483 lines
16 KiB
PHP
483 lines
16 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @author Roan Kattouw
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* @author Trevor Parscal
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*/
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defined( 'MEDIAWIKI' ) || die( 1 );
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/**
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* Dynamic JavaScript and CSS resource loading system.
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*
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* Most of the documention is on the MediaWiki documentation wiki starting at:
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* http://www.mediawiki.org/wiki/ResourceLoader
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*/
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class ResourceLoader {
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/* Protected Static Members */
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/** @var {array} List of module name/ResourceLoaderModule object pairs */
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protected $modules = array();
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/* Protected Methods */
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/**
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* Loads information stored in the database about modules.
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*
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* This method grabs modules dependencies from the database and updates modules objects.
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*
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* This is not inside the module code because it's so much more performant to request all of the information at once
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* than it is to have each module requests its own information. This sacrifice of modularity yields a profound
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* performance improvement.
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*
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* @param $modules Array: list of module names to preload information for
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* @param $context ResourceLoaderContext: context to load the information within
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*/
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protected function preloadModuleInfo( array $modules, ResourceLoaderContext $context ) {
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if ( !count( $modules ) ) {
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return; // or else Database*::select() will explode, plus it's cheaper!
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}
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$dbr = wfGetDb( DB_SLAVE );
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$skin = $context->getSkin();
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$lang = $context->getLanguage();
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// Get file dependency information
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$res = $dbr->select( 'module_deps', array( 'md_module', 'md_deps' ), array(
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'md_module' => $modules,
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'md_skin' => $context->getSkin()
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), __METHOD__
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);
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// Set modules' dependecies
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$modulesWithDeps = array();
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foreach ( $res as $row ) {
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$this->modules[$row->md_module]->setFileDependencies( $skin,
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FormatJson::decode( $row->md_deps, true )
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);
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$modulesWithDeps[] = $row->md_module;
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}
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// Register the absence of a dependency row too
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foreach ( array_diff( $modules, $modulesWithDeps ) as $name ) {
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$this->modules[$name]->setFileDependencies( $skin, array() );
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}
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// Get message blob mtimes. Only do this for modules with messages
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$modulesWithMessages = array();
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$modulesWithoutMessages = array();
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foreach ( $modules as $name ) {
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if ( count( $this->modules[$name]->getMessages() ) ) {
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$modulesWithMessages[] = $name;
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} else {
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$modulesWithoutMessages[] = $name;
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}
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}
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if ( count( $modulesWithMessages ) ) {
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$res = $dbr->select( 'msg_resource', array( 'mr_resource', 'mr_timestamp' ), array(
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'mr_resource' => $modulesWithMessages,
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'mr_lang' => $lang
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), __METHOD__
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);
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foreach ( $res as $row ) {
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$this->modules[$row->mr_resource]->setMsgBlobMtime( $lang, $row->mr_timestamp );
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}
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}
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foreach ( $modulesWithoutMessages as $name ) {
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$this->modules[$name]->setMsgBlobMtime( $lang, 0 );
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}
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}
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/**
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* Runs JavaScript or CSS data through a filter, caching the filtered result for future calls.
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*
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* Available filters are:
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* - minify-js \see JSMin::minify
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* - minify-css \see CSSMin::minify
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* - flip-css \see CSSJanus::transform
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*
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* If $data is empty, only contains whitespace or the filter was unknown, $data is returned unmodified.
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*
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* @param $filter String: name of filter to run
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* @param $data String: text to filter, such as JavaScript or CSS text
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* @return String: filtered data
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*/
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protected function filter( $filter, $data ) {
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global $wgMemc;
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wfProfileIn( __METHOD__ );
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// For empty/whitespace-only data or for unknown filters, don't perform any caching or processing
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if ( trim( $data ) === '' || !in_array( $filter, array( 'minify-js', 'minify-css', 'flip-css' ) ) ) {
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wfProfileOut( __METHOD__ );
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return $data;
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}
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// Try for Memcached hit
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$key = wfMemcKey( 'resourceloader', 'filter', $filter, md5( $data ) );
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if ( is_string( $cache = $wgMemc->get( $key ) ) ) {
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wfProfileOut( __METHOD__ );
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return $cache;
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}
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// Run the filter - we've already verified one of these will work
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try {
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switch ( $filter ) {
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case 'minify-js':
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$result = JSMin::minify( $data );
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break;
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case 'minify-css':
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$result = CSSMin::minify( $data );
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break;
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case 'flip-css':
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$result = CSSJanus::transform( $data, true, false );
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break;
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}
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} catch ( Exception $exception ) {
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throw new MWException( 'ResourceLoader filter error. Exception was thrown: ' . $exception->getMessage() );
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}
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// Save filtered text to Memcached
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$wgMemc->set( $key, $result );
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wfProfileOut( __METHOD__ );
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return $result;
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}
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/* Methods */
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/**
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* Registers core modules and runs registration hooks.
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*/
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public function __construct() {
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global $IP;
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wfProfileIn( __METHOD__ );
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// Register core modules
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$this->register( include( "$IP/resources/Resources.php" ) );
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// Register extension modules
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wfRunHooks( 'ResourceLoaderRegisterModules', array( &$this ) );
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wfProfileOut( __METHOD__ );
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}
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/**
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* Registers a module with the ResourceLoader system.
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*
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* @param $name Mixed: string of name of module or array of name/object pairs
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* @param $object ResourceLoaderModule: module object (optional when using multiple-registration calling style)
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* @throws MWException If a duplicate module registration is attempted
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* @throws MWException If something other than a ResourceLoaderModule is being registered
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* @return Boolean: false if there were any errors, in which case one or more modules were not registered
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*/
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public function register( $name, ResourceLoaderModule $object = null ) {
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wfProfileIn( __METHOD__ );
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// Allow multiple modules to be registered in one call
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if ( is_array( $name ) && !isset( $object ) ) {
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foreach ( $name as $key => $value ) {
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$this->register( $key, $value );
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}
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wfProfileOut( __METHOD__ );
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return;
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}
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// Disallow duplicate registrations
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if ( isset( $this->modules[$name] ) ) {
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// A module has already been registered by this name
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throw new MWException(
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'ResourceLoader duplicate registration error. Another module has already been registered as ' . $name
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);
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}
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// Validate the input (type hinting lets null through)
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if ( !( $object instanceof ResourceLoaderModule ) ) {
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throw new MWException( 'ResourceLoader invalid module error. Instances of ResourceLoaderModule expected.' );
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}
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// Attach module
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$this->modules[$name] = $object;
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$object->setName( $name );
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wfProfileOut( __METHOD__ );
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}
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/**
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* Gets a map of all modules and their options
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*
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* @return Array: array( modulename => ResourceLoaderModule )
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*/
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public function getModules() {
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return $this->modules;
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}
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/**
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* Get the ResourceLoaderModule object for a given module name.
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*
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* @param $name String: module name
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* @return Mixed: ResourceLoaderModule if module has been registered, null otherwise
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*/
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public function getModule( $name ) {
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return isset( $this->modules[$name] ) ? $this->modules[$name] : null;
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}
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/**
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* Outputs a response to a resource load-request, including a content-type header.
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*
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* @param $context ResourceLoaderContext: context in which a response should be formed
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*/
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public function respond( ResourceLoaderContext $context ) {
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global $wgResourceLoaderMaxage, $wgCacheEpoch;
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wfProfileIn( __METHOD__ );
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// Split requested modules into two groups, modules and missing
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$modules = array();
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$missing = array();
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foreach ( $context->getModules() as $name ) {
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if ( isset( $this->modules[$name] ) ) {
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$modules[$name] = $this->modules[$name];
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} else {
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$missing[] = $name;
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}
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}
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// If a version wasn't specified we need a shorter expiry time for updates to propagate to clients quickly
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if ( is_null( $context->getVersion() ) ) {
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$maxage = $wgResourceLoaderMaxage['unversioned']['client'];
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$smaxage = $wgResourceLoaderMaxage['unversioned']['server'];
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}
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// If a version was specified we can use a longer expiry time since changing version numbers causes cache misses
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else {
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$maxage = $wgResourceLoaderMaxage['versioned']['client'];
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$smaxage = $wgResourceLoaderMaxage['versioned']['server'];
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}
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// Preload information needed to the mtime calculation below
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$this->preloadModuleInfo( array_keys( $modules ), $context );
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wfProfileIn( __METHOD__.'-getModifiedTime' );
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// To send Last-Modified and support If-Modified-Since, we need to detect the last modified time
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$mtime = wfTimestamp( TS_UNIX, $wgCacheEpoch );
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foreach ( $modules as $module ) {
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// Bypass squid cache if the request includes any private modules
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if ( $module->getGroup() === 'private' ) {
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$smaxage = 0;
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}
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// Calculate maximum modified time
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$mtime = max( $mtime, $module->getModifiedTime( $context ) );
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}
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wfProfileOut( __METHOD__.'-getModifiedTime' );
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header( 'Content-Type: ' . ( $context->getOnly() === 'styles' ? 'text/css' : 'text/javascript' ) );
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header( 'Last-Modified: ' . wfTimestamp( TS_RFC2822, $mtime ) );
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header( "Cache-Control: public, max-age=$maxage, s-maxage=$smaxage" );
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header( 'Expires: ' . wfTimestamp( TS_RFC2822, min( $maxage, $smaxage ) + time() ) );
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// If there's an If-Modified-Since header, respond with a 304 appropriately
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$ims = $context->getRequest()->getHeader( 'If-Modified-Since' );
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if ( $ims !== false && $mtime <= wfTimestamp( TS_UNIX, $ims ) ) {
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header( 'HTTP/1.0 304 Not Modified' );
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header( 'Status: 304 Not Modified' );
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wfProfileOut( __METHOD__ );
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return;
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}
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// Generate a response
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$response = $this->makeModuleResponse( $context, $modules, $missing );
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// Tack on PHP warnings as a comment in debug mode
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if ( $context->getDebug() && strlen( $warnings = ob_get_contents() ) ) {
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$response .= "/*\n$warnings\n*/";
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}
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// Clear any warnings from the buffer
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ob_clean();
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echo $response;
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wfProfileOut( __METHOD__ );
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}
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/**
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* Generates code for a response
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*
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* @param $context ResourceLoaderContext: context in which to generate a response
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* @param $modules Array: list of module objects keyed by module name
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* @param $missing Array: list of unavailable modules (optional)
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* @return String: response data
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*/
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public function makeModuleResponse( ResourceLoaderContext $context, array $modules, $missing = array() ) {
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// Pre-fetch blobs
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$blobs = $context->shouldIncludeMessages() ?
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MessageBlobStore::get( $this, $modules, $context->getLanguage() ) : array();
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// Generate output
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$out = '';
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foreach ( $modules as $name => $module ) {
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wfProfileIn( __METHOD__ . '-' . $name );
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// Scripts
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$scripts = '';
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if ( $context->shouldIncludeScripts() ) {
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$scripts .= $module->getScript( $context ) . "\n";
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}
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// Styles
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$styles = array();
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if ( $context->shouldIncludeStyles() && ( count( $styles = $module->getStyles( $context ) ) ) ) {
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// Flip CSS on a per-module basis
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if ( $this->modules[$name]->getFlip( $context ) ) {
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foreach ( $styles as $media => $style ) {
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$styles[$media] = $this->filter( 'flip-css', $style );
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}
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}
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}
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// Messages
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$messages = isset( $blobs[$name] ) ? $blobs[$name] : '{}';
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// Append output
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switch ( $context->getOnly() ) {
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case 'scripts':
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$out .= $scripts;
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break;
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case 'styles':
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$out .= self::makeCombinedStyles( $styles );
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break;
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case 'messages':
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$out .= self::makeMessageSetScript( $messages );
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break;
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default:
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// Minify CSS before embedding in mediaWiki.loader.implement call (unless in debug mode)
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if ( !$context->getDebug() ) {
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foreach ( $styles as $media => $style ) {
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$styles[$media] = $this->filter( 'minify-css', $style );
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}
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}
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$out .= self::makeLoaderImplementScript( $name, $scripts, $styles, $messages );
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break;
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}
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wfProfileOut( __METHOD__ . '-' . $name );
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}
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// Update module states
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if ( $context->shouldIncludeScripts() ) {
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// Set the state of modules loaded as only scripts to ready
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if ( count( $modules ) && $context->getOnly() === 'scripts' && !isset( $modules['startup'] ) ) {
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$out .= self::makeLoaderStateScript( array_fill_keys( array_keys( $modules ), 'ready' ) );
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}
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// Set the state of modules which were requested but unavailable as missing
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if ( is_array( $missing ) && count( $missing ) ) {
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$out .= self::makeLoaderStateScript( array_fill_keys( $missing, 'missing' ) );
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}
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}
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if ( $context->getDebug() ) {
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return $out;
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} else {
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if ( $context->getOnly() === 'styles' ) {
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return $this->filter( 'minify-css', $out );
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} else {
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return $this->filter( 'minify-js', $out );
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}
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}
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}
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/* Static Methods */
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public static function makeLoaderImplementScript( $name, $scripts, $styles, $messages ) {
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if ( is_array( $scripts ) ) {
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$scripts = implode( $scripts, "\n" );
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}
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if ( is_array( $styles ) ) {
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$styles = count( $styles ) ? FormatJson::encode( $styles ) : 'null';
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}
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if ( is_array( $messages ) ) {
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$messages = count( $messages ) ? FormatJson::encode( $messages ) : 'null';
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}
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return "mediaWiki.loader.implement( '$name', function() {{$scripts}},\n$styles,\n$messages );\n";
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}
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public static function makeMessageSetScript( $messages ) {
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if ( is_array( $messages ) ) {
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$messages = count( $messages ) ? FormatJson::encode( $messages ) : 'null';
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}
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return "mediaWiki.msg.set( $messages );\n";
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}
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public static function makeCombinedStyles( array $styles ) {
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$out = '';
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foreach ( $styles as $media => $style ) {
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$out .= "@media $media {\n" . str_replace( "\n", "\n\t", "\t" . $style ) . "\n}\n";
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}
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return $out;
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}
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public static function makeLoaderStateScript( $name, $state = null ) {
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if ( is_array( $name ) ) {
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$statuses = FormatJson::encode( $name );
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return "mediaWiki.loader.state( $statuses );\n";
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} else {
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$name = Xml::escapeJsString( $name );
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$state = Xml::escapeJsString( $state );
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return "mediaWiki.loader.state( '$name', '$state' );\n";
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}
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}
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public static function makeCustomLoaderScript( $name, $version, $dependencies, $group, $script ) {
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$name = Xml::escapeJsString( $name );
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$version = (int) $version > 1 ? (int) $version : 1;
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$dependencies = FormatJson::encode( $dependencies );
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$group = FormatJson::encode( $group );
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$script = str_replace( "\n", "\n\t", trim( $script ) );
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return "( function( name, version, dependencies, group ) {\n\t$script\n} )" .
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"( '$name', $version, $dependencies, $group );\n";
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}
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public static function makeLoaderRegisterScript( $name, $version = null, $dependencies = null, $group = null ) {
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if ( is_array( $name ) ) {
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$registrations = FormatJson::encode( $name );
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return "mediaWiki.loader.register( $registrations );\n";
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} else {
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$name = Xml::escapeJsString( $name );
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$version = (int) $version > 1 ? (int) $version : 1;
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$dependencies = FormatJson::encode( $dependencies );
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$group = FormatJson::encode( $group );
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return "mediaWiki.loader.register( '$name', $version, $dependencies, $group );\n";
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}
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}
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public static function makeLoaderConditionalScript( $script ) {
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$script = str_replace( "\n", "\n\t", trim( $script ) );
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return "if ( window.mediaWiki ) {\n\t$script\n}\n";
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}
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public static function makeConfigSetScript( array $configuration ) {
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$configuration = FormatJson::encode( $configuration );
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return "mediaWiki.config.set( $configuration );\n";
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}
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}
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