other unrelated modules to break.
970 return 'mw.log.error(' .
971 Xml
::encodeJsVar( 'JavaScript parse error: ' . $err->getMessage() ) .
982 protected static function javaScriptParser() {
983 if ( !self
::$jsParser ) {
984 self
::$jsParser = new JSParser();
986 return self
::$jsParser;
990 * Safe version of filemtime(), which doesn't throw a PHP warning if the file doesn't exist.
993 * @param string $filePath File path
994 * @return int UNIX timestamp
996 protected static function safeFilemtime( $filePath ) {
997 AtEase
::suppressWarnings();
998 $mtime = filemtime( $filePath ) ?
: 1;
999 AtEase
::restoreWarnings();
1004 * Compute a non-cryptographic string hash of a file's contents.
1005 * If the file does not exist or cannot be read, returns an empty string.
1007 * @since 1.26 Uses MD4 instead of SHA1.
1008 * @param string $filePath File path
1009 * @return string Hash
1011 protected static function safeFileHash( $filePath ) {
1012 return FileContentsHasher
::getFileContentsHash( $filePath );
1018 * @internal For internal use only.
1019 * @param ResourceLoaderContext $context
1020 * @return string Vary string
1022 public static function getVary( ResourceLoaderContext
$context ) {
1023 return implode( '|', [
1024 $context->getSkin(),
1025 $context->getLanguage(),