3 * Abstraction for resource loader 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
26 * Abstraction for resource loader modules, with name registration and maxage functionality.
28 abstract class ResourceLoaderModule
{
30 const TYPE_SCRIPTS
= 'scripts';
31 const TYPE_STYLES
= 'styles';
32 const TYPE_COMBINED
= 'combined';
34 # sitewide core module like a skin file or jQuery component
35 const ORIGIN_CORE_SITEWIDE
= 1;
37 # per-user module generated by the software
38 const ORIGIN_CORE_INDIVIDUAL
= 2;
40 # sitewide module generated from user-editable files, like MediaWiki:Common.js, or
41 # modules accessible to multiple users, such as those generated by the Gadgets extension.
42 const ORIGIN_USER_SITEWIDE
= 3;
44 # per-user module generated from user-editable files, like User:Me/vector.js
45 const ORIGIN_USER_INDIVIDUAL
= 4;
47 # an access constant; make sure this is kept as the largest number in this group
48 const ORIGIN_ALL
= 10;
50 # script and style modules form a hierarchy of trustworthiness, with core modules like
51 # skins and jQuery as most trustworthy, and user scripts as least trustworthy. We can
52 # limit the types of scripts and styles we allow to load on, say, sensitive special
53 # pages like Special:UserLogin and Special:Preferences
54 protected $origin = self
::ORIGIN_CORE_SITEWIDE
;
56 /* Protected Members */
58 protected $name = null;
59 protected $targets = array( 'desktop' );
61 // In-object cache for file dependencies
62 protected $fileDeps = array();
63 // In-object cache for message blob mtime
64 protected $msgBlobMtime = array();
65 // In-object cache for version hash
66 protected $versionHash = array();
68 // Whether the position returned by getPosition() is defined in the module configuration
69 // and not a default value
70 protected $isPositionDefined = false;
80 * Get this module's name. This is set when the module is registered
81 * with ResourceLoader::register()
83 * @return string|null Name (string) or null if no name was set
85 public function getName() {
90 * Set this module's name. This is called by ResourceLoader::register()
91 * when registering the module. Other code should not call this.
93 * @param string $name Name
95 public function setName( $name ) {
100 * Get this module's origin. This is set when the module is registered
101 * with ResourceLoader::register()
103 * @return int ResourceLoaderModule class constant, the subclass default
104 * if not set manually
106 public function getOrigin() {
107 return $this->origin
;
111 * Set this module's origin. This is called by ResourceLoader::register()
112 * when registering the module. Other code should not call this.
114 * @param int $origin Origin
116 public function setOrigin( $origin ) {
117 $this->origin
= $origin;
121 * @param ResourceLoaderContext $context
124 public function getFlip( $context ) {
127 return $wgContLang->getDir() !== $context->getDirection();
131 * Get all JS for this module for a given language and skin.
132 * Includes all relevant JS except loader scripts.
134 * @param ResourceLoaderContext $context
135 * @return string JavaScript code
137 public function getScript( ResourceLoaderContext
$context ) {
138 // Stub, override expected
143 * Takes named templates by the module and returns an array mapping.
145 * @return array of templates mapping template alias to content
147 public function getTemplates() {
148 // Stub, override expected.
156 public function getConfig() {
157 if ( $this->config
=== null ) {
158 // Ugh, fall back to default
159 $this->config
= ConfigFactory
::getDefaultInstance()->makeConfig( 'main' );
162 return $this->config
;
166 * @param Config $config
169 public function setConfig( Config
$config ) {
170 $this->config
= $config;
174 * Get the URL or URLs to load for this module's JS in debug mode.
175 * The default behavior is to return a load.php?only=scripts URL for
176 * the module, but file-based modules will want to override this to
177 * load the files directly.
179 * This function is called only when 1) we're in debug mode, 2) there
180 * is no only= parameter and 3) supportsURLLoading() returns true.
181 * #2 is important to prevent an infinite loop, therefore this function
182 * MUST return either an only= URL or a non-load.php URL.
184 * @param ResourceLoaderContext $context
185 * @return array Array of URLs
187 public function getScriptURLsForDebug( ResourceLoaderContext
$context ) {
188 $resourceLoader = $context->getResourceLoader();
189 $derivative = new DerivativeResourceLoaderContext( $context );
190 $derivative->setModules( array( $this->getName() ) );
191 $derivative->setOnly( 'scripts' );
192 $derivative->setDebug( true );
194 $url = $resourceLoader->createLoaderURL(
199 return array( $url );
203 * Whether this module supports URL loading. If this function returns false,
204 * getScript() will be used even in cases (debug mode, no only param) where
205 * getScriptURLsForDebug() would normally be used instead.
208 public function supportsURLLoading() {
213 * Get all CSS for this module for a given skin.
215 * @param ResourceLoaderContext $context
216 * @return array List of CSS strings or array of CSS strings keyed by media type.
217 * like array( 'screen' => '.foo { width: 0 }' );
218 * or array( 'screen' => array( '.foo { width: 0 }' ) );
220 public function getStyles( ResourceLoaderContext
$context ) {
221 // Stub, override expected
226 * Get the URL or URLs to load for this module's CSS in debug mode.
227 * The default behavior is to return a load.php?only=styles URL for
228 * the module, but file-based modules will want to override this to
229 * load the files directly. See also getScriptURLsForDebug()
231 * @param ResourceLoaderContext $context
232 * @return array Array( mediaType => array( URL1, URL2, ... ), ... )
234 public function getStyleURLsForDebug( ResourceLoaderContext
$context ) {
235 $resourceLoader = $context->getResourceLoader();
236 $derivative = new DerivativeResourceLoaderContext( $context );
237 $derivative->setModules( array( $this->getName() ) );
238 $derivative->setOnly( 'styles' );
239 $derivative->setDebug( true );
241 $url = $resourceLoader->createLoaderURL(
246 return array( 'all' => array( $url ) );
250 * Get the messages needed for this module.
252 * To get a JSON blob with messages, use MessageBlobStore::get()
254 * @return array List of message keys. Keys may occur more than once
256 public function getMessages() {
257 // Stub, override expected
262 * Get the group this module is in.
264 * @return string Group name
266 public function getGroup() {
267 // Stub, override expected
272 * Get the origin of this module. Should only be overridden for foreign modules.
274 * @return string Origin name, 'local' for local modules
276 public function getSource() {
277 // Stub, override expected
282 * Where on the HTML page should this module's JS be loaded?
283 * - 'top': in the "<head>"
284 * - 'bottom': at the bottom of the "<body>"
288 public function getPosition() {
293 * Whether the position returned by getPosition() is a default value or comes from the module
294 * definition. This method is meant to be short-lived, and is only useful until classes added via
295 * addModuleStyles with a default value define an explicit position. See getModuleStyles() in
296 * OutputPage for the related migration warning.
301 public function isPositionDefault() {
302 return !$this->isPositionDefined
;
306 * Whether this module's JS expects to work without the client-side ResourceLoader module.
307 * Returning true from this function will prevent mw.loader.state() call from being
308 * appended to the bottom of the script.
312 public function isRaw() {
317 * Get the loader JS for this module, if set.
319 * @return mixed JavaScript loader code as a string or boolean false if no custom loader set
321 public function getLoaderScript() {
322 // Stub, override expected
327 * Get a list of modules this module depends on.
329 * Dependency information is taken into account when loading a module
330 * on the client side.
332 * To add dependencies dynamically on the client side, use a custom
333 * loader script, see getLoaderScript()
334 * @return array List of module names as strings
336 public function getDependencies() {
337 // Stub, override expected
342 * Get target(s) for the module, eg ['desktop'] or ['desktop', 'mobile']
344 * @return array Array of strings
346 public function getTargets() {
347 return $this->targets
;
351 * Get the skip function.
353 * Modules that provide fallback functionality can provide a "skip function". This
354 * function, if provided, will be passed along to the module registry on the client.
355 * When this module is loaded (either directly or as a dependency of another module),
356 * then this function is executed first. If the function returns true, the module will
357 * instantly be considered "ready" without requesting the associated module resources.
359 * The value returned here must be valid javascript for execution in a private function.
360 * It must not contain the "function () {" and "}" wrapper though.
362 * @return string|null A JavaScript function body returning a boolean value, or null
364 public function getSkipFunction() {
369 * Get the files this module depends on indirectly for a given skin.
370 * Currently these are only image files referenced by the module's CSS.
372 * @param string $skin Skin name
373 * @return array List of files
375 public function getFileDependencies( $skin ) {
376 // Try in-object cache first
377 if ( isset( $this->fileDeps
[$skin] ) ) {
378 return $this->fileDeps
[$skin];
381 $dbr = wfGetDB( DB_SLAVE
);
382 $deps = $dbr->selectField( 'module_deps', 'md_deps', array(
383 'md_module' => $this->getName(),
387 if ( !is_null( $deps ) ) {
388 $this->fileDeps
[$skin] = (array)FormatJson
::decode( $deps, true );
390 $this->fileDeps
[$skin] = array();
392 return $this->fileDeps
[$skin];
396 * Set preloaded file dependency information. Used so we can load this
397 * information for all modules at once.
398 * @param string $skin Skin name
399 * @param array $deps Array of file names
401 public function setFileDependencies( $skin, $deps ) {
402 $this->fileDeps
[$skin] = $deps;
406 * Get the last modification timestamp of the messages in this module for a given language.
407 * @param string $lang Language code
408 * @return int UNIX timestamp
410 public function getMsgBlobMtime( $lang ) {
411 if ( !isset( $this->msgBlobMtime
[$lang] ) ) {
412 if ( !count( $this->getMessages() ) ) {
416 $dbr = wfGetDB( DB_SLAVE
);
417 $msgBlobMtime = $dbr->selectField( 'msg_resource', 'mr_timestamp', array(
418 'mr_resource' => $this->getName(),
422 // If no blob was found, but the module does have messages, that means we need
423 // to regenerate it. Return NOW
424 if ( $msgBlobMtime === false ) {
425 $msgBlobMtime = wfTimestampNow();
427 $this->msgBlobMtime
[$lang] = wfTimestamp( TS_UNIX
, $msgBlobMtime );
429 return $this->msgBlobMtime
[$lang];
433 * Set a preloaded message blob last modification timestamp. Used so we
434 * can load this information for all modules at once.
435 * @param string $lang Language code
436 * @param int $mtime UNIX timestamp
438 public function setMsgBlobMtime( $lang, $mtime ) {
439 $this->msgBlobMtime
[$lang] = $mtime;
443 * Get a string identifying the current version of this module in a given context.
445 * Whenever anything happens that changes the module's response (e.g. scripts, styles, and
446 * messages) this value must change. This value is used to store module responses in cache.
447 * (Both client-side and server-side.)
449 * It is not recommended to override this directly. Use getDefinitionSummary() instead.
450 * If overridden, one must call the parent getVersionHash(), append data and re-hash.
452 * This method should be quick because it is frequently run by ResourceLoaderStartUpModule to
453 * propagate changes to the client and effectively invalidate cache.
455 * For backward-compatibility, the following optional data providers are automatically included:
457 * - getModifiedTime()
458 * - getModifiedHash()
461 * @param ResourceLoaderContext $context
462 * @return string Hash (should use ResourceLoader::makeHash)
464 public function getVersionHash( ResourceLoaderContext
$context ) {
465 // Cache this somewhat expensive operation. Especially because some classes
466 // (e.g. startup module) iterate more than once over all modules to get versions.
467 $contextHash = $context->getHash();
468 if ( !array_key_exists( $contextHash, $this->versionHash
) ) {
470 $summary = $this->getDefinitionSummary( $context );
471 if ( !isset( $summary['_cacheEpoch'] ) ) {
472 throw new Exception( 'getDefinitionSummary must call parent method' );
474 $str = json_encode( $summary );
476 $mtime = $this->getModifiedTime( $context );
477 if ( $mtime !== null ) {
478 // Support: MediaWiki 1.25 and earlier
479 $str .= strval( $mtime );
482 $mhash = $this->getModifiedHash( $context );
483 if ( $mhash !== null ) {
484 // Support: MediaWiki 1.25 and earlier
485 $str .= strval( $mhash );
488 $this->versionHash
[ $contextHash ] = ResourceLoader
::makeHash( $str );
490 return $this->versionHash
[ $contextHash ];
494 * Get the definition summary for this module.
496 * This is the method subclasses are recommended to use to track values in their
497 * version hash. Call this in getVersionHash() and pass it to e.g. json_encode.
499 * Subclasses must call the parent getDefinitionSummary() and build on that.
500 * It is recommended that each subclass appends its own new array. This prevents
501 * clashes or accidental overwrites of existing keys and gives each subclass
502 * its own scope for simple array keys.
505 * $summary = parent::getDefinitionSummary( $context );
506 * $summary[] = array(
513 * Return an array containing values from all significant properties of this
514 * module's definition.
516 * Be careful not to normalise too much. Especially preserve the order of things
517 * that carry significance in getScript and getStyles (T39812).
519 * Avoid including things that are insiginificant (e.g. order of message keys is
520 * insignificant and should be sorted to avoid unnecessary cache invalidation).
522 * This data structure must exclusively contain arrays and scalars as values (avoid
523 * object instances) to allow simple serialisation using json_encode.
525 * If modules have a hash or timestamp from another source, that may be incuded as-is.
527 * A number of utility methods are available to help you gather data. These are not
528 * called by default and must be included by the subclass' getDefinitionSummary().
530 * - getMsgBlobMtime()
533 * @param ResourceLoaderContext $context
536 public function getDefinitionSummary( ResourceLoaderContext
$context ) {
538 '_class' => get_class( $this ),
539 '_cacheEpoch' => $this->getConfig()->get( 'CacheEpoch' ),
544 * Get this module's last modification timestamp for a given context.
546 * @deprecated since 1.26 Use getDefinitionSummary() instead
547 * @param ResourceLoaderContext $context Context object
548 * @return int|null UNIX timestamp
550 public function getModifiedTime( ResourceLoaderContext
$context ) {
555 * Helper method for providing a version hash to getVersionHash().
557 * @deprecated since 1.26 Use getDefinitionSummary() instead
558 * @param ResourceLoaderContext $context
559 * @return string|null Hash
561 public function getModifiedHash( ResourceLoaderContext
$context ) {
566 * Back-compat dummy for old subclass implementations of getModifiedTime().
568 * This method used to use ObjectCache to track when a hash was first seen. That principle
569 * stems from a time that ResourceLoader could only identify module versions by timestamp.
570 * That is no longer the case. Use getDefinitionSummary() directly.
572 * @deprecated since 1.26 Superseded by getVersionHash()
573 * @param ResourceLoaderContext $context
574 * @return int UNIX timestamp
576 public function getHashMtime( ResourceLoaderContext
$context ) {
577 if ( !is_string( $this->getModifiedHash( $context ) ) ) {
585 * Back-compat dummy for old subclass implementations of getModifiedTime().
588 * @deprecated since 1.26 Superseded by getVersionHash()
589 * @param ResourceLoaderContext $context
590 * @return int UNIX timestamp
592 public function getDefinitionMtime( ResourceLoaderContext
$context ) {
593 if ( $this->getDefinitionSummary( $context ) === null ) {
601 * Check whether this module is known to be empty. If a child class
602 * has an easy and cheap way to determine that this module is
603 * definitely going to be empty, it should override this method to
604 * return true in that case. Callers may optimize the request for this
605 * module away if this function returns true.
606 * @param ResourceLoaderContext $context
609 public function isKnownEmpty( ResourceLoaderContext
$context ) {
613 /** @var JSParser Lazy-initialized; use self::javaScriptParser() */
614 private static $jsParser;
615 private static $parseCacheVersion = 1;
618 * Validate a given script file; if valid returns the original source.
619 * If invalid, returns replacement JS source that throws an exception.
621 * @param string $fileName
622 * @param string $contents
623 * @return string JS with the original, or a replacement error
625 protected function validateScriptFile( $fileName, $contents ) {
626 if ( $this->getConfig()->get( 'ResourceLoaderValidateJS' ) ) {
628 // Use CACHE_ANYTHING since filtering is very slow compared to DB queries
629 $key = wfMemcKey( 'resourceloader', 'jsparse', self
::$parseCacheVersion, md5( $contents ) );
630 $cache = wfGetCache( CACHE_ANYTHING
);
631 $cacheEntry = $cache->get( $key );
632 if ( is_string( $cacheEntry ) ) {
636 $parser = self
::javaScriptParser();
638 $parser->parse( $contents, $fileName, 1 );
640 } catch ( Exception
$e ) {
641 // We'll save this to cache to avoid having to validate broken JS over and over...
642 $err = $e->getMessage();
643 $result = "throw new Error(" . Xml
::encodeJsVar( "JavaScript parse error: $err" ) . ");";
646 $cache->set( $key, $result );
656 protected static function javaScriptParser() {
657 if ( !self
::$jsParser ) {
658 self
::$jsParser = new JSParser();
660 return self
::$jsParser;
664 * Safe version of filemtime(), which doesn't throw a PHP warning if the file doesn't exist
665 * but returns 1 instead.
666 * @param string $filename File name
667 * @return int UNIX timestamp
669 protected static function safeFilemtime( $filename ) {
670 wfSuppressWarnings();
671 $mtime = filemtime( $filename ) ?
: 1;