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<?php
/**
* Base class for resource loading system.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @author Roan Kattouw
* @author Trevor Parscal
*/
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use WrappedString\WrappedString;
/**
* Dynamic JavaScript and CSS resource loading system.
*
* Most of the documentation is on the MediaWiki documentation wiki starting at:
* https://www.mediawiki.org/wiki/ResourceLoader
*/
class ResourceLoader implements LoggerAwareInterface {
/** @var int */
protected static $filterCacheVersion = 7;
/** @var bool */
protected static $debugMode = null;
/** @var array */
private $lessVars = null;
/**
* Module name/ResourceLoaderModule object pairs
* @var array
*/
protected $modules = [];
/**
* Associative array mapping module name to info associative array
* @var array
*/
protected $moduleInfos = [];
/** @var Config $config */
private $config;
/**
* Associative array mapping framework ids to a list of names of test suite modules
* like array( 'qunit' => array( 'mediawiki.tests.qunit.suites', 'ext.foo.tests', .. ), .. )
* @var array
*/
protected $testModuleNames = [];
/**
* E.g. array( 'source-id' => 'http://.../load.php' )
* @var array
*/
protected $sources = [];
/**
* Errors accumulated during current respond() call.
* @var array
*/
protected $errors = [];
/**
* @var MessageBlobStore
*/
protected $blobStore;
/**
* @var LoggerInterface
*/
private $logger;
/** @var string JavaScript / CSS pragma to disable minification. **/
const FILTER_NOMIN = '/*@nomin*/';
/**
* Load information stored in the database about modules.
*
* This method grabs modules dependencies from the database and updates modules
* objects.
*
* This is not inside the module code because it is much faster to
* request all of the information at once than it is to have each module
* requests its own information. This sacrifice of modularity yields a substantial
* performance improvement.
*
* @param array $moduleNames List of module names to preload information for
* @param ResourceLoaderContext $context Context to load the information within
*/
public function preloadModuleInfo( array $moduleNames, ResourceLoaderContext $context ) {
if ( !$moduleNames ) {
// Or else Database*::select() will explode, plus it's cheaper!
return;
}
$dbr = wfGetDB( DB_SLAVE );
$skin = $context->getSkin();
$lang = $context->getLanguage();
// Batched version of ResourceLoaderModule::getFileDependencies
$vary = "$skin|$lang";
$res = $dbr->select( 'module_deps', [ 'md_module', 'md_deps' ], [
'md_module' => $moduleNames,
'md_skin' => $vary,
], __METHOD__
);
// Prime in-object cache for file dependencies
$modulesWithDeps = [];
foreach ( $res as $row ) {
$module = $this->getModule( $row->md_module );
if ( $module ) {
$module->setFileDependencies( $context, ResourceLoaderModule::expandRelativePaths(
FormatJson::decode( $row->md_deps, true )
) );
$modulesWithDeps[] = $row->md_module;
}
}
// Register the absence of a dependency row too
foreach ( array_diff( $moduleNames, $modulesWithDeps ) as $name ) {
$module = $this->getModule( $name );
if ( $module ) {
$this->getModule( $name )->setFileDependencies( $context, [] );
}
}
// Prime in-object cache for message blobs for modules with messages
$modules = [];
foreach ( $moduleNames as $name ) {
$module = $this->getModule( $name );
if ( $module && $module->getMessages() ) {
$modules[$name] = $module;
}
}
$store = $this->getMessageBlobStore();
$blobs = $store->getBlobs( $modules, $lang );
foreach ( $blobs as $name => $blob ) {
$modules[$name]->setMessageBlob( $blob, $lang );
}
}
/**
* Run JavaScript or CSS data through a filter, caching the filtered result for future calls.
*
* Available filters are:
*
* - minify-js \see JavaScriptMinifier::minify
* - minify-css \see CSSMin::minify
*
* If $data is empty, only contains whitespace or the filter was unknown,
* $data is returned unmodified.
*
* @param string $filter Name of filter to run
* @param string $data Text to filter, such as JavaScript or CSS text
* @param array $options Keys:
* - (bool) cache: Whether to allow caching this data. Default: true.
* @return string Filtered data, or a comment containing an error message
*/
public static function filter( $filter, $data, array $options = [] ) {
if ( strpos( $data, ResourceLoader::FILTER_NOMIN ) !== false ) {
return $data;
}
if ( isset( $options['cache'] ) && $options['cache'] === false ) {
return self::applyFilter( $filter, $data );
}
$stats = RequestContext::getMain()->getStats();
$cache = ObjectCache::getLocalServerInstance( CACHE_ANYTHING );
$key = $cache->makeGlobalKey(
'resourceloader',
'filter',
$filter,
self::$filterCacheVersion, md5( $data )
);
$result = $cache->get( $key );
if ( $result === false ) {
$stats->increment( "resourceloader_cache.$filter.miss" );
$result = self::applyFilter( $filter, $data );
$cache->set( $key, $result, 24 * 3600 );
} else {
$stats->increment( "resourceloader_cache.$filter.hit" );
}
if ( $result === null ) {
// Cached failure
$result = $data;
}
return $result;
}
private static function applyFilter( $filter, $data ) {
$data = trim( $data );
if ( $data ) {
try {
$data = ( $filter === 'minify-css' )
? CSSMin::minify( $data )
: JavaScriptMinifier::minify( $data );
} catch ( Exception $e ) {
MWExceptionHandler::logException( $e );
return null;
}
}
return $data;
}
/* Methods */
/**
* Register core modules and runs registration hooks.
* @param Config $config [optional]
* @param LoggerInterface $logger [optional]
*/
public function __construct( Config $config = null, LoggerInterface $logger = null ) {
global $IP;
$this->logger = $logger ?: new NullLogger();
if ( !$config ) {
$this->logger->debug( __METHOD__ . ' was called without providing a Config instance' );
$config = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
}
$this->config = $config;
// Add 'local' source first
$this->addSource( 'local', wfScript( 'load' ) );
// Add other sources
$this->addSource( $config->get( 'ResourceLoaderSources' ) );
// Register core modules
$this->register( include "$IP/resources/Resources.php" );
$this->register( include "$IP/resources/ResourcesOOUI.php" );
// Register extension modules
$this->register( $config->get( 'ResourceModules' ) );
Hooks::run( 'ResourceLoaderRegisterModules', [ &$this ] );
if ( $config->get( 'EnableJavaScriptTest' ) === true ) {
$this->registerTestModules();
}
$this->setMessageBlobStore( new MessageBlobStore( $this, $this->logger ) );
}
/**
* @return Config
*/
public function getConfig() {
return $this->config;
}
/**
* @since 1.26
* @param LoggerInterface $logger
*/
public function setLogger( LoggerInterface $logger ) {
$this->logger = $logger;
}
/**
* @since 1.27
* @return LoggerInterface
*/
public function getLogger() {
return $this->logger;
}
/**
* @since 1.26
* @return MessageBlobStore
*/
public function getMessageBlobStore() {
return $this->blobStore;
}
/**
* @since 1.25
* @param MessageBlobStore $blobStore
*/
public function setMessageBlobStore( MessageBlobStore $blobStore ) {
$this->blobStore = $blobStore;
}
/**
* Register a module with the ResourceLoader system.
*
* @param mixed $name Name of module as a string or List of name/object pairs as an array
* @param array $info Module info array. For backwards compatibility with 1.17alpha,
* this may also be a ResourceLoaderModule object. Optional when using
* multiple-registration calling style.
* @throws MWException If a duplicate module registration is attempted
* @throws MWException If a module name contains illegal characters (pipes or commas)
* @throws MWException If something other than a ResourceLoaderModule is being registered
* @return bool False if there were any errors, in which case one or more modules were
* not registered
*/
public function register( $name, $info = null ) {
// Allow multiple modules to be registered in one call
$registrations = is_array( $name ) ? $name : [ $name => $info ];
foreach ( $registrations as $name => $info ) {
// Warn on duplicate registrations
if ( isset( $this->moduleInfos[$name] ) ) {
// A module has already been registered by this name
$this->logger->warning(
'ResourceLoader duplicate registration warning. ' .
'Another module has already been registered as ' . $name
);
}
// Check $name for validity
if ( !self::isValidModuleName( $name ) ) {
throw new MWException( "ResourceLoader module name '$name' is invalid, "
. "see ResourceLoader::isValidModuleName()" );
}
// Attach module
if ( $info instanceof ResourceLoaderModule ) {
$this->moduleInfos[$name] = [ 'object' => $info ];
$info->setName( $name );
$this->modules[$name] = $info;
} elseif ( is_array( $info ) ) {
// New calling convention
$this->moduleInfos[$name] = $info;
} else {
throw new MWException(
'ResourceLoader module info type error for module \'' . $name .
'\': expected ResourceLoaderModule or array (got: ' . gettype( $info ) . ')'
);
}
// Last-minute changes
// Apply custom skin-defined styles to existing modules.
if ( $this->isFileModule( $name ) ) {
foreach ( $this->config->get( 'ResourceModuleSkinStyles' ) as $skinName => $skinStyles ) {
// If this module already defines skinStyles for this skin, ignore $wgResourceModuleSkinStyles.
if ( isset( $this->moduleInfos[$name]['skinStyles'][$skinName] ) ) {
continue;
}
// If $name is preceded with a '+', the defined style files will be added to 'default'
// skinStyles, otherwise 'default' will be ignored as it normally would be.
if ( isset( $skinStyles[$name] ) ) {
$paths = (array)$skinStyles[$name];
$styleFiles = [];
} elseif ( isset( $skinStyles['+' . $name] ) ) {
$paths = (array)$skinStyles['+' . $name];
$styleFiles = isset( $this->moduleInfos[$name]['skinStyles']['default'] ) ?
(array)$this->moduleInfos[$name]['skinStyles']['default'] :
[];
} else {
continue;
}
// Add new file paths, remapping them to refer to our directories and not use settings
// from the module we're modifying, which come from the base definition.
list( $localBasePath, $remoteBasePath ) =
ResourceLoaderFileModule::extractBasePaths( $skinStyles );
foreach ( $paths as $path ) {
$styleFiles[] = new ResourceLoaderFilePath( $path, $localBasePath, $remoteBasePath );
}
$this->moduleInfos[$name]['skinStyles'][$skinName] = $styleFiles;
}
}
}
}
/**
*/
public function registerTestModules() {
global $IP;
if ( $this->config->get( 'EnableJavaScriptTest' ) !== true ) {
throw new MWException( 'Attempt to register JavaScript test modules '
. 'but <code>$wgEnableJavaScriptTest</code> is false. '
. 'Edit your <code>LocalSettings.php</code> to enable it.' );
}
// Get core test suites
$testModules = [];
$testModules['qunit'] = [];
// Get other test suites (e.g. from extensions)
Hooks::run( 'ResourceLoaderTestModules', [ &$testModules, &$this ] );
// Add the testrunner (which configures QUnit) to the dependencies.
// Since it must be ready before any of the test suites are executed.
foreach ( $testModules['qunit'] as &$module ) {
// Make sure all test modules are top-loading so that when QUnit starts
// on document-ready, it will run once and finish. If some tests arrive
// later (possibly after QUnit has already finished) they will be ignored.
$module['position'] = 'top';
$module['dependencies'][] = 'test.mediawiki.qunit.testrunner';
}
$testModules['qunit'] =
( include "$IP/tests/qunit/QUnitTestResources.php" ) + $testModules['qunit'];
foreach ( $testModules as $id => $names ) {
// Register test modules
$this->register( $testModules[$id] );
// Keep track of their names so that they can be loaded together
$this->testModuleNames[$id] = array_keys( $testModules[$id] );
}
}
/**
* Add a foreign source of modules.
*
* Source IDs are typically the same as the Wiki ID or database name (e.g. lowercase a-z).
*
* @param array|string $id Source ID (string), or array( id1 => loadUrl, id2 => loadUrl, ... )
* @param string|array $loadUrl load.php url (string), or array with loadUrl key for
* backwards-compatibility.
* @throws MWException
*/
public function addSource( $id, $loadUrl = null ) {
// Allow multiple sources to be registered in one call
if ( is_array( $id ) ) {
foreach ( $id as $key => $value ) {
$this->addSource( $key, $value );
}
return;
}
// Disallow duplicates
if ( isset( $this->sources[$id] ) ) {
throw new MWException(
'ResourceLoader duplicate source addition error. ' .
'Another source has already been registered as ' . $id
);
}
// Pre 1.24 backwards-compatibility
if ( is_array( $loadUrl ) ) {
if ( !isset( $loadUrl['loadScript'] ) ) {
throw new MWException(
__METHOD__ . ' was passed an array with no "loadScript" key.'
);
}
$loadUrl = $loadUrl['loadScript'];
}
$this->sources[$id] = $loadUrl;
}
/**
* Get a list of module names.
*
* @return array List of module names
*/
public function getModuleNames() {
return array_keys( $this->moduleInfos );
}
/**
* Get a list of test module names for one (or all) frameworks.
*
* If the given framework id is unknkown, or if the in-object variable is not an array,
* then it will return an empty array.
*
* @param string $framework Get only the test module names for one
* particular framework (optional)
* @return array
*/
public function getTestModuleNames( $framework = 'all' ) {
/** @todo api siteinfo prop testmodulenames modulenames */
if ( $framework == 'all' ) {
return $this->testModuleNames;
} elseif ( isset( $this->testModuleNames[$framework] )
&& is_array( $this->testModuleNames[$framework] )
) {
return $this->testModuleNames[$framework];
} else {
return [];
}
}
/**
* Check whether a ResourceLoader module is registered
*
* @since 1.25
* @param string $name
* @return bool
*/
public function isModuleRegistered( $name ) {
return isset( $this->moduleInfos[$name] );
}
/**
* Get the ResourceLoaderModule object for a given module name.
*
* If an array of module parameters exists but a ResourceLoaderModule object has not
* yet been instantiated, this method will instantiate and cache that object such that
* subsequent calls simply return the same object.
*
* @param string $name Module name
* @return ResourceLoaderModule|null If module has been registered, return a
* ResourceLoaderModule instance. Otherwise, return null.
*/
public function getModule( $name ) {
if ( !isset( $this->modules[$name] ) ) {
if ( !isset( $this->moduleInfos[$name] ) ) {
// No such module
return null;
}
// Construct the requested object
$info = $this->moduleInfos[$name];
/** @var ResourceLoaderModule $object */
if ( isset( $info['object'] ) ) {
// Object given in info array
$object = $info['object'];
} else {
if ( !isset( $info['class'] ) ) {
$class = 'ResourceLoaderFileModule';
} else {
$class = $info['class'];
}
/** @var ResourceLoaderModule $object */
$object = new $class( $info );
$object->setConfig( $this->getConfig() );
$object->setLogger( $this->logger );
}
$object->setName( $name );
$this->modules[$name] = $object;
}
return $this->modules[$name];
}
/**
* Return whether the definition of a module corresponds to a simple ResourceLoaderFileModule.
*
* @param string $name Module name
* @return bool
*/
protected function isFileModule( $name ) {
if ( !isset( $this->moduleInfos[$name] ) ) {
return false;
}
$info = $this->moduleInfos[$name];
if ( isset( $info['object'] ) || isset( $info['class'] ) ) {
return false;
}
return true;
}
/**
* Get the list of sources.
*
* @return array Like array( id => load.php url, .. )
*/
public function getSources() {
return $this->sources;
}
/**
* Get the URL to the load.php endpoint for the given
* ResourceLoader source
*
* @since 1.24
* @param string $source
* @throws MWException On an invalid $source name
* @return string
*/
public function getLoadScript( $source ) {
if ( !isset( $this->sources[$source] ) ) {
throw new MWException( "The $source source was never registered in ResourceLoader." );
}
return $this->sources[$source];
}
/**
* @since 1.26
* @param string $value
* @return string Hash
*/
public static function makeHash( $value ) {
// Use base64 to output more entropy in a more compact string (default hex is only base16).
// The first 8 chars of a base64 encoded digest represent the same binary as
// the first 12 chars of a hex encoded digest.
return substr( base64_encode( sha1( $value, true ) ), 0, 8 );
}
/**
* Helper method to get and combine versions of multiple modules.
*
* @since 1.26
* @param ResourceLoaderContext $context
* @param array $modules List of ResourceLoaderModule objects
* @return string Hash
*/
public function getCombinedVersion( ResourceLoaderContext $context, array $modules ) {
if ( !$modules ) {
return '';
}
$hashes = array_map( function ( $module ) use ( $context ) {
return $this->getModule( $module )->getVersionHash( $context );
}, $modules );
return self::makeHash( implode( $hashes ) );
}
/**
* Output a response to a load request, including the content-type header.
*
* @param ResourceLoaderContext $context Context in which a response should be formed
*/
public function respond( ResourceLoaderContext $context ) {
// Buffer output to catch warnings. Normally we'd use ob_clean() on the
// top-level output buffer to clear warnings, but that breaks when ob_gzhandler
// is used: ob_clean() will clear the GZIP header in that case and it won't come
// back for subsequent output, resulting in invalid GZIP. So we have to wrap
// the whole thing in our own output buffer to be sure the active buffer
// doesn't use ob_gzhandler.
// See http://bugs.php.net/bug.php?id=36514
ob_start();
// Find out which modules are missing and instantiate the others
$modules = [];
$missing = [];
foreach ( $context->getModules() as $name ) {
$module = $this->getModule( $name );
if ( $module ) {
// Do not allow private modules to be loaded from the web.
// This is a security issue, see bug 34907.
if ( $module->getGroup() === 'private' ) {
$this->logger->debug( "Request for private module '$name' denied" );
$this->errors[] = "Cannot show private module \"$name\"";
continue;
}
$modules[$name] = $module;
} else {
$missing[] = $name;
}
}
try {
// Preload for getCombinedVersion() and for batch makeModuleResponse()
$this->preloadModuleInfo( array_keys( $modules ), $context );
} catch ( Exception $e ) {
MWExceptionHandler::logException( $e );
$this->logger->warning( 'Preloading module info failed: {exception}', [
'exception' => $e
] );
$this->errors[] = self::formatExceptionNoComment( $e );
}
// Combine versions to propagate cache invalidation
$versionHash = '';
try {
$versionHash = $this->getCombinedVersion( $context, array_keys( $modules ) );
} catch ( Exception $e ) {
MWExceptionHandler::logException( $e );
$this->logger->warning( 'Calculating version hash failed: {exception}', [
'exception' => $e
] );
$this->errors[] = self::formatExceptionNoComment( $e );
}
// See RFC 2616 § 3.11 Entity Tags
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.11
$etag = 'W/"' . $versionHash . '"';
// Try the client-side cache first
if ( $this->tryRespondNotModified( $context, $etag ) ) {
return; // output handled (buffers cleared)
}
// Use file cache if enabled and available...
if ( $this->config->get( 'UseFileCache' ) ) {
$fileCache = ResourceFileCache::newFromContext( $context );
if ( $this->tryRespondFromFileCache( $fileCache, $context, $etag ) ) {
return; // output handled
}
}
// Generate a response
$response = $this->makeModuleResponse( $context, $modules, $missing );
// Capture any PHP warnings from the output buffer and append them to the
// error list if we're in debug mode.
if ( $context->getDebug() ) {
$warnings = ob_get_contents();
if ( strlen( $warnings ) ) {
$this->errors[] = $warnings;
}
}
// Save response to file cache unless there are errors
if ( isset( $fileCache ) && !$this->errors && !count( $missing ) ) {
// Cache single modules and images...and other requests if there are enough hits
if ( ResourceFileCache::useFileCache( $context ) ) {
if ( $fileCache->isCacheWorthy() ) {
$fileCache->saveText( $response );
} else {
$fileCache->incrMissesRecent( $context->getRequest() );
}
}
}
$this->sendResponseHeaders( $context, $etag, (bool)$this->errors );
// Remove the output buffer and output the response
ob_end_clean();
if ( $context->getImageObj() && $this->errors ) {
// We can't show both the error messages and the response when it's an image.
$response = implode( "\n\n", $this->errors );
} elseif ( $this->errors ) {
$errorText = implode( "\n\n", $this->errors );
$errorResponse = self::makeComment( $errorText );
if ( $context->shouldIncludeScripts() ) {
$errorResponse .= 'if (window.console && console.error) {'
. Xml::encodeJsCall( 'console.error', [ $errorText ] )
. "}\n";
}
// Prepend error info to the response
$response = $errorResponse . $response;
}
$this->errors = [];
echo $response;
}
/**
* Send main response headers to the client.
*
* Deals with Content-Type, CORS (for stylesheets), and caching.
*
* @param ResourceLoaderContext $context
* @param string $etag ETag header value
* @param bool $errors Whether there are errors in the response
* @return void
*/
protected function sendResponseHeaders( ResourceLoaderContext $context, $etag, $errors ) {
$rlMaxage = $this->config->get( 'ResourceLoaderMaxage' );
// If a version wasn't specified we need a shorter expiry time for updates
// to propagate to clients quickly
// If there were errors, we also need a shorter expiry time so we can recover quickly
if ( is_null( $context->getVersion() ) || $errors ) {
$maxage = $rlMaxage['unversioned']['client'];
$smaxage = $rlMaxage['unversioned']['server'];
// If a version was specified we can use a longer expiry time since changing
// version numbers causes cache misses
} else {
$maxage = $rlMaxage['versioned']['client'];
$smaxage = $rlMaxage['versioned']['server'];
}
if ( $context->getImageObj() ) {
// Output different headers if we're outputting textual errors.
if ( $errors ) {
header( 'Content-Type: text/plain; charset=utf-8' );
} else {
$context->getImageObj()->sendResponseHeaders( $context );
}
} elseif ( $context->getOnly() === 'styles' ) {
header( 'Content-Type: text/css; charset=utf-8' );
header( 'Access-Control-Allow-Origin: *' );
} else {
header( 'Content-Type: text/javascript; charset=utf-8' );
}
// See RFC 2616 § 14.19 ETag
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19
header( 'ETag: ' . $etag );
if ( $context->getDebug() ) {
// Do not cache debug responses
header( 'Cache-Control: private, no-cache, must-revalidate' );
header( 'Pragma: no-cache' );
} else {
header( "Cache-Control: public, max-age=$maxage, s-maxage=$smaxage" );
$exp = min( $maxage, $smaxage );
header( 'Expires: ' . wfTimestamp( TS_RFC2822, $exp + time() ) );
}
}
/**
* Respond with HTTP 304 Not Modified if appropiate.
*
* If there's an If-None-Match header, respond with a 304 appropriately
* and clear out the output buffer. If the client cache is too old then do nothing.
*
* @param ResourceLoaderContext $context
* @param string $etag ETag header value
* @return bool True if HTTP 304 was sent and output handled
*/
protected function tryRespondNotModified( ResourceLoaderContext $context, $etag ) {
// See RFC 2616 § 14.26 If-None-Match
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26
$clientKeys = $context->getRequest()->getHeader( 'If-None-Match', WebRequest::GETHEADER_LIST );
// Never send 304s in debug mode
if ( $clientKeys !== false && !$context->getDebug() && in_array( $etag, $clientKeys ) ) {
// There's another bug in ob_gzhandler (see also the comment at
// the top of this function) that causes it to gzip even empty
// responses, meaning it's impossible to produce a truly empty
// response (because the gzip header is always there). This is
// a problem because 304 responses have to be completely empty
// per the HTTP spec, and Firefox behaves buggily when they're not.
// See also http://bugs.php.net/bug.php?id=51579
// To work around this, we tear down all output buffering before
// sending the 304.
wfResetOutputBuffers( /* $resetGzipEncoding = */ true );
HttpStatus::header( 304 );
$this->sendResponseHeaders( $context, $etag, false );
return true;
}
return false;
}
/**
* Send out code for a response from file cache if possible.
*
* @param ResourceFileCache $fileCache Cache object for this request URL
* @param ResourceLoaderContext $context Context in which to generate a response
* @param string $etag ETag header value
* @return bool If this found a cache file and handled the response
*/
protected function tryRespondFromFileCache(
ResourceFileCache $fileCache,
ResourceLoaderContext $context,
$etag
) {
$rlMaxage = $this->config->get( 'ResourceLoaderMaxage' );
// Buffer output to catch warnings.
ob_start();
// Get the maximum age the cache can be
$maxage = is_null( $context->getVersion() )
? $rlMaxage['unversioned']['server']
: $rlMaxage['versioned']['server'];
// Minimum timestamp the cache file must have
$good = $fileCache->isCacheGood( wfTimestamp( TS_MW, time() - $maxage ) );
if ( !$good ) {
try { // RL always hits the DB on file cache miss...
wfGetDB( DB_SLAVE );
} catch ( DBConnectionError $e ) { // ...check if we need to fallback to cache
$good = $fileCache->isCacheGood(); // cache existence check
}
}
if ( $good ) {
$ts = $fileCache->cacheTimestamp();
// Send content type and cache headers
$this->sendResponseHeaders( $context, $etag, false );
$response = $fileCache->fetchText();
// Capture any PHP warnings from the output buffer and append them to the
// response in a comment if we're in debug mode.
if ( $context->getDebug() ) {
$warnings = ob_get_contents();
if ( strlen( $warnings ) ) {
$response = self::makeComment( $warnings ) . $response;
}
}
// Remove the output buffer and output the response
ob_end_clean();
echo $response . "\n/* Cached {$ts} */";
return true; // cache hit
}
// Clear buffer
ob_end_clean();
return false; // cache miss
}
/**
* Generate a CSS or JS comment block.
*
* Only use this for public data, not error message details.
*
* @param string $text
* @return string
*/
public static function makeComment( $text ) {
$encText = str_replace( '*/', '* /', $text );
return "/*\n$encText\n*/\n";
}
/**
* Handle exception display.
*
* @param Exception $e Exception to be shown to the user
* @return string Sanitized text in a CSS/JS comment that can be returned to the user
*/
public static function formatException( $e ) {
return self::makeComment( self::formatExceptionNoComment( $e ) );
}
/**
* Handle exception display.
*
* @since 1.25
* @param Exception $e Exception to be shown to the user
* @return string Sanitized text that can be returned to the user
*/
protected static function formatExceptionNoComment( $e ) {
global $wgShowExceptionDetails;
if ( !$wgShowExceptionDetails ) {
return MWExceptionHandler::getPublicLogMessage( $e );
}
return MWExceptionHandler::getLogMessage( $e );
}
/**
* Generate code for a response.
*
* @param ResourceLoaderContext $context Context in which to generate a response
* @param ResourceLoaderModule[] $modules List of module objects keyed by module name
* @param string[] $missing List of requested module names that are unregistered (optional)
* @return string Response data
*/
public function makeModuleResponse( ResourceLoaderContext $context,
array $modules, array $missing = []
) {
$out = '';
$states = [];
if ( !count( $modules ) && !count( $missing ) ) {
return <<<MESSAGE
/* This file is the Web entry point for MediaWiki's ResourceLoader:
<https://www.mediawiki.org/wiki/ResourceLoader>. In this request,
no modules were requested. Max made me put this here. */
MESSAGE;
}
$image = $context->getImageObj();
if ( $image ) {
$data = $image->getImageData( $context );
if ( $data === false ) {
$data = '';
$this->errors[] = 'Image generation failed';
}
return $data;
}
foreach ( $missing as $name ) {
$states[$name] = 'missing';
}
// Generate output
$isRaw = false;
$filter = $context->getOnly() === 'styles' ? 'minify-css' : 'minify-js';
foreach ( $modules as $name => $module ) {
try {
$content = $module->getModuleContent( $context );
$strContent = '';
// Append output
switch ( $context->getOnly() ) {
case 'scripts':
$scripts = $content['scripts'];
if ( is_string( $scripts ) ) {
// Load scripts raw...
$strContent = $scripts;
} elseif ( is_array( $scripts ) ) {
// ...except when $scripts is an array of URLs
$strContent = self::makeLoaderImplementScript( $name, $scripts, [], [], [] );
}
break;
case 'styles':
$styles = $content['styles'];
// We no longer seperate into media, they are all combined now with
// custom media type groups into @media .. {} sections as part of the css string.
// Module returns either an empty array or a numerical array with css strings.
$strContent = isset( $styles['css'] ) ? implode( '', $styles['css'] ) : '';
break;
default:
$strContent = self::makeLoaderImplementScript(
$name,
isset( $content['scripts'] ) ? $content['scripts'] : '',
isset( $content['styles'] ) ? $content['styles'] : [],
isset( $content['messagesBlob'] ) ? new XmlJsCode( $content['messagesBlob'] ) : [],
isset( $content['templates'] ) ? $content['templates'] : []
);
break;
}
if ( !$context->getDebug() ) {
$strContent = self::filter( $filter, $strContent );
}
$out .= $strContent;
} catch ( Exception $e ) {
MWExceptionHandler::logException( $e );
$this->logger->warning( 'Generating module package failed: {exception}', [
'exception' => $e
] );
$this->errors[] = self::formatExceptionNoComment( $e );
// Respond to client with error-state instead of module implementation
$states[$name] = 'error';
unset( $modules[$name] );
}
$isRaw |= $module->isRaw();
}
// Update module states
if ( $context->shouldIncludeScripts() && !$context->getRaw() && !$isRaw ) {
if ( count( $modules ) && $context->getOnly() === 'scripts' ) {
// Set the state of modules loaded as only scripts to ready as
// they don't have an mw.loader.implement wrapper that sets the state
foreach ( $modules as $name => $module ) {
$states[$name] = 'ready';
}
}
// Set the state of modules we didn't respond to with mw.loader.implement
if ( count( $states ) ) {
$stateScript = self::makeLoaderStateScript( $states );
if ( !$context->getDebug() ) {
$stateScript = self::filter( 'minify-js', $stateScript );
}
$out .= $stateScript;
}
} else {
if ( count( $states ) ) {
$this->errors[] = 'Problematic modules: ' .
FormatJson::encode( $states, ResourceLoader::inDebugMode() );
}
}
return $out;
}
/**
* Get names of modules that use a certain message.
*
* @param string $messageKey
* @return array List of module names
*/
public function getModulesByMessage( $messageKey ) {
$moduleNames = [];
foreach ( $this->getModuleNames() as $moduleName ) {
$module = $this->getModule( $moduleName );
if ( in_array( $messageKey, $module->getMessages() ) ) {
$moduleNames[] = $moduleName;
}
}
return $moduleNames;
}
/* Static Methods */
/**
* Return JS code that calls mw.loader.implement with given module properties.
*
* @param string $name Module name
* @param mixed $scripts List of URLs to JavaScript files or String of JavaScript code
* @param mixed $styles Array of CSS strings keyed by media type, or an array of lists of URLs
* to CSS files keyed by media type
* @param mixed $messages List of messages associated with this module. May either be an
* associative array mapping message key to value, or a JSON-encoded message blob containing
* the same data, wrapped in an XmlJsCode object.
* @param array $templates Keys are name of templates and values are the source of
* the template.
* @throws MWException
* @return string
*/
public static function makeLoaderImplementScript(
$name, $scripts, $styles, $messages, $templates
) {
if ( is_string( $scripts ) ) {
// Site and user module are a legacy scripts that run in the global scope (no closure).
// Transportation as string instructs mw.loader.implement to use globalEval.
if ( $name === 'site' || $name === 'user' ) {
// Minify manually because the general makeModuleResponse() minification won't be
// effective here due to the script being a string instead of a function. (T107377)
if ( !ResourceLoader::inDebugMode() ) {
$scripts = self::filter( 'minify-js', $scripts );
}
} else {
$scripts = new XmlJsCode( "function ( $, jQuery, require, module ) {\n{$scripts}\n}" );
}
} elseif ( !is_array( $scripts ) ) {
throw new MWException( 'Invalid scripts error. Array of URLs or string of code expected.' );
}
// mw.loader.implement requires 'styles', 'messages' and 'templates' to be objects (not
// arrays). json_encode considers empty arrays to be numerical and outputs "[]" instead
// of "{}". Force them to objects.
$module = [
$name,
$scripts,
(object)$styles,
(object)$messages,
(object)$templates,
];
self::trimArray( $module );
return Xml::encodeJsCall( 'mw.loader.implement', $module, ResourceLoader::inDebugMode() );
}
/**
* Returns JS code which, when called, will register a given list of messages.
*
* @param mixed $messages Either an associative array mapping message key to value, or a
* JSON-encoded message blob containing the same data, wrapped in an XmlJsCode object.
* @return string
*/
public static function makeMessageSetScript( $messages ) {
return Xml::encodeJsCall(
'mw.messages.set',
[ (object)$messages ],
ResourceLoader::inDebugMode()
);
}
/**
* Combines an associative array mapping media type to CSS into a
* single stylesheet with "@media" blocks.
*
* @param array $stylePairs Array keyed by media type containing (arrays of) CSS strings
* @return array
*/
public static function makeCombinedStyles( array $stylePairs ) {
$out = [];
foreach ( $stylePairs as $media => $styles ) {
// ResourceLoaderFileModule::getStyle can return the styles
// as a string or an array of strings. This is to allow separation in
// the front-end.
$styles = (array)$styles;
foreach ( $styles as $style ) {
$style = trim( $style );
// Don't output an empty "@media print { }" block (bug 40498)
if ( $style !== '' ) {
// Transform the media type based on request params and config
// The way that this relies on $wgRequest to propagate request params is slightly evil
$media = OutputPage::transformCssMedia( $media );
if ( $media === '' || $media == 'all' ) {
$out[] = $style;
} elseif ( is_string( $media ) ) {
$out[] = "@media $media {\n" . str_replace( "\n", "\n\t", "\t" . $style ) . "}";
}
// else: skip
}
}
}
return $out;
}
/**
* Returns a JS call to mw.loader.state, which sets the state of a
* module or modules to a given value. Has two calling conventions:
*
* - ResourceLoader::makeLoaderStateScript( $name, $state ):
* Set the state of a single module called $name to $state
*
* - ResourceLoader::makeLoaderStateScript( array( $name => $state, ... ) ):
* Set the state of modules with the given names to the given states
*
* @param string $name
* @param string $state
* @return string
*/
public static function makeLoaderStateScript( $name, $state = null ) {
if ( is_array( $name ) ) {
return Xml::encodeJsCall(
'mw.loader.state',
[ $name ],
ResourceLoader::inDebugMode()
);
} else {
return Xml::encodeJsCall(
'mw.loader.state',
[ $name, $state ],
ResourceLoader::inDebugMode()
);
}
}
/**
* Returns JS code which calls the script given by $script. The script will
* be called with local variables name, version, dependencies and group,
* which will have values corresponding to $name, $version, $dependencies
* and $group as supplied.
*
* @param string $name Module name
* @param string $version Module version hash
* @param array $dependencies List of module names on which this module depends
* @param string $group Group which the module is in.
* @param string $source Source of the module, or 'local' if not foreign.
* @param string $script JavaScript code
* @return string
*/
public static function makeCustomLoaderScript( $name, $version, $dependencies,
$group, $source, $script
) {
$script = str_replace( "\n", "\n\t", trim( $script ) );
return Xml::encodeJsCall(
"( function ( name, version, dependencies, group, source ) {\n\t$script\n} )",
[ $name, $version, $dependencies, $group, $source ],
ResourceLoader::inDebugMode()
);
}
private static function isEmptyObject( stdClass $obj ) {
foreach ( $obj as $key => $value ) {
return false;
}
return true;
}
/**
* Remove empty values from the end of an array.
*
* Values considered empty:
*
* - null
* - array()
* - new XmlJsCode( '{}' )
* - new stdClass() // (object) array()
*
* @param Array $array
*/
private static function trimArray( array &$array ) {
$i = count( $array );
while ( $i-- ) {
if ( $array[$i] === null
|| $array[$i] === []
|| ( $array[$i] instanceof XmlJsCode && $array[$i]->value === '{}' )
|| ( $array[$i] instanceof stdClass && self::isEmptyObject( $array[$i] ) )
) {
unset( $array[$i] );
} else {
break;
}
}
}
/**
* Returns JS code which calls mw.loader.register with the given
* parameters. Has three calling conventions:
*
* - ResourceLoader::makeLoaderRegisterScript( $name, $version,
* $dependencies, $group, $source, $skip
* ):
* Register a single module.
*
* - ResourceLoader::makeLoaderRegisterScript( array( $name1, $name2 ) ):
* Register modules with the given names.
*
* - ResourceLoader::makeLoaderRegisterScript( array(
* array( $name1, $version1, $dependencies1, $group1, $source1, $skip1 ),
* array( $name2, $version2, $dependencies1, $group2, $source2, $skip2 ),
* ...
* ) ):
* Registers modules with the given names and parameters.
*
* @param string $name Module name
* @param string $version Module version hash
* @param array $dependencies List of module names on which this module depends
* @param string $group Group which the module is in
* @param string $source Source of the module, or 'local' if not foreign
* @param string $skip Script body of the skip function
* @return string
*/
public static function makeLoaderRegisterScript( $name, $version = null,
$dependencies = null, $group = null, $source = null, $skip = null
) {
if ( is_array( $name ) ) {
// Build module name index
$index = [];
foreach ( $name as $i => &$module ) {
$index[$module[0]] = $i;
}
// Transform dependency names into indexes when possible, they will be resolved by
// mw.loader.register on the other end
foreach ( $name as &$module ) {
if ( isset( $module[2] ) ) {
foreach ( $module[2] as &$dependency ) {
if ( isset( $index[$dependency] ) ) {
$dependency = $index[$dependency];
}
}
}
}
array_walk( $name, [ 'self', 'trimArray' ] );
return Xml::encodeJsCall(
'mw.loader.register',
[ $name ],
ResourceLoader::inDebugMode()
);
} else {
$registration = [ $name, $version, $dependencies, $group, $source, $skip ];
self::trimArray( $registration );
return Xml::encodeJsCall(
'mw.loader.register',
$registration,
ResourceLoader::inDebugMode()
);
}
}
/**
* Returns JS code which calls mw.loader.addSource() with the given
* parameters. Has two calling conventions:
*
* - ResourceLoader::makeLoaderSourcesScript( $id, $properties ):
* Register a single source
*
* - ResourceLoader::makeLoaderSourcesScript( array( $id1 => $loadUrl, $id2 => $loadUrl, ... ) );
* Register sources with the given IDs and properties.
*
* @param string $id Source ID
* @param array $properties Source properties (see addSource())
* @return string
*/
public static function makeLoaderSourcesScript( $id, $properties = null ) {
if ( is_array( $id ) ) {
return Xml::encodeJsCall(
'mw.loader.addSource',
[ $id ],
ResourceLoader::inDebugMode()
);
} else {
return Xml::encodeJsCall(
'mw.loader.addSource',
[ $id, $properties ],
ResourceLoader::inDebugMode()
);
}
}
/**
* Returns JS code which runs given JS code if the client-side framework is
* present.
*
* @deprecated since 1.25; use makeInlineScript instead
* @param string $script JavaScript code
* @return string
*/
public static function makeLoaderConditionalScript( $script ) {
return '(window.RLQ=window.RLQ||[]).push(function(){' .
trim( $script ) . '});';
}
/**
* Construct an inline script tag with given JS code.
*
* The code will be wrapped in a closure, and it will be executed by ResourceLoader
* only if the client has adequate support for MediaWiki JavaScript code.
*
* @param string $script JavaScript code
* @return WrappedString HTML
*/
public static function makeInlineScript( $script ) {
$js = self::makeLoaderConditionalScript( $script );
return new WrappedString(
Html::inlineScript( $js ),
'<script>(window.RLQ=window.RLQ||[]).push(function(){',
'});</script>'
);
}
/**
* Returns JS code which will set the MediaWiki configuration array to
* the given value.
*
* @param array $configuration List of configuration values keyed by variable name
* @return string
*/
public static function makeConfigSetScript( array $configuration ) {
return Xml::encodeJsCall(
'mw.config.set',
[ $configuration ],
ResourceLoader::inDebugMode()
);
}
/**
* Convert an array of module names to a packed query string.
*
* For example, array( 'foo.bar', 'foo.baz', 'bar.baz', 'bar.quux' )
* becomes 'foo.bar,baz|bar.baz,quux'
* @param array $modules List of module names (strings)
* @return string Packed query string
*/
public static function makePackedModulesString( $modules ) {
$groups = []; // array( prefix => array( suffixes ) )
foreach ( $modules as $module ) {
$pos = strrpos( $module, '.' );
$prefix = $pos === false ? '' : substr( $module, 0, $pos );
$suffix = $pos === false ? $module : substr( $module, $pos + 1 );
$groups[$prefix][] = $suffix;
}
$arr = [];
foreach ( $groups as $prefix => $suffixes ) {
$p = $prefix === '' ? '' : $prefix . '.';
$arr[] = $p . implode( ',', $suffixes );
}
$str = implode( '|', $arr );
return $str;
}
/**
* Determine whether debug mode was requested
* Order of priority is 1) request param, 2) cookie, 3) $wg setting
* @return bool
*/
public static function inDebugMode() {
if ( self::$debugMode === null ) {
global $wgRequest, $wgResourceLoaderDebug;
self::$debugMode = $wgRequest->getFuzzyBool( 'debug',
$wgRequest->getCookie( 'resourceLoaderDebug', '', $wgResourceLoaderDebug )
);
}
return self::$debugMode;
}
/**
* Reset static members used for caching.
*
* Global state and $wgRequest are evil, but we're using it right
* now and sometimes we need to be able to force ResourceLoader to
* re-evaluate the context because it has changed (e.g. in the test suite).
*/
public static function clearCache() {
self::$debugMode = null;
}
/**
* Build a load.php URL
*
* @since 1.24
* @param string $source Name of the ResourceLoader source
* @param ResourceLoaderContext $context
* @param array $extraQuery
* @return string URL to load.php. May be protocol-relative if $wgLoadScript is, too.
*/
public function createLoaderURL( $source, ResourceLoaderContext $context,
$extraQuery = []
) {
$query = self::createLoaderQuery( $context, $extraQuery );
$script = $this->getLoadScript( $source );
return wfAppendQuery( $script, $query );
}
/**
* Build a load.php URL
* @deprecated since 1.24 Use createLoaderURL() instead
* @param array $modules Array of module names (strings)
* @param string $lang Language code
* @param string $skin Skin name
* @param string|null $user User name. If null, the &user= parameter is omitted
* @param string|null $version Versioning timestamp
* @param bool $debug Whether the request should be in debug mode
* @param string|null $only &only= parameter
* @param bool $printable Printable mode
* @param bool $handheld Handheld mode
* @param array $extraQuery Extra query parameters to add
* @return string URL to load.php. May be protocol-relative if $wgLoadScript is, too.
*/
public static function makeLoaderURL( $modules, $lang, $skin, $user = null,
$version = null, $debug = false, $only = null, $printable = false,
$handheld = false, $extraQuery = []
) {
global $wgLoadScript;
$query = self::makeLoaderQuery( $modules, $lang, $skin, $user, $version, $debug,
$only, $printable, $handheld, $extraQuery
);
return wfAppendQuery( $wgLoadScript, $query );
}
/**
* Helper for createLoaderURL()
*
* @since 1.24
* @see makeLoaderQuery
* @param ResourceLoaderContext $context
* @param array $extraQuery
* @return array
*/
public static function createLoaderQuery( ResourceLoaderContext $context, $extraQuery = [] ) {
return self::makeLoaderQuery(
$context->getModules(),
$context->getLanguage(),
$context->getSkin(),
$context->getUser(),
$context->getVersion(),
$context->getDebug(),
$context->getOnly(),
$context->getRequest()->getBool( 'printable' ),
$context->getRequest()->getBool( 'handheld' ),
$extraQuery
);
}
/**
* Build a query array (array representation of query string) for load.php. Helper
* function for makeLoaderURL().
*
* @param array $modules
* @param string $lang
* @param string $skin
* @param string $user
* @param string $version
* @param bool $debug
* @param string $only
* @param bool $printable
* @param bool $handheld
* @param array $extraQuery
*
* @return array
*/
public static function makeLoaderQuery( $modules, $lang, $skin, $user = null,
$version = null, $debug = false, $only = null, $printable = false,
$handheld = false, $extraQuery = []
) {
$query = [
'modules' => self::makePackedModulesString( $modules ),
'lang' => $lang,
'skin' => $skin,
'debug' => $debug ? 'true' : 'false',
];
if ( $user !== null ) {
$query['user'] = $user;
}
if ( $version !== null ) {
$query['version'] = $version;
}
if ( $only !== null ) {
$query['only'] = $only;
}
if ( $printable ) {
$query['printable'] = 1;
}
if ( $handheld ) {
$query['handheld'] = 1;
}
$query += $extraQuery;
// Make queries uniform in order
ksort( $query );
return $query;
}
/**
* Check a module name for validity.
*
* Module names may not contain pipes (|), commas (,) or exclamation marks (!) and can be
* at most 255 bytes.
*
* @param string $moduleName Module name to check
* @return bool Whether $moduleName is a valid module name
*/
public static function isValidModuleName( $moduleName ) {
return strcspn( $moduleName, '!,|', 0, 255 ) === strlen( $moduleName );
}
/**
* Returns LESS compiler set up for use with MediaWiki
*
* @since 1.27
* @param array $extraVars Associative array of extra (i.e., other than the
* globally-configured ones) that should be used for compilation.
* @throws MWException
* @return Less_Parser
*/
public function getLessCompiler( $extraVars = [] ) {
// When called from the installer, it is possible that a required PHP extension
// is missing (at least for now; see bug 47564). If this is the case, throw an
// exception (caught by the installer) to prevent a fatal error later on.
if ( !class_exists( 'Less_Parser' ) ) {
throw new MWException( 'MediaWiki requires the less.php parser' );
}
$parser = new Less_Parser;
$parser->ModifyVars( array_merge( $this->getLessVars(), $extraVars ) );
$parser->SetImportDirs(
array_fill_keys( $this->config->get( 'ResourceLoaderLESSImportPaths' ), '' )
);
$parser->SetOption( 'relativeUrls', false );
$parser->SetCacheDir( $this->config->get( 'CacheDirectory' ) ?: wfTempDir() );
return $parser;
}
/**
* Get global LESS variables.
*
* @since 1.27
* @return array Map of variable names to string CSS values.
*/
public function getLessVars() {
if ( !$this->lessVars ) {
$lessVars = $this->config->get( 'ResourceLoaderLESSVars' );
Hooks::run( 'ResourceLoaderGetLessVars', [ &$lessVars ] );
$this->lessVars = $lessVars;
}
return $this->lessVars;
}
}