Load ULS language list from a resource loader module

Having them in the page source of every page view is wasteful.

Bug: 41210
Change-Id: If15e297a4781cc49ded06fbc906529f57a22aafe

ResourceLoaderULSModule.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * Resource loader module for UniversalLanguageSelector
+ *
+ * Copyright (C) 2012 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris,
+ * Niklas Laxström, Pau Giner, Santhosh Thottingal, Siebrand Mazeland and other
+ * contributors. See CREDITS for a list.
+ *
+ * UniversalLanguageSelector is dual licensed GPLv2 or later and MIT. You don't
+ * have to do anything special to choose one license or the other and you don't
+ * have to notify anyone which license you are using. You are free to use
+ * UniversalLanguageSelector in commercial projects as long as the copyright
+ * header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
+ *
+ * @file
+ * @author Niklas Laxström
+ * @ingroup Extensions
+ * @licence GNU General Public Licence 2.0 or later
+ * @licence MIT License
+ */
+
+/**
+ * Resource loader module for providing MediaWiki language names.
+ */
+class ResourceLoaderULSModule extends ResourceLoaderModule {
+	protected $language;
+	protected $targets = array( 'desktop', 'mobile' );
+
+	/**
+	 * Get all the dynamic data for the content language to an array
+	 *
+	 * @return array
+	 */
+	protected function getData() {
+		$vars = array();
+		$vars['wgULSLanguages'] = Language::fetchLanguageNames(
+			$this->language->getCode(), 'mwfile'
+		);
+		return $vars;
+	}
+
+	/**
+	 * @param $context ResourceLoaderContext
+	 * @return string: JavaScript code
+	 */
+	public function getScript( ResourceLoaderContext $context ) {
+		$this->language = Language::factory( $context->getLanguage() );
+		$out = '';
+		foreach ( $this->getData() as $key => $value ) {
+			$out .= Xml::encodeJsCall( 'mw.config.set', array( $key, $value ) );
+		}
+		return $out;
+	}
+
+	/**
+	 * @param $context ResourceLoaderContext
+	 * @return array|int|Mixed
+	 */
+	public function getModifiedTime( ResourceLoaderContext $context ) {
+		$this->language = Language::factory( $context->getLanguage() );
+		$cache = wfGetCache( CACHE_ANYTHING );
+		$key = wfMemcKey( 'resourceloader', 'ulsmodule', 'changeinfo' );
+
+		$data = $this->getData();
+		$hash = md5( serialize( $data ) );
+
+		$result = $cache->get( $key );
+		if ( is_array( $result ) && $result['hash'] === $hash ) {
+			return $result['timestamp'];
+		}
+		$timestamp = wfTimestamp();
+		$cache->set( $key, array(
+			'hash' => $hash,
+			'timestamp' => $timestamp,
+		) );
+		return $timestamp;
+	}
+}

Resources.php

@@ -11,6 +11,10 @@ $resourcePaths = array(
 	'remoteExtPath' => 'UniversalLanguageSelector'
 );
 
+$wgResourceModules['ext.uls.languagenames'] = array(
+	'class' => 'ResourceLoaderULSModule'
+);
+
 $wgResourceModules['ext.uls.displaysettings'] = array(
 	'scripts' => 'resources/js/ext.uls.displaysettings.js',
 	'styles' => 'resources/css/ext.uls.displaysettings.css',
@@ -41,6 +45,7 @@ $wgResourceModules['ext.uls.init'] = array(
 		'monobook' => 'resources/css/ext.uls-monobook.css',
 	),
 	'dependencies' => array(
+		'ext.uls.languagenames',
 		'mediawiki.Uri',
 		'mediawiki.util',
 		'jquery.json',

UniversalLanguageSelector.hooks.php

@@ -281,9 +281,6 @@ class UniversalLanguageSelectorHooks {
 	 */
 	public static function addVariables( &$vars, OutputPage $out ) {
 		// Place request context dependent stuff here
-		$vars['wgULSLanguages'] = Language::fetchLanguageNames(
-			$out->getLanguage()->getCode(), 'mwfile'
-		);
 		$vars['wgULSAcceptLanguageList'] = array_keys( $out->getRequest()->getAcceptLang() );
 
 		return true;

UniversalLanguageSelector.php

@@ -123,6 +123,7 @@ $wgExtensionMessagesFiles['UniversalLanguageSelector'] = "$dir/UniversalLanguage
 
 // Register auto load for the page class
 $wgAutoloadClasses['UniversalLanguageSelectorHooks'] = "$dir/UniversalLanguageSelector.hooks.php";
+$wgAutoloadClasses['ResourceLoaderULSModule'] = "$dir/ResourceLoaderULSModule.php";
 $wgAutoloadClasses['ApiLanguageSearch'] = "$dir/api/ApiLanguageSearch.php";
 $wgAutoloadClasses['LanguageNameSearch'] = "$dir/data/LanguageNameSearch.php";