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\RelPath
;
30 use Wikimedia\ScopedCallback
;
33 * Abstraction for ResourceLoader modules, with name registration and maxage functionality.
35 abstract class ResourceLoaderModule
implements LoggerAwareInterface
{
37 const TYPE_SCRIPTS
= 'scripts';
38 const TYPE_STYLES
= 'styles';
39 const TYPE_COMBINED
= 'combined';
42 // Module only has styles (loaded via <style> or <link rel=stylesheet>)
43 const LOAD_STYLES
= 'styles';
44 // Module may have other resources (loaded via mw.loader from a script)
45 const LOAD_GENERAL
= 'general';
47 # sitewide core module like a skin file or jQuery component
48 const ORIGIN_CORE_SITEWIDE
= 1;
50 # per-user module generated by the software
51 const ORIGIN_CORE_INDIVIDUAL
= 2;
53 # sitewide module generated from user-editable files, like MediaWiki:Common.js, or
54 # modules accessible to multiple users, such as those generated by the Gadgets extension.
55 const ORIGIN_USER_SITEWIDE
= 3;
57 # per-user module generated from user-editable files, like User:Me/vector.js
58 const ORIGIN_USER_INDIVIDUAL
= 4;
60 # an access constant; make sure this is kept as the largest number in this group
61 const ORIGIN_ALL
= 10;
63 # script and style modules form a hierarchy of trustworthiness, with core modules like
64 # skins and jQuery as most trustworthy, and user scripts as least trustworthy. We can
65 # limit the types of scripts and styles we allow to load on, say, sensitive special
66 # pages like Special:UserLogin and Special:Preferences
67 protected $origin = self
::ORIGIN_CORE_SITEWIDE
;
69 protected $name = null;
70 protected $targets = [ 'desktop' ];
72 // In-object cache for file dependencies
73 protected $fileDeps = [];
74 // In-object cache for message blob (keyed by language)
75 protected $msgBlobs = [];
76 // In-object cache for version hash
77 protected $versionHash = [];
78 // In-object cache for module content
79 protected $contents = [];
89 protected $deprecated = false;
92 * @var LoggerInterface
97 * Get this module's name. This is set when the module is registered
98 * with ResourceLoader::register()
100 * @return string|null Name (string) or null if no name was set
102 public function getName() {
107 * Set this module's name. This is called by ResourceLoader::register()
108 * when registering the module. Other code should not call this.
110 * @param string $name
112 public function setName( $name ) {
117 * Get this module's origin. This is set when the module is registered
118 * with ResourceLoader::register()
120 * @return int ResourceLoaderModule class constant, the subclass default
121 * if not set manually
123 public function getOrigin() {
124 return $this->origin
;
128 * @param ResourceLoaderContext $context
131 public function getFlip( $context ) {
132 return MediaWikiServices
::getInstance()->getContentLanguage()->getDir() !==
133 $context->getDirection();
137 * Get JS representing deprecation information for the current module if available
139 * @return string JavaScript code
141 public function getDeprecationInformation() {
142 $deprecationInfo = $this->deprecated
;
143 if ( $deprecationInfo ) {
144 $name = $this->getName();
145 $warning = 'This page is using the deprecated ResourceLoader module "' . $name . '".';
146 if ( is_string( $deprecationInfo ) ) {
147 $warning .= "\n" . $deprecationInfo;
149 return Xml
::encodeJsCall(
159 * Get all JS for this module for a given language and skin.
160 * Includes all relevant JS except loader scripts.
162 * @param ResourceLoaderContext $context
163 * @return string JavaScript code
165 public function getScript( ResourceLoaderContext
$context ) {
166 // Stub, override expected
171 * Takes named templates by the module and returns an array mapping.
173 * @return array of templates mapping template alias to content
175 public function getTemplates() {
176 // Stub, override expected.
184 public function getConfig() {
185 if ( $this->config
=== null ) {
186 // Ugh, fall back to default
187 $this->config
= MediaWikiServices
::getInstance()->getMainConfig();
190 return $this->config
;
194 * @param Config $config
197 public function setConfig( Config
$config ) {
198 $this->config
= $config;
203 * @param LoggerInterface $logger
206 public function setLogger( LoggerInterface
$logger ) {
207 $this->logger
= $logger;
212 * @return LoggerInterface
214 protected function getLogger() {
215 if ( !$this->logger
) {
216 $this->logger
= new NullLogger();
218 return $this->logger
;
222 * Get the URL or URLs to load for this module's JS in debug mode.
223 * The default behavior is to return a load.php?only=scripts URL for
224 * the module, but file-based modules will want to override this to
225 * load the files directly.
227 * This function is called only when 1) we're in debug mode, 2) there
228 * is no only= parameter and 3) supportsURLLoading() returns true.
229 * #2 is important to prevent an infinite loop, therefore this function
230 * MUST return either an only= URL or a non-load.php URL.
232 * @param ResourceLoaderContext $context
233 * @return array Array of URLs
235 public function getScriptURLsForDebug( ResourceLoaderContext
$context ) {
236 $resourceLoader = $context->getResourceLoader();
237 $derivative = new DerivativeResourceLoaderContext( $context );
238 $derivative->setModules( [ $this->getName() ] );
239 $derivative->setOnly( 'scripts' );
240 $derivative->setDebug( true );
242 $url = $resourceLoader->createLoaderURL(
251 * Whether this module supports URL loading. If this function returns false,
252 * getScript() will be used even in cases (debug mode, no only param) where
253 * getScriptURLsForDebug() would normally be used instead.
256 public function supportsURLLoading() {
261 * Get all CSS for this module for a given skin.
263 * @param ResourceLoaderContext $context
264 * @return array List of CSS strings or array of CSS strings keyed by media type.
265 * like [ 'screen' => '.foo { width: 0 }' ];
266 * or [ 'screen' => [ '.foo { width: 0 }' ] ];
268 public function getStyles( ResourceLoaderContext
$context ) {
269 // Stub, override expected
274 * Get the URL or URLs to load for this module's CSS in debug mode.
275 * The default behavior is to return a load.php?only=styles URL for
276 * the module, but file-based modules will want to override this to
277 * load the files directly. See also getScriptURLsForDebug()
279 * @param ResourceLoaderContext $context
280 * @return array [ mediaType => [ URL1, URL2, ... ], ... ]
282 public function getStyleURLsForDebug( ResourceLoaderContext
$context ) {
283 $resourceLoader = $context->getResourceLoader();
284 $derivative = new DerivativeResourceLoaderContext( $context );
285 $derivative->setModules( [ $this->getName() ] );
286 $derivative->setOnly( 'styles' );
287 $derivative->setDebug( true );
289 $url = $resourceLoader->createLoaderURL(
294 return [ 'all' => [ $url ] ];
298 * Get the messages needed for this module.
300 * To get a JSON blob with messages, use MessageBlobStore::get()
302 * @return array List of message keys. Keys may occur more than once
304 public function getMessages() {
305 // Stub, override expected
310 * Get the group this module is in.
312 * @return string Group name
314 public function getGroup() {
315 // Stub, override expected
320 * Get the source of this module. Should only be overridden for foreign modules.
322 * @return string Source name, 'local' for local modules
324 public function getSource() {
325 // Stub, override expected
330 * Whether this module's JS expects to work without the client-side ResourceLoader module.
331 * Returning true from this function will prevent mw.loader.state() call from being
332 * appended to the bottom of the script.
336 public function isRaw() {
341 * Get a list of modules this module depends on.
343 * Dependency information is taken into account when loading a module
344 * on the client side.
346 * Note: It is expected that $context will be made non-optional in the near
349 * @param ResourceLoaderContext|null $context
350 * @return array List of module names as strings
352 public function getDependencies( ResourceLoaderContext
$context = null ) {
353 // Stub, override expected
358 * Get target(s) for the module, eg ['desktop'] or ['desktop', 'mobile']
360 * @return array Array of strings
362 public function getTargets() {
363 return $this->targets
;
367 * Get the module's load type.
370 * @return string ResourceLoaderModule LOAD_* constant
372 public function getType() {
373 return self
::LOAD_GENERAL
;
377 * Get the skip function.
379 * Modules that provide fallback functionality can provide a "skip function". This
380 * function, if provided, will be passed along to the module registry on the client.
381 * When this module is loaded (either directly or as a dependency of another module),
382 * then this function is executed first. If the function returns true, the module will
383 * instantly be considered "ready" without requesting the associated module resources.
385 * The value returned here must be valid javascript for execution in a private function.
386 * It must not contain the "function () {" and "}" wrapper though.
388 * @return string|null A JavaScript function body returning a boolean value, or null
390 public function getSkipFunction() {
395 * Get the files this module depends on indirectly for a given skin.
397 * These are only image files referenced by the module's stylesheet.
399 * @param ResourceLoaderContext $context
400 * @return array List of files
402 protected function getFileDependencies( ResourceLoaderContext
$context ) {
403 $vary = $context->getSkin() . '|' . $context->getLanguage();
405 // Try in-object cache first
406 if ( !isset( $this->fileDeps
[$vary] ) ) {
407 $dbr = wfGetDB( DB_REPLICA
);
408 $deps = $dbr->selectField( 'module_deps',
411 'md_module' => $this->getName(),
417 if ( !is_null( $deps ) ) {
418 $this->fileDeps
[$vary] = self
::expandRelativePaths(
419 (array)json_decode( $deps, true )
422 $this->fileDeps
[$vary] = [];
425 return $this->fileDeps
[$vary];
429 * Set in-object cache for file dependencies.
431 * This is used to retrieve data in batches. See ResourceLoader::preloadModuleInfo().
432 * To save the data, use saveFileDependencies().
434 * @param ResourceLoaderContext $context
435 * @param string[] $files Array of file names
437 public function setFileDependencies( ResourceLoaderContext
$context, $files ) {
438 $vary = $context->getSkin() . '|' . $context->getLanguage();
439 $this->fileDeps
[$vary] = $files;
443 * Set the files this module depends on indirectly for a given skin.
446 * @param ResourceLoaderContext $context
447 * @param array $localFileRefs List of files
449 protected function saveFileDependencies( ResourceLoaderContext
$context, $localFileRefs ) {
451 // Related bugs and performance considerations:
452 // 1. Don't needlessly change the database value with the same list in a
453 // different order or with duplicates.
454 // 2. Use relative paths to avoid ghost entries when $IP changes. (T111481)
455 // 3. Don't needlessly replace the database with the same value
456 // just because $IP changed (e.g. when upgrading a wiki).
457 // 4. Don't create an endless replace loop on every request for this
458 // module when '../' is used anywhere. Even though both are expanded
459 // (one expanded by getFileDependencies from the DB, the other is
460 // still raw as originally read by RL), the latter has not
461 // been normalized yet.
464 $localFileRefs = array_values( array_unique( $localFileRefs ) );
465 sort( $localFileRefs );
466 $localPaths = self
::getRelativePaths( $localFileRefs );
468 $storedPaths = self
::getRelativePaths( $this->getFileDependencies( $context ) );
469 // If the list has been modified since last time we cached it, update the cache
470 if ( $localPaths !== $storedPaths ) {
471 $vary = $context->getSkin() . '|' . $context->getLanguage();
472 $cache = ObjectCache
::getLocalClusterInstance();
473 $key = $cache->makeKey( __METHOD__
, $this->getName(), $vary );
474 $scopeLock = $cache->getScopedLock( $key, 0 );
476 return; // T124649; avoid write slams
479 // No needless escaping as this isn't HTML output.
480 // Only stored in the database and parsed in PHP.
481 $deps = json_encode( $localPaths, JSON_UNESCAPED_SLASHES
);
482 $dbw = wfGetDB( DB_MASTER
);
483 $dbw->upsert( 'module_deps',
485 'md_module' => $this->getName(),
489 [ 'md_module', 'md_skin' ],
495 if ( $dbw->trxLevel() ) {
496 $dbw->onTransactionResolution(
497 function () use ( &$scopeLock ) {
498 ScopedCallback
::consume( $scopeLock ); // release after commit
504 } catch ( Exception
$e ) {
505 wfDebugLog( 'resourceloader', __METHOD__
. ": failed to update DB: $e" );
510 * Make file paths relative to MediaWiki directory.
512 * This is used to make file paths safe for storing in a database without the paths
513 * becoming stale or incorrect when MediaWiki is moved or upgraded (T111481).
516 * @param array $filePaths
519 public static function getRelativePaths( array $filePaths ) {
521 return array_map( function ( $path ) use ( $IP ) {
522 return RelPath
::getRelativePath( $path, $IP );
527 * Expand directories relative to $IP.
530 * @param array $filePaths
533 public static function expandRelativePaths( array $filePaths ) {
535 return array_map( function ( $path ) use ( $IP ) {
536 return RelPath
::joinPath( $IP, $path );
541 * Get the hash of the message blob.
544 * @param ResourceLoaderContext $context
545 * @return string|null JSON blob or null if module has no messages
547 protected function getMessageBlob( ResourceLoaderContext
$context ) {
548 if ( !$this->getMessages() ) {
549 // Don't bother consulting MessageBlobStore
552 // Message blobs may only vary language, not by context keys
553 $lang = $context->getLanguage();
554 if ( !isset( $this->msgBlobs
[$lang] ) ) {
555 $this->getLogger()->warning( 'Message blob for {module} should have been preloaded', [
556 'module' => $this->getName(),
558 $store = $context->getResourceLoader()->getMessageBlobStore();
559 $this->msgBlobs
[$lang] = $store->getBlob( $this, $lang );
561 return $this->msgBlobs
[$lang];
565 * Set in-object cache for message blobs.
567 * Used to allow fetching of message blobs in batches. See ResourceLoader::preloadModuleInfo().
570 * @param string|null $blob JSON blob or null
571 * @param string $lang Language code
573 public function setMessageBlob( $blob, $lang ) {
574 $this->msgBlobs
[$lang] = $blob;
578 * Get headers to send as part of a module web response.
580 * It is not supported to send headers through this method that are
581 * required to be unique or otherwise sent once in an HTTP response
582 * because clients may make batch requests for multiple modules (as
583 * is the default behaviour for ResourceLoader clients).
585 * For exclusive or aggregated headers, see ResourceLoader::sendResponseHeaders().
588 * @param ResourceLoaderContext $context
589 * @return string[] Array of HTTP response headers
591 final public function getHeaders( ResourceLoaderContext
$context ) {
594 $formattedLinks = [];
595 foreach ( $this->getPreloadLinks( $context ) as $url => $attribs ) {
596 $link = "<{$url}>;rel=preload";
597 foreach ( $attribs as $key => $val ) {
598 $link .= ";{$key}={$val}";
600 $formattedLinks[] = $link;
602 if ( $formattedLinks ) {
603 $headers[] = 'Link: ' . implode( ',', $formattedLinks );
610 * Get a list of resources that web browsers may preload.
612 * Behaviour of rel=preload link is specified at <https://www.w3.org/TR/preload/>.
614 * Use case for ResourceLoader originally part of T164299.
618 * protected function getPreloadLinks() {
620 * 'https://example.org/script.js' => [ 'as' => 'script' ],
621 * 'https://example.org/image.png' => [ 'as' => 'image' ],
626 * @par Example using HiDPI image variants
628 * protected function getPreloadLinks() {
630 * 'https://example.org/logo.png' => [
632 * 'media' => 'not all and (min-resolution: 2dppx)',
634 * 'https://example.org/logo@2x.png' => [
636 * 'media' => '(min-resolution: 2dppx)',
642 * @see ResourceLoaderModule::getHeaders
644 * @param ResourceLoaderContext $context
645 * @return array Keyed by url, values must be an array containing
646 * at least an 'as' key. Optionally a 'media' key as well.
648 protected function getPreloadLinks( ResourceLoaderContext
$context ) {
653 * Get module-specific LESS variables, if any.
656 * @param ResourceLoaderContext $context
657 * @return array Module-specific LESS variables.
659 protected function getLessVars( ResourceLoaderContext
$context ) {
664 * Get an array of this module's resources. Ready for serving to the web.
667 * @param ResourceLoaderContext $context
670 public function getModuleContent( ResourceLoaderContext
$context ) {
671 $contextHash = $context->getHash();
672 // Cache this expensive operation. This calls builds the scripts, styles, and messages
673 // content which typically involves filesystem and/or database access.
674 if ( !array_key_exists( $contextHash, $this->contents
) ) {
675 $this->contents
[$contextHash] = $this->buildContent( $context );
677 return $this->contents
[$contextHash];
681 * Bundle all resources attached to this module into an array.
684 * @param ResourceLoaderContext $context
687 final protected function buildContent( ResourceLoaderContext
$context ) {
688 $rl = $context->getResourceLoader();
689 $stats = MediaWikiServices
::getInstance()->getStatsdDataFactory();
690 $statStart = microtime( true );
692 // This MUST build both scripts and styles, regardless of whether $context->getOnly()
693 // is 'scripts' or 'styles' because the result is used by getVersionHash which
694 // must be consistent regardles of the 'only' filter on the current request.
695 // Also, when introducing new module content resources (e.g. templates, headers),
696 // these should only be included in the array when they are non-empty so that
697 // existing modules not using them do not get their cache invalidated.
701 // If we are in debug mode, we'll want to return an array of URLs if possible
702 // However, we can't do this if the module doesn't support it.
703 // We also can't do this if there is an only= parameter, because we have to give
704 // the module a way to return a load.php URL without causing an infinite loop
705 if ( $context->getDebug() && !$context->getOnly() && $this->supportsURLLoading() ) {
706 $scripts = $this->getScriptURLsForDebug( $context );
708 $scripts = $this->getScript( $context );
709 // Make the script safe to concatenate by making sure there is at least one
710 // trailing new line at the end of the content. Previously, this looked for
711 // a semi-colon instead, but that breaks concatenation if the semicolon
712 // is inside a comment like "// foo();". Instead, simply use a
713 // line break as separator which matches JavaScript native logic for implicitly
714 // ending statements even if a semi-colon is missing.
715 // Bugs: T29054, T162719.
716 if ( is_string( $scripts )
717 && strlen( $scripts )
718 && substr( $scripts, -1 ) !== "\n"
723 $content['scripts'] = $scripts;
727 // Don't create empty stylesheets like [ '' => '' ] for modules
728 // that don't *have* any stylesheets (T40024).
729 $stylePairs = $this->getStyles( $context );
730 if ( count( $stylePairs ) ) {
731 // If we are in debug mode without &only= set, we'll want to return an array of URLs
732 // See comment near shouldIncludeScripts() for more details
733 if ( $context->getDebug() && !$context->getOnly() && $this->supportsURLLoading() ) {
735 'url' => $this->getStyleURLsForDebug( $context )
738 // Minify CSS before embedding in mw.loader.implement call
739 // (unless in debug mode)
740 if ( !$context->getDebug() ) {
741 foreach ( $stylePairs as $media => $style ) {
742 // Can be either a string or an array of strings.
743 if ( is_array( $style ) ) {
744 $stylePairs[$media] = [];
745 foreach ( $style as $cssText ) {
746 if ( is_string( $cssText ) ) {
747 $stylePairs[$media][] =
748 ResourceLoader
::filter( 'minify-css', $cssText );
751 } elseif ( is_string( $style ) ) {
752 $stylePairs[$media] = ResourceLoader
::filter( 'minify-css', $style );
756 // Wrap styles into @media groups as needed and flatten into a numerical array
758 'css' => $rl->makeCombinedStyles( $stylePairs )
762 $content['styles'] = $styles;
765 $blob = $this->getMessageBlob( $context );
767 $content['messagesBlob'] = $blob;
770 $templates = $this->getTemplates();
772 $content['templates'] = $templates;
775 $headers = $this->getHeaders( $context );
777 $content['headers'] = $headers;
780 $statTiming = microtime( true ) - $statStart;
781 $statName = strtr( $this->getName(), '.', '_' );
782 $stats->timing( "resourceloader_build.all", 1000 * $statTiming );
783 $stats->timing( "resourceloader_build.$statName", 1000 * $statTiming );
789 * Get a string identifying the current version of this module in a given context.
791 * Whenever anything happens that changes the module's response (e.g. scripts, styles, and
792 * messages) this value must change. This value is used to store module responses in cache.
793 * (Both client-side and server-side.)
795 * It is not recommended to override this directly. Use getDefinitionSummary() instead.
796 * If overridden, one must call the parent getVersionHash(), append data and re-hash.
798 * This method should be quick because it is frequently run by ResourceLoaderStartUpModule to
799 * propagate changes to the client and effectively invalidate cache.
802 * @param ResourceLoaderContext $context
803 * @return string Hash (should use ResourceLoader::makeHash)
805 public function getVersionHash( ResourceLoaderContext
$context ) {
806 // Cache this somewhat expensive operation. Especially because some classes
807 // (e.g. startup module) iterate more than once over all modules to get versions.
808 $contextHash = $context->getHash();
809 if ( !array_key_exists( $contextHash, $this->versionHash
) ) {
810 if ( $this->enableModuleContentVersion() ) {
811 // Detect changes directly by hashing the module contents.
812 $str = json_encode( $this->getModuleContent( $context ) );
814 // Infer changes based on definition and other metrics
815 $summary = $this->getDefinitionSummary( $context );
816 if ( !isset( $summary['_class'] ) ) {
817 throw new LogicException( 'getDefinitionSummary must call parent method' );
819 $str = json_encode( $summary );
822 $this->versionHash
[$contextHash] = ResourceLoader
::makeHash( $str );
824 return $this->versionHash
[$contextHash];
828 * Whether to generate version hash based on module content.
830 * If a module requires database or file system access to build the module
831 * content, consider disabling this in favour of manually tracking relevant
832 * aspects in getDefinitionSummary(). See getVersionHash() for how this is used.
836 public function enableModuleContentVersion() {
841 * Get the definition summary for this module.
843 * This is the method subclasses are recommended to use to track values in their
844 * version hash. Call this in getVersionHash() and pass it to e.g. json_encode.
846 * Subclasses must call the parent getDefinitionSummary() and build on that.
847 * It is recommended that each subclass appends its own new array. This prevents
848 * clashes or accidental overwrites of existing keys and gives each subclass
849 * its own scope for simple array keys.
852 * $summary = parent::getDefinitionSummary( $context );
860 * Return an array containing values from all significant properties of this
861 * module's definition.
863 * Be careful not to normalise too much. Especially preserve the order of things
864 * that carry significance in getScript and getStyles (T39812).
866 * Avoid including things that are insiginificant (e.g. order of message keys is
867 * insignificant and should be sorted to avoid unnecessary cache invalidation).
869 * This data structure must exclusively contain arrays and scalars as values (avoid
870 * object instances) to allow simple serialisation using json_encode.
872 * If modules have a hash or timestamp from another source, that may be incuded as-is.
874 * A number of utility methods are available to help you gather data. These are not
875 * called by default and must be included by the subclass' getDefinitionSummary().
880 * @param ResourceLoaderContext $context
883 public function getDefinitionSummary( ResourceLoaderContext
$context ) {
885 '_class' => static::class,
886 // Make sure that when filter cache for minification is invalidated,
887 // we also change the HTTP urls and mw.loader.store keys (T176884).
888 '_cacheVersion' => ResourceLoader
::CACHE_VERSION
,
893 * Check whether this module is known to be empty. If a child class
894 * has an easy and cheap way to determine that this module is
895 * definitely going to be empty, it should override this method to
896 * return true in that case. Callers may optimize the request for this
897 * module away if this function returns true.
898 * @param ResourceLoaderContext $context
901 public function isKnownEmpty( ResourceLoaderContext
$context ) {
906 * Check whether this module should be embeded rather than linked
908 * Modules returning true here will be embedded rather than loaded by
909 * ResourceLoaderClientHtml.
912 * @param ResourceLoaderContext $context
915 public function shouldEmbedModule( ResourceLoaderContext
$context ) {
916 return $this->getGroup() === 'private';
919 /** @var JSParser Lazy-initialized; use self::javaScriptParser() */
920 private static $jsParser;
921 private static $parseCacheVersion = 1;
924 * Validate a given script file; if valid returns the original source.
925 * If invalid, returns replacement JS source that throws an exception.
927 * @param string $fileName
928 * @param string $contents
929 * @return string JS with the original, or a replacement error
931 protected function validateScriptFile( $fileName, $contents ) {
932 if ( !$this->getConfig()->get( 'ResourceLoaderValidateJS' ) ) {
935 $cache = ObjectCache
::getMainWANInstance();
936 return $cache->getWithSetCallback(
937 $cache->makeGlobalKey(
940 self
::$parseCacheVersion,
945 function () use ( $contents, $fileName ) {
946 $parser = self
::javaScriptParser();
948 $parser->parse( $contents, $fileName, 1 );
950 } catch ( Exception
$e ) {
951 // We'll save this to cache to avoid having to re-validate broken JS
952 $err = $e->getMessage();
953 $result = "mw.log.error(" .
954 Xml
::encodeJsVar( "JavaScript parse error: $err" ) . ");";
964 protected static function javaScriptParser() {
965 if ( !self
::$jsParser ) {
966 self
::$jsParser = new JSParser();
968 return self
::$jsParser;
972 * Safe version of filemtime(), which doesn't throw a PHP warning if the file doesn't exist.
975 * @param string $filePath File path
976 * @return int UNIX timestamp
978 protected static function safeFilemtime( $filePath ) {
979 Wikimedia\
suppressWarnings();
980 $mtime = filemtime( $filePath ) ?
: 1;
981 Wikimedia\restoreWarnings
();
986 * Compute a non-cryptographic string hash of a file's contents.
987 * If the file does not exist or cannot be read, returns an empty string.
989 * @since 1.26 Uses MD4 instead of SHA1.
990 * @param string $filePath File path
991 * @return string Hash
993 protected static function safeFileHash( $filePath ) {
994 return FileContentsHasher
::getFileContentsHash( $filePath );